Commit Graph

178 Commits

Author SHA1 Message Date
Jim Warner
e2868da34e top: update copyright dates plus 1 preprocessor change
Signed-off-by: Jim Warner <james.warner@comcast.net>
2014-04-28 13:46:06 +02:00
Jim Warner
22e6582974 top: protect against distortion when system time reset
If a system's time is adjusted backwards, then elapsed
time could appear as negative. This yielded a negative
%CPU value. Alternately if zeros were suppressed ('0')
the result was a blank %CPU column. In both cases that
distortion would last for one display cycle or until a
user forced a display refresh via some keyboard input.

The original recommendation was trading gettimeofday()
for clock_gettime() using CLOCK_MONOTONIC. But on some
systems that might not be possible, forcing the use of
CLOCK_REALTIME instead. Not only would that complicate
the build system, but it may leave us with minus %CPU.

Another approach was to ensure that elapsed time could
never be negative. Of course, this produced distortion
of %CPU values but it would be proportionally correct.
This wasn't dissimilar to a distortion already present
should the time be adjusted forward or backward within
any 'remaining' top delay intervals. These aberrations
would be avoided with clock_gettime & CLOCK_MONOTONIC,
but that is a less than ideal solution as noted above.

This final solution, which originated down under, will
simply rely on the /proc/uptime seconds, which will be
immune to *any* tampering with the system clock. Thus,
we now have a fix for the distortion we didn't know we
suffered plus a negative %CPU that began this odyssey.

Thanks to:
sk.alvin.x@gmail.com, for the original effort
jcapik@redhat.com, for a heads up on CLOCK_MONOTONIC
csmall-procps@enc.com.au, for the best suggestion of all

Reference(s):
. original post/patch
http://www.freelists.org/post/procps/PATCH-top-use-clock-gettime-instead-of-gettimeofday
. heads up on CLOCK_MONOTONIC
http://www.freelists.org/post/procps/PATCH-top-use-clock-gettime-instead-of-gettimeofday,2
. the final solution
http://www.freelists.org/post/procps/PATCH-top-use-clock-gettime-instead-of-gettimeofday,11

Signed-off-by: Jim Warner <james.warner@comcast.net>
2014-04-28 13:46:06 +02:00
Yuri Chornoivan
2ec9f5c22e Minor i18n fixes
Minor fixes that the translator (Yuri) has found in some of the
strings. You only know how many typos and thinkos you have when
someone is trying to translate it.

Signed-off-by: Craig Small <csmall@enc.com.au>
2014-03-03 21:58:56 +11:00
Jim Warner
24f1fbd9d0 top: avoid name conflict in the next version of stdlib
Since its inception top has always used enumerators to
identify displayable fields. They've taken the form of
P_PID, etc. As it turns out, something has changed for
libc6-dev versions beyond 2.17-93 wherein 'P_PID' will
now be exposed via stdlib.h. I have not pinpointed the
exact cause but it may depend on header include order.

This patch just trades top's long standing 'P_' prefix
convention for that of 'EU_' (short for enumerator). I
cannot find *any* header under /usr/include/ currently
utilizing this particular three character combination.

And as a further safeguard top will henceforth include
'system' specific headers after the standard includes.

Reference(s):
http://www.freelists.org/post/procps/top-wont-compile-anymore

Signed-off-by: Jim Warner <james.warner@comcast.net>
2014-02-27 06:30:44 +11:00
Jim Warner
bcf4f5a830 top: restore the former behavior after stderr redirect
When top originally responded to the potential libnuma
stderr write, the library was consistently called with
each refresh cycle. That, in turn, guaranteed that any
warning message would be seen at program end by virtue
of: 1) having been issued before the 2nd refresh cycle
and; 2) benefiting from inherited /dev/null buffering.

A later efficiency refactor meant the numa library may
not always be called with every refresh cycle. Rather,
it was only called if top was in one of two numa views
(the '2' or '3' toggles). That, in turn, resulted in a
loss of any warning message at program end unless numa
mode had been preserved in the rcfile. In other words,
if top was started normally then a single cycle stderr
redirect would have long passed by the time the '2' or
'3' toggle was activated. The warning message actually
was spewed but quickly lost to the full screen refresh
which follows all keyboard interactions with the user.

This commit simply moves the restoration of our stderr
redirect to program end (instead of that first display
refresh). Now, any libnuma stderr warning message will
appear as the concluding output line upon quitting top
without regard to when any numa mode view was invoked.

