mm, docs: update memory.stat description with workingset* entries

Commit 4b4cea91691d ("mm: vmscan: fix IO/refault regression in cache
workingset transition") introduced three new entries in memory stat
file:

 - workingset_refault
 - workingset_activate
 - workingset_nodereclaim

This commit adds a corresponding description to the cgroup v2 docs.

Link: http://lkml.kernel.org/r/1494530293-31236-1-git-send-email-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index e50b95c..dc5e2dc 100644 (file)
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -918,6 +918,18 @@ PAGE_SIZE multiple when read back.
 
                Number of major page faults incurred
 
+         workingset_refault
+
+               Number of refaults of previously evicted pages
+
+         workingset_activate
+
+               Number of refaulted pages that were immediately activated
+
+         workingset_nodereclaim
+
+               Number of times a shadow node has been reclaimed
+
   memory.swap.current
 
        A read-only single value file which exists on non-root