Re: [Xen-devel] [PATCH] xen/tmem: Don't use map_domain_page for long-life-time pages.

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 13/06/13 14:55, Ian Campbell wrote:
> On Thu, 2013-06-13 at 14:49 +0100, Jan Beulich wrote:
> > > > > On 13.06.13 at 15:24, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> > > Did I understand correctly that the map_domain_page() was required on
> > >   >5TiB systems, presumably because of limited virtual address space?  In
> > > which case this code will fail on those systems?
> > >
> > > If that is the case, then we need to have a way to make sure tmem cannot
> > > be enabled on such systems.
> > Tmem is full of assumptions that all memory is mapped, and hence
> > one of the requirements here was to disable tmem when that
> > assumption is not true (until eventually tmem would get fixed).
> Isn't this change moving it further away from that fixed state though?
Perhaps, but it's probably the best change for 4.3 at this point.

 -George


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