mm: memcg: group swapped-out statistics counter logically

The counter of currently swapped out pages in a memcg (hierarchy) is
sitting amidst ever-increasing event counters.  Move this item to the
other counters that reflect current state rather than history.

This technically breaks the kernel ABI, but hopefully nobody relies on the
order of items in memory.stat.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ying Han <yinghan@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b7b230606f2c..1118e02a40b6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4043,9 +4043,9 @@ enum {
         MCS_CACHE,
         MCS_RSS,
         MCS_FILE_MAPPED,
+        MCS_SWAP,
         MCS_PGPGIN,
         MCS_PGPGOUT,
-        MCS_SWAP,
         MCS_PGFAULT,
         MCS_PGMAJFAULT,
         MCS_INACTIVE_ANON,
@@ -4064,9 +4064,9 @@ static const char *memcg_stat_strings[NR_MCS_STAT] = {
         "cache",
         "rss",
         "mapped_file",
+        "swap",
         "pgpgin",
         "pgpgout",
-        "swap",
         "pgfault",
         "pgmajfault",
         "inactive_anon",