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>
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