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

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Message-ID: <5da8ff7a10670359647fc8135668be7c.joelagnelf@nvidia.com>
Date: Wed, 02 Apr 2025 12:19:13 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, rcu <rcu@...r.kernel.org>, Joel Fernandes <joelagnelf@...dia.com>, 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

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?

thanks,

 - Joel