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[209.85.221.49]) by smtp.gmail.com with ESMTPSA id kx19sm3008852ejc.112.2022.01.10.17.42.25 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Jan 2022 17:42:25 -0800 (PST) Received: by mail-wr1-f49.google.com with SMTP id k30so12569464wrd.9 for ; Mon, 10 Jan 2022 17:42:25 -0800 (PST) X-Received: by 2002:adf:c74e:: with SMTP id b14mr1780419wrh.97.1641865334895; Mon, 10 Jan 2022 17:42:14 -0800 (PST) MIME-Version: 1.0 References: <20220104202227.2903605-1-yuzhao@google.com> In-Reply-To: From: Linus Torvalds Date: Mon, 10 Jan 2022 17:41:58 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v6 0/9] Multigenerational LRU Framework To: Jesse Barnes Cc: Yu Zhao , Michal Hocko , Andrew Morton , Andi Kleen , Catalin Marinas , Dave Hansen , Hillf Danton , Jens Axboe , Johannes Weiner , Jonathan Corbet , Matthew Wilcox , Mel Gorman , Michael Larabel , Rik van Riel , Vlastimil Babka , Will Deacon , Ying Huang , Linux ARM , "open list:DOCUMENTATION" , Linux Kernel Mailing List , Linux-MM , page-reclaim@google.com, X86 ML Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 361C340007 X-Stat-Signature: n1qrj36sk3whb7hncwpkqx93onbtacqy Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=Oq2UN+3x; spf=pass (imf01.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.208.46 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org; dmarc=none X-HE-Tag: 1641865347-845378 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 Mon, Jan 10, 2022 at 2:46 PM Jesse Barnes wrote: > > So unless we want to eschew big mm changes entirely (we shouldn't! > look at net or scheduling for how important big rewrites are to > progress), I think we should be open to experimenting with new stuff. So I personally think this is worth going with, partly simply due to the reported improvements that have been measured. But also to a large extent because the whole notion of doing multi-generational LRU isn't exactly some wackadoodle crazy thing. We already do active vs inactive, the whole multi-generational thing just doesn't seem to be so "far out". But yes, numbers talk, and I get the feeling that we just need to try it. Maybe not 5.17, but.. Linus