linux-kernel - Re: [PATCH] doc: memcontrol: add description for oom

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Message-ID: <87y2f63722.fsf@meer.lwn.net>
Date:   Mon, 01 Mar 2021 14:20:05 -0700
From:   Jonathan Corbet <corbet@....net>
To:     Yang Shi <shy828301@...il.com>, hannes@...xchg.org,
        mhocko@...e.com, guro@...com, shakeelb@...gle.com,
        akpm@...ux-foundation.org
Cc:     shy828301@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] doc: memcontrol: add description for oom_kill

Yang Shi <shy828301@...il.com> writes:

> When debugging an oom issue, I found the oom_kill counter of memcg is
> confusing.  At the first glance without checking document, I thought it
> just counts for memcg oom, but it turns out it counts both global and
> memcg oom.
>
> The cgroup v2 documents it, but the description is missed for cgroup v1.
>
> Signed-off-by: Yang Shi <shy828301@...il.com>
> ---
>  Documentation/admin-guide/cgroup-v1/memory.rst | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/admin-guide/cgroup-v1/memory.rst b/Documentation/admin-guide/cgroup-v1/memory.rst
> index 0936412e044e..44d5429636e2 100644
> --- a/Documentation/admin-guide/cgroup-v1/memory.rst
> +++ b/Documentation/admin-guide/cgroup-v1/memory.rst
> @@ -851,6 +851,9 @@ At reading, current status of OOM is shown.
>  	  (if 1, oom-killer is disabled)
>  	- under_oom	   0 or 1
>  	  (if 1, the memory cgroup is under OOM, tasks may be stopped.)
> +        - oom_kill         integer counter
> +          The number of processes belonging to this cgroup killed by any
> +          kind of OOM killer.

Applied, thanks.

jon