linux-kernel - Re: dynamic ftrace

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Date:	Fri, 11 Dec 2009 15:40:43 +0100
From:	Michal Simek <monstr@...str.eu>
To:	rostedt@...dmis.org
CC:	wuzhangjin@...il.com, linux-kernel@...r.kernel.org,
	John Williams <john.williams@...alogix.com>
Subject: Re: dynamic ftrace - graph

Steven Rostedt wrote:
> 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 ;-)

yeah. There is one just small hook to recordmcount.pl. :-)

> 
>>>
>>> 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.

we will see. Currently I have small problem only with irqsoff but I 
think this don't have connection with ftrace - only with lockdep I 
think. :-)

Thanks,
Michal

> 
> -- Steve
> 
> 


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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