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| author | Shaohua Li <shli@kernel.org> | 2012-10-08 16:32:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:48 +0900 |
| commit | e64c5237cf6ff474cb2f3f832f48f2b441dd9979 (patch) | |
| tree | 88fb8ec8e9e2d32051aaacf90a306f7b124e4135 /mm/filemap.c | |
| parent | f2d52fe51c8c0a18cf5fbe583bad51090d12c146 (diff) | |
| download | linux-e64c5237cf6ff474cb2f3f832f48f2b441dd9979.tar.gz linux-e64c5237cf6ff474cb2f3f832f48f2b441dd9979.tar.bz2 linux-e64c5237cf6ff474cb2f3f832f48f2b441dd9979.zip | |
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/filemap.c')
0 files changed, 0 insertions, 0 deletions