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

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Message-Id: <20090430154920.64c9c866.akpm@linux-foundation.org>
Date:	Thu, 30 Apr 2009 15:49:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
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 15:38:53 -0700 (PDT)
David Rientjes <rientjes@...gle.com> 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?

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