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Introduce unbalance proactive reclaim To: Yosry Ahmed , Wei Xu , David Rientjes Cc: Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , David Hildenbrand , Matthew Wilcox , Huang Ying , 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> From: Huan Yang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR04CA0181.apcprd04.prod.outlook.com (2603:1096:4:14::19) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|KL1PR06MB6672:EE_ X-MS-Office365-Filtering-Correlation-Id: 7d1b456e-fec5-4f17-9cbf-08dbe0346388 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 PS44yfev 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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. > I proposed this a while back: > > https://lore.kernel.org/linux-mm/CAJD7tkbDpyoODveCsnaqBBMZEkDvshXJmNdbk51yKSNgD7aGdg@mail.gmail.com/ Well to know this, proactive reclaim single type is usefull in our production too. > > The takeaway from the discussion was that swappiness is not the right > way to do this. We can add separate arguments to specify types of > memory to reclaim, as Roman suggested in that thread. I had some > patches lying around to do that at some point, I can dig them up if > that's helpful, but they are probably based on a very old kernel now, > and before MGLRU landed. IIRC it wasn't very difficult, I think I > added anon/file/shrinkers bits to struct scan_control and then plumbed > them through to memory.reclaim. > >> 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) > The type of interface here is nested-keyed, so if we add arguments > they need to be in key=value format. Example: > > echo 1G swappiness=200 > memory.reclaim Yes, this is better. > > As I mentioned above though, I don't think swappiness is the right way > of doing this. Also, without swappiness, I don't think there's a v1 vs > v2 dilemma here. memory.reclaim can work as-is in cgroup v1, it just > needs to be exposed there. Cgroupv1 can't use memory.reclaim, so, how to exposed it? Reclaim this by pass memcg's ID?