a short script for static function call tracing

[Masami Hiramatsu]

Hi,

Here is a short script for static function call tracing.
Note: currently, this may shows some(or many) false positives.

this is based on cscope, so before using, in kernel tree,

$ make cscope

and

$ ./trace_symbols a_symbol

For example)
$ ./trace_symbols relay_switch_subbuf
(output thousands of functions...)

To avoid tracing unneeded path, you can add IGNORE symbols

For example)
$ IGNORE="__mod_timer" ./trace_symbols relay_switch_subbuf

__mod_timer
BUG
BUG_ON
unlikely
likely
__acquires
__releases
__volatile__
__attribute__
asm
alternative
defined
__asm__
 --- above symbols are ignored  ---
relay_switch_subbuf is calling __mod_timer smp_mb subbuf_start unlikely waitqueue_active
smp_mb is calling barrier mb
barrier is calling __memory_barrier __volatile__
__memory_barrier is calling
mb is calling alternative
subbuf_start is calling
waitqueue_active is calling list_empty
list_empty is calling

Total: 7 symbols are called from relay_switch_subbuf

This means relay_switch_subbuf itself is a very simple function, but __mod_timer
may call many functions...

Thanks,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com

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