From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [LSF/MM TOPIC] Filesystem-DAX, page-pinning, and RDMA Date: Thu, 1 Feb 2018 16:27:20 -0700 Message-ID: <20180201232720.GX23352@mellanox.com> References: <20180129233324.GC4526@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20180129233324.GC4526@redhat.com> Sender: owner-linux-mm@kvack.org To: Jerome Glisse Cc: Dan Williams , lsf-pc@lists.linux-foundation.org, Christoph Hellwig , Michal Hocko , Linux MM , linux-rdma , linux-nvdimm@lists.01.org List-Id: linux-rdma@vger.kernel.org On Mon, Jan 29, 2018 at 06:33:25PM -0500, Jerome Glisse wrote: > Between i would also like to participate, in my view the burden should > be on GUP users, so if hardware is not ODP capable then you should at > least be able to kill the mapping/GUP and force the hardware to redo a > GUP if it get any more transaction on affect umem. Can non ODP hardware > do that ? Or is it out of the question ? For RDMA we can have the HW forcibly tear down the MR, but it is incredibly disruptive and nobody running applications would be happy with this outcome. Jason -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org