linux-kernel - Re: [v8 0/4] cgroup-aware OOM killer

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Message-ID: <20171002205552.3ygveyd7yrcvkz7u@dhcp22.suse.cz>
Date:   Mon, 2 Oct 2017 22:55:52 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Tim Hockin <thockin@...kin.org>, Roman Gushchin <guro@...com>,
        Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>, kernel-team@...com,
        David Rientjes <rientjes@...gle.com>,
        Linux MM <linux-mm@...ck.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Cgroups <cgroups@...r.kernel.org>, linux-doc@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [v8 0/4] cgroup-aware OOM killer

On Mon 02-10-17 13:24:25, Shakeel Butt wrote:
> On Mon, Oct 2, 2017 at 12:56 PM, Michal Hocko <mhocko@...nel.org> wrote:
> > On Mon 02-10-17 12:45:18, Shakeel Butt wrote:
> >> > I am sorry to cut the rest of your proposal because it simply goes over
> >> > the scope of the proposed solution while the usecase you are mentioning
> >> > is still possible. If we want to compare intermediate nodes (which seems
> >> > to be the case) then we can always provide a knob to opt-in - be it your
> >> > oom_gang or others.
> >>
> >> In the Roman's proposed solution we can already force the comparison
> >> of intermediate nodes using 'oom_group', I am just requesting to
> >> separate the killall semantics from it.
> >
> > oom_group _is_ about killall semantic.  And comparing killable entities
> > is just a natural thing to do. So I am not sure what you mean
> >
> 
> I am saying decouple the notion of comparable entities and killable entities.

There is no strong (bijection) relation there. Right now killable
entities are comparable (which I hope we agree is the right thing to do)
but nothing really prevents even non-killable entities to be compared in
the future.

-- 
Michal Hocko
SUSE Labs