1 /* 2 * Copyright (c) 2014, 2020, 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.cds.CDSOptions; 37 import jdk.test.lib.process.OutputAnalyzer; 38 import sun.hotspot.WhiteBox; 39 40 import java.util.regex.Pattern; 41 import java.util.regex.Matcher; 42 import java.util.ArrayList; 43 import java.util.Hashtable; 44 import java.lang.Integer; 45 46 public class SpaceUtilizationCheck { 47 // For the MC/RW/RO regions: 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("-Xlog:cds=debug"); 55 56 // (2) Use the now deprecated VM arguments. They should have no effect. 57 test("-Xlog:cds=debug", 58 "-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 CDSOptions opts = new CDSOptions(); 66 opts.addSuffix(extra_options); 67 OutputAnalyzer output = CDSTestUtils.createArchive(opts); 68 CDSTestUtils.checkDump(output); 69 Pattern pattern = Pattern.compile("(..) space: *([0-9]+).* out of *([0-9]+) bytes .* at 0x([0-9a0-f]+)"); 70 WhiteBox wb = WhiteBox.getWhiteBox(); 71 long reserve_alignment = wb.metaspaceReserveAlignment(); 72 System.out.println("Metaspace::reserve_alignment() = " + reserve_alignment); 73 74 // Look for output like this. The pattern will only match the first 3 regions, which is what we need to check 75 // 76 // [4.682s][debug][cds] mc space: 24912 [ 0.2% of total] out of 28672 bytes [ 86.9% used] at 0x0000000800000000 77 // [4.682s][debug][cds] rw space: 4391632 [ 33.7% of total] out of 4395008 bytes [ 99.9% used] at 0x0000000800007000 78 // [4.682s][debug][cds] ro space: 7570632 [ 58.0% of total] out of 7573504 bytes [100.0% used] at 0x0000000800438000 79 // [4.682s][debug][cds] bm space: 213528 [ 1.6% of total] out of 213528 bytes [100.0% used] 80 // [4.682s][debug][cds] ca0 space: 507904 [ 3.9% of total] out of 507904 bytes [100.0% used] at 0x00000000fff00000 81 // [4.682s][debug][cds] oa0 space: 327680 [ 2.5% of total] out of 327680 bytes [100.0% used] at 0x00000000ffe00000 82 // [4.682s][debug][cds] total : 13036288 [100.0% of total] out of 13049856 bytes [ 99.9% used] 83 84 long last_region = -1; 85 Hashtable<String,String> checked = new Hashtable<>(); 86 for (String line : output.getStdout().split("\n")) { 87 if (line.contains(" space:") && !line.contains("st space:")) { 88 Matcher matcher = pattern.matcher(line); 89 if (matcher.find()) { 90 String name = matcher.group(1); 91 System.out.println("Checking " + name + " in : " + line); 92 checked.put(name, name); 93 long used = Long.parseLong(matcher.group(2)); 94 long capacity = Long.parseLong(matcher.group(3)); 95 long address = Long.parseLong(matcher.group(4), 16); 96 long unused = capacity - used; 97 if (unused < 0) { 98 throw new RuntimeException("Unused space (" + unused + ") less than 0"); 99 } 100 if (unused > reserve_alignment) { 101 // [1] Check for unused space 102 throw new RuntimeException("Unused space (" + unused + ") must be smaller than Metaspace::reserve_alignment() (" + 103 reserve_alignment + ")"); 104 } 105 if (last_region >= 0 && address != last_region) { 106 // [2] Check for no-gap 107 throw new RuntimeException("Region 0x" + address + " should have started at 0x" + Long.toString(last_region, 16)); 108 } 109 last_region = address + capacity; 110 } 111 } 112 } 113 if (checked.size() != 3) { 114 throw new RuntimeException("Must have 3 consecutive, fully utilized regions"); // MC,RW,RO 115 } 116 } 117 }