8037968: Add tests on alignment of objects copied to survivor space

Reviewed-by: jmasa, dfazunen

test/TEST.groups

@@ -171,6 +171,7 @@ needs_compact3 = \
   gc/g1/TestShrinkAuxiliaryData20.java \
   gc/g1/TestShrinkAuxiliaryData25.java \
   gc/g1/TestShrinkAuxiliaryData30.java \
+  gc/survivorAlignment \
   runtime/InternalApi/ThreadCpuTimesDeadlock.java \
   serviceability/threads/TestFalseDeadLock.java \
   serviceability/jvmti/GetObjectSizeOverflow.java \

test/gc/arguments/TestSurvivorAlignmentInBytesOption.java

+/*
+ * 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.
+ */
+
+import com.oracle.java.testlibrary.ExitCode;
+import com.oracle.java.testlibrary.Utils;
+import com.oracle.java.testlibrary.cli.CommandLineOptionTest;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * @test
+ * @bug 8031323
+ * @summary Verify SurvivorAlignmentInBytes option processing.
+ * @library /testlibrary
+ * @run main TestSurvivorAlignmentInBytesOption
+ */
+public class TestSurvivorAlignmentInBytesOption {
+    private static final String[] FILTERED_VM_OPTIONS
+            = Utils.getFilteredTestJavaOpts(
+            "UnlockExperimentalVMOptions",
+            "SurvivorAlignmentInBytes",
+            "ObjectAlignmentInBytes");
+
+    public static void main(String args[]) throws Throwable {
+        String optionName = "SurvivorAlignmentInBytes";
+        String optionIsExperimental
+                = CommandLineOptionTest.getExperimentalOptionErrorMessage(
+                optionName);
+        String valueIsTooSmall= ".*SurvivorAlignmentInBytes=.*must be greater"
+                + " than ObjectAlignmentInBytes.*";
+        String mustBePowerOf2 = ".*SurvivorAlignmentInBytes=.*must be "
+                + "power of 2.*";
+
+        // Verify that without -XX:+UnlockExperimentalVMOptions usage of
+        // SurvivorAlignmentInBytes option will cause JVM startup failure
+        // with the warning message saying that that option is experimental.
+        CommandLineOptionTest.verifyJVMStartup(
+                new String[]{optionIsExperimental}, null, ExitCode.FAIL, false,
+                TestSurvivorAlignmentInBytesOption.prepareOptions(
+                        "-XX:-UnlockExperimentalVMOptions",
+                        CommandLineOptionTest.prepareNumericFlag(
+                                optionName, 64)));
+
+        // Verify that with -XX:+UnlockExperimentalVMOptions passed to JVM
+        // usage of SurvivorAlignmentInBytes option won't cause JVM startup
+        // failure.
+        CommandLineOptionTest.verifyJVMStartup(
+                null, new String[]{optionIsExperimental}, ExitCode.OK, false,
+                TestSurvivorAlignmentInBytesOption.prepareOptions(
+                        CommandLineOptionTest.prepareNumericFlag(
+                                optionName, 64)));
+
+        // Verify that if specified SurvivorAlignmentInBytes is lower then
+        // ObjectAlignmentInBytes, then the JVM startup will fail with
+        // appropriate error message.
+        CommandLineOptionTest.verifyJVMStartup(
+                new String[]{valueIsTooSmall}, null, ExitCode.FAIL, false,
+                TestSurvivorAlignmentInBytesOption.prepareOptions(
+                        CommandLineOptionTest.prepareNumericFlag(
+                                optionName, 2)));
+
+        // Verify that if specified SurvivorAlignmentInBytes value is not
+        // a power of 2 then the JVM startup will fail with appropriate error
+        // message.
+        CommandLineOptionTest.verifyJVMStartup(
+                new String[]{mustBePowerOf2}, null, ExitCode.FAIL, false,
+                TestSurvivorAlignmentInBytesOption.prepareOptions(
+                        CommandLineOptionTest.prepareNumericFlag(
+                                optionName, 127)));
+
+        // Verify that if SurvivorAlignmentInBytes has correct value, then
+        // the JVM will be started without errors.
+        CommandLineOptionTest.verifyJVMStartup(
+                null, new String[]{".*SurvivorAlignmentInBytes.*"},
+                ExitCode.OK, false,
+                TestSurvivorAlignmentInBytesOption.prepareOptions(
+                        CommandLineOptionTest.prepareNumericFlag(
+                                optionName, 128)));
+
+        // Verify that we can setup different SurvivorAlignmentInBytes values.
+        for (int alignment = 32; alignment <= 128; alignment *= 2) {
+            CommandLineOptionTest.verifyOptionValue(optionName,
+                    Integer.toString(alignment), false,
+                    TestSurvivorAlignmentInBytesOption.prepareOptions(
+                            CommandLineOptionTest.prepareNumericFlag(
+                                    optionName, alignment)));
+        }
+    }
+
+    private static String[] prepareOptions(String... options) {
+        List<String> finalOptions = new LinkedList<>();
+        Collections.addAll(finalOptions,
+                TestSurvivorAlignmentInBytesOption.FILTERED_VM_OPTIONS);
+        finalOptions.add(CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS);
+        Collections.addAll(finalOptions, options);
+        return finalOptions.toArray(new String[finalOptions.size()]);
+    }
+}

