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ifeq ($(CONFIG_DEBUG_TRACE),y)
EXCLUDEFILENAME = trace_exclude_files.txt
EXCLUDEFUNCNAME = trace_exclude_functions.txt
EXCLUDEFILES := $(shell for file in `cat $(EXCLUDEFILENAME)`; do echo -n $$file, ; done)
EXCLUDEFUNCS := $(shell for func in `cat $(EXCLUDEFUNCNAME)`; do echo -n $$func, ; done)
CFLAGS += -finstrument-functions
ifneq ($(EXCLUDEFILES), )
CFLAGS += -finstrument-functions-exclude-file-list='$(EXCLUDEFILES)'
endif
ifneq ($(EXCLUDEFUNCS), )
CFLAGS += -finstrument-functions-exclude-function-list='$(EXCLUDEFUNCS)'
endif
endif

The functions defined in the files this Makefile will compile will be instrumented.

You can add the file names list that are excluded from trace instrumentation to trace_exclude_files.txt like below.

tal/src/tal_buffer.c
tal_semaphore.c

And function names list that are excluded from tracing to trace_exclude_functions.txt like below.

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TAL_get_instance() and the functions beginning with “IFD_“ will not be tracedinstrumented.

3. Add syslog to profiling functions in your APP.

Because syslog mask is 2 in config, the priority of syslog shoule be LOG_CRIT here. The priority value should <= logmask. Add below code in your application. For example, we add once below code is added in k81start.c, above gcc option in is added to idtapps/neo3/idt_apps/k81_reader/Makefile and idtapps/neo3/idt_apps/k81_system/Makefile, trace log will be output with all user functions defined in the path idtapps/neo3/idt_apps/k81_reader and k81_system if trace_exclude_files.txt or trace_exclude_functions.txt is not created or empty.

#ifdef CONFIG_DEBUG_TRACE
void __attribute__((__no_instrument_function__))
__cyg_profile_func_enter(void *this_func, void *call_site)
{
    syslog(LOG_CRIT, "[Start].%p\n", this_func);
}

void __attribute__((__no_instrument_function__))
__cyg_profile_func_exit(void *this_func, void *call_site)
{
    syslog(LOG_CRIT, "[End].%p\n", this_func);
}
#endif

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