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Thu, 30 Nov 2023 11:50:56 -0800 (PST) Date: Thu, 30 Nov 2023 14:50:54 -0500 From: Dan Schatzberg To: Shakeel Butt Cc: Johannes Weiner , 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 , Matthew Wilcox , 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: 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: <20231130184424.7sbez2ukaylerhy6@google.com> X-Rspamd-Queue-Id: C7DA0C001F X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: jxf5aqj948pc9g8j4yrmfztch351yx8w X-HE-Tag: 1701373857-546579 X-HE-Meta: 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 zSlqy7Mr 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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 06:44:24PM +0000, Shakeel Butt wrote: > [...] > > * Swapout should be limited to manage SSD write endurance. In near-OOM > > Is this about swapout to SSD only? Correct > > situations we are fine with lots of swap-out to avoid OOMs. As these are > > typically rare events, they have relatively little impact on write endurance. > > However, proactive reclaim runs continuously and so its impact on SSD write > > endurance is more significant. Therefore it is desireable to control swap-out > > for proactive reclaim separately from reactive reclaim > > This is understandable but swapout to zswap should be fine, right? > (Sorry I am not following the discussion on zswap patches from Nhat. Is > the answer there?) You're correct here as well - we're not concerned about swapout to zswap as that does not impact SSD write endurance. This is not related to Nhat's patches.