/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test TestG1TraceReclaimDeadHumongousObjectsAtYoungGC

 * @bug 8058801

 * @summary Ensure that the output for a G1TraceReclaimDeadHumongousObjectsAtYoungGC

 * includes the expected necessary messages.

 * @key gc

 * @library /testlibrary

 */

import com.oracle.java.testlibrary.ProcessTools;

import com.oracle.java.testlibrary.OutputAnalyzer;

import java.util.LinkedList;

public class TestG1TraceReclaimDeadHumongousObjectsAtYoungGC {

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

    testGCLogs();

    testHumongousObjectGCLogs();

  }

  private static void testGCLogs() throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                               "-Xms128M",

                                               "-Xmx128M",

                                               "-Xmn16M",

                                               "-XX:G1HeapRegionSize=1M",

                                               "-XX:+PrintGC",

                                               "-XX:+UnlockExperimentalVMOptions",

                                               "-XX:G1LogLevel=finest",

                                               "-XX:+G1TraceReclaimDeadHumongousObjectsAtYoungGC",

                                               GCTest.class.getName());

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed.

    // And GCTest doesn't have humongous objects, so values should be zero.

    output.shouldContain("[Humongous Reclaim");

    output.shouldContain("[Humongous Total: 0]");

    output.shouldContain("[Humongous Candidate: 0]");

    output.shouldContain("[Humongous Reclaimed: 0]");

    output.shouldHaveExitValue(0);

  }

  private static void testHumongousObjectGCLogs() throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                               "-Xms128M",

                                               "-Xmx128M",

                                               "-Xmn16M",

                                               "-XX:G1HeapRegionSize=1M",

                                               "-XX:+PrintGC",

                                               "-XX:+UnlockExperimentalVMOptions",

                                               "-XX:G1LogLevel=finest",

                                               "-XX:+G1TraceReclaimDeadHumongousObjectsAtYoungGC",

                                               GCWithHumongousObjectTest.class.getName());

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed.

    output.shouldContain("[Humongous Reclaim");

    output.shouldContain("[Humongous Total");

    output.shouldContain("[Humongous Candidate");

    output.shouldContain("[Humongous Reclaimed");

    // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects,

    // these logs should be displayed.

    output.shouldContain("Live humongous");

    output.shouldContain("Reclaim humongous region");

    output.shouldHaveExitValue(0);

  }

  static class GCTest {

    private static byte[] garbage;

    public static void main(String [] args) {

      System.out.println("Creating garbage");

      // create 128MB of garbage. This should result in at least one GC

      for (int i = 0; i < 1024; i++) {

        garbage = new byte[128 * 1024];

      }

      System.out.println("Done");

    }

  }

  static class GCWithHumongousObjectTest {

    public static final int M = 1024*1024;

    public static LinkedList<Object> garbageList = new LinkedList<Object>();

    // A large object referenced by a static.

    static int[] filler = new int[10 * M];

    public static void genGarbage() {

      for (int i = 0; i < 32*1024; i++) {

        garbageList.add(new int[100]);

      }

      garbageList.clear();

    }

    public static void main(String[] args) {

      int[] large = new int[M];

      Object ref = large;

      System.out.println("Creating garbage");

      for (int i = 0; i < 100; i++) {

        // A large object that will be reclaimed eagerly.

        large = new int[6*M];

        genGarbage();

        // Make sure that the compiler cannot completely remove

        // the allocation of the large object until here.

        System.out.println(large);

      }

      // Keep the reference to the first object alive.

      System.out.println(ref);

      System.out.println("Done");

    }

  }

}