jdk-24/test/hotspot/jtreg/gc/nvdimm/TestHumongousObjectsOnNvdimm.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package gc.nvdimm;

/*
 * @test TestHumongousObjectsOnNvdimm
 * @summary Check that humongous objects reside in nv-dimm
 * @library /test/lib /
 * @requires vm.gc=="null" & os.family != "aix"
 * @requires test.vm.gc.nvdimm
 * @build sun.hotspot.WhiteBox
 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
 * @run main gc.nvdimm.TestHumongousObjectsOnNvdimm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *                                  -XX:+WhiteBoxAPI
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.Asserts;
import sun.hotspot.WhiteBox;

import java.util.ArrayList;
import java.util.Collections;
import gc.testlibrary.Helpers;

/**
 * Test spawns HumongousObjectTest in a separate VM and expects that it
 * completes without a RuntimeException.
 */
public class TestHumongousObjectsOnNvdimm {

    private static ArrayList<String> testOpts;

    public static void main(String args[]) throws Exception {
        testOpts = new ArrayList<>();

        String[] common_options = new String[] {
            "-Xbootclasspath/a:.",
            "-XX:+UnlockExperimentalVMOptions",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:+WhiteBoxAPI",
            "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."),
            "-Xms10M", "-Xmx10M",
            "-XX:G1HeapRegionSize=1m"
        };

        String testVmOptsStr = System.getProperty("test.java.opts");
        if (!testVmOptsStr.isEmpty()) {
            String[] testVmOpts = testVmOptsStr.split(" ");
            Collections.addAll(testOpts, testVmOpts);
        }
        Collections.addAll(testOpts, common_options);

        // Test with G1 GC
        runTest("-XX:+UseG1GC");
    }

    private static void runTest(String... extraFlags) throws Exception {
        Collections.addAll(testOpts, extraFlags);
        testOpts.add(HumongousObjectTest.class.getName());
        System.out.println(testOpts);

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false,
                testOpts.toArray(new String[testOpts.size()]));

        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldHaveExitValue(0);
    }
}

/**
 * This class tests that a humongous object resides in NVDIMM.
 */
class HumongousObjectTest {
    private static final WhiteBox WB = WhiteBox.getWhiteBox();

    private static void validateObject(Object o) {
        Asserts.assertTrue(WB.isObjectInOldGen(o),
                "Object is supposed to be in OldGen");

        long obj_addr = WB.getObjectAddress(o);
        long nvdimm_heap_start = WB.nvdimmReservedStart();
        long nvdimm_heap_end = WB.nvdimmReservedEnd();

        Asserts.assertTrue(WB.g1BelongsToHumongousRegion(obj_addr), "Object address should be in Humongous set");
        Asserts.assertTrue(obj_addr >= nvdimm_heap_start && obj_addr < nvdimm_heap_end,
                "Humongous object does not reside in NVDIMM");
    }

    public static void main(String args[]) throws Exception {
        // allocate an humongous object
        int byteArrayMemoryOverhead = Helpers.detectByteArrayAllocationOverhead();
        int MinByteArrayHumongousSize = (WB.g1RegionSize() / 2) - byteArrayMemoryOverhead + 1;
        byte[] obj = new byte[MinByteArrayHumongousSize];

        validateObject(obj);
    }
}