test/gc/survivorAlignment/AlignmentHelper.java

+/*
+ * 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.
+ */
+
+import java.lang.management.MemoryPoolMXBean;
+import java.util.Optional;
+
+import sun.hotspot.WhiteBox;
+
+/**
+ * Helper class aimed to provide information about alignment of objects in
+ * particular heap space, expected memory usage after objects' allocation so on.
+ */
+public class AlignmentHelper {
+    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
+
+    private static final long OBJECT_ALIGNMENT_IN_BYTES_FOR_32_VM = 8L;
+
+    /**
+     * Max relative allowed actual memory usage deviation from expected memory
+     * usage.
+     */
+    private static final float MAX_RELATIVE_DEVIATION = 0.05f; // 5%
+
+    public static final long OBJECT_ALIGNMENT_IN_BYTES = Optional.ofNullable(
+            AlignmentHelper.WHITE_BOX.getIntxVMFlag("ObjectAlignmentInBytes"))
+            .orElse(AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES_FOR_32_VM);
+
+    public static final long SURVIVOR_ALIGNMENT_IN_BYTES = Optional.ofNullable(
+            AlignmentHelper.WHITE_BOX.getIntxVMFlag("SurvivorAlignmentInBytes"))
+            .orElseThrow(() ->new AssertionError(
+                    "Unable to get SurvivorAlignmentInBytes value"));
+    /**
+     * Min amount of memory that will be occupied by an object.
+     */
+    public static final long MIN_OBJECT_SIZE
+            = AlignmentHelper.WHITE_BOX.getObjectSize(new Object());
+    /**
+     * Min amount of memory that will be occupied by an empty byte array.
+     */
+    public static final long MIN_ARRAY_SIZE
+            = AlignmentHelper.WHITE_BOX.getObjectSize(new byte[0]);
+
+    /**
+     * Precision at which actual memory usage in a heap space represented by
+     * this sizing helper could be measured.
+     */
+    private final long memoryUsageMeasurementPrecision;
+    /**
+     * Min amount of memory that will be occupied by an object allocated in a
+     * heap space represented by this sizing helper.
+     */
+    private final long minObjectSizeInThisSpace;
+    /**
+     * Object's alignment in a heap space represented by this sizing helper.
+     */
+    private final long objectAlignmentInThisRegion;
+    /**
+     * MemoryPoolMXBean associated with a heap space represented by this sizing
+     * helper.
+     */
+    private final MemoryPoolMXBean poolMXBean;
+
+    private static long alignUp(long value, long alignment) {
+        return ((value - 1) / alignment + 1) * alignment;
+    }
+
+    protected AlignmentHelper(long memoryUsageMeasurementPrecision,
+            long objectAlignmentInThisRegion, long minObjectSizeInThisSpace,
+            MemoryPoolMXBean poolMXBean) {
+        this.memoryUsageMeasurementPrecision = memoryUsageMeasurementPrecision;
+        this.minObjectSizeInThisSpace = minObjectSizeInThisSpace;
+        this.objectAlignmentInThisRegion = objectAlignmentInThisRegion;
+        this.poolMXBean = poolMXBean;
+    }
+
+    /**
+     * Returns how many objects have to be allocated to fill
+     * {@code memoryToFill} bytes in this heap space using objects of size
+     * {@code objectSize}.
+     */
+    public int getObjectsCount(long memoryToFill, long objectSize) {
+        return (int) (memoryToFill / getObjectSizeInThisSpace(objectSize));
+    }
+
+    /**
+     * Returns amount of memory that {@code objectsCount} of objects with size
+     * {@code objectSize} will occupy this this space after allocation.
+     */
+    public long getExpectedMemoryUsage(long objectSize, int objectsCount) {
+        long correctedObjectSize = getObjectSizeInThisSpace(objectSize);
+        return AlignmentHelper.alignUp(correctedObjectSize * objectsCount,
+                memoryUsageMeasurementPrecision);
+    }
+
+    /**
+     * Returns current memory usage in this heap space.
+     */
+    public long getActualMemoryUsage() {
+        return poolMXBean.getUsage().getUsed();
+    }
+
+    /**
+     * Returns maximum memory usage deviation from {@code expectedMemoryUsage}
+     * given the max allowed relative deviation equal to
+     * {@code relativeDeviation}.
+     *
+     * Note that value returned by this method is aligned according to
+     * memory measurement precision for this heap space.
+     */
+    public long getAllowedMemoryUsageDeviation(long expectedMemoryUsage) {
+        long unalignedDeviation = (long) (expectedMemoryUsage *
+                AlignmentHelper.MAX_RELATIVE_DEVIATION);
+        return AlignmentHelper.alignUp(unalignedDeviation,
+                memoryUsageMeasurementPrecision);
+    }
+
+    /**
+     * Returns amount of memory that will be occupied by an object with size
+     * {@code objectSize} in this heap space.
+     */
+    public long getObjectSizeInThisSpace(long objectSize) {
+        objectSize = Math.max(objectSize, minObjectSizeInThisSpace);
+
+        long alignedObjectSize = AlignmentHelper.alignUp(objectSize,
+                objectAlignmentInThisRegion);
+        long sizeDiff = alignedObjectSize - objectSize;
+
+        // If there is not enough space to fit padding object, then object will
+        // be aligned to {@code 2 * objectAlignmentInThisRegion}.
+        if (sizeDiff >= AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES
+                && sizeDiff < AlignmentHelper.MIN_OBJECT_SIZE) {
+            alignedObjectSize += AlignmentHelper.MIN_OBJECT_SIZE;
+            alignedObjectSize = AlignmentHelper.alignUp(alignedObjectSize,
+                    objectAlignmentInThisRegion);
+        }
+
+        return alignedObjectSize;
+    }
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+
+        builder.append(String.format("AlignmentHelper for memory pool '%s':%n",
+                poolMXBean.getName()));
+        builder.append(String.format("Memory usage measurement precision: %d%n",
+                memoryUsageMeasurementPrecision));
+        builder.append(String.format("Min object size in this space: %d%n",
+                minObjectSizeInThisSpace));
+        builder.append(String.format("Object alignment in this space: %d%n",
+                objectAlignmentInThisRegion));
+
+        return builder.toString();
+    }
+}

