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

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Message-ID: <20131017090730.GK2675@laptop.programming.kicks-ass.net>
Date:	Thu, 17 Oct 2013 11:07:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	LKML <linux-kernel@...r.kernel.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

On Thu, Oct 17, 2013 at 10:14:20AM +0200, Ingo Molnar wrote:
> > > 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.

The downside to such a sysfs entry will be the scope. It would either be
pmu wide (unwieldy for many PMUs) or be only per listed event; and we
really don't want exhaustive event lists in the kernel.

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