Re: [PATCH 3/3] resource: Introduce resource cache

[Andi Kleen]

Dan Williams <dan.j.williams@xxxxxxxxx> writes:
>
> The underlying issue is that the x86-PAT implementation wants to
> ensure that conflicting mappings are not set up for the same physical
> address. This is mentioned in the developer manuals as problematic on
> some cpus. Andi, is lookup_memtype() and track_pfn_insert() still
> relevant?

There have been discussions about it in the past, and the right answer
will likely differ for different CPUs: But so far the official answer
for Intel CPUs is that these caching conflicts should be avoided.

So I guess the cache in the original email makes sense for now.

-Andi