[BUG] rebuild_sched_domains considered dangerous

[Peter Zijlstra]

On Wed, 2011-03-09 at 14:31 +0100, Martin Schwidefsky wrote:
> > But if you don't also update the cpu->node memory mappings (which I
> > think it near impossible) what good is it to change the scheduler
> > topology?
> 
> The memory for the different LPARs is striped over all nodes (or books as we
> call them). We heavily rely on the large shared cache between the books to hide
> the different memory access latencies. 

Right, so effectively you don't have NUMA due to that striping. So why
then change the CPU topology? Simply create a topology without NUMA and
keep it static, that accurately reflects the memory topology.