RE: [Xen-devel] PG_arch_1

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

> On 7 Dec 2005, at 03:11, Tian, Kevin wrote:
> >> Any thought on this apparent conflict?
> >>
> >> Thanks,
> >> Dan
> >
> > Add a new PG_arch_2, since there're two level architectures within 
> > xenlinux world?
> 
> Yes, I think this is the right answer. There are loads of spare bits 
> available to stealing one should be no problem.
> 
>   -- Keir

True, but I've heard tell that these bits are jealously guarded.

In any case, PG_arch_1 is used for other purposes on ia64, ppc,
ppc64, sparc64, arm, mips, pa-risc, and even has semantics for
linux arch-neutral code (look for PG_Arch_1 in
linux/Documentation/cachetlb.txt... does Xen depend on this
behavior?), and the eventual goal is to merge upstream,
it might be best if Xen defines it as a new bit ("PG_foreign"?
no sense being vague by calling it PG_arch_2) rather than
overloads PG_arch_1?

Dan

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