Re: [Xen-devel] Re: [PATCH] EPT: Only sync pcpus on which a domain's vcpus might be running

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

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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