Message-ID: <4B7AE3D9.9040504@redhat.com>
Date: Tue, 16 Feb 2010 13:28:41 -0500
From: Rik van Riel <riel@redhat.com>
Organization: Red Hat, Inc
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To: Mel Gorman <mel@csn.ul.ie>
CC: Andrea Arcangeli <aarcange@redhat.com>,
       Christoph Lameter <cl@linux-foundation.org>,
       Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
       David Rientjes <rientjes@google.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 03/12] Export unusable free space index via /proc/pagetypeinfo
References: <1265976059-7459-1-git-send-email-mel@csn.ul.ie> <1265976059-7459-4-git-send-email-mel@csn.ul.ie>
In-Reply-To: <1265976059-7459-4-git-send-email-mel@csn.ul.ie>
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On 02/12/2010 07:00 AM, Mel Gorman wrote:
> Unusuable free space index is a measure of external fragmentation that
> takes the allocation size into account. 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.
>
> The index is normally calculated as a value between 0 and 1 which is
> obviously unsuitable within the kernel. Instead, the first three decimal
> places are used as a value between 0 and 1000 for an integer approximation.
>
> Signed-off-by: Mel Gorman<mel@csn.ul.ie>

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

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