Re: [RFC 2/2] virtio_balloon: auto-ballooning support

[Rik van Riel]

On 05/13/2013 11:35 AM, Michael S. Tsirkin wrote:
> On Mon, May 13, 2013 at 11:22:58AM -0400, Rik van Riel wrote:

> > I believe the Google patches still included some way for the
> > host to initiate balloon inflation on the guest side, because
> > the guest internal state alone is not enough to see when the
> > host is under memory pressure.
> >
> > I discussed the project with the Google developers in question
> > a little over a year ago, but I do not remember whether their
> > pressure notification went through qemu, or directly from the
> > host kernel to the guest kernel...
>
> So increasing the max number of pages in balloon
> indicates host memory pressure to the guest?
> Fair enough but I wonder whether there's a way to
> make it more explicit in the interface, somehow.

There may be a better way to do this, but I am really not sure
what that would be. What properties would you like to see in
the interface? What kind of behaviour are you looking for?

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