On 09/20/2012 10:04 AM, Mel Gorman wrote:
From: Shaohua Li <shli@xxxxxxxxxxxx> Changelog since V2 o Fix BUG_ON triggered due to pages left on cc.migratepages o Make compact_zone_order() require non-NULL arg `contended' Changelog since V1 o only abort the compaction if lock is contended or run too long o Rearranged the code by Andrea Arcangeli. isolate_migratepages_range() might isolate no pages if for example when zone->lru_lock is contended and running asynchronous compaction. In this case, we should abort compaction, otherwise, compact_zone will run a useless loop and make zone->lru_lock is even contended. [minchan@xxxxxxxxxx: Putback pages isolated for migration if aborting] [akpm@xxxxxxxxxxxxxxxxxxxx: compact_zone_order requires non-NULL arg contended] Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> Signed-off-by: Shaohua Li <shli@xxxxxxxxxxxx> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
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