And since this technique might be useful in some other
context (as an example of how to 'buffer' stderr) it's
been generalized with its own #define. But to maximize
its usefulness, the original redirect should be issued
much earlier in pgm startup than top has chosen to do.

Reference(s):
. original libnuma stderr response (msg seen)
commit 35dc6dcc49
. numa refractoring for efficiency (msg lost)
commit f12c0d5c6e

Signed-off-by: Jim Warner <james.warner@comcast.net>
2014-02-22 11:16:22 +11:00
Jim Warner
b6fcb602ce top: provide for discontinuous (not active) NUMA nodes
Apparently there are occasions when NUMA nodes may not
always be contiguous. Under such conditions nodes that
were not used would still occupy precious Summary Area
space showing 100% idle, under the '2' command toggle.

With this commit top will no longer display numa nodes
that have no associated cpu when the '2' toggle is on.
But just in case we wish to return to former behavior,
a new #define called OFF_NUMASKIP has been introduced.

And as an aside, a recent refactor mentioned below set
the stage for this patch to be 'self-tuning'. In other
words, if an inactive/non-displayed node should become
active (if even possible), then top will begin showing
such a node automatically with the next screen update.

Unfortunately, all inactive nodes now 'suppressed' are
still accessible via the '3' command. Those nodes will
just be displayed as empty (no associated cpus shown).
This is not really a top problem but more of a libnuma
and/or user deficiency. The library lacks the means to
validate a node id and the user then input a node that
was not even shown under a '2' toggle Summary display.

( too bad libnuma does not offer an 'is_node_active' )
( type function so top could warn a user when such a )
( discontinuous node was requested using his '3' cmd )

( sure, top could achieve this objective himself but )
( that would require making yet another array global )
( which i'm just not in the mood to do - besides, we )
( have already made enough concessions to libnuma.so )

Lastly, an existing #define (PRETEND_NUMA) was changed
to 'disable' node #1 so as to simulate a discontinuous
node. This allows testing of the '2' and '3' commands.

Reference(s):
http://www.spinics.net/lists/util-linux-ng/msg08671.html
. set stage for self tuning
commit f12c0d5c6e

Signed-off-by: Jim Warner <james.warner@comcast.net>
2014-01-20 19:10:22 +01:00
Jim Warner
14ef47af57 top: do not forget the fscanf %s terminating null byte
Reference(s):
http://www.freelists.org/post/procps/procpsng-339-defects-found

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-12-19 15:27:11 +01:00
Jim Warner
4c464acf28 top: follow usual name conventions for global variable
A recent change involving a one cycle stderr redirect,
to handle a libnuma potential transgression, failed to
follow normal global variable naming conventions. This
patch will capitalize the 1st letter of 'Stderr_save'.

Reference(s):
commit 35dc6dcc49

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-12-02 21:37:36 +01:00
Jim Warner
57ab5eed15 top: do not lie about purported alphabetical orderings
Excluding those special X_XON/X_XOF enums, which might
not even be present, restore strict collating order of
all the case labels in the task_show switch statement.

Also, adjust a few sort callbacks for the same reason.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-12-02 21:37:36 +01:00
Jim Warner
af4e6533ba top: increase the maximum number of displayable fields
The recent addition of namespaces, combined with those
potential suse out-of-memory fields, means that we are
close to the maximum number of fields poor ol' top can
display. Imagine, the really old top was limited to 26
fields (28 with the suse hack) and this top had neared
the version 'g' rcfile limits which were a healthy 55.

This patch adds another 15 fields to the maximum while
making it even easier to increase in the future. Also,
top still silently accommodates older config files all
the way back to the original pre-ng version top-3.2.8!

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-11-25 20:57:32 +11:00
Jim Warner
2aa0951d1b top: expand this program to include namespaces support
Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-11-25 20:57:32 +11:00
Jim Warner
89c2f28e39 top: eliminate yet more gcc subscript resolution bloat
This patch is inspired by the 'minimize numa overhead'
patch. It trades the use of subscripts for pointers to
avoid gcc repeated subscript offset calculation bloat.

Now, throughout the cpus_refresh function, a subscript
will be resolved just once & this will (dramatically?)
reduce the path-length taken for each and every frame!

For example, a non-optimized compilation could produce
400+ fewer machine instructions through pointer usage.

[ ok, optimized compiles only save 18+ instructions! ]

Lastly, any residual 'symmetry only' crap is now gone!

