Re: [RFC PATCH v2] membarrier: expedited private command

[Peter Zijlstra]

On Sat, Jul 29, 2017 at 07:48:56PM +1000, Nicholas Piggin wrote:
> On Sat, 29 Jul 2017 19:45:43 +1000
> Nicholas Piggin <npiggin@xxxxxxxxx> wrote:
> 
> > hmm, we might be able to restrict iteration
> > to mm_cpumask(current->mm), no? 
> 
> Oh that's been discussed too. I'll read back over it too.

Right, the main problem is that some architectures (arm64 for instance,
although Will is looking at it) don't use mm_cpumask() at all.

Other architectures (PPC for instance) only ever set bits.