Re: [PATCH v5 tip/core/rcu 15/16] rcu: Make RCU-tasks wait for idle tasks

[Peter Zijlstra]

On Wed, Aug 13, 2014 at 07:43:32AM -0700, Paul E. McKenney wrote:
> So the first three look OK to hook rcu_idle_enter() and rcu_idle_exit()
> into, but the last two don't look so good.
> 
> That said, if you are OK not tracing the stuff under stop_critical_timings(),
> then I can use the RCU dyntick-idle state and not wake anything up.

Either way, Steve could easily whip up a debug thing that could validate
that. Simply WARN whenever an __mcount happens when under rcu_idle.

And if we make these idle functions small enough that should not be a
problem at all.

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