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Introduce unbalance proactive reclaim To: Yosry Ahmed Cc: "Huang, Ying" , Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , David Hildenbrand , Matthew Wilcox , Kefeng Wang , Peter Xu , "Vishal Moola (Oracle)" , 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> <87v8ack889.fsf@yhuang6-desk2.ccr.corp.intel.com> <87r0l0k6o6.fsf@yhuang6-desk2.ccr.corp.intel.com> <4db7e55f-c6cb-4be2-89e1-339f6e32b85b@vivo.com> From: Huan Yang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR04CA0186.apcprd04.prod.outlook.com (2603:1096:4:14::24) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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 0Py7tHLy 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写道: >>>>>> Huan Yang writes: >>>>>> >>>>>>> In some cases, we need to selectively reclaim file pages or anonymous >>>>>>> pages in an unbalanced manner. >>>>>>> >>>>>>> For example, when an application is pushed to the background and frozen, >>>>>>> it may not be opened for a long time, and we can safely reclaim the >>>>>>> application's anonymous pages, but we do not want to touch the file pages. >>>>>>> >>>>>>> This patchset extends the proactive reclaim interface to achieve >>>>>>> unbalanced reclamation. Users can control the reclamation tendency by >>>>>>> inputting swappiness under the original interface. Specifically, users >>>>>>> can input special values to extremely reclaim specific pages. >>>>>> From mem_cgroup_swappiness(), cgroupv2 doesn't have per-cgroup >>>>>> swappiness. So you need to add that firstly? >>>>> Sorry for this mistake, we always work on cgroupv1, so, not notice >>>>> this commit 4550c4e, thank your for point that. >>>>> >>>>> I see this commit comment that `that's a different discussion`, but, >>>>> to implements this, I will try add. >>>>> >>>>>>> Example: >>>>>>> echo "1G" 200 > memory.reclaim (only reclaim anon) >>>>>>> echo "1G" 0 > memory.reclaim (only reclaim file) >>>>>>> echo "1G" 1 > memory.reclaim (only reclaim file) >>>>>>> >>>>>>> Note that when performing unbalanced reclamation, the cgroup swappiness >>>>>>> will be temporarily adjusted dynamically to the input value. Therefore, >>>>>>> if the cgroup swappiness is further modified during runtime, there may >>>>>>> be some errors. >>>>>> If cgroup swappiness will be adjusted temporarily, why not just change >>>>>> it via a script before/after proactive reclaiming? >>>>> IMO, this unbalance reclaim only takes effect for a single command, >>>>> so if it is pre-set using a script, the judgment of the reclamation tendency >>>>> may become complicated. >>>> If swappiness == 0, then we will only reclaim file pages. If swappiness >>>> == 200, then we may still reclaim file pages. So you need a way to >>>> reclaim only anon pages? >>>> >>>> If so, can we use some special swappiness value to specify that? I >>>> don't know whether use 200 will cause regression. If so, we may need >>>> some other value, e.g. >= 65536. >>> I don't think swappiness is the answer here. This has been discussed a >>> while back, please see my response. As you mentioned, swappiness may >>> be ignored by the kernel in some cases, and its behavior has >>> historically changed before. >> For type base, reclaim can have direct tendencies as well. It's good. >> But, what if >> we only want to make small adjustments to the reclamation ratio? >> Of course, sometimes swappiness may become ineffective. >> > Is there a real use case for this? I think it's difficult to reason > about swappiness and make small adjustments to the file/anon ratio > based on it. I'd prefer a more concrete implementation. For example, swappiness=170 to try hard reclaim anon, a little pressure to reclaim file(expect reclaim clean file). In theory, this method can help reduce memory pressure. Or else, reclaim 80% anon and trim 5% code file control is good when it is detected that an application has been frozen for a period of time.