linux-kernel - Re: [PATCH tip/core/rcu 10/86] rcu: eliminate unused boosting statistics

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Date:	Mon, 2 May 2011 09:15:46 -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,
	patches@...aro.org, "Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH tip/core/rcu 10/86] rcu: eliminate unused boosting
 statistics

On Mon, May 02, 2011 at 01:25:55AM -0700, Paul E. McKenney wrote:
> On Sun, May 01, 2011 at 08:53:18AM -0700, Josh Triplett wrote:
> > On Sun, May 01, 2011 at 06:20:50AM -0700, Paul E. McKenney wrote:
> > > From: Paul E. McKenney <paul.mckenney@...aro.org>
> > > 
> > > The n_rcu_torture_boost_allocerror and n_rcu_torture_boost_afferror
> > > statistics are not actually incremented anymore, so eliminate them.
> > > 
> > > 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, 1 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
> > > index 4d256db..62ec8ee6 100644
> > > --- a/kernel/rcutorture.c
> > > +++ b/kernel/rcutorture.c
> > > @@ -1067,7 +1067,7 @@ rcu_torture_printk(char *page)
> > >  	cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG);
> > >  	cnt += sprintf(&page[cnt],
> > >  		       "rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d "
> > > -		       "rtmbe: %d rtbke: %ld rtbre: %ld rtbae: %ld rtbafe: %ld "
> > > +		       "rtmbe: %d rtbke: %ld rtbre: %ld "
> > >  		       "rtbf: %ld rtb: %ld nt: %ld",
> > >  		       rcu_torture_current,
> > >  		       rcu_torture_current_version,
> > > @@ -1078,8 +1078,6 @@ rcu_torture_printk(char *page)
> > >  		       atomic_read(&n_rcu_torture_mberror),
> > >  		       n_rcu_torture_boost_ktrerror,
> > >  		       n_rcu_torture_boost_rterror,
> > > -		       n_rcu_torture_boost_allocerror,
> > > -		       n_rcu_torture_boost_afferror,
> > >  		       n_rcu_torture_boost_failure,
> > >  		       n_rcu_torture_boosts,
> > >  		       n_rcu_torture_timers);
> > 
> > Shouldn't you eliminate the variables entirely, if they no longer track
> > anything?
> 
> I most certainly should!!!  Good catch!!!

And here is the updated commit.

							Thanx, Paul

------------------------------------------------------------------------

rcu: eliminate unused boosting statistics

The n_rcu_torture_boost_allocerror and n_rcu_torture_boost_afferror
statistics are not actually incremented anymore, so eliminate them.

Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@...htriplett.org>

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 4d256db..22b0e74 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -146,8 +146,6 @@ static atomic_t n_rcu_torture_mberror;
 static atomic_t n_rcu_torture_error;
 static long n_rcu_torture_boost_ktrerror;
 static long n_rcu_torture_boost_rterror;
-static long n_rcu_torture_boost_allocerror;
-static long n_rcu_torture_boost_afferror;
 static long n_rcu_torture_boost_failure;
 static long n_rcu_torture_boosts;
 static long n_rcu_torture_timers;
@@ -1067,7 +1065,7 @@ rcu_torture_printk(char *page)
 	cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG);
 	cnt += sprintf(&page[cnt],
 		       "rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d "
-		       "rtmbe: %d rtbke: %ld rtbre: %ld rtbae: %ld rtbafe: %ld "
+		       "rtmbe: %d rtbke: %ld rtbre: %ld "
 		       "rtbf: %ld rtb: %ld nt: %ld",
 		       rcu_torture_current,
 		       rcu_torture_current_version,
@@ -1078,16 +1076,12 @@ rcu_torture_printk(char *page)
 		       atomic_read(&n_rcu_torture_mberror),
 		       n_rcu_torture_boost_ktrerror,
 		       n_rcu_torture_boost_rterror,
-		       n_rcu_torture_boost_allocerror,
-		       n_rcu_torture_boost_afferror,
 		       n_rcu_torture_boost_failure,
 		       n_rcu_torture_boosts,
 		       n_rcu_torture_timers);
 	if (atomic_read(&n_rcu_torture_mberror) != 0 ||
 	    n_rcu_torture_boost_ktrerror != 0 ||
 	    n_rcu_torture_boost_rterror != 0 ||
-	    n_rcu_torture_boost_allocerror != 0 ||
-	    n_rcu_torture_boost_afferror != 0 ||
 	    n_rcu_torture_boost_failure != 0)
 		cnt += sprintf(&page[cnt], " !!!");
 	cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG);
@@ -1486,8 +1480,6 @@ rcu_torture_init(void)
 	atomic_set(&n_rcu_torture_error, 0);
 	n_rcu_torture_boost_ktrerror = 0;
 	n_rcu_torture_boost_rterror = 0;
-	n_rcu_torture_boost_allocerror = 0;
-	n_rcu_torture_boost_afferror = 0;
 	n_rcu_torture_boost_failure = 0;
 	n_rcu_torture_boosts = 0;
 	for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
--
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