Docs/admin-guide/mm/damon/usage: update for memcg damon filter

Update DAMON usage document for the newly added belonging memory cgroup
attribute monitoring feature.

Link: https://lore.kernel.org/20260518234119.97569-29-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 5cf55ff6de31e182fb3db21e5f6b4e63a1417d63..0d6a27dc97b0a306a937f786b35ada8773125bd7 100644 (file)
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -74,7 +74,7 @@ comma (",").
     │ │ │ │ │ │ nr_regions/min,max
     │ │ │ │ │ │ :ref:`probes <damon_usage_sysfs_probes>`/nr_probes
     │ │ │ │ │ │ │ 0/filters/nr_filters
-    │ │ │ │ │ │ │ │ 0/type,matching,allow
+    │ │ │ │ │ │ │ │ 0/type,matching,allow,path
     │ │ │ │ │ │ │ │ ...
     │ │ │ │ │ │ │ ...
     │ │ │ │ │ :ref:`targets <sysfs_targets>`/nr_targets
@@ -289,7 +289,9 @@ the data attribute for the probe.
 In the beginning, ``filters`` directory has only one file, ``nr_filters``.
 Writing a number (``N``) to the file creates the number of child directories
 named ``0`` to ``N-1``.  Each directory represents each filter and works in a
-way similar to that for :ref:`DAMOS filter <sysfs_filters>`.
+way similar to that for :ref:`DAMOS filter <sysfs_filters>`.  When the filter
+``type`` is ``memcg``, ``path`` file acts as ``memcg_path`` for :ref:`DAMOS
+filter <sysfs_filters>`.
 
 .. _sysfs_targets: