Messages in this thread | | | Date | Wed, 16 Oct 2013 14:53:02 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v2 0/3] perf,x86: add Intel RAPL PMU support |
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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.
- Arnaldo
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