Commit Graph

2021 Commits

Author SHA1 Message Date
Jim Warner
b2bd65407a top: provide -E command line switch for memory scaling
In their 3.2.7 version of top, Redhat introduced an -M
switch to automatically scale Summary Area memory data
to avoid truncation (and the resulting '+' indicator).

The procps-ng top does not employ suffixes with memory
data nor does it allow for different scaling with each
separate value. Rather, scaling appears at line start.

If built without ./configure --disable-modern-top, the
Summary Area memory will be scaled at GiB which should
lessen chance of truncation. Otherwise KiB was used to
reflect such memory, increasing the truncation chance.

And while 'W' can be used to preserve some appropriate
scaling value, there are arguments against such rcfile
approaches as cited in the issue and bug report below.

So this commit will bump the Summary Area memory scale
factor from KiB to MiB when using --disable-modern-top
as a concession to that Redhat bug report noted below.

And it also introduces a new command line switch which
can force any desired scaling regardless of the rcfile
or which ./configure option might have been specified.

[ for top's help text we'll show 'E' as if it were a ]
[ switch without arguments in order to keep the help ]
[ text displayable without wrap in an 80x24 terminal ]

[ the man page, however, will show all k-e arguments ]

Reference(s):
https://gitlab.com/procps-ng/procps/issues/53
https://bugzilla.redhat.com/show_bug.cgi?id=1034466

[ this patch has been adapted from the master branch ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-03-16 22:08:07 +11:00
Jim Warner
f318be467b top: show fewer decimal places for memory (by default)
After much reflection I've come to the conclusion that
displaying 3 decimal places (usually) when memory data
had been scaled is no longer optimal with today's ever
increasing amounts. And given that not all task memory
fields are the same widths, inconsistencies can easily
arise as illustrated and discussed in the issue below.

Instead of unilaterally reducing the number of decimal
places, this commit will sneak in such a change via an
existing configure option that was very likely unused.

The former 'disable-wide-memory' option has now become
'enable-wide-memory', which can be used if the current
behavior (3 decimal places) is preferred. Without that
option, whenever memory is scaled beyond KiB, just one
decimal place will be shown in Summary and Task areas.

And Task area field width will no longer be changed by
this revised configure option. Instead, all such field
widths will now be fixed at the former maximum values.

Reference(s):
https://gitlab.com/procps-ng/procps/issues/50

[ this patch has been adapted from the master branch ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-03-16 22:08:07 +11:00
Jim Warner
7468e229e8 top: correct alphabetic ordering with some enumerators
[ this patch has been adapted from the master branch ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-03-16 22:08:07 +11:00
Craig Small
ff05573f0d pkill: Return 0 if successfully killed process
Original report:
When trying kill a process with insufficient privileges (see blow),
pkill displays the error message “... failed: Operation not permitted”,
but returns 0. Surely it should return 3?

$ pkill syslogd ; echo $?
pkill: killing pid 373 failed: Operation not permitted
0

Return value 0 means one of more things matched. For a pgrep (which
shares code with pkill) this makes sense, there was a match. It seems
wrong for pkill to return 0 when it in fact could not do what you told
it to.  However return value 3 means a fatal error and it's not fatal.

Looking at other programs when trying to kill things it cannot kill.
shell kill returns 1, procps kill returns 1, killall returns 1, skill
returns 0 (and says it was successful!, ah well poor old skill)

The consensus seems to be that you return 1 if you cannot kill it, even
if you found it. In other words the return value for both not found and
not able to kill it is the same.

pkill only returns 0 if something was killed. This means we found a
match AND the kill() system call worked too.

References:
 https://bugs.debian.org/852758

Signed-off-by: Craig Small <csmall@enc.com.au>
2017-02-04 12:00:24 +11:00
Craig Small
1f094f51f1 NEWS: Very minor typo fixed
Signed-off-by: Craig Small <csmall@enc.com.au>
2017-02-04 11:07:21 +11:00
Jim Warner
a2d2b89ce0 NEWS: updated with the two most recent program changes
Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-02-04 11:07:06 +11:00
Jim Warner
a81a74a1df top: adapt the master branch XDG specification support
This patch adapts a master branch commit to our newlib
branch. Shown below was that original commit msg text.

