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

[David Hildenbrand]

On 14.12.20 14:36, Jason Gunthorpe wrote:
> 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

I actually misread your comment. I think we both agree that temporary
isolation failures must not lead to a failure.

-- 
Thanks,

David / dhildenb