1 files changed, 351 insertions, 137 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d960151da5..8f2f1bb18c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -350,7 +350,7 @@ static void memcg_reparent_objcgs(struct mem_cgroup *memcg,
 
 /*
  * A lot of the calls to the cache allocation functions are expected to be
- * inlined by the compiler. Since the calls to memcg_slab_pre_alloc_hook() are
+ * inlined by the compiler. Since the calls to memcg_slab_post_alloc_hook() are
  * conditional to this static branch, we'll have to allow modules that does
  * kmem_cache_alloc and the such to see this symbol as well
  */
@@ -575,6 +575,136 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
 	return mz;
 }
 
+/* Subset of node_stat_item for memcg stats */
+static const unsigned int memcg_node_stat_items[] = {
+	NR_INACTIVE_ANON,
+	NR_ACTIVE_ANON,
+	NR_INACTIVE_FILE,
+	NR_ACTIVE_FILE,
+	NR_UNEVICTABLE,
+	NR_SLAB_RECLAIMABLE_B,
+	NR_SLAB_UNRECLAIMABLE_B,
+	WORKINGSET_REFAULT_ANON,
+	WORKINGSET_REFAULT_FILE,
+	WORKINGSET_ACTIVATE_ANON,
+	WORKINGSET_ACTIVATE_FILE,
+	WORKINGSET_RESTORE_ANON,
+	WORKINGSET_RESTORE_FILE,
+	WORKINGSET_NODERECLAIM,
+	NR_ANON_MAPPED,
+	NR_FILE_MAPPED,
+	NR_FILE_PAGES,
+	NR_FILE_DIRTY,
+	NR_WRITEBACK,
+	NR_SHMEM,
+	NR_SHMEM_THPS,
+	NR_FILE_THPS,
+	NR_ANON_THPS,
+	NR_KERNEL_STACK_KB,
+	NR_PAGETABLE,
+	NR_SECONDARY_PAGETABLE,
+#ifdef CONFIG_SWAP
+	NR_SWAPCACHE,
+#endif
+};
+
+static const unsigned int memcg_stat_items[] = {
+	MEMCG_SWAP,
+	MEMCG_SOCK,
+	MEMCG_PERCPU_B,
+	MEMCG_VMALLOC,
+	MEMCG_KMEM,
+	MEMCG_ZSWAP_B,
+	MEMCG_ZSWAPPED,
+};
+
+#define NR_MEMCG_NODE_STAT_ITEMS ARRAY_SIZE(memcg_node_stat_items)
+#define MEMCG_VMSTAT_SIZE (NR_MEMCG_NODE_STAT_ITEMS + \
+			   ARRAY_SIZE(memcg_stat_items))
+static int8_t mem_cgroup_stats_index[MEMCG_NR_STAT] __read_mostly;
+
+static void init_memcg_stats(void)
+{
+	int8_t i, j = 0;
+
+	BUILD_BUG_ON(MEMCG_NR_STAT >= S8_MAX);
+
+	for (i = 0; i < NR_MEMCG_NODE_STAT_ITEMS; ++i)
+		mem_cgroup_stats_index[memcg_node_stat_items[i]] = ++j;
+
+	for (i = 0; i < ARRAY_SIZE(memcg_stat_items); ++i)
+		mem_cgroup_stats_index[memcg_stat_items[i]] = ++j;
+}
+
+static inline int memcg_stats_index(int idx)
+{
+	return mem_cgroup_stats_index[idx] - 1;
+}
+
+struct lruvec_stats_percpu {
+	/* Local (CPU and cgroup) state */
+	long state[NR_MEMCG_NODE_STAT_ITEMS];
+
+	/* Delta calculation for lockless upward propagation */
+	long state_prev[NR_MEMCG_NODE_STAT_ITEMS];
+};
+
+struct lruvec_stats {
+	/* Aggregated (CPU and subtree) state */
+	long state[NR_MEMCG_NODE_STAT_ITEMS];
+
+	/* Non-hierarchical (CPU aggregated) state */
+	long state_local[NR_MEMCG_NODE_STAT_ITEMS];
+
+	/* Pending child counts during tree propagation */
+	long state_pending[NR_MEMCG_NODE_STAT_ITEMS];
+};
+
+unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
+{
+	struct mem_cgroup_per_node *pn;
+	long x;
+	int i;
+
+	if (mem_cgroup_disabled())
+		return node_page_state(lruvec_pgdat(lruvec), idx);
+
+	i = memcg_stats_index(idx);
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
+		return 0;
+
+	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
+	x = READ_ONCE(pn->lruvec_stats->state[i]);
+#ifdef CONFIG_SMP
+	if (x < 0)
+		x = 0;
+#endif
+	return x;
+}
+
+unsigned long lruvec_page_state_local(struct lruvec *lruvec,
+				      enum node_stat_item idx)
+{
+	struct mem_cgroup_per_node *pn;
+	long x;
+	int i;
+
+	if (mem_cgroup_disabled())
+		return node_page_state(lruvec_pgdat(lruvec), idx);
+
+	i = memcg_stats_index(idx);
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
+		return 0;
+
+	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
+	x = READ_ONCE(pn->lruvec_stats->state_local[i]);
+#ifdef CONFIG_SMP
+	if (x < 0)
+		x = 0;
+#endif
+	return x;
+}
+
 /* Subset of vm_event_item to report for memcg event stats */
 static const unsigned int memcg_vm_event_stat[] = {
 	PGPGIN,
@@ -606,11 +736,13 @@ static const unsigned int memcg_vm_event_stat[] = {
 };
 
