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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 17/19] Docs/mm/damon/design: document attrs-only monitoring Date: Thu, 9 Jul 2026 17:23:43 -0700 Message-ID: <20260710002349.111414-18-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-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: F0BA21C0002 X-Stat-Signature: 865i8xs57bjedxhwh79wspz3w16obsny X-HE-Tag: 1783643044-402999 X-HE-Meta: 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 9EBhHhDH XBOzgYui1p21/qdTbF2w0xkzP8TPpnHqEkVBLrxQAS4N7uQrrs+5/5DIZnA1SU619WrqnBEUS85kL9GLhCmEgD4ytfaE0txAB1NtWqgJUgWGJPqg0w9JXbOrzLKMy9XMHgiyoak3bPjK3nP6EmVC4aWy1U0SejRmkQwT+9nOpIdyQJ/oVHH+leqkicM4a7FEolyMO/F+60zzf5LmMHFey6kGRs7gZIVkB7IucsY5/2lJKM3DFNAGdQ4jzHHAOFH9oBxux3Xjceh79nLA= 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