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[Xen-devel] physmap deallocation on balloon?

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Subject: [Xen-devel] physmap deallocation on balloon?
From: "Michael R. Hines" <mhines@xxxxxxxxxxxxxxxxx>
Date: Tue, 08 Apr 2008 20:39:10 -0400
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Currently, as I understand PV memory allocation,
the Guest's pfn -> mfn physmap will get populated
on-demand as the guest uses more an more of its
memory reservation.

Is it possible to also make this go in the reverse direction?

For example: let's say we have a guest that is mostly idle
and has a great deal of free memory and we decide to balloon
down the domain. In addition to decreasing the domain's
reservation, is it also possible to remove the physmap entries
in an on-demand fashion as memory is freed up?

Michael R. Hines
Live long and prosper...

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