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annotate src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp @ 18041:52b4284cb496

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Merge with jdk8u20-b26
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 16:02:50 +0200
parents 89152779163c 78bbf4d43a14
children
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1 /*
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2 * Copyright (c) 2001, 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 #include "precompiled.hpp"
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26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
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27 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp"
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28 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
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29 #include "gc_implementation/parallelScavenge/psYoungGen.hpp"
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30 #include "gc_implementation/shared/gcUtil.hpp"
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31 #include "gc_implementation/shared/mutableNUMASpace.hpp"
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32 #include "gc_implementation/shared/spaceDecorator.hpp"
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33 #include "oops/oop.inline.hpp"
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34 #include "runtime/java.hpp"
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35
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36 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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37
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38 PSYoungGen::PSYoungGen(size_t initial_size,
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39 size_t min_size,
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40 size_t max_size) :
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41 _init_gen_size(initial_size),
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42 _min_gen_size(min_size),
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43 _max_gen_size(max_size)
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44 {}
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45
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46 void PSYoungGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) {
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47 assert(_init_gen_size != 0, "Should have a finite size");
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48 _virtual_space = new PSVirtualSpace(rs, alignment);
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49 if (!virtual_space()->expand_by(_init_gen_size)) {
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50 vm_exit_during_initialization("Could not reserve enough space for "
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51 "object heap");
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52 }
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53 }
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54
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55 void PSYoungGen::initialize(ReservedSpace rs, size_t alignment) {
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56 initialize_virtual_space(rs, alignment);
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57 initialize_work();
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58 }
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59
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60 void PSYoungGen::initialize_work() {
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61
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62 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(),
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63 (HeapWord*)virtual_space()->high_boundary());
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64
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65 MemRegion cmr((HeapWord*)virtual_space()->low(),
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66 (HeapWord*)virtual_space()->high());
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67 Universe::heap()->barrier_set()->resize_covered_region(cmr);
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68
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69 if (ZapUnusedHeapArea) {
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70 // Mangle newly committed space immediately because it
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71 // can be done here more simply that after the new
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72 // spaces have been computed.
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73 SpaceMangler::mangle_region(cmr);
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74 }
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75
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76 if (UseNUMA) {
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77 _eden_space = new MutableNUMASpace(virtual_space()->alignment());
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78 } else {
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79 _eden_space = new MutableSpace(virtual_space()->alignment());
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80 }
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81 _from_space = new MutableSpace(virtual_space()->alignment());
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82 _to_space = new MutableSpace(virtual_space()->alignment());
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83
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84 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) {
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85 vm_exit_during_initialization("Could not allocate a young gen space");
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86 }
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87
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88 // Allocate the mark sweep views of spaces
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89 _eden_mark_sweep =
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90 new PSMarkSweepDecorator(_eden_space, NULL, MarkSweepDeadRatio);
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91 _from_mark_sweep =
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92 new PSMarkSweepDecorator(_from_space, NULL, MarkSweepDeadRatio);
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93 _to_mark_sweep =
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94 new PSMarkSweepDecorator(_to_space, NULL, MarkSweepDeadRatio);
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95
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96 if (_eden_mark_sweep == NULL ||
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97 _from_mark_sweep == NULL ||
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98 _to_mark_sweep == NULL) {
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99 vm_exit_during_initialization("Could not complete allocation"
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100 " of the young generation");
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101 }
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102
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103 // Generation Counters - generation 0, 3 subspaces
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104 _gen_counters = new PSGenerationCounters("new", 0, 3, _virtual_space);
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105
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106 // Compute maximum space sizes for performance counters
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107 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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108 size_t alignment = heap->space_alignment();
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109 size_t size = virtual_space()->reserved_size();
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110
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111 size_t max_survivor_size;
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112 size_t max_eden_size;
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113
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114 if (UseAdaptiveSizePolicy) {
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115 max_survivor_size = size / MinSurvivorRatio;
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116
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117 // round the survivor space size down to the nearest alignment
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118 // and make sure its size is greater than 0.
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119 max_survivor_size = align_size_down(max_survivor_size, alignment);
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120 max_survivor_size = MAX2(max_survivor_size, alignment);
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121
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122 // set the maximum size of eden to be the size of the young gen
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123 // less two times the minimum survivor size. The minimum survivor
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124 // size for UseAdaptiveSizePolicy is one alignment.
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125 max_eden_size = size - 2 * alignment;
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126 } else {
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127 max_survivor_size = size / InitialSurvivorRatio;
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128
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129 // round the survivor space size down to the nearest alignment
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130 // and make sure its size is greater than 0.
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131 max_survivor_size = align_size_down(max_survivor_size, alignment);
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132 max_survivor_size = MAX2(max_survivor_size, alignment);
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133
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134 // set the maximum size of eden to be the size of the young gen
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135 // less two times the survivor size when the generation is 100%
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136 // committed. The minimum survivor size for -UseAdaptiveSizePolicy
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137 // is dependent on the committed portion (current capacity) of the
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138 // generation - the less space committed, the smaller the survivor
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139 // space, possibly as small as an alignment. However, we are interested
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140 // in the case where the young generation is 100% committed, as this
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141 // is the point where eden reachs its maximum size. At this point,
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142 // the size of a survivor space is max_survivor_size.
