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Date: Fri, 12 Jul 2013 12:31:17 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Dave Jones <davej@redhat.com>,
        Markus Trippelsdorf <markus@trippelsdorf.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Peter Anvin <hpa@zytor.com>, Peter Zijlstra <peterz@infradead.org>,
        Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: Yet more softlockups.
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* Dave Jones <davej@redhat.com> wrote:

> On Wed, Jul 10, 2013 at 05:20:15PM +0200, Markus Trippelsdorf wrote:
>  > On 2013.07.10 at 11:13 -0400, Dave Jones wrote:
>  > > I get this right after booting..
>  > > 
>  > > [  114.516619] perf samples too long (4262 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
>  > 
>  > You can disable this warning by:
>  > 
>  > echo 0 > /proc/sys/kernel/perf_cpu_time_max_percent
> 
> Yes, but why is this even being run when I'm not running perf ?
> 
> The only NMI source running should be the watchdog.

The NMI watchdog is a perf event.

I've Cc:-ed Dave Hansen, the author of those changes - is this a false 
positive or some real problem?

Thanks,

	Ingo