test/gc/survivorAlignment/SurvivorAlignmentTestMain.java

+/*
+ * 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.
+ */
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryPoolMXBean;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.oracle.java.testlibrary.Asserts;
+import com.sun.management.ThreadMXBean;
+import sun.hotspot.WhiteBox;
+import sun.misc.Unsafe;
+
+/**
+ * Main class for tests on {@code SurvivorAlignmentInBytes} option.
+ *
+ * Typical usage is to obtain instance using fromArgs method, allocate objects
+ * and verify that actual memory usage in tested heap space is close to
+ * expected.
+ */
+public class SurvivorAlignmentTestMain {
+    enum HeapSpace {
+        EDEN,
+        SURVIVOR,
+        TENURED
+    }
+
+    public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
+
+    public static final long MAX_TENURING_THRESHOLD = Optional.ofNullable(
+            SurvivorAlignmentTestMain.WHITE_BOX.getIntxVMFlag(
+                    "MaxTenuringThreshold")).orElse(15L);
+
+    /**
+     * Regexp used to parse memory size params, like 2G, 34m or 15k.
+     */
+    private static final Pattern SIZE_REGEX
+            = Pattern.compile("(?<size>[0-9]+)(?<multiplier>[GMKgmk])?");
+
+    // Names of different heap spaces.
+    private static final String DEF_NEW_EDEN = "Eden Space";
+    private static final String DEF_NEW_SURVIVOR = "Survivor Space";
+    private static final String PAR_NEW_EDEN = "Par Eden Space";
+    private static final String PAR_NEW_SURVIVOR = "Par Survivor Space";
+    private static final String PS_EDEN = "PS Eden Space";
+    private static final String PS_SURVIVOR = "PS Survivor Space";
+    private static final String G1_EDEN = "G1 Eden Space";
+    private static final String G1_SURVIVOR = "G1 Survivor Space";
+    private static final String SERIAL_TENURED = "Tenured Gen";
+    private static final String CMS_TENURED = "CMS Old Gen";
+    private static final String PS_TENURED = "PS Old Gen";
+    private static final String G1_TENURED = "G1 Old Gen";
+
+    private static final long G1_HEAP_REGION_SIZE = Optional.ofNullable(
+            SurvivorAlignmentTestMain.WHITE_BOX.getUintxVMFlag(
+                    "G1HeapRegionSize")).orElse(-1L);
+
+    /**
+     * Min size of free chunk in CMS generation.
+     * An object allocated in CMS generation will at least occupy this amount
+     * of bytes.
+     */
+    private static final long CMS_MIN_FREE_CHUNK_SIZE
+            = 3L * Unsafe.ADDRESS_SIZE;
+
+    private static final AlignmentHelper EDEN_SPACE_HELPER;
+    private static final AlignmentHelper SURVIVOR_SPACE_HELPER;
+    private static final AlignmentHelper TENURED_SPACE_HELPER;
+    /**
+     * Amount of memory that should be filled during a test run.
+     */
+    private final long memoryToFill;
+    /**
+     * The size of an objects that will be allocated during a test run.
+     */
+    private final long objectSize;
+    /**
+     * Amount of memory that will be actually occupied by an object in eden
+     * space.
+     */
+    private final long actualObjectSize;
+    /**
+     * Storage for allocated objects.
+     */
+    private final Object[] garbage;
+    /**
+     * Heap space whose memory usage is a subject of assertions during the test
+     * run.
+     */
+    private final HeapSpace testedSpace;
+
+    private long[] baselinedThreadMemoryUsage = null;
+    private long[] threadIds = null;
+
+    /**
+     * Initialize {@code EDEN_SPACE_HELPER}, {@code SURVIVOR_SPACE_HELPER} and
+     * {@code TENURED_SPACE_HELPER} to represent heap spaces in use.
+     *
+     * Note that regardless to GC object's alignment in survivor space is
+     * expected to be equal to {@code SurvivorAlignmentInBytes} value and
+     * alignment in other spaces is expected to be equal to
+     * {@code ObjectAlignmentInBytes} value.
+     *
+     * In CMS generation we can't allocate less then {@code MinFreeChunk} value,
+     * for other CGs we expect that object of size {@code MIN_OBJECT_SIZE}
