[PATCH v2 9/9] Documentation: add ksm_stat description in cgroup-v2.rst

[xu . xin . sc]

From: xu xin <xu.xin16@xxxxxxxxxx>

This updates ksm_stat description in cgroup-v2.rst.

Signed-off-by: xu xin <xu.xin16@xxxxxxxxxx>
---
 Documentation/admin-guide/cgroup-v2.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 8fb14ffab7d1..acab4c9c6e25 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1718,6 +1718,18 @@ The following nested keys are defined.
 
 	The entries can refer to the memory.stat.
 
+  memory.ksm_stat
+        A read-only nested-keyed file.
+
+        The file can be used to observe the ksm merging status of the
+        processes within an memory cgroup. There are four items
+        including "ksm_rmap_items", "ksm_zero_pages", "ksm_merging_pages"
+        and "ksm_profit".
+
+        See
+        :ref:`Documentation/admin-guide/cgroup-v1/memory.rst ksm_stat <memcg_ksm_stat>`
+        for details.
+
   memory.swap.current
 	A read-only single value file which exists on non-root
 	cgroups.
-- 
2.15.2