linux-kernel - Re: [patch 10/11] mm, memcg: add memory.oom

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Message-ID: <20140306211506.GD17902@htj.dyndns.org>
Date:	Thu, 6 Mar 2014 16:15:06 -0500
From:	Tejun Heo <tj@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Mel Gorman <mgorman@...e.de>, Oleg Nesterov <oleg@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Jianguo Wu <wujianguo@...wei.com>,
	Tim Hockin <thockin@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [patch 10/11] mm, memcg: add memory.oom_control notification for
 system oom

On Tue, Mar 04, 2014 at 07:59:41PM -0800, David Rientjes wrote:
> Now that process handling system oom conditions have access to a small
> amount of memory reserves, we need a way to notify those process on
> system oom conditions.
> 
> When a userspace process waits on the root memcg's memory.oom_control, it
> will wake up anytime there is a system oom condition.
> 
> This is a special case of oom notifiers since it doesn't subsequently
> notify all memcgs under the root memcg (all memcgs on the system).  We
> don't want to trigger those oom handlers which are set aside specifically
> for true memcg oom notifications that disable their own oom killers to
> enforce their own oom policy, for example.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Until consensus on the whole approach can be reached,

 Nacked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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