--- /dev/null	2017-03-29 12:42:18.512049647 +0200
+++ new/test/gc/stress/systemgc/TestSystemGC.java	2017-04-05 08:44:29.388334131 +0200
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.TreeMap;
+
+final class ThreadUtils {
+    public static void sleep(long durationMS) {
+        try {
+            Thread.sleep(durationMS);
+        } catch (Exception e) {
+        }
+    }
+}
+
+class Exitable {
+    private volatile boolean shouldExit = false;
+
+    protected boolean shouldExit() {
+        return shouldExit;
+    }
+
+    public void exit() {
+        shouldExit = true;
+    }
+}
+
+class ShortLivedAllocationTask extends Exitable implements Runnable {
+    private Map<String, String> map = new HashMap<>();
+
+    @Override
+    public void run() {
+        map = new HashMap<>();
+        while (!shouldExit()) {
+            for (int i = 0; i < 200; i++) {
+                String key = "short" + " key = " + i;
+                String value = "the value is " + i;
+                map.put(key, value);
+            }
+        }
+    }
+}
+
+class LongLivedAllocationTask extends Exitable implements Runnable {
+    private Map<String, String> map;
+
+    LongLivedAllocationTask(Map<String, String> map) {
+        this.map = map;
+    }
+
+    @Override
+    public void run() {
+        while (!shouldExit()) {
+            String prefix = "long" + System.currentTimeMillis();
+            for (int i = 0; i < 10; i++) {
+                String key = prefix + " key = " + i;
+                String value = "the value is " + i;
+                map.put(key, value);
+            }
+        }
+    }
+}
+
+class SystemGCTask extends Exitable implements Runnable {
+    private long delayMS;
+
+    SystemGCTask(long delayMS) {
+        this.delayMS = delayMS;
+    }
+
+    @Override
+    public void run() {
+        while (!shouldExit()) {
+            System.gc();
+            ThreadUtils.sleep(delayMS);
+        }
+    }
+}
+
+public class TestSystemGC {
+    private static final int numGroups = 7;
+    private static final int numGCsPerGroup = 4;
+
+    private static Map<String, String> longLivedMap = new TreeMap<>();
+
+    private static void populateLongLived() {
+        for (int i = 0; i < 1000000; i++) {
+            String key = "all" + " key = " + i;
+            String value = "the value is " + i;
+            longLivedMap.put(key, value);
+        }
+    }
+
+    private static long getDelayMS(int group) {
+        if (group == 0) {
+            return 0;
+        }
+
+        int res = 16;
+        for (int i = 0; i < group; i++) {
+            res *= 2;
+        }
+        return res;
+    }
+
+    private static void doSystemGCs() {
+        ThreadUtils.sleep(1000);
+
+        for (int i = 0; i < numGroups; i++) {
+            for (int j = 0; j < numGCsPerGroup; j++) {
+                System.gc();
+                ThreadUtils.sleep(getDelayMS(i));
+            }
+        }
+    }
+
+    private static SystemGCTask createSystemGCTask(int group) {
+        long delay0 = getDelayMS(group);
+        long delay1 = getDelayMS(group + 1);
+        long delay = delay0 + (delay1 - delay0) / 2;
+        return new SystemGCTask(delay);
+    }
+
+    private static void startTask(Runnable task) {
+        if (task != null) {
+            new Thread(task).start();
+        }
+    }
+
+    private static void exitTask(Exitable task) {
+        if (task != null) {
+            task.exit();
+        }
+    }
+
+    private static void runAllPhases() {
+        for (int i = 0; i < 4; i++) {
+            SystemGCTask gcTask =
+                (i % 2 == 1) ? createSystemGCTask(numGroups / 3) : null;
+            ShortLivedAllocationTask shortTask =
+                (i == 1 || i == 3) ?  new ShortLivedAllocationTask() : null;
+            LongLivedAllocationTask longTask =
+                (i == 2 || i == 3) ? new LongLivedAllocationTask(longLivedMap) : null;
+
+            startTask(gcTask);
+            startTask(shortTask);
+            startTask(longTask);
+
+            doSystemGCs();
+
+            exitTask(gcTask);
+            exitTask(shortTask);
+            exitTask(longTask);
+
+            ThreadUtils.sleep(1000);
+        }
+    }
+
+    public static void main(String[] args) {
+        populateLongLived();
+        runAllPhases();
+        runAllPhases();
+    }
+}