Mercurial > hg > graal-compiler
annotate test/gc/survivorAlignment/AlignmentHelper.java @ 20717:4b7c96fba3d8
8037968: Add tests on alignment of objects copied to survivor space
Reviewed-by: jmasa, dfazunen
author | fzhinkin |
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date | Wed, 26 Nov 2014 14:17:06 +0400 |
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1 /* |
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2 * Copyright (c) 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 import java.lang.management.MemoryPoolMXBean; |
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25 import java.util.Optional; |
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26 |
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27 import sun.hotspot.WhiteBox; |
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28 |
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29 /** |
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30 * Helper class aimed to provide information about alignment of objects in |
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31 * particular heap space, expected memory usage after objects' allocation so on. |
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32 */ |
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33 public class AlignmentHelper { |
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34 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
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35 |
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36 private static final long OBJECT_ALIGNMENT_IN_BYTES_FOR_32_VM = 8L; |
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37 |
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38 /** |
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39 * Max relative allowed actual memory usage deviation from expected memory |
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40 * usage. |
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41 */ |
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42 private static final float MAX_RELATIVE_DEVIATION = 0.05f; // 5% |
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43 |
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44 public static final long OBJECT_ALIGNMENT_IN_BYTES = Optional.ofNullable( |
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45 AlignmentHelper.WHITE_BOX.getIntxVMFlag("ObjectAlignmentInBytes")) |
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46 .orElse(AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES_FOR_32_VM); |
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47 |
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48 public static final long SURVIVOR_ALIGNMENT_IN_BYTES = Optional.ofNullable( |
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49 AlignmentHelper.WHITE_BOX.getIntxVMFlag("SurvivorAlignmentInBytes")) |
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50 .orElseThrow(() ->new AssertionError( |
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51 "Unable to get SurvivorAlignmentInBytes value")); |
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52 /** |
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53 * Min amount of memory that will be occupied by an object. |
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54 */ |
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55 public static final long MIN_OBJECT_SIZE |
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56 = AlignmentHelper.WHITE_BOX.getObjectSize(new Object()); |
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57 /** |
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58 * Min amount of memory that will be occupied by an empty byte array. |
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59 */ |
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60 public static final long MIN_ARRAY_SIZE |
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61 = AlignmentHelper.WHITE_BOX.getObjectSize(new byte[0]); |
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62 |
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63 /** |
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64 * Precision at which actual memory usage in a heap space represented by |
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65 * this sizing helper could be measured. |
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66 */ |
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67 private final long memoryUsageMeasurementPrecision; |
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68 /** |
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69 * Min amount of memory that will be occupied by an object allocated in a |
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70 * heap space represented by this sizing helper. |
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71 */ |
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72 private final long minObjectSizeInThisSpace; |
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73 /** |
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74 * Object's alignment in a heap space represented by this sizing helper. |
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75 */ |
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76 private final long objectAlignmentInThisRegion; |
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77 /** |
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78 * MemoryPoolMXBean associated with a heap space represented by this sizing |
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79 * helper. |
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80 */ |
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81 private final MemoryPoolMXBean poolMXBean; |
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82 |
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83 private static long alignUp(long value, long alignment) { |
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84 return ((value - 1) / alignment + 1) * alignment; |
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85 } |
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86 |
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87 protected AlignmentHelper(long memoryUsageMeasurementPrecision, |
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88 long objectAlignmentInThisRegion, long minObjectSizeInThisSpace, |
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89 MemoryPoolMXBean poolMXBean) { |
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90 this.memoryUsageMeasurementPrecision = memoryUsageMeasurementPrecision; |
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91 this.minObjectSizeInThisSpace = minObjectSizeInThisSpace; |
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92 this.objectAlignmentInThisRegion = objectAlignmentInThisRegion; |
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93 this.poolMXBean = poolMXBean; |
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94 } |
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95 |
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96 /** |
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97 * Returns how many objects have to be allocated to fill |
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98 * {@code memoryToFill} bytes in this heap space using objects of size |
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99 * {@code objectSize}. |
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100 */ |
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101 public int getObjectsCount(long memoryToFill, long objectSize) { |
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102 return (int) (memoryToFill / getObjectSizeInThisSpace(objectSize)); |
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103 } |
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104 |
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105 /** |
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106 * Returns amount of memory that {@code objectsCount} of objects with size |
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107 * {@code objectSize} will occupy this this space after allocation. |
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108 */ |
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109 public long getExpectedMemoryUsage(long objectSize, int objectsCount) { |
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110 long correctedObjectSize = getObjectSizeInThisSpace(objectSize); |
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111 return AlignmentHelper.alignUp(correctedObjectSize * objectsCount, |
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112 memoryUsageMeasurementPrecision); |
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113 } |
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114 |
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115 /** |
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116 * Returns current memory usage in this heap space. |
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117 */ |
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118 public long getActualMemoryUsage() { |
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119 return poolMXBean.getUsage().getUsed(); |
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120 } |
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121 |
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122 /** |
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123 * Returns maximum memory usage deviation from {@code expectedMemoryUsage} |
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124 * given the max allowed relative deviation equal to |
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125 * {@code relativeDeviation}. |
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126 * |
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127 * Note that value returned by this method is aligned according to |
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128 * memory measurement precision for this heap space. |
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129 */ |
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130 public long getAllowedMemoryUsageDeviation(long expectedMemoryUsage) { |
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131 long unalignedDeviation = (long) (expectedMemoryUsage * |
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132 AlignmentHelper.MAX_RELATIVE_DEVIATION); |
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133 return AlignmentHelper.alignUp(unalignedDeviation, |
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134 memoryUsageMeasurementPrecision); |
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135 } |
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136 |
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137 /** |
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138 * Returns amount of memory that will be occupied by an object with size |
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139 * {@code objectSize} in this heap space. |
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140 */ |
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141 public long getObjectSizeInThisSpace(long objectSize) { |
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142 objectSize = Math.max(objectSize, minObjectSizeInThisSpace); |
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143 |
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144 long alignedObjectSize = AlignmentHelper.alignUp(objectSize, |
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145 objectAlignmentInThisRegion); |
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146 long sizeDiff = alignedObjectSize - objectSize; |
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147 |
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148 // If there is not enough space to fit padding object, then object will |
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149 // be aligned to {@code 2 * objectAlignmentInThisRegion}. |
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150 if (sizeDiff >= AlignmentHelper.OBJECT_ALIGNMENT_IN_BYTES |
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151 && sizeDiff < AlignmentHelper.MIN_OBJECT_SIZE) { |
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152 alignedObjectSize += AlignmentHelper.MIN_OBJECT_SIZE; |
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153 alignedObjectSize = AlignmentHelper.alignUp(alignedObjectSize, |
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154 objectAlignmentInThisRegion); |
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155 } |
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156 |
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157 return alignedObjectSize; |
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158 } |
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159 @Override |
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160 public String toString() { |
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161 StringBuilder builder = new StringBuilder(); |
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162 |
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163 builder.append(String.format("AlignmentHelper for memory pool '%s':%n", |
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164 poolMXBean.getName())); |
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165 builder.append(String.format("Memory usage measurement precision: %d%n", |
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166 memoryUsageMeasurementPrecision)); |
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167 builder.append(String.format("Min object size in this space: %d%n", |
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168 minObjectSizeInThisSpace)); |
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169 builder.append(String.format("Object alignment in this space: %d%n", |
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170 objectAlignmentInThisRegion)); |
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171 |
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172 return builder.toString(); |
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173 } |
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174 } |