[RFC][PATCH 2/7] memcg: count reclaimable pages per zone

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

From: Ying Han <yinghan@google.com>

The number of reclaimable pages per zone is an useful information for
controling memory reclaim schedule. This patch exports it.

Signed-off-by: Ying Han <yinghan@google.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 include/linux/memcontrol.h |    2 ++
 mm/memcontrol.c            |   14 ++++++++++++++
 2 files changed, 16 insertions(+)

Index: mmotm-May6/mm/memcontrol.c
===================================================================
--- mmotm-May6.orig/mm/memcontrol.c
+++ mmotm-May6/mm/memcontrol.c
@@ -1198,6 +1198,20 @@ unsigned long mem_cgroup_zone_nr_pages(s
 	return MEM_CGROUP_ZSTAT(mz, lru);
 }
 
+unsigned long mem_cgroup_zone_reclaimable_pages(struct mem_cgroup *memcg,
+						int nid, int zid)
+{
+	unsigned long nr;
+	struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+
+	nr = MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_FILE) +
+		MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_FILE);
+	if (nr_swap_pages > 0)
+		nr += MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_ANON) +
+			MEM_CGROUP_ZSTAT(mz, NR_INACTIVE_ANON);
+	return nr;
+}
+
 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 						      struct zone *zone)
 {
Index: mmotm-May6/include/linux/memcontrol.h
===================================================================
--- mmotm-May6.orig/include/linux/memcontrol.h
+++ mmotm-May6/include/linux/memcontrol.h
@@ -108,6 +108,8 @@ extern void mem_cgroup_end_migration(str
  */
 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
+unsigned long
+mem_cgroup_zone_reclaimable_pages(struct mem_cgroup *memcg, int nid, int zid);
 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 				       struct zone *zone,

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