------------------------------------------------------
top: Add unobtrusive XDG support

By default the file HOME/.toprc will be prefered.  This ensures there
should be minimal breakage even if this file is later created by some
other means.  Otherwise we will follow the new behaviour described by
the XDG Base Directory Specification:

If the XDG_CONFIG_HOME environment variable is available we will attempt
to use this as XDG_CONFIG_HOME/procps/toprc otherwise we will fall-back
to HOME/.config/procps/toprc instead.

Signed-off-by: Earnestly <zibeon@gmail.com>
------------------------------------------------------

Reference(s):
. master branch original
commit 0a0f7d60e309c13c8a399bc2187bed6e3e156b43
. discussion thread
https://gitlab.com/procps-ng/procps/merge_requests/38

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-02-04 11:07:06 +11:00
Jan Rybar
9252a04eae pgrep: warning about 15+ chars name only if zero matches found
This avoids situations where longer regex which matches short-named proc
is used. Test for pgrep updated.

This is the newlib update of 5d12be1b7e8cc690a4d8778754aae5db4c07db2b
Signed-off-by: Craig Small <csmall@enc.com.au>
2017-01-26 16:52:23 +11:00
Craig Small
2598e9f2ce documentation: Update pids manual pages
Updated the full suite of manual pages for the procps_pids_*
functions. The only one missing is procps_pids_get which
may not be required.
2017-01-05 09:44:04 +11:00
Jim Warner
ea930f6f9e library <stat>: input file buffer size must be dynamic
Since its introduction, our evolved /proc/stat API has
relied on a static buffer of 8192 bytes. This approach
is probably Ok for other /proc files but it would only
accommodate around 100 processors. If such a threshold
were exceeded then this interface could never succeed.

Now days 100 processors doesn't seem at all excessive.

So this commit trades that static buffer for a dynamic
self-tuning one. And since so much former top CPU code
was already rolled into this module, we just stole the
already proven top dynamic buffer management code too.

[ this also meant switching low level unbuffered I/O ]
[ calls to standard library buffered I/O calls. that ]
[ is exactly what <slabinfo> and <diskstats> employ. ]

Reference(s):
. 1st gen readstat introduction
commit a410e236ab

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-05 06:48:38 +11:00
Jim Warner
282ee362f0 library <stat>: improve response to cpu offline/online
With the addition of those new derived SUM values, any
CPUs taken offline or brought online would distort the
historical (delta) results.  So this patch just forces
a history reset when such transitions are encountered.

Reference(s):
. derived SUM provisions introduced
commit 2c86c4984a

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-05 06:48:38 +11:00
Jim Warner
f82ac70e13 library <slabinfo>: make read function name consistent
For each of those interfaces employing a priming read,
all the other 'read' functions begin with the module's
name except this guy which began with 'read_slabinfo'.

Now, they'll all begin with their module name then end
the same with a '_read_failed' boolean hinting suffix.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-05 06:48:38 +11:00
Jim Warner
e524e48138 library: eliminate distorted history 1st time switches
Upon reflection, at the point where the 'priming read'
was introduced, any possibility of history distortions
was also eliminated.  This was true because all of the
'old' (zeroed) data will have been replaced with 'new'
data whenever a user finally calls get, select & reap.

Thus, any DELTA values will automatically reflect that
interval between 'new' and subsequent retrieval calls.

[ diskstats didn't actually employ a 1st time switch ]
[ like the others so we have changed a comment only. ]
[ but that module will retain something similar used ]
[ inside node_update whenever a new node is created. ]

Reference(s):
. priming read added to slabinfo
commit 5d5a52a380
. priming read added to diskstats
commit ecd64f4445
. priming read added to meminfo, stat, vmstat
commit 1a2b62c779

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-05 06:48:38 +11:00
Jim Warner
904f4c3b35 top: exploits several <stat> new category calculations
This commit just exploits those new library provisions
for tic categories, introduced in the preceding patch,
which had been prompted by the issue referenced below.

[ ok it also corrects the top graph for system usage ]
[ since this turkey failed to include tics for these ]
[ two interrupts: STAT_TIC_IRQ and STAT_TIC_SOFTIRQ. ]

Reference(s):
https://gitlab.com/procps-ng/procps/issues/48

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-04 08:29:44 +11:00
Jim Warner
2c86c4984a library <stat>: standardized new category calculations
This commit arose out of the discussion (and research)
surrounding the issue cited below. It is an attempt to
consolidate and standardize the calculation of jiffies
categories (e.g. 'idle', 'busy', etc.) once & for all.

