Update DAMON usage document for the effective quota file of the DAMON
sysfs interface.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
Documentation/admin-guide/mm/damon/usage.rst | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index db6620b5bc0a..220ebbde7324 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -83,7 +83,7 @@ comma (",").
│ │ │ │ │ │ │ │ sz/min,max
│ │ │ │ │ │ │ │ nr_accesses/min,max
│ │ │ │ │ │ │ │ age/min,max
- │ │ │ │ │ │ │ :ref:`quotas <sysfs_quotas>`/ms,bytes,reset_interval_ms
+ │ │ │ │ │ │ │ :ref:`quotas <sysfs_quotas>`/ms,bytes,reset_interval_ms,effective_bytes
│ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
│ │ │ │ │ │ │ │ :ref:`goals <sysfs_schemes_quota_goals>`/nr_goals
│ │ │ │ │ │ │ │ │ 0/target_value,current_value
@@ -153,6 +153,9 @@ Users can write below commands for the kdamond to the ``state`` file.
- ``clear_schemes_tried_regions``: Clear the DAMON-based operating scheme
action tried regions directory for each DAMON-based operation scheme of the
kdamond.
+- ``update_schemes_effective_bytes``: Update the contents of
+ ``effective_bytes`` files for each DAMON-based operation scheme of the
+ kdamond. For more details, refer to :ref:`quotas directory <sysfs_quotas>`.
If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread.
@@ -320,8 +323,9 @@ schemes/<N>/quotas/
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 two directores (``weights`` and ``goals``) exist.
+Under ``quotas`` directory, four files (``ms``, ``bytes``,
+``reset_interval_ms``, ``effective_bytes``) 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,
@@ -332,6 +336,15 @@ apply the action to only up to ``bytes`` bytes of memory regions within the
quota limits unless at least one :ref:`goal <sysfs_schemes_quota_goals>` is
set.
+The time quota is internally transformed to a size quota. Between the
+transformed size quota and user-specified size quota, smaller one is applied.
+Based on the user-specified :ref:`goal <sysfs_schemes_quota_goals>`, the
+effective size quota is further adjusted. Reading ``effective_bytes`` returns
+the current effective size quota. The file is not updated in real time, so
+users should ask DAMON sysfs interface to update the content of the file for
+the stats by writing a special keyword, ``update_schemes_effective_bytes`` to
+the relevant ``kdamonds/<N>/state`` file.
+
Under ``weights`` directory, three files (``sz_permil``,
``nr_accesses_permil``, and ``age_permil``) exist.
You can set the :ref:`prioritization weights
--
2.39.2
