From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: John Stultz <john.stultz@linaro.org>
Cc: "Ross Green" <rgkernel@gmail.com>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Peter Zijlstra" <peterz@infradead.org>,
lkml <linux-kernel@vger.kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Lai Jiangshan" <jiangshanlai@gmail.com>,
dipankar@in.ibm.com, "Andrew Morton" <akpm@linux-foundation.org>,
"Josh Triplett" <josh@joshtriplett.org>,
rostedt <rostedt@goodmis.org>,
"David Howells" <dhowells@redhat.com>,
"Eric Dumazet" <edumazet@google.com>,
"Darren Hart" <dvhart@linux.intel.com>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Oleg Nesterov" <oleg@redhat.com>,
"pranith kumar" <bobby.prani@gmail.com>
Subject: Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17
Date: Fri, 19 Feb 2016 09:33:43 -0800 [thread overview]
Message-ID: <20160219173343.GB3522@linux.vnet.ibm.com> (raw)
In-Reply-To: <CALAqxLXrGB8yiP469yGBHTBbX3+4p-qC0QNPoqq+q_ju0Nq+vQ@mail.gmail.com>
On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stultz wrote:
> On Thu, Feb 18, 2016 at 7:56 PM, Ross Green <rgkernel@gmail.com> wrote:
> > Well a bonus extra!
> > Kept everything running and there was another stall.
> > So i have included the demsg output for perusal.
> >
> > Just to clear things up there is no hotplug involved in this system.
> > It is a standard Pandaboard ES Ti4460 two processor system.
> > I use this for testing as a generic armv7 processor, plus can keep it
> > just running along for testing for a long time. the system has a total
> > of 23-25 process running on average. Mainly standard daemons. There is
> > certainly no heavy processing going on. I run a series of benchmarks
> > that are cpu intensive for the first 20 miinutes after boot and then
> > just leave it idle away. checking every so often to see how it has
> > gone.
> > As mentioned I have observed these stalls going back to 3.17 kernel.
> > It will often take up to a week to record such a stall. I will
> > typically test every new release kernel, so the -rc? series will get
> > around a weeks testing.
>
> Sorry. Kind of hopping in a bit late here. Is this always happening
> with just the pandaboard? Or are you seeing this on different
> machines?
>
> Have you tried enabling CONFIG_DEBUG_TIMEKEEPING just in case
> something is going awry there?
Excellent point -- timekeeping issues have caused this sort of issue
in the past.
Ross, on your next test, could you please enable CONFIG_DEBUG_TIMEKEEPING
as John suggests?
Thanx, Paul
next prev parent reply other threads:[~2016-02-19 17:34 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 10:11 rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17 Ross Green
2016-02-17 5:45 ` Paul E. McKenney
2016-02-17 19:28 ` Paul E. McKenney
2016-02-17 19:45 ` Peter Zijlstra
2016-02-17 20:28 ` Paul E. McKenney
2016-02-17 23:19 ` Paul E. McKenney
2016-02-18 11:51 ` Ross Green
2016-02-18 23:14 ` Mathieu Desnoyers
2016-02-19 3:56 ` Ross Green
2016-02-19 4:13 ` John Stultz
2016-02-19 17:33 ` Paul E. McKenney [this message]
2016-02-20 4:34 ` Ross Green
2016-02-20 6:32 ` Paul E. McKenney
2016-02-21 5:04 ` Ross Green
2016-02-21 18:15 ` Ross Green
2016-02-23 20:34 ` Mathieu Desnoyers
2016-02-23 20:55 ` Paul E. McKenney
2016-02-23 21:28 ` Ross Green
2016-02-25 5:13 ` Ross Green
2016-02-26 0:56 ` Paul E. McKenney
2016-02-26 1:35 ` Paul E. McKenney
2016-03-04 5:30 ` Ross Green
2016-03-04 15:18 ` Paul E. McKenney
2016-03-18 21:00 ` Josh Triplett
2016-03-18 23:56 ` Paul E. McKenney
2016-03-21 16:22 ` Jacob Pan
2016-03-21 17:26 ` Paul E. McKenney
2016-03-22 16:35 ` Chatre, Reinette
2016-03-22 17:40 ` Paul E. McKenney
2016-03-22 21:04 ` Chatre, Reinette
2016-03-22 21:19 ` Paul E. McKenney
2016-03-23 17:15 ` Chatre, Reinette
2016-03-23 18:20 ` Paul E. McKenney
2016-03-23 18:25 ` Chatre, Reinette
2016-03-23 19:50 ` Paul E. McKenney
2016-03-25 21:24 ` Chatre, Reinette
2016-03-25 21:46 ` Paul E. McKenney
2016-03-26 12:29 ` Mathieu Desnoyers
2016-03-26 15:28 ` Paul E. McKenney
2016-03-26 18:49 ` Paul E. McKenney
2016-03-26 22:22 ` Mathieu Desnoyers
2016-03-27 1:34 ` Paul E. McKenney
2016-03-27 13:48 ` Mathieu Desnoyers
2016-03-27 15:40 ` Paul E. McKenney
2016-03-27 20:00 ` Paul E. McKenney
2016-03-27 20:45 ` Peter Zijlstra
2016-03-27 21:06 ` Paul E. McKenney
2016-03-28 6:25 ` Peter Zijlstra
2016-03-28 13:08 ` Paul E. McKenney
2016-03-29 0:25 ` Paul E. McKenney
2016-03-29 0:28 ` Paul E. McKenney
2016-03-29 13:49 ` Paul E. McKenney
2016-03-30 14:55 ` Paul E. McKenney
2016-03-31 15:42 ` Paul E. McKenney
2016-04-03 8:18 ` Paul E. McKenney
2016-05-06 6:25 ` Ross Green
2016-05-07 15:25 ` Paul E. McKenney
2016-05-10 2:36 ` Ross Green
2016-06-30 17:52 ` Paul E. McKenney
2016-03-28 1:44 ` Mathieu Desnoyers
2016-03-28 2:23 ` Mathieu Desnoyers
2016-03-28 6:13 ` Peter Zijlstra
2016-03-28 13:50 ` Paul E. McKenney
2016-03-28 14:15 ` Mathieu Desnoyers
2016-03-27 20:53 ` Peter Zijlstra
2016-03-27 21:07 ` Paul E. McKenney
2016-03-27 20:54 ` Peter Zijlstra
2016-03-27 21:09 ` Paul E. McKenney
2016-03-28 6:28 ` Peter Zijlstra
2016-03-28 13:29 ` Paul E. McKenney
2016-03-28 15:07 ` Mathieu Desnoyers
2016-03-28 15:56 ` Paul E. McKenney
2016-03-28 16:12 ` Mathieu Desnoyers
2016-03-28 16:29 ` Paul E. McKenney
2016-03-30 12:58 ` Boqun Feng
2016-03-30 13:30 ` Paul E. McKenney
2016-03-30 14:15 ` Boqun Feng
2016-02-19 4:22 ` Paul E. McKenney
2016-02-19 5:59 ` Ross Green
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