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[142.68.57.212]) by smtp.gmail.com with ESMTPSA id b7sm6449933qtj.15.2019.12.23.10.24.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 23 Dec 2019 10:24:47 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1ijSNq-0007Pv-LV; Mon, 23 Dec 2019 14:24:46 -0400 Date: Mon, 23 Dec 2019 14:24:46 -0400 From: Jason Gunthorpe To: Dan Williams Cc: John Hubbard , Leon Romanovsky , Andrew Morton , Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Christoph Hellwig , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jens Axboe , Jonathan Corbet , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , bpf@vger.kernel.org, Maling list - DRI developers , KVM list , linux-block@vger.kernel.org, Linux Doc Mailing List , linux-fsdevel , linux-kselftest@vger.kernel.org, "Linux-media@vger.kernel.org" , linux-rdma , linuxppc-dev , Netdev , Linux MM , LKML , Maor Gottlieb Subject: Re: [PATCH v11 00/25] mm/gup: track dma-pinned pages: FOLL_PIN Message-ID: <20191223182446.GA28321@ziepe.ca> References: <20191216222537.491123-1-jhubbard@nvidia.com> <20191219132607.GA410823@unreal> <20191219210743.GN17227@ziepe.ca> <42a3e5c1-6301-db0b-5d09-212edf5ecf2a@nvidia.com> <20191220133423.GA13506@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) 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 Fri, Dec 20, 2019 at 04:32:13PM -0800, Dan Williams wrote: > > > There's already a limit, it's just a much larger one. :) What does "no limit" > > > really mean, numerically, to you in this case? > > > > I guess I mean 'hidden limit' - hitting the limit and failing would > > be managable. > > > > I think 7 is probably too low though, but we are not using 1GB huge > > pages, only 2M.. > > What about RDMA to 1GB-hugetlbfs and 1GB-device-dax mappings? I don't think the failing testing is doing that. It is also less likely that 1GB regions will need multi-mapping, IMHO. Jason