+     * could be allocated as it is (of course, its size could be aligned
+     * according to alignment value used in a particular space).
+     *
+     * For G1 GC MXBeans could report memory usage only with region size
+     * precision (if an object allocated in some G1 heap region, then all region
+     * will claimed as used), so for G1's spaces precision is equal to
+     * {@code G1HeapRegionSize} value.
+     */
+    static {
+        AlignmentHelper edenHelper = null;
+        AlignmentHelper survivorHelper = null;
+        AlignmentHelper tenuredHelper = null;
+        for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
+            switch (pool.getName()) {
+                case SurvivorAlignmentTestMain.DEF_NEW_EDEN:
+                case SurvivorAlignmentTestMain.PAR_NEW_EDEN:
+                case SurvivorAlignmentTestMain.PS_EDEN:
+                    Asserts.assertNull(edenHelper,
+                            "Only one bean for eden space is expected.");
+                    edenHelper = new AlignmentHelper(
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.MIN_OBJECT_SIZE, pool);
+                    break;
+                case SurvivorAlignmentTestMain.G1_EDEN:
+                    Asserts.assertNull(edenHelper,
+                            "Only one bean for eden space is expected.");
+                    edenHelper = new AlignmentHelper(
+                            SurvivorAlignmentTestMain.G1_HEAP_REGION_SIZE,
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.MIN_OBJECT_SIZE, pool);
+                    break;
+                case SurvivorAlignmentTestMain.DEF_NEW_SURVIVOR:
+                case SurvivorAlignmentTestMain.PAR_NEW_SURVIVOR:
+                case SurvivorAlignmentTestMain.PS_SURVIVOR:
+                    Asserts.assertNull(survivorHelper,
+                            "Only one bean for survivor space is expected.");
+                    survivorHelper = new AlignmentHelper(
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.SURVIVOR_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.MIN_OBJECT_SIZE, pool);
+                    break;
+                case SurvivorAlignmentTestMain.G1_SURVIVOR:
+                    Asserts.assertNull(survivorHelper,
+                            "Only one bean for survivor space is expected.");
+                    survivorHelper = new AlignmentHelper(
+                            SurvivorAlignmentTestMain.G1_HEAP_REGION_SIZE,
+                            AlignmentHelper.SURVIVOR_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.MIN_OBJECT_SIZE, pool);
+                    break;
+                case SurvivorAlignmentTestMain.SERIAL_TENURED:
+                case SurvivorAlignmentTestMain.PS_TENURED:
+                case SurvivorAlignmentTestMain.G1_TENURED:
+                    Asserts.assertNull(tenuredHelper,
+                            "Only one bean for tenured space is expected.");
+                    tenuredHelper = new AlignmentHelper(
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.MIN_OBJECT_SIZE, pool);
+                    break;
+                case SurvivorAlignmentTestMain.CMS_TENURED:
+                    Asserts.assertNull(tenuredHelper,
+                            "Only one bean for tenured space is expected.");
+                    tenuredHelper = new AlignmentHelper(
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES,
+                            SurvivorAlignmentTestMain.CMS_MIN_FREE_CHUNK_SIZE,
+                            pool);
+                    break;
+            }
+        }
+        EDEN_SPACE_HELPER = Objects.requireNonNull(edenHelper,
+                "AlignmentHelper for eden space should be initialized.");
+        SURVIVOR_SPACE_HELPER = Objects.requireNonNull(survivorHelper,
+                "AlignmentHelper for survivor space should be initialized.");
+        TENURED_SPACE_HELPER = Objects.requireNonNull(tenuredHelper,
+                "AlignmentHelper for tenured space should be initialized.");
+    }
+    /**
+     * Returns an SurvivorAlignmentTestMain instance constructed using CLI
