[PATCH 2/2] mm: compaction: allow isolation of lower order buddy pages

[Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>]

Allow lower order buddy pages in suitable_migration_target()
so isolate_freepages() can isolate them as free pages during
compaction_alloc() phase.

Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 mm/compaction.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index bc77135..642c17a 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -115,8 +115,8 @@ static bool suitable_migration_target(struct page *page)
 	if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
 		return false;
 
-	/* If the page is a large free page, then allow migration */
-	if (PageBuddy(page) && page_order(page) >= pageblock_order)
+	/* If the page is a free page, then allow migration */
+	if (PageBuddy(page))
 		return true;
 
 	/* If the block is MIGRATE_MOVABLE, allow migration */
-- 
1.7.9.4

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