linux-kernel - Re: [RFC] [PATCH] Cgroup based OOM killer controller

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Message-ID: <20090127215539.GC12431@ioremap.net>
Date:	Wed, 28 Jan 2009 00:55:39 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	David Rientjes <rientjes@...gle.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, balbir@...ux.vnet.ibm.com,
	Nikanth Karthikesan <knikanth@...e.de>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Torvalds <torvalds@...ux-foundation.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>,
	Paul Menage <menage@...gle.com>
Subject: Re: [RFC] [PATCH] Cgroup based OOM killer controller

On Tue, Jan 27, 2009 at 12:41:03PM -0800, David Rientjes (rientjes@...gle.com) wrote:
> > Having some special application which will monitor /dev/mem_notify and
> > kill processes based on its own hueristics is a good idea, but when it
> > fails to do its work (or does not exist) system has to have ability to
> > make a progress and invoke a main oom-killer.
> 
> Agreed, very similiar to the cgroup oom notifier patch that invokes the 
> oom killer if there are no attached tasks waiting to handle the situation. 
> 
> In this case, it would be a configurable delay to allow userspace to act 
> in response to oom conditions before invoking the kernel oom killer.  So 
> instead of thinking of this as a userspace replacement for the oom killer, 
> it simply preempts it if userspace can provide more memory, including the 
> possibility of killing tasks itself.

How different may look idea expressed by the different phrases and cold
heads :)

-- 
	Evgeniy Polyakov
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