Re: [PATCH v1 06/11] mm: support GUP-triggered unsharing via FAULT_FLAG_UNSHARE (!hugetlb)

[Jason Gunthorpe]

On Tue, Dec 21, 2021 at 06:40:30PM +0100, David Hildenbrand wrote:

> 2) is certainly the cherry on top. But it just means that R/O pins don't
> have to be the weird kid. And yes, achieving 2) would require
> FAULT_FLAG_EXCLUSIVE / FAULT_FLAG_UNSHARED, but it would really 99% do
> what existing COW logic does, just bypass the "map writable" and
> "trigger write fault" semantics.

I still don't agree with this - when you come to patches can you have
this work at the end and under a good cover letter? Maybe it will make
more sense then.

Thanks,
Jason