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-11-25 20:57:32 +11:00
Jim Warner
f12c0d5c6e top: minimize the statistics overhead for numa support
A recent libnuma potential corruption problem solution
has caused me to reevaluate some associated numa logic
for efficiency. Here is a summary of the problems that
exist with current libnuma/user possible interactions:

. Whenever the numa library was present extra overhead
would always be incurred in maintaining the node stats
even when the '2' or '3' commands were not being used.

. As part of such overhead a separate loop was used to
reinitialize each cpu/node structure with each display
cycle so that prior accumulated totals were preserved.
Again, it didn't matter if numa data was really shown.

This commit attempts to refocus on the 'critical path'
costs in a running top by optimizing for the occasions
when numa node data is not being displayed. Under such
conditions, no extra overhead will be incurred whether
or not a distribution has the libnuma library present.

To achieve this goal, some additional overhead will be
incurred, but only when actually displaying numa data.
And all such new costs have been minimized in spite of
the gcc inclination to duplicate subscript resolution.

Reference(s):
commit 24bd950cb2e1722d459461f0f9c0c30a4b9ffdaa

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-11-25 20:57:32 +11:00
Jim Warner
bdb2fe0056 top: add some flexibility to dlopen() for numa support
A recent libnuma potential corruption problem solution
suggests that libnuma could change in the future so as
to not spew to stderr. This then raises a question how
top could exploit any such library change since we are
currently locked into version #1 of the library by way
of our dlopen("libnuma.so.1", RTLD_LAZY) runtime call.

While not an ultimate solution, this commit will first
try for the most recent version of that library during
top's startup before trying the original libnuma.so.1.
We do this via the unqualified library soname symlink.

For this new dlopen() call to succeed, technically the
numa 'devel' package would usually have been required,
but that's not always true with every distro. And when
the libnuma.so symlink isn't present, it can always be
manually added should a newer & better behaved library
arrive & users tire of the stderr warning at top exit.

Reference(s):
commit 24bd950cb2e1722d459461f0f9c0c30a4b9ffdaa

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-11-25 20:57:32 +11:00
Jim Warner
35dc6dcc49 top: address some potential libnuma display corruption
There is a chance that the libnuma library may corrupt
top's display with some stderr warning messages in the
event something under /sys/devices/system/node/ cannot
be accessed. And, while 2 overridable 'weak' functions
are provided to alter such behavior, we can't use them
since top dynamically links to the library via dlopen.

This commit will redirect stderr to '/dev/null' during
just the first screen display cycle. Thus we can avoid
the corruption which would have remained visible until
the underlining screen row's data had finally changed.

Lastly, this patch should allow such a library warning
to actually appear when one finally exits our program.

[ i think the libnuma folks should consider changing ]
[ the error/warning interfaces to accommodate dlopen ]
[ rather than forcing something like the ugly kludge ]
[ we have employed or libnuma dependency on everyone ]

Reference(s):
https://bugzilla.redhat.com/show_bug.cgi?id=998678

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-11-04 16:00:42 +01:00
Jim Warner
e6a78f2745 top: swat bug impacting 'idle' mode & 'user' filtering
When Other filtering was introduced the nature of what
constituted a displayed row changed. No longer would a
task_show() call guarantee that another line is shown.
Rather, a non-empty string must have also been tested.

Unfortunately, when any task window was being filtered
for 'idle' mode or a particular 'user', the proc index
was incremented twice due to the perils of copy/paste.
Combining such an index increment with the new test of
task_show results works fine if filtering is inactive.

This was a particularly insidious bug which meant that
an adjacent task would be skipped whenever the current
task met 'idle' and/or 'user' filter criteria, and was
not otherwise excluded due to 'Other' filter criteria.

And, since it was the very next task that was ignored,
the bug was very susceptible to a window's sort order.
This could be illustrated when filtering on some user,
while sorting on PID. Then, toggling Forest View could
make otherwise unseen tasks appear and then disappear.

User workarounds are possible via interactive commands
trading the 'i' and 'u'/'U' provisions for the 'o'/'O'
other filtering capability thus avoiding an extra i++.
But that is certainly less than ideal and doesn't help
the 3.3.7 and 3.3.8 distorted command line provisions.

