slab: reorganize memcg_cache_params

We're going to change how memcg caches are iterated.  In preparation,
clean up and reorganize memcg_cache_params.

* The shared ->list is replaced by ->children in root and
  ->children_node in children.

* ->is_root_cache is removed.  Instead ->root_cache is moved out of
  the child union and now used by both root and children.  NULL
  indicates root cache.  Non-NULL a memcg one.

This patch doesn't cause any observable behavior changes.

Link: http://lkml.kernel.org/r/20170117235411.9408-5-tj@kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 16 insertions, 15 deletions

diff --git a/mm/slab.h b/mm/slab.h
index d07563f..3ed3336 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -206,12 +206,12 @@ int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
  * slab_mutex.
  */
 #define for_each_memcg_cache(iter, root) \
-	list_for_each_entry(iter, &(root)->memcg_params.list, \
-			    memcg_params.list)
+	list_for_each_entry(iter, &(root)->memcg_params.children, \
+			    memcg_params.children_node)
 
 static inline bool is_root_cache(struct kmem_cache *s)
 {
-	return s->memcg_params.is_root_cache;
+	return !s->memcg_params.root_cache;
 }
 
 static inline bool slab_equal_or_root(struct kmem_cache *s,
diff --git a/mm/slab_common.c b/mm/slab_common.c
index ac469c8..c388503 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -140,9 +140,9 @@ int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t nr,
 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
 void slab_init_memcg_params(struct kmem_cache *s)
 {
-	s->memcg_params.is_root_cache = true;
-	INIT_LIST_HEAD(&s->memcg_params.list);
+	s->memcg_params.root_cache = NULL;
 	RCU_INIT_POINTER(s->memcg_params.memcg_caches, NULL);
+	INIT_LIST_HEAD(&s->memcg_params.children);
 }
 
 static int init_memcg_params(struct kmem_cache *s,
@@ -150,10 +150,10 @@ static int init_memcg_params(struct kmem_cache *s,
 {
 	struct memcg_cache_array *arr;
 
-	if (memcg) {
-		s->memcg_params.is_root_cache = false;
-		s->memcg_params.memcg = memcg;
+	if (root_cache) {
 		s->memcg_params.root_cache = root_cache;
+		s->memcg_params.memcg = memcg;
+		INIT_LIST_HEAD(&s->memcg_params.children_node);
 		return 0;
 	}
 
@@ -223,7 +223,7 @@ int memcg_update_all_caches(int num_memcgs)
 
 static void unlink_memcg_cache(struct kmem_cache *s)
 {
-	list_del(&s->memcg_params.list);
+	list_del(&s->memcg_params.children_node);
 }
 #else
 static inline int init_memcg_params(struct kmem_cache *s,
@@ -594,7 +594,8 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg,
 		goto out_unlock;
 	}
 
-	list_add(&s->memcg_params.list, &root_cache->memcg_params.list);
+	list_add(&s->memcg_params.children_node,
+		 &root_cache->memcg_params.children);
 
 	/*
 	 * Since readers won't lock (see cache_from_memcg_idx()), we need a
@@ -690,7 +691,7 @@ static int shutdown_memcg_caches(struct kmem_cache *s)
 			 * list so as not to try to destroy it for a second
 			 * time while iterating over inactive caches below.
 			 */
-			list_move(&c->memcg_params.list, &busy);
+			list_move(&c->memcg_params.children_node, &busy);
 		else
 			/*
 			 * The cache is empty and will be destroyed soon. Clear
@@ -705,17 +706,17 @@ static int shutdown_memcg_caches(struct kmem_cache *s)
 	 * Second, shutdown all caches left from memory cgroups that are now
 	 * offline.
 	 */
-	list_for_each_entry_safe(c, c2, &s->memcg_params.list,
-				 memcg_params.list)
+	list_for_each_entry_safe(c, c2, &s->memcg_params.children,
+				 memcg_params.children_node)
 		shutdown_cache(c);
 
-	list_splice(&busy, &s->memcg_params.list);
+	list_splice(&busy, &s->memcg_params.children);
 
 	/*
 	 * A cache being destroyed must be empty. In particular, this means
 	 * that all per memcg caches attached to it must be empty too.
 	 */
-	if (!list_empty(&s->memcg_params.list))
+	if (!list_empty(&s->memcg_params.children))
 		return -EBUSY;
 	return 0;
 }