linux-kernel - Re: [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible

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Message-ID: <505B6669.2040104@redhat.com>
Date:	Thu, 20 Sep 2012 14:54:33 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Richard Davies <richard@...chsys.com>,
	Shaohua Li <shli@...nel.org>, Avi Kivity <avi@...hat.com>,
	QEMU-devel <qemu-devel@...gnu.org>, KVM <kvm@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as
 possible

On 09/20/2012 10:04 AM, Mel Gorman wrote:
> Compactions free scanner acquires the zone->lock when checking for PageBuddy
> pages and isolating them. It does this even if there are no PageBuddy pages
> in the range.
>
> This patch defers acquiring the zone lock for as long as possible. In the
> event there are no free pages in the pageblock then the lock will not be
> acquired at all which reduces contention on zone->lock.
>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: Rik van Riel <riel@...hat.com>

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