mm: memcontrol: use node page state naming scheme for memcg

The memory controllers stat function names are awkwardly long and
arbitrarily different from the zone and node stat functions.

The current interface is named:

  mem_cgroup_read_stat()
  mem_cgroup_update_stat()
  mem_cgroup_inc_stat()
  mem_cgroup_dec_stat()
  mem_cgroup_update_page_stat()
  mem_cgroup_inc_page_stat()
  mem_cgroup_dec_page_stat()

This patch renames it to match the corresponding node stat functions:

  memcg_page_state()		[node_page_state()]
  mod_memcg_state()		[mod_node_state()]
  inc_memcg_state()		[inc_node_state()]
  dec_memcg_state()		[dec_node_state()]
  mod_memcg_page_state()	[mod_node_page_state()]
  inc_memcg_page_state()	[inc_node_page_state()]
  dec_memcg_page_state()	[dec_node_page_state()]

Link: http://lkml.kernel.org/r/20170404220148.28338-4-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/memcontrol.h

@@ -472,8 +472,8 @@ extern int do_swap_account;
 void lock_page_memcg(struct page *page);
 void unlock_page_memcg(struct page *page);
 
-static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup *memcg,
-						 enum memcg_stat_item idx)
+static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
+					     enum memcg_stat_item idx)
 {
 	long val = 0;
 	int cpu;
@@ -487,27 +487,27 @@ static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup *memcg,
 	return val;
 }
 
-static inline void mem_cgroup_update_stat(struct mem_cgroup *memcg,
-					  enum memcg_stat_item idx, int val)
+static inline void mod_memcg_state(struct mem_cgroup *memcg,
+				   enum memcg_stat_item idx, int val)
 {
 	if (!mem_cgroup_disabled())
 		this_cpu_add(memcg->stat->count[idx], val);
 }
 
-static inline void mem_cgroup_inc_stat(struct mem_cgroup *memcg,
-				       enum memcg_stat_item idx)
+static inline void inc_memcg_state(struct mem_cgroup *memcg,
+				   enum memcg_stat_item idx)
 {
-	mem_cgroup_update_stat(memcg, idx, 1);
+	mod_memcg_state(memcg, idx, 1);
 }
 
-static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
-				       enum memcg_stat_item idx)
+static inline void dec_memcg_state(struct mem_cgroup *memcg,
+				   enum memcg_stat_item idx)
 {
-	mem_cgroup_update_stat(memcg, idx, -1);
+	mod_memcg_state(memcg, idx, -1);
 }
 
 /**
- * mem_cgroup_update_page_stat - update page state statistics
+ * mod_memcg_page_state - update page state statistics
  * @page: the page
  * @idx: page state item to account
  * @val: number of pages (positive or negative)
@@ -518,28 +518,28 @@ static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
  *
  *   lock_page(page) or lock_page_memcg(page)
  *   if (TestClearPageState(page))
- *     mem_cgroup_update_page_stat(page, state, -1);
+ *     mod_memcg_page_state(page, state, -1);
  *   unlock_page(page) or unlock_page_memcg(page)
  *
  * Kernel pages are an exception to this, since they'll never move.
  */
-static inline void mem_cgroup_update_page_stat(struct page *page,
-				 enum memcg_stat_item idx, int val)
+static inline void mod_memcg_page_state(struct page *page,
+					enum memcg_stat_item idx, int val)
 {
 	if (page->mem_cgroup)
-		mem_cgroup_update_stat(page->mem_cgroup, idx, val);
+		mod_memcg_state(page->mem_cgroup, idx, val);
 }
 
-static inline void mem_cgroup_inc_page_stat(struct page *page,
-					    enum memcg_stat_item idx)
+static inline void inc_memcg_page_state(struct page *page,
+					enum memcg_stat_item idx)
 {
-	mem_cgroup_update_page_stat(page, idx, 1);
+	mod_memcg_page_state(page, idx, 1);
 }
 
-static inline void mem_cgroup_dec_page_stat(struct page *page,
-					    enum memcg_stat_item idx)
+static inline void dec_memcg_page_state(struct page *page,
+					enum memcg_stat_item idx)
 {
-	mem_cgroup_update_page_stat(page, idx, -1);
+	mod_memcg_page_state(page, idx, -1);
 }
 
 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
@@ -739,40 +739,41 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
 	return false;
 }
 
-static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup *memcg,
-						 enum mem_cgroup_stat_index idx)
+static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
+					     enum memcg_stat_item idx)
 {
 	return 0;
 }
 