Also included is the enum STAT_TIC_NUM_CONTRIBUTORS in
case anyone, in the future, decides to calculate usage
based upon elapsed time * Hz (like top does in process
level %CPU stats). In such an event, a total number of
CPUs or NUMA Nodes would be needed for proper scaling.

Reference(s):
https://gitlab.com/procps-ng/procps/issues/48

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-04 08:29:44 +11:00
Jim Warner
12e070dd5f library: ensure 'namespace' types treated consistently
Unlike the ps kludge under the master branch to ensure
that namespaces appear the same under both 32 & 64-bit
models, this newlib branch already used a proper type.

However source data still carried the original type as
'signed long' versus that more proper 'unsigned long'.

So, this patch makes sources & destinations identical.

Reference(s):
. master branch ps kludge
commit c41c614b0c

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-04 08:29:44 +11:00
Jim Warner
66e8e2723d ps: finish purging those references to PIDS_WCHAN_ADDR
Aw shucks, not all support for this defunct enumerator
was removed via the commits shown below (but, is now).

[ what remained were just variables named after that ]
[ deprecated/deleted enumerator, but still & all ... ]

[ plus, i have left the doc/libproc.3 file untouched ]
[ since it already appears badly out of date anyway! ]

Reference(s):
. ps references partially purged
commit 66c4024d75
. enumerator purged from library
commit 912075605b

Signed-off-by: Jim Warner <james.warner@comcast.net>
2017-01-04 08:29:44 +11:00
Jan Rybar
5602dd04e1 library: don't strip off prefixes from the wchan names
This commit will resolve the RedHat Bugzilla #1322111.

[ import from identical commit against master branch ]
[ but without trailing whitespace, thank you so much ]

Imported by: Jim Warner <james.warner@comcast.net>
2016-12-07 22:07:00 +11:00
Jim Warner
1c0d54e963 ps: now made responsive to 32 or 64-bit address widths
While a Debian bug report referenced below was limited
to the 'eip' and 'esp' fields, this patch also extends
address width adaptations to some other addresses too.

[ and, we do so in a far less invasive manner than a ]
[ redhat approach shown below adding two new fields! ]

Reference(s):
. new debian bug report
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=846361
. old redhat solution
https://bugzilla.redhat.com/show_bug.cgi?id=244152

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-12-07 22:07:00 +11:00
Jim Warner
8ba07209f0 library: accumulated miscellaneous code/comment tweaks
Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-12-07 22:07:00 +11:00
Jim Warner
57dfe6f92c top: accumulated misc tweaks to code/comments/man page
Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-12-07 22:07:00 +11:00
Jim Warner
e70531a945 library: protect against possible 'refcount' underflow
In each module employing a priming read at 'new' time,
should that read fail, a call to 'unref' will be made.

However, there is a hidden dependency that these calls
must never occur before the context 'refcount' was set
due to the way an 'unref' conditional was constructed.

So this commit just ensures that 'unref' will function
as expected, even if called with a 'refcount' of zero.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-12-07 22:06:59 +11:00
Martin Polednik
b3e8581a30 ps: recognize SCHED_DEADLINE 2016-11-21 21:56:37 +11:00
Jim Warner
f0064ac18f top: tweak some stuff relating to non-displayed fields
In the commit referenced below, in addition to several
tweaks to comments, 3 fields were no longer assured of
being present in the results stacks. However, 2 of the
3 fields might, in fact, be required even if they were
not currently being displayed in any of the 4 windows.

The PIDS_CMD is used in two separate 'Inspect' headers
('Y' command) and the PIDS_ID_EUID is required if that
'User Filter' ('u' or 'U' command) was being employed.

That latter field's inclusion will be made conditional
but the former field must be unconditionally included.

( for old top, PIDS_CMD would have always been there )

Reference(s):
commit 4e4debda9b

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-16 08:24:32 +11:00
Jim Warner
66c4024d75 ps: respond to loss of that PIDS_WCHAN_ADDR enumerator
No longer will ps print nwchan as 'ffffff', '-' or '1'
since the proc/PID/stat wchan field didn't represent a
real address anyway. Rather, the field will henceforth
output a dash ('-'), the ps customary 'not available'.