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143 max_eden_size = size - 2 * max_survivor_size;
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144 }
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145
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146 _eden_counters = new SpaceCounters("eden", 0, max_eden_size, _eden_space,
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147 _gen_counters);
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148 _from_counters = new SpaceCounters("s0", 1, max_survivor_size, _from_space,
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149 _gen_counters);
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150 _to_counters = new SpaceCounters("s1", 2, max_survivor_size, _to_space,
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151 _gen_counters);
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152
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153 compute_initial_space_boundaries();
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154 }
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155
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156 void PSYoungGen::compute_initial_space_boundaries() {
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157 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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158 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
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159
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160 // Compute sizes
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161 size_t alignment = heap->space_alignment();
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162 size_t size = virtual_space()->committed_size();
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163 assert(size >= 3 * alignment, "Young space is not large enough for eden + 2 survivors");
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164
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165 size_t survivor_size = size / InitialSurvivorRatio;
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166 survivor_size = align_size_down(survivor_size, alignment);
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167 // ... but never less than an alignment
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168 survivor_size = MAX2(survivor_size, alignment);
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169
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170 // Young generation is eden + 2 survivor spaces
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171 size_t eden_size = size - (2 * survivor_size);
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172
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173 // Now go ahead and set 'em.
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174 set_space_boundaries(eden_size, survivor_size);
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175 space_invariants();
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176
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177 if (UsePerfData) {
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178 _eden_counters->update_capacity();
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179 _from_counters->update_capacity();
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180 _to_counters->update_capacity();
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181 }
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182 }
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183
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184 void PSYoungGen::set_space_boundaries(size_t eden_size, size_t survivor_size) {
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185 assert(eden_size < virtual_space()->committed_size(), "just checking");
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186 assert(eden_size > 0 && survivor_size > 0, "just checking");
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187
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188 // Initial layout is Eden, to, from. After swapping survivor spaces,
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189 // that leaves us with Eden, from, to, which is step one in our two
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190 // step resize-with-live-data procedure.
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191 char *eden_start = virtual_space()->low();
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192 char *to_start = eden_start + eden_size;
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193 char *from_start = to_start + survivor_size;
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194 char *from_end = from_start + survivor_size;
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195
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196 assert(from_end == virtual_space()->high(), "just checking");
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197 assert(is_object_aligned((intptr_t)eden_start), "checking alignment");
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198 assert(is_object_aligned((intptr_t)to_start), "checking alignment");
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199 assert(is_object_aligned((intptr_t)from_start), "checking alignment");
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200
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201 MemRegion eden_mr((HeapWord*)eden_start, (HeapWord*)to_start);
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202 MemRegion to_mr ((HeapWord*)to_start, (HeapWord*)from_start);
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203 MemRegion from_mr((HeapWord*)from_start, (HeapWord*)from_end);
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204
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205 eden_space()->initialize(eden_mr, true, ZapUnusedHeapArea);
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206 to_space()->initialize(to_mr , true, ZapUnusedHeapArea);
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207 from_space()->initialize(from_mr, true, ZapUnusedHeapArea);
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208 }
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209
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210 #ifndef PRODUCT
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211 void PSYoungGen::space_invariants() {
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212 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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213 const size_t alignment = heap->space_alignment();
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214
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215 // Currently, our eden size cannot shrink to zero
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216 guarantee(eden_space()->capacity_in_bytes() >= alignment, "eden too small");
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217 guarantee(from_space()->capacity_in_bytes() >= alignment, "from too small");
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218 guarantee(to_space()->capacity_in_bytes() >= alignment, "to too small");
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219
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220 // Relationship of spaces to each other
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221 char* eden_start = (char*)eden_space()->bottom();
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222 char* eden_end = (char*)eden_space()->end();
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223 char* from_start = (char*)from_space()->bottom();
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224 char* from_end = (char*)from_space()->end();
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225 char* to_start = (char*)to_space()->bottom();
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226 char* to_end = (char*)to_space()->end();
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227
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228 guarantee(eden_start >= virtual_space()->low(), "eden bottom");
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229 guarantee(eden_start < eden_end, "eden space consistency");
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230 guarantee(from_start < from_end, "from space consistency");
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231 guarantee(to_start < to_end, "to space consistency");
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232
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233 // Check whether from space is below to space
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234 if (from_start < to_start) {
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235 // Eden, from, to
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236 guarantee(eden_end <= from_start, "eden/from boundary");
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237 guarantee(from_end <= to_start, "from/to boundary");
263
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238 guarantee(to_end <= virtual_space()->high(), "to end");
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239 } else {
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240 // Eden, to, from
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241 guarantee(eden_end <= to_start, "eden/to boundary");
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242 guarantee(to_end <= from_start, "to/from boundary");
263
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243 guarantee(from_end <= virtual_space()->high(), "from end");
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244 }
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245
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246 // More checks that the virtual space is consistent with the spaces
263
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247 assert(virtual_space()->committed_size() >=
0
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248 (eden_space()->capacity_in_bytes() +
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249 to_space()->capacity_in_bytes() +
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250 from_space()->capacity_in_bytes()), "Committed size is inconsistent");
263
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251 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(),
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252 "Space invariant");
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253 char* eden_top = (char*)eden_space()->top();
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254 char* from_top = (char*)from_space()->top();
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255 char* to_top = (char*)to_space()->top();
263
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256 assert(eden_top <= virtual_space()->high(), "eden top");
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257 assert(from_top <= virtual_space()->high(), "from top");
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258 assert(to_top <= virtual_space()->high(), "to top");
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259
263
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260 virtual_space()->verify();
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261 }
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262 #endif
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263
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264 void PSYoungGen::resize(size_t eden_size, size_t survivor_size) {
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265 // Resize the generation if needed. If the generation resize
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266 // reports false, do not attempt to resize the spaces.
