I sure hope we won't disappoint the library with these
changes since we're only exploiting one of the two new
enumerators that the immediately prior patch provided.
Now top will be able to offer a visual clue as to each
cpu (thread actually) core association. Is it a P-core
offering multiple threads or a single threaded E-core.
We'll accomplish this feat with a subtle change to the
states portion ('t' toggle) of the summary area. Where
before processors were represented as 'Cpu', they will
now be displayed as 'CpP' (P-core) and 'CpE' (E-core).
[ assuming that new '5' command toggle has been used ]
There are also new provisions for filtering those cpus
by their core type association via the new '5' toggle.
Signed-off-by: Jim Warner <james.warner@comcast.net>
With Intel's 12th generation Alder Lake processors now
providing two distinct types of core, it would be nice
if the library offered some sort of clue to core type.
Well, with this patch it does. We'll have 2 additional
enumerators. One deals with the cpu's core association
and the other provides the type of that core (P or E).
[ now, all we need is for some program to exploit it ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
When that 'Bottom' window was being finalized, an enum
of BREAK_screen was added to the Frames_signal values.
This was done so some full screen replacement function
could flag the need for that bottom window to go away.
Around that same time, top was made more responsive to
keyboard input so that residual portions of a previous
bottom window would not linger until the next refresh.
This happened if going from a larger (^N, environment)
bottom window to some smaller window (^P, namespaces).
The combined effect of these changes was to create the
potential race condition this commit addresses. If the
user encountered a SIGWINCH while on any of those full
screen replacement displays (help, fields mgmt, etc.),
endless redraws would occur. A ^C was the only option.
Henceforth we will protect against any redraw loops by
clearing Frames_signal each time a redraw is required.
[ along the way, we'll make the 'q' key work on that ]
t secondary 'windows' help screen as it should, even ]
[ though it is not documented on that screen itself. ]
Reference(s):
. May, 2022 - more responsive to keyboard input
commit 3ea1bc779f
. May, 2022 - maybe force the bottom window off
commit d66c1f39b5
Signed-off-by: Jim Warner <james.warner@comcast.net>
Darn, after testing on some older, out of date distros
I was embarrassed to find some awful code I created in
the commit shown below. I was rewarded with some 'nan'
floating point values and 'inf' computational results.
Reference(s);
. a missed opportunity to repent
commit 5c5bff392b
. true source of my original sin
commit 2d5b51d1a2
Signed-off-by: Jim Warner <james.warner@comcast.net>
If one per line display of Mem/Swap data was forced by
this #define, screen width was not fully exploited for
graph mode. Rather, those graphs were scaled just like
they would be if aligned with a nonexistent separator.
With this commit, those graphs will expand to fill the
screen width (or be limited by the maximum of '100' ).
[ and in unrelated news a variable used in do_memory ]
[ was changed for consistency. it doesn't affect the ]
[ the results since a part1 of swap was always zero. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
This patch introduces a new #define TOG4_MEM_FIX which
serves to turn off the new feature it also implements.
The feature, on by default, provides a flexible memory
graph approach which strives to always keep its visual
separator in alignment with cpu separators seen above.
Below is a summary of the algorithm implementing this:
1) First, ascertain the widest graph which corresponds
to the largest number of cpu graphs but doesn't exceed
maximum allowable graph width (i.e. GRAPH_length_max).
2) Next, apply that to the graphed 'Mem' portion which
is likely to remain entirely visible. However, it will
grow or shrink depending on total adjacent cpu graphs.
3) Last, the same width is used for the 'Swap' portion
but that graph is considered sacrificial and very well
could be truncated depending on the width of a screen.
[ along the way, when the cpu graphs revert to their ]
[ abbreviated form, the memory graphs will also show ]
[ an abbreviated prefix. in this way the widths will ]
[ also be maximized, reducing potential distortions. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit will change some comments, adjust a little
whitespace but mostly rename some #define identifiers.
Signed-off-by: Jim Warner <james.warner@comcast.net>
When displaying detailed memory statistics two abreast
data for the lines are less than those for cpus. So we
can exploit such a difference to provide a distinctive
separator. This may help separating cpu & memory data.
[ in truth, this happened before this patch. what we ]
[ are doing now is polishing that accidental feature ]
[ and placing it under the control of a conditional. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
When displaying detailed cpu statistics, as opposed to
those scalable graphs, only two per line can be shown.
Therefore, if we are showing a detail version, our '4'
toggle must prematurely revert to single mode display.
