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