[tip/core/rcu,1/5] rcu: Update rcutorture defaults

Message ID 1346352312-31987-1-git-send-email-paulmck@linux.vnet.ibm.com
State New
Headers show

Commit Message

Paul E. McKenney Aug. 30, 2012, 6:45 p.m.
From: "Paul E. McKenney" <paul.mckenney@linaro.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@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/rcutorture.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

Comments

Josh Triplett Aug. 30, 2012, 6:57 p.m. | #1
On Thu, Aug 30, 2012 at 11:45:08AM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paul.mckenney@linaro.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@linaro.org>
> Signed-off-by: Paul E. McKenney <paulmck@linux.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@us.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.

>  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/

>  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
>
Paul E. McKenney Aug. 30, 2012, 9:35 p.m. | #2
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@linaro.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@linaro.org>
> > Signed-off-by: Paul E. McKenney <paulmck@linux.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@us.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
> > 
>
Josh Triplett Aug. 30, 2012, 11:24 p.m. | #3
On Thu, Aug 30, 2012 at 02:35:36PM -0700, Paul E. McKenney wrote:
> 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@linaro.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@linaro.org>
> > > Signed-off-by: Paul E. McKenney <paulmck@linux.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@us.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".

Good point, you definitely still need to document what zero means.

> > >  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!

With those two fixes:

Reviewed-by: Josh Triplett <josh@joshtriplett.org>

Patch

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@us.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". */
 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. */
 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). */