linux-kernel - [RFC PATCH 0/2] oom, memcg: do not report racy no-eligible OOM

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Message-Id: <20181022071323.9550-1-mhocko@kernel.org>
Date:   Mon, 22 Oct 2018 09:13:21 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     <linux-mm@...ck.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 0/2] oom, memcg: do not report racy no-eligible OOM

Hi,
this is a follow up for [1] which has been nacked mostly because Tetsuo
was able to find a simple workload which can trigger a race where
no-eligible task is reported without a good reason. I believe the patch2
addresses that issue and we do not have to play dirty games with
throttling just because of the race. I still believe that patch proposed
in [1] is a useful one but this can be addressed later.

This series comprises 2 patch. The first one is something I meant to do
loooong time ago, I just never have time to do that. We need it here to
handle CLONE_VM without CLONE_SIGHAND cases. The second patch closes the
race.

I didn't get to test this throughly so it is posted as an RFC.

Feedback is appreciated of course.

[1] http://lkml.kernel.org/r/20181010151135.25766-1-mhocko@kernel.org