Commit Graph

230 Commits

Author SHA1 Message Date
Jim Warner
270e8e7eeb top: standardize names of all 'helper' functions
The top program is carefully organized into sections
and those sections are carefully placed so as to avoid
the need for prototypes. *

Additionally, names of functions are carefully chosen
to maintain alphabetical order within each section.

The names of most 'helper' functions, which are always
placed immediately above the calling functions, often
only met the spirit of the alphabetical law, not the
actual letter of that law.

This commit alters the names of such helper functions
so as to mainatin strict ascii alphabetical order
within each section.

* the single exception to prototypes is find_string,
  which calls the task_show function, and would have
  prompted a massive reorganization.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2012-02-12 21:52:23 +11:00
Jim Warner
02508b3d76 top: use CPU_ZEROTICS to embrace the Nehalem logic
The recently added logic dealing with "missing" tics
is mutually exclusive with logic associated with a
define called CPU_ZEROTICS.

This commit expands the use of that define to exclude
such Nehalem logic as appropriate.

It also extends programmer notes in top.h to include
an attribution for initiating the topic of potential
Nehalem type % CPU distortions, acknowledging:
  Jaromir Capik, <jcapik@redhat.com>

References
commit ce1410a51a
commit 9e7dd43ab7
commit a9041a5526
2012-02-12 21:52:23 +11:00
James Cloos
95f2201730 top: postpone the switch from Kb to Mb in summary display
The mem and swap lines have enough room to show eight significant
digits, so switch to showing MB when >=100MB, not >=10MB.

The extra detail is valuable; it should not be elided.

Signed-off-by: James Cloos <cloos@jhcloos.com>
Signed-off-by: Jim Warner <james.warner@comcast.net>
2012-02-12 21:52:23 +11:00
Jim Warner
ce1410a51a top: fixup logic for Nehalem cpu 'idle' threshold
Due to a poorly constructed temporary fprintf
used during development, an earlier commit went
a little too far in its computations.  The net
result was the code looked nice but actually
accomplished nothing.

It is the /proc/stat line 1 (summary line)
whose tics must be used in establishing the
threshold boundary.  And that calculation
need be performed just once per frame.

This commit ensures one threshold calculation
per delay interval no matter how many cpus
are ultimately displayed.

It also corrects scalability by factoring in
the total number of online processors.

Reference:
commit 9e7dd43ab7
2012-02-10 07:01:10 +11:00
Jim Warner
9349100dd3 top: reduce use of 'clear_screen' to absolute minimum
Along the way to width override support (-w switch),
this top began clearing the screen far more often
than his predecessor.  In fact, it happend with each
user keystroke.

This commit dramatically reduces those occurances.
The screen will now be cleared only when an actual
SIGWINCH is received.

Thanks for identifying this flaw belongs to:
James Cloos, cloos@jhcloos.com

References:
http://www.freelists.org/post/procps/Merge-request

Blame:   c2dcbef482
Author:  Jim Warner <james.warner@comcast.net>
Date:    Thu May 26 11:33:32 2011 +0200
subject: added output width/height override support to top, + misc
2012-02-08 21:00:18 +11:00
Jim Warner
9e7dd43ab7 top: tweak the new 'reduce % CPU distortions' algorithm
The original approach to potential % CPU distortion due
to Nehalem type cores being turned off completely when
idle worked ok until the user typed something.

At that point, elapsed tics would no longer equal the
calculated value producing an undesirable 100% idle
condition until the next update or <Enter/Space> key.

This commit employs actual elapsed tics in determining
whether a cpu should be considered idle and thus makes
top's individual cpu display immune to user keystrokes.
2012-02-08 21:00:00 +11:00
Jim Warner
a9041a5526 top: reduce % CPU distortions when a core was turned off
This patch provides for cpu cores which can be turned
off completely when idle (Nehalem, etc.) thus registering
very few or no tics since the last update cycle.

When CPU_ZEROTICS is not defined (the default), any
displayed cpu with less than a certain amount of total
tics will show as 100% idle.  That amount is tempered
by the delay interval and total number of cpus.