Conversely, the 't' toggle must also turn off that '4'
toggle rather than try to print more than 2 abreast if
we're currently executing in detailed statistics mode.
Signed-off-by: Jim Warner <james.warner@comcast.net>
When more than two cpus are displayed per summary area
line in graph form, those memory graphs were scaled to
that same width for consistency & aesthetics. However,
they probably shouldn't have been reduced to less than
terminal width due to a resulting loss of information.
[ after all, detailed memory stats are never reduced ]
So now, supporting logic was refactored to behave just
as it did before the 4 toggle was expanded beyond '1'.
[ the changes impact the 2 memory graphs exclusively ]
Reference(s):
https://www.freelists.org/post/procps/top-enhancements-2-bugs-swatted,1
Signed-off-by: Jim Warner <james.warner@comcast.net>
This patch just supplements the previous series with a
few minor tweaks representing some diverse objectives:
. a recent date for man page (which i always overlook)
. improved length calculations to maximize graph width
. a proper response to platforms with less than 8 cpus
. more consistency and readability with one blank line
Signed-off-by: Jim Warner <james.warner@comcast.net>
Well, here it is. This is what the preceding series of
commits was leading to: an ability to show up to eight
cpus per Summary Area line. In reality, a self imposed
limit of four cpus on such lines seems more realistic.
In any case, the new capability could also be employed
along with that '!' toggle which consolidates adjacent
cpus into a solitary graph. When used together the '4'
and '!' toggles should accommodate any number of cpus.
Signed-off-by: Jim Warner <james.warner@comcast.net>
I guess the cat's out of the bag with the prior commit
message. It mentioned the objective of displaying more
than the current two cpu graphs on summary area lines.
On the way to that objective, this patch just prepares
our battlefield for the actual implementation in which
up to 8 individual cpu graphs will be shown on 1 line.
[ no logic has been impacted with this commit. we're ]
[ just adding one manifest constant, trading several ]
[ identifiers and updating some comments so the next ]
[ commit might be just a little bit more manageable. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
This program has always been sensitive to the width of
a terminal/console. The detailed cpu/memory statistics
plus all of those full screen replacement windows were
designed to fit within some 80 column, 24 row display.
When a user narrowed a gui terminal to less than those
dimensions, top would simply truncate the data to fit.
However, when displaying cpu/mem graphs instead of the
detailed statistics such truncation was not justified.
After all, such graphs were already scaled to 80 cols.
Henceforth, when in graph mode, truncation won't occur
until the graphs will no longer fit within 10 columns.
[ can you keep a secret? this change is really being ]
[ made in anticipation of showing more than just two ]
[ cpu graphs in the summary area on each screen row! ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
The logic (illogic?) in the sum_tics() and do_memory()
functions has grown to become almost unfathomable over
time. Additionally, though perhaps not apparent in the
code, many steps are duplicated within those routines.
So, this patch refactors all the summary graph support
to consolidate duplicated code and (hopefully) make it
more understandable with an eye to future maintenance.
[ additionally, that show_special guy's workload has ]
[ been reduced by eliminating any special directives ]
[ previously embedded in some cpu graphs even though ]
[ a cpu may have been idle during the last interval. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
When 2 abreast cpu display was introduced, the minimum
screen width was 160 columns so as to avoid (minimize)
truncation. Later that was reduced to 80 columns while
keeping the original minimum as a compile conditional.
In preparation for (virtually) eliminating these width
restrictions in a future patch this #define's history.
Reference(s):
. May, 2020 - introduced #define TOG4_NOTRUNC
commit be3dcaa842
. May, 2020 - introduce 2 abreast display
commit 59f5a37a24
Signed-off-by: Jim Warner <james.warner@comcast.net>
When two abreast display was introduce, in that commit
shown below, this #define provision was also added. It
actually was an artifact left from program development
and never made much sense in a real world application.
If activated it would make the '4' toggle appear to be
broken since it would only take affect if a user first
activated individual cpu display (the '1' toggle off).
And there was no error message offered to those users.
So, this questionable #define is now being eliminated.
Reference(s):
. May, 2020 - introduce 2 abreast display
commit 59f5a37a24
Signed-off-by: Jim Warner <james.warner@comcast.net>
When top was made more responsive to keyboard input in
that commit referenced below, his previous response to
a SIGWINCH was upset. Formerly, that display integrity
was restored with the next refresh cycle. But, without
this patch, one must strike some key to accomplish it.
