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8132717: Add tests checking that instances of j.l.Classes of a large size are allocated as Humongous

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Reviewed-by: jmasa, dfazunen
This commit is contained in:
Kirill Zhaldybin 2016-01-13 20:26:54 +03:00
parent 459ed3c70a
commit bbe36d6b8f
2 changed files with 216 additions and 0 deletions
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93
hotspot/test/gc/g1/humongousObjects/G1SampleClass.java Normal file
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/*
* 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();
}

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hotspot/test/gc/g1/humongousObjects/TestHumongousNonArrayAllocation.java Normal file
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/*
* 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-")));
}
}