procps/proc/slabinfo.c

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/*
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* slabinfo.c - slabinfo related functions for libproc
*
* Chris Rivera <cmrivera@ufl.edu>
* Robert Love <rml@tech9.net>
*
* Copyright (C) 2003 Chris Rivera
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* Copyright (C) 2004 Albert Cahalan
* Copyright (C) 2015 Craig Small <csmall@enc.com.au>
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* Copyright (C) 2016 Jim Warnerl <james.warner@comcast.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
2004-07-19 10:26:10 +05:30
#include <ctype.h>
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#include <errno.h>
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
#include <time.h>
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
#include <unistd.h>
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#include <sys/stat.h>
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
#include <sys/types.h>
#include <proc/procps-private.h>
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
#include <proc/slabinfo.h>
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#define SLABINFO_FILE "/proc/slabinfo"
#define SLABINFO_LINE_LEN 2048
#define SLAB_INFO_NAME_LEN 128
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#define STACKS_INCR 128
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
/*
Because 'select' could, at most, return only node[0] values and since 'reap' |
would be forced to duplicate global slabs stuff in every node results stack, |
the following #define can be used to enforce strictly logical return values. |
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
select: allow only PROCPS_SLABINFO & PROCPS_SLABS items
reap: allow only PROCPS_SLABINFO & PROCPS_SLABNODE items
Without the #define, these functions always return something even if just 0. |
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
get: return only PROCPS_SLABS results, else 0
select: return only PROCPS_SLABINFO & PROCPS_SLABS results, else zero
reap: return any requested, even when duplicated in each node's stack */
//#define ENFORCE_LOGICAL // ensure only logical items accepted by select/reap
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_summ {
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
unsigned int nr_objs; /* number of objects, among all caches */
unsigned int nr_active_objs; /* number of active objects, among all caches */
unsigned int nr_pages; /* number of pages consumed by all objects */
unsigned int nr_slabs; /* number of slabs, among all caches */
unsigned int nr_active_slabs; /* number of active slabs, among all caches */
unsigned int nr_caches; /* number of caches */
unsigned int nr_active_caches; /* number of active caches */
unsigned int avg_obj_size; /* average object size */
unsigned int min_obj_size; /* size of smallest object */
unsigned int max_obj_size; /* size of largest object */
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
unsigned long active_size; /* size of all active objects */
unsigned long total_size; /* size of all objects */
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
};
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_node {
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
char name[SLAB_INFO_NAME_LEN]; /* name of this cache */
unsigned long cache_size; /* size of entire cache */
unsigned int nr_objs; /* number of objects in this cache */
unsigned int nr_active_objs; /* number of active objects */
unsigned int obj_size; /* size of each object */
unsigned int objs_per_slab; /* number of objects per slab */
unsigned int pages_per_slab; /* number of pages per slab */
unsigned int nr_slabs; /* number of slabs in this cache */
unsigned int nr_active_slabs; /* number of active slabs */
unsigned int use; /* percent full: total / active */
2015-07-04 10:29:59 +05:30
};
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_hist {
struct slabs_summ new;
struct slabs_summ old;
};
struct stacks_extent {
int ext_numstacks;
struct stacks_extent *next;
struct slabinfo_stack **stacks;
};
struct ext_support {
int numitems; // includes 'logical_end' delimiter
enum slabinfo_item *items; // includes 'logical_end' delimiter
struct stacks_extent *extents; // anchor for these extents
#ifdef ENFORCE_LOGICAL
enum slabinfo_item lowest; // range of allowable enums
enum slabinfo_item highest;
#endif
int dirty_stacks;
};
struct fetch_support {
struct slabinfo_stack **anchor; // fetch consolidated extents
int n_alloc; // number of above pointers allocated
int n_inuse; // number of above pointers occupied
int n_alloc_save; // last known reap.stacks allocation
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabinfo_reap results; // count + stacks for return to caller