( this little buggie may end up costing me my pocket )
( protector, my coding badge & maybe even my cubicle )

Reference(s):
http://www.freelists.org/post/procps/Idle-elides-nonidle-processes
. bug originated with 'Other' filtering
commit 5edc6fb317

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-09-29 11:51:39 +10:00
Jim Warner
4141efaf13 top: restore the lost final newline when in Batch mode
This patch adds the final newline when exiting 'Batch'
mode. Interestingly, it has been missing since release
3.3.5 but undetected until the Redhat bugzilla report.

Reference(s):
https://bugzilla.redhat.com/show_bug.cgi?id=1008674

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-09-17 20:27:02 +02:00
Craig Small
5e4d9d5a92 Merge commit 'refs/merge-requests/2' of git://gitorious.org/procps/procps into merge-requests/2
Conflicts:
	uptime.c
2013-09-11 20:50:48 +10:00
Jim Warner
06c19f5ba4 top: swat bug affecting batch mode and width provision
Normally, the internally tracked 'Screen_cols' can not
exceed the lessor of 512 or actual screen width. There
was one case, however, where that 512 byte upper limit
was no longer properly imposed as it should have been.

When operating in 'Batch' mode the actual screen width
was allowed to be exceeded when the optional -w switch
was also used. But, it should never have exceeded 512.

This patch ensures the upper limit is always observed.

Reference(s):
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721204

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-08-30 22:08:26 +10:00
Jim Warner
819ede1a6b top: correct, improve and otherwise tweak configs_read
This patch addresses the four '-Wunused-result' errors
generated whenever an optimized compile is invoked. It
also made the configs_read() guy a little more robust.

In the process, some logic was rearranged slightly and
some comments were re-indented simply for consistency.

Reference(s):
warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result]
warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-08-30 22:08:25 +10:00
Jim Warner
80e6783436 top: modest efficiency change to message line handling
When the final solution for cursor positioning for all
^Z or ^C cases was introduced the revised placement of
message line management introduced with the window mgr
'screen' refactor was retained. Those two commits mean
that a former tgoto was no longer needed when clearing
that msg line or displaying the scroll coordinate msg.

This patch eliminates the tgoto employed by frame_make
while assimilating a now defunct show_scroll function.

Reference(s):
. final cursor positioning for ^Z or ^C
commit 46a1356219
. 'screen' window manager refactor
commit 0fe393ff27

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-08-30 22:08:25 +10:00
Jim Warner
46a1356219 top: correct cursor positioning for all ^Z or ^C cases
Some more (very obscure) conditions where a suspension
or program end might embed the shell prompt within top
output have been uncovered beyond the 2 already known.

We had already covered some suspend/end contingencies:
1. the users were using the 'fields management' screen
2. the users were prompted for any line oriented input

However, there remained some situations where ^Z or ^C
could still produce a misplaced cursor + shell prompt:
3. the 'g' command while waiting for the window choice
4. the 'W' command if about to overwrite an old rcfile
5. the '=' command when exploiting the Inspect feature
6. the period during which any error message was shown

But, even when all those bases are covered there still
remains a remote possibility that such interrupts will
occur during a top repaint cycle. So rather than throw
yet more code at these self-inflicted problems perhaps
it is better if we just throw in the proverbial towel.

Thus, I'll take the only sane approach and restore the
results expected ever since top's inception and before
scrollback buffers entered the picture. Namely, with a
^Z or ^C the cursor will be placed on the final screen
row. That usually means it will immediately follow the
last output line but it may follow many blank lines if
the user interrupts top when *not* on the main screen.

Reference(s):
. expanded repositioning (for line oriented input)
commit 33104a2bcc
. introduced repositioning (for fields management)
commit 5c974ff44d
. scrollback buffers (the cursor handling changes)
commit dedaf6e1a8

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-08-08 19:21:22 +02:00
Jim Warner
30e90e4269 top: tweak cursor state code to swat an obscure buglet
An obscure bug has been discovered where a 'W' with an
old rcfile, warning against overwrite, would display a
cursor that should normally be hidden. This followed a
user's reply. So some logic was rearranged just a bit.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-08-08 19:21:22 +02:00
Jim Warner
6967bf80a6 top: correct, improve or otherwise tweak some comments
Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-08-08 19:21:22 +02:00
Jim Warner
33104a2bcc top: cursor repositioning includes line oriented input
A recent patch introduced the ability to recognize the
need to reposition the cursor at suspension or program
end. There remained unmet 1 additional potential need.

This commit extends that ability to embrace line input
so that if a user issues ^Z or ^C while being prompted
the resulting shell output will no longer be embedded.

