procps/slabtop.c

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/*
* slabtop.c - utility to display kernel slab information.
*
* Chris Rivera <cmrivera@ufl.edu>
* Robert Love <rml@tech9.net>
*
* Copyright (C) 2003 Chris Rivera
*
* 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
*/
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <locale.h>
#include <ncurses.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
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#include <sys/ioctl.h>
#include <sys/select.h>
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#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include "c.h"
#include "fileutils.h"
#include "nls.h"
#include "strutils.h"
#include <proc/slabinfo.h>
#define DEFAULT_SORT SLAB_NUM_OBJS
#define CHAINS_ALLOC 150
#define MAXTBL(t) (int)( sizeof(t) / sizeof(t[0]) )
#define DEFAULT_DELAY 3
static unsigned short Cols, Rows;
static struct termios Saved_tty;
static long Delay = 0;
static int Run_once = 0;
static struct slabinfo_info *Slab_info;
enum slabinfo_item Sort_item = DEFAULT_SORT;
enum slabinfo_sort_order Sort_Order = SLABINFO_SORT_DESCEND;
enum slabinfo_item Node_items[] = {
SLAB_NUM_OBJS, SLAB_ACTIVE_OBJS, SLAB_PERCENT_USED,
SLAB_OBJ_SIZE, SLAB_NUMS_SLABS, SLAB_OBJ_PER_SLAB,
SLAB_SIZE_TOTAL, SLAB_NAME,
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>
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/* next 2 are sortable but are not displayable,
thus they need not be represented in the Relative_enums */
SLAB_PAGES_PER_SLAB, SLAB_ACTIVE_SLABS };
enum Relative_node {
nod_OBJS, nod_AOBJS, nod_USE, nod_OSIZE,
nod_SLABS, nod_OPS, nod_SIZE, nod_NAME };
#define MAX_ITEMS (int)(sizeof(Node_items) / sizeof(Node_items[0]))
#define PRINT_line(fmt, ...) if (Run_once) printf(fmt, __VA_ARGS__); else printw(fmt, __VA_ARGS__)
/*
* term_resize - set the globals 'Cols' and 'Rows' to the current terminal size
*/
static void term_resize (int unusused __attribute__ ((__unused__)))
{
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struct winsize ws;
if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) && ws.ws_row > 10) {
Cols = ws.ws_col;
Rows = ws.ws_row;
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} else {
Cols = 80;
Rows = 24;
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}
}
static void sigint_handler (int unused __attribute__ ((__unused__)))
{
Delay = 0;
}
static void __attribute__((__noreturn__)) usage (FILE *out)
{
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fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -d, --delay <secs> delay updates\n"), out);
fputs(_(" -o, --once only display once, then exit\n"), out);
fputs(_(" -s, --sort <char> specify sort criteria by character (see below)\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fputs(_("\nThe following are valid sort criteria:\n"), out);
fputs(_(" a: sort by number of active objects\n"), out);
fputs(_(" b: sort by objects per slab\n"), out);
fputs(_(" c: sort by cache size\n"), out);
fputs(_(" l: sort by number of slabs\n"), out);
fputs(_(" v: sort by (non display) number of active slabs\n"), out);
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fputs(_(" n: sort by name\n"), out);
fputs(_(" o: sort by number of objects (the default)\n"), out);
fputs(_(" p: sort by (non display) pages per slab\n"), out);
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fputs(_(" s: sort by object size\n"), out);
fputs(_(" u: sort by cache utilization\n"), out);
fprintf(out, USAGE_MAN_TAIL("slabtop(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void set_sort_stuff (const char key)
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{
Sort_item = DEFAULT_SORT;
Sort_Order = SLABINFO_SORT_DESCEND;
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switch (tolower(key)) {
case 'n':
Sort_item = SLAB_NAME;
Sort_Order = SLABINFO_SORT_ASCEND;
break;
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case 'o':