};
struct slabinfo_info {
2015-07-04 10:29:59 +05:30
int refcount;
FILE *slabinfo_fp;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
int slabinfo_was_read;
int nodes_alloc; /* nodes alloc()ed */
int nodes_used; /* nodes using alloced memory */
struct slabs_node *nodes; /* first slabnode of this list */
struct slabs_hist hist; /* new/old slabs_summ data */
struct ext_support select_ext; /* supports concurrent select/reap */
struct ext_support fetch_ext; /* supports concurrent select/reap */
struct fetch_support fetch; /* support for procps_slabinfo_reap */
struct slabs_node nul_node; /* used by slabinfo_get/select */
struct slabinfo_result get_this; /* used by slabinfo_get */
};
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// ___ Results 'Set' Support ||||||||||||||||||||||||||||||||||||||||||||||||||
#define setNAME(e) set_results_ ## e
#define setDECL(e) static void setNAME(e) \
(struct slabinfo_result *R, struct slabs_hist *S, struct slabs_node *N)
// regular assignment
#define REG_set(e,t,x) setDECL(e) { (void)N; R->result. t = S->new . x; }
#define NOD_set(e,t,x) setDECL(e) { (void)S; R->result. t = N-> x; }
// delta assignment
#define HST_set(e,t,x) setDECL(e) { (void)N; R->result. t = (signed long)S->new . x - S->old. x; }
setDECL(noop) { (void)R; (void)S; (void)N; }
setDECL(extra) { (void)R; (void)S; (void)N; }
REG_set(SLABS_OBJS, u_int, nr_objs)
REG_set(SLABS_AOBJS, u_int, nr_active_objs)
REG_set(SLABS_PAGES, u_int, nr_pages)
REG_set(SLABS_SLABS, u_int, nr_slabs)
REG_set(SLABS_ASLABS, u_int, nr_active_slabs)
REG_set(SLABS_CACHES, u_int, nr_caches)
REG_set(SLABS_ACACHES, u_int, nr_active_caches)
REG_set(SLABS_SIZE_AVG, u_int, avg_obj_size)
REG_set(SLABS_SIZE_MIN, u_int, min_obj_size)
REG_set(SLABS_SIZE_MAX, u_int, max_obj_size)
REG_set(SLABS_SIZE_ACTIVE, ul_int, active_size)
REG_set(SLABS_SIZE_TOTAL, ul_int, total_size)
HST_set(SLABS_DELTA_OBJS, s_int, nr_objs)
HST_set(SLABS_DELTA_AOBJS, s_int, nr_active_objs)
HST_set(SLABS_DELTA_PAGES, s_int, nr_pages)
HST_set(SLABS_DELTA_SLABS, s_int, nr_slabs)
HST_set(SLABS_DELTA_ASLABS, s_int, nr_active_slabs)
HST_set(SLABS_DELTA_CACHES, s_int, nr_caches)
HST_set(SLABS_DELTA_ACACHES, s_int, nr_active_caches)
HST_set(SLABS_DELTA_SIZE_AVG, s_int, avg_obj_size)
HST_set(SLABS_DELTA_SIZE_MIN, s_int, min_obj_size)
HST_set(SLABS_DELTA_SIZE_MAX, s_int, max_obj_size)
HST_set(SLABS_DELTA_SIZE_ACTIVE, s_int, active_size)
HST_set(SLABS_DELTA_SIZE_TOTAL, s_int, total_size)
NOD_set(SLABNODE_NAME, str, name)
NOD_set(SLABNODE_OBJS, u_int, nr_objs)
NOD_set(SLABNODE_AOBJS, u_int, nr_active_objs)
NOD_set(SLABNODE_OBJ_SIZE, u_int, obj_size)
NOD_set(SLABNODE_OBJS_PER_SLAB, u_int, objs_per_slab)
NOD_set(SLABNODE_PAGES_PER_SLAB, u_int, pages_per_slab)
NOD_set(SLABNODE_SLABS, u_int, nr_slabs)
NOD_set(SLABNODE_ASLABS, u_int, nr_active_slabs)
NOD_set(SLABNODE_USE, u_int, use)
NOD_set(SLABNODE_SIZE, ul_int, cache_size)
#undef setDECL
#undef REG_set
#undef NOD_set
#undef HST_set
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// ___ Sorting Support ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
struct sort_parms {
int offset;
enum slabinfo_sort_order order;
2015-07-04 10:29:59 +05:30
};
#define srtNAME(t) sort_results_ ## t
#define srtDECL(t) static int srtNAME(t) \
(const struct slabinfo_stack **A, const struct slabinfo_stack **B, struct sort_parms *P)
srtDECL(u_int) {
const struct slabinfo_result *a = (*A)->head + P->offset; \
const struct slabinfo_result *b = (*B)->head + P->offset; \
if ( a->result.u_int > b->result.u_int ) return P->order > 0 ? 1 : -1; \
if ( a->result.u_int < b->result.u_int ) return P->order > 0 ? -1 : 1; \
return 0;
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
srtDECL(ul_int) {
const struct slabinfo_result *a = (*A)->head + P->offset; \
const struct slabinfo_result *b = (*B)->head + P->offset; \
if ( a->result.ul_int > b->result.ul_int ) return P->order > 0 ? 1 : -1; \
if ( a->result.ul_int < b->result.ul_int ) return P->order > 0 ? -1 : 1; \
return 0;
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
srtDECL(str) {
const struct slabinfo_result *a = (*A)->head + P->offset;
const struct slabinfo_result *b = (*B)->head + P->offset;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return P->order * strcoll(a->result.str, b->result.str);
}
srtDECL(noop) { \
(void)A; (void)B; (void)P; \
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return 0;
}
#undef srtDECL
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct slabinfo_result *, struct slabs_hist *, struct slabs_node *);
#define RS(e) (SET_t)setNAME(e)
typedef int (*QSR_t)(const void *, const void *, void *);
#define QS(t) (QSR_t)srtNAME(t)
/*
* Need it be said?
