Re: [PATCH] cpu-topology: warn if NUMA configurations conflicts with lower layer

[Morten Rasmussen]

On Mon, Jan 06, 2020 at 03:31:24PM +0100, Dietmar Eggemann wrote:
> Your issue is related to the 'numa mask check for scheduler MC
> selection' functionality.  It was introduced by commit 37c3ec2d810f and
> re-introduced by commit e67ecf647020 later. I don't know why we need
> this functionality?

That functionality is to ensure that we don't break the sched_domain
hierarchy for numa-in-cluster systems. We have to be sure that the MC
domain is always smaller or equal to the NUMA node span.

Morten