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annotate test/gc/survivorAlignment/AlignmentHelper.java @ 20915:916aac9fe6f7

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LinearScan: use RegisterAllocationConfig.
author Josef Eisl <josef.eisl@jku.at>
date Mon, 13 Apr 2015 15:10:55 +0200
parents 4b7c96fba3d8
children
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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 }