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

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Date:	Tue, 22 May 2007 00:12:32 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chris Wright <chrisw@...s-sol.org>, linux-kernel@...r.kernel.org,
	stable@...nel.org, Andi Kleen <ak@...e.de>,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	torvalds@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	guilherme@...tralinf.com.br, johnstul@...ibm.com
Subject: Re: [patch 43/69] i386: HPET, check if the counter works

On Mon, 2007-05-21 at 14:57 -0700, Andrew Morton wrote:
> On Mon, 21 May 2007 21:58:55 +0200
> Thomas Gleixner <tglx@...utronix.de> 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@...utronix.de>
> > 
> > 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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