linux-kernel - Re: dynamic ftrace

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Message-ID: <1260542255.2146.350.camel@gandalf.stny.rr.com>
Date:	Fri, 11 Dec 2009 09:37:35 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	monstr@...str.eu
Cc:	wuzhangjin@...il.com, linux-kernel@...r.kernel.org,
	John Williams <john.williams@...alogix.com>
Subject: Re: dynamic ftrace - graph

On Fri, 2009-12-11 at 08:29 +0100, Michal Simek wrote:
> Steven Rostedt wrote:
> > Hi Michal,
> > 
> > Sorry for such a late reply, you sent this email to me at the worst
> > time. My wife was having shoulder surgery and I heading for a
> > conference. I fell very far behind in email and I only now just noticed
> > this.
> 
> No problem. I prepared Microblaze ftrace patches. You can find them in 
> linux-next. I am going to send pull request to Linus soon that's why if 
> you have any your comments please let me know.
> 

Hey, if they work and they are only in your arch, then I'm fine with
them ;-)

> > 
> > 
> > I'll answer these ever though you may already figured it out.
> > 
> > On Mon, 2009-11-09 at 17:52 +0100, Michal Simek wrote:
> >> Hi Steve and others,
> >>
> >> I have working dynamic ftrace function. :-)
> >>
> >> I look at __ftrace_modify_code function and I have one question about.
> >> Below are function which are called when I enable function_graph.
> >>
> >> I personally think that make more sense to call 
> >> ftrace_enable_ftrace_graph_caller before ftrace_update_ftrace_func.
> >> The reason for it is that graph_caller enable calling graph tracing 
> >> which should be setup before ftrace_update_ftrace_func which enable 
> >> whole tracing function.
> > 
> > Have you seen any difference in output with this?
> 
> I haven't tested it. It was just suggestion. I don't know if is relevant 
> or not.

I'm not sure it is relevant. Those are enabled in stop_machine so the
only thing you would be missing is the tracer enabling itself.

-- Steve


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