Re: [LSF/MM TOPIC] Filesystem-DAX, page-pinning, and RDMA

Jason Gunthorpe
2018-02-01T23:27:20Z

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

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