Messages in this thread | | | Date | Tue, 7 Feb 2023 11:03:35 +0800 | Subject | Re: [RFC PATCH v1 1/4] docs: perf: Add documentation for HiSilicon PMCU | From | Jie Zhan <> |
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On 06/02/2023 14:51, Jie Zhan wrote:
> + > +2. Profiling with ``perf-record``. > + > + The command to start the sampling is:: > + > + perf record -e hisi_pmcu_sccl3/<configs>/ > + > + Users can pass the following optional parameters to ``<configs>``: > + > + - nr_sample: number of samples to take. This defaults to 128. > + - sample_period_ms: time interval in microseconds for PMU counters to keep
Spot a typo before causing any confusion. This should be "milliseconds" rather than "microseconds".
Jie
> + counting for each event. This defaults to 3, i.e. 3ms, and its max > + value is 85,899, i.e. 85 seconds. > + - pmccfiltr: bits 31-24 of the sysreg PMCCFILTR_EL0, which controls how the > + cycle counter increments. This defaults to 0x00. Please refer to the > + "Performance Monitors external register descriptions" of *Arm Architecture > + Reference Manual for A-profile architecture* on how to configure > + PMCCFILTR_EL0. > + > ...
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