Re: the trouble with large pages

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

On Fri, 2007-09-07 at 17:00 +0200, Segher Boessenkool wrote:
> > The PowerPC 440 Linux kernel uses 256MB pages for the linear mapping.
> > When we run that as a guest, those pages would of course need to be
> > physically contiguous in the host.
> 
> > Another possibility is to fake out guest large pages by actually using
> > small pages on the host, and handle the extra faults in KVM without
> > notifying the guest.
> 
> That seems like the best plan, for a first shot anyway.  Also,
> even when you do support backing 256MB pages with 256MB pages,
> you probably still want the small-page backing as a backup in
> case you run out of large pages.

If you want to be able support things like migration, it's alsa
important to be able to demote large pages to smaller ones so that you
can do finer granularity dirty tracking.

Regards,

Anthony Liguori

> Segher
> 
> 
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