Ftracing in kernel

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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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