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/*

 * @test TestG1TraceEagerReclaimHumongousObjects

 * @bug 8058801 8048179

 * @summary Ensure that the output for a G1TraceEagerReclaimHumongousObjects

 * includes the expected necessary messages.

 * @key gc

 * @library /testlibrary

 * @modules java.base/sun.misc

 *          java.management

 */

import java.util.LinkedList;

public class TestG1TraceEagerReclaimHumongousObjects {

  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:+G1TraceEagerReclaimHumongousObjects",

                                               GCTest.class.getName());

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

    // As G1EagerReclaimHumongousObjects 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:+G1TraceEagerReclaimHumongousObjects",

                                               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("Dead 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");

    }

  }

}