Reference(s):
http://www.freelists.org/post/procps/top-library-miscellaneous-tweaks,7
commit 5c974ff44d

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-07-02 14:49:46 +02:00
Jim Warner
25ed080eaa top: refine some miscellaneous signals interrupt stuff
This commit mostly justs renames a few identifiers but
it also will now suppress any end-of-job report if top
wasn't ended via the 'q' key convention (i.e. signal).

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-07-02 14:49:46 +02:00
Jim Warner
5c974ff44d top: enable screen contents preservation at end-of-job
The title of this commit is actually quite misleading.

Were it more accurate, it would at least mention a tty
emulator's scrollback buffer, which was the cumulation
of a long pursuit to reduce the SIGWINCH overhead when
a window manager carelessly floods an application with
that signal *while* a user is still resizing a window!

Disabling and enabling that scrollback buffer resulted
in the final top display replaced with original screen
contents, a phenomenon acknowledged at the time but it
also represented a user interface change which has now
produced the first request for return to old behavior.

After the SIGWINCH dust settled, another problem arose
regarding behaviors under the 'screen' window manager.
In response, top was refactored a bit to avoid display
corruption. That was before discovering 'screen' could
duplicate the scrollback buffer behavior top expected.

As it turns out, the 'screen' refactoring had probably
made scrollback buffer manipulation unnecessary. Still
one could argue that a window should not be allowed to
scroll while a constantly updating program was active.

The solution represented in this commit returns former
behavior at program end (retaining top's last screen).
And if we ever wish to disable scrollback buffers, the
associated logic was retained but made conditional. It
is not reflected in configure.ac but might be someday.

Lastly, this commit corrects cursor positioning when a
^C is issued under 'Fields Management' at any terminal
that didn't have a scrollback buffer (i.e. a console).

Reference(s):
https://bugzilla.redhat.com/show_bug.cgi?id=977561
http://www.freelists.org/post/procps/top-library-miscellaneous-tweaks,1
. screen program refactor
commit 0fe393ff27
. scrollback buffer disabled
commit dedaf6e1a8
. sigwinch management defines
commit adca737758
commit 4f33b6b8c5

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-07-01 19:10:57 +02:00
Jim Warner
b55f9b97db top: add the major version to dlopen of libnuma soname
When the plug-in approach to NUMA support was added, I
carelessly employed the compile-time linker convention
for naming the library. Technically this then required
the 'devel' package for NUMA support to be present for
the unqualified soname symlink to be available. Either
that or one must have manually created such a symlink.

This commit adds the missing major version to dlopen()
of libnuma.so.1 so simply having a more likely package
such as 'numactl' will enable both '2' & '3' commands.

References(s):
http://www.freelists.org/post/procps/top-NUMA-node-CPU-utilization-support,25
. initial dlopen support
commit edba932a7e

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-06-10 15:43:12 +10:00
Jim Warner
0fe393ff27 top: inoculated against a window manager like 'screen'
If top were invoked under the 'screen' window manager,
writing the terminfo string 'exit_ca_mode' at top exit
would not restore the display to the state existing at
the time top was started. That's what occurs normally.
The net result of that failure was a corrupted screen.

However, there is a 'screen' configuration option that
will produce proper 'rmcup' behavior, but it is off by
default. That screencr option is known as 'altscreen'.
I stumbled across this provision by cloning the screen
git repository then searching for references to 'cup'.

If 'altscreen on' had been in either the /etc/screenrc
or the $HOME/.screenrc configuration file, my poor old
top would never have been accused of such corruptions.
Of course, the Programming Gods decree that any simple
solution for our problem must always be revealed last.

So before discovering that rc option, another approach
was taken involving top only. With just a little extra
refactoring of top display logic he was made immune to
any such quirk in the implementation of 'smcup/rmcup'.

I always feel good about any enhancement that actually
reduces the total number of lines of code. Even though
this change involved mostly rearranging some logic, it
yielded one less line (can't judge by diffstat because
of braces & notes). Anyway, rather than requiring some
change to a screenrc file, now we are self-sufficient.