 #define NR_MEMCG_EVENTS ARRAY_SIZE(memcg_vm_event_stat)
-static int mem_cgroup_events_index[NR_VM_EVENT_ITEMS] __read_mostly;
+static int8_t mem_cgroup_events_index[NR_VM_EVENT_ITEMS] __read_mostly;
 
 static void init_memcg_events(void)
 {
-	int i;
+	int8_t i;
+
+	BUILD_BUG_ON(NR_VM_EVENT_ITEMS >= S8_MAX);
 
 	for (i = 0; i < NR_MEMCG_EVENTS; ++i)
 		mem_cgroup_events_index[memcg_vm_event_stat[i]] = i + 1;
@@ -632,11 +764,11 @@ struct memcg_vmstats_percpu {
 	/* The above should fit a single cacheline for memcg_rstat_updated() */
 
 	/* Local (CPU and cgroup) page state & events */
-	long			state[MEMCG_NR_STAT];
+	long			state[MEMCG_VMSTAT_SIZE];
 	unsigned long		events[NR_MEMCG_EVENTS];
 
 	/* Delta calculation for lockless upward propagation */
-	long			state_prev[MEMCG_NR_STAT];
+	long			state_prev[MEMCG_VMSTAT_SIZE];
 	unsigned long		events_prev[NR_MEMCG_EVENTS];
 
 	/* Cgroup1: threshold notifications & softlimit tree updates */
@@ -646,15 +778,15 @@ struct memcg_vmstats_percpu {
 
 struct memcg_vmstats {
 	/* Aggregated (CPU and subtree) page state & events */
-	long			state[MEMCG_NR_STAT];
+	long			state[MEMCG_VMSTAT_SIZE];
 	unsigned long		events[NR_MEMCG_EVENTS];
 
 	/* Non-hierarchical (CPU aggregated) page state & events */
-	long			state_local[MEMCG_NR_STAT];
+	long			state_local[MEMCG_VMSTAT_SIZE];
 	unsigned long		events_local[NR_MEMCG_EVENTS];
 
 	/* Pending child counts during tree propagation */
-	long			state_pending[MEMCG_NR_STAT];
+	long			state_pending[MEMCG_VMSTAT_SIZE];
 	unsigned long		events_pending[NR_MEMCG_EVENTS];
 
 	/* Stats updates since the last flush */
@@ -715,6 +847,7 @@ static inline void memcg_rstat_updated(struct mem_cgroup *memcg, int val)
 {
 	struct memcg_vmstats_percpu *statc;
 	int cpu = smp_processor_id();
+	unsigned int stats_updates;
 
 	if (!val)
 		return;
@@ -722,8 +855,9 @@ static inline void memcg_rstat_updated(struct mem_cgroup *memcg, int val)
 	cgroup_rstat_updated(memcg->css.cgroup, cpu);
 	statc = this_cpu_ptr(memcg->vmstats_percpu);
 	for (; statc; statc = statc->parent) {
-		statc->stats_updates += abs(val);
-		if (statc->stats_updates < MEMCG_CHARGE_BATCH)
+		stats_updates = READ_ONCE(statc->stats_updates) + abs(val);
+		WRITE_ONCE(statc->stats_updates, stats_updates);
+		if (stats_updates < MEMCG_CHARGE_BATCH)
 			continue;
 
