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

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Message-ID: <20100223063129.GI3063@balbir.in.ibm.com>
Date:	Tue, 23 Feb 2010 12:01:29 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.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

* David Rientjes <rientjes@...gle.com> [2010-02-15 14:20:06]:

> 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.
-- 
	Three Cheers,
	Balbir
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