From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oren Laadan Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch Date: Mon, 08 Nov 2010 13:14:12 -0500 Message-ID: <4CD83DF4.4080009@cs.columbia.edu> References: <4CD26948.7050009@kernel.org> <20101104164401.GC10656@sundance.ccs.neu.edu> <4CD3CE29.2010105@kernel.org> <4CD5DCE3.3000109@cs.columbia.edu> <20101107194222.GG31077@sundance.ccs.neu.edu> <4CD71A6B.3020905@cs.columbia.edu> <20101107230516.GJ31077@sundance.ccs.neu.edu> <4CD774CA.8030004@cs.columbia.edu> <20101108162630.GN31077@sundance.ccs.neu.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20101108162630.GN31077@sundance.ccs.neu.edu> Sender: linux-kernel-owner@vger.kernel.org To: Gene Cooperman Cc: Kapil Arya , Tejun Heo , ksummit-2010-discuss@lists.linux-foundation.org, linux-kernel@vger.kernel.org, hch@lst.de, Linux Containers List-Id: containers.vger.kernel.org Hi, Ok, I'll bite the bullet for now - to be continued... Just one important clarification: >> Linux-cr can do live migration - e.g. VDI, move the desktop - in >> which case skype's sockets' network stacks are reconstructed, >> transparently to both skype (local apps) and the peer (remote apps). >> Then, at the destination host and skype continues to work. > > That's a really cool thing to do, and it's definitely not part of what > DMTCP does. It might be possible to do userland live migration, > but it's definitely not part of our current scope. But if we're talking > about live migration, have you also looked at the work of > Andres Lagar Caviilla on SnowFlock? > http://andres.lagarcavilla.com/publications/LagarCavillaEurosys09.pdf > He does live migration of entire virtual machines, again with very > small delay. Of course, the issue for any type of live migration is that > if the rate of dirtying pages is very high (e.g. HPC), then there is > still a delay or slow response, due to page faults to a remote host. VMware, Xen and KVM already do live migration. However, VMs are a separate beast. We are concerned about _application_ level c/r and migration (complete containers or individual applications). Many proven techniques from the VM world apply to our context too (in your example, post-copy migration). Oren.