 		/*
@@ -731,9 +865,9 @@ static inline void memcg_rstat_updated(struct mem_cgroup *memcg, int val)
 		 * redundant. Avoid the overhead of the atomic update.
 		 */
 		if (!memcg_vmstats_needs_flush(statc->vmstats))
-			atomic64_add(statc->stats_updates,
+			atomic64_add(stats_updates,
 				     &statc->vmstats->stats_updates);
-		statc->stats_updates = 0;
+		WRITE_ONCE(statc->stats_updates, 0);
 	}
 }
 
@@ -785,7 +919,13 @@ static void flush_memcg_stats_dwork(struct work_struct *w)
 
 unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
 {
-	long x = READ_ONCE(memcg->vmstats->state[idx]);
+	long x;
+	int i = memcg_stats_index(idx);
+
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
+		return 0;
+
+	x = READ_ONCE(memcg->vmstats->state[i]);
 #ifdef CONFIG_SMP
 	if (x < 0)
 		x = 0;
@@ -815,20 +955,31 @@ static int memcg_state_val_in_pages(int idx, int val)
  * @idx: the stat item - can be enum memcg_stat_item or enum node_stat_item
  * @val: delta to add to the counter, can be negative
  */
-void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val)
+void __mod_memcg_state(struct mem_cgroup *memcg, enum memcg_stat_item idx,
+		       int val)
 {
+	int i = memcg_stats_index(idx);
+
 	if (mem_cgroup_disabled())
 		return;
 
-	__this_cpu_add(memcg->vmstats_percpu->state[idx], val);
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
+		return;
+
+	__this_cpu_add(memcg->vmstats_percpu->state[i], val);
 	memcg_rstat_updated(memcg, memcg_state_val_in_pages(idx, val));
 }
 
 /* idx can be of type enum memcg_stat_item or node_stat_item. */
 static unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx)
 {
-	long x = READ_ONCE(memcg->vmstats->state_local[idx]);
+	long x;
+	int i = memcg_stats_index(idx);
+
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
+		return 0;
 
+	x = READ_ONCE(memcg->vmstats->state_local[i]);
 #ifdef CONFIG_SMP
 	if (x < 0)
 		x = 0;
@@ -836,11 +987,16 @@ static unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx)
 	return x;
 }
 
-void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
-			      int val)
+static void __mod_memcg_lruvec_state(struct lruvec *lruvec,
+				     enum node_stat_item idx,
+				     int val)
 {
 	struct mem_cgroup_per_node *pn;
 	struct mem_cgroup *memcg;
+	int i = memcg_stats_index(idx);
+
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
+		return;
 
 	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
 	memcg = pn->memcg;
@@ -857,8 +1013,6 @@ void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 		case NR_ANON_MAPPED:
 		case NR_FILE_MAPPED:
 		case NR_ANON_THPS:
-		case NR_SHMEM_PMDMAPPED:
-		case NR_FILE_PMDMAPPED:
 			WARN_ON_ONCE(!in_task());
 			break;
 		default:
@@ -867,10 +1021,10 @@ void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 	}
 
 	/* Update memcg */
-	__this_cpu_add(memcg->vmstats_percpu->state[idx], val);
+	__this_cpu_add(memcg->vmstats_percpu->state[i], val);
 
 	/* Update lruvec */
-	__this_cpu_add(pn->lruvec_stats_percpu->state[idx], val);
+	__this_cpu_add(pn->lruvec_stats_percpu->state[i], val);
 
 	memcg_rstat_updated(memcg, memcg_state_val_in_pages(idx, val));
 	memcg_stats_unlock();
@@ -952,34 +1106,38 @@ void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val)
 void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
 			  unsigned long count)
 {
-	int index = memcg_events_index(idx);
+	int i = memcg_events_index(idx);
+
+	if (mem_cgroup_disabled())
+		return;
 
