linux-kernel - Re: [PATCH] trace power_frequency events on the correct cpu (for Intel x86 CPUs)

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Message-ID: <4B9F9361.6060208@linux.intel.com>
Date:	Tue, 16 Mar 2010 07:19:13 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Thomas Renninger <trenn@...e.de>
CC:	Robert Schöne <robert.schoene@...dresden.de>,
	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	cpufreq <cpufreq@...r.kernel.org>, x86@...nel.org
Subject: Re: [PATCH] trace power_frequency events on the correct cpu  (for
 Intel x86 CPUs)


> But something else...:
> What exactly is the power tracer good for and what is it
> capable of which cpufreq_stats is not capable to do?

look at timechart for example.....
it's extremely useful to have this for us that do power tuning...
cpufreq_stats is nice but not nearly good enough since you only get averages,
not time behavior.
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