linux-kernel - Re: [PATCH] tracing, perf: add more power related events

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Message-ID: <20100917162412.GB3341@elte.hu>
Date:	Fri, 17 Sep 2010 18:24:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Renninger <trenn@...e.de>
Cc:	Jean Pihet <jean.pihet@...oldbits.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Len Brown <len.brown@...el.com>, arjan@...radead.org,
	Kevin Hilman <khilman@...prootsystems.com>,
	linux-kernel@...r.kernel.org, discuss@...swatts.org,
	linux-pm@...ts.linux-foundation.org, linux-omap@...r.kernel.org,
	linux-perf-users@...r.kernel.org, linux-trace-users@...r.kernel.org
Subject: Re: [PATCH] tracing, perf: add more power related events


* Thomas Renninger <trenn@...e.de> wrote:

> On Friday 17 September 2010 16:24:59 Ingo Molnar wrote:
> > 
> > * Jean Pihet <jean.pihet@...oldbits.com> wrote:
> > 
> > > > Apropos documentation..., are the power trace events documented
> > > > somewhere?
> > >
> > > No. We need something like Documentation/trace/events-kmem.txt. I
> > > can write that with for the new power API.
> > Such a patch introducing events-power.txt would be most welcome!
> Better wait a bit...
> As soon as it exists, things are harder to change.
> As long as there isn't an API documented, there doesn't exist one
> (yes we want to have perf timechart, etc. still functional/compatible,
> but still, better let's do not the same mistake with some quick shots).

Music to my ears ;-) I was waiting for ACPI side feedback to all this, 
so whatever we do it would be nice to cover ARM and x86 as well - and in 
a single coherent framework.

[ You dont even have to document it, as good code is self-explanatory ;-) ]

Thanks,

	Ingo
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