stan/jdk-24
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

8132718: Add tests which check that when humongous classloader object becomes unreachable it and all classes that were loaded in it should be collected

Browse Source 
Reviewed-by: jmasa, dfazunen
This commit is contained in:
Kirill Zhaldybin 2016-04-21 17:55:14 +03:00
parent 769aba784a
commit b15c8503ab
2 changed files with 320 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

100
hotspot/test/gc/g1/humongousObjects/ClassLoaderGenerator.java Normal file
View File

@ -0,0 +1,100 @@
/*
* Copyright (c) 2016, 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 java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
/**
* Generates non-humongous and humongous class loaders.
* Since the generation depends on current host architecture it cannot be done as part of pre-compilation step
*/
public class ClassLoaderGenerator {
public static void main(String[] args) throws IOException {
if (args.length != 1) {
throw new Error("Test Bug: Expected region size wasn't provided as command line argument");
}
long regionSize = Long.parseLong(args[0]) * 1024 * 1024;
Path wrkDir = Paths.get("");
generateClassLoader(regionSize, wrkDir);
}
public static void generateClassLoader(long regionSize, Path wrkDir) throws IOException {
// Generating simple classloader
String finalSimpleClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE
.replace("${Methods}",
TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE
.replace("${ClassLoadFilter}",
"fileName.equals(\"" + TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME
+ "\")"))
.replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER)
.replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE);
Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME, "ClassLoader",
finalSimpleClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE, regionSize / 4,
wrkDir, TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME + "Base");
// Preparations for generating humongous classloader
// Generating condition for loadClass method of generated class loader
// We want the generated class loader to load only classes from G1SampleClass enum
// All other classes should be loaded by parent classloader
// As result we get full loadClass method
StringBuilder classesToLoadBuilder = new StringBuilder();
for (G1SampleClass g1SampleClass : G1SampleClass.values()) {
if (classesToLoadBuilder.length() != 0) {
classesToLoadBuilder.append(" || ");
}
classesToLoadBuilder.append("fileName.startsWith(\"" + Helpers.enumNameToClassName(g1SampleClass.name())
+ "\")");
}
// Generating final class loader prototype - with specified methods,header and constructor
String finalHumongousClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE
.replace("${Methods}",
TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE
.replace("${ClassLoadFilter}", classesToLoadBuilder))
.replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER)
.replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE);
// Generating humongous classloader with specified name, base class, final class prototype and
// constructor prototype for filler classes
// Generated class instance should be humongous since we specify size of (regionSize * 3 / 4)
Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME, "ClassLoader",
finalHumongousClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE,
regionSize * 3 / 4,
wrkDir, TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME + "Base");
}
}

220
hotspot/test/gc/g1/humongousObjects/TestHumongousClassLoader.java Normal file
View File

