Docs/mm/damon/design: document unmapped DAMOS filter type

Document availability and meaning of unmapped DAMOS filter type on design
document.  Since introduction of the type requires no additional user ABI,
usage and ABI document need no update.

Link: https://lkml.kernel.org/r/20250219220146.133650-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index 6a66aa0833fdda4a3eabf098b4e98f0ef9848fbd..5af991551a86847654708e4602ed9b636bd3b7a8 100644 (file)
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -617,6 +617,8 @@ Below ``type`` of filters are currently supported.
           scheme.
     - hugepage_size
         - Applied to pages that managed in a given size range.
+    - unmapped
+        - Applied to pages that unmapped.
 
 To know how user-space can set the filters via :ref:`DAMON sysfs interface
 <sysfs_interface>`, refer to :ref:`filters <sysfs_filters>` part of the