Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads

Peter Zijlstra
2012-06-14T14:56:37Z

On Thu, 2012-06-14 at 07:47 -0700, Paul E. McKenney wrote:
> RCU callback processing consumes the entire CPU in RCU_BOOST case where
> processing runs at real-time priority. This is analogous to RT throttling
> in the scheduler.

But previously we can in non-preemptible softirq context, why would if
behave differently when done from a RT task?

Also, no its not quite like the throttling, that really idles the cpu
even if there's no SCHED_OTHER tasks to run.