linux-kernel - Re: [PATCH] oom: consider multi-threaded tasks in task_will_free

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Message-Id: <20160517152139.fbda59b7c66e8470575050e8@linux-foundation.org>
Date:	Tue, 17 May 2016 15:21:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH] oom: consider multi-threaded tasks in
 task_will_free_mem

On Tue, 17 May 2016 22:28:56 +0200 Michal Hocko <mhocko@...nel.org> wrote:

> Andrew, this is not in the mmotm tree now because I didn't feel really
> confortable with the patch without Oleg seeing it. But it seems Oleg is
> ok [1] with it so could you push it to Linus along with the rest of oom
> pile please?

Reluctant.  The CONFIG_COMPACTION=n regression which Joonsoo identified
is quite severe.  Before patch: 10000 forks succeed.  After patch: 500
forks fail.  Ouch.

How can we merge such a thing?