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authorShaohua Li <shli@kernel.org>2012-10-08 16:32:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:48 +0900
commite64c5237cf6ff474cb2f3f832f48f2b441dd9979 (patch)
tree88fb8ec8e9e2d32051aaacf90a306f7b124e4135 /mm/internal.h
parentf2d52fe51c8c0a18cf5fbe583bad51090d12c146 (diff)
mm: compaction: abort compaction loop if lock is contended or run too long
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. An additional check is added to ensure that cc.migratepages and cc.freepages get properly drained whan compaction is aborted. [minchan@kernel.org: Putback pages isolated for migration if aborting] [akpm@linux-foundation.org: compact_zone_order requires non-NULL arg contended] [akpm@linux-foundation.org: make compact_zone_order() require non-NULL arg `contended'] [minchan@kernel.org: Putback pages isolated for migration if aborting] Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 96cda4c6ac56..97664be2ca37 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -130,7 +130,7 @@ struct compact_control {
int order; /* order a direct compactor needs */
int migratetype; /* MOVABLE, RECLAIMABLE etc */
struct zone *zone;
- bool *contended; /* True if a lock was contended */
+ bool contended; /* True if a lock was contended */
struct page **page; /* Page captured of requested size */
};