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Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 07/11] Docs/admin-guide/mm/damon/lru_sort: document filter_young_pages Date: Tue, 13 Jan 2026 07:27:12 -0800 Message-ID: <20260113152717.70459-8-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260113152717.70459-1-sj@kernel.org> References: <20260113152717.70459-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: ACCCCC000B X-Stat-Signature: ueuya5ayy4iepj8x1r9mhxw76dqt95y9 X-Rspam-User: X-HE-Tag: 1768318054-113309 X-HE-Meta: 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 WYUh8vkq 9Afn8EMcLih9Pzao+d/mq7tnvzOE1VoYnq1LOys1QF+/74CkfGtfGbMTpCJnJ1ieUYOeTOetyJbRXwpe8yLwnCrMfFrGbZU9YrYLCufrVZ9LmUYIYAkYOPRxZnexBHn7aEzwYcTIdwhAFwuX32sr/Om7VaOZH/AtA6JYokrMdwVgtER9k4KsIwJWFup2YVZATqARs/TOoEDpl8G4sM+vsxLx5/8goJ4NF8YxL8x1hJSplALraV8Dqmvo4WPFfKJ2QseJ80UuwK3pCGLqSJpbK/OD27g== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Document the new DAMON_LRU_SORT parameter, filter_young_pages. It can be used to use page level access re-check for the LRU sorting. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/lru_sort.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/Documentation/admin-guide/mm/damon/lru_sort.rst b/Documentation/admin-guide/mm/damon/lru_sort.rst index 72a943202676..bb222a32aefd 100644 --- a/Documentation/admin-guide/mm/damon/lru_sort.rst +++ b/Documentation/admin-guide/mm/damon/lru_sort.rst @@ -79,6 +79,20 @@ of parametrs except ``enabled`` again. Once the re-reading is done, this parameter is set as ``N``. If invalid parameters are found while the re-reading, DAMON_LRU_SORT will be disabled. +filter_young_pages +------------------ + +Filter [non-]young pages accordingly for LRU [de]prioritizations. + +If this is set, check page level access (youngness) once again before each +LRU [de]prioritization operation. LRU prioritization operation is skipped +if the page has not accessed since the last check (not young). LRU +deprioritization operation is skipped if the page has accessed since the +last check (young). The feature is enabled or disabled if this parameter is +set as ``Y`` or ``N``, respectively. + +Disabled by default. + hot_thres_access_freq --------------------- -- 2.47.3