|author||Ying Han <email@example.com>||2012-01-12 17:18:27 -0800|
|committer||Linus Torvalds <firstname.lastname@example.org>||2012-01-12 20:13:06 -0800|
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 <email@example.com> Acked-by: KAMEZAWA Hiroyuki <firstname.lastname@example.org> Acked-by: Johannes Weiner <email@example.com> Acked-by: Michal Hocko <firstname.lastname@example.org> Signed-off-by: Andrew Morton <email@example.com> Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index c7de7dac43b..4c95c0034a4 100644
@@ -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