1 /* 2 * Copyright (c) 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 package gc.arguments; 25 26 /* 27 * @test TestMaxRAMFlags 28 * @key gc 29 * @bug 8222252 30 * @summary Verify correct MaxHeapSize and UseCompressedOops when MaxRAM and MaxRAMPercentage 31 * are specified. 32 * @library /test/lib 33 * @library / 34 * @requires vm.bits == "64" 35 * @modules java.base/jdk.internal.misc 36 * java.management 37 * @build sun.hotspot.WhiteBox 38 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 39 * sun.hotspot.WhiteBox$WhiteBoxPermission 40 * @run main gc.arguments.TestMaxRAMFlags 41 * @author bob.vandette@oracle.com 42 */ 43 44 import java.util.regex.Matcher; 45 import java.util.regex.Pattern; 46 47 import java.util.ArrayList; 48 import java.util.Arrays; 49 50 import jdk.test.lib.process.OutputAnalyzer; 51 import jdk.test.lib.process.ProcessTools; 52 53 public class TestMaxRAMFlags { 54 checkMaxRAMSize(long maxram, int maxrampercent, boolean forcecoop, long expectheap, boolean expectcoop)55 private static void checkMaxRAMSize(long maxram, int maxrampercent, boolean forcecoop, long expectheap, boolean expectcoop) throws Exception { 56 57 ArrayList<String> args = new ArrayList<String>(); 58 args.add("-XX:MaxRAM=" + maxram); 59 args.add("-XX:MaxRAMPercentage=" + maxrampercent); 60 if (forcecoop) { 61 args.add("-XX:+UseCompressedOops"); 62 } 63 64 args.add("-XX:+PrintFlagsFinal"); 65 args.add("-version"); 66 67 ProcessBuilder pb = GCArguments.createJavaProcessBuilder(args.toArray(new String[0])); 68 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 69 output.shouldHaveExitValue(0); 70 String stdout = output.getStdout(); 71 72 long actualheap = new Long(getFlagValue("MaxHeapSize", stdout)).longValue(); 73 if (actualheap != expectheap) { 74 throw new RuntimeException("MaxHeapSize value set to " + actualheap + 75 ", expected " + expectheap + " when running with the following flags: " + Arrays.asList(args).toString()); 76 } 77 78 boolean actualcoop = getFlagBoolValue("UseCompressedOops", stdout); 79 if (actualcoop != expectcoop) { 80 throw new RuntimeException("UseCompressedOops set to " + actualcoop + 81 ", expected " + expectcoop + " when running with the following flags: " + Arrays.asList(args).toString()); 82 } 83 } 84 getHeapBaseMinAddress()85 private static long getHeapBaseMinAddress() throws Exception { 86 ArrayList<String> args = new ArrayList<String>(); 87 args.add("-XX:+PrintFlagsFinal"); 88 args.add("-version"); 89 90 ProcessBuilder pb = GCArguments.createJavaProcessBuilder(args.toArray(new String[0])); 91 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 92 output.shouldHaveExitValue(0); 93 String stdout = output.getStdout(); 94 return (new Long(getFlagValue("HeapBaseMinAddress", stdout)).longValue()); 95 } 96 getFlagValue(String flag, String where)97 private static String getFlagValue(String flag, String where) { 98 Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where); 99 if (!m.find()) { 100 throw new RuntimeException("Could not find value for flag " + flag + " in output string"); 101 } 102 String match = m.group(); 103 return match.substring(match.lastIndexOf(" ") + 1, match.length()); 104 } 105 getFlagBoolValue(String flag, String where)106 private static boolean getFlagBoolValue(String flag, String where) { 107 Matcher m = Pattern.compile(flag + "\\s+:?= (true|false)").matcher(where); 108 if (!m.find()) { 109 throw new RuntimeException("Could not find value for flag " + flag + " in output string"); 110 } 111 return m.group(1).equals("true"); 112 } 113 main(String args[])114 public static void main(String args[]) throws Exception { 115 // Tests 116 // 1. Verify that MaxRAMPercentage overrides UseCompressedOops Ergo 117 // 2. Verify that UseCompressedOops forces compressed oops limit even 118 // when other flags are specified. 119 120 long oneG = 1L * 1024L * 1024L * 1024L; 121 122 // Hotspot startup logic reduces MaxHeapForCompressedOops by HeapBaseMinAddress 123 // in order to get zero based compressed oops offsets. 124 long heapbaseminaddr = getHeapBaseMinAddress(); 125 long maxcoopheap = TestUseCompressedOopsErgoTools.getMaxHeapForCompressedOops(new String [0]) - heapbaseminaddr; 126 127 // Args: MaxRAM , MaxRAMPercentage, forcecoop, expect heap, expect coop 128 checkMaxRAMSize(maxcoopheap - oneG, 100, false, maxcoopheap - oneG, true); 129 checkMaxRAMSize(maxcoopheap + oneG, 100, false, maxcoopheap + oneG, false); 130 checkMaxRAMSize(maxcoopheap + oneG, 100, true, maxcoopheap, true); 131 } 132 } 133