linux-kernel - Re: Yet more softlockups.

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Message-ID: <20130712103117.GA14862@gmail.com>
Date:	Fri, 12 Jul 2013 12:31:17 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Jones <davej@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Peter Anvin <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: Yet more softlockups.


* Dave Jones <davej@...hat.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
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