Re: [PATCH 0/7] userfaultfd: add support for shared memory

[Andrea Arcangeli]

Hi Mike,

On Thu, Aug 04, 2016 at 11:14:11AM +0300, Mike Rapoport wrote:
> These patches enable userfaultfd support for shared memory mappings. The
> VMAs backed with shmem/tmpfs can be registered with userfaultfd which
> allows management of page faults in these areas by userland.
> 
> This patch set adds implementation of shmem_mcopy_atomic_pte for proper
> handling of UFFDIO_COPY command. A callback to handle_userfault is added
> to shmem page fault handling path. The userfaultfd register/unregister
> methods are extended to allow shmem VMAs.
> 
> The UFFDIO_ZEROPAGE and UFFDIO_REGISTER_MODE_WP are not implemented which
> is reflected by userfaultfd API handshake methods.

This looks great.

I'm getting rejects during rebase but not because of your changes, I
think I'll fold some patches that I originally fixed up incrementally,
in order to reduce the reject churn.

Thanks,
Andrea