+     * options.
+     *
+     * Following options are expected:
+     * <ul>
+     *     <li>memoryToFill</li>
+     *     <li>objectSize</li>
+     * </ul>
+     *
+     * Both argument may contain multiplier suffix k, m or g.
+     */
+    public static SurvivorAlignmentTestMain fromArgs(String[] args) {
+        Asserts.assertEQ(args.length, 3, "Expected three arguments: "
+                + "memory size, object size and tested heap space name.");
+
+        long memoryToFill = parseSize(args[0]);
+        long objectSize = Math.max(parseSize(args[1]),
+                AlignmentHelper.MIN_ARRAY_SIZE);
+        HeapSpace testedSpace = HeapSpace.valueOf(args[2]);
+
+        return new SurvivorAlignmentTestMain(memoryToFill, objectSize,
+                testedSpace);
+    }
+
+    /**
+     * Returns a value parsed from a string with format
+     * &lt;integer&gt;&lt;multiplier&gt;.
+     */
+    private static long parseSize(String sizeString) {
+        Matcher matcher = SIZE_REGEX.matcher(sizeString);
+        Asserts.assertTrue(matcher.matches(),
+                "sizeString should have following format \"[0-9]+([MBK])?\"");
+        long size = Long.valueOf(matcher.group("size"));
+
+        if (matcher.group("multiplier") != null) {
+            long K = 1024L;
+            // fall through multipliers
+            switch (matcher.group("multiplier").toLowerCase()) {
+                case "g":
+                    size *= K;
+                case "m":
+                    size *= K;
+                case "k":
+                    size *= K;
+            }
+        }
+        return size;
+    }
+
+    private SurvivorAlignmentTestMain(long memoryToFill, long objectSize,
+            HeapSpace testedSpace) {
+        this.objectSize = objectSize;
+        this.memoryToFill = memoryToFill;
+        this.testedSpace = testedSpace;
+
+        AlignmentHelper helper = SurvivorAlignmentTestMain.EDEN_SPACE_HELPER;
+
+        this.actualObjectSize = helper.getObjectSizeInThisSpace(
+                this.objectSize);
+        int arrayLength = helper.getObjectsCount(memoryToFill, this.objectSize);
+        garbage = new Object[arrayLength];
+    }
+
+    /**
+     * Allocate byte arrays to fill {@code memoryToFill} memory.
+     */
+    public void allocate() {
+        int byteArrayLength = Math.max((int) (objectSize
+                - Unsafe.ARRAY_BYTE_BASE_OFFSET), 0);
+
+        for (int i = 0; i < garbage.length; i++) {
+            garbage[i] = new byte[byteArrayLength];
+        }
+    }
+
+    /**
+     * Release memory occupied after {@code allocate} call.
+     */
+    public void release() {
+        for (int i = 0; i < garbage.length; i++) {
+            garbage[i] = null;
+        }
+    }
+
+    /**
+     * Returns expected amount of memory occupied in a {@code heapSpace} by
+     * objects referenced from {@code garbage} array.
+     */
+    public long getExpectedMemoryUsage() {
+        AlignmentHelper alignmentHelper = getAlignmentHelper(testedSpace);
+        return alignmentHelper.getExpectedMemoryUsage(objectSize,
+                garbage.length);
+    }
+
+    /**
+     * Verifies that memory usage in a {@code heapSpace} deviates from
+     * {@code expectedUsage} for no more than {@code MAX_RELATIVE_DEVIATION}.
+     */
+    public void verifyMemoryUsage(long expectedUsage) {
+        AlignmentHelper alignmentHelper = getAlignmentHelper(testedSpace);
+
+        long actualMemoryUsage = alignmentHelper.getActualMemoryUsage();
+        boolean otherThreadsAllocatedMemory = areOtherThreadsAllocatedMemory();
+
+        long memoryUsageDiff = Math.abs(actualMemoryUsage - expectedUsage);
+        long maxAllowedUsageDiff
+                = alignmentHelper.getAllowedMemoryUsageDeviation(expectedUsage);
+
+        System.out.println("Verifying memory usage in space: " + testedSpace);
+        System.out.println("Allocated objects count: " + garbage.length);
+        System.out.println("Desired object size: " + objectSize);