[ in truth, this patch vastly improves that sigwinch ]
[ response. whereas before, although integrity would ]
[ be restored automatically, it did not happen until ]
[ the next regular refresh. now it is instantaneous! ]
Reference(s):
. May, 2022 - made more responsive to kdb input
commit 3ea1bc779f
Signed-off-by: Jim Warner <james.warner@comcast.net>
Thanks to valgrind and his --track-origins=yes option,
the problem and solution was suggested as shown below.
[ and it was created in that commit referenced below ]
But, after attacking this problem by adding a memset()
call in pids.c, a 2nd valgrind oops, also shown below,
was encountered. The dynamically acquired 'cmd' again!
[ might help to explain why changes appear excessive ]
Reference(s):
. 1st valgrind discovery
==11111== Conditional jump or move depends on uninitialised value(s)
==11111== at 0x13425D: stat2proc (readproc.c:582)
==11111== by 0x137436: look_up_our_self (readproc.c:1613)
==11111== by 0x132196: fatal_proc_unmounted (pids.c:1388)
==11111== by 0x11BA4D: before (top.c:3580)
==11111== by 0x127E10: main (top.c:7173)
==11111== Uninitialised value was created by a stack allocation
==11111== at 0x132165: fatal_proc_unmounted (pids.c:1381)
. Jul, 2022 - fatal_proc_unmounted refactored
commit 52bd019d8c
. 2nd valgrind discovery
==22222== 16 bytes in 1 blocks are definitely lost
==22222== by 0x4A0E60E: strdup (strdup.c:42)
==22222== by 0x133D00: stat2proc (readproc.c:587)
==22222== by 0x136E67: look_up_our_self (readproc.c:1613)
==22222== by 0x131BC7: fatal_proc_unmounted (pids.c:1390)
==22222== by 0x11B7C6: before (top.c:3580)
==22222== by 0x127828: main (top.c:7173)
Signed-off-by: Jim Warner <james.warner@comcast.net>
Turn on trace() with the TRACE macro and remove the ## token paste
preprocessor operator which is unnecessary here and causes these errors:
ps/common.h:176:26: error: pasting "(" and ""ps_argv[thisarg] is %s\n""
does no t give a valid preprocessing token
.
Send trace output to STDERR.
Tracing can be enabled by adding TRACE to CPPFLAGS as follows:
./configure CPPFLAGS="-DTRACE"
Signed-off-by: Rafael Kitover <rkitover@gmail.com>
pgrep and friends naturally filter their own processes from their
matches. The same issue can occur when elevating with tools like sudo or
doas, where the elevating shim layers linger as a parent and are
returned in the results. For example:
% sudo pkill -9 -cf someelevatedcmdline
1
zsh: killed sudo pkill -9 -cf someelevatedcmdline
This is a situation we've actually seen in production, where some poor
soul changes how permission management works (for example with Linux's
hidepid option), needs to elevate a pgrep or pkill call, and now ends up
with more than they bargained for. Even after the issue is noticed,
resolving it requires reinventing some of the pgrep logic, which is
unfortunate.
This commit adds the -A/--ignore-ancestors option which excludes pgrep's
ancestors from the results:
% sudo ./pkill -9 -Acf someelevatedcmdline
0
We looks at multiple layers of the process hierarchy because, while
things like sudo only have one layer of shimming, some mechanisms (like
those found in a typical container manager like those found in Docker or
Kubernetes) may have many more.
Signed-off-by: Chris Down <chris@chrisdown.name>
This commit addresses a potentially disastrous flaw in
that fatal_proc_unmounted() function wherein requested
item(s) might not have been returned to the caller yet
were specified at the time of a 'new' or 'reset' call.
The root cause, uncovered by Craig, was due to the old
library look_up_our_self() support function which only
would populate a proc_t with limited 'stat' file data.
This routine will now act the same as all other <pids>
functions which return a stack or stacks. Whatever was
specified with a 'new' or 'reset' will be returned, if
the passed 'return_self' parameter is other than zero.
[ as is so often the case, when flawed code is fixed ]
[ former complexity can be reduced as a side benefit ]
Reference(s):
https://www.freelists.org/post/procps/issue-245-plus-one,2
Signed-off-by: Jim Warner <james.warner@comcast.net>
With the next commit the fatal_proc_unmounted function
will be refactored to behave as it always should have.
So, a need for the user 'stat' caution will disappear.
Reference(s):
. original man page change
commit 7d44c94317
Signed-off-by: Jim Warner <james.warner@comcast.net>
