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Subject: Re: [PATCH 2/2] mm: page allocator: Do not drain per-cpu lists via
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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Thu, 12 Jan 2012 16:18:12 +0100
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To: Mel Gorman <mgorman@suse.de>
Cc: Linux-MM <linux-mm@kvack.org>, Linux-FSDevel <linux-fsdevel@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>, Russell King - ARM Linux <linux@arm.linux.org.uk>, Gilad Ben-Yossef <gilad@benyossef.com>, "Paul E.
 McKenney" <paulmck@linux.vnet.ibm.com>, Miklos Szeredi <mszeredi@novell.com>, "Eric W. Biederman" <ebiederm@xmission.com>, Greg KH <gregkh@suse.de>, Gong Chen <gong.chen@intel.com>

On Wed, 2012-01-11 at 10:11 +0000, Mel Gorman wrote:
> At least one bug report has
> been seen on ppc64 against a 3.0 era kernel that looked like a bug
> receiving interrupts on a CPU being offlined.=20

Got details on that Mel? The preempt_disable() in on_each_cpu() should
serialize against the stop_machine() crap in unplug.

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