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The mapping of perf_events generic hardware events to actual PMU events on ARM PMUv3 may not always be correct. This is in particular true for the PERF_COUNT_HW_BRANCH_INSTRUCTIONS event. Although the mapping points to an architected event, it may not always be available. This can be seen with a simple: $ perf stat -e branches sleep 0 Performance counter stats for 'sleep 0': <not supported> branches 0.001401081 seconds time elapsed Yet the hardware does have an event that could be used for branches. Dynamically check for a supported hardware event which can be used for PERF_COUNT_HW_BRANCH_INSTRUCTIONS at mapping time. And with that: $ perf stat -e branches sleep 0 Performance counter stats for 'sleep 0': 166,739 branches 0.000832163 seconds time elapsed Co-developed-by: Stephane Eranian <eranian@google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Co-developed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Co-developed-by: Peter Newman <peternewman@google.com> Signed-off-by: Peter Newman <peternewman@google.com> Link: https://lore.kernel.org/all/YvunKCJHSXKz%2FkZB@FVFF77S0Q05N Link: https://lore.kernel.org/r/20230411093809.657501-1-peternewman@google.com Signed-off-by: Will Deacon <will@kernel.org> |
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.. | ||
amlogic | ||
arm_cspmu | ||
hisilicon | ||
alibaba_uncore_drw_pmu.c | ||
apple_m1_cpu_pmu.c | ||
arm-cci.c | ||
arm-ccn.c | ||
arm-cmn.c | ||
arm_dmc620_pmu.c | ||
arm_dsu_pmu.c | ||
arm_pmu.c | ||
arm_pmu_acpi.c | ||
arm_pmu_platform.c | ||
arm_pmuv3.c | ||
arm_smmuv3_pmu.c | ||
arm_spe_pmu.c | ||
fsl_imx8_ddr_perf.c | ||
Kconfig | ||
Makefile | ||
marvell_cn10k_ddr_pmu.c | ||
marvell_cn10k_tad_pmu.c | ||
qcom_l2_pmu.c | ||
qcom_l3_pmu.c | ||
riscv_pmu.c | ||
riscv_pmu_legacy.c | ||
riscv_pmu_sbi.c | ||
thunderx2_pmu.c | ||
xgene_pmu.c |