GNU logs - #63496, boring messages

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Subject: bug#63496: process-attributes returns incorrect start, etime, and pcpu attributes when run inside a lxc container
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in src/sysdep.c line 3475:
Lisp_Object boot = Ftime_subtract (now, uptime);

it calculates the boot time for linux based on the uptime. Inside lxc 
containers, /proc/uptime is the uptime of the container rather than of 
the host system. However in /proc/[PID]/stat, starttime is the time 
since system boot, of the host system, not since the container started. 
This leads to emacs computing incorrect values for start, etime, and 
pcpu for processes.

I think it should get the boot time from "btime" in /proc/stat, this is 
what ps does, which shows correct times for processes inside the 
container. If this sounds like an appropriate fix I'm happy to write and 
test a patch for it.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Scott Zimmermann <sczimmer@HIDDEN>
Subject: bug#63496: Acknowledgement (process-attributes returns incorrect
 start, etime, and pcpu attributes when run inside a lxc container)
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Subject: bug#63496: process-attributes returns incorrect start, etime, and pcpu attributes when run inside a lxc container
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Scott Zimmermann <sczimmer@HIDDEN>, Paul Eggert <eggert@HIDDEN>, Andreas Schwab <schwab@HIDDEN>
Cc: 63496 <at> debbugs.gnu.org
Date: Thu, 18 May 2023 14:12:03 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <0f761478-aeb5-d65c-2c92-67dba69076d1@HIDDEN> (message from
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> Date: Sat, 13 May 2023 19:57:08 +0200
> From: Scott Zimmermann <sczimmer@HIDDEN>
> 
> in src/sysdep.c line 3475:
> Lisp_Object boot = Ftime_subtract (now, uptime);
> 
> it calculates the boot time for linux based on the uptime. Inside lxc 
> containers, /proc/uptime is the uptime of the container rather than of 
> the host system. However in /proc/[PID]/stat, starttime is the time 
> since system boot, of the host system, not since the container started. 
> This leads to emacs computing incorrect values for start, etime, and 
> pcpu for processes.
> 
> I think it should get the boot time from "btime" in /proc/stat, this is 
> what ps does, which shows correct times for processes inside the 
> container. If this sounds like an appropriate fix I'm happy to write and 
> test a patch for it.

Paul and Andreas, any comments?

Patches to implement the change would be welcome, of course.

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Subject: bug#63496: process-attributes returns incorrect start, etime, and pcpu attributes when run inside a lxc container
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On 5/18/23 04:12, Eli Zaretskii wrote:
>> Date: Sat, 13 May 2023 19:57:08 +0200
>> From: Scott Zimmermann<sczimmer@HIDDEN>

>> I think it should get the boot time from "btime" in /proc/stat, this is
>> what ps does, which shows correct times for processes inside the
>> container. If this sounds like an appropriate fix I'm happy to write and
>> test a patch for it.

Thanks, that sounds good.

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