utrace support with label based signature.

configure.ac

@@ -1405,11 +1405,26 @@ JE_COMPILABLE([utrace(2)], [
 	utrace((void *)0, 0);
 ], [je_cv_utrace])
 if test "x${je_cv_utrace}" = "xno" ; then
+  JE_COMPILABLE([utrace(2) with label], [
+  #include <sys/types.h>
+  #include <sys/param.h>
+  #include <sys/time.h>
+  #include <sys/uio.h>
+  #include <sys/ktrace.h>
+  ], [
+	  utrace((void *)0, (void *)0, 0);
+  ], [je_cv_utrace_label])
+  if test "x${je_cv_utrace_label}" = "xno"; then
     enable_utrace="0"
   fi
+  if test "x$enable_utrace" = "x1" ; then
+    AC_DEFINE([JEMALLOC_UTRACE_LABEL], [ ])
+  fi
+else
   if test "x$enable_utrace" = "x1" ; then
     AC_DEFINE([JEMALLOC_UTRACE], [ ])
   fi
+fi
 AC_SUBST([enable_utrace])
 
 dnl Do not support the xmalloc option by default.

include/jemalloc/internal/jemalloc_internal_defs.h.in

@@ -173,6 +173,9 @@
 /* Support utrace(2)-based tracing. */
 #undef JEMALLOC_UTRACE
 
+/* Support utrace(2)-based tracing (label based signature). */
+#undef JEMALLOC_UTRACE_LABEL
+
 /* Support optional abort() on OOM. */
 #undef JEMALLOC_XMALLOC
 

include/jemalloc/internal/jemalloc_preamble.h.in

@@ -4,8 +4,14 @@
 #include "jemalloc_internal_defs.h"
 #include "jemalloc/internal/jemalloc_internal_decls.h"
 
-#ifdef JEMALLOC_UTRACE
+#if defined(JEMALLOC_UTRACE) || defined(JEMALLOC_UTRACE_LABEL)
 #include <sys/ktrace.h>
+#  if defined(JEMALLOC_UTRACE)
+#    define UTRACE_CALL(p, l) utrace(p, l)
+#  else
+#    define UTRACE_CALL(p, l) utrace("jemalloc_process", p, l)
+#    define JEMALLOC_UTRACE
+#  endif
 #endif
 
 #define JEMALLOC_NO_DEMANGLE

src/jemalloc.c

@@ -250,7 +250,7 @@ typedef struct {
 		ut.p = (a);						\
 		ut.s = (b);						\
 		ut.r = (c);						\
-		utrace(&ut, sizeof(ut));				\
+		UTRACE_CALL(&ut, sizeof(ut));				\
 		errno = utrace_serrno;					\
 	}								\
 } while (0)