Re: [RFC PATCH] Exporting Guest RAM information for NUMA binding

Chris Wright
2011-11-30T16:33:27Z

* Peter Zijlstra (a.p.zijlstra@chello.nl) wrote:
> On Wed, 2011-11-30 at 21:52 +0530, Dipankar Sarma wrote:
> >
> > Also, if at all topology changes due to migration or host kernel decisions,
> > we can make use of something like VPHN (virtual processor home node)
> > capability on Power systems to have guest kernel update its topology
> > knowledge. You can refer to that in
> > arch/powerpc/mm/numa.c.
>
> I think that fail^Wfeature of PPC is terminally broken. You simply
> cannot change the topology after the fact.

Agreed, there's too many things that consult topology once and never
look back.