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

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Date:	Thu, 17 Oct 2013 10:14:20 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	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


* Stephane Eranian <eranian@...gle.com> wrote:

> On Wed, Oct 16, 2013 at 7:53 PM, Arnaldo Carvalho de Melo
> <acme@...hat.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@...nel.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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