Messages in this thread | | | Date | Fri, 15 Jun 2012 09:32:20 +0200 | Subject | Re: [PATCH 1/6] perf, x86: Making hardware events tranlations sysfs available | From | Stephane Eranian <> |
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On Fri, Jun 15, 2012 at 9:29 AM, Jiri Olsa <jolsa@redhat.com> wrote: > 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@chello.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. > > 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? > You should not assume anything. You grab the string from sysfs and put it through your regular parser. It could have arch specific terms in it. That's how I suspect this is done for uncore.
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