linux-kernel - Re: Yet more softlockups.

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Message-ID: <20130710215414.GA25959@redhat.com>
Date:	Wed, 10 Jul 2013 17:54:14 -0400
From:	Dave Jones <davej@...hat.com>
To:	Vince Weaver <vince@...ter.net>
Cc:	Ingo Molnar <mingo@...nel.org>,
	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>
Subject: Re: Yet more softlockups.

On Wed, Jul 10, 2013 at 11:39:50AM -0400, Vince Weaver wrote:
 > On Wed, 10 Jul 2013, Dave Jones wrote:
 > 
 > > Something is really fucked up in the kernel side of perf.
 > > I get this right after booting..
 > > 
 > > [  114.516619] perf samples too long (4262 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
 > > 
 > > That's before I even get a chance to log in, so I'm pretty sure perf isn't even being run.
 > > 
 > > And this is just booting up my desktop, not fuzzing.
 > 
 > This is probably related to the problem described in the thread
 >    perf: fix interrupt handler timing harness
 >    http://comments.gmane.org/gmane.linux.kernel/1520775
 > which in theory has a fix.  Not sure why it'd trigger during boot.

Bah. That's not it either.

[ 1903.293233] perf samples too long (2514 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 1903.295248] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 19498.002 msecs

	Dave


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