Re: [PATCH v2] mm: oom_kill: add trace logs in process_mrelease() system call

[Pratyush Brahma]

On 17-08-2022 06:05, Andrew Morton wrote:
> On Tue, 16 Aug 2022 11:30:17 +0530 Pratyush Brahma <pbrahma@xxxxxxxxxxxxxxxx> wrote:
>
> > The process_mrelease() system call[1] is used to release the memory of
> > a dying process from the context of the caller, which is similar to and
> > uses the functions of the oom reaper logic. There exists trace logs for
> > a process when reaped by the oom reaper. Just extend the same to when
> > done by the process_mrelease() system call.
> Why?  Please describe in full detail the end-user value of this change.

This patch provides information on how much memory is freed from a process
which is being reaped. Adding trace events in the process_mrelease() path when
process is being reaped would enable more holistic debug as it happens in
oom_reap_task_mm() currently.

This extends the debug functionality for the events as described in [1] to
the process_mrelease() system call. Now the coverage of trace events is complete.

[1]
https://lore.kernel.org/all/20170530185231.GA13412@castle/T/#u