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From:   Junchang Wang <junchangwang@gmail.com>
Date:   Wed, 2 Jan 2019 11:48:00 +0800
Message-ID: <CABoNC82px+072c2eKWcpjMyJX-m8Dh4=L0W6Wxw5Q+HeXoK2Pg@mail.gmail.com>
Subject: Re: [PATCH 2/2] torture.txt: update the list of supported torture types
To:     Paul McKenney <paulmck@linux.ibm.com>
Cc:     dave@stgolabs.net, josh@joshtriplett.org,
        Jonathan Corbet <corbet@lwn.net>, rostedt@goodmis.org,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        jiangshanlai@gmail.com, joel@joelfernandes.org,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-doc@vger.kernel.org
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On Wed, Jan 2, 2019 at 1:54 AM Paul E. McKenney <paulmck@linux.ibm.com> wrote:
>
> On Tue, Jan 01, 2019 at 10:03:20PM +0800, Junchang Wang wrote:
> > Torture types "rcu_bh" and "sched" were removed in commit "c770c82a23".
> > The name of torture type "rcu_busted" was changed to "busted" in commit
> > "b3c983142d". Two other types, "srcud" and "busted_srcud" were added in
> > commits "ca1d51ed98" and "2397d072f7", respectively. This patch updates
> > torture.txt accordingly.
> >
> > Signed-off-by: Junchang Wang <junchangwang@gmail.com>
>
> Given that this section of this file duplicates the rcutorture kernel boot
> parameters called out in Documentation/admin-guide/kernel-parameters.txt,
> perhaps the best way forward is to instead remove this information from
> Documentation/RCU/torture.txt in favor of a reference to the information
> (with search string) in Documentation/admin-guide/kernel-parameters.txt.
>
> Thoughts?

Hi Paul,

Thanks for the comment; indeed the section "MODULE PARAMETERS" in
torture.txt duplicates the corresponding sections in
kernel-parameters.txt. I can resubmit a patch that (1) removes the
section "MODULE PARAMETERS" in torture.txt, and (2) add a single
sentence saying "Module parameters are detailed in
Documentation/admin-guide/kernel-parameters.txt". Does that sound
good?

Thanks,
--Junchang

>
>                                                         Thanx, Paul
>
> > ---
> >  Documentation/RCU/torture.txt | 15 +++++++--------
> >  1 file changed, 7 insertions(+), 8 deletions(-)
> >
> > diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
> > index 55918b5..6395f0b 100644
> > --- a/Documentation/RCU/torture.txt
> > +++ b/Documentation/RCU/torture.txt
> > @@ -155,20 +155,19 @@ torture_type    The type of RCU to test, with string values as follows:
> >                       along with expedited, synchronous, and polling
> >                       variants.
> >
> > -             "rcu_bh": rcu_read_lock_bh(), rcu_read_unlock_bh(), and
> > -                     call_rcu_bh(), along with expedited and synchronous
> > -                     variants.
> > -
> > -             "rcu_busted": This tests an intentionally incorrect version
> > +             "busted": This tests an intentionally incorrect version
> >                       of RCU in order to help test rcutorture itself.
> >
> >               "srcu": srcu_read_lock(), srcu_read_unlock() and
> >                       call_srcu(), along with expedited and
> >                       synchronous variants.
> >
> > -             "sched": preempt_disable(), preempt_enable(), and
> > -                     call_rcu_sched(), along with expedited,
> > -                     synchronous, and polling variants.
> > +             "srcud": A second form of srcu that dynamically allocates
> > +                     and frees srcu_struct to test srcu cleanup code path.
> > +
> > +             "busted_srcud": This torture type verifies rcutorture's ability
> > +                     to detect extensions of RCU read-side critical sections
> > +                     that are not handled.
> >
> >               "tasks": voluntary context switch and call_rcu_tasks(),
> >                       along with expedited and synchronous variants.
> > --
> > 2.7.4
> >
>