1 /* 2 * Copyright (c) 2014, 2017, 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 SpaceUtilizationCheck 26 * @requires vm.cds 27 * @summary Check if the space utilization for shared spaces is adequate 28 * @requires (vm.opt.UseCompressedOops == null) | (vm.opt.UseCompressedOops == true) 29 * @library /test/lib 30 * @modules java.base/jdk.internal.misc 31 * java.management 32 * @build sun.hotspot.WhiteBox 33 * @run main ClassFileInstaller sun.hotspot.WhiteBox 34 * sun.hotspot.WhiteBox$WhiteBoxPermission 35 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI SpaceUtilizationCheck 36 */ 37 38 import jdk.test.lib.cds.CDSTestUtils; 39 import jdk.test.lib.process.OutputAnalyzer; 40 import sun.hotspot.WhiteBox; 41 42 import java.util.regex.Pattern; 43 import java.util.regex.Matcher; 44 import java.util.ArrayList; 45 import java.util.Hashtable; 46 import java.lang.Integer; 47 48 public class SpaceUtilizationCheck { 49 // [1] Each region must have strictly less than 50 // WhiteBox.metaspaceReserveAlignment() bytes of unused space. 51 // [2] There must be no gap between two consecutive regions. 52 53 public static void main(String[] args) throws Exception { 54 // (1) Default VM arguments 55 test(); 56 57 // (2) Use the now deprecated VM arguments. They should have no effect. 58 test("-XX:SharedReadWriteSize=128M", 59 "-XX:SharedReadOnlySize=128M", 60 "-XX:SharedMiscDataSize=128M", 61 "-XX:SharedMiscCodeSize=128M"); 62 } 63 64 static void test(String... extra_options) throws Exception { 65 OutputAnalyzer output = CDSTestUtils.createArchive(extra_options); 66 CDSTestUtils.checkDump(output); 67 Pattern pattern = Pattern.compile("^(..) space: *([0-9]+).* out of *([0-9]+) bytes .* at 0x([0-9a0-f]+)"); 68 WhiteBox wb = WhiteBox.getWhiteBox(); 69 long reserve_alignment = wb.metaspaceReserveAlignment(); 70 System.out.println("Metaspace::reserve_alignment() = " + reserve_alignment); 71 72 long last_region = -1; 73 Hashtable<String,String> checked = new Hashtable<>(); 74 for (String line : output.getStdout().split("\n")) { 75 if (line.contains(" space:") && !line.contains("st space:")) { 76 Matcher matcher = pattern.matcher(line); 77 if (matcher.find()) { 78 String name = matcher.group(1); 79 if (name.equals("s0") || name.equals("s1")) { 80 // String regions are listed at the end and they may not be fully occupied. 81 break; 82 } else { 83 System.out.println("Checking " + name + " in : " + line); 84 checked.put(name, name); 85 } 86 long used = Long.parseLong(matcher.group(2)); 87 long capacity = Long.parseLong(matcher.group(3)); 88 long address = Long.parseLong(matcher.group(4), 16); 89 long unused = capacity - used; 90 if (unused < 0) { 91 throw new RuntimeException("Unused space (" + unused + ") less than 0"); 92 } 93 if (unused > reserve_alignment) { 94 // [1] Check for unused space 95 throw new RuntimeException("Unused space (" + unused + ") must be smaller than Metaspace::reserve_alignment() (" + 96 reserve_alignment + ")"); 97 } 98 if (last_region >= 0 && address != last_region) { 99 // [2] Check for no-gap 100 throw new RuntimeException("Region 0x" + address + " should have started at 0x" + Long.toString(last_region, 16)); 101 } 102 last_region = address + capacity; 103 } 104 } 105 } 106 if (checked.size() != 5) { 107 throw new RuntimeException("Must have 5 consecutive, fully utilized regions"); 108 } 109 } 110 }