From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 23 May 2007 20:57:37 +0000 (-0700)
Subject: NOHZ: Rate limit the local softirq pending warning output
X-Git-Tag: v2.6.22-rc3~73
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=352823160613b65fdaa558be486720a71f75ed86;p=linux-2.6

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@linutronix.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 3483e6cb95..3e7ebc4646 100644
--- a/kernel/time/tick-sched.c
+++ b/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();
 	/*