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Re: [Xen-devel] [PATCH] RFC: initial libxl support for xenpaging
On Fri, 2012-02-24 at 17:12 +0000, Andres Lagar-Cavilla wrote:
> Sharing + balloon is mostly a bad idea. It's not forbidden or broken
> from the hypervisor angle, but it's a lose-lose game. Ballooning a
> shared page gains you nothing. The ballooner can't know what is shared
> and what isn't, in order to make an educated decision. And the sharer
> can't foresee what the balloon will victimize.
Doesn't ballooning generally evict unused pages, because it allocates
new _free_ pages, even if they were shared is there any benefit to doing
so?
Or is it more of a second order effect, e.g. ballooning can cause the
guest to swap out stuff which could have been shared?
Ian.
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