[v3 PATCH 06/11] mm: memcontrol: rename shrinker_map to shrinker_info

[Yang Shi]

The following patch is going to add nr_deferred into shrinker_map, the change will
make shrinker_map not only include map anymore, so rename it to a more general
name.  And this should make the patch adding nr_deferred cleaner and readable and make
review easier.

Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
---
 include/linux/memcontrol.h |  8 ++---
 mm/memcontrol.c            |  6 ++--
 mm/vmscan.c                | 66 +++++++++++++++++++-------------------
 3 files changed, 40 insertions(+), 40 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d128d2842f22..e05bbe8277cc 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -96,7 +96,7 @@ struct lruvec_stat {
  * Bitmap of shrinker::id corresponding to memcg-aware shrinkers,
  * which have elements charged to this memcg.
  */
-struct memcg_shrinker_map {
+struct memcg_shrinker_info {
 	struct rcu_head rcu;
 	unsigned long map[];
 };
@@ -118,7 +118,7 @@ struct mem_cgroup_per_node {
 
 	struct mem_cgroup_reclaim_iter	iter;
 
-	struct memcg_shrinker_map __rcu	*shrinker_map;
+	struct memcg_shrinker_info __rcu	*shrinker_info;
 
 	struct rb_node		tree_node;	/* RB tree node */
 	unsigned long		usage_in_excess;/* Set to the value by which */
@@ -1581,8 +1581,8 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
 	return false;
 }
 
-extern int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg);
-extern void memcg_free_shrinker_maps(struct mem_cgroup *memcg);
+extern int memcg_alloc_shrinker_info(struct mem_cgroup *memcg);
+extern void memcg_free_shrinker_info(struct mem_cgroup *memcg);
 extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
 				   int nid, int shrinker_id);
 #else
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 817dde366258..126f1fd550c8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5248,11 +5248,11 @@ static int mem_cgroup_css_online(struct cgroup_subsys_state *css)
 	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
 
 	/*
-	 * A memcg must be visible for memcg_expand_shrinker_maps()
+	 * A memcg must be visible for memcg_expand_shrinker_info()
 	 * by the time the maps are allocated. So, we allocate maps
 	 * here, when for_each_mem_cgroup() can't skip it.
 	 */
-	if (memcg_alloc_shrinker_maps(memcg)) {
+	if (memcg_alloc_shrinker_info(memcg)) {
 		mem_cgroup_id_remove(memcg);
 		return -ENOMEM;
 	}
@@ -5316,7 +5316,7 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
 	vmpressure_cleanup(&memcg->vmpressure);
 	cancel_work_sync(&memcg->high_work);
 	mem_cgroup_remove_from_trees(memcg);
-	memcg_free_shrinker_maps(memcg);
+	memcg_free_shrinker_info(memcg);
 	memcg_free_kmem(memcg);
 	mem_cgroup_free(memcg);
 }
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9761c7c27412..0033659abf9e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -187,20 +187,20 @@ static DECLARE_RWSEM(shrinker_rwsem);
 #ifdef CONFIG_MEMCG
 static int shrinker_nr_max;
 
-static void memcg_free_shrinker_map_rcu(struct rcu_head *head)
+static void memcg_free_shrinker_info_rcu(struct rcu_head *head)
 {
-	kvfree(container_of(head, struct memcg_shrinker_map, rcu));
+	kvfree(container_of(head, struct memcg_shrinker_info, rcu));
 }
 
-static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
-					 int size, int old_size)
+static int memcg_expand_one_shrinker_info(struct mem_cgroup *memcg,
+					  int size, int old_size)
 {
-	struct memcg_shrinker_map *new, *old;
+	struct memcg_shrinker_info *new, *old;
 	int nid;
 
 	for_each_node(nid) {
 		old = rcu_dereference_protected(
-			mem_cgroup_nodeinfo(memcg, nid)->shrinker_map, true);
+			mem_cgroup_nodeinfo(memcg, nid)->shrinker_info, true);
 		/* Not yet online memcg */
 		if (!old)
 			return 0;
@@ -213,17 +213,17 @@ static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
 		memset(new->map, (int)0xff, old_size);
 		memset((void *)new->map + old_size, 0, size - old_size);
 
-		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, new);
-		call_rcu(&old->rcu, memcg_free_shrinker_map_rcu);
+		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_info, new);
+		call_rcu(&old->rcu, memcg_free_shrinker_info_rcu);
 	}
 
 	return 0;
 }
 
-void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
+void memcg_free_shrinker_info(struct mem_cgroup *memcg)
 {
 	struct mem_cgroup_per_node *pn;
-	struct memcg_shrinker_map *map;
+	struct memcg_shrinker_info *info;
 	int nid;
 
 	if (mem_cgroup_is_root(memcg))
@@ -231,16 +231,16 @@ void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
 
 	for_each_node(nid) {
 		pn = mem_cgroup_nodeinfo(memcg, nid);
-		map = rcu_dereference_protected(pn->shrinker_map, true);
-		if (map)
-			kvfree(map);
-		rcu_assign_pointer(pn->shrinker_map, NULL);
+		info = rcu_dereference_protected(pn->shrinker_info, true);
+		if (info)
+			kvfree(info);
+		rcu_assign_pointer(pn->shrinker_info, NULL);
 	}
 }
 
