Re: [PATCH v4 1/5] tracing: Introduce faultable tracepoints

[Paul E. McKenney]

On Tue, Nov 21, 2023 at 09:44:44AM -0500, Steven Rostedt wrote:
> On Tue, 21 Nov 2023 15:36:47 +0100
> Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> > 
> > Still utterly confused about what task-tracing rcu is and how it is
> > different from preemptible rcu.
> 
> Is this similar to synchronize_rcu_tasks()? As I understand that one (grace
> period continues until all tasks have voluntarily scheduled or gone into
> user space). But I'm a bit confused by synchronize_rcu_tasks_trace()?
> 
> Note, that for syncronize_rcu_tasks() the critical sections must not call
> schedule (although it is OK to be preempted).

The synchronize_rcu_tasks() and synchronize_rcu_tasks_trace() functions
are quite different, as noted elsewhere in this thread.

							Thanx, Paul