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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 v1.3 18/19] Docs/admin-guide/mm/damon/usage: document weight sysfs file Date: Thu, 9 Jul 2026 17:23:44 -0700 Message-ID: <20260710002349.111414-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260710002349.111414-1-sj@kernel.org> References: <20260710002349.111414-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: F3DA04000C X-Stat-Signature: 53sdkfgc8qkgo4o5m8mrnuodnss6ybbq X-HE-Tag: 1783643045-971828 X-HE-Meta: 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 5rcHnxrd HdilsMENebtjdug3A0KFMps2A99ipjp1/K4DL82qBMlgK4yp2QP7Dyv8eog0gPxRulHoAitWMlRNUmywY4MDkI/FEiNS0li1Hf4oZAm/CGH/GvnhAnH3+XrVDjV0zRnYi1LQ7RXBS0BUTikEvu0rGlVRDkTup52YPr/2MvtU0v1k9AT5p74CSBz+j6A3hVvPqaw7Yu6B3eCuh0GjIM1aM/fT5OVO6rfGftfnZ+wJ0VU9If9Mz9CBPAVg90bR6bwcf8clzLXS/PPdBu+bo+5xwVCQhdr2XnoqHFdIWqci7E0BvBGR1rm1aHG6j5A== 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 newly added probe weight file. Signed-off-by: SJ Park --- Documentation/admin-guide/mm/damon/usage.rst | 11 ++++++++--- Documentation/mm/damon/design.rst | 5 +++++ 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index b2649ea011f93..da5f9afd08aef 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -73,9 +73,10 @@ comma (","). │ │ │ │ │ │ │ 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,path - │ │ │ │ │ │ │ │ ... + │ │ │ │ │ │ │ 0/weight + │ │ │ │ │ │ │ │ filters/nr_filters + │ │ │ │ │ │ │ │ │ 0/type,matching,allow,path + │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ ... │ │ │ │ │ :ref:`targets `/nr_targets │ │ │ │ │ │ :ref:`0 `/pid_target,obsolete_target @@ -286,6 +287,10 @@ 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. +Each probe directory also contains ``weight`` file. Reading from and writing +to the file gets and sets the :ref:`attributes-only monitoring +` weight for the attribute of 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 diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 6d79e7d69be84..aed6cb1cf4831 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -316,6 +316,8 @@ Another way to do this for higher accuracy is using :ref:`DAMOS filter information in page level. But, because it is operated in page level, the overhead is proportional to the size of the memory. +.. _damon_design_attrs_only_monitoring: + Data Attributes-only Monitoring ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -336,6 +338,9 @@ automatically turned off. The access counter (``nr_accesses``) will always be zero and not updated. Hence the mode is called Data Attributes "only" monitoring. +Refer to the :ref:`admin guide ` to know how users +can use the mode. + Dynamic Target Space Updates Handling ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- 2.47.3