+        System.out.println("Actual object size: " + actualObjectSize);
+        System.out.println("Expected object size in space: "
+                + alignmentHelper.getObjectSizeInThisSpace(objectSize));
+        System.out.println("Expected memory usage: " + expectedUsage);
+        System.out.println("Actual memory usage: " + actualMemoryUsage);
+        System.out.println("Memory usage diff: " + memoryUsageDiff);
+        System.out.println("Max allowed usage diff: " + maxAllowedUsageDiff);
+
+        if (memoryUsageDiff > maxAllowedUsageDiff
+                && otherThreadsAllocatedMemory) {
+            System.out.println("Memory usage diff is incorrect, but it seems "
+                    + "like someone else allocated objects");
+            return;
+        }
+
+        Asserts.assertLTE(memoryUsageDiff, maxAllowedUsageDiff,
+                "Actual memory usage should not deviate from expected for " +
+                        "more then " + maxAllowedUsageDiff);
+    }
+
+    /**
+     * Baselines amount of memory allocated by each thread.
+     */
+    public void baselineMemoryAllocation() {
+        ThreadMXBean bean = (ThreadMXBean) ManagementFactory.getThreadMXBean();
+        threadIds = bean.getAllThreadIds();
+        baselinedThreadMemoryUsage = bean.getThreadAllocatedBytes(threadIds);
+    }
+
+    /**
+     * Checks if threads other then the current thread were allocating objects
+     * after baselinedThreadMemoryUsage call.
+     *
+     * If baselinedThreadMemoryUsage was not called, then this method will return
+     * {@code false}.
+     */
+    public boolean areOtherThreadsAllocatedMemory() {
+        if (baselinedThreadMemoryUsage == null) {
+            return false;
+        }
+
+        ThreadMXBean bean = (ThreadMXBean) ManagementFactory.getThreadMXBean();
+        long currentMemoryAllocation[]
+                = bean.getThreadAllocatedBytes(threadIds);
+        boolean otherThreadsAllocatedMemory = false;
+
+        System.out.println("Verifying amount of memory allocated by threads:");
+        for (int i = 0; i < threadIds.length; i++) {
+            System.out.format("Thread %d%nbaseline allocation: %d"
+                            + "%ncurrent allocation:%d%n", threadIds[i],
+                    baselinedThreadMemoryUsage[i], currentMemoryAllocation[i]);
+            System.out.println(bean.getThreadInfo(threadIds[i]));
+
+            long bytesAllocated = Math.abs(currentMemoryAllocation[i]
+                    - baselinedThreadMemoryUsage[i]);
+            if (bytesAllocated > 0
+                    && threadIds[i] != Thread.currentThread().getId()) {
+                otherThreadsAllocatedMemory = true;
+            }
+        }
+
+        return otherThreadsAllocatedMemory;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+
+        builder.append(String.format("SurvivorAlignmentTestMain info:%n"));
+        builder.append(String.format("Desired object size: %d%n", objectSize));
+        builder.append(String.format("Memory to fill: %d%n", memoryToFill));
+        builder.append(String.format("Objects to be allocated: %d%n",
+                garbage.length));
+
+        builder.append(String.format("Alignment helpers to be used: %n"));
+        for (HeapSpace heapSpace: HeapSpace.values()) {
+            builder.append(String.format("For space %s:%n%s%n", heapSpace,
+                    getAlignmentHelper(heapSpace)));
+        }
+
+        return builder.toString();
+    }
+
+    /**
+     * Returns {@code AlignmentHelper} for a space {@code heapSpace}.
+     */
+    public static AlignmentHelper getAlignmentHelper(HeapSpace heapSpace) {
+        switch (heapSpace) {
+            case EDEN:
+                return SurvivorAlignmentTestMain.EDEN_SPACE_HELPER;
+            case SURVIVOR:
+                return SurvivorAlignmentTestMain.SURVIVOR_SPACE_HELPER;
+            case TENURED:
+                return SurvivorAlignmentTestMain.TENURED_SPACE_HELPER;
+            default:
+                throw new Error("Unexpected heap space: " + heapSpace);
+        }
+    }
+}

