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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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/*

 * @test

 * @key gc

 * @bug 8049831

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run driver TestCMSClassUnloadingEnabledHWM

 * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.

 */

import java.lang.management.GarbageCollectorMXBean;

import java.lang.management.ManagementFactory;

import java.util.ArrayList;

import java.util.Arrays;

import sun.hotspot.WhiteBox;

public class TestCMSClassUnloadingEnabledHWM {

  private static long MetaspaceSize = 32 * 1024 * 1024;

  private static long YoungGenSize  = 32 * 1024 * 1024;

  private static OutputAnalyzer run(boolean enableUnloading) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

      "-Xbootclasspath/a:.",

      "-XX:+UnlockDiagnosticVMOptions",

      "-XX:+WhiteBoxAPI",

      "-Xmx128m",

      "-XX:CMSMaxAbortablePrecleanTime=1",

      "-XX:CMSWaitDuration=50",

      "-XX:MetaspaceSize=" + MetaspaceSize,

      "-Xmn" + YoungGenSize,

      "-XX:+UseConcMarkSweepGC",

      "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",

      "-Xlog:gc",

      TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),

      "" + MetaspaceSize);

    return new OutputAnalyzer(pb.start());

  }

  public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {

    return run(true);

  }

  public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {

    return run(false);

  }

  public static void testWithoutCMSClassUnloading() throws Exception {

    // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.

    OutputAnalyzer out = runWithoutCMSClassUnloading();

    out.shouldMatch(".*Pause Full.*");

    out.shouldNotMatch(".*Pause Initial Mark.*");

  }

  public static void testWithCMSClassUnloading() throws Exception {

    // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.

    OutputAnalyzer out = runWithCMSClassUnloading();

    out.shouldMatch(".*Pause Initial Mark.*");

    out.shouldNotMatch(".*Pause Full.*");

  }

  public static void main(String args[]) throws Exception {

    testWithCMSClassUnloading();

    testWithoutCMSClassUnloading();

  }

  public static class AllocateBeyondMetaspaceSize {

    public static void main(String [] args) throws Exception {

      if (args.length != 1) {

        throw new IllegalArgumentException("Usage: <MetaspaceSize>");

      }

      WhiteBox wb = WhiteBox.getWhiteBox();

      // Allocate past the MetaspaceSize limit.

      long metaspaceSize = Long.parseLong(args[0]);

      long allocationBeyondMetaspaceSize  = metaspaceSize * 2;

      long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);

      // Wait for at least one GC to occur. The caller will parse the log files produced.

      GarbageCollectorMXBean cmsGCBean = getCMSGCBean();

      while (cmsGCBean.getCollectionCount() == 0) {

        Thread.sleep(100);

      }

      wb.freeMetaspace(null, metaspace, metaspace);

    }

    private static GarbageCollectorMXBean getCMSGCBean() {

      for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {

        if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) {

          return gcBean;

        }

      }

      return null;

    }

  }

}