* This table must be kept in the exact same order as
* those *enum slabinfo_item* guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
QSR_t sortfunc; // sort cmp func for a specific type
} Item_table[] = {
/* setsfunc sortfunc
--------------------------- --------- */
{ RS(noop), QS(ul_int) },
{ RS(extra), QS(noop) },
{ RS(SLABS_OBJS), QS(noop) },
{ RS(SLABS_AOBJS), QS(noop) },
{ RS(SLABS_PAGES), QS(noop) },
{ RS(SLABS_SLABS), QS(noop) },
{ RS(SLABS_ASLABS), QS(noop) },
{ RS(SLABS_CACHES), QS(noop) },
{ RS(SLABS_ACACHES), QS(noop) },
{ RS(SLABS_SIZE_AVG), QS(noop) },
{ RS(SLABS_SIZE_MIN), QS(noop) },
{ RS(SLABS_SIZE_MAX), QS(noop) },
{ RS(SLABS_SIZE_ACTIVE), QS(noop) },
{ RS(SLABS_SIZE_TOTAL), QS(noop) },
{ RS(SLABS_DELTA_OBJS), QS(noop) },
{ RS(SLABS_DELTA_AOBJS), QS(noop) },
{ RS(SLABS_DELTA_PAGES), QS(noop) },
{ RS(SLABS_DELTA_SLABS), QS(noop) },
{ RS(SLABS_DELTA_ASLABS), QS(noop) },
{ RS(SLABS_DELTA_CACHES), QS(noop) },
{ RS(SLABS_DELTA_ACACHES), QS(noop) },
{ RS(SLABS_DELTA_SIZE_AVG), QS(noop) },
{ RS(SLABS_DELTA_SIZE_MIN), QS(noop) },
{ RS(SLABS_DELTA_SIZE_MAX), QS(noop) },
{ RS(SLABS_DELTA_SIZE_ACTIVE), QS(noop) },
{ RS(SLABS_DELTA_SIZE_TOTAL), QS(noop) },
{ RS(SLABNODE_NAME), QS(str) },
{ RS(SLABNODE_OBJS), QS(u_int) },
{ RS(SLABNODE_AOBJS), QS(u_int) },
{ RS(SLABNODE_OBJ_SIZE), QS(u_int) },
{ RS(SLABNODE_OBJS_PER_SLAB), QS(u_int) },
{ RS(SLABNODE_PAGES_PER_SLAB), QS(u_int) },
{ RS(SLABNODE_SLABS), QS(u_int) },
{ RS(SLABNODE_ASLABS), QS(u_int) },
{ RS(SLABNODE_USE), QS(u_int) },
{ RS(SLABNODE_SIZE), QS(ul_int) },
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// dummy entry corresponding to PROCPS_SLABINFO_logical_end ...
{ NULL, NULL }
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
};
/* please note,
* this enum MUST be 1 greater than the highest value of any enum */
enum slabinfo_item PROCPS_SLABINFO_logical_end = PROCPS_SLABNODE_SIZE + 1;
#undef setNAME
#undef srtNAME
#undef RS
#undef QS
// ___ Private Functions ||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- slabnode specific support ----------------------------------------------
2015-07-04 10:29:59 +05:30
/* Alloc up more slabnode memory, if required
*/
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static int alloc_slabnodes (
struct slabinfo_info *info)
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_node *new_nodes;
2015-07-04 10:29:59 +05:30
int new_count;
if (info->nodes_used < info->nodes_alloc)
return 0;
/* Increment the allocated number of slabs */
new_count = info->nodes_alloc * 5/4+30;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
new_nodes = realloc(info->nodes, sizeof(struct slabs_node) * new_count);
if (!new_nodes)
2015-07-04 10:29:59 +05:30
return -ENOMEM;
info->nodes = new_nodes;
info->nodes_alloc = new_count;
return 0;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: alloc_slabnodes
/*
2015-07-04 10:29:59 +05:30
* get_slabnode - allocate slab_info structures using a free list
*
* In the fast path, we simply return a node off the free list. In the slow
* list, we malloc() a new node. The free list is never automatically reaped,
* both for simplicity and because the number of slab caches is fairly
* constant.
*/
static int get_slabnode (
struct slabinfo_info *info,
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_node **node)
{
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int retval;
2015-07-04 10:29:59 +05:30
if (info->nodes_used == info->nodes_alloc) {
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if ((retval = alloc_slabnodes(info)) < 0)
2015-07-04 10:29:59 +05:30
return retval;
}
*node = &(info->nodes[info->nodes_used++]);
return 0;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: get_slabnode
2015-07-04 10:29:59 +05:30
/* parse_slabinfo20:
*
* sactual parse routine for slabinfo 2.x (2.6 kernels)
* Note: difference between 2.0 and 2.1 is in the ": globalstat" part where version 2.1
* has extra column <nodeallocs>. We don't use ": globalstat" part in both versions.