-static inline void mem_cgroup_update_stat(struct mem_cgroup *memcg,
-					  enum memcg_stat_item idx, int val)
+static inline void mod_memcg_state(struct mem_cgroup *memcg,
+				   enum memcg_stat_item idx,
+				   int nr)
 {
 }
 
-static inline void mem_cgroup_inc_stat(struct mem_cgroup *memcg,
-				       enum memcg_stat_item idx)
+static inline void inc_memcg_state(struct mem_cgroup *memcg,
+				   enum memcg_stat_item idx)
 {
 }
 
-static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
-				       enum memcg_stat_item idx)
+static inline void dec_memcg_state(struct mem_cgroup *memcg,
+				   enum memcg_stat_item idx)
 {
 }
 
-static inline void mem_cgroup_update_page_stat(struct page *page,
-					       enum memcg_stat_item idx,
-					       int nr)
+static inline void mod_memcg_page_state(struct page *page,
+					enum memcg_stat_item idx,
+					int nr)
 {
 }
 
-static inline void mem_cgroup_inc_page_stat(struct page *page,
-					    enum memcg_stat_item idx)
+static inline void inc_memcg_page_state(struct page *page,
+					enum memcg_stat_item idx)
 {
 }
 
-static inline void mem_cgroup_dec_page_stat(struct page *page,
-					    enum memcg_stat_item idx)
+static inline void dec_memcg_page_state(struct page *page,
+					enum memcg_stat_item idx)
 {
 }
 

mm/memcontrol.c

@@ -552,8 +552,8 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
  * implemented.
  */
 
-static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
-					    enum memcg_event_item event)
+static unsigned long memcg_sum_events(struct mem_cgroup *memcg,
+				      enum memcg_event_item event)
 {
 	unsigned long val = 0;
 	int cpu;
@@ -1180,7 +1180,7 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 			if (memcg1_stats[i] == MEMCG_SWAP && !do_swap_account)
 				continue;
 			pr_cont(" %s:%luKB", memcg1_stat_names[i],
-				K(mem_cgroup_read_stat(iter, memcg1_stats[i])));
+				K(memcg_page_state(iter, memcg1_stats[i])));
 		}
 
 		for (i = 0; i < NR_LRU_LISTS; i++)
@@ -2713,7 +2713,7 @@ static void tree_stat(struct mem_cgroup *memcg, unsigned long *stat)
 
 	for_each_mem_cgroup_tree(iter, memcg) {
 		for (i = 0; i < MEMCG_NR_STAT; i++)
-			stat[i] += mem_cgroup_read_stat(iter, i);
+			stat[i] += memcg_page_state(iter, i);
 	}
 }
 
@@ -2726,7 +2726,7 @@ static void tree_events(struct mem_cgroup *memcg, unsigned long *events)
 
 	for_each_mem_cgroup_tree(iter, memcg) {
 		for (i = 0; i < MEMCG_NR_EVENTS; i++)
-			events[i] += mem_cgroup_read_events(iter, i);
+			events[i] += memcg_sum_events(iter, i);
 	}
 }
 
@@ -2738,10 +2738,10 @@ static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
 		struct mem_cgroup *iter;
 
 		for_each_mem_cgroup_tree(iter, memcg) {
-			val += mem_cgroup_read_stat(iter, MEMCG_CACHE);
-			val += mem_cgroup_read_stat(iter, MEMCG_RSS);
+			val += memcg_page_state(iter, MEMCG_CACHE);
+			val += memcg_page_state(iter, MEMCG_RSS);
 			if (swap)
-				val += mem_cgroup_read_stat(iter, MEMCG_SWAP);
+				val += memcg_page_state(iter, MEMCG_SWAP);
 		}
 	} else {
 		if (!swap)
@@ -3145,13 +3145,13 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 		if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
 			continue;
 		seq_printf(m, "%s %lu\n", memcg1_stat_names[i],
-			   mem_cgroup_read_stat(memcg, memcg1_stats[i]) *
+			   memcg_page_state(memcg, memcg1_stats[i]) *
 			   PAGE_SIZE);
 	}
 
 	for (i = 0; i < ARRAY_SIZE(memcg1_events); i++)
 		seq_printf(m, "%s %lu\n", memcg1_event_names[i],
-			   mem_cgroup_read_events(memcg, memcg1_events[i]));
+			   memcg_sum_events(memcg, memcg1_events[i]));
 
