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Fri, 18 Feb 2022 10:56:44 -0800 (PST) Date: Fri, 18 Feb 2022 10:56:44 -0800 (PST) From: David Rientjes To: Yu Zhao , Johannes Weiner , Shakeel Butt cc: Andrew Morton , Johannes Weiner , Mel Gorman , Michal Hocko , Andi Kleen , Aneesh Kumar , Barry Song <21cnbao@gmail.com>, Catalin Marinas , Dave Hansen , Hillf Danton , Jens Axboe , Jesse Barnes , Jonathan Corbet , Linus Torvalds , Matthew Wilcox , Michael Larabel , Mike Rapoport , Rik van Riel , Vlastimil Babka , Will Deacon , Ying Huang , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, page-reclaim@google.com, x86@kernel.org, Brian Geffon , Jan Alexander Steffens , Oleksandr Natalenko , Steven Barrett , Suleiman Souhlal , Daniel Byrne , Donald Carr , =?UTF-8?Q?Holger_Hoffst=C3=A4tte?= , Konstantin Kharlamov , Shuang Zhai , Sofia Trinh Subject: Re: [page-reclaim] [PATCH v7 11/12] mm: multigenerational LRU: debugfs interface In-Reply-To: <20220208081902.3550911-12-yuzhao@google.com> Message-ID: <5dcf93c7-7b75-507e-f896-d1bd8c7ceb37@google.com> References: <20220208081902.3550911-1-yuzhao@google.com> <20220208081902.3550911-12-yuzhao@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: B654712000B X-Stat-Signature: 87uhff4gk5kkpdfyru5wo8w99rniqfue Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=lFy1wh6F; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf29.hostedemail.com: domain of rientjes@google.com designates 209.85.210.171 as permitted sender) smtp.mailfrom=rientjes@google.com X-HE-Tag: 1645210606-188756 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: On Tue, 8 Feb 2022, Yu Zhao wrote: > Add /sys/kernel/debug/lru_gen for working set estimation and proactive > reclaim. These features are required to optimize job scheduling (bin > packing) in data centers [1][2]. > Johannes, do you believe this interface is sufficient to induce memcg based reclaim or do you have plans to propose a memory.reclaim extension to memcg? I assume that lru_gen could be used even if memcg is disabled whereas memory.reclaim would only be available on systems where the controller is mounted through cgroups. Yet a question would probably arise about the stability of this interface since it lives in debugfs: can we plan on /sys/kernel/debug/lru_gen being long-term supported?