mm/vmscan.c: move check for SHRINKER_NUMA_AWARE to do_shrink_slab()

In case of shrink_slab_memcg() we do not zero nid, when shrinker is not
numa-aware.  This is not a real problem, since currently all memcg-aware
shrinkers are numa-aware too (we have two: super_block shrinker and
workingset shrinker), but something may change in the future.

Link: http://lkml.kernel.org/r/153320759911.18959.8842396230157677671.stgit@localhost.localdomain
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Josef Bacik <jbacik@fb.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 93fdd0375b648ac6ecddcb97cbaf9d556cc92198..8fcc86f1d7bc3dd0ec4553bdbcd9f204955a78a1 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -455,6 +455,9 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
                                          : SHRINK_BATCH;
        long scanned = 0, next_deferred;
 
+       if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
+               nid = 0;
+
        freeable = shrinker->count_objects(shrinker, shrinkctl);
        if (freeable == 0 || freeable == SHRINK_EMPTY)
                return freeable;
@@ -680,9 +683,6 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
                        .memcg = memcg,
                };
 
-               if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
-                       sc.nid = 0;
-
                ret = do_shrink_slab(&sc, shrinker, priority);
                if (ret == SHRINK_EMPTY)
                        ret = 0;