Re: [PATCH 03/12] Export unusable free space index via /proc/pagetypeinfo

From: Rik van Riel
Date: Tue Feb 16 2010 - 13:30:12 EST


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@xxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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