--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorStatIntervalTest.java	Wed Jul 18 11:57:51 2018 -0400
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2018, Google and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package MyPackage;
+
+/**
+ * @test
+ * @summary Verifies the JVMTI Heap Monitor sampling interval average.
+ * @build Frame HeapMonitor
+ * @compile HeapMonitorStatIntervalTest.java
+ * @requires vm.compMode != "Xcomp"
+ * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorStatIntervalTest
+ */
+
+public class HeapMonitorStatIntervalTest {
+
+  private native static double getAverageInterval();
+
+  private static boolean testIntervalOnce(int interval, boolean throwIfFailure) {
+    HeapMonitor.resetEventStorage();
+    HeapMonitor.setSamplingInterval(interval);
+
+    HeapMonitor.enableSamplingEvents();
+
+    int allocationTotal = 10 * 1024 * 1024;
+    int allocationIterations = 10;
+
+    double actualCount = 0;
+    for (int i = 0; i < allocationIterations; i++) {
+      HeapMonitor.resetEventStorage();
+      HeapMonitor.allocateSize(allocationTotal);
+      actualCount += HeapMonitor.getEventStorageElementCount();
+    }
+
+    HeapMonitor.disableSamplingEvents();
+
+    double expectedCount = allocationTotal * allocationIterations / interval;
+
+    double error = Math.abs(actualCount - expectedCount);
+    double errorPercentage = error / expectedCount * 100;
+
+    boolean success = (errorPercentage < 10.0);
+
+    if (!success && throwIfFailure) {
+      throw new RuntimeException("Interval average over 10% for interval " + interval + " -> "
+          + actualCount + ", " + expectedCount);
+    }
+
+    return success;
+  }
+
+
+  private static void testInterval(int interval) {
+    // Test the interval twice, it can happen that the test is "unlucky" and the interval just goes above
+    // the 10% mark. So try again to squash flakiness.
+    // Flakiness is due to the fact that this test is dependent on the sampling interval, which is a
+    // statistical geometric variable around the sampling interval. This means that the test could be
+    // unlucky and not achieve the mean average fast enough for the test case.
+    if (!testIntervalOnce(interval, false)) {
+      testIntervalOnce(interval, true);
+    }
+  }
+
+  public static void main(String[] args) {
+    int[] tab = {1024, 8192};
+
+    for (int intervalIdx = 0; intervalIdx < tab.length; intervalIdx++) {
+      testInterval(tab[intervalIdx]);
+    }
+  }
+}