Messages in this thread | | | Date | Thu, 17 Oct 2013 10:14:20 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH v2 0/3] perf,x86: add Intel RAPL PMU support |
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* Stephane Eranian <eranian@google.com> wrote:
> On Wed, Oct 16, 2013 at 7:53 PM, Arnaldo Carvalho de Melo > <acme@redhat.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@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. > > 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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