linux-kernel - Re: [PATCH v7 8/8] perf vendor events: Add JSON metrics for Arm CMN

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Date:   Thu, 24 Aug 2023 21:13:58 -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>,
        James Clark <james.clark@....com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...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, linux-doc@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>
Subject: Re: [PATCH v7 8/8] perf vendor events: Add JSON metrics for Arm CMN

On Mon, Aug 21, 2023 at 1:36 AM Jing Zhang <renyu.zj@...ux.alibaba.com> wrote:
>
> Add JSON metrics for Arm CMN. Currently just add part of CMN PMU
> metrics which are general and compatible for any SoC with CMN-ANY.
>
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
> Reviewed-by: John Garry <john.g.garry@...cle.com>
> ---
>  .../pmu-events/arch/arm64/arm/cmn/sys/metric.json  | 74 ++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 tools/perf/pmu-events/arch/arm64/arm/cmn/sys/metric.json
>
> diff --git a/tools/perf/pmu-events/arch/arm64/arm/cmn/sys/metric.json b/tools/perf/pmu-events/arch/arm64/arm/cmn/sys/metric.json
> new file mode 100644
> index 0000000..64db534
> --- /dev/null
> +++ b/tools/perf/pmu-events/arch/arm64/arm/cmn/sys/metric.json
> @@ -0,0 +1,74 @@
> +[
> +       {
> +               "MetricName": "slc_miss_rate",
> +               "BriefDescription": "The system level cache miss rate.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "hnf_cache_miss / hnf_slc_sf_cache_access",
> +               "ScaleUnit": "100%",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"

Here a ';' is used as a separator, but for "Unit" ',' is used as a
separator. Is there a reason for the inconsistency?

Thanks,
Ian

> +       },
> +       {
> +               "MetricName": "hnf_message_retry_rate",
> +               "BriefDescription": "HN-F message retry rate indicates whether a lack of credits is causing the bottlenecks.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "hnf_pocq_retry / hnf_pocq_reqs_recvd",
> +               "ScaleUnit": "100%",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       },
> +       {
> +               "MetricName": "sf_hit_rate",
> +               "BriefDescription": "Snoop filter hit rate can be used to measure the snoop filter efficiency.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "hnf_sf_hit / hnf_slc_sf_cache_access",
> +               "ScaleUnit": "100%",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       },
> +       {
> +               "MetricName": "mc_message_retry_rate",
> +               "BriefDescription": "The memory controller request retries rate indicates whether the memory controller is the bottleneck.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "hnf_mc_retries / hnf_mc_reqs",
> +               "ScaleUnit": "100%",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       },
> +       {
> +               "MetricName": "rni_actual_read_bandwidth.all",
> +               "BriefDescription": "This event measure the actual bandwidth that RN-I bridge sends to the interconnect.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "rnid_rxdat_flits * 32 / 1e6 / duration_time",
> +               "ScaleUnit": "1MB/s",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       },
> +       {
> +               "MetricName": "rni_actual_write_bandwidth.all",
> +               "BriefDescription": "This event measures the actual write bandwidth at RN-I bridges.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "rnid_txdat_flits * 32 / 1e6 / duration_time",
> +               "ScaleUnit": "1MB/s",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       },
> +       {
> +               "MetricName": "rni_retry_rate",
> +               "BriefDescription": "RN-I bridge retry rate indicates whether the memory controller is the bottleneck.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "rnid_txreq_flits_retried / rnid_txreq_flits_total",
> +               "ScaleUnit": "100%",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       },
> +       {
> +               "MetricName": "sbsx_actual_write_bandwidth.all",
> +               "BriefDescription": "sbsx actual write bandwidth.",
> +               "MetricGroup": "cmn",
> +               "MetricExpr": "sbsx_txdat_flitv * 32 / 1e6 / duration_time",
> +               "ScaleUnit": "1MB/s",
> +               "Unit": "arm_cmn",
> +               "Compat": "434*;436*;43c*;43a*"
> +       }
> +]
> --
> 1.8.3.1
>