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

[Arnaldo Carvalho de Melo]

Em Wed, Oct 23, 2013 at 11:34:42AM +0200, Stephane Eranian escreveu:
> On Wed, Oct 23, 2013 at 12:18 AM, Arnaldo Carvalho de Melo
> > 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).

That would be a new one :-)

At some point I'll study the %pM, etc things in the kernel printk code
to come up with something like perf_evsel__{f,scn}printf that allows us
to use just one string format and then pick things like units as a
modifier, but till then having these fprintf variants seems good enough.

- Arnaldo
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