Re: [PATCH 1/6] perf, x86: Making hardware events tranlations sysfsavailable
From: Jiri Olsa
Date: Fri Jun 15 2012 - 03:29:15 EST
On Thu, Jun 14, 2012 at 11:36:51PM +0200, Stephane Eranian wrote:
> On Thu, Jun 14, 2012 at 11:09 PM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> 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.
humm... right :)
how about the term name 'event=...', could I always assume it's 'event',
or do we want some arch specific connection for that?
jirka
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