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

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Date:	Thu, 22 Jan 2009 02:18:04 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
cc:	Evgeniy Polyakov <zbr@...emap.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Paul Menage <menage@...gle.com>,
	containers@...ts.linux-foundation.org
Subject: Re: [RFC] [PATCH] Cgroup based OOM killer controller

On Thu, 22 Jan 2009, Nikanth Karthikesan wrote:

> I think cpusets preference could be improved, not to depend on badness, with 
> something similar to what memcg does. With or without adding overhead of 
> tracking processes that has memory from a node.
> 

We actually used to do that: we excluded all tasks that did not share the 
same cpuset in select_bad_process().  That exclusion was reimplemented as 
a preference in badness() since, again, it is quite possible that a large 
memory-hogging task without a sufficient oom_adj score, as you mentioned, 
has allocated memory on the cpuset's nodes before being moved to a 
different cpuset or changing its set of allowable nodes.

I think you would find the per-cgroup oom notifier patch[*] of interest.  
It seems to have been dropped after some discussion on improvements, but 
allows you to defer all of these decisions to userspace.  Would something 
like that fix your problem?

 [*] http://marc.info/?l=linux-mm&m=122575082227252
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