Update DAMON usage document for the newly added report producer control
sysfs files.

Signed-off-by: SJ Park <sj@kernel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 35 ++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 6093b1c8fbfd9..644250c7bd681 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -115,6 +115,10 @@ comma (",").
     │ │ │ │ │ │ ...
     │ │ │ │ ...
     │ │ ...
+    │ reports/
+    │ │ producers/nr_producers
+    │ │ │ 0/report_type,producer_state
+    │ │ │ ...
 
 .. _sysfs_root:
 
@@ -729,6 +733,37 @@ Please note that it's highly recommended to use user space tools like `damo
 <https://github.com/damonitor/damo>`_ rather than manually reading and writing
 the files as above.  Above is only for an example.
 
+.. _damon_usage_sysfs_reports_producers:
+
+reports/producers/
+------------------
+
+Under the `admin/` directory, ``reports/producers/`` directory exists.  This
+directory is for configuring :ref:`DAMON report producers
+<damon_design_attr_reporting>`.  The file below exists in the directory.
+
+``nr_producers`` file is for generating report producers setup files.  Writing
+an integer ``N`` to the file creates the number of directories named ``0`` to
+``N-1``.  Each number-named directory is for configuring each report producer
+and called "producer directory".
+
+reports/producers/<N>/
+----------------------
+
+Files below exist in each producer directory.
+
+``report_type`` file is for setting the type of the report to produce.  Users
+can set the type by writing the type name to the file.  Reading the file shows
+the last successfully written input.  Refer to the :ref:`design document
+<damon_design_attr_reporting>` for the list of supported report types.
+
+``producer_state`` file is for reading and updating the state.  Reading it
+shows ``on`` or ``off`` if the producer is enabled or disabled, respectively.
+Users can write below keywords for the producer to the file.
+
+- ``on``: Enable the producer.
+- ``off``: Disable the producer.
+
 .. _tracepoint:
 
 Tracepoints for Monitoring Results
-- 
2.47.3