Re: [patch 43/69] i386: HPET, check if the counter works

[Thomas Gleixner]

On Mon, 2007-05-21 at 14:57 -0700, Andrew Morton wrote:
> On Mon, 21 May 2007 21:58:55 +0200
> Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> 
> > The warning in the NOHZ code, which triggers when a CPU goes idle with
> > softirqs pending can fill up the logs quite quickly. Rate limit the
> > output until we found the root cause of that problem.
> > 
> > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > 
> > Index: linux-2.6.21/kernel/time/tick-sched.c
> > ===================================================================
> > --- linux-2.6.21.orig/kernel/time/tick-sched.c
> > +++ linux-2.6.21/kernel/time/tick-sched.c
> > @@ -167,9 +167,15 @@ void tick_nohz_stop_sched_tick(void)
> >  		goto end;
> >  
> >  	cpu = smp_processor_id();
> > -	if (unlikely(local_softirq_pending()))
> > -		printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
> > -		       local_softirq_pending());
> > +	if (unlikely(local_softirq_pending())) {
> > +		static int ratelimit;
> > +
> > +		if (ratelimit < 10) {
> > +			printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
> > +			       local_softirq_pending());
> > +			ratelimit++;
> > +		}
> > +	}
> 
> that's not a "rate" limit.  I resist the temptation to rename it to "limit"
> to keep mainline and -stable in sync, and coz it's temporary (we hope).

Point taken.

	tglx


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