On 11/30/2016 8:01 PM, Logan Gunthorpe wrote: > > > On 30/11/16 09:23 AM, Jason Gunthorpe wrote: >>> Two cases I can think of are RDMA access to an NVMe device's controller >>> memory buffer, >> >> I'm not sure on the use model there.. > > The NVMe fabrics stuff could probably make use of this. It's an > in-kernel system to allow remote access to an NVMe device over RDMA. So > they ought to be able to optimize their transfers by DMAing directly to > the NVMe's CMB -- no userspace interface would be required but there > would need some kernel infrastructure. Yes, that's what I was thinking. The NVMe/f driver needs to map the CMB for RDMA. I guess if it used ZONE_DEVICE like in the iopmem patches it would be relatively easy to do. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
