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view test/testlibrary/whitebox/sun/hotspot/WhiteBox.java @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
author | tschatzl |
---|---|
date | Fri, 10 Oct 2014 15:51:58 +0200 |
parents | b509b7ff561c |
children | 417e3b8d04c5 |
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/* * Copyright (c) 2012, 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. * */ package sun.hotspot; import java.lang.reflect.Executable; import java.util.Arrays; import java.util.List; import java.util.function.Function; import java.util.stream.Stream; import java.security.BasicPermission; import sun.hotspot.parser.DiagnosticCommand; public class WhiteBox { @SuppressWarnings("serial") public static class WhiteBoxPermission extends BasicPermission { public WhiteBoxPermission(String s) { super(s); } } private WhiteBox() {} private static final WhiteBox instance = new WhiteBox(); private static native void registerNatives(); /** * Returns the singleton WhiteBox instance. * * The returned WhiteBox object should be carefully guarded * by the caller, since it can be used to read and write data * at arbitrary memory addresses. It must never be passed to * untrusted code. */ public synchronized static WhiteBox getWhiteBox() { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPermission(new WhiteBoxPermission("getInstance")); } return instance; } static { registerNatives(); } // Get the maximum heap size supporting COOPs public native long getCompressedOopsMaxHeapSize(); // Arguments public native void printHeapSizes(); // Memory public native long getObjectAddress(Object o); public native int getHeapOopSize(); public native boolean isObjectInOldGen(Object o); public native long getObjectSize(Object o); // Runtime // Make sure class name is in the correct format public boolean isClassAlive(String name) { return isClassAlive0(name.replace('.', '/')); } private native boolean isClassAlive0(String name); // G1 public native boolean g1InConcurrentMark(); public native boolean g1IsHumongous(Object o); public native long g1NumFreeRegions(); public native int g1RegionSize(); public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args); // NMT public native long NMTMalloc(long size); public native void NMTFree(long mem); public native long NMTReserveMemory(long size); public native void NMTCommitMemory(long addr, long size); public native void NMTUncommitMemory(long addr, long size); public native void NMTReleaseMemory(long addr, long size); public native void NMTOverflowHashBucket(long num); public native long NMTMallocWithPseudoStack(long size, int index); public native boolean NMTIsDetailSupported(); // Compiler public native void deoptimizeAll(); public boolean isMethodCompiled(Executable method) { return isMethodCompiled(method, false /*not osr*/); } public native boolean isMethodCompiled(Executable method, boolean isOsr); public boolean isMethodCompilable(Executable method) { return isMethodCompilable(method, -1 /*any*/); } public boolean isMethodCompilable(Executable method, int compLevel) { return isMethodCompilable(method, compLevel, false /*not osr*/); } public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr); public native boolean isMethodQueuedForCompilation(Executable method); public int deoptimizeMethod(Executable method) { return deoptimizeMethod(method, false /*not osr*/); } public native int deoptimizeMethod(Executable method, boolean isOsr); public void makeMethodNotCompilable(Executable method) { makeMethodNotCompilable(method, -1 /*any*/); } public void makeMethodNotCompilable(Executable method, int compLevel) { makeMethodNotCompilable(method, compLevel, false /*not osr*/); } public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr); public int getMethodCompilationLevel(Executable method) { return getMethodCompilationLevel(method, false /*not ost*/); } public native int getMethodCompilationLevel(Executable method, boolean isOsr); public native boolean testSetDontInlineMethod(Executable method, boolean value); public int getCompileQueuesSize() { return getCompileQueueSize(-1 /*any*/); } public native int getCompileQueueSize(int compLevel); public native boolean testSetForceInlineMethod(Executable method, boolean value); public boolean enqueueMethodForCompilation(Executable method, int compLevel) { return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); } public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci); public native void clearMethodState(Executable method); public native int getMethodEntryBci(Executable method); public native Object[] getNMethod(Executable method, boolean isOsr); // Intered strings public native boolean isInStringTable(String str); // Memory public native void readReservedMemory(); public native long allocateMetaspace(ClassLoader classLoader, long size); public native void freeMetaspace(ClassLoader classLoader, long addr, long size); public native long incMetaspaceCapacityUntilGC(long increment); public native long metaspaceCapacityUntilGC(); // force Young GC public native void youngGC(); // force Full GC public native void fullGC(); // Tests on ReservedSpace/VirtualSpace classes public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); public native void runMemoryUnitTests(); public native void readFromNoaccessArea(); public native long getThreadStackSize(); public native long getThreadRemainingStackSize(); // CPU features public native String getCPUFeatures(); // Native extensions public native long getHeapUsageForContext(int context); public native long getHeapRegionCountForContext(int context); public native int getContextForObject(Object obj); public native void printRegionInfo(int context); // VM flags public native void setBooleanVMFlag(String name, boolean value); public native void setIntxVMFlag(String name, long value); public native void setUintxVMFlag(String name, long value); public native void setUint64VMFlag(String name, long value); public native void setStringVMFlag(String name, String value); public native void setDoubleVMFlag(String name, double value); public native Boolean getBooleanVMFlag(String name); public native Long getIntxVMFlag(String name); public native Long getUintxVMFlag(String name); public native Long getUint64VMFlag(String name); public native String getStringVMFlag(String name); public native Double getDoubleVMFlag(String name); private final List<Function<String,Object>> flagsGetters = Arrays.asList( this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag, this::getStringVMFlag, this::getDoubleVMFlag); public Object getVMFlag(String name) { return flagsGetters.stream() .map(f -> f.apply(name)) .filter(x -> x != null) .findAny() .orElse(null); } }