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

[Brendan Cully <brendan@xxxxxxxxx>]

On Friday, 14 November 2008 at 13:35, Mike Sun wrote:
> The modification to do a checkpoint using the live migration mechanism
> of pre-copying is a trivial one and just something we're benchmarking
> against with our CoW solution.  Here's a patch that changes 'xm save
> -c' to do the checkpoint using the live migration mechanism instead of
> the default way.  Word of warning: it's a hack and I haven't made the
> changes necessary so that the checkpoint file won't contain the pages
> copied during the copy rounds so the checkpoint file will be much
> larger than necessary.
> 
> I'm not sure why a checkpoint with pre-copying mechanism hasn't been
> enabled in Xen yet as the necessary code is all there.

I think it's mostly just that the semantics are a bit weird -- you
don't have a great idea what point in guest time corresponds to the
checkpoint you'll end up with. But we've happily that mode here for
things like coordinated checkpoints.


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