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Date: Thu, 7 May 2015 16:33:43 +0200
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH] UserfaultFD: Rename uffd_api.bits into .features
Message-ID: <20150507143343.GG13098@redhat.com>
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To: Pavel Emelyanov <xemul@parallels.com>
Cc: Linux MM <linux-mm@kvack.org>

On Thu, May 07, 2015 at 05:28:46PM +0300, Pavel Emelyanov wrote:
> Yup, this is very close to what I did in my set -- introduced a message to
> report back to the user-space on read. But my message is more than 8+2*1 bytes,
> so we'll have one message for 0xAA API and another one for 0xAB (new) one :)

I slightly altered it to fix an issue with packet alignments so it'd
be 16bytes.

How big is your msg currently? Could we get to use the same API?

UFFDIO_REGISTER_MODE_FORK

or 

UFFDIO_REGISTER_MODE_NON_COOPERATIVE would differentiate if you want
to register for fork/mremap/dontneed events as well or only the
default (UFFD_EVENT_PAGEFAULT).

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