From: David Ahern <dsahern@gmail.com>
To: Dave Jones <davej@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
Ingo Molnar <mingo@kernel.org>,
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 12:07:28 -0600 [thread overview]
Message-ID: <51E045E0.8020702@gmail.com> (raw)
In-Reply-To: <20130712175028.GA11036@redhat.com>
On 7/12/13 11:50 AM, Dave Jones wrote:
> Given you can run trinity long enough that you hit this however, makes me
> think you won't be able to triger the bug I'm talking about.
> Perhaps virtualised perf counters are somehow immune to this problem, because
> on bare-metal, it literally takes seconds.
I can generate the message it just does not lock up:
...
[ 131.837129] perf samples too long (35849 > 35714), lowering
kernel.perf_event_max_sample_rate to 4000
...
[ 237.271170] INFO: NMI handler (perf_event_nmi_handler) took too long
to run: 57900.001 msecs
And Dave Hansen: I think nmi.c has the same do_div problem as
kernel/events/core.c that Stephane fixed. Your patch has:
whole_msecs = do_div(delta, (1000 * 1000));
decimal_msecs = do_div(delta, 1000) % 1000;
David
next prev parent reply other threads:[~2013-07-12 18:07 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
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 [this message]
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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