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

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 *

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 * 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

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 *

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

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/*

 * @test TestHumongousAllocNearlyFullRegion

 * @bug 8143587

 * @summary G1: humongous object allocations should work even when there is

 *              not enough space in the heapRegion to fit a filler object.

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

 * @library /test/lib

 * @run driver TestHumongousAllocNearlyFullRegion

 */

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

public class TestHumongousAllocNearlyFullRegion {

    // Heap sizes < 224 MB are increased to 224 MB if vm_page_size == 64K to

    // fulfill alignment constraints.

    private static final int heapSize                       = 224; // MB

    private static final int heapRegionSize                 = 1;   // MB

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

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

            "-XX:+UseG1GC",

            "-Xms" + heapSize + "m",

            "-Xmx" + heapSize + "m",

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

            "-Xlog:gc",

            HumongousObjectAllocator.class.getName());

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

        output.shouldContain("Pause Initial Mark (G1 Humongous Allocation)");

        output.shouldHaveExitValue(0);

    }

    static class HumongousObjectAllocator {

        public static void main(String [] args) {

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

                // 131069 is the number of longs it takes to fill a heapRegion except

                // for 8 bytes on 64 bit.

                long[] largeObect = new long[131069];

            }

        }

    }

}