mm/compaction.c: __compact_pgdat() code cleanuup

This patch uses is_via_compact_memory() to distinguish compaction from
sysfs or sysctl.  And, this patch also reduces indentation on
compaction_defer_reset() by filtering these cases first before checking
watermark.

There is no functional change.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/compaction.c b/mm/compaction.c
index ac6c694..585de54 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1658,14 +1658,15 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
                                !compaction_deferred(zone, cc->order))
                        compact_zone(zone, cc);
 
-               if (cc->order > 0) {
-                       if (zone_watermark_ok(zone, cc->order,
-                                               low_wmark_pages(zone), 0, 0))
-                               compaction_defer_reset(zone, cc->order, false);
-               }
-
                VM_BUG_ON(!list_empty(&cc->freepages));
                VM_BUG_ON(!list_empty(&cc->migratepages));
+
+               if (is_via_compact_memory(cc->order))
+                       continue;
+
+               if (zone_watermark_ok(zone, cc->order,
+                               low_wmark_pages(zone), 0, 0))
+                       compaction_defer_reset(zone, cc->order, false);
        }
 }