Re: [PATCH 19/21] userfaultfd: remap_pages: UFFDIO_REMAP preparation

Linus Torvalds
2015-03-05T19:32:24Z

On Thu, Mar 5, 2015 at 10:51 AM, Andrea Arcangeli <aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>
> Thanks for your idea that the UFFDIO_COPY is faster, the userland code
> we submitted for qemu only uses UFFDIO_COPY|ZEROPAGE, it never uses
> UFFDIO_REMAP.

Ok. So there's no actual expected use of the remap interface. Good.
That makes this series more palatable, since the rest didn't raise my
hackles much.

(But yeah, the documentation patch didn't really explain the uses very
much or at all, so I think something more is needed in that area).

Linus