Message-ID: <4B41F572.3080406@redhat.com>
Date: Mon, 04 Jan 2010 09:04:34 -0500
From: Rik van Riel <riel@redhat.com>
Organization: Red Hat, Inc
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To: Mel Gorman <mel@csn.ul.ie>
CC: Andrew Morton <akpm@linux-foundation.org>,
       Corrado Zoccolo <czoccolo@gmail.com>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] page allocator: Reduce fragmentation in buddy allocator
 by	adding buddies that are merging to the tail of the free lists
References: <20100104135545.GC6373@csn.ul.ie>
In-Reply-To: <20100104135545.GC6373@csn.ul.ie>
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On 01/04/2010 08:55 AM, Mel Gorman wrote:
> From: Corrado Zoccolo<czoccolo@gmail.com>
>
> In order to reduce fragmentation, this patch classifies freed pages in
> two groups according to their probability of being part of a high order
> merge. Pages belonging to a compound whose next-highest buddy is free are
> more likely to be part of a high order merge in the near future, so they
> will be added at the tail of the freelist. The remaining pages are put at
> the front of the freelist.

> [mel@csn.ul.ie: Tested, reworked for less branches]
> Signed-off-by: Mel Gorman<mel@csn.ul.ie>

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

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