linux-kernel - Re: [PATCH v2 0/6] perf arm64 metricgroup support

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Date:   Fri, 26 Mar 2021 10:57:40 +0000
From:   John Garry <john.garry@...wei.com>
To:     "Paul A. Clarke" <pc@...ibm.com>
CC:     <will@...nel.org>, <mathieu.poirier@...aro.org>,
        <leo.yan@...aro.org>, <peterz@...radead.org>, <mingo@...hat.com>,
        <acme@...nel.org>, <mark.rutland@....com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>, <irogers@...gle.com>, <linuxarm@...wei.com>,
        <kjain@...ux.ibm.com>, <kan.liang@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <zhangshaokun@...ilicon.com>
Subject: Re: [PATCH v2 0/6] perf arm64 metricgroup support

On 25/03/2021 20:39, Paul A. Clarke wrote:
> On Thu, Mar 25, 2021 at 06:33:12PM +0800, John Garry wrote:
>> Metric reuse support is added for pmu-events parse metric testcase.
>> This had been broken on power9 recentlty:
>> https://lore.kernel.org/lkml/20210324015418.GC8931@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com/
> 
> Much better.  Before:
> --
> $ perf test -v 10 2>&1 | grep -i error | wc -l
> 112
> --
> After:
> --
> $ perf test -v 10 2>&1 | grep -i error | wc -l
> 17
> --
> 
> And these seem like different types of issues:
> --
> $ perf test -v 10 2>&1 | grep -i error
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_powerbus0_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs01_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> Error string 'Cannot find PMU `nest_mcs23_imc'. Missing kernel support?' help '(null)'
> --
> 

This looks suspicious.

Firstly, does /sys/bus/event_source/devices/nest_mcs01_imc (or others, 
above) exist on your system? I guess not.

Secondly, checking Documentation/powerpc/imc.rst, we have examples of:
nest_mcs01/PM_MCS01_64B_R...

So is the PMU name correct in the metric file for nest_mcs01_imc? 
Looking at the kernel driver file, arch/powerpc/perf/imc-pmu.c, it seems 
to be correct. Not sure.

Thanks,
John



> (Added Kajol Jain to CC)
>