--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/g1/humongousObjects/G1SampleClass.java Mon Jan 18 19:10:32 2016 +0100
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2015, 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.
+ *
+ */
+
+package gc.g1.humongousObjects;
+
+import gc.testlibrary.Helpers;
+import sun.hotspot.WhiteBox;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+/**
+ * Provides generated and compiled sample classes and theirs expected sizes.
+ */
+public enum G1SampleClass {
+
+ LARGEST_NON_HUMONGOUS {
+ @Override
+ public long expectedInstanceSize() {
+ return HALF_G1_REGION_SIZE;
+ }
+ },
+ SMALLEST_HUMONGOUS {
+ @Override
+ public long expectedInstanceSize() {
+ return HALF_G1_REGION_SIZE + Helpers.SIZE_OF_LONG;
+ }
+ },
+ ONE_REGION_HUMONGOUS {
+ @Override
+ public long expectedInstanceSize() {
+ return G1_REGION_SIZE;
+ }
+ },
+ TWO_REGION_HUMONGOUS {
+ @Override
+ public long expectedInstanceSize() {
+ return G1_REGION_SIZE + Helpers.SIZE_OF_LONG;
+ }
+ },
+ MORE_THAN_TWO_REGION_HUMONGOUS {
+ @Override
+ public long expectedInstanceSize() {
+ return G1_REGION_SIZE * 2 + Helpers.SIZE_OF_LONG;
+ }
+ };
+
+ private static final long G1_REGION_SIZE = WhiteBox.getWhiteBox().g1RegionSize();
+ private static final long HALF_G1_REGION_SIZE = G1_REGION_SIZE / 2;
+
+ /**
+ * Generates and compiles class with instance of specified size and loads it in specified class loader
+ *
+ * @param classLoader class loader which will be used to load class
+ * @param wrkDir working dir where generated classes are put and compiled
+ * @param classNamePrefix prefix for service classes (ones we use to create chain of inheritance)
+ * @return a class with instances of the specified size loaded in specified class loader
+ * @throws IOException
+ * @throws ClassNotFoundException
+ */
+
+ public Class<?> getCls(ClassLoader classLoader, Path wrkDir, String classNamePrefix)
+ throws IOException, ClassNotFoundException {
+ return Helpers.generateCompileAndLoad(classLoader, Helpers.enumNameToClassName(name()) + "Class",
+ expectedInstanceSize(), wrkDir, classNamePrefix);
+ }
+
+ /**
+ * @return G1SampleClass instance expected size
+ */
+ public abstract long expectedInstanceSize();
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/g1/humongousObjects/TestHumongousMovement.java Mon Jan 18 19:10:32 2016 +0100
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2015, 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.
+ *
+ */
+
+package gc.g1.humongousObjects;
+
+import gc.testlibrary.Helpers;
+import jdk.test.lib.Asserts;
+import jdk.test.lib.Utils;
+import sun.hotspot.WhiteBox;
+
+import java.io.PrintStream;
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.stream.Collectors;
+
+/**
+ * @test TestHumongousMovement
+ * @summary Checks that Humongous objects are not moved during GC
+ * @requires vm.gc=="G1" | vm.gc=="null"
+ * @library /testlibrary /test/lib /
+ * @modules java.management
+ * @build sun.hotspot.WhiteBox
+ * gc.testlibrary.Helpers
+ * gc.g1.humongousObjects.TestHumongousMovement
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ * sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ * -XX:G1HeapRegionSize=1M -Xms200m -Xmx200m -XX:InitiatingHeapOccupancyPercent=100