*
* Formats (we don't use "statistics" extensions)
*
* slabinfo - version: 2.1
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail>
*
* slabinfo - version: 2.1 (statistics)
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail> \
* : globalstat <listallocs> <maxobjs> <grown> <reaped> <error> <maxfreeable> <freelimit> <nodeallocs> \
* : cpustat <allochit> <allocmiss> <freehit> <freemiss>
*
* slabinfo - version: 2.0
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail>
*
* slabinfo - version: 2.0 (statistics)
* # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> \
* : tunables <batchcount> <limit> <sharedfactor> \
* : slabdata <active_slabs> <num_slabs> <sharedavail> \
* : globalstat <listallocs> <maxobjs> <grown> <reaped> <error> <maxfreeable> <freelimit> \
* : cpustat <allochit> <allocmiss> <freehit> <freemiss>
*/
static int parse_slabinfo20 (
struct slabinfo_info *info)
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_node *node;
2015-07-04 10:29:59 +05:30
char buffer[SLABINFO_LINE_LEN];
int retval;
int page_size = getpagesize();
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabs_summ *hist = &(info->hist.new);
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
hist->min_obj_size = INT_MAX;
hist->max_obj_size = 0;
2015-07-04 10:29:59 +05:30
while (fgets(buffer, SLABINFO_LINE_LEN, info->slabinfo_fp )) {
if (buffer[0] == '#')
continue;
if ((retval = get_slabnode(info, &node)) < 0)
return retval;
if (sscanf(buffer,
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
"%" STRINGIFY(SLAB_INFO_NAME_LEN) "s" \
"%u %u %u %u %u : tunables %*u %*u %*u : slabdata %u %u %*u",
node->name,
2015-07-04 10:29:59 +05:30
&node->nr_active_objs, &node->nr_objs,
&node->obj_size, &node->objs_per_slab,
&node->pages_per_slab, &node->nr_active_slabs,
&node->nr_slabs) < 8) {
if (errno != 0)
return -errno;
return -EINVAL;
}
if (!node->name[0])
snprintf(node->name, sizeof(node->name), "%s", "unknown");
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (node->obj_size < hist->min_obj_size)
hist->min_obj_size = node->obj_size;
if (node->obj_size > hist->max_obj_size)
hist->max_obj_size = node->obj_size;
2015-07-04 10:29:59 +05:30
node->cache_size = (unsigned long)node->nr_slabs * node->pages_per_slab
* page_size;
if (node->nr_objs) {
node->use = (unsigned int)100 * (node->nr_active_objs / node->nr_objs);
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
hist->nr_active_caches++;
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} else
node->use = 0;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
hist->nr_objs += node->nr_objs;
hist->nr_active_objs += node->nr_active_objs;
hist->total_size += (unsigned long)node->nr_objs * node->obj_size;
hist->active_size += (unsigned long)node->nr_active_objs * node->obj_size;
hist->nr_pages += node->nr_slabs * node->pages_per_slab;
hist->nr_slabs += node->nr_slabs;
hist->nr_active_slabs += node->nr_active_slabs;
hist->nr_caches++;
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}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (hist->nr_objs)
hist->avg_obj_size = hist->total_size / hist->nr_objs;
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return 0;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: parse_slabinfo20
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
/* read_slabinfo_failed():
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*
* Read the data out of /proc/slabinfo putting the information
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
* into the supplied info container
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*
* Returns: 0 on success, negative on error
*/
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static int read_slabinfo_failed (
struct slabinfo_info *info)
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{
char line[SLABINFO_LINE_LEN];
int retval, major, minor;
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library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
memcpy(&info->hist.old, &info->hist.new, sizeof(struct slabs_summ));
memset(&(info->hist.new), 0, sizeof(struct slabs_summ));
if ((retval = alloc_slabnodes(info)) < 0)
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return retval;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
memset(info->nodes, 0, sizeof(struct slabs_node)*info->nodes_alloc);
info->nodes_used = 0;
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library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (NULL == info->slabinfo_fp
&& (info->slabinfo_fp = fopen(SLABINFO_FILE, "r")) == NULL)
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return -errno;
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if (fseek(info->slabinfo_fp, 0L, SEEK_SET) < 0)
return -errno;
/* Parse the version string */
if (!fgets(line, SLABINFO_LINE_LEN, info->slabinfo_fp))
return -errno;
if (sscanf(line, "slabinfo - version: %d.%d", &major, &minor) != 2)
return -EINVAL;
if (major == 2)
retval = parse_slabinfo20(info);
else
return -ERANGE;
if (!info->slabinfo_was_read) {
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
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memcpy(&info->hist.old, &info->hist.new, sizeof(struct slabs_summ));
info->slabinfo_was_read = 1;
}
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return retval;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: read_slabinfo_failed
2015-07-04 10:29:59 +05:30
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// ___ Private Functions ||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- generalized support ----------------------------------------------------
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static inline void assign_results (
struct slabinfo_stack *stack,
struct slabs_hist *summ,
struct slabs_node *node)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabinfo_result *this = stack->head;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
for (;;) {
enum slabinfo_item item = this->item;
if (item >= PROCPS_SLABINFO_logical_end)
break;
Item_table[item].setsfunc(this, summ, node);
++this;
2015-07-04 10:29:59 +05:30
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return;
} // end: assign_results
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static inline void cleanup_stack (
struct slabinfo_result *this)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
for (;;) {
if (this->item >= PROCPS_SLABINFO_logical_end)
break;
if (this->item > PROCPS_SLABINFO_noop)
this->result.ul_int = 0;
++this;
}
} // end: cleanup_stack
static inline void cleanup_stacks_all (
struct ext_support *this)
{
struct stacks_extent *ext = this->extents;
int i;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
while (ext) {
for (i = 0; ext->stacks[i]; i++)
cleanup_stack(ext->stacks[i]->head);
ext = ext->next;
};
this->dirty_stacks = 0;
} // end: cleanup_stacks_all
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static void extents_free_all (
struct ext_support *this)
{
while (this->extents) {
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct stacks_extent *p = this->extents;
