linux-kernel - Re: [patch] oom: prevent livelock when oom_kill_allocating

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Message-ID: <alpine.DEB.2.00.0904301558020.13061@chino.kir.corp.google.com>
Date:	Thu, 30 Apr 2009 15:58:21 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	npiggin@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [patch] oom: prevent livelock when oom_kill_allocating_task is
 set

On Thu, 30 Apr 2009, Andrew Morton wrote:

> > When /proc/sys/vm/oom_kill_allocating_task is set for large systems that
> > want to avoid the lengthy tasklist scan, it's possible to livelock if
> > current is ineligible for oom kill.  This normally happens when it is set
> > to OOM_DISABLE, but is also possible if any threads are sharing the same
> > ->mm with a different tgid.
> 
> OK...  And how does the patch address this problem?
> 
> <reads the code>
> 
> Seems that if we were unable to kill `current', we'll ignore the
> oom_kill_allocating_task setting and will fall back the slow tasklist
> scan?
> 

Yes, sorry.  The annotated changelog you have added to -mm is correct, 
thanks.
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