 	for (i = 0; i < NR_LRU_LISTS; i++)
 		seq_printf(m, "%s %lu\n", mem_cgroup_lru_names[i],
@@ -3175,7 +3175,7 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 		if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
 			continue;
 		for_each_mem_cgroup_tree(mi, memcg)
-			val += mem_cgroup_read_stat(mi, memcg1_stats[i]) *
+			val += memcg_page_state(mi, memcg1_stats[i]) *
 			PAGE_SIZE;
 		seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i], val);
 	}
@@ -3184,7 +3184,7 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 		unsigned long long val = 0;
 
 		for_each_mem_cgroup_tree(mi, memcg)
-			val += mem_cgroup_read_events(mi, memcg1_events[i]);
+			val += memcg_sum_events(mi, memcg1_events[i]);
 		seq_printf(m, "total_%s %llu\n", memcg1_event_names[i], val);
 	}
 
@@ -3650,10 +3650,10 @@ void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
 	struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css);
 	struct mem_cgroup *parent;
 
-	*pdirty = mem_cgroup_read_stat(memcg, NR_FILE_DIRTY);
+	*pdirty = memcg_page_state(memcg, NR_FILE_DIRTY);
 
 	/* this should eventually include NR_UNSTABLE_NFS */
-	*pwriteback = mem_cgroup_read_stat(memcg, NR_WRITEBACK);
+	*pwriteback = memcg_page_state(memcg, NR_WRITEBACK);
 	*pfilepages = mem_cgroup_nr_lru_pages(memcg, (1 << LRU_INACTIVE_FILE) |
 						     (1 << LRU_ACTIVE_FILE));
 	*pheadroom = PAGE_COUNTER_MAX;
@@ -4515,7 +4515,7 @@ static int mem_cgroup_move_account(struct page *page,
 
 	/*
 	 * move_lock grabbed above and caller set from->moving_account, so
-	 * mem_cgroup_update_page_stat() will serialize updates to PageDirty.
+	 * mod_memcg_page_state will serialize updates to PageDirty.
 	 * So mapping should be stable for dirty pages.
 	 */
 	if (!anon && PageDirty(page)) {
@@ -5161,10 +5161,10 @@ static int memory_events_show(struct seq_file *m, void *v)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
 
-	seq_printf(m, "low %lu\n", mem_cgroup_read_events(memcg, MEMCG_LOW));
-	seq_printf(m, "high %lu\n", mem_cgroup_read_events(memcg, MEMCG_HIGH));
-	seq_printf(m, "max %lu\n", mem_cgroup_read_events(memcg, MEMCG_MAX));
-	seq_printf(m, "oom %lu\n", mem_cgroup_read_events(memcg, MEMCG_OOM));
+	seq_printf(m, "low %lu\n", memcg_sum_events(memcg, MEMCG_LOW));
+	seq_printf(m, "high %lu\n", memcg_sum_events(memcg, MEMCG_HIGH));
+	seq_printf(m, "max %lu\n", memcg_sum_events(memcg, MEMCG_MAX));
+	seq_printf(m, "oom %lu\n", memcg_sum_events(memcg, MEMCG_OOM));
 
 	return 0;
 }

mm/page-writeback.c

@@ -2427,7 +2427,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
 		inode_attach_wb(inode, page);
 		wb = inode_to_wb(inode);
 