+ * -Xlog:gc=info:file=TestHumongousMovement.log
+ * gc.g1.humongousObjects.TestHumongousMovement
+ */
+
+public class TestHumongousMovement {
+
+ private static class AllocationData {
+ private final byte[] allocation;
+ public final BigInteger objectAddress;
+
+ public AllocationData(byte[] byteArray) {
+ allocation = byteArray;
+ objectAddress = new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation))));
+ }
+
+ public boolean isAddressChanged() {
+ return !new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation)))).equals(objectAddress);
+ }
+
+ public void printDetails(PrintStream out) {
+ BigInteger objectAddressAfterGC =
+ new BigInteger(Long.toUnsignedString((WB.getObjectAddress(allocation))));
+
+ out.println(String.format("Object stored address = %d\nObject address after GC = %d\n"
+ + "They are %sequals", objectAddress,
+ objectAddressAfterGC, !objectAddress.equals(objectAddressAfterGC) ? "not " : ""));
+ }
+
+ }
+
+ private static final WhiteBox WB = WhiteBox.getWhiteBox();
+
+ // How many allocated humongous objects should be deleted
+ private static final double HUMONGOUS_OBJECTS_DELETED_FACTOR = 0.5D;
+ // How many of free g1 regions should be used for humongous allocations
+ private static final double ALLOCATED_HUMONGOUS_REGIONS_FACTOR = 0.25D;
+
+ public static void main(String[] args) {
+
+ int g1RegionSize = WB.g1RegionSize();
+ int byteArrayMemoryOverhead = Helpers.detectByteArrayAllocationOverhead();
+
+ System.out.println("Total " + WB.g1NumMaxRegions() + " regions");
+ System.out.println("Total " + WB.g1NumFreeRegions() + " free regions");
+
+ int regionsToAllocate = (int) (WB.g1NumFreeRegions() * ALLOCATED_HUMONGOUS_REGIONS_FACTOR);
+
+ // Sanity check
+ Asserts.assertGreaterThan(regionsToAllocate, 0, "Test Bug: no regions to allocate");
+
+ System.out.println("Allocating " + regionsToAllocate + " humongous objects, each 90% of g1 region size");
+
+ List<AllocationData> allocations = new ArrayList<>();
+
+ // 90 % of maximum byte[] that takes one region
+ int hSize = (int) ((g1RegionSize - byteArrayMemoryOverhead) * 0.9);
+
+ // Sanity check
+ Asserts.assertGreaterThan(hSize, g1RegionSize / 2, "Test Bug: allocation size is not humongous");
+
+ for (int i = 0; i < regionsToAllocate; ++i) {
+ allocations.add(new AllocationData(new byte[hSize]));
+ }
+
+ Random rnd = Utils.getRandomInstance();
+
+ int toDelete = (int) (allocations.size() * HUMONGOUS_OBJECTS_DELETED_FACTOR);
+
+ for (int i = 0; i < toDelete; ++i) {
+ allocations.remove(rnd.nextInt(allocations.size()));
+ }
+
+ WB.fullGC();
+
+ List<AllocationData> movedObjects = allocations.stream()
+ .filter(AllocationData::isAddressChanged)
+ .collect(Collectors.toList());
+
+ if (movedObjects.size() > 0) {
+ System.out.println("Test failed - some humongous objects moved after Full GC");
+ movedObjects.stream().forEach(a -> a.printDetails(System.out));
+ throw new Error("Test failed - some humongous objects moved after Full GC");
+ } else {
+ System.out.println("Passed");
+ }
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/g1/humongousObjects/TestHumongousNonArrayAllocation.java Mon Jan 18 19:10:32 2016 +0100
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2015, 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.
