[123/151] memcg: fix memory.memsw.usage_in_bytes for root cgroup

[Greg KH]

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>

commit cd9b45b78a61e8df250e69385c74e729e5b66abf upstream.

A memory cgroup has a memory.memsw.usage_in_bytes file.  It shows the sum
of the usage of pages and swapents in the cgroup.  Presently the root
cgroup's memsw.usage_in_bytes shows the wrong value - the number of
swapents are not added.

So take MEM_CGROUP_STAT_SWAPOUT into account.

Signed-off-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Reviewed-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 mm/memcontrol.c |    1 +
 1 file changed, 1 insertion(+)

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2541,6 +2541,7 @@ static u64 mem_cgroup_read(struct cgroup
 			val += idx_val;
 			mem_cgroup_get_recursive_idx_stat(mem,
 				MEM_CGROUP_STAT_SWAPOUT, &idx_val);
+			val += idx_val;
 			val <<= PAGE_SHIFT;
 		} else
 			val = res_counter_read_u64(&mem->memsw, name);


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