linux-kernel - Re: [PATCH] perf/tools/pmu-events/powerpc: Added nest imc metric events

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Date:   Sun, 5 Jul 2020 18:30:30 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Kajol Jain <kjain@...ux.ibm.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Paul Clarke <pc@...ibm.com>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        maddy@...ux.ibm.com, Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        "Liang, Kan" <kan.liang@...ux.intel.com>, nasastry@...ibm.com
Subject: Re: [PATCH] perf/tools/pmu-events/powerpc: Added nest imc metric events

On Thu, Jul 2, 2020 at 11:57 PM Kajol Jain <kjain@...ux.ibm.com> wrote:
>
> Added nest imc metric events.

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

> Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
> ---
>  .../arch/powerpc/power9/nest_metrics.json     | 35 +++++++++++++++++++
>  1 file changed, 35 insertions(+)
>
> diff --git a/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json b/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
> index c121e526442a..8383a37647ad 100644
> --- a/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
> +++ b/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
> @@ -15,5 +15,40 @@
>         "MetricExpr": "(hv_24x7@...PB_CYC\\,chip\\=?@ )",
>          "MetricName": "PowerBUS_Frequency",
>          "ScaleUnit": "2.5e-7GHz"
> +    },
> +    {
> +       "MetricExpr" : "nest_mcs01_imc@...MCS01_128B_RD_DISP_PORT01@ + nest_mcs01_imc@...MCS01_128B_RD_DISP_PORT23@",
> +       "MetricName" : "mcs01-read",
> +       "MetricGroup" : "memory_bw",
> +       "ScaleUnit": "6.1e-5MB"

nit: I'm guessing this is from:
64.0/(1024.0*1024.0) = 6.103515625e-05
and for reference:
64.0/(1000.0*1000.0) = 6.3999999999999997e-05
should the unit be MiB?
https://en.wikipedia.org/wiki/Kibibyte

Searching around I only see knightslanding using MiB but it seems to
be using it in the 1000^2 case which probably means it should be MB:
knightslanding/uncore-memory.json:        "ScaleUnit": "6.4e-05MiB"

Given there is some confusion I wonder if it makes sense to just make
this 0.015625B and then we have a utility function that selects the
best unit for "bytes" with config options similar to --big-num?

Thanks,
Ian

> +    },
> +    {
> +       "MetricExpr" : "nest_mcs23_imc@...MCS23_128B_RD_DISP_PORT01@ + nest_mcs23_imc@...MCS23_128B_RD_DISP_PORT23@",
> +       "MetricName" : "mcs23-read",
> +       "MetricGroup" : "memory_bw",
> +       "ScaleUnit": "6.1e-5MB"
> +    },
> +    {
> +       "MetricExpr" : "nest_mcs01_imc@...MCS01_128B_WR_DISP_PORT01@ + nest_mcs01_imc@...MCS01_128B_WR_DISP_PORT23@",
> +       "MetricName" : "mcs01-write",
> +       "MetricGroup" : "memory_bw",
> +       "ScaleUnit": "6.1e-5MB"
> +    },
> +    {
> +       "MetricExpr" : "nest_mcs23_imc@...MCS23_128B_WR_DISP_PORT01@ + nest_mcs23_imc@...MCS23_128B_WR_DISP_PORT23@",
> +       "MetricName" : "mcs23-write",
> +       "MetricGroup" : "memory-bandwidth",
> +       "ScaleUnit": "6.1e-5MB"
> +    },
> +    {
> +       "MetricExpr" : "nest_powerbus0_imc@...PB_CYC@",
> +       "MetricName" : "powerbus_freq",
> +       "ScaleUnit": "1e-9GHz"
> +    },
> +    {
> +       "MetricExpr" : "(nest_mcs01_imc@...MCS01_128B_RD_DISP_PORT01@ + nest_mcs01_imc@...MCS01_128B_RD_DISP_PORT23@ + nest_mcs23_imc@...MCS23_128B_RD_DISP_PORT01@ + nest_mcs23_imc@...MCS23_128B_RD_DISP_PORT23@ + nest_mcs01_imc@...MCS01_128B_WR_DISP_PORT01@ + nest_mcs01_imc@...MCS01_128B_WR_DISP_PORT23@ + nest_mcs23_imc@...MCS23_128B_WR_DISP_PORT01@ + nest_mcs23_imc@...MCS23_128B_WR_DISP_PORT23@)",
> +       "MetricName" : "Memory-bandwidth-MCS",
> +       "MetricGroup" : "memory_bw",
> +       "ScaleUnit": "6.1e-5MB"
>      }
>  ]
> --
> 2.17.1
>