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SubjectRe: [PATCH v2 0/3] perf,x86: add Intel RAPL PMU support
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Arnaldo,

On Wed, Oct 23, 2013 at 12:18 AM, Arnaldo Carvalho de Melo
<acme@redhat.com> wrote:
> Em Tue, Oct 22, 2013 at 06:47:38PM +0200, Stephane Eranian escreveu:
>> I have updated my RAPL patches to implement the suggested changes.
>> I will post the patch very soon. The new look and feel is as folllows:
>
>> # perf stat -a -e power/energy-cores/,power/energy-pkg/,ref-cycles -I
>> 1000 sleep 1000
>> # time unit counts events
>> 1.000264953 Joules 2.09 power/energy-cores/
>> [100.00%]
>> 1.000264953 Joules 5.94 power/energy-pkg/
>> 1.000264953 160,530,320 ref-cycles
>> 2.000640422 Joules 2.07 power/energy-cores/
>> 2.000640422 Joules 5.94 power/energy-pkg/
>> 2.000640422 152,673,056 ref-cycles
>> 3.000964416 Joules 2.08 power/energy-cores/
>> 3.000964416 Joules 5.93 power/energy-pkg/
>> 3.000964416 158,779,184 ref-cycles
>
> What about:
>
> # perf stat -a -e power/energy-cores/,power/energy-pkg/,ref-cycles -I 1000 sleep 1000
> # time events
> 1.000264953 2.09 Joules power/energy-cores/
> 1.000264953 5.94 Joules power/energy-pkg/
> 1.000264953 160,530,320 ref-cycles
> 2.000640422 2.07 Joules power/energy-cores/
> 2.000640422 5.94 Joules power/energy-pkg/
> 2.000640422 152,673,056 ref-cycles
> 3.000964416 2.08 Joules power/energy-cores/
> 3.000964416 5.93 Joules power/energy-pkg/
> 3.000964416 158,779,184 ref-cycles
>
> ?
>
> Or even 2.09J power/energy-cores/?
>
I can try that.

> I.e. a perf_evsel__fprintf_value(evsel) would append a unit string, if
> available.
>
I don't have this function is my tree yet (tip.git).

> - Arnaldo
>
>
>>
>> # ls -1 /sys/devices/power/events/
>> energy-cores
>> energy-cores.scale
>> energy-cores.unit
>> energy-pkg
>> energy-pkg.scale
>> energy-pkg.unit
>>
>> # cat /sys/devices/power/events/energy-cores.scale
>> 2.3e-10
>> # cat /sys/devices/power/events/energy-cores.unit
>> Joules
>>
>> Of course, this unit and scaling support is generic and not limited
>> to the RAPL events. For now, this only works with events exported
>> by the kernel via sysfs.
>>
>>
>>
>> On Thu, Oct 17, 2013 at 10:14 AM, Ingo Molnar <mingo@kernel.org> wrote:
>> >
>> > * Stephane Eranian <eranian@google.com> wrote:
>> >
>> >> On Wed, Oct 16, 2013 at 7:53 PM, Arnaldo Carvalho de Melo
>> >> <acme@redhat.com> wrote:
>> >> > Em Wed, Oct 16, 2013 at 03:13:54PM +0200, Stephane Eranian escreveu:
>> >> >> On Wed, Oct 16, 2013 at 2:46 PM, Ingo Molnar <mingo@kernel.org> wrote:
>> >> >> > We should also tell user-space that the unit of this counter is 'Joule'.
>> >> >> >
>> >> >> > Then things like:
>> >> >> >
>> >> >> > perf stat -a -e power/* sleep 1
>> >> >> >
>> >> >> > would output, without knowing any RAPL details:
>> >> >> >
>> >> >> > 0.20619 Joule power/energy-core
>> >> >> > 2.42151 Joule power/energy-pkg
>> >> >> >
>> >> >> Not sure there is already some support for this in perf stat. Arnaldo?
>> >> >
>> >> > Nope, there is not, we would have to have some table somewhere with
>> >> > "event-regexp: unit-string"
>> >> >
>> >> >> If not that we need another sysfs file to export the unit. Another
>> >> >> possibility is for perf stat to recognize the power/* and extract the
>> >> >> unit from the event name. In my example power/joules-cores -> joules.
>> >> >
>> >> > I.e. you would be encoding the counter unit as the suffix, might as well
>> >> > call it "power/cores.joules" and use the dot as the separator for the
>> >> > unit, but would be just a compact form to encode the counter->unit
>> >> > table.
>> >>
>> >> May be easier to add a sysfs entry with the unit to display.
>> >
>> > Yes - with no entry meaning a raw 'count' or such.
>> >
>> > Thanks,
>> >
>> > Ingo


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