trace__fprintf_entry_head
printed = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);
trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);
trace__fprintf_entry_head(trace, thread, 0, true, sample->time, trace->output);