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

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Date:	Wed, 23 Oct 2013 12:22:52 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Jiri Olsa <jolsa@...hat.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: Re: [PATCH v2 0/3] perf,x86: add Intel RAPL PMU support

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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