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mm/compaction: reset compaction scanner positions 

When the compaction is activated via /proc/sys/vm/compact_memory it would
better scan the whole zone.  And some platforms, for instance ARM, have
the start_pfn of a zone at zero.  Therefore the first try to compact via
/proc doesn't work.  It needs to reset the compaction scanner position
first.

Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gioh Kim 2015-04-15 16:13:33 -07:00 committed by Linus Torvalds
parent 3b3636924d
commit 195b0c6080
1 changed files with 8 additions and 0 deletions
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8
mm/compaction.c
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@ -1605,6 +1605,14 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
INIT_LIST_HEAD(&cc->freepages);
INIT_LIST_HEAD(&cc->migratepages);
/*
* When called via /proc/sys/vm/compact_memory
* this makes sure we compact the whole zone regardless of
* cached scanner positions.
*/
if (cc->order == -1)
__reset_isolation_suitable(zone);
if (cc->order == -1 || !compaction_deferred(zone, cc->order))
compact_zone(zone, cc);