--- a/make/autoconf/hotspot.m4	Tue May 15 11:28:29 2018 -0700
+++ b/make/autoconf/hotspot.m4	Tue May 15 20:24:34 2018 +0200
@@ -26,7 +26,7 @@
 # All valid JVM features, regardless of platform
 VALID_JVM_FEATURES="compiler1 compiler2 zero minimal dtrace jvmti jvmci \
     graal vm-structs jni-check services management cmsgc g1gc parallelgc serialgc nmt cds \
-    static-build link-time-opt aot"
+    static-build link-time-opt aot jfr"
 
 # All valid JVM variants
 VALID_JVM_VARIANTS="server client minimal core zero custom"
@@ -309,6 +309,11 @@
     AC_MSG_ERROR([Specified JVM feature 'cmsgc' requires feature 'serialgc'])
   fi
 
+  # Enable JFR by default, except on linux-sparcv9 and on minimal.
+  if test "x$OPENJDK_TARGET_OS" != xlinux || test "x$OPENJDK_TARGET_CPU" != xsparcv9; then
+    NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES jfr"
+  fi
+
   # Turn on additional features based on other parts of configure
   if test "x$INCLUDE_DTRACE" = "xtrue"; then
     JVM_FEATURES="$JVM_FEATURES dtrace"
@@ -396,7 +401,7 @@
     NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES cds"
   fi
 
-  # Enable default features depending on variant.
+  # Enable features depending on variant.
   JVM_FEATURES_server="compiler1 compiler2 $NON_MINIMAL_FEATURES $JVM_FEATURES $JVM_FEATURES_jvmci $JVM_FEATURES_aot $JVM_FEATURES_graal"
   JVM_FEATURES_client="compiler1 $NON_MINIMAL_FEATURES $JVM_FEATURES $JVM_FEATURES_jvmci"
   JVM_FEATURES_core="$NON_MINIMAL_FEATURES $JVM_FEATURES"