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[2603:7000:c01:2716:da5e:d3ff:fee7:26e7]) by smtp.gmail.com with ESMTPSA id vy13-20020a05620a490d00b0077da601f06csm775056qkn.10.2023.11.30.11.39.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Nov 2023 11:39:57 -0800 (PST) Date: Thu, 30 Nov 2023 14:39:56 -0500 From: Johannes Weiner To: Matthew Wilcox Cc: Shakeel Butt , Dan Schatzberg , Roman Gushchin , Yosry Ahmed , Huan Yang , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Muchun Song , Andrew Morton , David Hildenbrand , Huang Ying , Kefeng Wang , Peter Xu , "Vishal Moola (Oracle)" , Yue Zhao , Hugh Dickins Subject: Re: [PATCH 0/1] Add swappiness argument to memory.reclaim Message-ID: <20231130193956.GA543908@cmpxchg.org> References: <20231130153658.527556-1-schatzberg.dan@gmail.com> <20231130184424.7sbez2ukaylerhy6@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: F002440015 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: pq9s6ydj1zb1k4u8ygd4j741z33bg3xc X-HE-Tag: 1701373198-296298 X-HE-Meta: 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 Nva02Skd 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 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 Thu, Nov 30, 2023 at 06:54:37PM +0000, Matthew Wilcox wrote: > On Thu, Nov 30, 2023 at 06:44:24PM +0000, Shakeel Butt wrote: > > On Thu, Nov 30, 2023 at 07:36:53AM -0800, Dan Schatzberg wrote: > > > * Swapout should be limited to manage SSD write endurance. In near-OOM > > > > Is this about swapout to SSD only? > > If you're using spinning rust with its limit of, what, 200 seeks per > second, I'd suggest that swapout should also be limited but for > different reasons. We can set you up with a laptop with insufficient > RAM and a 5400rpm drive if you'd like to be convinced ... ^_^ Yeah, we don't enable disk swap on the hard drive hosts that are left. This aspect is only about write endurance management on SSD during proactive reclaim.