linux-kernel - Re: [PATCH 3/5] mm: compaction: Capture a suitable high-order page immediately when it is made available

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Message-ID: <20120809233503.GE21033@bbox>
Date:	Fri, 10 Aug 2012 08:35:03 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>,
	Jim Schutt <jaschut@...dia.gov>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] mm: compaction: Capture a suitable high-order page
 immediately when it is made available

On Thu, Aug 09, 2012 at 02:49:23PM +0100, Mel Gorman wrote:
> While compaction is migrating pages to free up large contiguous blocks for
> allocation it races with other allocation requests that may steal these
> blocks or break them up. This patch alters direct compaction to capture a
> suitable free page as soon as it becomes available to reduce this race. It
> uses similar logic to split_free_page() to ensure that watermarks are
> still obeyed.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Reviewed-by: Rik van Riel <riel@...hat.com>
Reviewed-by: Minchan Kim <minchan@...nel.org>

-- 
Kind regards,
Minchan Kim
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