Re: [PATCH v3 tip/core/rcu 3/9] rcu: Add synchronous grace-period waiting for RCU-tasks

[Steven Rostedt]

On Fri, 8 Aug 2014 09:39:05 -0700
"Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:


> Unless this is done in idle, at which point RCU-sched is studiously
> ignoring any preempt_disable() sections.

ftrace doesn't use synchronize_sched() today because of this. It
instead just does a "schedule_on_each_cpu()" and waits for that to
return before going further.

-- Steve
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