Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait ornmi

[Peter Zijlstra]

On Tue, 2012-06-05 at 15:12 -0700, Paul E. McKenney wrote:
> > What I can't see is the isolated functional, aside from the above
> > mentioned things, that's not strictly a per-cpu property, we can have a
> > group that's isolated from the rest but not from each other.
> 
> I suspect that Thomas is thinking that the CPU is so idle that it no
> longer has to participate in TLB invalidation or RCU.  (Thomas will
> correct me if I am confused.)  But Peter, is that the level of idle
> you are thinking of? 

No, we're talking about isolated, so its very much running something.
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