linux-kernel - Re: [patch -mm 3/9 v2] oom: select task from tasklist for mempolicy ooms

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Message-ID: <alpine.DEB.2.00.1002230014570.5842@chino.kir.corp.google.com>
Date:	Tue, 23 Feb 2010 00:17:26 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Lubos Lunak <l.lunak@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch -mm 3/9 v2] oom: select task from tasklist for mempolicy
 ooms

On Tue, 23 Feb 2010, Balbir Singh wrote:

> > The oom killer presently kills current whenever there is no more memory
> > free or reclaimable on its mempolicy's nodes.  There is no guarantee that
> > current is a memory-hogging task or that killing it will free any
> > substantial amount of memory, however.
> > 
> > In such situations, it is better to scan the tasklist for nodes that are
> > allowed to allocate on current's set of nodes and kill the task with the
> > highest badness() score.  This ensures that the most memory-hogging task,
> > or the one configured by the user with /proc/pid/oom_adj, is always
> > selected in such scenarios.
> > 
> > Signed-off-by: David Rientjes <rientjes@...gle.com>
> 
> Seems reasonable, but I think it will require lots of testing.

I already tested it by checking that tasks with very elevated oom_adj 
values don't get killed when they do not share the same MPOL_BIND nodes as 
a memory-hogging task.

What additional testing did you have in mind?
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