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