mm: remove unnecessary reclaimability check from NUMA balancing target

NUMA balancing already checks the watermarks of the target node to
decide whether it's a suitable balancing target.  Whether the node is
reclaimable or not is irrelevant when we don't intend to reclaim.

Link: http://lkml.kernel.org/r/20170228214007.5621-5-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Jia He <hejianet@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 3 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 738f1d5f8350..5c5df09ac962 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1722,9 +1722,6 @@ static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
 {
         int z;
 
-        if (!pgdat_reclaimable(pgdat))
-                return false;
-
         for (z = pgdat->nr_zones - 1; z >= 0; z--) {
                 struct zone *zone = pgdat->node_zones + z;