linux-kernel - Re: [PATCH 5/8] trace: Convert the power tracer into an event tracer

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Message-ID: <20090915061645.0375ef60@infradead.org>
Date:	Tue, 15 Sep 2009 06:16:45 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, fweisbec@...il.com,
	peterz@...radead.org
Subject: Re: [PATCH 5/8] trace: Convert the power tracer into an event
 tracer

On Tue, 15 Sep 2009 11:43:16 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> Arjan van de Ven wrote:
> >>From f591a0f126263733d606838a5d113b9807b12c84 Mon Sep 17 00:00:00
> >>2001
> > From: Arjan van de Ven <arjan@...ux.intel.com>
> > Date: Sat, 12 Sep 2009 07:53:03 +0200
> > Subject: [PATCH] trace: Convert the power tracer into an event
> > tracer
> > 
> > This patch converts the existing power tracer into an event tracer,
> > so that power events (C states and frequency changes) can be tracked
> > via "perf".
> > 
> > This also removes the perl script that was used to demo the tracer;
> > its functionality is being replaced entirely with timechart.
> > 
> 
> And Documentation/power.txt needs update, or just remove it?

remove it; will do
> 
> > Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
> 
> ...
> 
> > diff --git a/kernel/trace/power-traces.c
> > b/kernel/trace/power-traces.c new file mode 100644
> > index 0000000..cb4fc51
> > --- /dev/null
> > +++ b/kernel/trace/power-traces.c
> 
> This file is not necessarily needed.
> 
> You can just add definition of CREATE_TRACE_POINTS in process.c.

hmm it seems existing style to do this in kernel/trace/ though

> > +
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(power_start);
> > +
> 
> I think it's power_frequency that needs to be exported?

very valid point, will fix.

thank you for reviewing the patch; I will send an updated patch out
asap.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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