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xen-devel
Re: [Xen-devel] Re: [PATCH] EPT: Only sync pcpus on which a domain's vcp
George Dunlap wrote:
In theory, the memory handed back by the balloon driver shouldn't be
touched by the OS. I think it would be OK if guess accesses to that
gfn space didn't fail for the guest giving up the pages; however, we
can't give the memory to another guest until we know for sure that the
first guest can't possibly access it anymore. I think we should be
able to modify the balloon driver to "batch" some number of updates;
say, 1024 at a time. Paul, any thoughts on this?
The decrease_reservation op is called with however many PFNs can fit
into the Windows MDL structure (8184 for a 32-bit VM) so we already do
things in pretty big batches.
Paul
--
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Paul Durrant, Software Engineer
Citrix Systems (R&D) Ltd.
First Floor, Building 101
Cambridge Science Park
Milton Road
Cambridge CB4 0FY
United Kingdom
TEL: x35957 (+44 1223 225957)
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