memcg: fix pgpgin/pgpgout documentation

The two memcg stats pgpgin/pgpgout have different meaning than the ones
in vmstat, which indicates that we picked a bad naming for them.

It might be late to change the stat name, but better documentation is
always helpful.

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

1 files changed, 5 insertions, 2 deletions

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index c7de7dac43b..4c95c0034a4 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -410,8 +410,11 @@ memory.stat file includes following statistics
 cache           - # of bytes of page cache memory.
 rss             - # of bytes of anonymous and swap cache memory.
 mapped_file     - # of bytes of mapped file (includes tmpfs/shmem)
-pgpgin          - # of pages paged in (equivalent to # of charging events).
-pgpgout         - # of pages paged out (equivalent to # of uncharging events).
+pgpgin          - # of charging events to the memory cgroup. The charging
+                event happens each time a page is accounted as either mapped
+                anon page(RSS) or cache page(Page Cache) to the cgroup.
+pgpgout         - # of uncharging events to the memory cgroup. The uncharging
+                event happens each time a page is unaccounted from the cgroup.
 swap            - # of bytes of swap usage
 inactive_anon   - # of bytes of anonymous memory and swap cache memory on
                 LRU list.