That man document was also tweaked to better represent
actual behavior. An asterisk ('*') was never shown for
threaded tasks and that dash ('-') usually didn't mean
running tasks (sometimes associated with permissions).

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-16 08:23:38 +11:00
Jim Warner
912075605b library <stat>: remove that PIDS_WCHAN_ADDR enumerator
Removing the Item_table 'stat' oldflags for WCHAN_ADDR
was wrong since that 'stat' field is not a constant 0.
Rather, it could assume these 3 values: -1, 0, and +1.

I have not been able to pin down a '-1' result, but it
probably means some sort of permission error (-EPERM).

The '1' or '0' values were supposed to distinguish the
tasks that were or were not blocked (whether there was
a wchan address). However, in practice there is little
correlation between those values and availability of a
kernel symbol in /proc/$$/wchan (perhaps due to race).

Anyway, the real point is that a 'stat' wchan does not
now intentionally contain an address. Thus, outputting
'ffffff', '-' or '1' in programs like ps is senseless.

So this patch just eliminates PIDS_WCHAN_ADDR from our
item enumerators leaving only the PIDS_WCHAN_NAME guy.
Now the new library can't be blamed for bad addresses!

Reference(s):
. removed Item_table 'oldflags'
commit c4aa6c0ab4
. linux removal of wchan addresses
commit b2f73922d119686323f14fbbe46587f863852328

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-16 08:23:38 +11:00
Jim Warner
f3ec7f0032 top: make that 'forest view' just a tad more efficient
It makes no sense to begin our tracked nested level at
'1' then later require a '1' to be subtracted from the
level as artwork and indentation is added for display.

By beginning such tracked levels at zero, we can avoid
the need to adjust it & use it directly in a snprintf.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-16 08:23:38 +11:00
Jim Warner
7730bcf53d top: just cosmetic changes, absolutely no code altered
Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-16 08:23:38 +11:00
Jim Warner
ffeef98499 top: adapt for loss of fields obsoleted with linux 2.6
It would have been nice to remove this 'nDRT' guy from
the fields management screen and man document as well.
But, while this version of top could be made to handle
an older rcfile, the reverse would not have been true.

Besides, it's been zero for so long already we'll just
include a 'deprecated' note in top's man page for now.

[ the 'nTH ' field number was corrected in there too ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-09 21:31:29 +11:00
Jim Warner
86992bb58f ps: respond to loss of fields obsoleted with linux 2.6
Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-09 21:31:29 +11:00
Jim Warner
71bd5b6485 library <pids>: remove fields obsoleted with linux 2.6
It seems inappropriate to blindly include fields known
to always be zero in our brand new library. Therefore,
this patch removes support for three such enumerators.

[ that stat 'it_real_value' (PIDS_ALARM) field could ]
[ have been made obsolete before a linux 2.6 release ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-09 21:31:29 +11:00
Jim Warner
82a0dcda0f library: strictly cosmetic, absolutely no code changes
This commit just contains some tweaks to comments plus
a few adjustments to whitespace for alignment purposes
and a normalization of the header inclusion #define's.

[ plus a spelling error in one header file was fixed ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-10-09 21:31:29 +11:00
Jim Warner
9d1f6cb4ea library <stat>: added overlooked numa guest tic counts
When this module was upgraded to 3rd generation in the
patch referenced below, numa node support was migrated
from the top program into newlib. The 'guest_nice' and
'guest' tics were overlooked as top did not need them.

So, this commit corrects that oversight and achieves a
proper symmetry between the cpu & numa jiffies counts.

Reference(s):
. 3rd gen redesign, numa support imported
commit abc71a46ad

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-26 07:40:45 +10:00
Jim Warner
fe4a237bff misc: remove some newly introduced trailing whitespace
Maybe some folks still need a few .gitconfig tweaks to
catch the trailing whitespace errors a little earlier.

Or, at the least, after a local commit they should do:
$ git diff HEAD~1

[ and then check if git marks any with his red blobs ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-26 07:40:45 +10:00
Jim Warner
1a2b62c779 library: add priming read at 'new' time <most modules>
A priming read at 'new' time in that <slabinfo> module
was important so that permission problems are detected
early. Plus, it also had the potential of making delta
values valid when 'get' or 'select' were first called.

