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Introduce unbalance proactive reclaim To: Michal Hocko Cc: "Huang, Ying" , Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , David Hildenbrand , Matthew Wilcox , Kefeng Wang , Peter Xu , "Vishal Moola (Oracle)" , Yosry Ahmed , Liu Shixin , Hugh Dickins , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, opensource.kernel@vivo.com References: <20231108065818.19932-1-link@vivo.com> <87msvniplj.fsf@yhuang6-desk2.ccr.corp.intel.com> <1e699ff2-0841-490b-a8e7-bb87170d5604@vivo.com> From: Huan Yang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR04CA0187.apcprd04.prod.outlook.com (2603:1096:4:14::25) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|SEYPR06MB5964:EE_ 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U2FsdGVkX19KGl6uieo+BK0m32wuu9x588cGROaD7Ss2EVR773pjvpFeoYU9snQYhf1oQ33AysF2sUuKwAc95KskmEh+07VcBoAd9Ic0iqP1rmJ0GTv4Mob/cmvBdy8QKGnOZNDPA0/Y9KzsnUQWinpp1klWH0NGYzM1u0X9+WYQg7U83yeJCWgI6AtMI0VWtR9BjuHoDIq5ymkqQlUI7pxA16OuSBk7evjOJAt4T/5t4nunqF3DTUjzux50VgvwzPAAvqRzJqW6VQyKeNMezdJGMfjUEar29G8iBg5X+rRnV4N6a0VnmyY3Sh6GTA3pdyyQ5Gl3fAabM/gxyE7K9VTtLnHE33cD5nxc32Z35y+NxaJv/5ouApgB1tawBeN7mrdXuxWJcTmvqqD7GtIm/pjaGyDBL8H5gK0C49ekULfOZoUmZh5KKYgiBPyrQRD04dt4rT9qEsXYnM0wInWD7vO92c7ws1SJiIJDnBhkuNd+1vZbO84X7dzgytcIuZCvOa/n/tPjFRB/6fA0ZoEiR9daIEICacLMmWGJX3FBZLv26AD8QxfneawWuk6lobh1vbbdH/K69J+UqF3URNW/Vx7Jksrp59S5V1C4bcKx1kCgtcgqfvMPjvz+J67UdZI7IKS8ztNt2SXdRPlziL3D/v4BlyDSSQdiEzY+Y45HzYKCL/3JZa6cmOyS9LneCJsYGv/BXRqeaKdRZZsljB6m7kzLX3sXtz4TARDIZJCX4+YLXzyPxA3ALc3fXvGgVDasZ6h9d6iTEhWmko00vnMeVoB6PWFBsebsALaUxsuBbv8uBlcOu4anYGhkUJ0RQ67W8aKV1WRl9urUk0O80ALk2lG2kG4LBaYsFCItPveyvVcgI2ueE3zO5WNmlgOFWqLA4Xk6LcKOMcI+92GNExwgT+Y0y28u8ozW1i1d88zoGTIH6qMhsApeG7/26cbyOWFBhLSsdQbWjwnumX4cXRX 80MkCGnZ 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Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > On Thu 09-11-23 11:38:56, Huan Yang wrote: > [...] >>> If so, is it better only to reclaim private anonymous pages explicitly? >> Yes, in practice, we only proactively compress anonymous pages and do not >> want to touch file pages. > If that is the case and this is mostly application centric (which you > seem to be suggesting) then why don't you use madvise(MADV_PAGEOUT) > instead. Madvise  may not be applicable in this scenario.(IMO) This feature is aimed at a core goal, which is to compress the anonymous pages of frozen applications. How to detect that an application is frozen and determine which pages can be safely reclaimed is the responsibility of the policy part. Setting madvise for an application is an active behavior, while the above policy is a passive approach.(If I misunderstood, please let me know if there is a better way to set madvise.) > -- > Michal Hocko > SUSE Labs -- Thanks, Huan Yang