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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>
This commit is contained in:
Thomas Gleixner 2007-05-23 13:57:37 -07:00 committed by Linus Torvalds
parent 43d4f961a8
commit 3528231606
1 changed files with 9 additions and 3 deletions
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12
kernel/time/tick-sched.c
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@ -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();
/*