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

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Date:   Mon, 20 Jul 2020 14:32:40 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Jiri Olsa <jolsa@...hat.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 7/20/20 1:49 PM, Jiri Olsa wrote:
> On Mon, Jul 20, 2020 at 01:39:24PM +0530, kajoljain wrote:
> 
> SNIP
> 
>> This is with your perf/metric branch:
>> command# ./perf stat -M PowerBUS_Frequency -C 0 -I 1000
>> assertion failed at util/metricgroup.c:709
>> #           time             counts unit events
>>      1.000054545          7,807,505      hv_24x7/pm_pb_cyc,chip=0/ #      2.0 GHz  PowerBUS_Frequency_0
>>      1.000054545          7,807,485      hv_24x7/pm_pb_cyc,chip=1/                                   
>>      2.000232761          7,807,500      hv_24x7/pm_pb_cyc,chip=0/ #      2.0 GHz  PowerBUS_Frequency_0
>>      2.000232761          7,807,478      hv_24x7/pm_pb_cyc,chip=1/                                   
>>      3.000363762          7,799,665      hv_24x7/pm_pb_cyc,chip=0/ #      1.9 GHz  PowerBUS_Frequency_0
>>      3.000363762          7,807,502      hv_24x7/pm_pb_cyc,chip=1/                                   
>> ^C     3.259418599          2,022,150      hv_24x7/pm_pb_cyc,chip=0/ #      0.5 GHz  PowerBUS_Frequency_0
>>      3.259418599          2,022,164      hv_24x7/pm_pb_cyc,chip=1/                                   
>>
>>  Performance counter stats for 'CPU(s) 0':
>>
>>         25,436,820      hv_24x7/pm_pb_cyc,chip=0/ #      6.4 GHz  PowerBUS_Frequency_0
>>         25,444,629      hv_24x7/pm_pb_cyc,chip=1/                                   
>>
>>        3.259505529 seconds time elapsed
> 
> I found the bug, we are not adding runtime metrics as standalone ones,
> but as referenced metrics.. will fix and try to add test for that
> 
> as for testing.. do I need some special ppc server to have support for this? 

Hi jiri,
    We need power9 lpar machine and need to make sure `CONFIG_HV_PERF_CTRS` is
enabled.

Thanks,
Kajol Jain
> 
> thanks,
> jirka
>