Re: [PATCH v2 6/7] perf, x86: enable large PEBS interrupt threshold for SNB/IVB/HSW

Peter Zijlstra
2014-07-15T11:12:25Z

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On Tue, Jul 15, 2014 at 04:58:58PM +0800, Yan, Zheng wrote:
> Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
> ---
> arch/x86/kernel/cpu/perf_event_intel.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index cb5a838..dba03b3 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -2456,6 +2456,7 @@ __init int intel_pmu_init(void)
> intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
> X86_CONFIG(.event=0xb1, .umask=0x01, .inv=1, .cmask=1);
>
> + x86_pmu.multi_pebs = true;
> pr_cont("SandyBridge events, ");
> break;
> case 58: /* IvyBridge */
> @@ -2484,6 +2485,7 @@ __init int intel_pmu_init(void)
> intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> X86_CONFIG(.event=0x0e, .umask=0x01, .inv=1, .cmask=1);
>
> + x86_pmu.multi_pebs = true;
> pr_cont("IvyBridge events, ");
> break;
>
> @@ -2511,6 +2513,8 @@ __init int intel_pmu_init(void)
> x86_pmu.get_event_constraints = hsw_get_event_constraints;
> x86_pmu.cpu_events = hsw_events_attrs;
> x86_pmu.lbr_double_abort = true;
> +
> + x86_pmu.multi_pebs = true;
> pr_cont("Haswell events, ");
> break;

NAK for the very same reason. All (PEBS capable) hardware supports this.

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