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

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.


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