The patch titled
Subject: mm/compaction: reset compaction scanner positions
has been added to the -mm tree. Its filename is
mm-compaction-reset-compaction-scanner-positions.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-reset-compaction-scanner-positions.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-reset-compaction-scanner-positions.patch
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------------------------------------------------------
From: Gioh Kim <gioh.kim@xxxxxxx>
Subject: 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@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff -puN mm/compaction.c~mm-compaction-reset-compaction-scanner-positions mm/compaction.c
--- a/mm/compaction.c~mm-compaction-reset-compaction-scanner-positions
+++ a/mm/compaction.c
@@ -1605,6 +1605,14 @@ static void __compact_pgdat(pg_data_t *p
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);
_
Patches currently in -mm which might be from gioh.kim@xxxxxxx are
mm-page_alloc-call-kernel_map_pages-in-unset_migrateype_isolate.patch
mm-compaction-reset-compaction-scanner-positions.patch
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