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From: Ramkumar Ramachandra <artagnon@gmail.com>
Date: Tue, 10 Sep 2013 18:12:29 +0530
Message-ID: <CALkWK0my-gVYWEOJkX2UX4VMJ7jABogs1Dap3b7S3jmQMATNQA@mail.gmail.com>
Subject: Re: PEBS bug on HSW: "Unexpected number of pebs records 10" (was: Re:
 [GIT PULL] perf changes for v3.12)
To: eranian@gmail.com
Cc: Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>, Andi Kleen <andi@firstfloor.org>
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Stephane Eranian wrote:
> [ 2229.021966] Call Trace:
> [ 2229.021967]  <NMI>  [<ffffffff8159dcd6>] dump_stack+0x46/0x58
> [ 2229.021976]  [<ffffffff8108dfdc>] warn_slowpath_common+0x8c/0xc0
> [ 2229.021979]  [<ffffffff8108e0c6>] warn_slowpath_fmt+0x46/0x50
> [ 2229.021982]  [<ffffffff810646c8>] intel_pmu_drain_pebs_hsw+0xa8/0xc0
> [ 2229.021986]  [<ffffffff810668f0>] intel_pmu_handle_irq+0x220/0x380
> [ 2229.021991]  [<ffffffff810c1d35>] ? sched_clock_cpu+0xc5/0x120
> [ 2229.021995]  [<ffffffff815a5a84>] perf_event_nmi_handler+0x34/0x60
> [ 2229.021998]  [<ffffffff815a52b8>] nmi_handle.isra.3+0x88/0x180
> [ 2229.022001]  [<ffffffff815a5490>] do_nmi+0xe0/0x330
> [ 2229.022004]  [<ffffffff815a48f7>] end_repeat_nmi+0x1e/0x2e
> [ 2229.022008]  [<ffffffff810652b3>] ? intel_pmu_pebs_enable_all+0x33/0x40
> [ 2229.022011]  [<ffffffff810652b3>] ? intel_pmu_pebs_enable_all+0x33/0x40
> [ 2229.022015]  [<ffffffff810652b3>] ? intel_pmu_pebs_enable_all+0x33/0x40
> [ 2229.022016]  <<EOE>>  [<ffffffff810659f3>] intel_pmu_enable_all+0x23/0xa0
> [ 2229.022021]  [<ffffffff8105ff84>] x86_pmu_enable+0x274/0x310
> [ 2229.022025]  [<ffffffff81141927>] perf_pmu_enable+0x27/0x30
> [ 2229.022029]  [<ffffffff81143219>] perf_event_context_sched_in+0x79/0xc0

Unnecessary repetition of the same task on multiple cores seems to be
the issue, although I'm not sure. Haven't gone through mingo's trace
yet.
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