Enable the stats configuration option by default.

INSTALL

@@ -62,8 +62,8 @@ any of the following arguments (not a definitive list) to 'configure':
     Enable assertions and validation code.  This incurs a substantial
     performance hit, but is very useful during application development.
 
---enable-stats
-    Enable statistics gathering functionality.  See the "opt.stats_print"
+--disable-stats
+    Disable statistics gathering functionality.  See the "opt.stats_print"
     option documentation for usage details.
 
 --enable-prof

configure.ac

@@ -423,7 +423,7 @@ if test "x$enable_debug" = "x0" -a "x$no_CFLAGS" = "xyes" ; then
   fi
 fi
 
-dnl Do not enable statistics calculation by default.
+dnl Enable statistics calculation by default.
 AC_ARG_ENABLE([stats],
   [AS_HELP_STRING([--enable-stats], [Enable statistics calculation/reporting])],
 [if test "x$enable_stats" = "xno" ; then
@@ -432,7 +432,7 @@ else
   enable_stats="1"
 fi
 ],
-[enable_stats="0"]
+[enable_stats="1"]
 )
 if test "x$enable_stats" = "x1" ; then
   AC_DEFINE([JEMALLOC_STATS], [ ])
@@ -896,7 +896,6 @@ AC_MSG_RESULT([tcache             : ${enable_tcache}])
 AC_MSG_RESULT([fill               : ${enable_fill}])
 AC_MSG_RESULT([xmalloc            : ${enable_xmalloc}])
 AC_MSG_RESULT([dss                : ${enable_dss}])
-AC_MSG_RESULT([dynamic_page_shift : ${enable_dynamic_page_shift}])
 AC_MSG_RESULT([lazy_lock          : ${enable_lazy_lock}])
 AC_MSG_RESULT([tls                : ${enable_tls}])
 AC_MSG_RESULT([===============================================================================])

src/jemalloc.c

@@ -882,8 +882,6 @@ OOM:
 		}
 		errno = ENOMEM;
 	}
-
-RETURN:
 	if (config_prof && opt_prof && ret != NULL)
 		prof_malloc(ret, usize, cnt);
 	if (config_stats && ret != NULL) {