-		mem_cgroup_inc_page_stat(page, NR_FILE_DIRTY);
+		inc_memcg_page_state(page, NR_FILE_DIRTY);
 		__inc_node_page_state(page, NR_FILE_DIRTY);
 		__inc_zone_page_state(page, NR_ZONE_WRITE_PENDING);
 		__inc_node_page_state(page, NR_DIRTIED);
@@ -2449,7 +2449,7 @@ void account_page_cleaned(struct page *page, struct address_space *mapping,
 			  struct bdi_writeback *wb)
 {
 	if (mapping_cap_account_dirty(mapping)) {
-		mem_cgroup_dec_page_stat(page, NR_FILE_DIRTY);
+		dec_memcg_page_state(page, NR_FILE_DIRTY);
 		dec_node_page_state(page, NR_FILE_DIRTY);
 		dec_zone_page_state(page, NR_ZONE_WRITE_PENDING);
 		dec_wb_stat(wb, WB_RECLAIMABLE);
@@ -2706,7 +2706,7 @@ int clear_page_dirty_for_io(struct page *page)
 		 */
 		wb = unlocked_inode_to_wb_begin(inode, &locked);
 		if (TestClearPageDirty(page)) {
-			mem_cgroup_dec_page_stat(page, NR_FILE_DIRTY);
+			dec_memcg_page_state(page, NR_FILE_DIRTY);
 			dec_node_page_state(page, NR_FILE_DIRTY);
 			dec_zone_page_state(page, NR_ZONE_WRITE_PENDING);
 			dec_wb_stat(wb, WB_RECLAIMABLE);
@@ -2753,7 +2753,7 @@ int test_clear_page_writeback(struct page *page)
 		ret = TestClearPageWriteback(page);
 	}
 	if (ret) {
-		mem_cgroup_dec_page_stat(page, NR_WRITEBACK);
+		dec_memcg_page_state(page, NR_WRITEBACK);
 		dec_node_page_state(page, NR_WRITEBACK);
 		dec_zone_page_state(page, NR_ZONE_WRITE_PENDING);
 		inc_node_page_state(page, NR_WRITTEN);
@@ -2808,7 +2808,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
 		ret = TestSetPageWriteback(page);
 	}
 	if (!ret) {
-		mem_cgroup_inc_page_stat(page, NR_WRITEBACK);
+		inc_memcg_page_state(page, NR_WRITEBACK);
 		inc_node_page_state(page, NR_WRITEBACK);
 		inc_zone_page_state(page, NR_ZONE_WRITE_PENDING);
 	}

mm/rmap.c

@@ -1158,7 +1158,7 @@ void page_add_file_rmap(struct page *page, bool compound)
 			goto out;
 	}
 	__mod_node_page_state(page_pgdat(page), NR_FILE_MAPPED, nr);
-	mem_cgroup_update_page_stat(page, NR_FILE_MAPPED, nr);
+	mod_memcg_page_state(page, NR_FILE_MAPPED, nr);
 out:
 	unlock_page_memcg(page);
 }
@@ -1198,7 +1198,7 @@ static void page_remove_file_rmap(struct page *page, bool compound)
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
 	__mod_node_page_state(page_pgdat(page), NR_FILE_MAPPED, -nr);
-	mem_cgroup_update_page_stat(page, NR_FILE_MAPPED, -nr);
+	mod_memcg_page_state(page, NR_FILE_MAPPED, -nr);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);

mm/vmscan.c

@@ -2046,7 +2046,7 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
 	active = lruvec_lru_size(lruvec, active_lru, sc->reclaim_idx);
 
 	if (memcg)
-		refaults = mem_cgroup_read_stat(memcg, WORKINGSET_ACTIVATE);
+		refaults = memcg_page_state(memcg, WORKINGSET_ACTIVATE);
 	else
 		refaults = node_page_state(pgdat, WORKINGSET_ACTIVATE);
 
@@ -2733,8 +2733,7 @@ static void snapshot_refaults(struct mem_cgroup *root_memcg, pg_data_t *pgdat)
 		struct lruvec *lruvec;
 
 		if (memcg)
-			refaults = mem_cgroup_read_stat(memcg,
-							WORKINGSET_ACTIVATE);
+			refaults = memcg_page_state(memcg, WORKINGSET_ACTIVATE);
 		else
 			refaults = node_page_state(pgdat, WORKINGSET_ACTIVATE);
 

mm/workingset.c

@@ -289,11 +289,11 @@ bool workingset_refault(void *shadow)
 	refault_distance = (refault - eviction) & EVICTION_MASK;
 
 	inc_node_state(pgdat, WORKINGSET_REFAULT);
-	mem_cgroup_inc_stat(memcg, WORKINGSET_REFAULT);
+	inc_memcg_state(memcg, WORKINGSET_REFAULT);
 
 	if (refault_distance <= active_file) {
 		inc_node_state(pgdat, WORKINGSET_ACTIVATE);
-		mem_cgroup_inc_stat(memcg, WORKINGSET_ACTIVATE);
+		inc_memcg_state(memcg, WORKINGSET_ACTIVATE);
 		rcu_read_unlock();
 		return true;
 	}
@@ -475,7 +475,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
 	if (WARN_ON_ONCE(node->exceptional))
 		goto out_invalid;
 	inc_node_state(page_pgdat(virt_to_page(node)), WORKINGSET_NODERECLAIM);
-	mem_cgroup_inc_page_stat(virt_to_page(node), WORKINGSET_NODERECLAIM);
+	inc_memcg_page_state(virt_to_page(node), WORKINGSET_NODERECLAIM);
 	__radix_tree_delete_node(&mapping->page_tree, node,
 				 workingset_update_node, mapping);