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

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Date:	Mon, 26 Jan 2009 19:56:22 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	balbir@...ux.vnet.ibm.com
Cc:	Nikanth Karthikesan <knikanth@...e.de>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Arve Hj?nnev?g <arve@...roid.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>
Subject: Re: [RFC] [PATCH] Cgroup based OOM killer controller

On Tue, 27 Jan 2009 01:24:31 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * Nikanth Karthikesan <knikanth@...e.de> [2009-01-21 16:38:21]:
> 
> > As Alan Cox suggested/wondered in this thread, 
> > http://lkml.org/lkml/2009/1/12/235 , this is a container group based approach 
> > to override the oom killer selection without losing all the benefits of the 
> > current oom killer heuristics and oom_adj interface.
> > 
> > It adds a tunable oom.victim to the oom cgroup. The oom killer will kill the 
> > process using the usual badness value but only within the cgroup with the 
> > maximum value for oom.victim before killing any process from a cgroup with a 
> > lesser oom.victim number. Oom killing could be disabled by setting 
> > oom.victim=0.
> 
> Looking at the patch, I wonder if it is time for user space OOM
> notifications that were discussed during the containers mini-summit.
> The idea is to inform user space about OOM's and let user space take
> action, if no action is taken, the default handler kicks in.

The OLPC folks (Marcelo I believe) posted code for this and I believe
OLPC is using this functionality internally so that under memory pressure
(before we actually hit OOM) programs can respond by doing stuff like
evicting caches.
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