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267 if (resize_generation(eden_size, survivor_size)) {
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268 // Then we lay out the spaces inside the generation
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269 resize_spaces(eden_size, survivor_size);
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270
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271 space_invariants();
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272
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273 if (PrintAdaptiveSizePolicy && Verbose) {
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274 gclog_or_tty->print_cr("Young generation size: "
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275 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT
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276 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT
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277 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT,
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278 eden_size, survivor_size, used_in_bytes(), capacity_in_bytes(),
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279 _max_gen_size, min_gen_size());
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280 }
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281 }
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282 }
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283
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284
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285 bool PSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) {
263
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286 const size_t alignment = virtual_space()->alignment();
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287 size_t orig_size = virtual_space()->committed_size();
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288 bool size_changed = false;
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289
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290 // There used to be this guarantee there.
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291 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments");
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292 // Code below forces this requirement. In addition the desired eden
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293 // size and disired survivor sizes are desired goals and may
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294 // exceed the total generation size.
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295
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296 assert(min_gen_size() <= orig_size && orig_size <= max_size(), "just checking");
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297
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298 // Adjust new generation size
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299 const size_t eden_plus_survivors =
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300 align_size_up(eden_size + 2 * survivor_size, alignment);
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301 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_size()),
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302 min_gen_size());
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303 assert(desired_size <= max_size(), "just checking");
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304
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305 if (desired_size > orig_size) {
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306 // Grow the generation
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307 size_t change = desired_size - orig_size;
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308 assert(change % alignment == 0, "just checking");
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309 HeapWord* prev_high = (HeapWord*) virtual_space()->high();
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310 if (!virtual_space()->expand_by(change)) {
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311 return false; // Error if we fail to resize!
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312 }
263
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313 if (ZapUnusedHeapArea) {
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314 // Mangle newly committed space immediately because it
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315 // can be done here more simply that after the new
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316 // spaces have been computed.
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317 HeapWord* new_high = (HeapWord*) virtual_space()->high();
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318 MemRegion mangle_region(prev_high, new_high);
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319 SpaceMangler::mangle_region(mangle_region);
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320 }
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321 size_changed = true;
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322 } else if (desired_size < orig_size) {
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323 size_t desired_change = orig_size - desired_size;
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324 assert(desired_change % alignment == 0, "just checking");
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325
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326 desired_change = limit_gen_shrink(desired_change);
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327
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328 if (desired_change > 0) {
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329 virtual_space()->shrink_by(desired_change);
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330 reset_survivors_after_shrink();
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331
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332 size_changed = true;
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333 }
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334 } else {
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335 if (Verbose && PrintGC) {
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336 if (orig_size == gen_size_limit()) {
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337 gclog_or_tty->print_cr("PSYoung generation size at maximum: "
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338 SIZE_FORMAT "K", orig_size/K);
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339 } else if (orig_size == min_gen_size()) {
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340 gclog_or_tty->print_cr("PSYoung generation size at minium: "
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341 SIZE_FORMAT "K", orig_size/K);
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342 }
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343 }
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344 }
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345
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346 if (size_changed) {
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347 post_resize();
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348
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349 if (Verbose && PrintGC) {
263
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350 size_t current_size = virtual_space()->committed_size();
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351 gclog_or_tty->print_cr("PSYoung generation size changed: "
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352 SIZE_FORMAT "K->" SIZE_FORMAT "K",
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353 orig_size/K, current_size/K);
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354 }
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355 }
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356
263
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357 guarantee(eden_plus_survivors <= virtual_space()->committed_size() ||
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358 virtual_space()->committed_size() == max_size(), "Sanity");
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359
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360 return true;
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361 }
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362
263
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363 #ifndef PRODUCT
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364 // In the numa case eden is not mangled so a survivor space
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365 // moving into a region previously occupied by a survivor
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366 // may find an unmangled region. Also in the PS case eden
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367 // to-space and from-space may not touch (i.e., there may be
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368 // gaps between them due to movement while resizing the
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369 // spaces). Those gaps must be mangled.
