test/hotspot/jtreg/gc/nvdimm/TestYoungObjectsOnDram.java
changeset 53116 bb03098c4dde
child 53117 37930c6ba6d7
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/nvdimm/TestYoungObjectsOnDram.java	Fri Dec 21 08:18:59 2018 -0800
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 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.
+ *
+ * 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.
+ */
+
+/*
+ * @test TestYoungObjectsOnDram
+ * @summary Check that objects in young generation reside in dram.
+ * @requires vm.gc=="null"
+ * @library /test/lib
+ * @build sun.hotspot.WhiteBox
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ * @run main TestYoungObjectsOnDram -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                                  -XX:+WhiteBoxAPI
+ */
+
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.Asserts;
+import sun.hotspot.WhiteBox;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Collections;
+
+/**
+ * Test spawns YoungObjectTest in a separate VM and expects that it
+ * completes without a RuntimeException.
+ */
+public class TestYoungObjectsOnDram {
+
+    public static final int ALLOCATION_SIZE = 100;
+    private static ArrayList<String> testOpts;
+
+    public static void main(String args[]) throws Exception {
+        testOpts = new ArrayList();
+
+        String[] common_options = new String[] {
+            "-Xbootclasspath/a:.",
+            "-XX:+UnlockExperimentalVMOptions",
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:+WhiteBoxAPI",
+            "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."),
+            "-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1
+            "-Xms10M", "-Xmx10M",
+            "-XX:InitialTenuringThreshold=15" // avoid promotion of objects to Old Gen
+        };
+
+        String testVmOptsStr = System.getProperty("test.java.opts");
+        if (!testVmOptsStr.isEmpty()) {
+            String[] testVmOpts = testVmOptsStr.split(" ");
+            Collections.addAll(testOpts, testVmOpts);
+        }
+        Collections.addAll(testOpts, common_options);
+
+        // Test with G1 GC
+        runTest("-XX:+UseG1GC");
+    }
+
+    private static void runTest(String... extraFlags) throws Exception {
+        Collections.addAll(testOpts, extraFlags);
+        testOpts.add(YoungObjectTest.class.getName());
+        System.out.println(testOpts);
+
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false,
+                testOpts.toArray(new String[testOpts.size()]));
+
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        System.out.println(output.getStdout());
+        output.shouldHaveExitValue(0);
+    }
+}
+
+/**
+ * This class tests that newly created object is in Young generation and resides in DRAM.
+ * The necessary condition for this test is running in VM with the following flags:
+ * -XX:AllocateOldGenAt=, -XX:InitialTenuringThreshold=15, -XX:SurvivorRatio=1
+ */
+class YoungObjectTest {
+    private static final WhiteBox WB = WhiteBox.getWhiteBox();
+
+    private static void validateYoungObject(Object o) {
+        Asserts.assertTrue(!WB.isObjectInOldGen(o),
+                "Object is supposed to be in YoungGen");
+
+        long youngObj_addr = WB.getObjectAddress(o);
+        long dram_heap_start = WB.dramReservedStart();
+        long dram_heap_end = WB.dramReservedEnd();
+
+        Asserts.assertTrue(youngObj_addr >= dram_heap_start && youngObj_addr <= dram_heap_end,
+                "Young object does not reside in DRAM");
+    }
+
+    public static void main(String args[]) throws Exception {
+        // allocate an object
+        byte[] youngObj = new byte[TestYoungObjectsOnDram.ALLOCATION_SIZE];
+        validateYoungObject(youngObj);
+
+        // Start a Young GC and check that object is still in DRAM.
+        // We have used -XX:InitialTenuringThreshold=15 to invoke this test
+        WB.youngGC();
+        validateYoungObject(youngObj);
+    }
+}