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Docs/admin-guide/mm/damon/usage: document effective_bytes file
Update DAMON usage document for the effective quota file of the DAMON sysfs interface. Link: https://lkml.kernel.org/r/20240219194431.159606-6-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -83,7 +83,7 @@ comma (",").
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│ │ │ │ │ │ │ │ sz/min,max
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│ │ │ │ │ │ │ │ nr_accesses/min,max
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│ │ │ │ │ │ │ │ age/min,max
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│ │ │ │ │ │ │ :ref:`quotas <sysfs_quotas>`/ms,bytes,reset_interval_ms
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│ │ │ │ │ │ │ :ref:`quotas <sysfs_quotas>`/ms,bytes,reset_interval_ms,effective_bytes
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│ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
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│ │ │ │ │ │ │ │ :ref:`goals <sysfs_schemes_quota_goals>`/nr_goals
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│ │ │ │ │ │ │ │ │ 0/target_value,current_value
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@ -153,6 +153,9 @@ Users can write below commands for the kdamond to the ``state`` file.
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- ``clear_schemes_tried_regions``: Clear the DAMON-based operating scheme
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action tried regions directory for each DAMON-based operation scheme of the
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kdamond.
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- ``update_schemes_effective_bytes``: Update the contents of
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``effective_bytes`` files for each DAMON-based operation scheme of the
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kdamond. For more details, refer to :ref:`quotas directory <sysfs_quotas>`.
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If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread.
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@ -320,8 +323,9 @@ schemes/<N>/quotas/
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The directory for the :ref:`quotas <damon_design_damos_quotas>` of the given
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DAMON-based operation scheme.
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Under ``quotas`` directory, three files (``ms``, ``bytes``,
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``reset_interval_ms``) and two directores (``weights`` and ``goals``) exist.
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Under ``quotas`` directory, four files (``ms``, ``bytes``,
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``reset_interval_ms``, ``effective_bytes``) and two directores (``weights`` and
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``goals``) exist.
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You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, and
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``reset interval`` in milliseconds by writing the values to the three files,
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@ -332,6 +336,15 @@ apply the action to only up to ``bytes`` bytes of memory regions within the
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quota limits unless at least one :ref:`goal <sysfs_schemes_quota_goals>` is
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set.
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The time quota is internally transformed to a size quota. Between the
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transformed size quota and user-specified size quota, smaller one is applied.
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Based on the user-specified :ref:`goal <sysfs_schemes_quota_goals>`, the
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effective size quota is further adjusted. Reading ``effective_bytes`` returns
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the current effective size quota. The file is not updated in real time, so
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users should ask DAMON sysfs interface to update the content of the file for
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the stats by writing a special keyword, ``update_schemes_effective_bytes`` to
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the relevant ``kdamonds/<N>/state`` file.
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Under ``weights`` directory, three files (``sz_permil``,
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``nr_accesses_permil``, and ``age_permil``) exist.
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You can set the :ref:`prioritization weights
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