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370 void PSYoungGen::mangle_survivors(MutableSpace* s1,
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371 MemRegion s1MR,
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diff changeset
372 MutableSpace* s2,
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373 MemRegion s2MR) {
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374 // Check eden and gap between eden and from-space, in deciding
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diff changeset
375 // what to mangle in from-space. Check the gap between from-space
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
376 // and to-space when deciding what to mangle.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
377 //
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
378 // +--------+ +----+ +---+
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
379 // | eden | |s1 | |s2 |
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
380 // +--------+ +----+ +---+
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
381 // +-------+ +-----+
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
382 // |s1MR | |s2MR |
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
383 // +-------+ +-----+
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
384 // All of survivor-space is properly mangled so find the
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
385 // upper bound on the mangling for any portion above current s1.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
386 HeapWord* delta_end = MIN2(s1->bottom(), s1MR.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
387 MemRegion delta1_left;
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
388 if (s1MR.start() < delta_end) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
389 delta1_left = MemRegion(s1MR.start(), delta_end);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
390 s1->mangle_region(delta1_left);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
391 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
392 // Find any portion to the right of the current s1.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
393 HeapWord* delta_start = MAX2(s1->end(), s1MR.start());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
394 MemRegion delta1_right;
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
395 if (delta_start < s1MR.end()) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
396 delta1_right = MemRegion(delta_start, s1MR.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
397 s1->mangle_region(delta1_right);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
398 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
399
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
400 // Similarly for the second survivor space except that
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
401 // any of the new region that overlaps with the current
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
402 // region of the first survivor space has already been
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
403 // mangled.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
404 delta_end = MIN2(s2->bottom(), s2MR.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
405 delta_start = MAX2(s2MR.start(), s1->end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
406 MemRegion delta2_left;
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
407 if (s2MR.start() < delta_end) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
408 delta2_left = MemRegion(s2MR.start(), delta_end);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
409 s2->mangle_region(delta2_left);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
410 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
411 delta_start = MAX2(s2->end(), s2MR.start());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
412 MemRegion delta2_right;
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
413 if (delta_start < s2MR.end()) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
414 s2->mangle_region(delta2_right);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
415 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
416
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
417 if (TraceZapUnusedHeapArea) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
418 // s1
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
419 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") "
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
420 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")",
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
421 s1->bottom(), s1->end(), s1MR.start(), s1MR.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
422 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", "
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
423 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")",
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
424 delta1_left.start(), delta1_left.end(), delta1_right.start(),
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
425 delta1_right.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
426
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
427 // s2
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
428 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") "
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
429 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")",
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
430 s2->bottom(), s2->end(), s2MR.start(), s2MR.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
431 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", "
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
432 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")",
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
433 delta2_left.start(), delta2_left.end(), delta2_right.start(),
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
434 delta2_right.end());
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
435 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
436
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
437 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
438 #endif // NOT PRODUCT
0
a61af66fc99e Initial load
duke
parents:
diff changeset
439
a61af66fc99e Initial load
duke
parents:
diff changeset
440 void PSYoungGen::resize_spaces(size_t requested_eden_size,
a61af66fc99e Initial load
duke
parents:
diff changeset
441 size_t requested_survivor_size) {
a61af66fc99e Initial load
duke
parents:
diff changeset
442 assert(UseAdaptiveSizePolicy, "sanity check");
a61af66fc99e Initial load
duke
parents:
diff changeset
443 assert(requested_eden_size > 0 && requested_survivor_size > 0,
a61af66fc99e Initial load
duke
parents:
diff changeset
444 "just checking");
a61af66fc99e Initial load
duke
parents:
diff changeset
445
a61af66fc99e Initial load
duke
parents:
diff changeset
446 // We require eden and to space to be empty