This commit also satisfies the Debian 'top_nohz' patch
(11/24/09) in a slightly more efficient manner.  That
patch concerned kernels built with CONFIG_NO_HZ.

Reference:
http://www.freelists.org/post/procps/CStates-handling-new-switch,4
2012-02-08 20:57:58 +11:00
Jim Warner
f348575edc top: tolerate loss of smp cpus, improve CPU_t management
Prior to this patch, top was able to handle any hotplugged
cpus *added* to the system in two distinct ways.

 1) Newly added cpus would be detected by sysinfo_refresh
    calling the library's cpuinfo function, which occurs
    at most every 5 minutes.

 2) The user could force a refresh using either the
    <Enter> or <Space> keys.

Unfortunately, the *loss* of a cpu would produce an early
exit due to a /proc/stat read failure.  Such a failure
can be produced in the following way:
  sudo echo 0 > /sys/devices/system/cpu/cpu??/online

This commit allows top to tolerate the loss of cpus.
It also provides for more efficient CPU_t management,
especially for massively parallel cpu environments.

Note: Changes to the cpu compliment can produce a single
cycle distortion of cpu percentages.  Such distortion is
most visible when each cpu is being displayed.  It can
be eliminated with a forced refresh via <Enter>/<Space>.
2012-02-08 20:57:51 +11:00
Jim Warner
d7c986cd30 top: treat additional keys like the find_string() keys
With the introduction of the 'locate string' provisions,
the precedent for calling tertiary helper functions from
secondary do_key helper functions was established.

This commit simply migrates some additional keys out of
the do_key function itself and into the more generalized
key table.
2012-02-08 20:57:44 +11:00
Jim Warner
0c6aa6af41 top: improve USE_X_COLHDR effect when colors toggled off
Normally, when the chosen sort column is displayed via the
'x' command toggle the entire column is highlighted.  And
while this version of top substantially reduced the cost
of such highlighting, a small pathlength increase remained.

The USE_X_COLHDR define was an experimental alternative which
eliminated all recurring runtime costs for such emphasis by
highlighting the column header, not the entire column.

The previous implementation required colors to be turned on
(the 'z' toggle) for such highlighting to be visible.  This
commit extends column header emphasis to include monochrome
displays as well.

Reference:
http://www.freelists.org/post/procps/post-nls-merge,6
2012-02-08 20:57:38 +11:00
Jim Warner
9573a6fe5b top: properly handle an improper $HOME environment variable
Since its inception, this top has improperly handled an
empty HOME environment variable.  Under those conditions
a path to the root directory would have been constructed.

That caused no real harm upon startup since the display
defaults would have been employed.  However, except for
root, it would have been impossible to save the rc file.

This commit keeps the promise made in the documentation.
2012-02-08 20:57:30 +11:00
Jim Warner
b73a423cc2 top: avoid %cpu distortions when toggling task/thread modes
This commit addresses a long standing buglet (debian #441166) which
surfaces when the display mode is switched between task and threads.

An extra procps refresh is now forced upon such a transition which
parallels the approach used at startup for the exact same reason.

Reference: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=441166
2012-01-14 00:04:46 +11:00
Jim Warner
7a64b0cd6c top: add PACKAGE and LOCALEDIR to ATEOJ_RPTSTD output 2012-01-05 09:56:05 +11:00
Jim Warner
e64b6f70d7 top: update some programmer documentation (no logic, just comments)
This commit corrects some outdated programmer comments.

