linux-kernel - [PATCH] mm: Move check for SHRINKER_NUMA_AWARE to do_shrink

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Message-ID: <153320759911.18959.8842396230157677671.stgit@localhost.localdomain>
Date:   Thu, 02 Aug 2018 14:00:52 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     akpm@...ux-foundation.org, ktkhai@...tuozzo.com,
        vdavydov.dev@...il.com, mhocko@...e.com, aryabinin@...tuozzo.com,
        ying.huang@...el.com, penguin-kernel@...ove.SAKURA.ne.jp,
        willy@...radead.org, shakeelb@...gle.com, jbacik@...com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: 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.

(Andrew, this may be merged to mm-iterate-only-over-charged-shrinkers-during-memcg-shrink_slab)

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 mm/vmscan.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index ea0a46166e8e..0d980e801b8a 100644
--- 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;