Re: [RFC] ftrace: support tracing functions in one module

From: Steven Rostedt
Date: Sun Aug 03 2008 - 10:45:26 EST



On Sun, 3 Aug 2008, Ming Lei wrote:

> Hi,
>
> IMO, ftrace is a very good tools, which can monitor almost all
> functions calling
> in the running kernel. The traced result is very complete and intact.
> But it seems
> too large to grasp the interested content. For example, one may only
> have interest in
> functions calling in usbcore.ko, but he must trace all the functions
> calling in the
> kernel, so the tracing result is too large to use it.
>
> Could you add the support of tracing functions in one module only to ftrace?

Look at the set_ftrace_filter in ftrace.txt. You can pick and choose which
functions to trace. All the functions that can be traced is in
available_filter_functions in the debugfs/tracing directory.

Note, the functions must execute at least once before they can be
recorded.

-- Steve

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