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Howlett" , Andrew Morton , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2.1 21/28] Docs/admin-guide/mm/damon/usage: document data attributes monitoring Date: Thu, 14 May 2026 07:08:54 -0700 Message-ID: <20260514140904.119781-22-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260514140904.119781-1-sj@kernel.org> References: <20260514140904.119781-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: B2A06120009 X-Rspam-User: X-Stat-Signature: t81ojnuup1gw5wrb1ge5r34ty9ff1rf1 X-HE-Tag: 1778767766-419357 X-HE-Meta: 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 ZO3dI9Po 077/Y7rZf7N18e8Fsf3+H5/kJtp0DrpklOE+OJJ+Mt2tXJPiXIGO+Ra/ECPXnI0RP5INPBiIHUGAzf2Z29I1+luhUVDGrN1+CQZQ6Vdk+VhxSEFGm4o5S78kv1losn10Jc1gm7kk/TYMLuzOqLlRMKuVeLj+xK+/YEiS9dGlHxIim75B/t35jf1XQrC7Wp6jgv4NDbM4hY62mgHhrDA8go4mhIWwO13rJ0fdzMkhmgeKwecnfOKt+UbABDRWCkR8K+U19NxnasUu0v2kJD/XKt4KkL4C5KB5rJ+cLewYxWn/XNthjQlc5lT1EPA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Update DAMON usage document for the newly added data attributes monitoring feature. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 46 +++++++++++++++++--- Documentation/mm/damon/design.rst | 2 + 2 files changed, 41 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index 11c75a598393c..465bcdf89b182 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -72,6 +72,11 @@ comma (","). │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us │ │ │ │ │ │ │ intervals_goal/access_bp,aggrs,min_sample_us,max_sample_us │ │ │ │ │ │ nr_regions/min,max + │ │ │ │ │ │ :ref:`probes `/nr_probes + │ │ │ │ │ │ │ 0/filters/nr_filters + │ │ │ │ │ │ │ │ │ 0/type,matching,allow + │ │ │ │ │ │ │ │ │ ... + │ │ │ │ │ │ │ │ ... │ │ │ │ │ :ref:`targets `/nr_targets │ │ │ │ │ │ :ref:`0 `/pid_target,obsolete_target │ │ │ │ │ │ │ :ref:`regions `/nr_regions @@ -97,7 +102,10 @@ comma (","). │ │ │ │ │ │ │ │ 0/id,weight │ │ │ │ │ │ │ :ref:`stats `/nr_tried,sz_tried,nr_applied,sz_applied,sz_ops_filter_passed,qt_exceeds,nr_snapshots,max_nr_snapshots │ │ │ │ │ │ │ :ref:`tried_regions `/total_bytes - │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age,sz_filter_passed + │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age,sz_filter_passed, + │ │ │ │ │ │ │ │ │ probes + │ │ │ │ │ │ │ │ │ │ 0/hits + │ │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... @@ -227,8 +235,8 @@ contexts//monitoring_attrs/ Files for specifying attributes of the monitoring including required quality and efficiency of the monitoring are in ``monitoring_attrs`` directory. -Specifically, two directories, ``intervals`` and ``nr_regions`` exist in this -directory. +Specifically, two directories, ``intervals``, ``nr_regions`` and ``probes`` +exist in this directory. Under ``intervals`` directory, three files for DAMON's sampling interval (``sample_us``), aggregation interval (``aggr_us``), and update interval @@ -262,6 +270,27 @@ tuning-applied current values of the two intervals can be read from the ``sample_us`` and ``aggr_us`` files after writing ``update_tuned_intervals`` to the ``state`` file. +.. _damon_usage_sysfs_probes: + +contexts//monitoring_attrs/probes/ +------------------------------------- + +A directory for registering :ref:`data attributes monitoring +` probes. + +In the beginning, this directory has only one file, ``nr_probes``. Writing a +number (``N``) to the file creates the number of child directories named ``0`` +to ``N-1``. Each directory represents each monitoring probe. + +In each probe directory, one directory, ``filters`` exist. The directory +contains files for installingt filters for the probe, that is used to determine +the data attribute for the probe. + +In the beginning, ``filters`` directory has only one file, ``nr_filters``. +Writing a number (``N``) to the file creates the number of child directories +named ``0`` to ``N-1``. Each directory represents each filter and work in a +way similar to that for :ref:`DAMOS filter `. + .. _sysfs_targets: contexts//targets/ @@ -614,10 +643,13 @@ set the ``access pattern`` as their interested pattern that they want to query. tried_regions// ------------------ -In each region directory, you will find five files (``start``, ``end``, -``nr_accesses``, ``age``, and ``sz_filter_passed``). Reading the files will -show the properties of the region that corresponding DAMON-based operation -scheme ``action`` has tried to be applied. +In each region directory, you will find six files (``start``, ``end``, +``nr_accesses``, ``age``, ``sz_filter_passed`` and ``probe_hits``). Reading +the files will show the properties of the region that corresponding DAMON-based +operation scheme ``action`` has tried to be applied. + +Reading ``probe_hists`` shows the number of data attributes monitoring +probe-hit positive samples of the region. Example ~~~~~~~ diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 6731c3102d0ff..887b45cbeb716 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -276,6 +276,8 @@ interval``, DAMON checks if the region's size and access frequency (``nr_accesses``) has significantly changed. If so, the counter is reset to zero. Otherwise, the counter is increased. +.. _damon_design_data_attrs_monitoring: + Data Attributes Monitoring ~~~~~~~~~~~~~~~~~~~~~~~~~~ -- 2.47.3