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

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Date:	Wed, 22 Sep 2010 20:09:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Jean Pihet <jean.pihet@...oldbits.com>,
	Thomas Renninger <trenn@...e.de>, Ingo Molnar <mingo@...e.hu>,
	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

On Wednesday, September 22, 2010, Arjan van de Ven wrote:
>   On 9/22/2010 8:31 AM, Jean Pihet wrote:
> > Hi,
> >
> > Here is a patch that redefines the power events API. The advantages
> > are: easier maintainance of the kernel and the
> > user space tools, a cleaner and more generic interface, more
> > parameters for fine tracing and even documentation!
> >
> > Thomas, this patch has your patch above merged in ('power-trace: Use
> > power_switch_state instead of power_start and power_end'). The revised
> > ACPI patch is coming asap.
> >
> > The trace points for x86 and OMAP are also udated accordingly.
> >
> > The pytimechart tool needs an update for the new API. This can be done
> > as soon as the kernel code gets merged in.
> 
> unfortunately this code is changing a userspace ABI... we really 
> shouldn't do that if we can avoid it,
> and here we can avoid it.
> 
> applications ARE using this stuff!

Apart from this, could we rename things like POWER_CSTATE to CPU_POWER_CSTATE
and state clearly in the docs that this whole thing is about CPU power?

Thanks,
Rafael
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