Re: [tip:perf/core] perf: Per-pmu-per-cpu contexts

[Peter Zijlstra]

On Fri, 2010-09-10 at 08:37 -0700, Paul E. McKenney wrote:
> > So, you say below that it works because synchronize_srcu(), that
> > waits for qs after touching pmus, implies synchronize_sched(), right?
> 
> Ook...  My current plans to fold SRCU into TREE_RCU would invalidate
> this assumption.
> 
> Maybe we need some sort of primitive that concurrently waits for
> multiple types of RCU grace periods? 

Nah, but I was thinking that any kind of preemptible rcu sync would
imply a sched rcu sync.

If not strictly implied I'd have no problem simply writing:

  synchronize_rcu_sched();
  synchronize_srcu();


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