--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/serviceability/tmtools/jstat/utils/GcProvokerImpl.java	Thu Jan 14 15:35:21 2016 +0300
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2015, Oracle 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 utils;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryPoolMXBean;
+import java.lang.management.MemoryUsage;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * Utilities to provoke GC in various ways
+ */
+public class GcProvokerImpl implements GcProvoker {
+
+    private static List<Object> eatenMetaspace;
+    private static List<Object> eatenMemory;
+
+    static List<Object> eatHeapMemory(float targetUsage) {
+        long maxMemory = Runtime.getRuntime().maxMemory();
+        // uses fixed small objects to avoid Humongous objects allocation in G1
+        int memoryChunk = 2048;
+        List<Object> list = new ArrayList<>();
+        float used = 0;
+        while (used < targetUsage * maxMemory) {
+            try {
+                list.add(new byte[memoryChunk]);
+                used += memoryChunk;
+            } catch (OutOfMemoryError e) {
+                list = null;
+                throw new RuntimeException("Unexpected OOME while eating " + targetUsage + " of heap memory.");
+            }
+        }
+        return list;
+    }
+
+    @Override
+    public void provokeGc() {
+        for (int i = 0; i < 3; i++) {
+            long edenSize = Pools.getEdenCommittedSize();
+            long heapSize = Pools.getHeapCommittedSize();
+            float targetPercent = ((float) edenSize) / (heapSize);
+            if ((targetPercent <= 0) || (targetPercent > 1.0)) {
+                throw new RuntimeException("Error in the percent calculation" + " (eden size: " + edenSize + ", heap size: " + heapSize + ", calculated eden percent: " + targetPercent + ")");
+            }
+            eatHeapMemory(targetPercent);
+            eatHeapMemory(targetPercent);
+            System.gc();
+        }
+    }
+
+    @Override
+    public void eatMetaspaceAndHeap(float targetMemoryUsagePercent) {
+        eatenMemory = eatHeapMemory(targetMemoryUsagePercent);
+        eatenMetaspace = eatMetaspace(targetMemoryUsagePercent);
+    }
+
+    private static List<Object> eatMetaspace(float targetUsage) {
+        List<Object> list = new ArrayList<>();
+        final String metaspacePoolName = "Metaspace";
+        MemoryPoolMXBean metaspacePool = null;
+        for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
+            if (pool.getName().contains(metaspacePoolName)) {
+                metaspacePool = pool;
+                break;
+            }
+        }
+        if (metaspacePool == null) {
+            throw new RuntimeException("MXBean for Metaspace pool wasn't found");
+        }
+        float currentUsage;
+        GeneratedClassProducer gp = new GeneratedClassProducer();
+        do {
+            try {
+                list.add(gp.create(0));
+            } catch (OutOfMemoryError oome) {
+                list = null;
+                throw new RuntimeException("Unexpected OOME while eating " + targetUsage + " of Metaspace.");
+            }
+            MemoryUsage memoryUsage = metaspacePool.getUsage();
+            currentUsage = (((float) memoryUsage.getUsed()) / memoryUsage.getMax());
+        } while (currentUsage < targetUsage);
+        return list;
+    }
+
+    public GcProvokerImpl() {
+    }
+
+}