From: Ying Han Date: Fri, 13 Jan 2012 01:18:27 +0000 (-0800) Subject: memcg: fix pgpgin/pgpgout documentation X-Git-Tag: upstream/snapshot3+hdmi~8349^2~65 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0527b6903b2838e214c895d527806aefd61b3c8f;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Acked-by: KAMEZAWA Hiroyuki Acked-by: Johannes Weiner Acked-by: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt index c7de7da..4c95c00 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.