Re: [RFC PATCH v1 1/4] docs: perf: Add documentation for HiSilicon PMCU

[Jie Zhan]

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.
> +
> ...