From: Vince Weaver <vincent.weaver@maine.edu>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Peter Zijlstra <peterz@infradead.org>,
Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: x86_pmu_start WARN_ON.
Date: Thu, 20 Feb 2014 14:46:17 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.10.1402201438480.24360@vincent-weaver-1.um.maine.edu> (raw)
In-Reply-To: <alpine.DEB.2.10.1402201414380.24360@vincent-weaver-1.um.maine.edu>
On Thu, 20 Feb 2014, Vince Weaver wrote:
> On Thu, 20 Feb 2014, Vince Weaver wrote:
>
> > Might be relevant: check the last_cpu values. Right before the above
> > it looks like the thread gets moved from CPU 1 to CPU 0
> > (possibly as a result of the long chain started with the
> > close() of the tracepoint event),
> > so the problem NMI watchdog event being enabled is a different one than
> > the one that was disabled just before.
>
> so is this a false warning? If you get scheduled to a new CPU
> and there's an already running CPU-wide event, is that OK?
>
> Or should x86_pmu_disable() be setting PERF_HES_STOPPED on all events?
> It looks like other architectures are (such as armpmu_stop() ).
an actually I take that back, other architectures don't.
It's just confusing how
perf_pmu_disable()
calls
pmu->pmu_disable()
which on arm is:
armpmu_disable()
which calls:
armpmu->stop()
which is *not* the same as:
armpmu_stop()
but is actually armpmu->pmu->stop()
Urgh.
Vince
next prev parent reply other threads:[~2014-02-20 19:44 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 19:02 x86_pmu_start WARN_ON Dave Jones
2014-02-10 21:26 ` Vince Weaver
2014-02-11 13:29 ` Peter Zijlstra
2014-02-12 21:04 ` Vince Weaver
2014-02-13 14:11 ` Vince Weaver
2014-02-13 17:35 ` Vince Weaver
2014-02-13 22:13 ` Vince Weaver
2014-02-17 15:28 ` Peter Zijlstra
2014-02-18 18:30 ` Vince Weaver
2014-02-18 22:20 ` Vince Weaver
2014-02-19 10:19 ` Peter Zijlstra
2014-02-19 22:34 ` Vince Weaver
2014-02-20 10:08 ` Peter Zijlstra
2014-02-20 15:47 ` Andi Kleen
2014-02-20 15:54 ` Peter Zijlstra
2014-02-20 17:31 ` Andi Kleen
2014-02-20 18:15 ` Peter Zijlstra
2014-02-20 18:23 ` Andi Kleen
2014-02-20 19:04 ` Steven Rostedt
2014-02-20 16:26 ` Steven Rostedt
2014-02-20 17:00 ` Peter Zijlstra
2014-02-20 17:43 ` Steven Rostedt
2014-02-20 17:46 ` Steven Rostedt
2014-02-20 18:18 ` Peter Zijlstra
2014-02-20 18:03 ` Vince Weaver
2014-02-20 18:23 ` Peter Zijlstra
2014-02-20 18:54 ` Vince Weaver
2014-02-20 19:21 ` Vince Weaver
2014-02-20 19:46 ` Vince Weaver [this message]
2014-02-21 14:37 ` Vince Weaver
2014-02-21 15:03 ` Peter Zijlstra
2014-02-21 20:18 ` Vince Weaver
2014-02-24 11:28 ` Peter Zijlstra
2014-02-26 5:59 ` Vince Weaver
2014-02-27 13:32 ` [tip:perf/core] perf/x86: Fix event scheduling tip-bot for Peter Zijlstra
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