-	if (mem_cgroup_disabled() || index < 0)
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, idx))
 		return;
 
 	memcg_stats_lock();
-	__this_cpu_add(memcg->vmstats_percpu->events[index], count);
+	__this_cpu_add(memcg->vmstats_percpu->events[i], count);
 	memcg_rstat_updated(memcg, count);
 	memcg_stats_unlock();
 }
 
 static unsigned long memcg_events(struct mem_cgroup *memcg, int event)
 {
-	int index = memcg_events_index(event);
+	int i = memcg_events_index(event);
 
-	if (index < 0)
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, event))
 		return 0;
-	return READ_ONCE(memcg->vmstats->events[index]);
+
+	return READ_ONCE(memcg->vmstats->events[i]);
 }
 
 static unsigned long memcg_events_local(struct mem_cgroup *memcg, int event)
 {
-	int index = memcg_events_index(event);
+	int i = memcg_events_index(event);
 
-	if (index < 0)
+	if (WARN_ONCE(i < 0, "%s: missing stat item %d\n", __func__, event))
 		return 0;
 
-	return READ_ONCE(memcg->vmstats->events_local[index]);
+	return READ_ONCE(memcg->vmstats->events_local[i]);
 }
 
 static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
@@ -2030,8 +2188,6 @@ static bool mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
 		if (current->in_user_fault) {
 			css_get(&memcg->css);
 			current->memcg_in_oom = memcg;
-			current->memcg_oom_gfp_mask = mask;
-			current->memcg_oom_order = order;
 		}
 		return false;
 	}
@@ -2310,6 +2466,7 @@ static void memcg_account_kmem(struct mem_cgroup *memcg, int nr_pages)
 static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 {
 	struct memcg_stock_pcp *stock;
+	unsigned int stock_pages;
 	unsigned long flags;
 	bool ret = false;
 
@@ -2319,8 +2476,9 @@ static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 	local_lock_irqsave(&memcg_stock.stock_lock, flags);
 
 	stock = this_cpu_ptr(&memcg_stock);
-	if (memcg == READ_ONCE(stock->cached) && stock->nr_pages >= nr_pages) {
-		stock->nr_pages -= nr_pages;
+	stock_pages = READ_ONCE(stock->nr_pages);
+	if (memcg == READ_ONCE(stock->cached) && stock_pages >= nr_pages) {
+		WRITE_ONCE(stock->nr_pages, stock_pages - nr_pages);
 		ret = true;
 	}
 
@@ -2334,16 +2492,18 @@ static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
  */
 static void drain_stock(struct memcg_stock_pcp *stock)
 {
+	unsigned int stock_pages = READ_ONCE(stock->nr_pages);
 	struct mem_cgroup *old = READ_ONCE(stock->cached);
 
 	if (!old)
 		return;
 
-	if (stock->nr_pages) {
-		page_counter_uncharge(&old->memory, stock->nr_pages);
+	if (stock_pages) {
+		page_counter_uncharge(&old->memory, stock_pages);
 		if (do_memsw_account())
-			page_counter_uncharge(&old->memsw, stock->nr_pages);
-		stock->nr_pages = 0;
+			page_counter_uncharge(&old->memsw, stock_pages);
+
+		WRITE_ONCE(stock->nr_pages, 0);
 	}
 
 	css_put(&old->css);
@@ -2369,8 +2529,7 @@ static void drain_local_stock(struct work_struct *dummy)
 	clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags);
 
 	local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
-	if (old)
-		obj_cgroup_put(old);
+	obj_cgroup_put(old);
 }
 
 /*
@@ -2380,6 +2539,7 @@ static void drain_local_stock(struct work_struct *dummy)
 static void __refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 {
 	struct memcg_stock_pcp *stock;
+	unsigned int stock_pages;
 
 	stock = this_cpu_ptr(&memcg_stock);
 	if (READ_ONCE(stock->cached) != memcg) { /* reset if necessary */
@@ -2387,9 +2547,10 @@ static void __refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 		css_get(&memcg->css);
 		WRITE_ONCE(stock->cached, memcg);
 	}
-	stock->nr_pages += nr_pages;
+	stock_pages = READ_ONCE(stock->nr_pages) + nr_pages;
+	WRITE_ONCE(stock->nr_pages, stock_pages);
 
-	if (stock->nr_pages > MEMCG_CHARGE_BATCH)
+	if (stock_pages > MEMCG_CHARGE_BATCH)
 		drain_stock(stock);
 }
 