a61af66fc99e Initial load
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parents:
diff changeset
447 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) {
a61af66fc99e Initial load
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parents:
diff changeset
448 return;
a61af66fc99e Initial load
duke
parents:
diff changeset
449 }
a61af66fc99e Initial load
duke
parents:
diff changeset
450
a61af66fc99e Initial load
duke
parents:
diff changeset
451 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
452 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: "
a61af66fc99e Initial load
duke
parents:
diff changeset
453 SIZE_FORMAT
a61af66fc99e Initial load
duke
parents:
diff changeset
454 ", requested_survivor_size: " SIZE_FORMAT ")",
a61af66fc99e Initial load
duke
parents:
diff changeset
455 requested_eden_size, requested_survivor_size);
a61af66fc99e Initial load
duke
parents:
diff changeset
456 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") "
a61af66fc99e Initial load
duke
parents:
diff changeset
457 SIZE_FORMAT,
a61af66fc99e Initial load
duke
parents:
diff changeset
458 eden_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
459 eden_space()->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
460 pointer_delta(eden_space()->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
461 eden_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
462 sizeof(char)));
a61af66fc99e Initial load
duke
parents:
diff changeset
463 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") "
a61af66fc99e Initial load
duke
parents:
diff changeset
464 SIZE_FORMAT,
a61af66fc99e Initial load
duke
parents:
diff changeset
465 from_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
466 from_space()->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
467 pointer_delta(from_space()->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
468 from_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
469 sizeof(char)));
a61af66fc99e Initial load
duke
parents:
diff changeset
470 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") "
a61af66fc99e Initial load
duke
parents:
diff changeset
471 SIZE_FORMAT,
a61af66fc99e Initial load
duke
parents:
diff changeset
472 to_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
473 to_space()->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
474 pointer_delta( to_space()->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
475 to_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
476 sizeof(char)));
a61af66fc99e Initial load
duke
parents:
diff changeset
477 }
a61af66fc99e Initial load
duke
parents:
diff changeset
478
a61af66fc99e Initial load
duke
parents:
diff changeset
479 // There's nothing to do if the new sizes are the same as the current
a61af66fc99e Initial load
duke
parents:
diff changeset
480 if (requested_survivor_size == to_space()->capacity_in_bytes() &&
a61af66fc99e Initial load
duke
parents:
diff changeset
481 requested_survivor_size == from_space()->capacity_in_bytes() &&
a61af66fc99e Initial load
duke
parents:
diff changeset
482 requested_eden_size == eden_space()->capacity_in_bytes()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
483 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
484 gclog_or_tty->print_cr(" capacities are the right sizes, returning");
a61af66fc99e Initial load
duke
parents:
diff changeset
485 }
a61af66fc99e Initial load
duke
parents:
diff changeset
486 return;
a61af66fc99e Initial load
duke
parents:
diff changeset
487 }
a61af66fc99e Initial load
duke
parents:
diff changeset
488
a61af66fc99e Initial load
duke
parents:
diff changeset
489 char* eden_start = (char*)eden_space()->bottom();
a61af66fc99e Initial load
duke
parents:
diff changeset
490 char* eden_end = (char*)eden_space()->end();
a61af66fc99e Initial load
duke
parents:
diff changeset
491 char* from_start = (char*)from_space()->bottom();
a61af66fc99e Initial load
duke
parents:
diff changeset
492 char* from_end = (char*)from_space()->end();
a61af66fc99e Initial load
duke
parents:
diff changeset
493 char* to_start = (char*)to_space()->bottom();
a61af66fc99e Initial load
duke
parents:
diff changeset
494 char* to_end = (char*)to_space()->end();
a61af66fc99e Initial load
duke
parents:
diff changeset
495
a61af66fc99e Initial load
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parents:
diff changeset
496 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
13060
8f07aa079343 8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents: 7455
diff changeset
497 const size_t alignment = heap->space_alignment();
0
a61af66fc99e Initial load
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parents:
diff changeset
498 const bool maintain_minimum =
a61af66fc99e Initial load
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parents:
diff changeset
499 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size();
a61af66fc99e Initial load
duke
parents:
diff changeset
500
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
501 bool eden_from_to_order = from_start < to_start;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
502 // Check whether from space is below to space
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
503 if (eden_from_to_order) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
504 // Eden, from, to
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
505 eden_from_to_order = true;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
506 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
507 gclog_or_tty->print_cr(" Eden, from, to:");
a61af66fc99e Initial load
duke
parents:
diff changeset
508 }
a61af66fc99e Initial load
duke
parents:
diff changeset
509
a61af66fc99e Initial load
duke
parents:
diff changeset
510 // Set eden
a61af66fc99e Initial load
duke
parents:
diff changeset
511 // "requested_eden_size" is a goal for the size of eden
a61af66fc99e Initial load
duke
parents:
diff changeset
512 // and may not be attainable. "eden_size" below is
a61af66fc99e Initial load
duke
parents:
diff changeset
513 // calculated based on the location of from-space and
a61af66fc99e Initial load
duke
parents:
diff changeset
514 // the goal for the size of eden. from-space is
a61af66fc99e Initial load
duke
parents:
diff changeset
515 // fixed in place because it contains live data.
a61af66fc99e Initial load
duke
parents:
diff changeset
516 // The calculation is done this way to avoid 32bit
a61af66fc99e Initial load
duke
parents:
diff changeset
517 // overflow (i.e., eden_start + requested_eden_size
a61af66fc99e Initial load
duke
parents:
diff changeset
518 // may too large for representation in 32bits).
a61af66fc99e Initial load
duke
parents:
diff changeset
519 size_t eden_size;
a61af66fc99e Initial load
duke
parents:
diff changeset
520 if (maintain_minimum) {
a61af66fc99e Initial load
duke
parents:
diff changeset
521 // Only make eden larger than the requested size if
a61af66fc99e Initial load
duke
parents:
diff changeset
522 // the minimum size of the generation has to be maintained.
