Re: [v7 0/8] Reduce cross CPU IPI interference

[Paul E. McKenney]

On Thu, Feb 02, 2012 at 11:34:25AM +0200, Avi Kivity wrote:
> On 02/01/2012 10:13 PM, Paul E. McKenney wrote:
> > > 
> > > Could we also apply the same approach to processors busy doing
> > > computational work? In that case the OS is also not needed. Interrupting
> > > these activities is impacting on performance and latency.
> >
> > Yep, that is in fact what Frederic's dyntick-idle userspace work does.
> 
> Running in a guest is a special case of running in userspace, so we'd
> need to extend this work to kvm as well.

As long as rcu_idle_enter() is called at the appropriate time, RCU will
happily ignore the CPU.  ;-)

							Thanx, Paul

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