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-rw-r--r--Documentation/admin-guide/mm/damon/usage.rst147
1 files changed, 104 insertions, 43 deletions
diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index da94feb97ed1..9d23144bf985 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -59,41 +59,47 @@ Files Hierarchy
The files hierarchy of DAMON sysfs interface is shown below. In the below
figure, parents-children relations are represented with indentations, each
directory is having ``/`` suffix, and files in each directory are separated by
-comma (","). ::
-
- /sys/kernel/mm/damon/admin
- │ kdamonds/nr_kdamonds
- │ │ 0/state,pid
- │ │ │ contexts/nr_contexts
- │ │ │ │ 0/avail_operations,operations
- │ │ │ │ │ monitoring_attrs/
+comma (",").
+
+.. parsed-literal::
+
+ :ref:`/sys/kernel/mm/damon <sysfs_root>`/admin
+ │ :ref:`kdamonds <sysfs_kdamonds>`/nr_kdamonds
+ │ │ :ref:`0 <sysfs_kdamond>`/state,pid
+ │ │ │ :ref:`contexts <sysfs_contexts>`/nr_contexts
+ │ │ │ │ :ref:`0 <sysfs_context>`/avail_operations,operations
+ │ │ │ │ │ :ref:`monitoring_attrs <sysfs_monitoring_attrs>`/
│ │ │ │ │ │ intervals/sample_us,aggr_us,update_us
│ │ │ │ │ │ nr_regions/min,max
- │ │ │ │ │ targets/nr_targets
- │ │ │ │ │ │ 0/pid_target
- │ │ │ │ │ │ │ regions/nr_regions
- │ │ │ │ │ │ │ │ 0/start,end
+ │ │ │ │ │ :ref:`targets <sysfs_targets>`/nr_targets
+ │ │ │ │ │ │ :ref:`0 <sysfs_target>`/pid_target
+ │ │ │ │ │ │ │ :ref:`regions <sysfs_regions>`/nr_regions
+ │ │ │ │ │ │ │ │ :ref:`0 <sysfs_region>`/start,end
│ │ │ │ │ │ │ │ ...
│ │ │ │ │ │ ...
- │ │ │ │ │ schemes/nr_schemes
- │ │ │ │ │ │ 0/action,apply_interval_us
- │ │ │ │ │ │ │ access_pattern/
+ │ │ │ │ │ :ref:`schemes <sysfs_schemes>`/nr_schemes
+ │ │ │ │ │ │ :ref:`0 <sysfs_scheme>`/action,apply_interval_us
+ │ │ │ │ │ │ │ :ref:`access_pattern <sysfs_access_pattern>`/
│ │ │ │ │ │ │ │ sz/min,max
│ │ │ │ │ │ │ │ nr_accesses/min,max
│ │ │ │ │ │ │ │ age/min,max
- │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms
+ │ │ │ │ │ │ │ :ref:`quotas <sysfs_quotas>`/ms,bytes,reset_interval_ms
│ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
- │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low
- │ │ │ │ │ │ │ filters/nr_filters
+ │ │ │ │ │ │ │ │ :ref:`goals <sysfs_schemes_quota_goals>`/nr_goals
+ │ │ │ │ │ │ │ │ │ 0/target_value,current_value
+ │ │ │ │ │ │ │ :ref:`watermarks <sysfs_watermarks>`/metric,interval_us,high,mid,low
+ │ │ │ │ │ │ │ :ref:`filters <sysfs_filters>`/nr_filters
│ │ │ │ │ │ │ │ 0/type,matching,memcg_id
- │ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
- │ │ │ │ │ │ │ tried_regions/total_bytes
+ │ │ │ │ │ │ │ :ref:`stats <sysfs_schemes_stats>`/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
+ │ │ │ │ │ │ │ :ref:`tried_regions <sysfs_schemes_tried_regions>`/total_bytes
│ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age
│ │ │ │ │ │ │ │ ...
│ │ │ │ │ │ ...
│ │ │ │ ...
│ │ ...
+.. _sysfs_root:
+
Root
----
@@ -102,6 +108,8 @@ has one directory named ``admin``. The directory contains the files for
privileged user space programs' control of DAMON. User space tools or daemons
having the root permission could use this directory.
+.. _sysfs_kdamonds:
+
kdamonds/
---------
@@ -113,6 +121,8 @@ 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/<N>/
-------------
@@ -120,29 +130,37 @@ In each kdamond directory, two files (``state`` and ``pid``) and one directory
(``contexts``) exist.
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
-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
-``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>`.
+``off`` if it is not running.
+
+Users can write below commands for the kdamond to the ``state`` file.
+
+- ``on``: Start running.
+- ``off``: Stop running.
+- ``commit``: Read the user inputs in the sysfs files except ``state`` file
+ again.
+- ``commit_schemes_quota_goals``: Read the DAMON-based operation schemes'
+ :ref:`quota goals <sysfs_schemes_quota_goals>`.
