linux-kernel - Re: [PATCH] ftrace: Add a C-state tracer to help power optimization

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Date:	Sat, 4 Oct 2008 10:32:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ftrace: Add a C-state tracer to help power optimization


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> On Fri, 3 Oct 2008, Arjan van de Ven wrote:
> 
> > On Fri, 3 Oct 2008 20:32:51 -0400 (EDT)
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > 
> > > Hi Arjan,
> > > 
> > > Very nice! I just have a few comments below.
> > 
> > since this is my first tracer.... I would suggest having a "golden
> > example" one that people can copy (it seems I copied a less than
> > perfect one ;-)... maybe a trace_example.c ?
> 
> Yeah, that would make sense to have.  People are starting to come
> up with so many different tracers, I'm not sure what a golden
> example would look like :-/

i think starting with kernel/trace/trace_nop.c is the simplest: copy 
that into a new plugin and make it show up in make oldconfig and make it 
build. Then add ftrace_printk() lines initially - only specialize the 
trace entries to that plugin later on.

	Ingo
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