linux-kernel - Re: [PATCH v3 7/7] docs: perf: Update metric usage for Alibaba's T-Head PMU driver

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Date:   Tue, 30 May 2023 18:19:39 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jing Zhang <renyu.zj@...ux.alibaba.com>
Cc:     John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Robin Murphy <robin.murphy@....com>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH v3 7/7] docs: perf: Update metric usage for Alibaba's
 T-Head PMU driver

On Tue, May 30, 2023 at 2:19 AM Jing Zhang <renyu.zj@...ux.alibaba.com> wrote:
>
> Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update
> its usage in the documentation.
>
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>

Acked-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  Documentation/admin-guide/perf/alibaba_pmu.rst | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/admin-guide/perf/alibaba_pmu.rst b/Documentation/admin-guide/perf/alibaba_pmu.rst
> index 11de998..7d84002 100644
> --- a/Documentation/admin-guide/perf/alibaba_pmu.rst
> +++ b/Documentation/admin-guide/perf/alibaba_pmu.rst
> @@ -88,6 +88,11 @@ data bandwidth::
>      -e ali_drw_27080/hif_rmw/ \
>      -e ali_drw_27080/cycle/ -- sleep 10
>
> +Example usage of counting all memory read/write bandwidth by metric::
> +
> +  perf stat -M ddr_read_bandwidth.all -- sleep 10
> +  perf stat -M ddr_write_bandwidth.all -- sleep 10
> +
>  The average DRAM bandwidth can be calculated as follows:
>
>  - Read Bandwidth =  perf_hif_rd * DDRC_WIDTH * DDRC_Freq / DDRC_Cycle
> --
> 1.8.3.1
>