--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/jcmd/TestJcmdDumpPathToGCRoots.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2015, 2018, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 jdk.jfr.jcmd;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import jdk.jfr.Enabled;
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.jfr.consumer.RecordedObject;
+import jdk.jfr.consumer.RecordingFile;
+import jdk.jfr.internal.test.WhiteBox;
+import jdk.test.lib.jfr.EventNames;
+
+/*
+ * @test
+ * @summary Start a recording with or without path-to-gc-roots
+ * @modules jdk.jfr/jdk.jfr.internal.test
+ * @library /test/lib /test/jdk
+ * @key jfr
+ *
+ * @run main/othervm -XX:TLABSize=2k jdk.jfr.jcmd.TestJcmdDumpPathToGCRoots
+ */
+public class TestJcmdDumpPathToGCRoots {
+
+    private static final int OBJECT_COUNT = 100_000;
+    public static List<Object[]> leak = new ArrayList<>(OBJECT_COUNT);
+
+    public static void main(String[] args) throws Exception {
+        WhiteBox.setWriteAllObjectSamples(true);
+
+        String settingName = EventNames.OldObjectSample + "#" + "cutoff";
+
+        // dump parameter trumps previous setting
+        testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "infinity"), true);
+        testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "0 ns"), true);
+        testDump("path-to-gc-roots=true", Collections.emptyMap(), true);
+
+        testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "infinity"), false);
+        testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "0 ns"), false);
+        testDump("path-to-gc-roots=false", Collections.emptyMap(), false);
+
+        testDump("", Collections.singletonMap(settingName, "infinity"), true);
+        testDump("", Collections.singletonMap(settingName, "0 ns"), false);
+        testDump("", Collections.emptyMap(), false);
+    }
+
+    private static void testDump(String pathToGcRoots, Map<String, String> settings, boolean expectedChains) throws Exception {
+        try (Recording r = new Recording()) {
+            Map<String, String> p = new HashMap<>(settings);
+            p.put(EventNames.OldObjectSample + "#" + Enabled.NAME, "true");
+            r.setName("dodo");
+            r.setSettings(p);
+            r.setToDisk(true);
+            r.start();
+            clearLeak();
+            System.out.println("Recording id: " + r.getId());
+            System.out.println("Settings: " + settings.toString());
+            System.out.println("Command: JFR.dump " + pathToGcRoots);
+            System.out.println("Chains expected: " + expectedChains);
+            buildLeak();
+            System.gc();
+            System.gc();
+            File recording = new File("TestJcmdDumpPathToGCRoots" + r.getId() + ".jfr");
+            recording.delete();
+            JcmdHelper.jcmd("JFR.dump", "name=dodo", pathToGcRoots, "filename=" + recording.getAbsolutePath());
+            r.setSettings(Collections.emptyMap());
+            List<RecordedEvent> events = RecordingFile.readAllEvents(recording.toPath());
+            if (events.isEmpty()) {
+                throw new Exception("No events found in recoding");
+            }
+            boolean chains = hasChains(events);
+            if (expectedChains && !chains) {
+                System.out.println(events);
+                throw new Exception("Expected chains but found none");
+            }
+            if (!expectedChains && chains) {
+                System.out.println(events);
+                throw new Exception("Didn't expect chains but found some");
+            }
+        }
+    }
+
+    private static void clearLeak() {
+      leak.clear();
+    }
+
+    private static boolean hasChains(List<RecordedEvent> events) throws IOException {
+        for (RecordedEvent e : events) {
+            RecordedObject ro = e.getValue("object");
+            if (ro.getValue("referrer") != null) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static void buildLeak() {
+        for (int i = 0; i < OBJECT_COUNT;i ++) {
+            leak.add(new Object[0]);
+        }
+    }
+}