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annotate test/testlibrary/whitebox/sun/hotspot/WhiteBox.java @ 20543:e7d0505c8a30

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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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1 /*
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 package sun.hotspot;
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26
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27 import java.lang.reflect.Executable;
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28 import java.util.Arrays;
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29 import java.util.List;
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30 import java.util.function.Function;
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31 import java.util.stream.Stream;
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32 import java.security.BasicPermission;
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33
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34 import sun.hotspot.parser.DiagnosticCommand;
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35
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36 public class WhiteBox {
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37
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38 @SuppressWarnings("serial")
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39 public static class WhiteBoxPermission extends BasicPermission {
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40 public WhiteBoxPermission(String s) {
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41 super(s);
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42 }
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43 }
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44
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45 private WhiteBox() {}
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46 private static final WhiteBox instance = new WhiteBox();
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47 private static native void registerNatives();
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48
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49 /**
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50 * Returns the singleton WhiteBox instance.
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51 *
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52 * The returned WhiteBox object should be carefully guarded
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53 * by the caller, since it can be used to read and write data
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54 * at arbitrary memory addresses. It must never be passed to
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55 * untrusted code.
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56 */
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57 public synchronized static WhiteBox getWhiteBox() {
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58 SecurityManager sm = System.getSecurityManager();
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59 if (sm != null) {
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60 sm.checkPermission(new WhiteBoxPermission("getInstance"));
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61 }
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62 return instance;
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63 }
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64
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65 static {
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66 registerNatives();
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67 }
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68
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69 // Get the maximum heap size supporting COOPs
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70 public native long getCompressedOopsMaxHeapSize();
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71 // Arguments
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72 public native void printHeapSizes();
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73
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74 // Memory
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75 public native long getObjectAddress(Object o);
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76 public native int getHeapOopSize();
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77 public native boolean isObjectInOldGen(Object o);
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78 public native long getObjectSize(Object o);
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79
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80 // Runtime
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81 // Make sure class name is in the correct format
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82 public boolean isClassAlive(String name) {
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83 return isClassAlive0(name.replace('.', '/'));
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84 }
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85 private native boolean isClassAlive0(String name);
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86
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87 // G1
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88 public native boolean g1InConcurrentMark();
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89 public native boolean g1IsHumongous(Object o);
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90 public native long g1NumFreeRegions();
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91 public native int g1RegionSize();
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92 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args);
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93
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94 // NMT
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95 public native long NMTMalloc(long size);
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96 public native void NMTFree(long mem);
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97 public native long NMTReserveMemory(long size);
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98 public native void NMTCommitMemory(long addr, long size);
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99 public native void NMTUncommitMemory(long addr, long size);
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100 public native void NMTReleaseMemory(long addr, long size);
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101 public native void NMTOverflowHashBucket(long num);
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102 public native long NMTMallocWithPseudoStack(long size, int index);
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103 public native boolean NMTIsDetailSupported();
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104
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105 // Compiler
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106 public native void deoptimizeAll();
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107 public boolean isMethodCompiled(Executable method) {
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108 return isMethodCompiled(method, false /*not osr*/);
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109 }
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110 public native boolean isMethodCompiled(Executable method, boolean isOsr);
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111 public boolean isMethodCompilable(Executable method) {
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112 return isMethodCompilable(method, -1 /*any*/);
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113 }
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114 public boolean isMethodCompilable(Executable method, int compLevel) {
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115 return isMethodCompilable(method, compLevel, false /*not osr*/);
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116 }
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117 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
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118 public native boolean isMethodQueuedForCompilation(Executable method);
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119 public int deoptimizeMethod(Executable method) {
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120 return deoptimizeMethod(method, false /*not osr*/);
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121 }
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122 public native int deoptimizeMethod(Executable method, boolean isOsr);
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123 public void makeMethodNotCompilable(Executable method) {
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124 makeMethodNotCompilable(method, -1 /*any*/);
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125 }
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126 public void makeMethodNotCompilable(Executable method, int compLevel) {
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127 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
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128 }
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129 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
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130 public int getMethodCompilationLevel(Executable method) {
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131 return getMethodCompilationLevel(method, false /*not ost*/);
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132 }
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133 public native int getMethodCompilationLevel(Executable method, boolean isOsr);
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134 public native boolean testSetDontInlineMethod(Executable method, boolean value);
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135 public int getCompileQueuesSize() {
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136 return getCompileQueueSize(-1 /*any*/);
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137 }
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138 public native int getCompileQueueSize(int compLevel);
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139 public native boolean testSetForceInlineMethod(Executable method, boolean value);
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140 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
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141 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
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142 }
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143 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
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144 public native void clearMethodState(Executable method);
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145 public native int getMethodEntryBci(Executable method);
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146 public native Object[] getNMethod(Executable method, boolean isOsr);
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147
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148 // Intered strings
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149 public native boolean isInStringTable(String str);
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150
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151 // Memory
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152 public native void readReservedMemory();
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153 public native long allocateMetaspace(ClassLoader classLoader, long size);
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154 public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
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155 public native long incMetaspaceCapacityUntilGC(long increment);
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156 public native long metaspaceCapacityUntilGC();
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157
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158 // force Young GC
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159 public native void youngGC();
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160
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161 // force Full GC
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162 public native void fullGC();
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163
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164 // Tests on ReservedSpace/VirtualSpace classes
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165 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
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166 public native void runMemoryUnitTests();
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167 public native void readFromNoaccessArea();
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168 public native long getThreadStackSize();
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169 public native long getThreadRemainingStackSize();
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170
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171 // CPU features
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172 public native String getCPUFeatures();
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173
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174 // Native extensions
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175 public native long getHeapUsageForContext(int context);
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176 public native long getHeapRegionCountForContext(int context);
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177 public native int getContextForObject(Object obj);
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178 public native void printRegionInfo(int context);
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179
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180 // VM flags
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181 public native void setBooleanVMFlag(String name, boolean value);
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182 public native void setIntxVMFlag(String name, long value);
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183 public native void setUintxVMFlag(String name, long value);
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184 public native void setUint64VMFlag(String name, long value);
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185 public native void setStringVMFlag(String name, String value);
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186 public native void setDoubleVMFlag(String name, double value);
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187 public native Boolean getBooleanVMFlag(String name);
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188 public native Long getIntxVMFlag(String name);
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189 public native Long getUintxVMFlag(String name);
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190 public native Long getUint64VMFlag(String name);
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191 public native String getStringVMFlag(String name);
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192 public native Double getDoubleVMFlag(String name);
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193 private final List<Function<String,Object>> flagsGetters = Arrays.asList(
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194 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
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195 this::getUint64VMFlag, this::getStringVMFlag, this::getDoubleVMFlag);
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196
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197 public Object getVMFlag(String name) {
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198 return flagsGetters.stream()
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199 .map(f -> f.apply(name))
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200 .filter(x -> x != null)
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201 .findAny()
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202 .orElse(null);
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203 }
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204 }