linux-kernel - Re: [PATCH] oom killer: break from infinite loop

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Message-ID: <alpine.DEB.2.00.1003302331001.839@chino.kir.corp.google.com>
Date:	Tue, 30 Mar 2010 23:32:35 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	anfei <anfei.zhou@...il.com>, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	nishimura@....nes.nec.co.jp, Mel Gorman <mel@....ul.ie>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] oom killer: break from infinite loop

On Wed, 31 Mar 2010, Balbir Singh wrote:

> > To me, this patch is acceptable and seems reasnoable.
> > 
> > But I didn't joined to memcg development when this check was added
> > and don't know why kill current..
> >
> 
> The reason for adding current was that we did not want to loop
> forever, since it stops forward progress - no error/no forward
> progress. It made sense to oom kill the current process, so that the
> cgroup admin could look at what went wrong.
>  

oom_kill_process() will fail on current since it wasn't selected as an 
eligible task to kill in select_bad_process() and we know it to be a 
member of the memcg, so there's no point in trying to kill it.
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