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

[Andrew Morton <akpm@linux-foundation.org>]

On Mon, 21 May 2007 21:58:55 +0200
Thomas Gleixner <tglx@linutronix.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@linutronix.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).
-
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