Re: [PATCH tip/core/rcu 4/5] sys_membarrier: Add expedited option

[Paul E. McKenney]

On Thu, Jul 27, 2017 at 04:36:24PM +0200, Peter Zijlstra wrote:
> On Thu, Jul 27, 2017 at 07:32:05AM -0700, Paul E. McKenney wrote:
> > > as per your proposed patch, will spray IPIs to all CPUs and at high
> > > rates.
> > 
> > OK, I have updated my patch to do throttling.
> 
> But not respect cpusets. Which is the other important point.
> 
> The scheduler based IPIs are limited to where we are allowed to place
> tasks (as are the TLB ones for that matter, for the exact same reason).

Yes, these are disadvantages, no argument there.  But I will nevertheless
be carrying some variant of this patch until something better exists,
including that something being tested and found satisfactory by the
various people asking for this.

							Thanx, Paul