Re: [PATCH 4/4] sched/topology: the group balance cpu must be a cpu where the group is installed

[Peter Zijlstra]

On Tue, Apr 25, 2017 at 05:22:36PM +0200, Peter Zijlstra wrote:
> On Tue, Apr 25, 2017 at 05:12:00PM +0200, Peter Zijlstra wrote:
> > But I'll first try and figure out why I'm not having empty masks.
> 
> Ah, so this is before all the degenerate stuff, so there's a bunch of
> redundant domains below that make it work -- and there always will be,
> unless FORCE_SD_OVERLAP.
> 
> Now I wonder what triggered it.. let me put it back.

Ah! the asymmetric setup, where @sibling is entirely uninitialized for
the top domain.