On 09/20/2012 10:04 AM, Mel Gorman wrote:
From: Shaohua Li <[email protected]>
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.
[[email protected]: Putback pages isolated for migration if aborting]
[[email protected]: compact_zone_order requires non-NULL arg contended]
Signed-off-by: Andrea Arcangeli <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Rik van Riel <[email protected]>
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