Re: [RFC][PATCH] avoid creating empty nodes [0/2]

Jack Steiner
2006-03-30T01:38:16Z

On Thu, Mar 30, 2006 at 08:31:02AM +0900, KAMEZAWA Hiroyuki wrote:
> On Wed, 29 Mar 2006 08:37:34 -0600
> Jack Steiner <steiner@sgi.com> wrote:
> > ACPI3.0 will have a way to describe these IO nodes. We have not done the
> > design but when ACPI3.0 is available, we intend to make the kernel fully
> > aware of IO-only nodes.
> >
>
> Then, we should set I/O nodes's pxm to pxm_online_map (I added in patch) in
> acpi_numa_arch_fixup() in addition to cpus and memory. But there are no codes
> to find available I/O nodes now.
> Correct ?

Correct for ACPI2.0. ACPI3.0 has the PXM for IO buses (at least I think it was
at the bus level - I don't have the spec right now) in one of the IO tables.

>
> BTW I heared ACPI3.0 can define pxm > 256. If we support it, entire codes should
> be rewrote ;(.

Yes. IIRC, PXM is a 32-bits in some tables, 24-bits in other tables.

>
> -- Kame

---
Jack