Re: [kvm-devel] [PATCH] KVM simplified virtio balloon driver

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Anthony Liguori wrote:
It would be very useful too to write vb->num_pages into the config space
whenever it was updated.  This way, the host can easily keep track of
where the guest is at in terms of ballooning.
OTOH it's currently pretty obvious (and usually fatal) if the guest has trouble meeting the balloon requirements. A serious host needs a way of detecting stress in the guest anyway, which this doesn't offer until it's too late...

The question I'm interested in answering though is not if but when. I would like to know when the guest has reached it's target.


Yes. We don't want to activate the RSS controller immediately; give the guest some time to adjust voluntarily.


--
Any sufficiently difficult bug is indistinguishable from a feature.

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