linux-kernel - Re: Tracing of power:power

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Date:	Tue, 04 May 2010 20:31:57 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ronny Tschüter <Ronny.Tschueter@...dresden.de>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Tracing of power:power_start events doesn't work

On Mon, 2010-05-03 at 15:19 +0200, Ronny Tschüter wrote:
> Hello,
> 
> i use kernel version 2.6.33.2 (x86-64, Core 2 Duo) and the perf events 
> to track frequency and c states of my cpu. But if i want to trace 
> power:power_start events, it does not work. After typing
> 
> echo "power:power_start" | sudo tee set_event
> 
> on the console, the trace doesn't contain such events. 
> power:power_frequency and power:power_end events are reported correctly 
> by the system. I read in the mailing list that Robert Schoene had a 
> similiar problem, but with power:power_end events. Is there a known bug 
> regarding to trace_power_start methods in process.c?

Is this for perf or ftrace? I'm assuming you did this from the debugfs
tracing directory. The set_event file is for ftrace not perf.

-- Steve


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