+ *
+ */
+
+package gc.g1.humongousObjects;
+
+import jdk.test.lib.Asserts;
+import sun.hotspot.WhiteBox;
+
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+/**
+ * @test gc.g1.humongousObjects.TestHumongousNonArrayAllocation
+ * @summary Checks that huge class' instances (ie with huge amount of fields) are allocated successfully
+ * @requires vm.gc=="G1" | vm.gc=="null"
+ * @requires vm.opt.G1HeapRegionSize == "null" | vm.opt.G1HeapRegionSize == "1M"
+ * @library /testlibrary /test/lib /
+ * @modules java.management
+ * @build sun.hotspot.WhiteBox
+ * gc.testlibrary.Helpers
+ * gc.g1.humongousObjects.G1SampleClass
+ * gc.g1.humongousObjects.TestHumongousNonArrayAllocation
+ *
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ * sun.hotspot.WhiteBox$WhiteBoxPermission
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ * -XX:G1HeapRegionSize=1M
+ * gc.g1.humongousObjects.TestHumongousNonArrayAllocation LARGEST_NON_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ * -XX:G1HeapRegionSize=1M
+ * gc.g1.humongousObjects.TestHumongousNonArrayAllocation SMALLEST_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ * -XX:G1HeapRegionSize=1M
+ * gc.g1.humongousObjects.TestHumongousNonArrayAllocation ONE_REGION_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ * -XX:G1HeapRegionSize=1M
+ * gc.g1.humongousObjects.TestHumongousNonArrayAllocation TWO_REGION_HUMONGOUS
+ *
+ * @run main/othervm -Xms128M -Xmx128M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ * -XX:G1HeapRegionSize=1M
+ * gc.g1.humongousObjects.TestHumongousNonArrayAllocation MORE_THAN_TWO_REGION_HUMONGOUS
+ *
+ */
+
+/**
+ * The test for objects which are instances of classes with a huge amount of fields. It's an alternative way to create
+ * a humongous object rather to allocate a long array.
+ * The size of a class object depends on the field declared in the class. So, the tests generates such classes to cover
+ * the following cases:
+ * largest non-humongous object (exactly half a region)
+ * smallest humongous object (half a region + sizeof(long))
+ * humongous object that takes exactly one region
+ * humongous object that takes more than one region (region + sizeof(long))
+ * humongous object that takes more than two regions (region * 2 + sizeof(long))
+ *
+ */
+public class TestHumongousNonArrayAllocation {
+ private static final WhiteBox WB = WhiteBox.getWhiteBox();
+ private static final String CLASS_NAME_PREFIX = TestHumongousNonArrayAllocation.class.getSimpleName() + "_";
+
+ public static void main(String[] args) throws ClassNotFoundException, InstantiationException,
+ IllegalAccessException, IOException {
+
+ if (args.length != 1) {
+ throw new Error("Test Bug: Expected class name wasn't provided as command line argument");
+ }
+ G1SampleClass sampleClass = G1SampleClass.valueOf(args[0]);
+
+ Path wrkDir = Files.createTempDirectory(Paths.get(""), CLASS_NAME_PREFIX);
+ URL[] url = {wrkDir.toUri().toURL()};
+ URLClassLoader urlLoader = new URLClassLoader(url);
+
+ Object sampleObject;
+ try {
+ sampleObject = sampleClass.getCls(urlLoader, wrkDir, CLASS_NAME_PREFIX).newInstance();
+ } catch (Throwable throwable) {
+ throw new AssertionError("Test Bug: Cannot create object of provided class", throwable);
+ }
+
+ boolean isHumongous = WB.g1IsHumongous(sampleObject);
+ boolean shouldBeHumongous = (sampleClass.expectedInstanceSize() > (WB.g1RegionSize() / 2));
+
+ // Sanity check
+ Asserts.assertEquals(WB.getObjectSize(sampleObject), sampleClass.expectedInstanceSize(),
+ String.format("Test Bug: Object of class %s is expected to take %d bytes but it takes %d.",
+ sampleClass.name(), sampleClass.expectedInstanceSize(), WB.getObjectSize(sampleObject)));
+
+ // Test check
+ Asserts.assertEquals(isHumongous, shouldBeHumongous,
+ String.format("Object of class %s is expected to be %shumongous but it is not",
+ sampleClass.name(), (shouldBeHumongous ? "" : "non-")));
+ }
+
+}