[RFC][PATCH v3 3/10] memcg: a test whether zone is reclaimable or not

[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.

Changelog v2->v3:
  - added comments.

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            |   24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

Index: memcg_async/mm/memcontrol.c
===================================================================
--- memcg_async.orig/mm/memcontrol.c
+++ memcg_async/mm/memcontrol.c
@@ -1240,6 +1240,30 @@ static unsigned long mem_cgroup_nr_lru_p
 }
 #endif /* CONFIG_NUMA */
 
+/**
+ * mem_cgroup_zone_reclaimable_pages
+ * @memcg: the memcg
+ * @nid  : node index to be checked.
+ * @zid  : zone index to be checked.
+ *
+ * This function returns the number reclaimable pages on a zone for given memcg.
+ * Reclaimable page includes file caches and anonymous pages if swap is
+ * avaliable and never includes unevictable pages.
+ */
+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: memcg_async/include/linux/memcontrol.h
===================================================================
--- memcg_async.orig/include/linux/memcontrol.h
+++ memcg_async/include/linux/memcontrol.h
@@ -109,6 +109,8 @@ 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_lru_pages(struct mem_cgroup *memcg,
 						struct zone *zone,

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