[RFC] ftrace: support tracing functions in one module

[Ming Lei]

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?

Thanks,
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