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-rw-r--r--mm/memcontrol.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 0e13b2aeea61..eb1004f207b3 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1306,8 +1306,13 @@ int mem_cgroup_swappiness(struct mem_cgroup *memcg)
* rcu_read_unlock()
* start move here.
*/
+
+/* for quick checking without looking up memcg */
+atomic_t memcg_moving __read_mostly;
+
static void mem_cgroup_start_move(struct mem_cgroup *memcg)
{
+ atomic_inc(&memcg_moving);
atomic_inc(&memcg->moving_account);
synchronize_rcu();
}
@@ -1318,8 +1323,10 @@ static void mem_cgroup_end_move(struct mem_cgroup *memcg)
* Now, mem_cgroup_clear_mc() may call this function with NULL.
* We check NULL in callee rather than caller.
*/
- if (memcg)
+ if (memcg) {
+ atomic_dec(&memcg_moving);
atomic_dec(&memcg->moving_account);
+ }
}
/*