linux-kernel - Re: Yet more softlockups.

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Message-ID: <20130705160043.GF325@redhat.com>
Date:	Fri, 5 Jul 2013 12:00:43 -0400
From:	Dave Jones <davej@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Yet more softlockups.

On Fri, Jul 05, 2013 at 05:15:07PM +0200, Thomas Gleixner wrote:
 > On Fri, 5 Jul 2013, Dave Jones wrote:
 > 
 > > BUG: soft lockup - CPU#3 stuck for 23s! [trinity-child1:14565]
 > > perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
 > > INFO: NMI handler (perf_event_nmi_handler) took too long to run: 238147.002 msecs
 > 
 > So we see a softlockup of 23 seconds and the perf_event_nmi_handler
 > claims it did run 23.8 seconds.
 > 
 > Are there more instances of NMI handler messages ?

[ 2552.006181] perf samples too long (2511 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 2552.008680] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 500392.002 msecs

	Dave

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