linux-kernel - [PATCH 3/4] Docs/admin-guide/mm/damon/usage: document refresh

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Message-Id: <20250717055448.56976-4-sj@kernel.org>
Date: Wed, 16 Jul 2025 22:54:47 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 3/4] Docs/admin-guide/mm/damon/usage: document refresh_ms file

Document the new DAMON sysfs file, refresh_ms, on the usage document.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index fc5c962353ed..ff3a2dda1f02 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -59,7 +59,7 @@ comma (",").
 
     :ref:`/sys/kernel/mm/damon <sysfs_root>`/admin
     │ :ref:`kdamonds <sysfs_kdamonds>`/nr_kdamonds
-    │ │ :ref:`0 <sysfs_kdamond>`/state,pid
+    │ │ :ref:`0 <sysfs_kdamond>`/state,pid,refresh_ms
     │ │ │ :ref:`contexts <sysfs_contexts>`/nr_contexts
     │ │ │ │ :ref:`0 <sysfs_context>`/avail_operations,operations
     │ │ │ │ │ :ref:`monitoring_attrs <sysfs_monitoring_attrs>`/
@@ -123,8 +123,8 @@ kdamond.
 kdamonds/<N>/
 -------------
 
-In each kdamond directory, two files (``state`` and ``pid``) and one directory
-(``contexts``) exist.
+In each kdamond directory, three files (``state``, ``pid`` and ``refresh_ms``)
+and one directory (``contexts``) exist.
 
 Reading ``state`` returns ``on`` if the kdamond is currently running, or
 ``off`` if it is not running.
@@ -161,6 +161,13 @@ Users can write below commands for the kdamond to the ``state`` file.
 
 If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread.
 
+Users can ask the kernel to periodically update files showing auto-tuned
+parameters and DAMOS stats instead of manually writing
+``update_tuned_intervals`` like keywords to ``state`` file.  For this, users
+should write the desired update time interval in milliseconds to ``refresh_ms``
+file.  If the interval is zero, the periodic update is disabled.  Reading the
+file shows currently set time interval.
+
 ``contexts`` directory contains files for controlling the monitoring contexts
 that this kdamond will execute.
 
-- 
2.39.5