Document 'tried_regions' directory in DAMON sysfs interface usage in the
administrator guide.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
Documentation/admin-guide/mm/damon/usage.rst | 44 ++++++++++++++++++--
1 file changed, 41 insertions(+), 3 deletions(-)
diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index b47b0cbbd491..649d63ecf67f 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -88,6 +88,9 @@ comma (","). ::
│ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
│ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low
│ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
+ │ │ │ │ │ │ │ tried_regions/
+ │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age
+ │ │ │ │ │ │ │ │ ...
│ │ │ │ │ │ ...
│ │ │ │ ...
│ │ ...
@@ -125,7 +128,14 @@ in the state. Writing ``commit`` to the ``state`` file makes kdamond reads the
user inputs in the sysfs files except ``state`` file again. Writing
``update_schemes_stats`` to ``state`` file updates the contents of stats files
for each DAMON-based operation scheme of the kdamond. For details of the
-stats, please refer to :ref:`stats section <sysfs_schemes_stats>`.
+stats, please refer to :ref:`stats section <sysfs_schemes_stats>`. Writing
+``update_schemes_regions`` to ``state`` file updates the DAMON-based operation
+scheme action tried regions directory for each DAMON-based operation scheme of
+the kdamond. Writing ``clear_schemes_regions`` to ``state`` file clears the
+DAMON-based operating scheme action tried regions directory for each
+DAMON-based operation scheme of the kdamond. For details of the DAMON-based
+operation scheme action tried regions directory, please refer to
+:ref:tried_regions section <sysfs_schemes_tried_regions>`.
If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread.
@@ -166,6 +176,8 @@ You can set and get what type of monitoring operations DAMON will use for the
context by writing one of the keywords listed in ``avail_operations`` file and
reading from the ``operations`` file.
+.. _sysfs_monitoring_attrs:
+
contexts/<N>/monitoring_attrs/
------------------------------
@@ -252,8 +264,9 @@ to ``N-1``. Each directory represents each DAMON-based operation scheme.
schemes/<N>/
------------
-In each scheme directory, four directories (``access_pattern``, ``quotas``,
-``watermarks``, and ``stats``) and one file (``action``) exist.
+In each scheme directory, five directories (``access_pattern``, ``quotas``,
+``watermarks``, ``stats``, and ``tried_regions``) and one file (``action``)
+exist.
The ``action`` file is for setting and getting what action you want to apply to
memory regions having specific access pattern of the interest. The keywords
@@ -348,6 +361,31 @@ should ask DAMON sysfs interface to updte the content of the files for the
stats by writing a special keyword, ``update_schemes_stats`` to the relevant
``kdamonds/<N>/state`` file.
+.. _sysfs_schemes_tried_regions:
+
+schemes/<N>/tried_regions/
+--------------------------
+
+When a special keyword, ``update_schemes_regions``, is written to the relevant
+``kdamonds/<N>/state`` file, DAMON creates directories named integer starting
+from ``0`` under this directory. Each directory contains files exposing
+detailed information about each of the memory region that the corresponding
+scheme's ``action`` has tried to be applied under this directory, during next
+:ref:`aggregation interval <sysfs_monitoring_attrs>`. The information includes
+address range, ``nr_accesses``, , and ``age`` of the region.
+
+The directories will be removed when another special keyword,
+``clear_schemes_regions``, is written to the relevant ``kdamonds/<N>/state``
+file.
+
+tried_regions/<N>/
+------------------
+
+In each region directory, you will find four files (``start``, ``end``,
+``nr_accesses``, and ``age``). Reading the files will show the start and end
+addresses, ``nr_accesses``, and ``age`` of the region that corresponding
+DAMON-based operation scheme ``action`` has tried to be applied.
+
Example
~~~~~~~
--
2.25.1
