Re: [PATCH v3 5/6] mm/gup: migrate pinned pages out of movable zone

[Jason Gunthorpe]

On Sat, Dec 12, 2020 at 08:29:11AM +0100, David Hildenbrand wrote:

> > Racing with another GUP in another thread is also not reasonable, so
> > failing to isolate can't be a failure
> 
> Having VMs with multiple vfio containers is certainly realistic, and
> optimizing in user space to do vfio mappings concurrently doesn‘t
> sound too crazy to me. But I haven‘t checked if vfio common code
> already handles such concurrency.

There is a lot more out there than vfio.. RDMA already does concurrent
pin_user_pages in real apps

Jason