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b=UPcb9mrv7i37FYMvmlJE5STml8AaOU2toSGgMMJ19HfDV+qNDmEpZSEpUAX4uyzog CdcTsJIyF/F/98d6Q8SK4j+nVaq82sXIiWSBolZS0GCScKsH0UfjKAUvSBABQgYT2O yIP9xxhZVQG4t2mZB1lSWtGYnlcszN2FUGKMij1CWKUQTdw2gFM0oT1Kq2VdCseMkN I5t+gdAdMuyMjRyTz6ldO+Qyiov9XtGXxKbdbZCE/toQvBD0h1/5JM+XXdr0vw88Dh fLCqLhMEpz5QAtUl4D8QLfzjbf9qDA4voETEK1o4lo7QemrRFUcmx8pKXfIS7Ah25M JuGLwBp0T00fg== Message-ID: <88e636fe-3c29-4d8b-a752-d8b31c8181a2@kernel.org> Date: Tue, 4 Aug 2026 17:36:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/3] mm/vmscan: add pgrotate_anon and pgrotate_file vmstat counters Content-Language: en-US To: Usama Arif , Andrew Morton , david@kernel.org, ljs@kernel.org, liam@infradead.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, chrisl@kernel.org, nphamcs@gmail.com, baoquan.he@linux.dev, youngjun.park@lge.com, hannes@cmpxchg.org, roman.gushchin@linux.dev, muchun.song@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, rientjes@google.com, kernel-team@meta.com References: <20260727162550.2032-1-usama.arif@linux.dev> <20260727162550.2032-3-usama.arif@linux.dev> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: j4wobkotbnfx1efooedt587xt1bc8ost X-Rspamd-Queue-Id: 3D8C01C000C X-HE-Tag: 1785857771-992326 X-HE-Meta: U2FsdGVkX19EWJWqKZqxkhggiNyXd7U/KjYUymZ8eeq1aeg16eu6enXV7Sju2tYNGiJkDcvtxyHdtpHor+UFoZ6oogKtwLdTmt2dKUNCmMsCI9pZPhFXmCt0efsgeD0Op9HqTwqLJShvlon/C3gGSk7r1zslLpFj9bB/3U+e7MJ8Xj5rTcLQyRadY+neEcIjFaFgDVDO7wKXHDyWFtD/VT41HzHMsMFqhnr4jBhUtYdPpCNpioMgq1CxDx+TatF2WNEm9fX7usn+eVWHsFfvfGNh36K1QRKemk4DQQ4lEipYQfrmxqnNAtFYDLbT7FBAg+eR3iSWf7+QMV2oBCQ+G1zAkefu97fOv/svBEfP7ALcPh5/wx6LTu3fvFIdWGeGYvGsmyFQEjmo9ft+EHC5Y3lvLmjUYjuJJ5NZkBLEw4Fov4Y5DznaRHIC9A+TYyYp3jsbCgthA0YmlipHuyzdtZBihnBU2AQNJEjfYWQRnbr5i2LgwOA/OQAFAUXVwtZwPA92BNsE8bOKNq+y+38DLJxoR9iOYSjAgq8xDk9TNc8aPqr2XaeblBiNh7PSoTZjwQGZaoXxUFXa3C+zZpDmt+NsNNr5awnW3BnCF8kJC5dmw24ybhEKEOI+9kDF79yeEAMSDd0/fxPkwGjUseYe0dOHasY4uvievydu2SWU6puOb7GVIDqjdiGUn81ePQVPhkI94BxwUxJNLC8/Qfe5S1GHDaLzUsKe+O60WkGGl0FL/ODpbXn/m60+krIlbcr8WLvQ94Vi1nseafSUfZp8AEtqLuF0f4ObzuxaMLFgBqBJ0LaGJaQZbDPB1OgdEKlyHM6IJG5N1uUEOMMG+olCpdraXC/E/7PshFaCBbp7uPtgaBpiXSofZfDetE5vupfhqxIXsZmzB+UD2VzxEU6xwCFIyr9QyKAaoKaGzoydDBFK6Jd/6eqqXhNfAzO+JRM2TnvQ0qXULiLYBoEvwKf 9kamCue3 JeiUbF4vqRIdjY2AF028ABsUIFWYFTi7YtMor9bGiUW4iplbe6L1yOmuKHdPHbDXH5dW5rX6GxuQM2QbdJfSCjjIR4kNeEDYukRMlthO9l//V0uufSp51R9QFvFDnvegqJKcS/jI14DA6Tmgf3jzfGLTxznciC0k8q1XvLzVLolQPKaZOW3nUG6CWO6fp26hQtnMm5eRnnuUwCUefeLR2xNBxksIgj+Uok1sdA1cWzuAyPQz2JNWKM2vdRebIjpjjPkrL+rk34WmRRtFtdJiHm5vhn59xKVA4zlO500U6SYW9704TQ9GA8cfHKCTcZ718CTL5z9ZGor+aFfI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/27/26 18:23, Usama Arif wrote: > Reclaim can spend substantial work on an LRU type without immediately > reclaiming or demoting a corresponding amount of memory. Record this > work in PGROTATE_ANON and PGROTATE_FILE. > > For classic LRU reclaim: > > - Inactive-list reclaim adds nr_scanned - nr_reclaimed to the > corresponding anon/file counter when isolation succeeds. > - Active-list reclaim adds referenced executable file folios that > are retained on the active list to PGROTATE_FILE. Active anon > reclaim does not contribute this component. > > For MGLRU, add the number of initially isolated pages that remain > unreclaimed after both the initial and retry passes to the counter for > the selected anon/file type. > > These counters are distinct from the existing pgrotated vm event. > pgrotated records an actual move to the inactive-list tail, primarily > after reclaim-marked writeback completes or failed invalidation leaves > a folio for accelerated reclaim. PGROTATE_ANON and PGROTATE_FILE > measure reclaim cost and do not imply that a folio moved to an LRU tail. > > A subsequent patch will consume these counters for anon/file scan > balancing. > > Signed-off-by: Usama Arif Reviewed-by: Vlastimil Babka (SUSE)