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, 25 Jan 2018 09:08:48 -0700 Message-ID: <20180125160848.GE10706@ziepe.ca> References: <1516852902.3724.4.camel@wdc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dan Williams Cc: Bart Van Assche , "lsf-pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" , "hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org" , "linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org" , "mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org" List-Id: linux-rdma@vger.kernel.org On Wed, Jan 24, 2018 at 11:02:16PM -0800, Dan Williams wrote: > No, in 3 dimensions since there is a need to support non-ODP RDMA > hardware, hypervisors want to coordinate DMA for guests, and non-RDMA > hardware also pins memory indefinitely like V4L2. So it's bigger than > RDMA, but that will likely be the first consumer of this 'longterm > pin' mechanism. BTW, did you look at VFIO? I think it should also have this problem right? Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html