test/gc/survivorAlignment/TestAllocationInEden.java

+/*
+ * 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
+ * @bug 8031323
+ * @summary Verify that object's alignment in eden space is not affected by
+ *          SurvivorAlignmentInBytes option.
+ * @library /testlibrary /testlibrary/whitebox
+ * @build TestAllocationInEden SurvivorAlignmentTestMain AlignmentHelper
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32 -XX:-UseTLAB
+ *                    -XX:OldSize=128m -XX:-ExplicitGCInvokesConcurrent
+ *                   TestAllocationInEden 10m 9 EDEN
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32 -XX:-UseTLAB
+ *                    -XX:OldSize=128m -XX:-ExplicitGCInvokesConcurrent
+ *                   TestAllocationInEden 10m 47 EDEN
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64 -XX:-UseTLAB
+ *                    -XX:OldSize=128m -XX:-ExplicitGCInvokesConcurrent
+ *                   TestAllocationInEden 10m 9 EDEN
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64 -XX:-UseTLAB
+ *                    -XX:OldSize=128m -XX:-ExplicitGCInvokesConcurrent
+ *                   TestAllocationInEden 10m 87 EDEN
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128 -XX:-UseTLAB
+ *                    -XX:OldSize=128m -XX:-ExplicitGCInvokesConcurrent
+ *                   TestAllocationInEden 10m 9 EDEN
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128 -XX:-UseTLAB
+ *                    -XX:OldSize=128m -XX:-ExplicitGCInvokesConcurrent
+ *                   TestAllocationInEden 10m 147 EDEN
+ */
+public class TestAllocationInEden {
+    public static void main(String args[]) {
+        SurvivorAlignmentTestMain test
+                = SurvivorAlignmentTestMain.fromArgs(args);
+        System.out.println(test);
+
+        long expectedMemoryUsage = test.getExpectedMemoryUsage();
+        test.baselineMemoryAllocation();
+        System.gc();
+
+        test.allocate();
+
+        test.verifyMemoryUsage(expectedMemoryUsage);
+    }
+}

test/gc/survivorAlignment/TestPromotionFromEdenToTenured.java

+/*
+ * 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
+ * @bug 8031323
+ * @summary Verify that objects promoted from eden space to tenured space during
+ *          full GC are not aligned to SurvivorAlignmentInBytes value.
+ * @library /testlibrary /testlibrary/whitebox
+ * @build TestPromotionFromEdenToTenured SurvivorAlignmentTestMain
+ *        AlignmentHelper
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                    -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32
+ *                   TestPromotionFromEdenToTenured 10m 9 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                    -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32
+ *                   TestPromotionFromEdenToTenured 10m 47 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                    -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64
+ *                   TestPromotionFromEdenToTenured 10m 9 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                    -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64
+ *                   TestPromotionFromEdenToTenured 10m 87 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:OldSize=32M -XX:SurvivorRatio=1
+ *                    -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128
+ *                   TestPromotionFromEdenToTenured 10m 9 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                    -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128
+ *                   TestPromotionFromEdenToTenured 10m 147 TENURED
+ */
+public class TestPromotionFromEdenToTenured {
+    public static void main(String args[]) {
+        SurvivorAlignmentTestMain test
+                = SurvivorAlignmentTestMain.fromArgs(args);
+        System.out.println(test);
+
+        long expectedMemoryUsage = test.getExpectedMemoryUsage();
+        test.baselineMemoryAllocation();
+        System.gc();
+        // increase expected usage by current old gen usage
+        expectedMemoryUsage += SurvivorAlignmentTestMain.getAlignmentHelper(
+                SurvivorAlignmentTestMain.HeapSpace.TENURED)
+                .getActualMemoryUsage();
+
+        test.allocate();
+        System.gc();
+
+        test.verifyMemoryUsage(expectedMemoryUsage);
+    }
+}

test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterFullGC.java

+/*
+ * 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
+ * @bug 8031323
+ * @summary Verify that objects promoted from survivor space to tenured space
+ *          during full GC are not aligned to SurvivorAlignmentInBytes value.
+ * @library /testlibrary /testlibrary/whitebox
+ * @build TestPromotionFromSurvivorToTenuredAfterFullGC
+ *        SurvivorAlignmentTestMain AlignmentHelper
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32
+ *                   TestPromotionFromSurvivorToTenuredAfterFullGC 10m 9 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32
+ *                   TestPromotionFromSurvivorToTenuredAfterFullGC 20m 47
+ *                   TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=200m -XX:MaxNewSize=200m
+ *                   -XX:OldSize=32m -XX:InitialHeapSize=232m
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64
+ *                   TestPromotionFromSurvivorToTenuredAfterFullGC 10m 9 TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64
+ *                   TestPromotionFromSurvivorToTenuredAfterFullGC 20m 87
+ *                   TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=256m -XX:MaxNewSize=256m
+ *                   -XX:OldSize=32M -XX:InitialHeapSize=288m
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128
+ *                    TestPromotionFromSurvivorToTenuredAfterFullGC 10m 9
+ *                    TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32m -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128
+ *                   TestPromotionFromSurvivorToTenuredAfterFullGC 20m 147
+ *                   TENURED
+ */
+public class TestPromotionFromSurvivorToTenuredAfterFullGC {
+    public static void main(String args[]) {
+        SurvivorAlignmentTestMain test
+                = SurvivorAlignmentTestMain.fromArgs(args);
+        System.out.println(test);
+
+        long expectedMemoryUsage = test.getExpectedMemoryUsage();
+        test.baselineMemoryAllocation();
+        System.gc();
+        // increase expected usage by current old gen usage
+        expectedMemoryUsage += SurvivorAlignmentTestMain.getAlignmentHelper(
+                SurvivorAlignmentTestMain.HeapSpace.TENURED)
+                .getActualMemoryUsage();
+
+        test.allocate();
+        SurvivorAlignmentTestMain.WHITE_BOX.youngGC();
+        System.gc();
+
+        test.verifyMemoryUsage(expectedMemoryUsage);
+    }
+}

