1 files changed, 14 insertions, 0 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2ef214ed5cf8..78a928d90267 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -436,6 +436,20 @@ int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
         rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
         return (int)((rss * 100L) / total);
 }
+/*
+ * This function is called from vmscan.c. In page reclaiming loop. balance
+ * between active and inactive list is calculated. For memory controller
+ * page reclaiming, we should use using mem_cgroup's imbalance rather than
+ * zone's global lru imbalance.
+ */
+long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
+{
+        unsigned long active, inactive;
+        /* active and inactive are the number of pages. 'long' is ok.*/
+        active = mem_cgroup_get_all_zonestat(mem, MEM_CGROUP_ZSTAT_ACTIVE);
+        inactive = mem_cgroup_get_all_zonestat(mem, MEM_CGROUP_ZSTAT_INACTIVE);
+        return (long) (active / (inactive + 1));
+}
 
 unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
                                         struct list_head *dst,