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SubjectRe: [PATCH 04/12] Export fragmentation index via /proc/pagetypeinfo
On 02/12/2010 07:00 AM, 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.
> 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<>

Acked-by: Rik van Riel <>

All rights reversed.

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