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

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Message-ID: <0dc1bec4-ed35-4852-a15b-781041d26df9@nvidia.com>
Date: Sat, 5 Apr 2025 07:01:13 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: paulmck@...nel.org
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 4/2/2025 3:17 PM, Paul E. McKenney wrote:
> 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.
Ok, thanks. If you could repost whenever it is ready to the list, I'll pull it.

Also I'm guessing that checkpatch one does not need any changes, but we've to
add a reminder to revert it in the future.

thanks,

- Joel