linux-kernel - Re: Improving OOM killer

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Message-ID: <20100210221847.5d7bb3cb@lxorguk.ukuu.org.uk>
Date:	Wed, 10 Feb 2010 22:18:47 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rik van Riel <riel@...hat.com>
Cc:	Lubos Lunak <l.lunak@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>, Jiri Kosina <jkosina@...e.cz>
Subject: Re: Improving OOM killer

> Killing the system daemon *is* a DoS.
> 
> It would stop eg. the database or the web server, which is
> generally the main task of systems that run a database or
> a web server.

One of the problems with picking on tasks that fork a lot is that
describes apache perfectly. So a high loaded apache will get shot over a
rapid memory eating cgi script.

Any heuristic is going to be iffy - but that isn't IMHO a good one to
work from. If anything "who allocated lots of RAM recently" may be a
better guide but we don't keep stats for that.

Alan
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