On 09/20/2012 10:04 AM, Mel Gorman wrote:
From: Shaohua Li <s...@fusionio.com>
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.
[minc...@kernel.org: Putback pages isolated for migration if aborting]
[a...@linux-foundation.org: compact_zone_order requires non-NULL arg contended]
Signed-off-by: Andrea Arcangeli <aarca...@redhat.com>
Signed-off-by: Shaohua Li <s...@fusionio.com>
Signed-off-by: Mel Gorman <mgor...@suse.de>
Acked-by: Rik van Riel <r...@redhat.com>
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