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Date: Thu, 5 Mar 2015 21:15:36 +0300
From: Pavel Emelyanov <xemul@parallels.com>
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Subject: Re: [PATCH 00/21] RFC: userfaultfd v3
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Cc: "Kirill A. Shutemov" <kirill@shutemov.name>, Sanidhya Kashyap <sanidhya.gatech@gmail.com>, zhang.zhanghailiang@huawei.com, Linus Torvalds <torvalds@linux-foundation.org>, Andres Lagar-Cavilla <andreslc@google.com>, Dave Hansen <dave@sr71.net>, Paolo Bonzini <pbonzini@redhat.com>, Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>, Andy Lutomirski <luto@amacapital.net>, Andrew Morton <akpm@linux-foundation.org>, Sasha Levin <sasha.levin@oracle.com>, Hugh Dickins <hughd@google.com>, Peter Feiner <pfeiner@google.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Christopher Covington <cov@codeaurora.org>, Johannes Weiner <hannes@cmpxchg.org>, Robert Love <rlove@google.com>, Dmitry Adamushko <dmitry.adamushko@gmail.com>, Neil Brown <neilb@suse.de>, Mike Hommey <mh@glandium.org>, Taras Glek <tglek@mozilla.com>, Jan Kara <jack@suse.cz>, KOSAKI Motohiro <kosaki.motohiro@gmail.com>, Michel Lespinasse <walken@google.com>, Minchan Kim <minchan@kernel.org>, Keith Packard <keithp@keithp.com>, "Huangpeng (Peter)" <peter.huangpeng@huawei.com>, Anthony Liguori <anthony@codemonkey.ws>, Stefan Hajnoczi <stefanha@gmail.com>, Wenchao Xia <wenchaoqemu@gmail.com>, Andrew Jones <drjones@redhat.com>, Juan Quintela <quintela@redhat.com>


> All UFFDIO_COPY/ZEROPAGE/REMAP methods already support CRIU postcopy
> live migration and the UFFD can be passed to a manager process through
> unix domain sockets to satisfy point 5).

Yup :) That's the best (from my POV) point of ufd -- the ability to delegate
the descriptor to some other task. Though there are several limitations (I've
expressed them in other e-mails), I'm definitely supporting this!

The respective CRIU code is quite sloppy yet, I will try to brush one up and
show soon.

Thanks,
Pavel

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