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Date: Fri, 21 Sep 2012 14:31:22 -0700
From: Andrew Morton <akpm@linux-foundation.org>
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Subject: Re: [Qemu-devel] [PATCH 4/9] mm: compaction: Abort compaction loop
 if lock is contended or run too long
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To: Mel Gorman <mgorman@suse.de>
Cc: Richard Davies <richard@arachsys.com>, KVM <kvm@vger.kernel.org>, QEMU-devel <qemu-devel@nongnu.org>, LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, Avi Kivity <avi@redhat.com>, Shaohua Li <shli@kernel.org>

On Fri, 21 Sep 2012 11:46:18 +0100
Mel Gorman <mgorman@suse.de> wrote:

> Changelog since V2
> o Fix BUG_ON triggered due to pages left on cc.migratepages
> o Make compact_zone_order() require non-NULL arg `contended'
> 
> Changelog since V1
> o only abort the compaction if lock is contended or run too long
> o Rearranged the code by Andrea Arcangeli.
> 
> isolate_migratepages_range() might isolate no pages if for example when
> zone->lru_lock is contended and running asynchronous compaction. In this
> case, we should abort compaction, otherwise, compact_zone will run a
> useless loop and make zone->lru_lock is even contended.

hm, this appears to be identical to

mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long.patch
mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix.patch
mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix-2.patch

so I simply omitted patches 2, 3 and 4.