[RFC PATCH v2 0/3] RDMA: add dma-buf support

[Jason Gunthorpe]

On Fri, Jul 03, 2020 at 02:52:03PM +0200, Daniel Vetter wrote:

> So maybe I'm just totally confused about the rdma model. I thought:
> - you bind a pile of memory for various transactions, that might
> happen whenever. Kernel driver doesn't have much if any insight into
> when memory isn't needed anymore. I think in the rdma world that's
> called registering memory, but not sure.

Sure, but once registered the memory is able to be used at any moment with
no visibilty from the kernel.

Unlike GPU the transactions that trigger memory access do not go
through the kernel - so there is no ability to interrupt a command
flow and fiddle with mappings.

Jason