linux-kernel - Re: [PATCH 4/6] mm: compaction: Capture a suitable high-order page immediately when it is made available

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Message-ID: <50211865.90702@redhat.com>
Date:	Tue, 07 Aug 2012 09:30:13 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Linux-MM <linux-mm@...ck.org>, Minchan Kim <minchan@...nel.org>,
	Jim Schutt <jaschut@...dia.gov>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] mm: compaction: Capture a suitable high-order page
 immediately when it is made available

On 08/07/2012 08:31 AM, Mel Gorman wrote:
> While compaction is moving 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>

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