1 files changed, 18 insertions, 0 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 31abd1c2c0c5..de54ea0094a1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1127,6 +1127,24 @@ static int mem_cgroup_count_children(struct mem_cgroup *mem)
 }
 
 /*
+ * Return the memory (and swap, if configured) limit for a memcg.
+ */
+u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
+{
+        u64 limit;
+        u64 memsw;
+
+        limit = res_counter_read_u64(&memcg->res, RES_LIMIT) +
+                        total_swap_pages;
+        memsw = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
+        /*
+         * If memsw is finite and limits the amount of swap space available
+         * to this memcg, return that limit.
+         */
+        return min(limit, memsw);
+}
+
+/*
  * Visit the first child (need not be the first child as per the ordering
  * of the cgroup list, since we track last_scanned_child) of @mem and use
  * that to reclaim free pages from.