Re: [PATCH v2] EXP rcu: Move expedited grace period (GP) work to RT kthread_worker

[Steven Rostedt]

On Fri, 8 Apr 2022 08:58:34 -0700
"Paul E. McKenney" <paulmck@xxxxxxxxxx> wrote:

> > I do not see why PREEMPT_RT is special here. Why was it singled out?  
> 
> Because I didn't see the point of doing kthread_create_worker() to create
> a pair of kthread_worker structuress that were never going to be used
> in PREEMPT_RT kernels.
> 
> Or are PREEMPT_RT kernels no longer booting with rcupdate.rcu_normal?
> Last I knew, they all did this to avoid IPI latencies from expedited
> grace periods.  Has this changed?

Honestly, I don't know. But I guess I can go and find out ;-)

-- Steve