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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 v1.1 14/16] Docs/mm/damon/design: document attrs-only monitoring Date: Mon, 6 Jul 2026 07:19:08 -0700 Message-ID: <20260706141912.88445-15-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260706141912.88445-1-sj@kernel.org> References: <20260706141912.88445-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 2FB73180002 X-Stat-Signature: k6us489irdorgqxoa8rbyyfuyanpcbt6 X-HE-Tag: 1783347566-850791 X-HE-Meta: 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 Mx6eYbiu 7do634+ocGDnSDCmWQ+/Fr3FYtHrU66BQvAMSWIqsorIBWJS+H28cGZ3q5SEcv4vlQbnrukQMkdlfD4NWvjqM3fxLH8IrKRL6P8Eq9L7sfa6NWSZN3bFfAe74XNp9qd2+9TMv5byO/xNCgj/jShCV+D3dGxSOjBdM69egzoyw/WQeSI+AnFi0OS+VSaRvZV1DSknSxHIcbayXXRjlQ1N+mzCVP75h8K+SSr641KgOzHAQeNb8T2+JrwrepZEPveHqtYnyrWwNKbwJDc0= 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