Package: emacs;
Reported by: Rahguzar <rahguzar <at> zohomail.eu>
Date: Wed, 24 Jul 2024 17:23:02 UTC
Severity: normal
Found in version 29.4
Done: Paul Eggert <eggert <at> cs.ucla.edu>
Bug is archived. No further changes may be made.
Message #11 received at 72278 <at> debbugs.gnu.org (full text, mbox):
From: Rahguzar <rahguzar <at> zohomail.eu> To: Stefan Kangas <stefankangas <at> gmail.com> Cc: 72278 <at> debbugs.gnu.org Subject: Re: bug#72278: 29.4; Proced reports incorrect results with 16KB page size Date: Wed, 24 Jul 2024 22:40:53 +0200
Hi Stefan,
Stefan Kangas <stefankangas <at> gmail.com> writes:
> Rahguzar via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs <at> gnu.org> writes:
>
>> Dear Emacs Maintainers,
>>
>> I am using GNU/Linux on an Apple M2 processor using the Asahi Linux
>> project [1]. They provide a kernel with 16KB page size [2]. This causes proced
>> to show incorrect values for percentage memory (other memory related
>> attributes might also be affected). E.g. comparing with top I see that
>> value reported by proced is a quarter of that related by top.
>>
>> [1] https://asahilinux.org
>> [2] https://discussion.fedoraproject.org/t/switch-to-the-kernel-16k-variant/87711
>
> 1. What is the output of running this command?
>
> grep MemTotal /proc/meminfo
>
> Does that value seem right? Does that file make sense in general?
The value and the file generally look correct to me.
> 2. Copy this to a buffer somewhere, put point after the last
> parenthesis, and press `C-u C-x C-e':
>
> (pp (mapcar #'process-attributes
> (seq-take (list-system-processes) 5)))
>
> Please post the result back here.
>
> Could you also tell us which values in the resulting list are wrong
> (a.k.a. "different from top")?
The processes that end up in that list have memory footprint so small
that top ends up showing percentage memory as 0. I modified the snippet
to obtain 5 processes started by firefox:
(((args . "/usr/lib64/firefox/firefox")
(pmem . 3.018895533065192)
(rss . 727876)
(vsize . 17513856)
(thcount . 105)
(nice . 0)
(pri . 20)
(pcpu . 1.0718871382569872)
(etime 12 34487 450000 0)
(start 26260 56544 260000 0)
(ctime 0 8651 310000 0)
(cstime 0 393 900000 0)
(cutime 0 8257 410000 0)
(time 0 8799 330000 0)
(stime 0 2500 340000 0)
(utime 0 6298 990000 0)
(cmajflt . 83)
(cminflt . 10288762)
(majflt . 1571)
(minflt . 20999882)
(tpgid . -1)
(ttname . "")
(sess . 1239)
(pgrp . 1239)
(ppid . 1)
(state . "S")
(comm . "firefox")
(group . "azeem")
(egid . 1000)
(user . "azeem")
(euid . 1000))
((args . "/usr/lib64/firefox/firefox -contentproc -parentBuildID 20240712194222 -prefsLen 42067 -prefMapSize 262227 -appDir /usr/lib64/firefox/browser {6dc0e492-94e8-413e-83e0-ac2b970bde23} 1241 socket")
(pmem . 0.05839737689600688)
(rss . 14080)
(vsize . 576016)
(thcount . 6)
(nice . 0)
(pri . 20)
(pcpu . 5.359847034838214e-05)
(etime 12 34486 950000 0)
(start 26260 56544 770000 0)
(ctime 0 0 0 0)
(cstime 0 0 0 0)
(cutime 0 0 0 0)
(time 0 0 440000 0)
(stime 0 0 180000 0)
(utime 0 0 260000 0)
(cmajflt . 0)
(cminflt . 0)
(majflt . 9)
(minflt . 1669)
(tpgid . -1)
(ttname . "")
(sess . 1239)
