[PATCH 4/8] Docs/admin-guide/mm/damon/usage: document empty target regions commit behavior

[SeongJae Park <sj@kernel.org>]

Committing a monitoring target with empty target regions is for keeping
the current monitoring results.  This behavior was introduced by commit
973233600676 ("mm/damon/sysfs: update monitoring target regions for
online input commit").  The behavior is not documented, though.  Update
the usage document for clarifying this behavior.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index d8a3d6e740b3..9991dad60fcf 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -134,7 +134,8 @@ Users can write below commands for the kdamond to the ``state`` file.
 - ``on``: Start running.
 - ``off``: Stop running.
 - ``commit``: Read the user inputs in the sysfs files except ``state`` file
-  again.
+  again.  Monitoring :ref:`target region <sysfs_regions>` inputs are also be
+  ignored if no target region is specified.
 - ``update_tuned_intervals``: Update the contents of ``sample_us`` and
   ``aggr_us`` files of the kdamond with the auto-tuning applied ``sampling
   interval`` and ``aggregation interval`` for the files.  Please refer to
@@ -296,6 +297,11 @@ In the beginning, this directory has only one file, ``nr_regions``.  Writing a
 number (``N``) to the file creates the number of child directories named ``0``
 to ``N-1``.  Each directory represents each initial monitoring target region.
 
+If ``nr_regions`` is zero when committing new DAMON parameters online (writing
+``commit`` to ``state`` file of :ref:`kdamond <sysfs_kdamond>`), the commit
+logic ignores the target regions.  In other words, the current monitoring
+results for the target are preserved.
+
 .. _sysfs_region:
 
 regions/<N>/
-- 
2.47.3