> > The other thing is, as I mentioned in the other email, I still don't know > how the current RW protection would work for anonymous. I don't yet think > the user swapper can read the anon page with RW-protected pgtables. So far > my understanding is maybe you only care about shmem so it's fine, but it'll > always be great to confirm with you.
I wonder if uffdio_move could be used for a swapper implementation instead? If we ever have to read from a protnone page, maybe we could teach ptrace access to do it, or have something that can read from prot_none areas -- like uffdio_copy, which can write to prot-none areas. -- Cheers, David