this->extents = this->extents->next;
free(p);
};
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: extents_free_all
static inline struct slabinfo_result *itemize_stack (
struct slabinfo_result *p,
int depth,
enum slabinfo_item *items)
{
struct slabinfo_result *p_sav = p;
int i;
for (i = 0; i < depth; i++) {
p->item = items[i];
p->result.ul_int = 0;
++p;
2015-07-04 10:29:59 +05:30
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return p_sav;
} // end: itemize_stack
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static void itemize_stacks_all (
struct ext_support *this)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct stacks_extent *ext = this->extents;
while (ext) {
int i;
for (i = 0; ext->stacks[i]; i++)
itemize_stack(ext->stacks[i]->head, this->numitems, this->items);
ext = ext->next;
};
this->dirty_stacks = 0;
} // end: static void itemize_stacks_all
static inline int items_check_failed (
struct ext_support *this,
enum slabinfo_item *items,
int numitems)
{
int i;
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
/* if an enum is passed instead of an address of one or more enums, ol' gcc
* will silently convert it to an address (possibly NULL). only clang will
* offer any sort of warning like the following:
*
* warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'enum slabinfo_item *'
* my_stack = procps_slabinfo_select(info, PROCPS_SLABINFO_noop, num);
* ^~~~~~~~~~~~~~~~
*/
if (numitems < 1
|| (void *)items < (void *)(unsigned long)(2 * PROCPS_SLABINFO_logical_end))
return -1;
for (i = 0; i < numitems; i++) {
#ifdef ENFORCE_LOGICAL
if (items[i] == PROCPS_SLABINFO_noop
|| (items[i] == PROCPS_SLABINFO_extra))
continue;
if (items[i] < this->lowest
|| (items[i] > this->highest))
return -1;
#else
// a slabinfo_item is currently unsigned, but we'll protect our future
if (items[i] < 0)
return -1;
if (items[i] >= PROCPS_SLABINFO_logical_end)
return -1;
#endif
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return 0;
} // end: items_check_failed
static struct stacks_extent *stacks_alloc (
struct ext_support *this,
int maxstacks)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct stacks_extent *p_blob;
struct slabinfo_stack **p_vect;
struct slabinfo_stack *p_head;
size_t vect_size, head_size, list_size, blob_size;
void *v_head, *v_list;
int i;
if (this == NULL || this->items == NULL)
2015-07-04 10:29:59 +05:30
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (maxstacks < 1)
2015-07-04 10:29:59 +05:30
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
vect_size = sizeof(void *) * maxstacks; // size of the addr vectors |
vect_size += sizeof(void *); // plus NULL addr delimiter |
head_size = sizeof(struct slabinfo_stack); // size of that head struct |
list_size = sizeof(struct slabinfo_result)*this->numitems;// any single results stack |
blob_size = sizeof(struct stacks_extent); // the extent anchor itself |
blob_size += vect_size; // plus room for addr vects |
blob_size += head_size * maxstacks; // plus room for head thing |
blob_size += list_size * maxstacks; // plus room for our stacks |
/* note: all of our memory is allocated in a single blob, facilitating a later free(). |
as a minimum, it is important that the result structures themselves always be |
contiguous for every stack since they are accessed through relative position. | */
if (NULL == (p_blob = calloc(1, blob_size)))
return NULL;
p_blob->next = this->extents; // push this extent onto... |
this->extents = p_blob; // ...some existing extents |
p_vect = (void *)p_blob + sizeof(struct stacks_extent); // prime our vector pointer |
p_blob->stacks = p_vect; // set actual vectors start |
v_head = (void *)p_vect + vect_size; // prime head pointer start |
v_list = v_head + (head_size * maxstacks); // prime our stacks pointer |
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
for (i = 0; i < maxstacks; i++) {
p_head = (struct slabinfo_stack *)v_head;
p_head->head = itemize_stack((struct slabinfo_result *)v_list, this->numitems, this->items);
p_blob->stacks[i] = p_head;
v_list += list_size;
v_head += head_size;
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
p_blob->ext_numstacks = maxstacks;
return p_blob;
} // end: stacks_alloc
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static int stacks_fetch (
struct slabinfo_info *info)
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
{
#define n_alloc info->fetch.n_alloc
#define n_inuse info->fetch.n_inuse
#define n_saved info->fetch.n_alloc_save
struct stacks_extent *ext;
// initialize stuff -----------------------------------
if (!info->fetch.anchor) {
if (!(info->fetch.anchor = calloc(sizeof(void *), STACKS_INCR)))
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return -ENOMEM;
n_alloc = STACKS_INCR;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
}
if (!info->fetch_ext.extents) {
if (!(ext = stacks_alloc(&info->fetch_ext, n_alloc)))
return -ENOMEM;
memset(info->fetch.anchor, 0, sizeof(void *) * n_alloc);
memcpy(info->fetch.anchor, ext->stacks, sizeof(void *) * n_alloc);
itemize_stacks_all(&info->fetch_ext);
}
cleanup_stacks_all(&info->fetch_ext);
// iterate stuff --------------------------------------
n_inuse = 0;
while (n_inuse < info->nodes_used) {
if (!(n_inuse < n_alloc)) {
n_alloc += STACKS_INCR;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if ((!(info->fetch.anchor = realloc(info->fetch.anchor, sizeof(void *) * n_alloc)))
|| (!(ext = stacks_alloc(&info->fetch_ext, STACKS_INCR))))
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return -1;
memcpy(info->fetch.anchor + n_inuse, ext->stacks, sizeof(void *) * STACKS_INCR);
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
assign_results(info->fetch.anchor[n_inuse], &info->hist, &info->nodes[n_inuse]);
++n_inuse;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
}
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// finalize stuff -------------------------------------
/* note: we go to this trouble of maintaining a duplicate of the consolidated |
extent stacks addresses represented as our 'anchor' since these ptrs |
are exposed to a user (um, not that we don't trust 'em or anything). |
plus, we can NULL delimit these ptrs which we couldn't do otherwise. | */
if (n_saved < n_inuse + 1) {
n_saved = n_inuse + 1;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (!(info->fetch.results.stacks = realloc(info->fetch.results.stacks, sizeof(void *) * n_saved)))
return -ENOMEM;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
}
memcpy(info->fetch.results.stacks, info->fetch.anchor, sizeof(void *) * n_inuse);
info->fetch.results.stacks[n_inuse] = NULL;
info->fetch.results.total = n_inuse;
return n_inuse;
#undef n_alloc
#undef n_inuse
#undef n_saved
} // end: stacks_fetch
static int stacks_reconfig_maybe (
struct ext_support *this,
enum slabinfo_item *items,
int numitems)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (items_check_failed(this, items, numitems))
return -EINVAL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
/* is this the first time or have things changed since we were last called?