It is for that latter reason that such a read was also
incorporated in the <diskstats> module 'new' function.
No other module, however, employed such priming reads.

This patch just brings those potential benefits to all
of our other newlib modules with the exception of that
<pids> guy. That module is, of necessity, sufficiently
different from those others to justify such exclusion.

Not only are there precious few DELTA enums in <pids>,
but the costs of a priming read would be much greater.

[ otherwise, these newly added priming reads have no ]
[ measurable negative impact on performance/timings. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-21 21:06:12 +10:00
Jim Warner
5197fa0a71 library: summary name now more descriptive, <slabinfo>
The <slabinfo> header provides 3 groups of enumerators
with prefixes of SLABINFO, SLABS & SLABNODE. The first
is strictly user oriented & isn't supported internally
by any structure. The other two, however, have structs
associated with 'em but, unfortunately, 1 is misnamed.

The 'struct slabs_node' is associated with 'nodes' and
supports the enumerators with the SLABNODE prefix. But
the 'struct slabs_hist' was associated with 'hist' yet
supports those enumerators with just the SLABS prefix.

We do not care very much what some structure is called
but we do care about an identifier used manipulate it.

This patch will trade the 'hist' identifier associated
with 'struct slabs_hist' for a more congruous 'slabs'.

[ it's awful when the author can't remember what the ]
[ true meaning of an identifier is after creating it ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-21 21:06:12 +10:00
Jim Warner
eeeba3e66c library: improve support of dynamic numa nodes, <stat>
If, in fact, numa nodes are dynamic (like that current
total of on-line cpus) the existing logic was lacking.
It included an early return before checking the total.

So, this commit ensures that the nodes total is always
set or updated consistently in only a single function.
There's no need to set it at the time 'new' is called.

[ and since under our existing code this nodes total ]
[ could never possibly have been zero, the erroneous ]
[ test (with the early return) has now been whacked! ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-21 21:06:12 +10:00
Jim Warner
a5ec5efc9a top: remove explicit references to NUMA_DISABLE define
Since our library is responsible for NUMA support, and
since the top program already accommodates the lack of
NUMA data, there's no reason that #define NUMA_DISABLE
need be explicitly referenced in the top source files.

Ergo, this commit just eliminates all such references.
Now, top will rely only on procps_stat_reap() results.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-21 21:06:12 +10:00
Jan Rybar
b9050f69a0 NOTES now contain mention of sysctl(8) 2016-09-21 20:46:01 +10:00
Jim Warner
fe3c8d74bc NEWS: updated with most recent copy from master branch
This just brings the newlib branch NEWS into line with
the current version from our master branch since those
changes have already been incorporated in this branch.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-18 20:37:24 +10:00
Jim Warner
91d47123f2 library: finally circumvent libnuma memory leak <stat>
Still unhappy with a minor memory leak associated with
libnuma, I experimented with omitting the dlclose that
was issued at module's end. For some reason which will
remain a mystery, the valgrind leak then went bye-bye.

So this patch just omits one use of dlclose and relies
on whatever kernel magic is at work to free the memory
when each process ends. We kept, however, the original
code (now commented-out) to serve as a future caution.

There remains one potential (but unlikely) dlclose use
near the original dlopen. But there will be no leak as
that 'numa_node_of_cpu' will not yet have been called.
This seems to be the culprit that triggers such leaks.

None of this libnuma shit would likely have come close
to hitting our fan had the numa developers provided us
with 'new' and 'unref' functions like our newlib does.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-18 20:37:24 +10:00
Craig Small
a8f7e44233 docs: Remove old library man pages 2016-09-11 11:20:03 +10:00
Craig Small
34d040a079 pgrep: add warning that pattern exceeeds 15 chars
Add a warning if you specify a command over 15 characters and don't
use the -f command.

This is a pick of two patches from master:
 24fd260 pgrep: Fix off by one error in line check
 4a7f9fc pgrep - adds warning that pattern exceeds 15 chars without

References:
 !25
2016-09-11 10:40:47 +10:00
Olof Sivertsson
95ed10ff43 kill: Fix free() with bad pointer on SIG-prefixed signal-name
kill -l SIGHUP (or any other signal-name prefixed with "SIG")
would cause free() to be called with a bad pointer instead of
a pointer to what was allocated. Fix this and add test-case.
2016-09-11 09:58:55 +10:00
Jim Warner
e02d9f554d pmap: fix printing bug associated with the '-x' option
Ever since its introduction, the 'x' (extended format)
option has employed strncmp to parse those smaps keys.

