diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index da94feb97ed1..ff9f62e65722 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -83,6 +83,8 @@ comma (","). :: │ │ │ │ │ │ │ │ age/min,max │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil + │ │ │ │ │ │ │ │ goals/nr_goals + │ │ │ │ │ │ │ │ │ 0/target_value,current_value │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low │ │ │ │ │ │ │ filters/nr_filters │ │ │ │ │ │ │ │ 0/type,matching,memcg_id @@ -113,6 +115,8 @@ details) exists. In the beginning, this directory has only one file, child directories named ``0`` to ``N-1``. Each directory represents each kdamond. +.. _sysfs_kdamond: + kdamonds// ------------- @@ -121,11 +125,18 @@ In each kdamond directory, two files (``state`` and ``pid``) and one directory Reading ``state`` returns ``on`` if the kdamond is currently running, or ``off`` if it is not running. Writing ``on`` or ``off`` makes the kdamond be -in the state. Writing ``commit`` to the ``state`` file makes kdamond reads the +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 `. +``commit_schemes_quota_goals`` to the ``state`` file makes kdamond reads the +DAMON-based operation schemes' :ref:`quota goals ` +of the kdamond. + +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 +`. Writing ``update_schemes_tried_regions`` to ``state`` file updates the DAMON-based operation scheme action tried regions directory for each @@ -319,8 +330,7 @@ The directory for the :ref:`quotas ` of the given DAMON-based operation scheme. Under ``quotas`` directory, three files (``ms``, ``bytes``, -``reset_interval_ms``) and one directory (``weights``) having three files -(``sz_permil``, ``nr_accesses_permil``, and ``age_permil``) in it exist. +``reset_interval_ms``) and two directores (``weights`` and ``goals``) exist. You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, and ``reset interval`` in milliseconds by writing the values to the three files, @@ -330,11 +340,35 @@ apply the action to only up to ``bytes`` bytes of memory regions within the ``reset_interval_ms``. Setting both ``ms`` and ``bytes`` zero disables the quota limits. -You can also set the :ref:`prioritization weights +Under ``weights`` directory, three files (``sz_permil``, +``nr_accesses_permil``, and ``age_permil``) exist. +You can set the :ref:`prioritization weights ` for size, access frequency, and age in per-thousand unit by writing the values to the three files under the ``weights`` directory. +.. _sysfs_schemes_quota_goals: + +schemes//quotas/goals/ +------------------------- + +The directory for the :ref:`automatic quota tuning goals +` of the given DAMON-based operation +scheme. + +In the beginning, this directory has only one file, ``nr_goals``. Writing a +number (``N``) to the file creates the number of child directories named ``0`` +to ``N-1``. Each directory represents each goal and current achievement. +Among the multiple feedback, the best one is used. + +Each goal directory contains two files, namely ``target_value`` and +``current_value``. Users can set and get any number to those files to set the +feedback. User space main workload's latency or throughput, system metrics +like free memory ratio or memory pressure stall time (PSI) could be example +metrics for the values. Note that users should write +``commit_schemes_quota_goals`` to the ``state`` file of the :ref:`kdamond +directory ` to pass the feedback to DAMON. + schemes//watermarks/ ----------------------- diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 947c9df6cd33..8b4a49ac057d 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -346,6 +346,8 @@ the weight will be respected are up to the underlying prioritization mechanism implementation. +.. _damon_design_damos_quotas_auto_tuning: + Aim-oriented Feedback-driven Auto-tuning ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^