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b=iuFC1uPE6yHdgvmtAq5fTuU4Y4McB8SCdbjn4D52fgqleSfvTqkKb+9PfW3bP3Yp5 UAwWm1sCpsERsiA1fne3s7/jcMIfG91LSFLkXDwu6jGslOtGR+q4aOmgiD0NVFGYAP IhX/YFvVbyISYJqhImXCu7EOjWV2tIYGofzh0N0DGk2dpjXo1dnqrrQ/QDcOwLUJwQ cO43zD3rOdTZ3Cs8wFky36R6V3yLbj84+w4RwlfEBgQLrErlI47KvLnaXhFJ0dNlET CIKUhmaGYtiOMWkxVfk2jBH9rYVopwETnMUTXEcZla/jVoWP0Mo0Od1T9lns6Skx3y mqzzkb7NKfrxw== From: SeongJae Park To: Nhat Pham Cc: SeongJae Park , akpm@linux-foundation.org, corbet@lwn.net, linux-mm@kvack.org, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, damon@lists.linux.dev Subject: Re: [PATCH 0/2] mm/damon: introduce DAMOS filter type for active pages Date: Tue, 18 Mar 2025 11:51:56 -0700 Message-Id: <20250318185156.35448-1-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250318183029.2062917-1-nphamcs@gmail.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 42E6180010 X-Stat-Signature: czs865z7r4sz11x5c8hk78he4my3dwrk X-Rspamd-Server: rspam06 X-HE-Tag: 1742323920-204021 X-HE-Meta: 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 chEYL4b7 c2pbVOO7oXgonBMEk2wvsqy82MQ1alxDvAkzrf95qAwgkqb8S3iwX19Cf6Rk3NZvMDb77NhCtjkmj5elor7ywh7eHHkStb9ogF9sA2RXh4NI8NRoEfgI0KPVwqIpizwNbNAECIt+GKihlRYHIHG//yjzXL2vIJ7oviIUmStnRqZTTNhqlv/yDx4o9JpJlzLWQvy2huNm2DEQEnQuJnAMBMq3MuQ1ggRlJhTAt6cu9FR0btnY= 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: Hi Nhat, On Tue, 18 Mar 2025 11:30:27 -0700 Nhat Pham wrote: > The memory reclaim algorithm categorizes pages into active and inactive > lists, separately for file and anon pages. The system's performance > relies heavily on the (relative and absolute) accuracy of this > categorization. > > This patch series add a new DAMOS filter for pages' activeness, giving > us visibility into the access frequency of the pages on each list. This > insight can help us diagnose issues with the active-inactive balancing > dynamics, and make decisions to optimize reclaim efficiency and memory > utilization. > > For instance, we might decide to enable DAMON_LRU_SORT, if we find that > there are pages on the active list that are infrequently accessed, or > less frequently accessed than pages on the inactive list. I agree to all the points, and thank you very much for this great patch series. For other readers' information, DAMOS filters are for visibility of not only the human users, but also DAMOS itself. This new filter type will also be very useful at making DAMOS schemes that respects LRU information (e.g., reclaim DAMON-found cold pages but only if it is on inactive LRU list). Thanks, SJ [...]