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Date: Tue, 10 Sep 2013 18:12:29 +0530 From: Ramkumar Ramachandra <artagnon@...il.com> To: eranian@...il.com Cc: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Arnaldo Carvalho de Melo <acme@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <andi@...stfloor.org> Subject: Re: PEBS bug on HSW: "Unexpected number of pebs records 10" (was: Re: [GIT PULL] perf changes for v3.12) 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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