if so, gotta' redo all of our stacks stuff ... */
if (this->numitems != numitems + 1
|| memcmp(this->items, items, sizeof(enum slabinfo_item) * numitems)) {
// allow for our PROCPS_SLABINFO_logical_end
if (!(this->items = realloc(this->items, sizeof(enum slabinfo_item) * (numitems + 1))))
return -ENOMEM;
memcpy(this->items, items, sizeof(enum slabinfo_item) * numitems);
this->items[numitems] = PROCPS_SLABINFO_logical_end;
this->numitems = numitems + 1;
if (this->extents)
extents_free_all(this);
return 1;
}
return 0;
} // end: stacks_reconfig_maybe
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// ___ Public Functions |||||||||||||||||||||||||||||||||||||||||||||||||||||||
2015-07-04 10:29:59 +05:30
library: more tweaks for code and/or comments, 3rd gen Following is a summary of significant changes (if any) to each of these now upgraded 3rd gen library modules. <meminfo> ............................................ . eliminated duplicate decl of 'struct procps_meminfo' . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . how did i miss relocating all these friggin' #undefs . cleanup 'get' return logic (remove a redundant 'if') <pids> ............................................... . repositioned the procps_pidsinfo structure in header . removed the extra trailing comma from enum pids_item . standardized/normalized results struct union members <slabinfo> ........................................... . corrected comment typo (jeeze, in an 'aligned' para) . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . removed an obsolete #undef from procps_slabinfo_sort . cleanup 'get' return logic (remove a redundant 'if') <stat> ............................................... . how did i miss relocating all these friggin' #undefs . corrected an initialization fencepost used with numa <=== see Craig, here's a bug fix . removed the extra trailing comma from enum stat_item . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . strengthen those parm checks in procps_stat_get func . cleanup 'get' return logic (remove a redundant 'if') <vmstat> ............................................. . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . cleanup 'get' return logic (remove a redundant 'if') [ virtually all of these tweaks reflect the author's ] [ continuing pursuit of an unreasonable goal -- that ] [ of a 'perfect' (plus 'pretty') C language program! ] Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-14 10:30:00 +05:30
// --- standard required functions --------------------------------------------
/*
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* procps_slabinfo_new():
*
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* @info: location of returned new structure
*
* Returns: < 0 on failure, 0 on success along with
* a pointer to a new context struct
*/
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
PROCPS_EXPORT int procps_slabinfo_new (
struct slabinfo_info **info)
2015-07-04 10:29:59 +05:30
{
struct slabinfo_info *p;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
int rc;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (info == NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct slabinfo_info))))
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return -ENOMEM;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
#ifdef ENFORCE_LOGICAL
p->select_ext.lowest = PROCPS_SLABS_OBJS;
p->select_ext.highest = PROCPS_SLABS_DELTA_SIZE_TOTAL;
p->fetch_ext.lowest = PROCPS_SLABNODE_NAME;
p->fetch_ext.highest = PROCPS_SLABNODE_SIZE;
#endif
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
p->refcount = 1;
/* do a priming read here for the following potential benefits: |
1) see if that caller's permissions were sufficient (root) |
library: more tweaks for code and/or comments, 3rd gen Following is a summary of significant changes (if any) to each of these now upgraded 3rd gen library modules. <meminfo> ............................................ . eliminated duplicate decl of 'struct procps_meminfo' . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . how did i miss relocating all these friggin' #undefs . cleanup 'get' return logic (remove a redundant 'if') <pids> ............................................... . repositioned the procps_pidsinfo structure in header . removed the extra trailing comma from enum pids_item . standardized/normalized results struct union members <slabinfo> ........................................... . corrected comment typo (jeeze, in an 'aligned' para) . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . removed an obsolete #undef from procps_slabinfo_sort . cleanup 'get' return logic (remove a redundant 'if') <stat> ............................................... . how did i miss relocating all these friggin' #undefs . corrected an initialization fencepost used with numa <=== see Craig, here's a bug fix . removed the extra trailing comma from enum stat_item . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . strengthen those parm checks in procps_stat_get func . cleanup 'get' return logic (remove a redundant 'if') <vmstat> ............................................. . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . cleanup 'get' return logic (remove a redundant 'if') [ virtually all of these tweaks reflect the author's ] [ continuing pursuit of an unreasonable goal -- that ] [ of a 'perfect' (plus 'pretty') C language program! ] Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-14 10:30:00 +05:30
2) make delta results potentially useful, even if 1st time | */
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if ((rc = read_slabinfo_failed(p))) {
procps_slabinfo_unref(&p);
return rc;
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
*info = p;
return 0;
} // end: procps_slabinfo_new
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
PROCPS_EXPORT int procps_slabinfo_ref (
struct slabinfo_info *info)
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{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (info == NULL)
return -EINVAL;
info->refcount++;
return info->refcount;
} // end: procps_slabinfo_ref
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
PROCPS_EXPORT int procps_slabinfo_unref (
struct slabinfo_info **info)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (info == NULL || *info == NULL)
return -EINVAL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
(*info)->refcount--;
if ((*info)->refcount == 0) {
if ((*info)->slabinfo_fp) {
fclose((*info)->slabinfo_fp);
(*info)->slabinfo_fp = NULL;