+- ``update_schemes_stats``: Update 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>`.
+- ``update_schemes_tried_regions``: Update the DAMON-based operation 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>`.
+- ``update_schemes_tried_bytes``: Update only ``.../tried_regions/total_bytes``
+ files.
+- ``clear_schemes_tried_regions``: Clear the DAMON-based operating scheme
+ action tried regions directory for each DAMON-based operation scheme of the
+ kdamond.
If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread.
``contexts`` directory contains files for controlling the monitoring contexts
that this kdamond will execute.
+.. _sysfs_contexts:
+
kdamonds/<N>/contexts/
----------------------
@@ -153,7 +171,7 @@ number (``N``) to the file creates the number of child directories named as
details). At the moment, only one context per kdamond is supported, so only
``0`` or ``1`` can be written to the file.
-.. _sysfs_contexts:
+.. _sysfs_context:
contexts/<N>/
-------------
@@ -203,6 +221,8 @@ writing to and rading from the files.
For more details about the intervals and monitoring regions range, please refer
to the Design document (:doc:`/mm/damon/design`).
+.. _sysfs_targets:
+
contexts/<N>/targets/
---------------------
@@ -210,6 +230,8 @@ In the beginning, this directory has only one file, ``nr_targets``. Writing a
number (``N``) to the file creates the number of child directories named ``0``
to ``N-1``. Each directory represents each monitoring target.
+.. _sysfs_target:
+
targets/<N>/
------------
@@ -244,6 +266,8 @@ In the beginning, this directory has only one file, ``nr_regions``. Writing a
number (``N``) to the file creates the number of child directories named ``0``
to ``N-1``. Each directory represents each initial monitoring target region.
+.. _sysfs_region:
+
regions/<N>/
------------
@@ -254,6 +278,8 @@ region by writing to and reading from the files, respectively.
Each region should not overlap with others. ``end`` of directory ``N`` should
be equal or smaller than ``start`` of directory ``N+1``.
+.. _sysfs_schemes:
+
contexts/<N>/schemes/
---------------------
@@ -265,6 +291,8 @@ In the beginning, this directory has only one file, ``nr_schemes``. Writing a
number (``N``) to the file creates the number of child directories named ``0``
to ``N-1``. Each directory represents each DAMON-based operation scheme.
+.. _sysfs_scheme:
+
schemes/<N>/
------------
@@ -277,7 +305,7 @@ The ``action`` file is for setting and getting the scheme's :ref:`action
from the file and their meaning are as below.
Note that support of each action depends on the running DAMON operations set
-:ref:`implementation <sysfs_contexts>`.
+:ref:`implementation <sysfs_context>`.
- ``willneed``: Call ``madvise()`` for the region with ``MADV_WILLNEED``.
Supported by ``vaddr`` and ``fvaddr`` operations set.
@@ -299,6 +327,8 @@ Note that support of each action depends on the running DAMON operations set
The ``apply_interval_us`` file is for setting and getting the scheme's
:ref:`apply_interval <damon_design_damos>` in microseconds.
+.. _sysfs_access_pattern:
+
schemes/<N>/access_pattern/
---------------------------
@@ -312,6 +342,8 @@ to and reading from the ``min`` and ``max`` files under ``sz``,
``nr_accesses``, and ``age`` directories, respectively. Note that the ``min``
and the ``max`` form a closed interval.
+.. _sysfs_quotas:
+
schemes/<N>/quotas/
-------------------
@@ -319,8 +351,7 @@ The directory for the :ref:`quotas <damon_design_damos_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 +361,37 @@ 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
<damon_design_damos_quotas_prioritization>` 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/<N>/quotas/goals/
+-------------------------
+
+The directory for the :ref:`automatic quota tuning goals
+<damon_design_damos_quotas_auto_tuning>` 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 <sysfs_kdamond>` to pass the feedback to DAMON.
+
+.. _sysfs_watermarks:
+
schemes/<N>/watermarks/
-----------------------
@@ -354,6 +411,8 @@ as below.
The ``interval`` should written in microseconds unit.
+.. _sysfs_filters:
+
schemes/<N>/filters/
--------------------
@@ -394,7 +453,7 @@ pages of all memory cgroups except ``/having_care_already``.::
echo N > 1/matching
Note that ``anon`` and ``memcg`` filters are currently supported only when
-``paddr`` :ref:`implementation <sysfs_contexts>` is being used.
+``paddr`` :ref:`implementation <sysfs_context>` is being used.
Also, memory regions that are filtered out by ``addr`` or ``target`` filters
are not counted as the scheme has tried to those, while regions that filtered
@@ -449,6 +508,8 @@ and query-like efficient data access monitoring results retrievals. For the
latter use case, in particular, users can set the ``action`` as ``stat`` and
set the ``access pattern`` as their interested pattern that they want to query.
+.. _sysfs_schemes_tried_region:
+
tried_regions/<N>/
------------------