Re: [Xen-devel] [PATCH 2 of 2 RFC] xl: allow for moving the domain's memory when changing vcpu affinity

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-07-06 at 15:05 +0100, Dario Faggioli wrote:
> On Fri, 2012-07-06 at 14:25 +0100, Ian Campbell wrote: 
> > We could do something cleverer for HVM (or hybrid) guests to migrate
> > pages while the guest is live but migrating a page under a PV guest's
> > feet requires quiescing it in the style of a migrate.
> > 
> Which, as we're talking about the same host, means reaching a point
> where I have two full copies of the guest memory in RAM, or not?
> 
> (Just trying to figure out if I understood things sensibly).

You could move it over in chunks, freeing as you go so if chunk size was
1M you would only need 1M of extra memory, not the full domain size.

Ian.


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