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Tue, 08 Feb 2022 00:43:07 -0800 (PST) Date: Tue, 8 Feb 2022 01:43:03 -0700 From: Yu Zhao To: Andrew Morton , Johannes Weiner , Mel Gorman , Michal Hocko Cc: 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 , Holger =?iso-8859-1?Q?Hoffst=E4tte?= , Konstantin Kharlamov , Shuang Zhai , Sofia Trinh Subject: Re: [PATCH v7 10/12] mm: multigenerational LRU: thrashing prevention Message-ID: References: <20220208081902.3550911-1-yuzhao@google.com> <20220208081902.3550911-11-yuzhao@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220208081902.3550911-11-yuzhao@google.com> Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=ohrEubPZ; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf04.hostedemail.com: domain of yuzhao@google.com designates 209.85.166.44 as permitted sender) smtp.mailfrom=yuzhao@google.com X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: D752640007 X-Stat-Signature: m4a7gcgpuuaietycr8nomyd7yc5wz8kk X-HE-Tag: 1644309788-667241 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, Feb 08, 2022 at 01:19:00AM -0700, Yu Zhao wrote: > Add /sys/kernel/mm/lru_gen/min_ttl_ms for thrashing prevention, as > requested by many desktop users [1]. > > When set to value N, it prevents the working set of N milliseconds > from getting evicted. The OOM killer is triggered if this working set > can't be kept in memory. Based on the average human detectable lag > (~100ms), N=1000 usually eliminates intolerable lags due to thrashing. > Larger values like N=3000 make lags less noticeable at the risk of > premature OOM kills. Refactored min_ttl into a separate patch as requested here: https://lore.kernel.org/linux-mm/YdxSUuDc3OC4pe+f@dhcp22.suse.cz/