1 /* 2 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test TestYoungObjectsOnDram 26 * @summary Check that objects in young generation reside in dram. 27 * @requires vm.gc=="null" & os.family != "aix" 28 * @library /test/lib 29 * @build sun.hotspot.WhiteBox 30 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 31 * @run main TestYoungObjectsOnDram -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 32 * -XX:+WhiteBoxAPI 33 */ 34 35 import jdk.test.lib.process.OutputAnalyzer; 36 import jdk.test.lib.process.ProcessTools; 37 import jdk.test.lib.Asserts; 38 import sun.hotspot.WhiteBox; 39 40 import java.util.ArrayList; 41 import java.util.List; 42 import java.util.Collections; 43 44 /** 45 * Test spawns YoungObjectTest in a separate VM and expects that it 46 * completes without a RuntimeException. 47 */ 48 public class TestYoungObjectsOnDram { 49 50 public static final int ALLOCATION_SIZE = 100; 51 private static ArrayList<String> testOpts; 52 53 public static void main(String args[]) throws Exception { 54 testOpts = new ArrayList(); 55 56 String[] common_options = new String[] { 57 "-Xbootclasspath/a:.", 58 "-XX:+UnlockExperimentalVMOptions", 59 "-XX:+UnlockDiagnosticVMOptions", 60 "-XX:+WhiteBoxAPI", 61 "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."), 62 "-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1 63 "-Xms10M", "-Xmx10M", 64 "-XX:InitialTenuringThreshold=15" // avoid promotion of objects to Old Gen 65 }; 66 67 String testVmOptsStr = System.getProperty("test.java.opts"); 68 if (!testVmOptsStr.isEmpty()) { 69 String[] testVmOpts = testVmOptsStr.split(" "); 70 Collections.addAll(testOpts, testVmOpts); 71 } 72 Collections.addAll(testOpts, common_options); 73 74 // Test with G1 GC 75 runTest("-XX:+UseG1GC"); 76 // Test with ParallelOld GC 77 runTest("-XX:+UseParallelOldGC -XX:-UseAdaptiveGCBoundary"); 78 runTest("-XX:+UseParallelOldGC -XX:+UseAdaptiveGCBoundary"); 79 } 80 81 private static void runTest(String... extraFlags) throws Exception { 82 Collections.addAll(testOpts, extraFlags); 83 testOpts.add(YoungObjectTest.class.getName()); 84 System.out.println(testOpts); 85 86 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false, 87 testOpts.toArray(new String[testOpts.size()])); 88 89 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 90 System.out.println(output.getStdout()); 91 output.shouldHaveExitValue(0); 92 } 93 } 94 95 /** 96 * This class tests that newly created object is in Young generation and resides in DRAM. 97 * The necessary condition for this test is running in VM with the following flags: 98 * -XX:AllocateOldGenAt=, -XX:InitialTenuringThreshold=15, -XX:SurvivorRatio=1 99 */ 100 class YoungObjectTest { 101 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 102 103 private static void validateYoungObject(Object o) { 104 Asserts.assertTrue(!WB.isObjectInOldGen(o), 105 "Object is supposed to be in YoungGen"); 106 107 long youngObj_addr = WB.getObjectAddress(o); 108 long dram_heap_start = WB.dramReservedStart(); 109 long dram_heap_end = WB.dramReservedEnd(); 110 111 Asserts.assertTrue(youngObj_addr >= dram_heap_start && youngObj_addr <= dram_heap_end, 112 "Young object does not reside in DRAM"); 113 } 114 115 public static void main(String args[]) throws Exception { 116 // allocate an object 117 byte[] youngObj = new byte[TestYoungObjectsOnDram.ALLOCATION_SIZE]; 118 validateYoungObject(youngObj); 119 120 // Start a Young GC and check that object is still in DRAM. 121 // We have used -XX:InitialTenuringThreshold=15 to invoke this test 122 WB.youngGC(); 123 validateYoungObject(youngObj); 124 } 125 }