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

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Date:	Tue, 22 Oct 2013 20:18:03 -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 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.e. a perf_evsel__fprintf_value(evsel) would append a unit string, if
available.

- 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@...nel.org> wrote:
> >
> > * 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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