[PATCH 07/11] memcg: make mem_cgroup_zone_nr_pages()

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

introduce mem_cgroup_zone_nr_pages().
it is called by zone_nr_pages() helper function.


this patch doesn't have any behavior change.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
 include/linux/memcontrol.h |   11 +++++++++++
 mm/memcontrol.c            |   12 +++++++++++-
 mm/vmscan.c                |    3 +++
 3 files changed, 25 insertions(+), 1 deletion(-)

Index: b/include/linux/memcontrol.h
===================================================================
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -92,6 +92,9 @@ extern long mem_cgroup_calc_reclaim(stru
 					int priority, enum lru_list lru);
 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
 				    struct zone *zone);
+unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
+				       struct zone *zone,
+				       enum lru_list lru);
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 extern int do_swap_account;
@@ -250,6 +253,14 @@ mem_cgroup_inactive_anon_is_low(struct m
 	return 1;
 }
 
+static inline unsigned long
+mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
+			 enum lru_list lru)
+{
+	return 0;
+}
+
+
 #endif /* CONFIG_CGROUP_MEM_CONT */
 
 #endif /* _LINUX_MEMCONTROL_H */
Index: b/mm/memcontrol.c
===================================================================
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -186,7 +186,6 @@ pcg_default_flags[NR_CHARGE_TYPE] = {
 	0, /* FORCE */
 };
 
-
 /* for encoding cft->private value on file */
 #define _MEM			(0)
 #define _MEMSWAP		(1)
@@ -448,6 +447,17 @@ int mem_cgroup_inactive_anon_is_low(stru
 	return 0;
 }
 
+unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
+				       struct zone *zone,
+				       enum lru_list lru)
+{
+	int nid = zone->zone_pgdat->node_id;
+	int zid = zone_idx(zone);
+	struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+
+	return MEM_CGROUP_ZSTAT(mz, lru);
+}
+
 unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
 					struct list_head *dst,
 					unsigned long *scanned, int order,
Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -140,6 +140,9 @@ static struct zone_reclaim_stat *get_rec
 static unsigned long zone_nr_pages(struct zone *zone, struct scan_control *sc,
 				   enum lru_list lru)
 {
+	if (!scan_global_lru(sc))
+		return mem_cgroup_zone_nr_pages(sc->mem_cgroup, zone, lru);
+
 	return zone_page_state(zone, NR_LRU_BASE + lru);
 }
 


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