Sort_item = SLAB_NUM_OBJS;
break;
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case 'a':
Sort_item = SLAB_ACTIVE_OBJS;
break;
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case 's':
Sort_item = SLAB_OBJ_SIZE;
break;
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case 'b':
Sort_item = SLAB_OBJ_PER_SLAB;
break;
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case 'p':
Sort_item = SLAB_PAGES_PER_SLAB;
break;
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case 'l':
Sort_item = SLAB_NUMS_SLABS;
break;
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case 'v':
Sort_item = SLAB_ACTIVE_SLABS;
break;
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case 'c':
Sort_item = SLAB_SIZE_TOTAL;
break;
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case 'u':
Sort_item = SLAB_PERCENT_USED;
break;
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default:
break;
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}
}
static void parse_opts (int argc, char **argv)
{
static const struct option longopts[] = {
{ "delay", required_argument, NULL, 'd' },
{ "sort", required_argument, NULL, 's' },
{ "once", no_argument, NULL, 'o' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }};
int o;
while ((o = getopt_long(argc, argv, "d:s:ohV", longopts, NULL)) != -1) {
switch (o) {
case 'd':
if (Run_once)
xerrx(EXIT_FAILURE, _("Cannot combine -d and -o options"));
errno = 0;
Delay = strtol_or_err(optarg, _("illegal delay"));
if (Delay < 1)
xerrx(EXIT_FAILURE, _("delay must be positive integer"));
break;
case 's':
set_sort_stuff(optarg[0]);
break;
case 'o':
if (Delay != 0)
xerrx(EXIT_FAILURE, _("Cannot combine -d and -o options"));
Run_once=1;
break;
case 'V':
printf(PROCPS_NG_VERSION);
exit(EXIT_SUCCESS);
case 'h':
usage(stdout);
default:
usage(stderr);
}
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}
if (optind != argc)
usage(stderr);
if (!Run_once && Delay == 0)
Delay = DEFAULT_DELAY;
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}
static void print_summary (void)
{
#define totalVAL(e,t) SLABINFO_VAL(e, t, p, Slab_info)
enum slabinfo_item items[] = {
SLABS_ACTIVE_OBJS, SLABS_NUM_OBJS,
SLABS_ACTIVE_SLABS, SLABS_NUMS_SLABS,
SLABS_CACHES_ACTIVE, SLABS_CACHES_TOTAL,
SLABS_SIZE_ACTIVE, SLABS_SIZE_TOTAL,
SLABS_OBJ_SIZE_MIN, SLABS_OBJ_SIZE_AVG,
SLABS_OBJ_SIZE_MAX
};
enum rel_items {
tot_AOBJS, tot_OBJS, tot_ASLABS, tot_SLABS,
tot_ACACHES, tot_CACHES, tot_ACTIVE, tot_TOTAL,
tot_MIN, tot_AVG, tot_MAX
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};
struct slabinfo_stack *p;
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if (!(p = procps_slabinfo_select(Slab_info, items, MAXTBL(items))))
xerrx(EXIT_FAILURE, _("Error getting slab summary results"));
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>
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PRINT_line(" %-35s: %u / %u (%.1f%%)\n"
, /* Translation Hint: Next five strings must not
* exceed a length of 35 characters. */
/* xgettext:no-c-format */
_("Active / Total Objects (% used)")
, totalVAL(tot_AOBJS, u_int)
, totalVAL(tot_OBJS, u_int)
, 100.0 * totalVAL(tot_AOBJS, u_int) / totalVAL(tot_OBJS, u_int));
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>
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PRINT_line(" %-35s: %u / %u (%.1f%%)\n"
, /* xgettext:no-c-format */
_("Active / Total Slabs (% used)")
, totalVAL(tot_ASLABS, u_int)
, totalVAL(tot_SLABS, u_int)
, 100.0 * totalVAL(tot_ASLABS, u_int) / totalVAL(tot_SLABS, u_int));
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>
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PRINT_line(" %-35s: %u / %u (%.1f%%)\n"
, /* xgettext:no-c-format */
_("Active / Total Caches (% used)")
, totalVAL(tot_ACACHES, u_int)
, totalVAL(tot_CACHES, u_int)
, 100.0 * totalVAL(tot_ACACHES, u_int) / totalVAL(tot_CACHES, u_int));
PRINT_line(" %-35s: %.2fK / %.2fK (%.1f%%)\n"
