Add utrace(2)-based tracing (--enable-utrace).

include/jemalloc/internal/jemalloc_internal.h.in

@@ -36,6 +36,10 @@
 #define	JEMALLOC_NO_DEMANGLE
 #include "../jemalloc@install_suffix@.h"
 
+#ifdef JEMALLOC_UTRACE
+#include <sys/ktrace.h>
+#endif
+
 #include "jemalloc/internal/private_namespace.h"
 
 #ifdef JEMALLOC_CC_SILENCE
@@ -114,6 +118,13 @@ static const bool config_tls =
     false
 #endif
     ;
+static const bool config_utrace =
+#ifdef JEMALLOC_UTRACE
+    true
+#else
+    false
+#endif
+    ;
 static const bool config_xmalloc =
 #ifdef JEMALLOC_XMALLOC
     true
@@ -332,6 +343,7 @@ typedef struct {
 
 extern bool	opt_abort;
 extern bool	opt_junk;
+extern bool	opt_utrace;
 extern bool	opt_xmalloc;
 extern bool	opt_zero;
 extern size_t	opt_narenas;

include/jemalloc/internal/private_namespace.h

@@ -173,6 +173,7 @@
 #define	opt_prof_leak JEMALLOC_N(opt_prof_leak)
 #define	opt_stats_print JEMALLOC_N(opt_stats_print)
 #define	opt_tcache JEMALLOC_N(opt_tcache)
+#define	opt_utrace JEMALLOC_N(opt_utrace)
 #define	opt_xmalloc JEMALLOC_N(opt_xmalloc)
 #define	opt_zero JEMALLOC_N(opt_zero)
 #define	pow2_ceil JEMALLOC_N(pow2_ceil)

include/jemalloc/jemalloc_defs.h.in

@@ -154,6 +154,9 @@
 /* Support the experimental API. */
 #undef JEMALLOC_EXPERIMENTAL
 
+/* Support utrace(2)-based tracing. */
+#undef JEMALLOC_UTRACE
+
 /* Support optional abort() on OOM. */
 #undef JEMALLOC_XMALLOC