docs: cgroup: Note about sibling relative reclaim protection

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 97a9f8a046c5f90586c4c01fbe31f00c37509368..e0a659474fa47d6e75907a2772d4ddbf687bd8ab 100644 (file)
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1952,6 +1952,10 @@ When the reclaim targets ancestors of A, the effective protection of B is
 capped by the protection value configured for A (and any other intermediate
 ancestors between A and the target).
 
+To express indifference about relative sibling protection, it is suggested to
+use memory_recursiveprot. Configuring all descendants of a parent with finite
+protection to "max" works but it may unnecessarily skew memory.events:low
+field.
 
 Memory Ownership
 ~~~~~~~~~~~~~~~~