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

[Rafael J. Wysocki]

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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