linux-kernel - Re: [PATCH tip/core/rcu 1/5] rcu: Update rcutorture defaults

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Message-ID: <20120830213536.GI30381@linux.vnet.ibm.com>
Date:	Thu, 30 Aug 2012 14:35:36 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org,
	"Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH tip/core/rcu 1/5] rcu: Update rcutorture defaults

On Thu, Aug 30, 2012 at 11:57:05AM -0700, Josh Triplett wrote:
> On Thu, Aug 30, 2012 at 11:45:08AM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paul.mckenney@...aro.org>
> > 
> > A number of new features have been added to rcutorture over the years, but
> > the defaults have not been updated to include them.  This commit therefore
> > turns on a couple of them that have proven helpful and trustworthy, namely
> > periodic progress reports and testing of NO_HZ.
> > 
> > Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > ---
> >  kernel/rcutorture.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
> > index 25b1503..86315d3 100644
> > --- a/kernel/rcutorture.c
> > +++ b/kernel/rcutorture.c
> > @@ -53,10 +53,10 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@...ibm.com> and Josh Triplett <josh@fre
> >  
> >  static int nreaders = -1;	/* # reader threads, defaults to 2*ncpus */
> >  static int nfakewriters = 4;	/* # fake writer threads */
> > -static int stat_interval;	/* Interval between stats, in seconds. */
> > +static int stat_interval = 60;	/* Interval between stats, in seconds. */
> >  				/*  Defaults to "only at end of test". */
> 
> Need to remove this comment about the default.

Good catch!  I have replaced it with "Zero means "only at end of test".

> >  static bool verbose;		/* Print more debug info. */
> > -static bool test_no_idle_hz;	/* Test RCU's support for tickless idle CPUs. */
> > +static bool test_no_idle_hz = 1; /* Test RCU support for tickless idle CPUs. */
> 
> s/1/true/

Good point, fixed.

Thank you for looking this over!

							Thanx, Paul

> >  static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/
> >  static int stutter = 5;		/* Start/stop testing interval (in sec) */
> >  static int irqreader = 1;	/* RCU readers from irq (timers). */
> > -- 
> > 1.7.8
> > 
> 

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