--- old/test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorStatRateTest.java	2018-03-21 10:34:16.823160155 -0700
+++ new/test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorStatRateTest.java	2018-03-21 10:34:16.519161196 -0700
@@ -38,6 +38,8 @@
   public static void main(String[] args) {
     int[] tab = {1024, 16384, 524288};
 
+    HeapMonitor.enableSamplingEvents();
+
     for (int rateIdx = 0; rateIdx < tab.length; rateIdx++) {
       int rate = tab[rateIdx];