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xen-ia64-devel
Re: [Xen-ia64-devel] [patch] make Xen assign meta-physical memory in spa
On Fri, Dec 29, 2006 at 10:38:19AM +0100, Jes Sorensen wrote:
> Tristan Gingold wrote:
> > On Thu, Dec 28, 2006 at 05:52:57PM +0100, Jes Sorensen wrote:
> > [...]
> >> With these patches applied I am seeing PAL warnings about unimplemented
> >> PAL call 42 and then a cachable vs uncacheable access in xenmisc.c.
> >> Anyone else seeing this?
> > Yes, PAL call 42 has never been implemented. A dummy implementation should
> > be
> > rather easy, but it's difficult to return an accurate value because of
> > vcpu migration.
>
> Hi Tristan,
>
> Nice to see you're still popping up here :)
>
> One thing I would like to see on the longer term is a feature allowing
> a cpumask to be set for a vcpu so it is only schduled within cpus on a
> specific physical node. That way this call would start making sense.
I think this feature already exist. The Xen scheduler has a bitmask
(initialized with all 1). Vcpus can only be scheduled on cpu whose bit is set.
This feature could be used for NUMA, although it may requires additionnal tools.
Tristan.
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