The quilt patch titled
Subject: Docs/admin-guide/mm/damon/usage: document DAMOS filter 'allow' sysfs file
has been removed from the -mm tree. Its filename was
docs-admin-guide-mm-damon-usage-document-damos-filter-allow-sysfs-file.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: Docs/admin-guide/mm/damon/usage: document DAMOS filter 'allow' sysfs file
Date: Thu, 9 Jan 2025 09:51:26 -0800
Update DAMON usage document for the newly added 'allow' sysfs file for
DAMOS filters.
Link: https://lkml.kernel.org/r/20250109175126.57878-11-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/mm/damon/usage.rst | 33 +++++++++--------
1 file changed, 19 insertions(+), 14 deletions(-)
--- a/Documentation/admin-guide/mm/damon/usage.rst~docs-admin-guide-mm-damon-usage-document-damos-filter-allow-sysfs-file
+++ a/Documentation/admin-guide/mm/damon/usage.rst
@@ -83,7 +83,7 @@ comma (",").
â?? â?? â?? â?? â?? â?? â?? â?? â?? 0/target_metric,target_value,current_value
â?? â?? â?? â?? â?? â?? â?? :ref:`watermarks <sysfs_watermarks>`/metric,interval_us,high,mid,low
â?? â?? â?? â?? â?? â?? â?? :ref:`filters <sysfs_filters>`/nr_filters
- â?? â?? â?? â?? â?? â?? â?? â?? 0/type,matching,memcg_id
+ â?? â?? â?? â?? â?? â?? â?? â?? 0/type,matching,memcg_id,allow
â?? â?? â?? â?? â?? â?? â?? :ref:`stats <sysfs_schemes_stats>`/nr_tried,sz_tried,nr_applied,sz_applied,sz_ops_filter_passed,qt_exceeds
â?? â?? â?? â?? â?? â?? â?? :ref:`tried_regions <sysfs_schemes_tried_regions>`/total_bytes
â?? â?? â?? â?? â?? â?? â?? â?? 0/start,end,nr_accesses,age,sz_filter_passed
@@ -406,13 +406,14 @@ number (``N``) to the file creates the n
to ``N-1``. Each directory represents each filter. The filters are evaluated
in the numeric order.
-Each filter directory contains six files, namely ``type``, ``matcing``,
-``memcg_path``, ``addr_start``, ``addr_end``, and ``target_idx``. To ``type``
-file, you can write one of five special keywords: ``anon`` for anonymous pages,
-``memcg`` for specific memory cgroup, ``young`` for young pages, ``addr`` for
-specific address range (an open-ended interval), or ``target`` for specific
-DAMON monitoring target filtering. Meaning of the types are same to the
-description on the :ref:`design doc <damon_design_damos_filters>`.
+Each filter directory contains seven files, namely ``type``, ``matching``,
+``allow``, ``memcg_path``, ``addr_start``, ``addr_end``, and ``target_idx``.
+To ``type`` file, you can write one of five special keywords: ``anon`` for
+anonymous pages, ``memcg`` for specific memory cgroup, ``young`` for young
+pages, ``addr`` for specific address range (an open-ended interval), or
+``target`` for specific DAMON monitoring target filtering. Meaning of the
+types are same to the description on the :ref:`design doc
+<damon_design_damos_filters>`.
In case of the memory cgroup filtering, you can specify the memory cgroup of
the interest by writing the path of the memory cgroup from the cgroups mount
@@ -422,25 +423,29 @@ specify the start and end address of the
you can specify the index of the target between the list of the DAMON context's
monitoring targets list to ``target_idx`` file.
-You can write ``Y`` or ``N`` to ``matching`` file to filter out pages that does
-or does not match to the type, respectively. Then, the scheme's action will
-not be applied to the pages that specified to be filtered out.
+You can write ``Y`` or ``N`` to ``matching`` file to specify whether the filter
+is for memory that matches the ``type``. You can write ``Y`` or ``N`` to
+``allow`` file to specify if applying the action to the memory that satisfies
+the ``type`` and ``matching`` should be allowed or not.
For example, below restricts a DAMOS action to be applied to only non-anonymous
pages of all memory cgroups except ``/having_care_already``.::
# echo 2 > nr_filters
- # # filter out anonymous pages
+ # # disallow anonymous pages
echo anon > 0/type
echo Y > 0/matching
+ echo N > 0/allow
# # further filter out all cgroups except one at '/having_care_already'
echo memcg > 1/type
echo /having_care_already > 1/memcg_path
echo Y > 1/matching
+ echo N > 1/allow
Refer to the :ref:`DAMOS filters design documentation
-<damon_design_damos_filters>` for more details including when each of the
-filters are supported and differences on stats.
+<damon_design_damos_filters>` for more details including how multiple filters
+of different ``allow`` works, when each of the filters are supported, and
+differences on stats.
.. _sysfs_schemes_stats:
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
docs-mm-damon-design-add-monitoring-parameters-tuning-guide.patch
docs-mm-damon-add-an-example-monitoring-intervals-tuning.patch
docs-admin-guide-mm-damon-usage-fix-and-add-missing-damos-filter-sysfs-files-on-files-hierarchy.patch
docs-admin-guide-mm-damon-start-update-snapshot-example.patch
mm-damon-explain-effective-quota-on-kernel-doc-comment.patch