Such an approach worked well as long as those prefixes
were guaranteed to be unique. But, with the 4.3 kernel
a new 'SwapPss' field was added to those within smaps.

That triggered a 2nd match for the 'Swap' logic which,
in turn, resulted in a duplicate output line of zeros.

So this patch just trades strncmp for strcmp, avoiding
potential future problems when /proc/$$/smaps evolves.

Reference(s):
. recent bug report
https://bugzilla.redhat.com/show_bug.cgi?id=1374061
. linux 4.3 kernel introduces SwapPss
commit 8334b96221ff0dcbde4873d31eb4d84774ed8ed4
. original pmap -x option introduction
commit 380cc1e908

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-11 09:31:05 +10:00
Jim Warner
834ed434c9 library: normalize stack and history allocation naming
Recent profiling and timings have resulted in improved
newlib performance. This patch completes that process.

It just normalizes naming conventions employed for all
allocations involving reaped stacks & history support.

The modules offering a 'reap' function will also offer
the now standardized corresponding STACKS_INCR define.

The modules which provide dynamic history support will
now have a separate #define called NEWOLD_INCR used in
allocations/reallocations. And, while values currently
are set equal to that STACKS_INCR value, in the future
some reason for divorcing those two may be discovered.

----------------------------- for future reference ---

In those modules which contain the STACKS_INCR #define
it is tempting to specify a large value so as to avoid
repeated calls to malloc/realloc. However, in doing so
an extra runtime price will be paid in 'cleanup_stack'
calls with any iterative programs like top or slabtop.

So, with the current values a balance has been sought.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-11 09:31:05 +10:00
Jim Warner
793ada6ec5 top: correct comments & code regarding sysinfo_refresh
This commit just brings some comments plus identifiers
into agreement with the current newlib implementation.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-09-11 09:31:05 +10:00
Jon Boden
6f8c101e2e library: Don't use SIGPWR on FreeBSD
FreeBSD doesn't have SIGPWR so makes no sense in warning and assuming
its 29.

Picked from master, but the file has moved from proc/sig.c to
library/signals.c

References:
 commit 8abd0c92ab
 https://bugs.debian/org/832148

Signed-off-by: Craig Small <csmall@enc.com.au>
2016-08-28 19:19:05 +10:00
Jim Warner
b53fb7f8ea top: avoid yet more overhead of accessing /proc/status
After discovering those terrible costs associated with
/proc/status vs. /proc/stat, our library changed so as
to favor the latter if a field could be met by either.

Well, low-and-behold, this top program had chosen some
item enumerators that needlessly caused 'status' to be
accessed when 'statm' could be used instead. And while
top's needs require conversion from pages to KiB, that
is still far less costly than that damn 'status' file.

[ this was found when comparing newlib top against a ]
[ 3.2.8 ancient top since the current master top was ]
[ suffering from the exact same 'status' deficiency. ]

[ and, no way was top-3.2.8 going to beat newlib top ]
[ by 50% - we'll allow only a 1-10% occasional loss! ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-08-23 21:11:09 +10:00
Jim Warner
3ac040d047 library: revert one ancient 'escape_str_utf8' deletion
Profiling revealed a large amount of time spent in the
'escape_str_utf8' function (escape.c) with both of our
NLS branches (newlib and master). That same result was
not seen under an ancient top-3.2.8 program & library.

Well, the 3.2.8 result was ultimately explained by the
absence of a 'setlocale', necessary under NLS support.
Thus, when that ancient library tested for locale, all
it got was 'ANSI_...' & assumed 'UTF-8' wasn't active.

But after a hack to that ancient code to place it on a
par with newlib/master, I still found cost differences
that led me to revisit an old change referenced below.

It turns out that 'iswprint' costs far more than would
a call of 'isprint', even with the extra support code.
So this commit just reverts that five year old change.

Reference(s):
commit 7b0fc19e9d

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-08-23 21:11:09 +10:00