1 /* 2 * Copyright (c) 2018 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 * @library /test/lib 28 * @build sun.hotspot.WhiteBox 29 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 30 * @run main TestYoungObjectsOnDram -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 31 * -XX:+WhiteBoxAPI 32 */ 33 34 import jdk.test.lib.process.OutputAnalyzer; 35 import jdk.test.lib.process.ProcessTools; 36 import jdk.test.lib.Asserts; 37 import sun.hotspot.WhiteBox; 38 39 import java.util.ArrayList; 40 import java.util.List; 41 import java.util.Collections; 42 43 /** 44 * Test spawns YoungObjectTest in a separate VM and expects that it 45 * completes without a RuntimeException. 46 */ 47 public class TestYoungObjectsOnDram { 48 49 public static final int ALLOCATION_SIZE = 100; 50 private static ArrayList<String> testOpts; 51 52 public static void main(String args[]) throws Exception { 53 testOpts = new ArrayList(); 54 55 String[] common_options = new String[] { 56 "-Xbootclasspath/a:.", 57 "-XX:+UnlockExperimentalVMOptions", 58 "-XX:+UnlockDiagnosticVMOptions", 59 "-XX:+WhiteBoxAPI", 60 "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."), 61 "-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1 62 "-Xms10M", "-Xmx10M", 63 "-XX:InitialTenuringThreshold=15" // avoid promotion of objects to Old Gen 64 }; 65 66 String testVmOptsStr = System.getProperty("test.java.opts"); 67 if (!testVmOptsStr.isEmpty()) { 68 String[] testVmOpts = testVmOptsStr.split(" "); 69 Collections.addAll(testOpts, testVmOpts); 70 } 71 Collections.addAll(testOpts, common_options); 72 73 // Test with G1 GC 74 runTest("-XX:+UseG1GC"); 75 // Test with ParallelOld GC 76 //runTest("-XX:+UseParallelOldGC"); 77 } 78 79 private static void runTest(String... extraFlags) throws Exception { 80 Collections.addAll(testOpts, extraFlags); 81 testOpts.add(YoungObjectTest.class.getName()); 82 System.out.println(testOpts); 83 84 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false, 85 testOpts.toArray(new String[testOpts.size()])); 86 87 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 88 System.out.println(output.getStdout()); 89 output.shouldHaveExitValue(0); 90 } 91 } 92 93 /** 94 * This class tests that newly created object is in Young generation and resides in DRAM. 95 * The necessary condition for this test is running in VM with the following flags: 96 * -XX:AllocateOldGenAt=, -XX:InitialTenuringThreshold=15, -XX:SurvivorRatio=1 97 */ 98 class YoungObjectTest { 99 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 100 101 private static void validateYoungObject(Object o) { 102 Asserts.assertTrue(!WB.isObjectInOldGen(o), 103 "Object is supposed to be in YoungGen"); 104 105 long youngObj_addr = WB.getObjectAddress(o); 106 long dram_heap_start = WB.g1DramReservedStart(); 107 long dram_heap_end = WB.g1DramReservedEnd(); 108 109 Asserts.assertTrue(youngObj_addr >= dram_heap_start && youngObj_addr <= dram_heap_end, 110 "Young object does not reside in DRAM"); 111 } 112 113 public static void main(String args[]) throws Exception { 114 // allocate an object 115 byte[] youngObj = new byte[TestYoungObjectsOnDram.ALLOCATION_SIZE]; 116 validateYoungObject(youngObj); 117 118 // Start a Young GC and check that object is still in DRAM. 119 // We have used -XX:InitialTenuringThreshold=15 to invoke this test 120 WB.youngGC(); 121 validateYoungObject(youngObj); 122 } 123 }