linux-kernel - Re: [patch 4/7 -mm] oom: badness heuristic rewrite

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Date:	Wed, 10 Feb 2010 23:10:37 -0500
From:	Rik van Riel <riel@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Lubos Lunak <l.lunak@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 4/7 -mm] oom: badness heuristic rewrite

On 02/10/2010 11:32 AM, David Rientjes wrote:

> OOM_ADJUST_MIN and OOM_ADJUST_MAX have been exported to userspace since
> 2006 via include/linux/oom.h.  This alters their values from -16 to -1000
> and from +15 to +1000, respectively.

That seems like a bad idea.  Google may have the luxury of
being able to recompile all its in-house applications, but
this will not be true for many other users of /proc/<pid>/oom_adj

> +/*
> + * Tasks that fork a very large number of children with seperate address spaces
> + * may be the result of a bug, user error, or a malicious application.  The oom
> + * killer assesses a penalty equaling

It could also be the result of the system getting many client
connections - think of overloaded mail, web or database servers.

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