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SubjectRe: [PATCH] perf events, x86: Add SandyBridge stalled-cycles-frontend/backend events

* Lin Ming <ming.m.lin@intel.com> wrote:

> Extend the Intel SandyBridge PMU driver with definitions
> for generic front-end and back-end stall events.
>
> ( As commit 3011203 says, these are only approximations. )
>
> Signed-off-by: Lin Ming <ming.m.lin@intel.com>
> ---
> arch/x86/kernel/cpu/perf_event_intel.c | 6 ++++++
> 1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index c1ec7a5..61cbf48 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -1485,6 +1485,12 @@ static __init int intel_pmu_init(void)
>
> x86_pmu.event_constraints = intel_snb_event_constraints;
> x86_pmu.pebs_constraints = intel_snb_pebs_events;
> +
> + /* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
> + intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x180010e;
> + /* UOPS_DISPATCHED.THREAD,c=1,i=1 to count stall cycles*/
> + intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x18001b1;
> +

Nice!

Could you check Intel Atom perhaps as well, does it have any useful event to
approximate this?

Thanks,

Ingo


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