linux-kernel - Re: [PATCH tip/core/rcu 20/45] torture: Include "Stopping" string to torture_kthread

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Date:	Fri, 9 May 2014 17:16:57 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 20/45] torture: Include "Stopping" string to
 torture_kthread_stopping()

On Fri, May 09, 2014 at 05:13:46PM -0700, Paul E. McKenney wrote:
> On Wed, May 07, 2014 at 02:37:36PM -0700, josh@...htriplett.org wrote:
> > On Mon, Apr 28, 2014 at 05:25:08PM -0700, Paul E. McKenney wrote:
> > > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > > 
> > > Currently, torture_kthread_stopping() prints only the name of the
> > > kthread that is stopping, which can be unedifying.  This commit therefore
> > > adds "Stopping" to make things more evident.
> > > 
> > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > Feedback below.
> > 
> > >  kernel/torture.c | 5 ++++-
> > >  1 file changed, 4 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/kernel/torture.c b/kernel/torture.c
> > > index acc9afc2f26e..f329848c3eee 100644
> > > --- a/kernel/torture.c
> > > +++ b/kernel/torture.c
> > > @@ -674,8 +674,11 @@ EXPORT_SYMBOL_GPL(torture_must_stop_irq);
> > >   */
> > >  void torture_kthread_stopping(char *title)
> > >  {
> > > +	char buf[128];
> > > +
> > > +	snprintf(buf, sizeof(buf), "Stopping %s", title);
> > >  	if (verbose)
> > > -		VERBOSE_TOROUT_STRING(title);
> > > +		VERBOSE_TOROUT_STRING(buf);
> > 
> > This seems like a case where the macro has led to poorer code; rather
> > than using sprintf into a temporary buffer, this should just print.
> > Please consider fixing the output macros to allow formats, as the pr_*
> > macros do.
> > 
> > Also, why do you need "if (verbose)" if the name of the macro has
> > VERBOSE_ in it; shouldn't that mean it checks verbosity itself?
> > (Another good reason not to create a unique verbosity level mechanism,
> > and to use the kernel mechanisms instead.)
> 
> Good catch, removed the redundant "if (verbose)".
> 
> My attempts in the past to leverage existing in-kernel verbosity controls
> has caused problems such as the output appearing or not depending on
> the distro in question.

That aside, though, what do you think about making the macros accept
format strings and arguments, in the style of pr_* and pr_fmt?

- Josh Trpilett
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