jdk-24/test/hotspot/jtreg/runtime/SharedArchiveFile/SpaceUtilizationCheck.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test SpaceUtilizationCheck
 * @summary Check if the space utilization for shared spaces is adequate
 * @requires vm.cds
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @build sun.hotspot.WhiteBox
 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI SpaceUtilizationCheck
 */

import jdk.test.lib.cds.CDSTestUtils;
import jdk.test.lib.process.OutputAnalyzer;
import sun.hotspot.WhiteBox;

import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.ArrayList;
import java.util.Hashtable;
import java.lang.Integer;

public class SpaceUtilizationCheck {
    // [1] Each region must have strictly less than
    //     WhiteBox.metaspaceReserveAlignment() bytes of unused space.
    // [2] There must be no gap between two consecutive regions.

    public static void main(String[] args) throws Exception {
        // (1) Default VM arguments
        test();

        // (2) Use the now deprecated VM arguments. They should have no effect.
        test("-XX:SharedReadWriteSize=128M",
             "-XX:SharedReadOnlySize=128M",
             "-XX:SharedMiscDataSize=128M",
             "-XX:SharedMiscCodeSize=128M");
    }

    static void test(String... extra_options) throws Exception {
        OutputAnalyzer output = CDSTestUtils.createArchive(extra_options);
        CDSTestUtils.checkDump(output);
        Pattern pattern = Pattern.compile("^(..) *space: *([0-9]+).* out of *([0-9]+) bytes .* at 0x([0-9a0-f]+)");
        WhiteBox wb = WhiteBox.getWhiteBox();
        long reserve_alignment = wb.metaspaceReserveAlignment();
        System.out.println("Metaspace::reserve_alignment() = " + reserve_alignment);

        long last_region = -1;
        Hashtable<String,String> checked = new Hashtable<>();
        for (String line : output.getStdout().split("\n")) {
            if (line.contains(" space:") && !line.contains("st space:")) {
                Matcher matcher = pattern.matcher(line);
                if (matcher.find()) {
                    String name = matcher.group(1);
                    if (name.equals("s0") || name.equals("s1")) {
                      // String regions are listed at the end and they may not be fully occupied.
                      break;
                    } else {
                      System.out.println("Checking " + name + " in : " + line);
                      checked.put(name, name);
                    }
                    long used = Long.parseLong(matcher.group(2));
                    long capacity = Long.parseLong(matcher.group(3));
                    long address = Long.parseLong(matcher.group(4), 16);
                    long unused = capacity - used;
                    if (unused < 0) {
                        throw new RuntimeException("Unused space (" + unused + ") less than 0");
                    }
                    if (unused > reserve_alignment) {
                        // [1] Check for unused space
                        throw new RuntimeException("Unused space (" + unused + ") must be smaller than Metaspace::reserve_alignment() (" +
                                                   reserve_alignment + ")");
                    }
                    if (last_region >= 0 && address != last_region) {
                        // [2] Check for no-gap
                        throw new RuntimeException("Region 0x" + address + " should have started at 0x" + Long.toString(last_region, 16));
                    }
                    last_region = address + capacity;
                }
            }
        }
        if (checked.size() != 5) {
          throw new RuntimeException("Must have 5 consecutive, fully utilized regions");
        }
    }
}