linux-kernel - Re: [v2,04/12] rcutorture: Make torture.sh --do-rt use CONFIG_PREEMPT

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Message-ID: <72693320-1863-4e47-941f-0e887f87a855@paulmck-laptop>
Date: Wed, 2 Apr 2025 12:17:34 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	rcu <rcu@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...a.com>, rostedt <rostedt@...dmis.org>
Subject: Re: [v2,04/12] rcutorture: Make torture.sh --do-rt use
 CONFIG_PREEMPT_RT

On Wed, Apr 02, 2025 at 12:19:13PM -0400, Joel Fernandes wrote:
> Hello,
> 
> On Wed, 2 Apr 2025 16:17:06 GMT, Sebastian Andrzej Siewior wrote:
> > On 2025-03-31 14:03:06 [-0700], Paul E. McKenney wrote:
> > > The torture.sh --do-rt command-line parameter is intended to mimic -rt
> > > kernels.  Now that CONFIG_PREEMPT_RT is upstream, this commit makes this
> > > mimicking more precise.
> > > 
> > > Note that testing of RCU priority boosting is disabled in favor
> > > of forward-progress testing of RCU callbacks.  If it turns out to be
> > > possible to make kernels built with CONFIG_PREEMPT_RT=y to tolerate
> > > testing of both, both will be enabled.
> > 
> > Not sure what you point at here: You can build a PREEMPT_RT kernel and
> > RCU boosting is enabled by default. You could disable it if needed.
> 
> Yeah, RCU_BOOST has default y if PREEMPT_RT.
> 
> Paul, should we be disabling it in the --do-rt script?

You should have a "rcutorture.test_boost=0" from f2ac55968df2
("rcutorture: Make torture.sh --do-rt use CONFIG_PREEMPT_RT").

Plus I just now made additional adjustments based on Sebastian Siewior's
feedback.  He is likely to have additional feedback, so this is currently
a "squash!" commit in my tree.

							Thanx, Paul