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

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Message-ID: <20160804185424.evlipxlvnlymljtu@redhat.com>
Date:	Thu, 4 Aug 2016 20:54:24 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Pavel Emelyanov <xemul@...tuozzo.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7]  userfaultfd: add support for shared memory

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