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

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    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 }