linux-kernel - Re: [PATCH 1/6] perf, x86: Making hardware events tranlations sysfs available

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Date:	Thu, 14 Jun 2012 23:36:51 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] perf, x86: Making hardware events tranlations sysfs available

On Thu, Jun 14, 2012 at 11:09 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Thu, 2012-06-14 at 22:38 +0200, Jiri Olsa wrote:
>> Making hardware events tranlations available throught the sysfs.
>> Adding 'events' group attribute under the sysfs x86 PMU record
>> with attribute/file for each hardware event:
>>
>>   # ls  /sys/devices/cpu/events/
>>   branch_instructions
>>   branch_misses
>>   bus_cycles
>>   cache_misses
>>   cache_references
>>   cycles
>>   instructions
>>   ref_cycles
>>   stalled_cycles_backend
>>   stalled_cycles_frontend
>>
>> The file - ID mappings is:
>>
>>   file                      hw id
>>   ----------------------------------------------------------------
>>   cycles                    PERF_COUNT_HW_CPU_CYCLES
>>   instructions              PERF_COUNT_HW_INSTRUCTIONS
>>   cache_references          PERF_COUNT_HW_CACHE_REFERENCES
>>   cache_misses              PERF_COUNT_HW_CACHE_MISSES
>>   branch_instructions       PERF_COUNT_HW_BRANCH_INSTRUCTIONS
>>   branch_misses             PERF_COUNT_HW_BRANCH_MISSES
>>   bus_cycles                PERF_COUNT_HW_BUS_CYCLES
>>   stalled_cycles_frontend   PERF_COUNT_HW_STALLED_CYCLES_FRONTEND
>>   stalled_cycles_backend    PERF_COUNT_HW_STALLED_CYCLES_BACKEND
>>   ref_cycles                PERF_COUNT_HW_REF_CPU_CYCLES
>>
>> Each attribute/file contains HW ID event translation for the currently
>> running CPU model
>>
>>   # cat /sys/devices/cpu/events/instructions
>>   0xc0
>
> Why not have it consistent with the stuff done for uncore where events
> read: 'event=0xc0', ie the regular field=value stuff.
>
Yes, you want that. Because those events may need more than a code.
You want full syntax capability. So return a string.
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