linux-kernel - Re: [v7 2/5] mm, oom: cgroup-aware OOM killer

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Message-ID: <20170911084931.zezai6aufcfi2ddt@dhcp22.suse.cz>
Date:   Mon, 11 Sep 2017 10:49:31 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Christopher Lameter <cl@...ux.com>
Cc:     Roman Gushchin <guro@...com>, linux-mm@...ck.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,
        linux-kernel@...r.kernel.org
Subject: Re: [v7 2/5] mm, oom: cgroup-aware OOM killer

On Thu 07-09-17 11:18:18, Cristopher Lameter wrote:
> On Mon, 4 Sep 2017, Roman Gushchin wrote
> 
> > To address these issues, cgroup-aware OOM killer is introduced.
> 
> You are missing a major issue here. Processes may have allocation
> constraints to memory nodes, special DMA zones etc etc. OOM conditions on
> such resource constricted allocations need to be dealt with. Killing
> processes that do not allocate with the same restrictions may not do
> anything to improve conditions.

memcg_oom_badness tries to be node aware - very similar to what the
oom_badness does for the regular oom killer. Or do you have anything
else in mind?
-- 
Michal Hocko
SUSE Labs