Hi,dev Sorry for not testing by hand ,but I noticed that there is no #define DEFINE_EVENT_MAP_NOARGS() DEFINE_TRACE() in probes/define_trace.h.So is it a missing ?(I have to admit that I am strucky by all these macros ,so if I am wrong,please point it out. ) PS: lttng-moudles version 2.3.0 Thanks zhenyu.ren