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Date:   Fri, 1 Dec 2017 18:13:53 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Tejun Heo <tj@...nel.org>, kernel-team@...com,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v13 6/7] mm, oom, docs: describe the cgroup-aware OOM
 killer

On Fri 01-12-17 17:01:49, Roman Gushchin wrote:
[...]
> diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
> index c80a147f94b7..ff8e92db636d 100644
> --- a/Documentation/cgroup-v2.txt
> +++ b/Documentation/cgroup-v2.txt
> @@ -1049,6 +1049,9 @@ PAGE_SIZE multiple when read back.
>  	and will never kill the unkillable task, even if memory.oom_group
>  	is set.
>  
> +	If cgroup-aware OOM killer is not enabled, ENOTSUPP error
> +	is returned on attempt to access the file.
> +
>    memory.events
>  	A read-only flat-keyed file which exists on non-root cgroups.
>  	The following entries are defined.  Unless specified
> @@ -1258,6 +1261,12 @@ OOM Killer
>  Cgroup v2 memory controller implements a cgroup-aware OOM killer.
>  It means that it treats cgroups as first class OOM entities.
>  
> +Cgroup-aware OOM logic is turned off by default and requires
> +passing the "groupoom" option on mounting cgroupfs. It can also
> +by remounting cgroupfs with the following command::
> +
> +  # mount -o remount,groupoom $MOUNT_POINT
> +
>  Under OOM conditions the memory controller tries to make the best
>  choice of a victim, looking for a memory cgroup with the largest
>  memory footprint, considering leaf cgroups and cgroups with the

Looks good to me

Thanks!
-- 
Michal Hocko
SUSE Labs

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