diff --git a/mm/shrinker.c b/mm/shrinker.c
index d318f5621862..fee6f62904fb 100644
--- a/mm/shrinker.c
+++ b/mm/shrinker.c

@@ -107,6 +107,12 @@ static struct shrinker_info *shrinker_info_protected(struct mem_cgroup *memcg,
 					 lockdep_is_held(&shrinker_rwsem));
 }
 
+static struct shrinker_info *shrinker_info_rcu(struct mem_cgroup *memcg,
+					       int nid)
+{
+	return rcu_dereference(memcg->nodeinfo[nid]->shrinker_info);
+}

 static int expand_one_shrinker_info(struct mem_cgroup *memcg, int new_size,
 				    int old_size, int new_nr_max)
 {

@@ -198,7 +204,7 @@ void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
 		struct shrinker_info_unit *unit;
 
 		rcu_read_lock();
-		info = rcu_dereference(memcg->nodeinfo[nid]->shrinker_info);
+		info = shrinker_info_rcu(memcg, nid);

 		unit = info->unit[shriner_id_to_index(shrinker_id)];
 		if (!WARN_ON_ONCE(shrinker_id >= info->map_nr_max)) {
 			/* Pairs with smp mb in shrink_slab() */

@@ -211,7 +217,7 @@ void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
 
 static DEFINE_IDR(shrinker_idr);
 
-static int prealloc_memcg_shrinker(struct shrinker *shrinker)
+static int shrinker_memcg_alloc(struct shrinker *shrinker)

@@ -253,10 +258,15 @@ static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
 {
 	struct shrinker_info *info;
 	struct shrinker_info_unit *unit;
+	long nr_deferred;
 
-	info = shrinker_info_protected(memcg, nid);
+	rcu_read_lock();
+	info = shrinker_info_rcu(memcg, nid);
 	unit = info->unit[shriner_id_to_index(shrinker->id)];
-	return atomic_long_xchg(&unit->nr_deferred[shriner_id_to_offset(shrinker->id)], 0);
+	nr_deferred = atomic_long_xchg(&unit->nr_deferred[shriner_id_to_offset(shrinker->id)], 0);
+	rcu_read_unlock();
+
+	return nr_deferred;
 }

@@ -464,18 +480,23 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 	if (!mem_cgroup_online(memcg))
 		return 0;
 
-	if (!down_read_trylock(&shrinker_rwsem))
-		return 0;
-
-	info = shrinker_info_protected(memcg, nid);
+again:
+	rcu_read_lock();
+	info = shrinker_info_rcu(memcg, nid);
 	if (unlikely(!info))
 		goto unlock;
 
-	for (; index < shriner_id_to_index(info->map_nr_max); index++) {
+	if (index < shriner_id_to_index(info->map_nr_max)) {
 		struct shrinker_info_unit *unit;
 
 		unit = info->unit[index];
 
+		/*
+		 * The shrinker_info_unit will not be freed, so we can
+		 * safely release the RCU lock here.
+		 */
+		rcu_read_unlock();

+
 		for_each_set_bit(offset, unit->map, SHRINKER_UNIT_BITS) {
 			struct shrink_control sc = {
 				.gfp_mask = gfp_mask,

@@ -485,12 +506,14 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 			struct shrinker *shrinker;
 			int shrinker_id = calc_shrinker_id(index, offset);
 
+			rcu_read_lock();
 			shrinker = idr_find(&shrinker_idr, shrinker_id);
-			if (unlikely(!shrinker || !(shrinker->flags & SHRINKER_REGISTERED))) {
-				if (!shrinker)
-					clear_bit(offset, unit->map);
+			if (unlikely(!shrinker || !shrinker_try_get(shrinker))) {
+				clear_bit(offset, unit->map);
+				rcu_read_unlock();
 				continue;
 			}
+			rcu_read_unlock();
 
 			/* Call non-slab shrinkers even though kmem is disabled */
 			if (!memcg_kmem_online() &&

@@ -523,15 +546,20 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 					set_shrinker_bit(memcg, nid, shrinker_id);
 			}
 			freed += ret;
-
-			if (rwsem_is_contended(&shrinker_rwsem)) {
-				freed = freed ? : 1;
-				goto unlock;
-			}
+			shrinker_put(shrinker);