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mm/compaction: reset compaction scanner positions

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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 <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Gioh Kim 2015-04-15 16:13:33 -07:00 • committed by Linus Torvalds
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);