[PATCH 2/6] mm: memcontrol: replace zone summing with lruvec_page_state()

[Johannes Weiner <hannes@xxxxxxxxxxx>]

Instead of adding up the zone counters, use lruvec_page_state() to get
the node state directly. This is a bit cheaper and more stream-lined.

Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 include/linux/memcontrol.h | 18 ------------------
 mm/memcontrol.c            |  2 +-
 mm/vmscan.c                |  2 +-
 3 files changed, 2 insertions(+), 20 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 83ae11cbd12c..206090de5d7c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -499,19 +499,6 @@ void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
 					   int nid, unsigned int lru_mask);
 
-static inline
-unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
-{
-	struct mem_cgroup_per_node *mz;
-	unsigned long nr_pages = 0;
-	int zid;
-
-	mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
-	for (zid = 0; zid < MAX_NR_ZONES; zid++)
-		nr_pages += mz->lru_zone_size[zid][lru];
-	return nr_pages;
-}
-
 static inline
 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
 		enum lru_list lru, int zone_idx)
@@ -947,11 +934,6 @@ static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
 	return true;
 }
 
-static inline unsigned long
-mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
-{
-	return 0;
-}
 static inline
 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
 		enum lru_list lru, int zone_idx)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index af7f18b32389..a04177f25758 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -730,7 +730,7 @@ unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
 	for_each_lru(lru) {
 		if (!(BIT(lru) & lru_mask))
 			continue;
-		nr += mem_cgroup_get_lru_size(lruvec, lru);
+		nr += lruvec_page_state(lruvec, NR_LRU_BASE + lru);
 	}
 	return nr;
 }
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e979705bbf32..f88fef03fc04 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -346,7 +346,7 @@ unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone
 	int zid;
 
 	if (!mem_cgroup_disabled())
-		lru_size = mem_cgroup_get_lru_size(lruvec, lru);
+		lru_size = lruvec_page_state(lruvec, NR_LRU_BASE + lru);
 	else
 		lru_size = node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru);
 
-- 
2.20.1