linux-kernel - Re: [PATCHv3 00/19] perf metric: Add support to reuse metric

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Message-ID: <20200725115143.GA1157288@krava>
Date:   Sat, 25 Jul 2020 13:51:43 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     kajoljain <kjain@...ux.ibm.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCHv3 00/19] perf metric: Add support to reuse metric

On Fri, Jul 24, 2020 at 11:22:28AM +0530, kajoljain wrote:

SNIP

> 
> Hi Jiri,
>        The change looks good to me. I tried with adding this patch on top of your perf/metric branch. It did resolve the issue of not printing
> all chips data. And now I can see proper values for hv-24x7 metric events.
> 
> I was also trying by adding new metric using the feature added in this patchset with something like this:
> 
> 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 8383a37647ad..dfe4bd63b587 100644
> --- a/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
> +++ b/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
> @@ -16,6 +16,11 @@
>          "MetricName": "PowerBUS_Frequency",
>          "ScaleUnit": "2.5e-7GHz"
>      },
> +    {
> +       "MetricExpr": "Memory_WR_BW_Chip + Memory_RD_BW_Chip",
> +        "MetricName": "Total_Memory_BW",
> +        "ScaleUnit": "1.6e-2MB"
> +    },

hum, we'll need special case this.. because Memory_WR_BW_Chip will
unwind to Memory_WR_BW_Chip_[01] and Total_Memory_BW is not aware of
that.. what's the expected behaviour in here?

have Total_Memory_BW_[01] for each runtime arg?

I think this will need to come on top of this changes,
it's already too big

thanks,
jirka

> 
> I guess as we have dependency on '?' symbol, I am not able to see all chips data for Total_Memory_BW.
> I am not sure if Its expected behavior?
> 
> This is what I am getting:
> 
> [root@...-zz189-lp4 perf]# ./perf stat --metric-only -M Total_Memory_BW,Memory_WR_BW_Chip,Memory_RD_BW_Chip -I 1000 -C 0
> #           time  MB  Total_Memory_BW MB  Memory_RD_BW_Chip_1 MB  Memory_WR_BW_Chip_1 MB  Memory_WR_BW_Chip_0 MB  Memory_RD_BW_Chip_0 
>      1.000067388                 36.4                      0.2                     36.3                     65.0                     72.1 
>      2.000374276                 36.2                      0.3                     35.9                     65.4                     77.9 
>      3.000543202                 36.3                      0.3                     36.0                     68.7                     81.2 
>      4.000702855                 36.3                      0.3                     36.0                     70.9                     93.3 
>      5.000856837                 36.0                      0.2                     35.8                     67.4                     81.5 
> ^C     5.367865273                 13.2                      0.1                     13.1                     23.5                     28.3 
>  Performance counter stats for 'CPU(s) 0':
>                194.4                      1.3                    193.1                    361.0                    434.3 
>        5.368039176 seconds time elapsed
> 
> We can only get single chip data's sum in Total_Memory_BW. Please let me know if I am missing something.

SNIP