linux-kernel - Re: [PATCH 07/12] Export fragmentation index via /proc/pagetypeinfo

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Message-ID: <4B7F29F3.2010209@redhat.com>
Date:	Fri, 19 Feb 2010 19:16:51 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 07/12] Export fragmentation index via /proc/pagetypeinfo

On 02/18/2010 01:02 PM, Mel Gorman wrote:
> Fragmentation index is a value that makes sense when an allocation of a
> given size would fail. The index indicates whether an allocation failure is
> due to a lack of memory (values towards 0) or due to external fragmentation
> (value towards 1).  For the most part, the huge page size will be the size
> of interest but not necessarily so it is exported on a per-order and per-zone
> basis via /proc/pagetypeinfo.
>
> Signed-off-by: Mel Gorman<mel@....ul.ie>

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

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