@@ -2428,7 +2589,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
 
 		rcu_read_lock();
 		memcg = READ_ONCE(stock->cached);
-		if (memcg && stock->nr_pages &&
+		if (memcg && READ_ONCE(stock->nr_pages) &&
 		    mem_cgroup_is_descendant(memcg, root_memcg))
 			flush = true;
 		else if (obj_stock_flush_required(stock, root_memcg))
@@ -2978,21 +3139,10 @@ void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg)
 }
 
 #ifdef CONFIG_MEMCG_KMEM
-/*
- * The allocated objcg pointers array is not accounted directly.
- * Moreover, it should not come from DMA buffer and is not readily
- * reclaimable. So those GFP bits should be masked off.
- */
-#define OBJCGS_CLEAR_MASK	(__GFP_DMA | __GFP_RECLAIMABLE | \
-				 __GFP_ACCOUNT | __GFP_NOFAIL)
 
-/*
- * mod_objcg_mlstate() may be called with irq enabled, so
- * mod_memcg_lruvec_state() should be used.
- */
-static inline void mod_objcg_mlstate(struct obj_cgroup *objcg,
-				     struct pglist_data *pgdat,
-				     enum node_stat_item idx, int nr)
+static inline void __mod_objcg_mlstate(struct obj_cgroup *objcg,
+				       struct pglist_data *pgdat,
+				       enum node_stat_item idx, int nr)
 {
 	struct mem_cgroup *memcg;
 	struct lruvec *lruvec;
@@ -3000,66 +3150,31 @@ static inline void mod_objcg_mlstate(struct obj_cgroup *objcg,
 	rcu_read_lock();
 	memcg = obj_cgroup_memcg(objcg);
 	lruvec = mem_cgroup_lruvec(memcg, pgdat);
-	mod_memcg_lruvec_state(lruvec, idx, nr);
+	__mod_memcg_lruvec_state(lruvec, idx, nr);
 	rcu_read_unlock();
 }
 
-int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s,
-				 gfp_t gfp, bool new_slab)
-{
-	unsigned int objects = objs_per_slab(s, slab);
-	unsigned long memcg_data;
-	void *vec;
-
-	gfp &= ~OBJCGS_CLEAR_MASK;
-	vec = kcalloc_node(objects, sizeof(struct obj_cgroup *), gfp,
-			   slab_nid(slab));
-	if (!vec)
-		return -ENOMEM;
-
-	memcg_data = (unsigned long) vec | MEMCG_DATA_OBJCGS;
-	if (new_slab) {
-		/*
-		 * If the slab is brand new and nobody can yet access its
-		 * memcg_data, no synchronization is required and memcg_data can
-		 * be simply assigned.
-		 */
-		slab->memcg_data = memcg_data;
-	} else if (cmpxchg(&slab->memcg_data, 0, memcg_data)) {
-		/*
-		 * If the slab is already in use, somebody can allocate and
-		 * assign obj_cgroups in parallel. In this case the existing
-		 * objcg vector should be reused.
-		 */
-		kfree(vec);
-		return 0;
-	}
-
-	kmemleak_not_leak(vec);
-	return 0;
-}
-
 static __always_inline
 struct mem_cgroup *mem_cgroup_from_obj_folio(struct folio *folio, void *p)
 {
 	/*
 	 * Slab objects are accounted individually, not per-page.
 	 * Memcg membership data for each individual object is saved in
-	 * slab->memcg_data.
+	 * slab->obj_exts.
 	 */
 	if (folio_test_slab(folio)) {
-		struct obj_cgroup **objcgs;
+		struct slabobj_ext *obj_exts;
 		struct slab *slab;
 		unsigned int off;
 
 		slab = folio_slab(folio);
-		objcgs = slab_objcgs(slab);
-		if (!objcgs)
+		obj_exts = slab_obj_exts(slab);
+		if (!obj_exts)
 			return NULL;
 
 		off = obj_to_index(slab->slab_cache, slab, p);
-		if (objcgs[off])
-			return obj_cgroup_memcg(objcgs[off]);
+		if (obj_exts[off].objcg)
+			return obj_cgroup_memcg(obj_exts[off].objcg);
 