(pgrp . 1239)
(ppid . 1241)
(state . "S")
(comm . "Socket Process")
(group . "azeem")
(egid . 1000)
(user . "azeem")
(euid . 1000))
((args . "/usr/lib64/firefox/firefox -contentproc -childID 1 -isForBrowser -prefsLen 42067 -prefMapSize 262227 -jsInitLen 234780 -parentBuildID 20240712194222 -greomni /usr/lib64/firefox/omni.ja -appomni /usr/lib64/firefox/browser/omni.ja -appDir /usr/lib64/firefox/browser {2280679f-70cf-4f2d-887a-33665cc52830} 1241 tab")
(pmem . 0.9880603908509892)
(rss . 238228)
(vsize . 22750640)
(thcount . 27)
(nice . 0)
(pri . 20)
(pcpu . 0.13563582493620777)
(etime 12 34486 810000 0)
(start 26260 56544 920000 0)
(ctime 0 0 0 0)
(cstime 0 0 0 0)
(cutime 0 0 0 0)
(time 0 1113 460000 0)
(stime 0 75 970000 0)
(utime 0 1037 490000 0)
(cmajflt . 0)
(cminflt . 0)
(majflt . 0)
(minflt . 1710810)
(tpgid . -1)
(ttname . "")
(sess . 1239)
(pgrp . 1239)
(ppid . 1241)
(state . "R")
(comm . "WebExtensions")
(group . "azeem")
(egid . 1000)
(user . "azeem")
(euid . 1000))
((args . "/usr/lib64/firefox/firefox -contentproc -childID 2 -isForBrowser -prefsLen 43016 -prefMapSize 262227 -jsInitLen 234780 -parentBuildID 20240712194222 -greomni /usr/lib64/firefox/omni.ja -appomni /usr/lib64/firefox/browser/omni.ja -appDir /usr/lib64/firefox/browser {c7fd5dcc-7f18-4677-8cd3-ff49efab3e75} 1241 tab")
(pmem . 0.10299173743477577)
(rss . 24832)
(vsize . 4366000)
(thcount . 28)
(nice . 0)
(pri . 20)
(pcpu . 0.0032487989036966473)
(etime 12 34486 770000 0)
(start 26260 56544 960000 0)
(ctime 0 0 0 0)
(cstime 0 0 0 0)
(cutime 0 0 0 0)
(time 0 26 670000 0)
(stime 0 6 580000 0)
(utime 0 20 90000 0)
(cmajflt . 0)
(cminflt . 0)
(majflt . 0)
(minflt . 2708)
(tpgid . -1)
(ttname . "")
(sess . 1239)
(pgrp . 1239)
(ppid . 1241)
(state . "S")
(comm . "Privileged Cont")
(group . "azeem")
(egid . 1000)
(user . "azeem")
(euid . 1000))
((args . "/usr/lib64/firefox/firefox -contentproc -childID 3 -isForBrowser -prefsLen 29688 -prefMapSize 262227 -jsInitLen 234780 -parentBuildID 20240712194222 -greomni /usr/lib64/firefox/omni.ja -appomni /usr/lib64/firefox/browser/omni.ja -appDir /usr/lib64/firefox/browser {77722f8d-f95f-4796-9765-00d7017c5796} 1241 tab")
(pmem . 1.0487306202000508)
(rss . 252856)
(vsize . 6381408)
(thcount . 31)
(nice . 0)
(pri . 20)
(pcpu . 0.48562684148940605)
(etime 12 34486 380000 0)
(start 26260 56545 350000 0)
(ctime 0 0 0 0)
(cstime 0 0 0 0)
(cutime 0 0 0 0)
(time 0 3986 600000 0)
(stime 0 651 720000 0)
(utime 0 3334 880000 0)
(cmajflt . 0)
(cminflt . 0)
(majflt . 5)
(minflt . 1335797)
(tpgid . -1)
(ttname . "")
(sess . 1239)
(pgrp . 1239)
(ppid . 1241)
(state . "S")
(comm . "Isolated Web Co")
(group . "azeem")
(egid . 1000)
(user . "azeem")
(euid . 1000)))
The percentage memory values in top for these processes are 12.1 0.2 4.0
0.4 and 4.2 so 4 times those returned by proced.
> Thanks in advance.
From discussion with Eli at the help-gnu-emacs thread I think there is
some hard coded assumption about 4KB page size in sysdep.c. E.g. here at
line 3741
pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
Thanks,
Rahguzar
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