, /* xgettext:no-c-format */
_("Active / Total Size (% used)")
, totalVAL(tot_ACTIVE, ul_int) / 1024.0
, totalVAL(tot_TOTAL, ul_int) / 1024.0
, 100.0 * totalVAL(tot_ACTIVE, ul_int) / totalVAL(tot_TOTAL, ul_int));
PRINT_line(" %-35s: %.2fK / %.2fK / %.2fK\n\n"
, _("Minimum / Average / Maximum Object")
, totalVAL(tot_MIN, u_int) / 1024.0
, totalVAL(tot_AVG, u_int) / 1024.0
, totalVAL(tot_MAX, u_int) / 1024.0);
#undef totalVAL
}
static void print_headings (void)
{
/* Translation Hint: Please keep alignment of the
* following intact. */
PRINT_line("%-78s\n", _(" OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME"));
}
static void print_details (struct slabinfo_stack *stack)
{
#define nodeVAL(e,t) SLABINFO_VAL(e, t, stack, Slab_info)
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>
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PRINT_line("%6u %6u %3u%% %7.2fK %6u %8u %9luK %-23s\n"
, nodeVAL(nod_OBJS, u_int)
, nodeVAL(nod_AOBJS, u_int)
, nodeVAL(nod_USE, u_int)
, nodeVAL(nod_OSIZE, u_int) / 1024.0
, nodeVAL(nod_SLABS, u_int)
, nodeVAL(nod_OPS, u_int)
, nodeVAL(nod_SIZE, ul_int) / 1024
, nodeVAL(nod_NAME, str));
return;
#undef nodeVAL
}
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int main(int argc, char *argv[])
{
int is_tty, rc = EXIT_SUCCESS;
unsigned short old_rows;
#ifdef HAVE_PROGRAM_INVOCATION_NAME
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program_invocation_name = program_invocation_short_name;
#endif
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setlocale (LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
parse_opts(argc, argv);
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if (procps_slabinfo_new(&Slab_info) < 0)
xerr(EXIT_FAILURE, _("Unable to create slabinfo structure"));
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if (!Run_once) {
is_tty = isatty(STDIN_FILENO);
if (is_tty && tcgetattr(STDIN_FILENO, &Saved_tty) == -1)
xwarn(_("terminal setting retrieval"));
old_rows = Rows;
term_resize(0);
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initscr();
resizeterm(Rows, Cols);
signal(SIGWINCH, term_resize);
signal(SIGINT, sigint_handler);
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}
do {
struct slabinfo_reaped *reaped;
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struct timeval tv;
fd_set readfds;
int i;
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if (!(reaped = procps_slabinfo_reap(Slab_info, Node_items, MAXTBL(Node_items)))) {
xwarn(_("Unable to get slabinfo node data"));
rc = EXIT_FAILURE;
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break;
}
if (!(procps_slabinfo_sort(Slab_info, reaped->stacks, reaped->total, Sort_item, Sort_Order))) {
xwarn(_("Unable to sort slab nodes"));
rc = EXIT_FAILURE;
break;
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}
if (Run_once) {
print_summary();
print_headings();
for (i = 0; i < reaped->total; i++)
print_details(reaped->stacks[i]);
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break;
}
if (old_rows != Rows) {
resizeterm(Rows, Cols);
old_rows = Rows;
}
move(0, 0);
print_summary();
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attron(A_REVERSE);
print_headings();
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attroff(A_REVERSE);
for (i = 0; i < Rows - 8 && i < reaped->total; i++)
print_details(reaped->stacks[i]);
refresh();
FD_ZERO(&readfds);
FD_SET(STDIN_FILENO, &readfds);
tv.tv_sec = Delay;
tv.tv_usec = 0;
if (select(STDOUT_FILENO, &readfds, NULL, NULL, &tv) > 0) {
char c;
if (read(STDIN_FILENO, &c, 1) != 1
|| (c == 'Q' || c == 'q'))
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break;
set_sort_stuff(c);
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}
// made zero by sigint_handler()
} while (Delay);
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if (!Run_once) {
if (is_tty)
tcsetattr(STDIN_FILENO, TCSAFLUSH, &Saved_tty);
endwin();
}
procps_slabinfo_unref(&Slab_info);
return rc;
}