@ -0,0 +1,220 @@
/*
* Copyright (c) 2016, 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 sun.hotspot.WhiteBox;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Path;
import java.nio.file.Paths;
/**
* @test gc.g1.humongousObjects.TestHumongousClassLoader
* @summary Checks that unreachable classes and unreachable humongous class loader are unloaded after GC
* @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.ClassLoaderGenerator
* gc.g1.humongousObjects.TestHumongousClassLoader
*
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
*
* @run main/othervm/timeout=240 -Xms256M -Xmx256M -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* gc.g1.humongousObjects.ClassLoaderGenerator 1
*
* @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xlog:classload,classunload=debug:file=TestHumongousClassLoader_Full_GC.log
* -XX:G1HeapRegionSize=1M
* gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC
*
* @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xlog:classload,classunload=debug:file=TestHumongousClassLoader_Full_GC_Mem_Pressure.log
* -XX:G1HeapRegionSize=1M
* gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC_MEMORY_PRESSURE
*
*@run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
* -Xlog:classload,classunload=debug:file=TestHumongousClassLoader_CMC.log
* -XX:G1HeapRegionSize=1M -XX:MaxTenuringThreshold=1
* gc.g1.humongousObjects.TestHumongousClassLoader CMC
*
*/
public class TestHumongousClassLoader {
private static final WhiteBox WB = WhiteBox.getWhiteBox();
private static final String SAMPLE_CLASS_NAME_PREFIX = "SampleClassFiller";
public static final String SIMPLE_CLASSLOADER_NAME = "SimpleClassLoader";
public static final String HUMONGOUS_CLASSLOADER_NAME = "HumongousClassLoader";
public static final String LOAD_CLASS_METHOD_PROTOTYPE =
" @Override\n"
+ " public Class loadClass(String fileName) throws ClassNotFoundException {\n"
+ " if (${ClassLoadFilter}) {\n"
+ " System.out.println(\"Loading class \" + fileName);\n"
+ " byte[] b = null;\n"
+ " try {\n"
+ " b = Files.readAllBytes(new File(fileName + \".class\").toPath());\n"
+ " } catch (IOException e) {\n"
+ " e.printStackTrace();\n"
+ " }\n"
+ " Class c = defineClass(fileName, b, 0, b.length);\n"
+ " resolveClass(c);\n"
+ " return c;\n"
+ " } else {\n"
+ " return super.loadClass(fileName);\n"
+ " }\n"
+ "\n"
+ "\n"
+ " }\n";
public static final String CLASS_HEADER = "import java.io.File;\n"
+ "import java.io.IOException;\n"
+ "import java.nio.file.Files;\n"
+ "import java.nio.file.Paths;\n";
public static final String GENERIC_PROTOTYPE = "${ClassHeader}\n"
+ "public class ${ClassName} extends ${BaseClass}{\n"
+ " ${ConstructorClause}\n"
+ " ${Methods}\n"
+ " ${Fields}\n"
+ "}\n";
public static final String CONSTUCTOR_PROTOTYPE = "public ${ClassName}(ClassLoader parent) { super(parent);}\n";
private enum GC {
FULL_GC {
@Override
public void provoke() {
System.gc();
}
},
CMC {
@Override
public void provoke() {
// We need 2 young gc to promote class loader to old gen
// Otherwise it will not be unloaded after CMC
WHITE_BOX.youngGC();
Helpers.waitTillCMCFinished(WHITE_BOX, 0);
WHITE_BOX.youngGC();
Helpers.waitTillCMCFinished(WHITE_BOX, 0);
WHITE_BOX.g1StartConcMarkCycle();
Helpers.waitTillCMCFinished(WHITE_BOX, 0);
}
},
FULL_GC_MEMORY_PRESSURE {
@Override
public void provoke() {
WHITE_BOX.fullGC();
}
};
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
public abstract void provoke();
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException,
IllegalAccessException, IOException, NoSuchMethodException, InvocationTargetException {
if (args.length != 1) {
throw new Error("Test Bug: Expected GC type wasn't provided as command line argument");
}
GC gc = GC.valueOf(args[0]);
Path wrkDir = Paths.get("");
URL[] url = {wrkDir.toUri().toURL()};
URLClassLoader urlLoader = new URLClassLoader(url);
Class<?> simpleClassLoaderClass = urlLoader.loadClass(SIMPLE_CLASSLOADER_NAME);
ClassLoader simpleClassLoader = (ClassLoader) simpleClassLoaderClass
.getConstructor(java.lang.ClassLoader.class)
.newInstance(TestHumongousClassLoader.class.getClassLoader());
// Sanity check
Asserts.assertEquals(WB.g1IsHumongous(simpleClassLoader), false,
"Test Bug: simpleClassLoader is expected to be non-humongous but it's humongous");
Class<?> humongousClassLoaderClass = simpleClassLoader.loadClass(HUMONGOUS_CLASSLOADER_NAME);
ClassLoader humongousClassLoader = (ClassLoader) humongousClassLoaderClass
.getConstructor(java.lang.ClassLoader.class)
.newInstance(simpleClassLoader);
// Sanity check
Asserts.assertEquals(WB.g1IsHumongous(humongousClassLoader), true,
"Test Bug: humongousClassLoader is expected to be humongous but it's non-humongous");
//Asserts.assertEquals(1,0);
Object[] loadedClasses = new Object[]{
G1SampleClass.LARGEST_NON_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX)
.newInstance(),
G1SampleClass.SMALLEST_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX)
.newInstance(),
G1SampleClass.ONE_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX)
.newInstance(),
G1SampleClass.TWO_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX)
.newInstance(),
};
// forgetting references to loaded classes
for (int i = 0; i < loadedClasses.length; ++i) {
loadedClasses[i] = null;
}
// forgetting referencies to classloaders
humongousClassLoader = null;
humongousClassLoaderClass = null;
simpleClassLoader = null;
simpleClassLoaderClass = null;
gc.provoke();
// Test checks
Asserts.assertEquals(WB.isClassAlive(HUMONGOUS_CLASSLOADER_NAME), false,
String.format("Classloader class %s is loaded after we forget all references to it",
HUMONGOUS_CLASSLOADER_NAME));
for (G1SampleClass sampleClass : G1SampleClass.values()) {
String className = Helpers.enumNameToClassName(sampleClass.name()) + "Class";
Asserts.assertEquals(WB.isClassAlive(className), false,
String.format("Class %s is loaded after we forget all references to it", className));
}
}
}