linux-kernel - Re: [RFC PATCH v2 5/7] mm, oom: introduce oom_score

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Message-ID: <20170604193954.GC19980@esperanza>
Date:   Sun, 4 Jun 2017 22:39:54 +0300
From:   Vladimir Davydov <vdavydov.dev@...il.com>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        kernel-team@...com, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 5/7] mm, oom: introduce oom_score_adj for memory
 cgroups

On Thu, Jun 01, 2017 at 07:35:13PM +0100, Roman Gushchin wrote:
> Introduce a per-memory-cgroup oom_score_adj setting.
> A read-write single value file which exits on non-root
> cgroups. The default is "0".
> 
> It will have a similar meaning to a per-process value,
> available via /proc/<pid>/oom_score_adj.
> Should be in a range [-1000, 1000].

IMHO OOM scoring (not only the user API, but the logic as well) should
be introduced by a separate patch following the main one (#6) in the
series. Rationale: we might want to commit the main patch right away,
while postponing OOM scoring for later, because some people might find
the API controversial and needing a further, deeper discussion.