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

Anthony Liguori wrote:

quoted

quoted

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.