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[142.162.113.129]) by smtp.gmail.com with ESMTPSA id s2sm6142705qtw.22.2021.11.23.06.07.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Nov 2021 06:07:10 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1mpWRx-000B12-PB; Tue, 23 Nov 2021 10:07:09 -0400 Date: Tue, 23 Nov 2021 10:07:09 -0400 From: Jason Gunthorpe To: David Hildenbrand Cc: Jens Axboe , Andrew Dona-Couch , Andrew Morton , Drew DeVault , Ammar Faizi , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, io_uring Mailing List , Pavel Begunkov , linux-mm@kvack.org Subject: Re: [PATCH] Increase default MLOCK_LIMIT to 8 MiB Message-ID: <20211123140709.GB5112@ziepe.ca> References: <20211116114727.601021d0763be1f1efe2a6f9@linux-foundation.org> <20211116133750.0f625f73a1e4843daf13b8f7@linux-foundation.org> <8f219a64-a39f-45f0-a7ad-708a33888a3b@www.fastmail.com> <333cb52b-5b02-648e-af7a-090e23261801@redhat.com> <5f998bb7-7b5d-9253-2337-b1d9ea59c796@redhat.com> <20211123132523.GA5112@ziepe.ca> <10ccf01b-f13a-d626-beba-cbee70770cf1@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <10ccf01b-f13a-d626-beba-cbee70770cf1@redhat.com> X-Rspamd-Queue-Id: 3E6FF7001A05 X-Stat-Signature: nhcxnuy4ge1fhmt3xrwynk1ni5rq6u7u Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b=IzeKHci6; dmarc=none; spf=pass (imf02.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.160.179 as permitted sender) smtp.mailfrom=jgg@ziepe.ca X-Rspamd-Server: rspam02 X-HE-Tag: 1637676430-997865 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, Nov 23, 2021 at 02:39:19PM +0100, David Hildenbrand wrote: > > > >> 2) Could be provide a mmu variant to ordinary users that's just good > >> enough but maybe not as fast as what we have today? And limit > >> FOLL_LONGTERM to special, privileged users? > > > > rdma has never been privileged > > Feel free to correct me if I'm wrong: it requires special networking > hardware and the admin/kernel has to prepare the system in a way such > that it can be used. Not really, plug in the right PCI card and it works "special" is a bit of a reach since almost every NIC sold in the > 100GB segment supports some RDMA. Jason