From owner-freebsd-hackers@FreeBSD.ORG  Wed Jan 12 21:17:45 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id D427416A4DA
	for <freebsd-hackers@freebsd.org>;
	Wed, 12 Jan 2005 21:17:45 +0000 (GMT)
Received: from mail-svr1.cs.utah.edu (brahma.cs.utah.edu [155.98.64.200])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 6DAFD43D53
	for <freebsd-hackers@freebsd.org>;
	Wed, 12 Jan 2005 21:17:45 +0000 (GMT)
	(envelope-from saggarwa@cs.utah.edu)
Received: from localhost (localhost [127.0.0.1])
	by mail-svr1.cs.utah.edu (Postfix) with ESMTP id 1D14C34867
	for <freebsd-hackers@freebsd.org>;
	Wed, 12 Jan 2005 14:17:41 -0700 (MST)
Received: from mail-svr1.cs.utah.edu ([127.0.0.1])
 by localhost (mail-svr1.cs.utah.edu [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id 25458-09 for <freebsd-hackers@freebsd.org>;
 Wed, 12 Jan 2005 14:17:40 -0700 (MST)
Received: from faith.cs.utah.edu (faith.cs.utah.edu [155.98.65.40])
	by mail-svr1.cs.utah.edu (Postfix) with ESMTP id CC83A34864
	for <freebsd-hackers@freebsd.org>;
	Wed, 12 Jan 2005 14:17:40 -0700 (MST)
Received: by faith.cs.utah.edu (Postfix, from userid 4973)
	id 4388D2EC21; Wed, 12 Jan 2005 14:17:38 -0700 (MST)
Received: from localhost (localhost [127.0.0.1])
	by faith.cs.utah.edu (Postfix) with ESMTP id 84B2734406
	for <freebsd-hackers@freebsd.org>;
	Wed, 12 Jan 2005 21:17:38 +0000 (UTC)
Date: Wed, 12 Jan 2005 14:17:38 -0700 (MST)
From: Siddharth Aggarwal <saggarwa@cs.utah.edu>
To: freebsd-hackers@freebsd.org
Message-ID: <Pine.GSO.4.50L0.0501121412570.2985-100000@faith.cs.utah.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Virus-Scanned: amavisd-new at cs.utah.edu
Subject: process checkpoint restore facility now in DragonFly BSD
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 12 Jan 2005 21:17:46 -0000


Hi all,

I am responding to a post back in Oct 2003 when the checkpointing feature
was announced for DragonFly. I have been doing some research on this, and
have seen some projects that use Xen VMM to achieve checkpoints of guest
OSes.

So I was looking for inputs from people as to what everyone feels about
checkpointing, whether it should be done at the physical machine level or
VM level. Pros and Cons of each approach, if any further development was
done on DragonFly for checkpoint since then and if it was stopped, why?
Are there serious limitations to checkpointing a physical machine?

Sorry for such a vague posting, but I thought this would be a good
platform to get some feedback.

Thanks,
Sid.