/*

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

 *

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 * 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.

 *

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 */

/*

 * @test TestHumongousAllocInitialMark

 * @bug 7168848

 * @summary G1: humongous object allocations should initiate marking cycles when necessary

 * @library /testlibrary

 */

import com.oracle.java.testlibrary.*;

public class TestHumongousAllocInitialMark {

    private static final int heapSize                       = 200; // MB

    private static final int heapRegionSize                 = 1;   // MB

    private static final int initiatingHeapOccupancyPercent = 50;  // %

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

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

            "-XX:+UseG1GC",

            "-Xms" + heapSize + "m",

            "-Xmx" + heapSize + "m",

            "-XX:G1HeapRegionSize=" + heapRegionSize + "m",

            "-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,

            "-XX:+PrintGC",

            HumongousObjectAllocator.class.getName());

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

        output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");

        output.shouldNotContain("Full GC");

        output.shouldHaveExitValue(0);

    }

    static class HumongousObjectAllocator {

        private static byte[] dummy;

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

            // Make object size 75% of region size

            final int humongousObjectSize =

                (int)(heapRegionSize * 1024 * 1024 * 0.75);

            // Number of objects to allocate to go above IHOP

            final int humongousObjectAllocations =

                (int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;

            // Allocate

            for (int i = 1; i <= humongousObjectAllocations; i++) {

                System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +

                                   " of size " + humongousObjectSize + " bytes");

                dummy = new byte[humongousObjectSize];

            }

        }

    }

}