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

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Date:	Wed, 22 Sep 2010 17:36:04 +0200
From:	Jean Pihet <jean.pihet@...oldbits.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	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 Wed, Sep 22, 2010 at 5:33 PM, Arjan van de Ven <arjan@...ux.intel.com> 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!
What are the apps that are using it? I know about builtin-timechart,
pytimechart. Is powertop using this as well?

Is it better to go for a 3 steps approach (add new API, change tools,
deprecate old API) like proposed above?

Thanks,
Jean
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