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-rw-r--r--erts/emulator/beam/beam_load.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/erts/emulator/beam/beam_load.h b/erts/emulator/beam/beam_load.h
index 5f0f34fcdd..43cf6597df 100644
--- a/erts/emulator/beam/beam_load.h
+++ b/erts/emulator/beam/beam_load.h
@@ -151,10 +151,16 @@ struct BeamCodeLineTab_ {
#define LOC_FILE(Loc) ((Loc) >> 24)
#define LOC_LINE(Loc) ((Loc) & ((1 << 24)-1))
-#ifdef DEBUG
-# define ENABLE_DBG_TRACE_MFA
-#endif
+/*
+ * MFA event debug "tracing" usage:
+ *
+ * #define ENABLE_DBG_TRACE_MFA
+ * call dbg_set_traced_mfa("mymod","myfunc",arity)
+ * for the function(s) to trace, in some init function.
+ *
+ * Run and get stderr printouts when interesting things happen to your MFA.
+ */
#ifdef ENABLE_DBG_TRACE_MFA
void dbg_set_traced_mfa(const char* m, const char* f, Uint a);