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author | SeongJae Park <sj@kernel.org> | 2022-11-02 01:03:27 +0300 |
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committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-01 02:58:45 +0300 |
commit | 7f0a86f3c99bc9736445ef64aa65c9bd6161a47b (patch) | |
tree | 01901491e130d26bb5726da57172cf95ce2a2895 /Documentation/admin-guide/mm | |
parent | 2b3ee3f66c673312ea377bcfb54cb2b9abc8473b (diff) | |
download | linux-7f0a86f3c99bc9736445ef64aa65c9bd6161a47b.tar.xz |
Docs/admin-guide/mm/damon/usage: document schemes/<s>/tried_regions sysfs directory
Document 'tried_regions' directory in DAMON sysfs interface usage in the
administrator guide.
Link: https://lkml.kernel.org/r/20221101220328.95765-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide/mm')
-rw-r--r-- | Documentation/admin-guide/mm/damon/usage.rst | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index c17e02e1e426..1a5b6b71efa1 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -88,6 +88,9 @@ comma (","). :: │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low │ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds + │ │ │ │ │ │ │ tried_regions/ + │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age + │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... │ │ ... @@ -125,7 +128,14 @@ 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>`. +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 ``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>`. If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread. @@ -166,6 +176,8 @@ You can set and get what type of monitoring operations DAMON will use for the context by writing one of the keywords listed in ``avail_operations`` file and reading from the ``operations`` file. +.. _sysfs_monitoring_attrs: + contexts/<N>/monitoring_attrs/ ------------------------------ @@ -255,8 +267,9 @@ to ``N-1``. Each directory represents each DAMON-based operation scheme. schemes/<N>/ ------------ -In each scheme directory, four directories (``access_pattern``, ``quotas``, -``watermarks``, and ``stats``) and one file (``action``) exist. +In each scheme directory, five directories (``access_pattern``, ``quotas``, +``watermarks``, ``stats``, and ``tried_regions``) and one file (``action``) +exist. The ``action`` file is for setting and getting what action you want to apply to memory regions having specific access pattern of the interest. The keywords @@ -351,6 +364,32 @@ should ask DAMON sysfs interface to updte the content of the files for the stats by writing a special keyword, ``update_schemes_stats`` to the relevant ``kdamonds/<N>/state`` file. +.. _sysfs_schemes_tried_regions: + +schemes/<N>/tried_regions/ +-------------------------- + +When a special keyword, ``update_schemes_tried_regions``, is written to the +relevant ``kdamonds/<N>/state`` file, DAMON creates directories named integer +starting from ``0`` under this directory. Each directory contains files +exposing detailed information about each of the memory region that the +corresponding scheme's ``action`` has tried to be applied under this directory, +during next :ref:`aggregation interval <sysfs_monitoring_attrs>`. The +information includes address range, ``nr_accesses``, , and ``age`` of the +region. + +The directories will be removed when another special keyword, +``clear_schemes_tried_regions``, is written to the relevant +``kdamonds/<N>/state`` file. + +tried_regions/<N>/ +------------------ + +In each region directory, you will find four files (``start``, ``end``, +``nr_accesses``, and ``age``). Reading the files will show the start and end +addresses, ``nr_accesses``, and ``age`` of the region that corresponding +DAMON-based operation scheme ``action`` has tried to be applied. + Example ~~~~~~~ |