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authorMel Gorman <mgorman@suse.de>2013-07-08 16:00:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-09 10:33:23 -0700
commit5a1c9cbc1550f93335d7c03eb6c271e642deff04 (patch)
treefcb1a125a410a68807aa02e317d0717e65d7abd4 /mm
parent7e9f5eb03d3762ec89dda1888c774ae7b4040af7 (diff)
mm: vmscan: do not continue scanning if reclaim was aborted for compaction
Direct reclaim is not aborting to allow compaction to go ahead properly. do_try_to_free_pages is told to abort reclaim which is happily ignores and instead increases priority instead until it reaches 0 and starts shrinking file/anon equally. This patch corrects the situation by aborting reclaim when requested instead of raising priority. Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Dave Chinner <david@fromorbit.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmscan.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 99b3ac7771ad..2385663ae5e5 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2361,8 +2361,10 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
aborted_reclaim = shrink_zones(zonelist, sc);
/*
- * Don't shrink slabs when reclaiming memory from
- * over limit cgroups
+ * Don't shrink slabs when reclaiming memory from over limit
+ * cgroups but do shrink slab at least once when aborting
+ * reclaim for compaction to avoid unevenly scanning file/anon
+ * LRU pages over slab pages.
*/
if (global_reclaim(sc)) {
unsigned long lru_pages = 0;
@@ -2404,7 +2406,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
WB_REASON_TRY_TO_FREE_PAGES);
sc->may_writepage = 1;
}
- } while (--sc->priority >= 0);
+ } while (--sc->priority >= 0 && !aborted_reclaim);
out:
delayacct_freepages_end();