From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754318AbbCESQM (ORCPT <rfc822;w@1wt.eu>);
	Thu, 5 Mar 2015 13:16:12 -0500
Received: from mx2.parallels.com ([199.115.105.18]:39620 "EHLO
	mx2.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753464AbbCESQI (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 5 Mar 2015 13:16:08 -0500
Message-ID: <54F89D48.3020707@parallels.com>
Date: Thu, 5 Mar 2015 21:15:36 +0300
From: Pavel Emelyanov <xemul@parallels.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0
MIME-Version: 1.0
To: Andrea Arcangeli <aarcange@redhat.com>, <qemu-devel@nongnu.org>,
        <kvm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-mm@kvack.org>, <linux-api@vger.kernel.org>,
        Android Kernel Team <kernel-team@android.com>
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>
Subject: Re: [PATCH 00/21] RFC: userfaultfd v3
References: <1425575884-2574-1-git-send-email-aarcange@redhat.com>
In-Reply-To: <1425575884-2574-1-git-send-email-aarcange@redhat.com>
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
X-Originating-IP: [89.169.95.100]
X-ClientProxiedBy: US-EXCH.sw.swsoft.com (10.255.249.47) To
 US-EXCH.sw.swsoft.com (10.255.249.47)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


> 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