 		return NULL;
 	}
@@ -3067,7 +3182,7 @@ struct mem_cgroup *mem_cgroup_from_obj_folio(struct folio *folio, void *p)
 	/*
 	 * folio_memcg_check() is used here, because in theory we can encounter
 	 * a folio where the slab flag has been cleared already, but
-	 * slab->memcg_data has not been freed yet
+	 * slab->obj_exts has not been freed yet
 	 * folio_memcg_check() will guarantee that a proper memory
 	 * cgroup pointer or NULL will be returned.
 	 */
@@ -3145,8 +3260,7 @@ static struct obj_cgroup *current_objcg_update(void)
 		if (old) {
 			old = (struct obj_cgroup *)
 				((unsigned long)old & ~CURRENT_OBJCG_UPDATE_FLAG);
-			if (old)
-				obj_cgroup_put(old);
+			obj_cgroup_put(old);
 
 			old = NULL;
 		}
@@ -3356,7 +3470,7 @@ void __memcg_kmem_uncharge_page(struct page *page, int order)
 	obj_cgroup_put(objcg);
 }
 
-void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
+static void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
 		     enum node_stat_item idx, int nr)
 {
 	struct memcg_stock_pcp *stock;
@@ -3384,12 +3498,12 @@ void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
 		struct pglist_data *oldpg = stock->cached_pgdat;
 
 		if (stock->nr_slab_reclaimable_b) {
-			mod_objcg_mlstate(objcg, oldpg, NR_SLAB_RECLAIMABLE_B,
+			__mod_objcg_mlstate(objcg, oldpg, NR_SLAB_RECLAIMABLE_B,
 					  stock->nr_slab_reclaimable_b);
 			stock->nr_slab_reclaimable_b = 0;
 		}
 		if (stock->nr_slab_unreclaimable_b) {
-			mod_objcg_mlstate(objcg, oldpg, NR_SLAB_UNRECLAIMABLE_B,
+			__mod_objcg_mlstate(objcg, oldpg, NR_SLAB_UNRECLAIMABLE_B,
 					  stock->nr_slab_unreclaimable_b);
 			stock->nr_slab_unreclaimable_b = 0;
 		}
@@ -3415,11 +3529,10 @@ void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
 		}
 	}
 	if (nr)
-		mod_objcg_mlstate(objcg, pgdat, idx, nr);
+		__mod_objcg_mlstate(objcg, pgdat, idx, nr);
 
 	local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
-	if (old)
-		obj_cgroup_put(old);
+	obj_cgroup_put(old);
 }
 
 static bool consume_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes)
@@ -3482,13 +3595,13 @@ static struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock)
 	 */
 	if (stock->nr_slab_reclaimable_b || stock->nr_slab_unreclaimable_b) {
 		if (stock->nr_slab_reclaimable_b) {
-			mod_objcg_mlstate(old, stock->cached_pgdat,
+			__mod_objcg_mlstate(old, stock->cached_pgdat,
 					  NR_SLAB_RECLAIMABLE_B,
 					  stock->nr_slab_reclaimable_b);
 			stock->nr_slab_reclaimable_b = 0;
 		}
 		if (stock->nr_slab_unreclaimable_b) {
-			mod_objcg_mlstate(old, stock->cached_pgdat,
+			__mod_objcg_mlstate(old, stock->cached_pgdat,
 					  NR_SLAB_UNRECLAIMABLE_B,
 					  stock->nr_slab_unreclaimable_b);
 			stock->nr_slab_unreclaimable_b = 0;
@@ -3546,8 +3659,7 @@ static void refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes,
 	}
 
 	local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
-	if (old)
-		obj_cgroup_put(old);
+	obj_cgroup_put(old);
 
 	if (nr_pages)
 		obj_cgroup_uncharge_pages(objcg, nr_pages);
@@ -3602,6 +3714,96 @@ void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size)
 	refill_obj_stock(objcg, size, true);
 }
 
