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.
Date: Fri, 12 Jul 2013 12:31:17 +0200 [thread overview]
Message-ID: <20130712103117.GA14862@gmail.com> (raw)
In-Reply-To: <20130710154029.GB11309@redhat.com>
* 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
next prev parent reply other threads:[~2013-07-12 10:31 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-04 1:55 scheduling while atomic & hang Dave Jones
2013-07-04 2:49 ` Linus Torvalds
2013-07-04 4:43 ` H. Peter Anvin
2013-07-04 7:49 ` Dave Jones
2013-07-04 17:22 ` Linus Torvalds
2013-07-10 20:54 ` J. Bruce Fields
2013-07-04 18:08 ` H. Peter Anvin
2013-07-05 6:51 ` Ingo Molnar
2013-07-05 7:19 ` Frederic Weisbecker
2013-07-05 10:05 ` Ingo Molnar
2013-07-05 19:27 ` Linus Torvalds
2013-07-06 8:02 ` Frederic Weisbecker
2013-07-06 8:07 ` Ingo Molnar
2013-07-05 14:38 ` Yet more softlockups Dave Jones
2013-07-05 15:15 ` Thomas Gleixner
2013-07-05 16:00 ` Dave Jones
2013-07-05 16:02 ` Thomas Gleixner
2013-07-05 16:41 ` H. Peter Anvin
2013-07-05 18:20 ` Seiji Aguchi
2013-07-05 22:21 ` Thomas Gleixner
2013-07-06 7:24 ` Ingo Molnar
2013-07-07 0:24 ` Dave Jones
2013-07-10 15:13 ` Dave Jones
2013-07-10 15:20 ` Markus Trippelsdorf
2013-07-10 15:40 ` Dave Jones
2013-07-12 10:31 ` Ingo Molnar [this message]
2013-07-12 15:38 ` Dave Hansen
2013-07-12 15:45 ` Dave Jones
2013-07-12 15:55 ` Dave Hansen
2013-07-12 17:00 ` Dave Jones
2013-07-12 17:12 ` David Ahern
2013-07-12 17:18 ` Dave Jones
2013-07-12 17:40 ` David Ahern
2013-07-12 17:50 ` Dave Jones
2013-07-12 18:07 ` David Ahern
2013-07-12 18:22 ` Dave Hansen
2013-07-12 20:13 ` Dave Hansen
2013-07-13 1:40 ` Vince Weaver
2013-07-10 15:39 ` Vince Weaver
2013-07-10 15:45 ` Dave Jones
2013-07-10 21:54 ` Dave Jones
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