Re: [Xen-research] Re: [Xen-users] xm save -c

["dwight at supercomputer.org" <dwight@xxxxxxxxxxxxxxxxx>]

Thanks for the kind offer, Mike. I too would be interested in seeing 
both sets of modifications when they are ready. As well as the paper 
when it's finished.

   -dwight-

On Thursday 13 November 2008 05:45:56 pm Mike Sun wrote:
> Hi Nick,
>
> > I was wondering if anyone knows of a way to "checkpoint" without
> > pausing the domain?  I can't do something like an hourly
> > checkpoint if the domain pauses every hour - the users on the
> > domUs would kill me.  Is "seamless checkpointing" something
> > that's being developed, something that can be done another way,
> > or something I should just give up on now?
>
> I've been working on something for my research that probably
> addresses what you're looking for: low latency/downtime
> checkpointing.  There are two ways I know this can be done.
>
> You can modify the live-migration mechanism in Xen to save a
> checkpoint instead of migrating to another host.  I don't know why
> this hasn't been provided in the xm save tool, but it's a pretty
> simple hack to get working since the xm migrate and xm save
> codebase is basically the same.  If you're interested, I can send
> patches to allow you to do that.  Then basically on a checkpoint,
> pre-copying would be used to cut the actual time the domU has to
> be paused.
>
> The other way that I've implemented for my research project is to
> use copy-on-write.  I've implemented a prototype and in the middle
> of writing paper for publication.  It's not suited for production
> use, but I'd be glad to contribute the code if there's interest.
>
> Mike
>
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