+static inline size_t obj_full_size(struct kmem_cache *s)
+{
+	/*
+	 * For each accounted object there is an extra space which is used
+	 * to store obj_cgroup membership. Charge it too.
+	 */
+	return s->size + sizeof(struct obj_cgroup *);
+}
+
+bool __memcg_slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *lru,
+				  gfp_t flags, size_t size, void **p)
+{
+	struct obj_cgroup *objcg;
+	struct slab *slab;
+	unsigned long off;
+	size_t i;
+
+	/*
+	 * The obtained objcg pointer is safe to use within the current scope,
+	 * defined by current task or set_active_memcg() pair.
+	 * obj_cgroup_get() is used to get a permanent reference.
+	 */
+	objcg = current_obj_cgroup();
+	if (!objcg)
+		return true;
+
+	/*
+	 * slab_alloc_node() avoids the NULL check, so we might be called with a
+	 * single NULL object. kmem_cache_alloc_bulk() aborts if it can't fill
+	 * the whole requested size.
+	 * return success as there's nothing to free back
+	 */
+	if (unlikely(*p == NULL))
+		return true;
+
+	flags &= gfp_allowed_mask;
+
+	if (lru) {
+		int ret;
+		struct mem_cgroup *memcg;
+
+		memcg = get_mem_cgroup_from_objcg(objcg);
+		ret = memcg_list_lru_alloc(memcg, lru, flags);
+		css_put(&memcg->css);
+
+		if (ret)
+			return false;
+	}
+
+	if (obj_cgroup_charge(objcg, flags, size * obj_full_size(s)))
+		return false;
+
+	for (i = 0; i < size; i++) {
+		slab = virt_to_slab(p[i]);
+
+		if (!slab_obj_exts(slab) &&
+		    alloc_slab_obj_exts(slab, s, flags, false)) {
+			obj_cgroup_uncharge(objcg, obj_full_size(s));
+			continue;
+		}
+
+		off = obj_to_index(s, slab, p[i]);
+		obj_cgroup_get(objcg);
+		slab_obj_exts(slab)[off].objcg = objcg;
+		mod_objcg_state(objcg, slab_pgdat(slab),
+				cache_vmstat_idx(s), obj_full_size(s));
+	}
+
+	return true;
+}
+
+void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab,
+			    void **p, int objects, struct slabobj_ext *obj_exts)
+{
+	for (int i = 0; i < objects; i++) {
+		struct obj_cgroup *objcg;
+		unsigned int off;
+
+		off = obj_to_index(s, slab, p[i]);
+		objcg = obj_exts[off].objcg;
+		if (!objcg)
+			continue;
+
+		obj_exts[off].objcg = NULL;
+		obj_cgroup_uncharge(objcg, obj_full_size(s));
+		mod_objcg_state(objcg, slab_pgdat(slab), cache_vmstat_idx(s),
+				-obj_full_size(s));
+		obj_cgroup_put(objcg);
+	}
+}
 #endif /* CONFIG_MEMCG_KMEM */
 
 /*
@@ -5431,26 +5633,33 @@ struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
 }
 #endif
 
-static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
+static bool alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 {
 	struct mem_cgroup_per_node *pn;
 
 	pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, node);
 	if (!pn)
-		return 1;
+		return false;
+
+	pn->lruvec_stats = kzalloc_node(sizeof(struct lruvec_stats),
+					GFP_KERNEL_ACCOUNT, node);
+	if (!pn->lruvec_stats)
+		goto fail;
 
 	pn->lruvec_stats_percpu = alloc_percpu_gfp(struct lruvec_stats_percpu,
 						   GFP_KERNEL_ACCOUNT);
-	if (!pn->lruvec_stats_percpu) {
-		kfree(pn);
-		return 1;
-	}
+	if (!pn->lruvec_stats_percpu)
+		goto fail;
 
 	lruvec_init(&pn->lruvec);
 	pn->memcg = memcg;
 
 	memcg->nodeinfo[node] = pn;
-	return 0;
+	return true;
+fail:
+	kfree(pn->lruvec_stats);
+	kfree(pn);
+	return false;
 }
 
 static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
@@ -5461,6 +5670,7 @@ static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 		return;
 
 	free_percpu(pn->lruvec_stats_percpu);
+	kfree(pn->lruvec_stats);
 	kfree(pn);
 }
 
@@ -5468,8 +5678,7 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg)
 {
 	int node;
 
-	if (memcg->orig_objcg)
-		obj_cgroup_put(memcg->orig_objcg);
+	obj_cgroup_put(memcg->orig_objcg);
 
 	for_each_node(node)
 		free_mem_cgroup_per_node_info(memcg, node);
@@ -5504,7 +5713,8 @@ static struct mem_cgroup *mem_cgroup_alloc(struct mem_cgroup *parent)
 		goto fail;
 	}
 
