Ftracing in kernel

Ftracing in kernel

[Erlon Cruz]

Hi folks,

 I've configured my kernel(2.6.35) to support ftrace*. Everything seems to
be ok. After I mounted the debugfs folder I can find all tracing stuffs
there. The problem is not of all functions on my module seems to be listed
in the funtions supported for tracing. In the file *available_filter_functions
*that suppose to list all functions traced, only show 4 or 5 functions of my
module. Does anyone knows why some functions are not listed?

Regards,
Erlon

*CONFIG_FUNCTION_TRACER
CONFIG_FUNCTION_GRAPH_TRACER
CONFIG_STACK_TRACER
CONFIG_DYNAMIC_FTRACE
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Ftracing in kernel

[Mulyadi Santosa]

On Mon, Feb 21, 2011 at 20:34, Erlon Cruz <sombrafam@gmail.com> wrote:
> Hi folks,
> ?I've configured my kernel(2.6.35) to support ftrace*. Everything seems to
> be ok. After I mounted the debugfs folder I can find all tracing stuffs
> there. The problem is not of all functions on my module seems to be listed
> in the funtions supported for tracing. In the
> file?available_filter_functions that suppose to list all functions traced,
> only show 4 or 5 functions of my module. Does anyone knows why some
> functions are not listed?

wild guess, because they are either static or inlined or both?

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

Ftracing in kernel

[Erlon Cruz]

Hmm...interesting guess. I made this change, declaring all functions
as non static and the trace worked on then. Sweet! What made me get
confused is that before this change, some of the functions traced
correctly with ftrace were static.

On Mon, Feb 21, 2011 at 2:29 PM, Mulyadi Santosa
<mulyadi.santosa@gmail.com> wrote:
> On Mon, Feb 21, 2011 at 20:34, Erlon Cruz <sombrafam@gmail.com> wrote:
>> Hi folks,
>> ?I've configured my kernel(2.6.35) to support ftrace*. Everything seems to
>> be ok. After I mounted the debugfs folder I can find all tracing stuffs
>> there. The problem is not of all functions on my module seems to be listed
>> in the funtions supported for tracing. In the
>> file?available_filter_functions that suppose to list all functions traced,
>> only show 4 or 5 functions of my module. Does anyone knows why some
>> functions are not listed?
>
> wild guess, because they are either static or inlined or both?
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>

Ftracing in kernel

[Mulyadi Santosa]

On Tue, Feb 22, 2011 at 01:08, Erlon Cruz <sombrafam@gmail.com> wrote:
> Hmm...interesting guess. I made this change, declaring all functions
> as non static and the trace worked on then. Sweet! What made me get
> confused is that before this change, some of the functions traced
> correctly with ftrace were static.

Congrats :) Well, perhaps it is something related to symbol
lookup...but all in all, it's a good note for all of us.....

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com