a61af66fc99e Initial load
duke
parents:
diff changeset
523 // This could be done in general but policy at a higher
a61af66fc99e Initial load
duke
parents:
diff changeset
524 // level is determining a requested size for eden and that
a61af66fc99e Initial load
duke
parents:
diff changeset
525 // should be honored unless there is a fundamental reason.
a61af66fc99e Initial load
duke
parents:
diff changeset
526 eden_size = pointer_delta(from_start,
a61af66fc99e Initial load
duke
parents:
diff changeset
527 eden_start,
a61af66fc99e Initial load
duke
parents:
diff changeset
528 sizeof(char));
a61af66fc99e Initial load
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parents:
diff changeset
529 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
530 eden_size = MIN2(requested_eden_size,
a61af66fc99e Initial load
duke
parents:
diff changeset
531 pointer_delta(from_start, eden_start, sizeof(char)));
a61af66fc99e Initial load
duke
parents:
diff changeset
532 }
a61af66fc99e Initial load
duke
parents:
diff changeset
533
a61af66fc99e Initial load
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parents:
diff changeset
534 eden_end = eden_start + eden_size;
1489
cff162798819 6888953: some calls to function-like macros are missing semicolons
jcoomes
parents: 579
diff changeset
535 assert(eden_end >= eden_start, "addition overflowed");
0
a61af66fc99e Initial load
duke
parents:
diff changeset
536
a61af66fc99e Initial load
duke
parents:
diff changeset
537 // To may resize into from space as long as it is clear of live data.
a61af66fc99e Initial load
duke
parents:
diff changeset
538 // From space must remain page aligned, though, so we need to do some
a61af66fc99e Initial load
duke
parents:
diff changeset
539 // extra calculations.
a61af66fc99e Initial load
duke
parents:
diff changeset
540
a61af66fc99e Initial load
duke
parents:
diff changeset
541 // First calculate an optimal to-space
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
542 to_end = (char*)virtual_space()->high();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
543 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size,
a61af66fc99e Initial load
duke
parents:
diff changeset
544 sizeof(char));
a61af66fc99e Initial load
duke
parents:
diff changeset
545
a61af66fc99e Initial load
duke
parents:
diff changeset
546 // Does the optimal to-space overlap from-space?
a61af66fc99e Initial load
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parents:
diff changeset
547 if (to_start < (char*)from_space()->end()) {
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parents:
diff changeset
548 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load
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parents:
diff changeset
549
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parents:
diff changeset
550 // Calculate the minimum offset possible for from_end
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parents:
diff changeset
551 size_t from_size = pointer_delta(from_space()->top(), from_start, sizeof(char));
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parents:
diff changeset
552
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parents:
diff changeset
553 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME!
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parents:
diff changeset
554 if (from_size == 0) {
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parents:
diff changeset
555 from_size = alignment;
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parents:
diff changeset
556 } else {
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parents:
diff changeset
557 from_size = align_size_up(from_size, alignment);
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parents:
diff changeset
558 }
a61af66fc99e Initial load
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parents:
diff changeset
559
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parents:
diff changeset
560 from_end = from_start + from_size;
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parents:
diff changeset
561 assert(from_end > from_start, "addition overflow or from_size problem");
a61af66fc99e Initial load
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parents:
diff changeset
562
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parents:
diff changeset
563 guarantee(from_end <= (char*)from_space()->end(), "from_end moved to the right");
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parents:
diff changeset
564
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duke
parents:
diff changeset
565 // Now update to_start with the new from_end
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duke
parents:
diff changeset
566 to_start = MAX2(from_end, to_start);
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parents:
diff changeset
567 }
a61af66fc99e Initial load
duke
parents:
diff changeset
568
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duke
parents:
diff changeset
569 guarantee(to_start != to_end, "to space is zero sized");
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parents:
diff changeset
570
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parents:
diff changeset
571 if (PrintAdaptiveSizePolicy && Verbose) {
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duke
parents:
diff changeset
572 gclog_or_tty->print_cr(" [eden_start .. eden_end): "
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duke
parents:
diff changeset
573 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
a61af66fc99e Initial load
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parents:
diff changeset
574 eden_start,
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parents:
diff changeset
575 eden_end,
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parents:
diff changeset
576 pointer_delta(eden_end, eden_start, sizeof(char)));
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parents:
diff changeset
577 gclog_or_tty->print_cr(" [from_start .. from_end): "
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parents:
diff changeset
578 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
a61af66fc99e Initial load
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parents:
diff changeset
579 from_start,
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parents:
diff changeset
580 from_end,
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parents:
diff changeset
581 pointer_delta(from_end, from_start, sizeof(char)));
a61af66fc99e Initial load
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parents:
diff changeset
582 gclog_or_tty->print_cr(" [ to_start .. to_end): "
a61af66fc99e Initial load
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parents:
diff changeset
583 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
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duke
parents:
diff changeset
584 to_start,
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duke
parents:
diff changeset
585 to_end,
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parents:
diff changeset
586 pointer_delta( to_end, to_start, sizeof(char)));
a61af66fc99e Initial load
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parents:
diff changeset
587 }
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parents:
diff changeset
588 } else {
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parents:
diff changeset
589 // Eden, to, from
a61af66fc99e Initial load
duke
parents:
diff changeset
590 if (PrintAdaptiveSizePolicy && Verbose) {
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parents:
diff changeset
591 gclog_or_tty->print_cr(" Eden, to, from:");
a61af66fc99e Initial load
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parents:
diff changeset
592 }
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parents:
diff changeset
593
a61af66fc99e Initial load
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parents:
diff changeset
594 // To space gets priority over eden resizing. Note that we position
a61af66fc99e Initial load
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parents:
diff changeset
595 // to space as if we were able to resize from space, even though from
a61af66fc99e Initial load
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parents:
diff changeset
596 // space is not modified.
