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

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Message-ID: <20090126195431.GC504@balbir.in.ibm.com>
Date:	Tue, 27 Jan 2009 01:24:31 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
Cc:	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>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC] [PATCH] Cgroup based OOM killer controller

* 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.

-- 
	Balbir
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