linux-kernel - Re: [PATCH] oom: skip frozen tasks

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Message-ID: <alpine.DEB.2.00.1108260209050.14732@chino.kir.corp.google.com>
Date:	Fri, 26 Aug 2011 02:09:59 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
cc:	Michal Hocko <mhocko@...e.cz>, Oleg Nesterov <oleg@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH] oom: skip frozen tasks

On Fri, 26 Aug 2011, Konstantin Khlebnikov wrote:

> > A much better solution would be to lower the badness score that the oom
> > killer uses for PF_FROZEN threads so that they aren't considered a
> > priority for kill unless there's nothing else left to kill.
> 
> Anyway, oom killer shouldn't loop endlessly if it see TIF_MEMDIE on frozen
> task,
> it must go on and try to kill somebody else. We cannot wait for thawing this
> task.
> 

Did you read my suggestion?  I quoted it above again for you.  The badness 
heuristic would only select those tasks to kill as a last resort in the 
hopes they will eventually be thawed and may exit.  Panicking the entire 
machine for what could be isolated by a cgroup is insanity.
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