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

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Date:	Mon, 21 May 2007 21:58:55 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	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, akpm@...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 12:16 -0700, Chris Wright wrote:
> plain text document attachment
> (i386-hpet-check-if-the-counter-works.patch)
> -stable review patch.  If anyone has any objections, please let us know.
> ---------------------
> 
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> Some systems have a HPET which is not incrementing, which leads to a
> complete hang. Detect it during HPET setup.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Chris Wright <chrisw@...s-sol.org>
> ---
> [chrisw: Why is this not upstream yet?]

Dunno. There is another one missing:

------------------------------->
Subject: NOHZ: Rate limit the local softirq pending warning output

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++;
+		}
+	}
 
 	now = ktime_get();
 	/*


-
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