a61af66fc99e Initial load
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parents:
diff changeset
597 // Giving eden priority was tried and gave poorer performance.
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
598 to_end = (char*)pointer_delta(virtual_space()->high(),
0
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duke
parents:
diff changeset
599 (char*)requested_survivor_size,
a61af66fc99e Initial load
duke
parents:
diff changeset
600 sizeof(char));
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parents:
diff changeset
601 to_end = MIN2(to_end, from_start);
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parents:
diff changeset
602 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size,
a61af66fc99e Initial load
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parents:
diff changeset
603 sizeof(char));
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parents:
diff changeset
604 // if the space sizes are to be increased by several times then
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duke
parents:
diff changeset
605 // 'to_start' will point beyond the young generation. In this case
a61af66fc99e Initial load
duke
parents:
diff changeset
606 // 'to_start' should be adjusted.
a61af66fc99e Initial load
duke
parents:
diff changeset
607 to_start = MAX2(to_start, eden_start + alignment);
a61af66fc99e Initial load
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parents:
diff changeset
608
a61af66fc99e Initial load
duke
parents:
diff changeset
609 // Compute how big eden can be, then adjust end.
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parents:
diff changeset
610 // See comments above on calculating eden_end.
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parents:
diff changeset
611 size_t eden_size;
a61af66fc99e Initial load
duke
parents:
diff changeset
612 if (maintain_minimum) {
a61af66fc99e Initial load
duke
parents:
diff changeset
613 eden_size = pointer_delta(to_start, eden_start, sizeof(char));
a61af66fc99e Initial load
duke
parents:
diff changeset
614 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
615 eden_size = MIN2(requested_eden_size,
a61af66fc99e Initial load
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parents:
diff changeset
616 pointer_delta(to_start, eden_start, sizeof(char)));
a61af66fc99e Initial load
duke
parents:
diff changeset
617 }
a61af66fc99e Initial load
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parents:
diff changeset
618 eden_end = eden_start + eden_size;
1489
cff162798819 6888953: some calls to function-like macros are missing semicolons
jcoomes
parents: 579
diff changeset
619 assert(eden_end >= eden_start, "addition overflowed");
0
a61af66fc99e Initial load
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parents:
diff changeset
620
a61af66fc99e Initial load
duke
parents:
diff changeset
621 // Could choose to not let eden shrink
a61af66fc99e Initial load
duke
parents:
diff changeset
622 // to_start = MAX2(to_start, eden_end);
a61af66fc99e Initial load
duke
parents:
diff changeset
623
a61af66fc99e Initial load
duke
parents:
diff changeset
624 // Don't let eden shrink down to 0 or less.
