1 files changed, 61 insertions, 13 deletions

diff --git a/mm/slab.h b/mm/slab.h
index 5d2b8511e6fb..7ead47cb9338 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -255,30 +255,67 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
 	return s->memcg_params.root_cache;
 }
 
+/*
+ * Expects a pointer to a slab page. Please note, that PageSlab() check
+ * isn't sufficient, as it returns true also for tail compound slab pages,
+ * which do not have slab_cache pointer set.
+ * So this function assumes that the page can pass PageHead() and PageSlab()
+ * checks.
+ */
+static inline struct mem_cgroup *memcg_from_slab_page(struct page *page)
+{
+	struct kmem_cache *s;
+
+	s = READ_ONCE(page->slab_cache);
+	if (s && !is_root_cache(s))
+		return s->memcg_params.memcg;
+
+	return NULL;
+}
+
+/*
+ * Charge the slab page belonging to the non-root kmem_cache.
+ * Can be called for non-root kmem_caches only.
+ */
 static __always_inline int memcg_charge_slab(struct page *page,
 					     gfp_t gfp, int order,
 					     struct kmem_cache *s)
 {
+	struct mem_cgroup *memcg;
+	struct lruvec *lruvec;
 	int ret;
 
-	if (is_root_cache(s))
-		return 0;
-
-	ret = memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
+	memcg = s->memcg_params.memcg;
+	ret = memcg_kmem_charge_memcg(page, gfp, order, memcg);
 	if (ret)
 		return ret;
 
+	lruvec = mem_cgroup_lruvec(page_pgdat(page), memcg);
+	mod_lruvec_state(lruvec, cache_vmstat_idx(s), 1 << order);
+
+	/* transer try_charge() page references to kmem_cache */
 	percpu_ref_get_many(&s->memcg_params.refcnt, 1 << order);
+	css_put_many(&memcg->css, 1 << order);
 
 	return 0;
 }
 
+/*
+ * Uncharge a slab page belonging to a non-root kmem_cache.
+ * Can be called for non-root kmem_caches only.
+ */
 static __always_inline void memcg_uncharge_slab(struct page *page, int order,
 						struct kmem_cache *s)
 {
-	if (!is_root_cache(s))
-		percpu_ref_put_many(&s->memcg_params.refcnt, 1 << order);
-	memcg_kmem_uncharge(page, order);
+	struct mem_cgroup *memcg;
+	struct lruvec *lruvec;
+
+	memcg = s->memcg_params.memcg;
+	lruvec = mem_cgroup_lruvec(page_pgdat(page), memcg);
+	mod_lruvec_state(lruvec, cache_vmstat_idx(s), -(1 << order));
+	memcg_kmem_uncharge_memcg(page, order, memcg);
+
+	percpu_ref_put_many(&s->memcg_params.refcnt, 1 << order);
 }
 
 extern void slab_init_memcg_params(struct kmem_cache *);
@@ -314,6 +351,11 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
 	return s;
 }
 
+static inline struct mem_cgroup *memcg_from_slab_page(struct page *page)
+{
+	return NULL;
+}
+
 static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
 				    struct kmem_cache *s)
 {
@@ -351,18 +393,24 @@ static __always_inline int charge_slab_page(struct page *page,
 					    gfp_t gfp, int order,
 					    struct kmem_cache *s)
 {
-	int ret = memcg_charge_slab(page, gfp, order, s);
-
-	if (!ret)
-		mod_lruvec_page_state(page, cache_vmstat_idx(s), 1 << order);
+	if (is_root_cache(s)) {
+		mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
+				    1 << order);
+		return 0;
+	}
 
-	return ret;
+	return memcg_charge_slab(page, gfp, order, s);
 }
 
 static __always_inline void uncharge_slab_page(struct page *page, int order,
 					       struct kmem_cache *s)
 {
-	mod_lruvec_page_state(page, cache_vmstat_idx(s), -(1 << order));
+	if (is_root_cache(s)) {
+		mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
+				    -(1 << order));
+		return;
+	}
+
 	memcg_uncharge_slab(page, order, s);
 }