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

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Message-ID: <20160518071653.GA21654@dhcp22.suse.cz>
Date:	Wed, 18 May 2016 09:16:53 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.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 17-05-16 15:21:39, Andrew Morton wrote:
> 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?

That regression has been fixed by
http://lkml.kernel.org/r/1463051677-29418-3-git-send-email-mhocko@kernel.org

-- 
Michal Hocko
SUSE Labs