Ftrace: tracing init call of out of tree modules

[Jay Aurabind]

Hi,

I am learning ftrace. I would like to know to use frace filters for
tracing a module's init function.

For example, assume the module uvcvideo. While the module is loaded,

cat available_filter_functions | grep uvcvideo

will give me a big list of functions. Then I enable those functions by
setting ftrace filter with:

echo "uvc*" > set_ftrace_filter

However, as soon as I rmmod the driver, set_ftrace_filter becomes
empty automatically.

So how do I do a trace on out-of-tree modules I have ?


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Thanks and Regards,
Aurabindo J