mm: vmscan: respect NUMA policy mask when shrinking slab on direct reclaim

When direct reclaim is executed by a process bound to a set of NUMA
nodes, we should scan only those nodes when possible, but currently we
will scan kmem from all online nodes even if the kmem shrinker is NUMA
aware.  That said, binding a process to a particular NUMA node won't
prevent it from shrinking inode/dentry caches from other nodes, which is
not good.  Fix this.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Glauber Costa <glommer@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a9c74b409681a460f2c2ef5f45b3f2283a81a4b8..4acee0fe65e7ce71e58f7149db8e0b969d7597b7 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2425,8 +2425,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                        unsigned long lru_pages = 0;
 
                        nodes_clear(shrink->nodes_to_scan);
-                       for_each_zone_zonelist(zone, z, zonelist,
-                                       gfp_zone(sc->gfp_mask)) {
+                       for_each_zone_zonelist_nodemask(zone, z, zonelist,
+                                       gfp_zone(sc->gfp_mask), sc->nodemask) {
                                if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
                                        continue;