}
if ((*info)->select_ext.extents)
extents_free_all((&(*info)->select_ext));
if ((*info)->select_ext.items)
free((*info)->select_ext.items);
if ((*info)->fetch.anchor)
free((*info)->fetch.anchor);
if ((*info)->fetch.results.stacks)
free((*info)->fetch.results.stacks);
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if ((*info)->fetch_ext.extents)
extents_free_all(&(*info)->fetch_ext);
if ((*info)->fetch_ext.items)
free((*info)->fetch_ext.items);
free((*info)->nodes);
free(*info);
*info = NULL;
return 0;
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return (*info)->refcount;
} // end: procps_slabinfo_unref
2015-07-04 10:29:59 +05:30
library: more tweaks for code and/or comments, 3rd gen Following is a summary of significant changes (if any) to each of these now upgraded 3rd gen library modules. <meminfo> ............................................ . eliminated duplicate decl of 'struct procps_meminfo' . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . how did i miss relocating all these friggin' #undefs . cleanup 'get' return logic (remove a redundant 'if') <pids> ............................................... . repositioned the procps_pidsinfo structure in header . removed the extra trailing comma from enum pids_item . standardized/normalized results struct union members <slabinfo> ........................................... . corrected comment typo (jeeze, in an 'aligned' para) . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . removed an obsolete #undef from procps_slabinfo_sort . cleanup 'get' return logic (remove a redundant 'if') <stat> ............................................... . how did i miss relocating all these friggin' #undefs . corrected an initialization fencepost used with numa <=== see Craig, here's a bug fix . removed the extra trailing comma from enum stat_item . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . strengthen those parm checks in procps_stat_get func . cleanup 'get' return logic (remove a redundant 'if') <vmstat> ............................................. . standardized/normalized results struct union members . added 'std' & 'var' dividers in .c file, like <pids> . cleanup 'get' return logic (remove a redundant 'if') [ virtually all of these tweaks reflect the author's ] [ continuing pursuit of an unreasonable goal -- that ] [ of a 'perfect' (plus 'pretty') C language program! ] Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-14 10:30:00 +05:30
// --- variable interface functions -------------------------------------------
PROCPS_EXPORT struct slabinfo_result *procps_slabinfo_get (
struct slabinfo_info *info,
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
enum slabinfo_item item)
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
static time_t sav_secs;
time_t cur_secs;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (info == NULL)
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (item < 0 || item >= PROCPS_SLABINFO_logical_end)
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
/* we will NOT read the slabinfo file with every call - rather, we'll offer
a granularity of 1 second between reads ... */
cur_secs = time(NULL);
if (1 <= cur_secs - sav_secs) {
if (read_slabinfo_failed(info))
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
sav_secs = cur_secs;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
}
info->get_this.item = item;
// with 'get', we must NOT honor the usual 'noop' guarantee
// if (item > PROCPS_SLABINFO_noop)
info->get_this.result.ul_int = 0;
Item_table[item].setsfunc(&info->get_this, &info->hist, &info->nul_node);
return &info->get_this;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: procps_slabinfo_get
/* procps_slabinfo_reap():
*
* Harvest all the requested SLABNODE (individual nodes) information
* providing the result stacks along with the total number of nodes.
*
* Returns: pointer to a slabinfo_reap struct on success, NULL on error.
*/
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
PROCPS_EXPORT struct slabinfo_reap *procps_slabinfo_reap (
struct slabinfo_info *info,
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
enum slabinfo_item *items,
int numitems)
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{
if (info == NULL || items == NULL)
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (0 > stacks_reconfig_maybe(&info->fetch_ext, items, numitems))
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (info->fetch_ext.dirty_stacks)
cleanup_stacks_all(&info->fetch_ext);
if (read_slabinfo_failed(info))
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
stacks_fetch(info);
info->fetch_ext.dirty_stacks = 1;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
return &info->fetch.results;
} // end: procps_slabinfo_reap
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
/* procps_slabinfo_select():
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*
* Obtain all the requested SLABS (global) information then return
* it in a single library provided results stack.
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*
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* Returns: pointer to a slabinfo_stack struct on success, NULL on error.
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*/
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
PROCPS_EXPORT struct slabinfo_stack *procps_slabinfo_select (
struct slabinfo_info *info,
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
enum slabinfo_item *items,
int numitems)
2015-07-04 10:29:59 +05:30
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (info == NULL || items == NULL)
return NULL;
2015-07-04 10:29:59 +05:30
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (0 > stacks_reconfig_maybe(&info->select_ext, items, numitems))
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (!info->select_ext.extents
&& !(stacks_alloc(&info->select_ext, 1)))
return NULL;
if (info->select_ext.dirty_stacks)
cleanup_stacks_all(&info->select_ext);
if (read_slabinfo_failed(info))
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
assign_results(info->select_ext.extents->stacks[0], &info->hist, &info->nul_node);
info->select_ext.dirty_stacks = 1;
return info->select_ext.extents->stacks[0];
} // end: procps_slabinfo_select
2015-07-04 10:29:59 +05:30
/*
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
* procps_slabinfo_sort():
2015-07-04 10:29:59 +05:30
*
* Sort stacks anchored in the passed stack pointers array
* based on the designated sort enumerator and specified order.
