Re: [RFC][patch 2/10] Multiple vector domain support - cpu and domain management

[david mosberger <dmosberger@gmail.com>]

I didn't have time to look at these patches yet, but what I was
wondering: SGI Altix already does per-CPU interrupts.  Do we really
need another abstraction or could you use the same approach as SGI?

  --david

On 7/14/05, Ashok Raj <ashok.raj@intel.com> wrote:
> On Thu, Jul 14, 2005 at 06:20:51PM +0900, Kenji Kaneshige wrote:
> >
> > This patch add the code to handle the relationship between cpu and
> > domains. We need more consideration about how to separate vector
> > domains.
> >
> > Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
> >
> > ---
> >
> 
> Should we consider this based on some mach-* like schemes, so for e.g in
> NUMA case we could use node as a VECTOR_DOMAIN? ... or maybe we could
> somehow tie this into CPUSETS?..
> 
> > +
> > +#ifdef CONFIG_VECTOR_DOMAIN
> > +int ia64_cpu_domain_map[NR_CPUS];
> > +cpumask_t ia64_domain_cpumask[NR_VECTOR_DOMAINS];
> > +
> > +void __devinit
> > +ia64_attach_cpu_to_domain (int cpu)
> > +{
> > +     static int domain = -1;
> > +
> > +     /* Simple Round Robin for now */
> > +     if (++domain >= NR_VECTOR_DOMAINS)
> > +             domain = 0;
> > +     ia64_cpu_domain_map[cpu] = domain;
> > +     cpu_set(cpu, ia64_domain_cpumask[domain]);
> > +}
> > +#endif /* CONFIG_VECTOR_DOMAIN */
> 
> --
> Cheers,
> Ashok Raj
> - Open Source Technology Center
> -
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