Messages in this thread | | | Date | Wed, 17 Feb 2010 23:09:21 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH 09/12] Do not compact within a preferred zone after a compaction failure |
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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@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
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