Date: Tue, 3 Jan 2006 13:34:48 -0800
From: Paul Jackson <pj@sgi.com>
To: KUROSAWA Takahiro <kurosawa@valinux.co.jp>
Cc: linux-kernel@vger.kernel.org
Subject: Re: oom-killer causes lockups in cpuset_excl_nodes_overlap()
Message-Id: <20060103133448.7530f879.pj@sgi.com>
In-Reply-To: <20051228004026.72F3474005@sv1.valinux.co.jp>
References: <20051228004026.72F3474005@sv1.valinux.co.jp>
Organization: SGI
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KUROSAWA Takahiro wrote:
>
> The oom-killer causes lockups because it calls
> cpuset_excl_nodes_overlap() with tasklist_lock read-locked.
> cpuset_excl_nodes_overlap() gets cpuset_sem (or callback_sem in
> later linux versions) semaphore, which might_sleep even if the
> semaphore could be down without sleeping.

Thank-you for catching this.  My apologies for not responding sooner.
I was off the air for a week.  I will look at this now.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401
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