*
* Returns those same addresses sorted.
*
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
* Note: all of the stacks must be homogeneous (of equal length and content).
*/
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
PROCPS_EXPORT struct slabinfo_stack **procps_slabinfo_sort (
struct slabinfo_info *info,
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabinfo_stack *stacks[],
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
int numstacked,
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
enum slabinfo_item sortitem,
enum slabinfo_sort_order order)
{
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
struct slabinfo_result *p;
struct sort_parms parms;
int offset;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
if (info == NULL || stacks == NULL)
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
// a slabinfo_item is currently unsigned, but we'll protect our future
if (sortitem < 0 || sortitem >= PROCPS_SLABINFO_logical_end)
return NULL;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (order != PROCPS_SLABINFO_ASCEND && order != PROCPS_SLABINFO_DESCEND)
return NULL;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
if (numstacked < 2)
return stacks;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
offset = 0;
p = stacks[0]->head;
for (;;) {
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (p->item == sortitem)
break;
++offset;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
if (p->item == PROCPS_SLABINFO_logical_end)
return NULL;
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
++p;
}
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
parms.offset = offset;
parms.order = order;
qsort_r(stacks, numstacked, sizeof(void *), (QSR_t)Item_table[p->item].sortfunc, &parms);
library: slab is redesigned to use 'stack' vs. 'chain' In addition to that text shown below the line which is common to several commit messages, this patch contains several minor changes with lessor impact upon the API: . A 'read' was added to function procps_slabnode_count (but only when necessary, i.e. info->nodes_used == 0). . The #include header files are ordered alphabetically now, with all those <sys/??> types separately grouped. ------------------------------------------------------ . The former 'chains' have now become 'stacks' without the 'next' pointer in each result struct. The pointers initially seemed to offer some flexibility with memory allocations and benefits for the library access logic. However, user access was always via displacement and a a statically allocated chain was cumbersome to define. . An enumerator ending in '_noop' will no longer serve as a fencepost delimiter. Rather, it has become a much more important and flexible user oriented tool. Adding one or more such 'items' in any items list passed into the library becomes the means of extending the 'stack' to also include user (not just library) data. Any such data is guaranteed to never be altered by the library. . Anticipating PID support, where many different types must be represented in a result structure, we'll adopt a common naming standard. And, while not every results structure currently needs to reflect disparate types a union will be employed so the same dot qualifier ('.') can be used consistently when accessing all such data. Signed-off-by: Jim Warner <james.warner@comcast.net>
2015-07-21 10:30:00 +05:30
return stacks;
library: normalize/standardize the i/f, <SLABINFO> api Before this major redesign, the slabs interface likely was our messiest 2nd generation attempt at opaqueness. Beyond the standard 'new', 'ref' & 'unref', there were a total of 12 exported functions. Now, there are four. The 1st step was to remove several of those functions. These were quick to go since they were not used (yet): . procps_slabnode_count . procps_slabnode_getname . procps_slabnode_getstack Then, the following were internalized so users needn't be burdened with implementation details in the future: . procps_slabinfo_read (renamed: read_slabinfo_failed) . procps_slabnode_stacks_alloc (renamed: stacks_alloc) Still others evolved into the minimal interface we had strived for in the other upgraded 3rd generation APIs: . procps_slabnode_get -----------> procps_slabinfo_get . separate stack_alloc/fill --> procps_slabinfo_select . separate stacks_alloc/fill ---> procps_slabinfo_reap . procps_slabnode_stacks_sort --> procps_slabinfo_sort ------------------------------------------------------ Beyond those reductions, the major modifications were: . This API tries to be as forgiving as possible and as such won't throw errors when a caller request makes no sense. For example, if a 'get' or 'select' requested a SLABNODE item (with no current means to id that node), results will be zero. By the same token, should 'reap' include a global SLABS item (meaning those values will be duplicated in *every* node stack) it'll be allowed. . If the above behavior is undesired, a new #define of ENFORCE_LOGICAL can be used to restrict certain items. . Permission problems will now be caught at 'new' time thanks to a priming 'read' call. That read also serves to make DELTA values potentially useful at 1st access. . Separate slab/slabnode enumerators were consolidated into one, simplifying validation & the results struct. . Several internal parameter checks were relaxed since they were already checked by the caller. Besides if we cannot trust our own code we might as well hang it up. . That sort provision was made more efficient and will offer the ascending choice, in addition to descending. ------------------------------------------------------ Lastly, some additional thoughts regarding the future: . It would not be difficult to expand 'select' to also accept a nodeid, or to clone it as 'select_node'. And, should the same be extended to 'get', a results struct could be returned instead of signed long accommodating the extra data type(s) like a node name (string data). . The 'get' function is not currently affected by that define ENFORCE_LOGICAL. However, at some future point perhaps -EINVAL would be more appropriate than a zero. Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-06-05 10:30:00 +05:30
} // end: procps_slabinfo_sort