[lttng-dev] notrace missing in lttng-ust

[Paul_Woegerer@mentor.com (Woegerer, Paul)]

Hi Mathieu,

libust 0.x uses notrace (__attribute__((no_instrument_function)) for all 
functions that are involved in event emitting.

For example:
./libust/marker.c:122:notrace void __ust_marker_empty_function(const 
struct ust_marker *mdata,
./libust/marker.c:137:notrace void ust_marker_probe_cb(const struct 
ust_marker *mdata,
./libust/marker.c:197:static notrace void 
ust_marker_probe_cb_noarg(const struct ust_marker *mdata,

I just realized that this is no more the case for lttng-ust.
Was it a conscious decision not to use notrace for LTTng 2.0 lttng-ust, 
or is it just missing ?

I would like to have notrace also in lttng-ust, at least for the 
_DECLARE_TRACEPOINT macro in tracepoint.h.
Like this for example:

diff --git a/include/lttng/tracepoint.h b/include/lttng/tracepoint.h
index 5bab476..71665dc 100644
--- a/include/lttng/tracepoint.h
+++ b/include/lttng/tracepoint.h
@@ -137,6 +137,7 @@ extern "C" {

  #define _DECLARE_TRACEPOINT(_provider, _name, ...)     \
  extern struct tracepoint __tracepoint_##_provider##___##_name;         
     \
+static inline void 
__tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) 
__attribute__ ((no_instrument_function));    \
  static inline void 
__tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \
  {                                            \
      struct tracepoint_probe *__tp_probe;                        \
@@ -158,12 +159,16 @@ end:     \
      tp_rcu_read_unlock_bp();                            \
  }                                            \
  static inline void __tracepoint_register_##_provider##___##_name(char 
*name,        \
+        void (*func)(void), void *data) __attribute__ 
((no_instrument_function));    \
+static inline void __tracepoint_register_##_provider##___##_name(char 
*name,        \
          void (*func)(void), void *data) \
  {                                            \
      __tracepoint_probe_register(name, func, data,     \
          __tracepoint_##_provider##___##_name.signature); \
  }                                            \
  static inline void 
__tracepoint_unregister_##_provider##___##_name(char *name,        \
+        void (*func)(void), void *data) __attribute__ 
((no_instrument_function));    \
+static inline void __tracepoint_unregister_##_provider##___##_name(char 
*name,        \
          void (*func)(void), void *data) \
  {                                            \
      __tracepoint_probe_unregister(name, func, data); \

Greetings,
Paul

-- 
Paul Woegerer | SW Development Engineer
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