Documentation/admin-guide/cgroup-v2.rst: document why inactive_X + active_X may not...

[linux.git] / Documentation / admin-guide / cgroup-v2.rst

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 007ba86aef78e61dd83ddcb99c0f6c3a37b7eff6..6d13f2de6d69f3b2b5ae563499993fa37310855c 100644 (file)
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1288,7 +1288,12 @@ PAGE_SIZE multiple when read back.
          inactive_anon, active_anon, inactive_file, active_file, unevictable
                Amount of memory, swap-backed and filesystem-backed,
                on the internal memory management lists used by the
-               page reclaim algorithm
+               page reclaim algorithm.
+
+               As these represent internal list state (eg. shmem pages are on anon
+               memory management lists), inactive_foo + active_foo may not be equal to
+               the value for the foo counter, since the foo counter is type-based, not
+               list-based.
 
          slab_reclaimable
                Part of "slab" that might be reclaimed, such as