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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 v3 21/28] Docs/admin-guide/mm/damon/usage: document data attributes monitoring Date: Sat, 16 May 2026 11:37:02 -0700 Message-ID: <20260516183712.81393-22-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260516183712.81393-1-sj@kernel.org> References: <20260516183712.81393-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: D71A380002 X-Stat-Signature: hcbbrcz8bebguopoocaxd44w8gmrbii9 X-Rspam-User: X-HE-Tag: 1778956653-183041 X-HE-Meta: U2FsdGVkX1/DUkoQsBsmXT7R14/ZdWL99TQ8KCsb8Fl/jyt5n59e1gyB5Qf7WKgLiFA2m8IOLTzTCTefNXvuUxfDqtcdVtI7mVB5K5kebmj4uvxaT8KYsBcvQsU6C6gy+GoJBsHNVeOubus9huM4l6+Y8/i44pGHRrwVOB12ots5DyXHUwiDmaAE9d9ablfV2K1CPnWAR/Ohgv8uMmDhyL5lADV/WchuyTs8H/WYl1GxpV58uveep0kkTDwWTYRLWw6w3cWBwDmAkRDO5MMjxmcxZU5B63+asfvxndCaL5dASY+SISeJAHJcqR/zrQwp+uTAGrQQs3Gnt+6mWn0amjdOworsIJZcvXnDmf0x1UvOVAgQa/S1KmNtbVsn5/5TBQwY/XJdfOp+1/Qsy+46S7JA+LJMIBamY2LrMD+YDd0u6j3dvQ1nuuprg/AzlyGccVuErFij9TM05veo4IY9aI11E+HubKoEgDGd9e0Isn0JURSTI/uuAS8W/D8gFvO0BgD8Z66py1FRjr4DM5LB4WTNFGsFJ0dGNxdYYYqQz4Ps+wyiHG9Ov3mlWzTAp4u1BR8b9eYMVfp0y2fXLGR5nuG0YU7QBqeVuTU+M55YU+hGaiqO5gge7jVKklLNMZBPRIP+YmIGiak40a/KQwL7tTzOUKSSl7LB5PAg3lwhfqJIh1tgMBDPws72/iOwZHrgo+3bCoeKiGyE9RFAgHeEK8WSE2DJCbiL2xA/d0eQBTJKmbpImG/ymYEavD4CtUPo+5UjBrB1ajrZFMUicv9a/C2yjRwx2oJdkhE6LF0bxq34wbwxFGATDTpDEnLNg+qtxqnhA5ztdXOL9FETf4kG4O/SOU75l6byaiR2mA4PtAch7aGbTpnB4X0SrSbF/9XoPFEjUIsnB22FQ5BNXCDwvuyBvx6N56QC2MOTmAEwROIgEafmFw5kIAZfQvqwl7J9U2ePA+o/JsHeWG0X8Yu CFH5IQ6D mYAGjdP52zDSjcBJw1ZnFmUnRyzHFEQvbbeXM/5FYnnKyXE/x4UFe/60gz9/cH0PjB5ViFMA1vKGU/thU4VNe9blNFNlvH3xJrXahOoVPBYVrWeLjJYzcdP6ntTciVSaJUL49EFBjLPMns1ZYo1zJ8ndtg1tGoFnOqDleMPPmadcDz8N5uYS+LWagnrMGT3mJEHkumEotm6gVurSPYAajNphwzHOsPiK5Y9L31/kvbVK1+x0ep1pOcbh9keQKffpszw/4PuYeQvAJhM0SSUOOwoUSaDFW46rphstDTkhUbiHJyq9aQrCw2kyykA== 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 | 44 ++++++++++++++++++-- Documentation/mm/damon/design.rst | 2 + 2 files changed, 43 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index 534e1199cf091..7b6074a1666f3 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -71,6 +71,11 @@ 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 @@ -95,6 +100,9 @@ comma (","). │ │ │ │ │ │ │ :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 + │ │ │ │ │ │ │ │ │ probes + │ │ │ │ │ │ │ │ │ │ 0/hits + │ │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... @@ -221,8 +229,8 @@ 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, three 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 @@ -256,6 +264,27 @@ 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`` exists. The directory +contains files for installing 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 works in a +way similar to that for :ref:`DAMOS filter `. + .. _sysfs_targets: contexts//targets/ @@ -601,10 +630,19 @@ tried_regions// ------------------ In each region directory, you will find five files (``start``, ``end``, -``nr_accesses``, ``age``, and ``sz_filter_passed``). Reading the files will +``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. +tried_regions//probes/ +------------------------- + +In each region directory, one directory (``probes``) also exists. In the +directory, subdirectories named ``0`` to ``N-1`` exists. ``N`` is the number +of installed probes. In each number-named directory, a file (``hits``) exist. +Reading the file 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 aa08c899a3e5b..85d668e929194 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -269,6 +269,8 @@ 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