Reference(s):
  procps ---------------------------------------------
https://bugzilla.redhat.com/show_bug.cgi?id=962022
http://www.freelists.org/post/procps/top-procpsng337-no-screen-cleaning-at-exit,3
. top : disable tty scrollback buffer to improve SIGWINCH
commit dedaf6e1a8
  screen ---------------------------------------------
git://git.sv.gnu.org/screen.git
. Improve cursor store/restore on smcup/rmcup.
commit f95352946080be803b794c9f2733d8c809c1a39a
. Fix using alternate screen buffers in some cases.
commit ad56f746c6243d45124485d198d577bdbb78071c
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=558724

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-05-22 14:55:40 +02:00
Jim Warner
77abe18d01 top: revert %CPU and %MEM precision to former defaults
When summary & task area memory scaling was introduced
in release 3.3.6, the percentage columns were expanded
to provide 3 decimal places of precision. In hindsight
that may have been overkill, making those columns more
of a distraction than useful, with just too much info.

This patch will revert those columns to the former one
decimal place. And as was true, that decimal point may
be sacrificed depending on the number of cpus present.

And, in case anyone might prefer additional precision,
a build option can provide it (--enable-wide-percent).

Reference(s):
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=707648
http://www.freelists.org/post/procps/What-happened-to-my-top,1
commit 21e550bc08

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-05-19 09:40:42 +10:00
Jim Warner
ae102f359f top: reduce function call overhead in the NUMA support
Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-05-19 09:40:41 +10:00
Jim Warner
edba932a7e top: introduce a plug-in approach for the NUMA support
The NUMA/Nodes support in top has gone through several
evolutions (primarily dealing with build-sys options).
With this commit the library dependency issues are now
moot and the responsibilities for run-time loading and
dynamic linking are assumed by the top program itself.

Henceforth, if top is executed in an environment where
libnuma.so is present, top will offer such extensions.
Even more importantly, when a missing libnuma is later
installed, top will offer numa support auto-magically.
All NUMA/Node build-sys dependencies are thus removed.

The former NUMA_ENABLED define has become NUMA_DISABLE
should anyone wish to test user interface implications
in an environment that *does* have libnuma. It is also
represented as the ./configure option: --disable-numa.

Lastly, the 't' (View_STATES) toggle will be forced on
for sanity whenever the '1', '2' or '3' keys are used.

Reference(s):
. original idea from: Dr. Fink <werner@suse.de>
http://www.freelists.org/post/procps/top-NUMA-node-CPU-utilization-support,18
. original numa suppoort
commit 8d989c68c0

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-05-05 09:12:08 +10:00
Jim Warner
d16fd8e462 top: snapshot /proc/stat reads to minimize distortions
Almost forever, top has been accessing the /proc/stat/
directory one line at a time until either smp_num_cpus
was reached or (more recently) Screen_rows is reached.

When NUMA/Nodes support is enabled screen rows will no
longer serve as a limit because all cpus must be read.

With this commit, the entire /proc/stat/ directory can
be read at once so all statistics will be frozen. Thus
individual cpus will no longer keep "ticing" until top
gets around to accessing them via some separate fgets.

The distortion this commit eliminates was quite easily
seen when comparing old/new tops using: individual cpu
stats vs. cpu summary; a healthy delay interval of 3-5
seconds; manually synchronized update cycles (the hard
part); some system loading (maybe another top at -d0).

Additionally, this patch eliminates some long standing
unnecessary initialization made possible because of an
allocation via calloc. If some parts are never touched
by sscanf due to a kernel version, it's unnecessary to
repeatedly re-initialize those portions to zero again.

Reference(s):
. numa extensions added
commit 8d989c68c0
. useless initialization evolution (old to new)
commit e54c8239b1
commit 9278134e49
commit fd62123562
commit f348575edc

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-04-24 08:29:22 +10:00
Jim Warner
3ac09447e5 top: change number of emulated cpus from four to eight
With the addition of NUMA/Node support and the ability
to emulate such support even in the absence of libnuma
and numa.h, the maximum number of cpus top can emulate
was increased to make numa emulation more interesting.

( whew, that's an awful lot of "emulates", me thinks )

Reference(s):
commit 8d989c68c0

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-04-24 08:29:21 +10:00
Lance Shelton
8d989c68c0 top: program code changes, enable NUMA/Node extensions
This commit extends the top Summary Area cpu states to
include information on Non-Uniform Memory Architecture
nodes. It is based upon changes originally proposed by
Lance Shelton who was instrumental in the final patch.

