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| author | Gioh Kim <gioh.kim@lge.com> | 2015-04-16 01:13:33 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-16 01:35:17 +0200 |
| commit | 195b0c60809ce841e5818b365808e7da3286fd3c (patch) | |
| tree | 9bc2493c7ea9a21f10f0d4ba8cda050bd6eb4b33 /mm/compaction.c | |
| parent | mm, memcg: sync allocation and memcg charge gfp flags for THP (diff) | |
| download | linux-195b0c60809ce841e5818b365808e7da3286fd3c.tar.xz linux-195b0c60809ce841e5818b365808e7da3286fd3c.zip | |
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>
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 570426edcadf..e6c4f9475d43 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -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); |