Re: [rfc] generic allocator and mspec driver

David Mosberger
2005-02-15T18:04:49Z

>>>>> On 15 Feb 2005 03:43:10 -0500, Jes Sorensen <jes@wildopensource.com> said:

>>>>> "Tony" = Luck, Tony <tony.luck@intel.com> writes:

Tony> Is ia64 the only architecture that has uncached vs. cached
Tony> access issues? If so, the PG_arch_1 might have to be the
Tony> solution, but surely others have cache coherence problems too
Tony> if there are mixed cacheable and uncacheable access to the
Tony> same memory? In which case a new generic bit would be more
Tony> appropriate.

Jes> None of the ones I know well have this problem, but I have
Jes> little knowledge about this level of stuff on most
Jes> architectures. The ones that could have issues would probably
Jes> be like PPC, PARISC and maybe Alpha .....

Well, any CPU that allows overlapping mappings and does _any_ sort of
speculative accesses will have a problem. The only question is
whether you'll get an explicit error notification (e.g., MCA) or
silent data corruption.

--david