With this change, the user will have new commands that
will provide alternatives to the individual cpu stats:

. '2' toggles between cpu & numa node summary displays
. '3' provides node summary and related cpu statistics

These extensions required some minimal system support.
Typically, the numactl package (and maybe libnuma-dev)
are all that's needed to show a single node which owns
all the processors. Failing that, or for slightly more
variety, top also offers a #define named PRETEND_NUMA.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Signed-off-by: Jim Warner <james.warner@comcast.net>
Signed-off-by: Lance Shelton <LShelton@fusionio.com>
2013-04-14 22:21:42 +10:00
Jim Warner
4aa917455c top: fix the bug affecting certain Find/Locate results
When 'Other Filtering' was introduced the idea of what
constituted a displayed row changed. No longer was any
call to task_show assured of consuming one screen row.
Now the determining factor was whether or not the rows
were empty. This worked Ok until a certain Find string
was active then the entire display could be corrupted.

With Find active, the task_show() function alters each
returned row while highlighting each visible match. If
the search was on a single byte value & matched at the
beginning of a row the match got overwritten with '\0'
which then appears empty upon return to window_show().
So that row would not be counted as having been shown.

This was best illustrated with a Find on a single ' '.

This patch will restore proper 'Find/Locate' behavior.

Reference(s):
commit 5edc6fb317

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-26 20:35:53 +11:00
Jim Warner
a6c5e31022 top: tweak 'Inspect' code for isolated edge situations
If the 'Inspect' feature was used to view a file which
contained binary (unprintable) data, and when the last
line for such a file was purely unprintable, then that
line length would be overstated by the terminal width.

This was also the occasion where valgrind might object
over potential reference to some unitialized value(s).
It was a harmless situation and somewhat rare to begin
with. Anyway this commit will eliminate the potential.

Additionally, supporting readfile logic was simplified
and the 'status line' bytes read is now more accurate.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-23 16:00:02 +01:00
Jim Warner
7b708ca334 top: rename a single Other Filter variable for clarity
There is a member of the osel_s structure called 'flg'
that is used to reflect whether a particular filter is
one of inclusion or exclusion (negation). So by golly,
from now on we'll refer to it as 'inc', and not 'flg'!

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-14 12:36:47 +01:00
Jim Warner
1a50f39971 top: fine tune (ie. fix) 'other filter' negation logic
Two too many of these '=' (cooks) spoiled top's broth.

There exists an unintentional variation on the classic
error: off-by-one. When a negation symbol is used with
top's new relational 'other filter' provision, one too
many 'matches' are excluded. This happened because top
covered only 2 of the 3 potential strcmp return codes.
When the strings were equal, they were simply dropped.

So this patch will uninvent that particular variation!

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 2c2c5f5cd2

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-07 17:55:20 +01:00
Jim Warner
2c2c5f5cd2 top: introduce relational operators with other filters
When I originally entertained thoughts of maybe adding
relational operators to the new 'Other Filter' feature
the programming challenges seemed just too great. Yet,
when Jaromir suggests its desirability it now suddenly
becomes a reality. Another of life's little mysteries!

At any rate what was already an extremely powerful new
feature is even better by several orders of magnitude!

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

References:
http://www.freelists.org/post/procps/top-beyond-infinity,1

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-06 14:37:40 +01:00
Jim Warner
5edc6fb317 top: enable other filtering via inclusion or exclusion
This change represents the extension of user filtering
based on inclusion or exclusion. However where 'U'/'u'
filtering provides an either/or choice, this extension
offers multiple choices applicable to multiple fields.

The 'inclusion' and 'exclusion' criteria can be freely
combined making a powerful tool to fine tune a display
and avoid clutter associated with uninteresting tasks.

I'm convinced it offers unimagined future flexibility!

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
http://www.freelists.org/post/procps/top-over-the-top,22
http://www.freelists.org/post/procps/top-over-the-top,8

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-04 18:46:34 +01:00
Jim Warner
5e4bade595 top: minor refactor in preparation for other filtering
While it's only documented (so far) in commit text and
an occasional email I've tried to maintain some coding
standards primarily for reference/navigation purposes.
They also served, I felt, as useful mental challenges.

Someday I will get around to formerly documenting them
but in the meantime here are the ones for this commit:

. functions are grouped into logical (i hope) sections
. functions & sections are ordered to avoid prototypes
. function names are alphabetical within every section

Thus, given those constraints/objectives, and in order
to prepare for an upcoming Other_Filter feature, a few
things had to be renamed and rearranged. Plus a couple
of other (unrelated) tweaks were made for consistency.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 270e8e7eeb
http://www.freelists.org/post/procps/PATCH-12-top-restore-terminal-state-on-exit,4

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-04 18:46:31 +01:00
Jim Warner
b9976f7056 top: finish the job of correcting the response to a ^Z
if top is suspended while on the 2nd level help screen
the <Enter> key is no longer honored. Thus, users must
use <Esc> to exit help and return to the main display.

