linux-kernel - Re: [take3] OOM documentation update [was: Linux killed Kenny, bastard!]

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Message-ID: <20090115085144.GC29586@ioremap.net>
Date:	Thu, 15 Jan 2009 11:51:44 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-kernel@...r.kernel.org, Bryan Donlan <bdonlan@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Matthias Andree <matthias.andree@....de>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: Re: [take3] OOM documentation update [was: Linux killed Kenny, bastard!]

On Wed, Jan 14, 2009 at 04:58:41PM -0800, David Rientjes (rientjes@...gle.com) wrote:
> > +
> > +The task with the highest badness score is then killed.
> > +
> 
> Not quite, even after a task is selected for oom kill, the oom killer 
> still prefers to kill one of its children first if any have a different 
> mm.  See oom_kill_process().

Ok, if it was not clear from the description.

> You also don't mention the exception of OOM_DISABLE (oom_adj score of -17) 
> in your formula for how oom_adj impacts the points value.  Although its 
> already explained earlier, it should be mentioned here since a oom_adj is 
> an int and a right shift of 17 does not guarantee `points' will be 0.

It is written several lines above.

-- 
	Evgeniy Polyakov
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