Re: [PATCH 09/12] Do not compact within a preferred zone after acompaction failure

[Rik van Riel]

On 02/12/2010 07:00 AM, Mel Gorman wrote:
> The fragmentation index may indicate that a failure it due to external
> fragmentation, a compaction run complete and an allocation failure still
> fail. There are two obvious reasons as to why
>
>    o Page migration cannot move all pages so fragmentation remains
>    o A suitable page may exist but watermarks are not met
>
> In the event of compaction and allocation failure, this patch prevents
> compaction happening for a short interval. It's only recorded on the
> preferred zone but that should be enough coverage. This could have been
> implemented similar to the zonelist_cache but the increased size of the
> zonelist did not appear to be justified.
>
> Signed-off-by: Mel Gorman<mel@xxxxxxxxx>

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

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