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

[Paul Durrant <paul.durrant@citrix.com>]

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

-- 
===============================
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)
===============================