Additionally, certain nls justifications might become
increasingly obscure with the passage of time so some
previous nls commit text has been added as comments.
2012-01-04 08:58:54 +11:00
Jim Warner
f38c42ff21 top: final cleanup following nls conflict resolutions
This patch represents the final resting place for miscellaneous
changes not otherwise encountered or for which the resolution
was incomplete or incorrect.
2011-12-22 23:48:06 +11:00
Jim Warner
c465dca573 top: adapt 'locate/find next' search capability for nls 2011-12-22 23:48:06 +11:00
Jim Warner
2246663f66 top: changed 'err' to 'errmsg', avoid conflict with <err.h> 2011-12-22 23:48:06 +11:00
Jim Warner
cb3b040718 top: repositioned nls.h to avoid redefine of procps.h restrict 2011-12-22 23:48:05 +11:00
Jim Warner
04e3ec75dd top: idiot! sometimes nls was misspelled nsl (but not anymore) 2011-12-22 23:48:05 +11:00
Jim Warner
bc441a67ea top: added additional xgettext strings plus translator hints 2011-12-22 23:48:05 +11:00
Jim Warner
67034a9a4a top: finalized nls translation implementation 2011-12-22 23:48:05 +11:00
Jim Warner
3d1f469995 top: restored static to scat(), not needed in top_nls.c 2011-12-22 23:48:05 +11:00
Jim Warner
26b4e0e1c6 top: optimization for show_special function 2011-12-22 23:48:04 +11:00
Jim Warner
617d46633e top: redesign Uniq_nlstab/show_special (nls quirks)
Until this patch, top had used some strings with
special escape sequences to produce colors, normal
text, bold text, etc.  They took the following form,
explained by an excerpt from program comments:
  ...
  Our special formatting consists of:
     "some text <_delimiter_> some more text <_delimiter_>...\n"
  Where <_delimiter_> is a single byte in the range of:
     \001 through \010  (in decimalizee, 1 - 8)
  and is used to select an 'attribute' from a capabilities table
  which is then applied to the *preceding* substring.
  ...

Unfortunately, these nonprinting values revealed
insurmountable inconsistencies in both the front-end
and back-end translation tools.

The xgettext (extraction) program would take those
special escapes, convert them and then output raw
binary values.  Thus the .pot file would contain
lots of unprintable stuff making it unreadable.

If the following was added to po/Makevars, most of
those special escapes would be preserved in their
escape notation:
  XGETTEXT_OPTIONS = ... --escape
But two escapes were converted from octal notation
and there was no way to prevent it:
  \007  -->  \a
  \010  -->  \b

After a pass through the msginit program, most of
the escapes were reconverted to raw binary values
making translation impossible.  There was no
"--escape" option for the back-end programs like
there was for xgettext.

But the real killer was the escape \004, also used
in some of top's special strings.  This value would
be silently accepted by xgettext, only to produce
the following fatal error in back-end programs like
msginit, msgfmt and msgen:
  .pot:2647: context separator <EOT> within string

To quote from one of the references below:
  "Would you create a suite of tools that silently
   allow what is destined to become a fatal error
   to pass unnoticed?"

So the bottom line was: top's special strings, in
use for the past nine years, had to be redesigned.

References:
http://www.freelists.org/post/procps/procpsng-nls-support,11
http://www.freelists.org/post/procps/procpsng-nls-support,14
2011-12-22 23:48:04 +11:00
Jim Warner
090923e546 top: shortened some of the longer lines, mostly nls 2011-12-22 23:48:04 +11:00
Jim Warner
18fc0b963d top: use existing unsigned vs. separate int 2011-12-22 23:48:04 +11:00
Jim Warner
eac96c37b5 top: corrected several programmer comments 2011-12-22 23:48:04 +11:00
Jim Warner
82c0dfd877 top: fix misapplied 'rh analysis #2: top' patch 2011-12-22 23:48:04 +11:00
Jim Warner
3f7468082a top: finalized top nls support (or so he thought)
summary of changes:
. adopted relative paths to 'include' and 'proc'
  dirs so that stand alone compiles are made
  easier and no one need guess their locations

. corrected several names for enums and macro
  usage reflecting fmt vs. txt

. expanded all octal escape sequences to a full
  3 digits since one already required 3 digits

. finalized translator hints (for now)

programming note:
  as an aside, by not including an argument for
  the gettext --add-comments, any preceeding c
  style comment will be propagated to the .pot
  file, if the gettext macro isn't empty.

  /* Need Not Say 'TRANSLATORS' ...
  snprintf(buf, sizeof(buf), "%s", _(   // unseen
  /* Translator Hint: ...
  snprintf(buf, sizeof(buf), "%s", _("" // seen
2011-12-22 23:48:04 +11:00
Jim Warner
32a9adbc13 top: provide extensive, generalized nls support
Reviewed-by: Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Jim Warner <james.warner@comcast.net>
2011-12-22 23:48:04 +11:00