[PATCH 18/19] Docs/admin-guide/mm/damon/usage: document weight sysfs file
From: SJ Park <sj@kernel.org>
Date: 2026-07-10 13:47:06
Also in:
damon, linux-mm, lkml
Subsystem:
damon, documentation, memory management - misc, the rest · Maintainers:
SeongJae Park, Jonathan Corbet, Andrew Morton, David Hildenbrand, Linus Torvalds
Update DAMON usage document for newly added probe weight file. Signed-off-by: SJ Park <sj@kernel.org> --- Documentation/admin-guide/mm/damon/usage.rst | 11 ++++++++--- Documentation/mm/damon/design.rst | 5 +++++ 2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index b2649ea011f93..da5f9afd08aef 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst@@ -73,9 +73,10 @@ comma (","). │ │ │ │ │ │ │ intervals_goal/access_bp,aggrs,min_sample_us,max_sample_us │ │ │ │ │ │ nr_regions/min,max │ │ │ │ │ │ :ref:`probes <damon_usage_sysfs_probes>`/nr_probes - │ │ │ │ │ │ │ 0/filters/nr_filters - │ │ │ │ │ │ │ │ 0/type,matching,allow,path - │ │ │ │ │ │ │ │ ... + │ │ │ │ │ │ │ 0/weight + │ │ │ │ │ │ │ │ filters/nr_filters + │ │ │ │ │ │ │ │ │ 0/type,matching,allow,path + │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ ... │ │ │ │ │ :ref:`targets <sysfs_targets>`/nr_targets │ │ │ │ │ │ :ref:`0 <sysfs_target>`/pid_target,obsolete_target
@@ -286,6 +287,10 @@ In each probe directory, one directory, ``filters`` exists. The directory contains files for installing filters for the probe, that is used to determine the data attribute for the probe. +Each probe directory also contains ``weight`` file. Reading from and writing +to the file gets and sets the :ref:`attributes-only monitoring +<damon_design_attrs_only_monitoring>` weight for the attribute of the probe. + In the beginning, ``filters`` directory has only one file, ``nr_filters``. Writing a number (``N``) to the file creates the number of child directories named ``0`` to ``N-1``. Each directory represents each filter and works in a
diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index 6d79e7d69be84..aed6cb1cf4831 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst@@ -316,6 +316,8 @@ Another way to do this for higher accuracy is using :ref:`DAMOS filter information in page level. But, because it is operated in page level, the overhead is proportional to the size of the memory. +.. _damon_design_attrs_only_monitoring: + Data Attributes-only Monitoring ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -336,6 +338,9 @@ automatically turned off. The access counter (``nr_accesses``) will always be zero and not updated. Hence the mode is called Data Attributes "only" monitoring. +Refer to the :ref:`admin guide <damon_usage_sysfs_probes>` to know how users +can use the mode. + Dynamic Target Space Updates Handling ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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2.47.3