Commit 195b0c60 authored by Gioh Kim's avatar Gioh Kim Committed by Linus Torvalds

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: default avatarGioh Kim <gioh.kim@lge.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3b363692
......@@ -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);
......
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