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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 v2.2 21/28] Docs/admin-guide/mm/damon/usage: document data attributes monitoring Date: Thu, 14 May 2026 17:44:22 -0700 Message-ID: <20260515004433.128933-22-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260515004433.128933-1-sj@kernel.org> References: <20260515004433.128933-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 90ADD20007 X-Stat-Signature: eniyrpcnoz13u8mk6zodi14qaw6nn9ig X-Rspam-User: X-HE-Tag: 1778805896-730099 X-HE-Meta: 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 5QHAV/Yy pKE23YrKlaoY3pI6Bb2BE5845Vj2PPCO8Af763mo5LzhcxhZ066ttz86LVuoZV1wQ4ncm8mgKdTgpWlBSpUDldRibXrsHKegd1Ei5Z8OJICpBcXqrNqNz3EBg2pQtyzoOplHCZhFmrJ8JYbS2MtBTsPpPTjIkAmHmV/VaSM9yDJSplp1iUUhWilAbC0x+HFnzU8+Q4BZ0wlAHPegvOn+84yyNy6CK0f1C+zqS0n1+PiczHSZRM8GkfkRDUteyCb8y/PYjze1obPaxvyfBCAQnxzAvEqTKMwHoGr5qFFAq6gzum4gCSlb6j2bK/w== 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 534e1199cf091..44224da62533e 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 @@ -94,7 +99,10 @@ 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 + │ │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... @@ -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, 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 @@ -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`` 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/ @@ -600,10 +629,13 @@ 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 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