The patch titled
Subject: Docs/admin-guide/mm/damon/usage: update for tried_regions/total_bytes
has been added to the -mm mm-unstable branch. Its filename is
docs-admin-guide-mm-damon-usage-update-for-tried_regions-total_bytes.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/docs-admin-guide-mm-damon-usage-update-for-tried_regions-total_bytes.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: Docs/admin-guide/mm/damon/usage: update for tried_regions/total_bytes
Date: Wed, 2 Aug 2023 21:32:21 +0000
Update the DAMON usage document for newly added
schemes/.../tried_regions/total_bytes file and the
update_schemes_tried_bytes command.
Link: https://lkml.kernel.org/r/20230802213222.109841-6-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/mm/damon/usage.rst | 42 ++++++++++-------
1 file changed, 27 insertions(+), 15 deletions(-)
--- a/Documentation/admin-guide/mm/damon/usage.rst~docs-admin-guide-mm-damon-usage-update-for-tried_regions-total_bytes
+++ a/Documentation/admin-guide/mm/damon/usage.rst
@@ -87,7 +87,7 @@ comma (","). ::
â?? â?? â?? â?? â?? â?? â?? filters/nr_filters
â?? â?? â?? â?? â?? â?? â?? â?? 0/type,matching,memcg_id
â?? â?? â?? â?? â?? â?? â?? stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
- â?? â?? â?? â?? â?? â?? â?? tried_regions/
+ â?? â?? â?? â?? â?? â?? â?? tried_regions/total_bytes
â?? â?? â?? â?? â?? â?? â?? â?? 0/start,end,nr_accesses,age
â?? â?? â?? â?? â?? â?? â?? â?? ...
â?? â?? â?? â?? â?? â?? ...
@@ -127,14 +127,18 @@ in the state. Writing ``commit`` to 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>`. Writing
-``update_schemes_tried_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_tried_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>`.
+stats, please refer to :ref:`stats section <sysfs_schemes_stats>`.
+
+Writing ``update_schemes_tried_regions`` to ``state`` file updates the
+DAMON-based operation scheme action tried regions directory for each
+DAMON-based operation scheme of the kdamond. Writing
+``update_schemes_tried_bytes`` to ``state`` file updates only
+``.../tried_regions/total_bytes`` files. Writing
+``clear_schemes_tried_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.
@@ -406,13 +410,21 @@ stats by writing a special keyword, ``up
schemes/<N>/tried_regions/
--------------------------
+This directory initially has one file, ``total_bytes``.
+
When a special keyword, ``update_schemes_tried_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.
+relevant ``kdamonds/<N>/state`` file, DAMON updates the ``total_bytes`` file so
+that reading it returns the total size of the scheme tried regions, and 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.
+
+Writing ``update_schemes_tried_bytes`` to the relevant ``kdamonds/<N>/state``
+file will only update the ``total_bytes`` file, and will not create the
+subdirectories.
The directories will be removed when another special keyword,
``clear_schemes_tried_regions``, is written to the relevant
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-core-initialize-damo_filter-list-from-damos_new_filter.patch
mm-damon-core-test-add-a-test-for-damos_new_filter.patch
mm-damon-sysfs-schemes-implement-damos-tried-total-bytes-file.patch
mm-damon-sysfs-implement-a-command-for-updating-only-schemes-tried-total-bytes.patch
selftests-damon-sysfs-test-tried_regions-total_bytes-file.patch
docs-abi-damon-update-for-tried_regions-total_bytes.patch
docs-admin-guide-mm-damon-usage-update-for-tried_regions-total_bytes.patch
