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

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 06/07/12 15:05, 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).
No, you can do batches at a time, based on how much free memory you 
have.  If you have enough free memory to keep two copies in RAM at a 
time, you might as well.  But even as little as moving 1MB at a time 
would probably be easily achievable and not to much overhead.
 -George

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