Re: [Xen-devel] domain creation vs querying free memory (xend and xl)

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Oct 17, 2012 at 6:30 PM, George Dunlap
<George.Dunlap@xxxxxxxxxxxxx> wrote:
> A VM should be given a
> fixed amount of memory above which the balloon driver cannot go.

I forgot to mention: there is a limit you can set in the hypervisor
such that the balloon driver cannot go up past a certain point.  And
since 4.1, I think, it has been possible to set this limit to below
what the VM currently has alloated -- the effect being, that as soon
as the VM balloons down to that point, it cannot balloon back up.
Xapi sets this value at the same time it sets the balloon target in
xenstore, so that it can have confidence that once it actually has
some free memory, it won't disappear from under its feet.

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