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

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Date:	Thu, 14 Jun 2012 23:09:52 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...hat.com, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	eranian@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] perf, x86: Making hardware events tranlations sysfs
 available

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.


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