memcg: fix memory.memsw.usage_in_bytes for root cgroup
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@shutemov.name>
Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e0c2066..7b5b108 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2542,6 +2542,7 @@
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);