test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterMinorGC.java

+/*
+ * 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
+ * @bug 8031323
+ * @summary Verify that objects promoted from survivor space to tenured space
+ *          when their age exceeded tenuring threshold are not aligned to
+ *          SurvivorAlignmentInBytes value.
+ * @library /testlibrary /testlibrary/whitebox
+ * @build TestPromotionFromSurvivorToTenuredAfterMinorGC
+ *        SurvivorAlignmentTestMain AlignmentHelper
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32M -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32
+ *                   TestPromotionFromSurvivorToTenuredAfterMinorGC 10m 9
+ *                   TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32M -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32
+ *                   TestPromotionFromSurvivorToTenuredAfterMinorGC 20m 47
+ *                   TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=200m -XX:MaxNewSize=200m
+ *                   -XX:OldSize=32M -XX:InitialHeapSize=232m
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64
+ *                   TestPromotionFromSurvivorToTenuredAfterMinorGC 10m 9
+ *                   TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32M -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64
+ *                   TestPromotionFromSurvivorToTenuredAfterMinorGC 20m 87
+ *                   TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=256m -XX:MaxNewSize=256m
+ *                   -XX:OldSize=32M -XX:InitialHeapSize=288m
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128
+ *                    TestPromotionFromSurvivorToTenuredAfterMinorGC 10m 9
+ *                    TENURED
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:OldSize=32M -XX:SurvivorRatio=1
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128
+ *                   TestPromotionFromSurvivorToTenuredAfterMinorGC 20m 147
+ *                   TENURED
+ */
+public class TestPromotionFromSurvivorToTenuredAfterMinorGC {
+    public static void main(String args[]) throws Exception {
+        SurvivorAlignmentTestMain test
+                = SurvivorAlignmentTestMain.fromArgs(args);
+        System.out.println(test);
+
+        long expectedMemoryUsage = test.getExpectedMemoryUsage();
+        test.baselineMemoryAllocation();
+        SurvivorAlignmentTestMain.WHITE_BOX.fullGC();
+        // increase expected usage by current old gen usage
+        expectedMemoryUsage += SurvivorAlignmentTestMain.getAlignmentHelper(
+                SurvivorAlignmentTestMain.HeapSpace.TENURED)
+                .getActualMemoryUsage();
+
+        test.allocate();
+        for (int i = 0; i <= SurvivorAlignmentTestMain.MAX_TENURING_THRESHOLD;
+             i++) {
+            SurvivorAlignmentTestMain.WHITE_BOX.youngGC();
+        }
+
+        test.verifyMemoryUsage(expectedMemoryUsage);
+    }
+}

test/gc/survivorAlignment/TestPromotionToSurvivor.java

+/*
+ * 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
+ * @bug 8031323
+ * @summary Verify that objects promoted from eden space to survivor space after
+ *          minor GC are aligned to SurvivorAlignmentInBytes.
+ * @library /testlibrary /testlibrary/whitebox
+ * @build TestPromotionToSurvivor
+ *        SurvivorAlignmentTestMain AlignmentHelper
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32 -XX:OldSize=128m
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   TestPromotionToSurvivor 10m 9 SURVIVOR
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=32 -XX:OldSize=128m
+ *                   TestPromotionToSurvivor 20m 47 SURVIVOR
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64 -XX:OldSize=128m
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   TestPromotionToSurvivor 8m 9 SURVIVOR
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=64 -XX:OldSize=128m
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   TestPromotionToSurvivor 20m 87 SURVIVOR
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=256m -XX:MaxNewSize=256m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128 -XX:OldSize=32m
+ *                   -XX:InitialHeapSize=288m  -XX:-ExplicitGCInvokesConcurrent
+ *                   TestPromotionToSurvivor 10m 9 SURVIVOR
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
+ *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
+ *                   -XX:SurvivorAlignmentInBytes=128 -XX:OldSize=128m
+ *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   TestPromotionToSurvivor 20m 147 SURVIVOR
+ */
+public class TestPromotionToSurvivor {
+    public static void main(String args[]) {
+        SurvivorAlignmentTestMain test
+                = SurvivorAlignmentTestMain.fromArgs(args);
+        System.out.println(test);
+
+        long expectedUsage = test.getExpectedMemoryUsage();
+        test.baselineMemoryAllocation();
+        SurvivorAlignmentTestMain.WHITE_BOX.fullGC();
+
+        test.allocate();
+        SurvivorAlignmentTestMain.WHITE_BOX.youngGC();
+
+        test.verifyMemoryUsage(expectedUsage);
+    }
+}