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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 17/19] Docs/mm/damon/design: document attrs-only monitoring Date: Fri, 10 Jul 2026 06:46:46 -0700 Message-ID: <20260710134651.18084-18-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-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 8ECC61C0002 X-Stat-Signature: 85arwdje886owoodue6opfmmkktibwde X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1783691226-838520 X-HE-Meta: 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 ctHly042 EptDR6TOcutdpO7A3Ney4nrw5g8KHng2TEdC2HoLbm420xo22j+0/iGjMtsl3oa2tYoSXd8mMm6o5d2WD4Fop6cAb5vN8rxn3YjlViUXzqDu3+BwdRFqZBUIJbbnWihNaypyajAO91coeriDVR9vLno3WMaYLZDLlvUCxFPNFssokeTfkcYi/m2sMurTIS3KZUqDHkGZVGjdduM3kCThytfbUo4Xl2aC02CB3Dxuc0YdEJ1fumRkXozNajXTFW2NkMmipFARLb0wKp8VkGjux5eUNeZv76mJtpgC7lo4vrzWzWsdo+VS6O9pGJPEAcypNcVhFAIpNgneaYLHlKWILIipTV0YnYhdTFJTYjUZ2DRvl+8U= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Update DAMON design document for the attributes only monitoring mode. Signed-off-by: SJ Park --- Documentation/mm/damon/design.rst | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 457d6e8bc7878..6d79e7d69be84 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -316,6 +316,26 @@ 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. +Data Attributes-only Monitoring +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Data access is the primary monitoring information for DAMON. Hence it +:ref:`adjusts ` regions using the access +:ref:`counter ` (``nr_accesses``). In some +use cases, however, users may want some of :ref:`attributes +` to be the primary information. + +Data attributes-only monitoring mode supports this use case. For the mode, +each attribute probe has their priority weight value. Users can describe by +what combination of the attributes the primary information is decided, by +setting the priority weight value. If the total sum of the weights is not +zero, the mode is enabled. The regions adjustment mechanism uses the weighted +sum of the :ref:`probe hit counts ` instead +of ``nr_accesses`` in the case. When the mode is enabled, access monitoring is +automatically turned off. The access counter (``nr_accesses``) will always be +zero and not updated. Hence the mode is called Data Attributes "only" +monitoring. + Dynamic Target Space Updates Handling ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- 2.47.3