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charset=us-ascii Content-Disposition: inline In-Reply-To: <20231108065818.19932-1-link@vivo.com> X-Stat-Signature: wms551aho5ebzzx6wcbeymfxkytegr8w X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: EF1B6A0006 X-Rspam-User: X-HE-Tag: 1699452411-284224 X-HE-Meta: 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 pqF8Ml/j LfrO3pwEKpcCpl9kkBb7IK/p7LGJfAI3AUQblEFnYut+ooi/RkfTXtfj0+gvRGriskeARuq3becAXSr9ygwHXq2F3o+OrDQECdBHBrldO9K+XjRwnDuwFf10ZKgtk6Lb5GUsuoyY/SHPPr+qNE28d7DHdB3/yDQtJ2pYOh1nTKngEPRpf9cvDKyIsE58NvFG7qeUgLW4aYnj7fk/9ohZ5zj3Gagjf02p4LQO+5cMK2b8n0GWaWEZ6RYrYyh5o/QPIk+hz 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: On Wed 08-11-23 14:58:11, Huan Yang wrote: > 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. Could you explain why? And also why do you need to swap out in that case? > 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. Other have already touched on this in other replies but v2 doesn't have a per-memcg swappiness > 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. In general this is a bad semantic. The operation shouldn't have side effect that are potentially visible for another operation. -- Michal Hocko SUSE Labs