For the record, Transcendent Memory is not a copy-on-write
mechanism, doesn't deal with shadow tables or PTE read/write
bits, and is really not exotic at all. It's a simple (though
paravirtualized) mechanism for optimizing the usage of
unutilized or underutilized physical memory while ensuring
(most of) that memory is synchronously reclaimable for
unexpectedly urgent needs. :-)
Dan
> -----Original Message-----
> From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx]
> Sent: Monday, March 16, 2009 11:41 AM
> To: Jeremy Fitzhardinge
> Cc: Xen-devel; Long Wang
> Subject: [Xen-devel] Re: how to enable shadow page table? Do I have to
> run HVM guest systems for shadow paging mode?
>
>
> At 16:30 +0000 on 16 Mar (1237221012), Jeremy Fitzhardinge wrote:
> > Long Wang wrote:
> > > I am working on a research project based on Xen 3.3.1. I
> want to use the
> > > shadow page table for setting guest system memory pages
> as read-only and/or
> > > dirty, and perform a copy-on-write mechanism when these
> memory pages are
> > > updated.
>
> Several people are already working on copy-on-write memory in Xen, or
> variations on that theme (Mike Sun, Patrick Colp, John Byrne, and
> others) as well as more exotic things like Difference Engine and
> Transcendent Memory. It would probably be better to talk to those
> people and try to help their efforts than start from scratch.
>
> Patrick Colp's slides from the most recent Xen Summit give an idea of
> one method of implementing it:
> http://www.xen.org/files/xensummit_oracle09/VMSnapshots.pdf
>
> Cheers,
>
> Tim.
>
> --
> Tim Deegan <Tim.Deegan@xxxxxxxxxx>
> Principal Software Engineer, Citrix Systems (R&D) Ltd.
> [Company #02300071, SL9 0DZ, UK.]
>
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>
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