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Howlett" , 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: [PATCH 18/19] Docs/admin-guide/mm/damon/usage: document weight sysfs file Date: Fri, 10 Jul 2026 06:46:47 -0700 Message-ID: <20260710134651.18084-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260710134651.18084-1-sj@kernel.org> References: <20260710134651.18084-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 9784C40007 X-Stat-Signature: egn3hb88irzgqjgfg6xo79d51a9tx6oe X-HE-Tag: 1783691227-816405 X-HE-Meta: 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 HTv0FrI9 iBWXGFYP2x+e+beCkQfQxuVhhPSqfFTCiR+QMgzhgrthyCIRJG64I++UZFEnMyapi8L8Tan9QKvas8dw8ciO6xhq70pDH55h0Iic1UHFL60lT7PJ3V1pWvGG5f1puCFcVTa6gHCMzyb6g4dleH2jXfpGU2DMkU0MsuIZWWhb4QVcRYWmcxR2/pCZ6a0qsgxGSrKbPNaM0Lx8Ks7BqXpA0SuymT25aJVBagBGFPd9+xF+DEHRWvt8rJBtlanpHSaxhnI1d6Ij1fN0NfZJymlSC1IdwCXCPUeZ+HaHdRZMjZMVxrbwZ+uCqxGnSwrkHaY/k/ferjAnF7XsS2Oy2hjUe1r+lrCm3t98T9MdVY4PkBy6MJwe5CDbyx1ix23HEQYaw1Ave6NEZfqk1qVg= 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