linux-kernel - Re: Typical PREEMPT

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Date:   Tue, 5 Apr 2022 07:57:28 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     bigeasy@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: Typical PREEMPT_RT .config?

On Tue, Apr 05, 2022 at 09:42:02AM -0400, Steven Rostedt wrote:
> On Tue, 5 Apr 2022 09:40:48 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Mon, 4 Apr 2022 16:16:54 -0700
> > "Paul E. McKenney" <paulmck@...nel.org> wrote:
> > 
> > > OK, now that PREEMPT_RT is mostly into mainline, I should probably create
> > > an rcutorture scenario more closely reflecting it.  The closest at the
> > > moment is probably tools/testing/selftests/rcutorture/configs/rcu/TREE03,
> > > but I figured that before beating on it I should check to see if you
> > > already have a PREEMPT_RT rcutorture scenario file.  
> > 
> > I don't have one.
> 
> And now reading the subject line and not just the body, are you asking
> about what configs are normally added? I had several I used for testing,
> but will have to go back and look at them.

That would be great!  I can easily add CONFIG_PREEMPT_RT=y.  Maybe I also
should add CONFIG_RT_DELAYED_SIGNALS, though rcutorture probably doesn't
care about this one.  Maybe threaded interrupts happen automatically?
Sleeping spinlocks?

If no advice is forthcoming, I will make something up based on my best
guesses, but I guarantee you that this will result in me missing important
bugs in my testing.  ;-)

So it would be great to have a list of the Kconfig options normally
selected when building CONFIG_PREEMPT_RT=y kernels.

							Thanx, Paul