-	memcg->vmstats = kzalloc(sizeof(struct memcg_vmstats), GFP_KERNEL);
+	memcg->vmstats = kzalloc(sizeof(struct memcg_vmstats),
+				 GFP_KERNEL_ACCOUNT);
 	if (!memcg->vmstats)
 		goto fail;
 
@@ -5522,7 +5732,7 @@ static struct mem_cgroup *mem_cgroup_alloc(struct mem_cgroup *parent)
 	}
 
 	for_each_node(node)
-		if (alloc_mem_cgroup_per_node_info(memcg, node))
+		if (!alloc_mem_cgroup_per_node_info(memcg, node))
 			goto fail;
 
 	if (memcg_wb_domain_init(memcg, GFP_KERNEL))
@@ -5588,6 +5798,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
 		page_counter_init(&memcg->kmem, &parent->kmem);
 		page_counter_init(&memcg->tcpmem, &parent->tcpmem);
 	} else {
+		init_memcg_stats();
 		init_memcg_events();
 		page_counter_init(&memcg->memory, NULL);
 		page_counter_init(&memcg->swap, NULL);
@@ -5759,7 +5970,7 @@ static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
 
 	statc = per_cpu_ptr(memcg->vmstats_percpu, cpu);
 
-	for (i = 0; i < MEMCG_NR_STAT; i++) {
+	for (i = 0; i < MEMCG_VMSTAT_SIZE; i++) {
 		/*
 		 * Collect the aggregated propagation counts of groups
 		 * below us. We're in a per-cpu loop here and this is
@@ -5814,18 +6025,19 @@ static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
 
 	for_each_node_state(nid, N_MEMORY) {
 		struct mem_cgroup_per_node *pn = memcg->nodeinfo[nid];
-		struct mem_cgroup_per_node *ppn = NULL;
+		struct lruvec_stats *lstats = pn->lruvec_stats;
+		struct lruvec_stats *plstats = NULL;
 		struct lruvec_stats_percpu *lstatc;
 
 		if (parent)
-			ppn = parent->nodeinfo[nid];
+			plstats = parent->nodeinfo[nid]->lruvec_stats;
 
 		lstatc = per_cpu_ptr(pn->lruvec_stats_percpu, cpu);
 
-		for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
-			delta = pn->lruvec_stats.state_pending[i];
+		for (i = 0; i < NR_MEMCG_NODE_STAT_ITEMS; i++) {
+			delta = lstats->state_pending[i];
 			if (delta)
-				pn->lruvec_stats.state_pending[i] = 0;
+				lstats->state_pending[i] = 0;
 
 			delta_cpu = 0;
 			v = READ_ONCE(lstatc->state[i]);
@@ -5836,16 +6048,16 @@ static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
 			}
 
 			if (delta_cpu)
-				pn->lruvec_stats.state_local[i] += delta_cpu;
+				lstats->state_local[i] += delta_cpu;
 
 			if (delta) {
-				pn->lruvec_stats.state[i] += delta;
-				if (ppn)
-					ppn->lruvec_stats.state_pending[i] += delta;
+				lstats->state[i] += delta;
+				if (plstats)
+					plstats->state_pending[i] += delta;
 			}
 		}
 	}
-	statc->stats_updates = 0;
+	WRITE_ONCE(statc->stats_updates, 0);
 	/* We are in a per-cpu loop here, only do the atomic write once */
 	if (atomic64_read(&memcg->vmstats->stats_updates))
 		atomic64_set(&memcg->vmstats->stats_updates, 0);
@@ -6620,8 +6832,7 @@ static void mem_cgroup_exit(struct task_struct *task)
 
 	objcg = (struct obj_cgroup *)
 		((unsigned long)objcg & ~CURRENT_OBJCG_UPDATE_FLAG);
-	if (objcg)
-		obj_cgroup_put(objcg);
+	obj_cgroup_put(objcg);
 
 	/*
 	 * Some kernel allocations can happen after this point,
@@ -7448,6 +7659,9 @@ static void uncharge_folio(struct folio *folio, struct uncharge_gather *ug)
 	struct obj_cgroup *objcg;
 
 	VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
+	VM_BUG_ON_FOLIO(folio_order(folio) > 1 &&
+			!folio_test_hugetlb(folio) &&
+			!list_empty(&folio->_deferred_list), folio);
 
 	/*
 	 * Nobody should be changing or seriously looking at