-int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg)
+int memcg_alloc_shrinker_info(struct mem_cgroup *memcg)
 {
-	struct memcg_shrinker_map *map;
+	struct memcg_shrinker_info *info;
 	int nid, size, ret = 0;
 
 	if (mem_cgroup_is_root(memcg))
@@ -249,20 +249,20 @@ int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg)
 	down_read(&shrinker_rwsem);
 	size = DIV_ROUND_UP(shrinker_nr_max, BITS_PER_LONG) * sizeof(unsigned long);
 	for_each_node(nid) {
-		map = kvzalloc(sizeof(*map) + size, GFP_KERNEL);
-		if (!map) {
-			memcg_free_shrinker_maps(memcg);
+		info = kvzalloc(sizeof(*info) + size, GFP_KERNEL);
+		if (!info) {
+			memcg_free_shrinker_info(memcg);
 			ret = -ENOMEM;
 			break;
 		}
-		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map);
+		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_info, info);
 	}
 	up_read(&shrinker_rwsem);
 
 	return ret;
 }
 
-static int memcg_expand_shrinker_maps(int new_id)
+static int memcg_expand_shrinker_info(int new_id)
 {
 	int size, old_size, ret = 0;
 	struct mem_cgroup *memcg;
@@ -279,7 +279,7 @@ static int memcg_expand_shrinker_maps(int new_id)
 	do {
 		if (mem_cgroup_is_root(memcg))
 			continue;
-		ret = memcg_expand_one_shrinker_map(memcg, size, old_size);
+		ret = memcg_expand_one_shrinker_info(memcg, size, old_size);
 		if (ret) {
 			mem_cgroup_iter_break(NULL, memcg);
 			goto out;
@@ -293,13 +293,13 @@ static int memcg_expand_shrinker_maps(int new_id)
 void memcg_set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
 {
 	if (shrinker_id >= 0 && memcg && !mem_cgroup_is_root(memcg)) {
-		struct memcg_shrinker_map *map;
+		struct memcg_shrinker_info *info;
 
 		rcu_read_lock();
-		map = rcu_dereference(memcg->nodeinfo[nid]->shrinker_map);
+		info = rcu_dereference(memcg->nodeinfo[nid]->shrinker_info);
 		/* Pairs with smp mb in shrink_slab() */
 		smp_mb__before_atomic();
-		set_bit(shrinker_id, map->map);
+		set_bit(shrinker_id, info->map);
 		rcu_read_unlock();
 	}
 }
@@ -330,7 +330,7 @@ static int prealloc_memcg_shrinker(struct shrinker *shrinker)
 		goto unlock;
 
 	if (id >= shrinker_nr_max) {
-		if (memcg_expand_shrinker_maps(id)) {
+		if (memcg_expand_shrinker_info(id)) {
 			idr_remove(&shrinker_idr, id);
 			goto unlock;
 		}
@@ -666,7 +666,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
 static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 			struct mem_cgroup *memcg, int priority)
 {
-	struct memcg_shrinker_map *map;
+	struct memcg_shrinker_info *info;
 	unsigned long ret, freed = 0;
 	int i;
 
@@ -676,12 +676,12 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 	if (!down_read_trylock(&shrinker_rwsem))
 		return 0;
 
-	map = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_map,
-					true);
-	if (unlikely(!map))
+	info = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_info,
+					 true);
+	if (unlikely(!info))
 		goto unlock;
 
-	for_each_set_bit(i, map->map, shrinker_nr_max) {
+	for_each_set_bit(i, info->map, shrinker_nr_max) {
 		struct shrink_control sc = {
 			.gfp_mask = gfp_mask,
 			.nid = nid,
@@ -692,7 +692,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 		shrinker = idr_find(&shrinker_idr, i);
 		if (unlikely(!shrinker || shrinker == SHRINKER_REGISTERING)) {
 			if (!shrinker)
-				clear_bit(i, map->map);
+				clear_bit(i, info->map);
 			continue;
 		}
 
@@ -703,7 +703,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
 
 		ret = do_shrink_slab(&sc, shrinker, priority);
 		if (ret == SHRINK_EMPTY) {
-			clear_bit(i, map->map);
+			clear_bit(i, info->map);
 			/*
 			 * After the shrinker reported that it had no objects to
 			 * free, but before we cleared the corresponding bit in
-- 
2.26.2