[lttng-dev] lttng function tracing nginx problem

[gang li]

hi all,
I compile the nginx-1.4.7 with FLAG -finstrument-functions , and start nginx like this:








LD_PRELOAD=liblttng-ust-cyg-profile-fast.so  ./nginx
Then I use the command lttng list --userspace and got nothing like this:
UST events:-------------









None
I don't understand why I can't get the func_exit/entry events from nginx.
By the way, I test function tracing with a single c source file and works well, output like this:
UST events:-------------
PID: 4687 - Name: ./tt      lttng_ust_cyg_profile:func_exit (loglevel: TRACE_DEBUG_FUNCTION (12)) (type: tracepoint)      lttng_ust_cyg_profile:func_entry (loglevel: TRACE_DEBUG_FUNCTION (12)) (type: tracepoint)      lttng_ust_tracef:event (loglevel: TRACE_DEBUG (14)) (type: tracepoint)














      ust_baddr_statedump:soinfo (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)

Wishing for help.















 		 	   		  
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