linux-kernel - Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware OOM killer

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Message-ID: <CALvZod4TtA8myYSqCL87dDXfyk1qkYx+v-MO6nt-cA+bKTcGUA@mail.gmail.com>
Date:   Mon, 4 Sep 2017 10:32:37 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     Linux MM <linux-mm@...ck.org>, Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, kernel-team@...com,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware
 OOM killer

On Mon, Sep 4, 2017 at 7:21 AM, Roman Gushchin <guro@...com> wrote:
> Introducing of cgroup-aware OOM killer changes the victim selection
> algorithm used by default: instead of picking the largest process,
> it will pick the largest memcg and then the largest process inside.
>
> This affects only cgroup v2 users.
>
> To provide a way to use cgroups v2 if the old OOM victim selection
> algorithm is preferred for some reason, the nogroupoom mount option
> is added.

Is this mount option or boot parameter? From the code, it seems like a
boot parameter.