Also, line input that was only partially complete when
suspended would still require one additional keystroke
before the read was aborted and the display refreshed.

Lastly, some user interactions might require two input
lines before an operation can be considered completed.
Thus the 2nd line offers another opportunity for users
to suspend top. Resumption would require an extra key.

These issues stem from 2 recent enhancements: preserve
the user context when signaled; complete input editing
with cursor movement keys, insert/overtype modes, etc.

With this patch, the <Enter> key is once again honored
on help screen #2 and partial reads are now completed.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
       bug reported
http://www.freelists.org/post/procps/top-over-the-top,25
       response to ^Z (partial solution)
commit 5c3fffcf28
       line input editing
commit 477b10c0bd
       preserve context with SIGWINCH
commit ba9092ad83

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-01 14:25:35 +01:00
Jim Warner
709785e20b top: add the field 'USED' to top's existing repertoire
After revisiting the issue of a new field, combining 2
existing fields (RES and SWAP), I've decided it indeed
makes sense. After all, with the vastly expanded field
capability and the ease of adding new fields, it would
save some precious horizontal screen real estate while
also eliminating some mental/manual user calculations.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
http://www.freelists.org/post/procps/top-enhancements-i-hope
http://www.freelists.org/post/procps/top-regression-reports

Signed-off-by: Jim Warner <james.warner@comcast.net>

 top/top.1     |   23 ++++++++++++++---------
 top/top.c     |   14 ++++++++++++--
 top/top.h     |    6 ++++++
 top/top_nls.c |    3 +++
 4 files changed, 35 insertions(+), 11 deletions(-)
2013-03-01 14:25:31 +01:00
Jim Warner
9dd7251ca3 top: consolidate logic dealing with resetting a window
This commit just gathers all the logic associated with
resetting/normalizing a single window in one function.

In the future, should the window structure be expanded
to support added functionality, the act of maintaining
it will have been made a little bit easier, hopefully.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-01 14:25:28 +01:00
Jim Warner
a458871cde top: make user's choice for insert/overtype persistent
When true line input editing with paste capability was
was re-introduced in the commit below, the concept for
the distinct insert/overtype mode was also introduced.
But such a distinction did not survive an <Enter> key.

With this commit, the cursor state is made persistent.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 477b10c0bd

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-01 14:25:22 +01:00
Jim Warner
6d0765a03c top: allow no input with the maximum task ('n') prompt
When both 'kill' and 'renice' commands were changed to
provide a default pid, the 'n' command (maximum tasks)
should have also changed to continue to accept just an
<Enter> key under the get_int function's new protocol.

This patch corrects that behavior, accepting no input.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 39f4067c66

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-03-01 14:25:15 +01:00
Jim Warner
5ee1286625 top: allow re-ordering of saved line input upon recall
The original implementation of input line recall keeps
strings in the order established when initially added.
With this commit, that has been changed so any matched
string moves to the top of the saved input line stack.

[ well technically not the top since that's occupied ]
[ by an 'empty' string which serves multiple masters ]

Thus, the most frequently referenced strings over time
will percolate up and remain the most easily recalled.
But just in case anybody prefers the strict historical
ordering, a #define can restore the original behavior.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 2efe275512

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-02-27 17:03:54 +01:00
Jim Warner
5c3fffcf28 top: improve the response to ^Z if awaiting line input
Now that line input offers users full editing freedom,
if top were to be suspended after issuing a prompt for
input, upon resumption an extra keystroke is necessary
to satisfy the outstanding read & refresh the display.

With this patch that extra keystroke is not necessary.

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
commit 477b10c0bd

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-02-27 17:03:51 +01:00
Jim Warner
d497b1025a top: some idiot broke 'idle' mode with u/U 'exclusion'
This patch fixes the single stinkin' source line which
was responsible for breaking the top idle-mode toggle.

Without this change, either 'u' or 'U' must be invoked
just once before the 'i' command would show something.

(yes, everything's perfectly justified once again but)
(i'm not very happy over the need for this damn patch)

Reference(s):
commit d04297843f

Signed-off-by: Jim Warner <james.warner@comcast.net>
2013-02-27 17:03:49 +01:00