linux-kernel - Re: [PATCH] mm/oom_kill.c: don't kill TASK

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Message-ID: <CAEPKNTK3DOBApeVDpwJ_B7jkLVp4GQ0ihM1PwAusyc8TWQyB_A@mail.gmail.com>
Date:	Wed, 23 Sep 2015 08:03:16 -0400
From:	Kyle Walker <kwalker@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	mhocko@...nel.org, Christoph Lameter <cl@...ux.com>,
	Oleg Nesterov <oleg@...hat.com>, akpm@...ux-foundation.org,
	Johannes Weiner <hannes@...xchg.org>, vdavydov@...allels.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Stanislav Kozina <skozina@...hat.com>
Subject: Re: [PATCH] mm/oom_kill.c: don't kill TASK_UNINTERRUPTIBLE tasks

On Tue, Sep 22, 2015 at 7:32 PM, David Rientjes <rientjes@...gle.com> wrote:
>
> I struggle to understand how the approach of randomly continuing to kill
> more and more processes in the hope that it slows down usage of memory
> reserves or that we get lucky is better.

Thank you to one and all for the feedback.

I agree, in lieu of treating TASK_UNINTERRUPTIBLE tasks as unkillable,
and omitting them from the oom selection process, continuing the
carnage is likely to result in more unpredictable results. At this
time, I believe Oleg's solution of zapping the process memory use
while it sleeps with the fatal signal enroute is ideal.

Kyle Walker
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