a61af66fc99e Initial load
duke
parents:
diff changeset
625 eden_end = MAX2(eden_end, eden_start + alignment);
a61af66fc99e Initial load
duke
parents:
diff changeset
626 to_start = MAX2(to_start, eden_end);
a61af66fc99e Initial load
duke
parents:
diff changeset
627
a61af66fc99e Initial load
duke
parents:
diff changeset
628 if (PrintAdaptiveSizePolicy && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
629 gclog_or_tty->print_cr(" [eden_start .. eden_end): "
a61af66fc99e Initial load
duke
parents:
diff changeset
630 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
a61af66fc99e Initial load
duke
parents:
diff changeset
631 eden_start,
a61af66fc99e Initial load
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parents:
diff changeset
632 eden_end,
a61af66fc99e Initial load
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parents:
diff changeset
633 pointer_delta(eden_end, eden_start, sizeof(char)));
a61af66fc99e Initial load
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parents:
diff changeset
634 gclog_or_tty->print_cr(" [ to_start .. to_end): "
a61af66fc99e Initial load
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parents:
diff changeset
635 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
a61af66fc99e Initial load
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parents:
diff changeset
636 to_start,
a61af66fc99e Initial load
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parents:
diff changeset
637 to_end,
a61af66fc99e Initial load
duke
parents:
diff changeset
638 pointer_delta( to_end, to_start, sizeof(char)));
a61af66fc99e Initial load
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parents:
diff changeset
639 gclog_or_tty->print_cr(" [from_start .. from_end): "
a61af66fc99e Initial load
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parents:
diff changeset
640 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT,
a61af66fc99e Initial load
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parents:
diff changeset
641 from_start,
a61af66fc99e Initial load
duke
parents:
diff changeset
642 from_end,
a61af66fc99e Initial load
duke
parents:
diff changeset
643 pointer_delta(from_end, from_start, sizeof(char)));
a61af66fc99e Initial load
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parents:
diff changeset
644 }
a61af66fc99e Initial load
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parents:
diff changeset
645 }
a61af66fc99e Initial load
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parents:
diff changeset
646
a61af66fc99e Initial load
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parents:
diff changeset
647
a61af66fc99e Initial load
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parents:
diff changeset
648 guarantee((HeapWord*)from_start <= from_space()->bottom(),
a61af66fc99e Initial load
duke
parents:
diff changeset
649 "from start moved to the right");
a61af66fc99e Initial load
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parents:
diff changeset
650 guarantee((HeapWord*)from_end >= from_space()->top(),
a61af66fc99e Initial load
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parents:
diff changeset
651 "from end moved into live data");
a61af66fc99e Initial load
duke
parents:
diff changeset
652 assert(is_object_aligned((intptr_t)eden_start), "checking alignment");
a61af66fc99e Initial load
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parents:
diff changeset
653 assert(is_object_aligned((intptr_t)from_start), "checking alignment");
a61af66fc99e Initial load
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parents:
diff changeset
654 assert(is_object_aligned((intptr_t)to_start), "checking alignment");
a61af66fc99e Initial load
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parents:
diff changeset
655
a61af66fc99e Initial load
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parents:
diff changeset
656 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end);
a61af66fc99e Initial load
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parents:
diff changeset
657 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end);
a61af66fc99e Initial load
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parents:
diff changeset
658 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end);
a61af66fc99e Initial load
duke
parents:
diff changeset
659
a61af66fc99e Initial load
duke
parents:
diff changeset
660 // Let's make sure the call to initialize doesn't reset "top"!
a61af66fc99e Initial load
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parents:
diff changeset
661 HeapWord* old_from_top = from_space()->top();
a61af66fc99e Initial load
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parents:
diff changeset
662
a61af66fc99e Initial load
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parents:
diff changeset
663 // For PrintAdaptiveSizePolicy block below
a61af66fc99e Initial load
duke
parents:
diff changeset
664 size_t old_from = from_space()->capacity_in_bytes();
a61af66fc99e Initial load
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parents:
diff changeset
665 size_t old_to = to_space()->capacity_in_bytes();
a61af66fc99e Initial load
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parents:
diff changeset
666
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
667 if (ZapUnusedHeapArea) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
668 // NUMA is a special case because a numa space is not mangled
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
669 // in order to not prematurely bind its address to memory to
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
670 // the wrong memory (i.e., don't want the GC thread to first
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
671 // touch the memory). The survivor spaces are not numa
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
672 // spaces and are mangled.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
673 if (UseNUMA) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
674 if (eden_from_to_order) {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
675 mangle_survivors(from_space(), fromMR, to_space(), toMR);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
676 } else {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
677 mangle_survivors(to_space(), toMR, from_space(), fromMR);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
678 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
679 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
680
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
681 // If not mangling the spaces, do some checking to verify that
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
682 // the spaces are already mangled.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
683 // The spaces should be correctly mangled at this point so
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
684 // do some checking here. Note that they are not being mangled
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
685 // in the calls to initialize().
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
686 // Must check mangling before the spaces are reshaped. Otherwise,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
687 // the bottom or end of one space may have moved into an area
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
688 // covered by another space and a failure of the check may
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
689 // not correctly indicate which space is not properly mangled.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
690 HeapWord* limit = (HeapWord*) virtual_space()->high();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
691 eden_space()->check_mangled_unused_area(limit);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
692 from_space()->check_mangled_unused_area(limit);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
693 to_space()->check_mangled_unused_area(limit);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
694 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
695 // When an existing space is being initialized, it is not
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
696 // mangled because the space has been previously mangled.
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
697 eden_space()->initialize(edenMR,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
698 SpaceDecorator::Clear,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
699 SpaceDecorator::DontMangle);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
700 to_space()->initialize(toMR,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
701 SpaceDecorator::Clear,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
702 SpaceDecorator::DontMangle);
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
703 from_space()->initialize(fromMR,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
704 SpaceDecorator::DontClear,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
705 SpaceDecorator::DontMangle);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
706
a61af66fc99e Initial load
duke
parents:
diff changeset
707 assert(from_space()->top() == old_from_top, "from top changed!");
a61af66fc99e Initial load
duke
parents:
diff changeset
708
a61af66fc99e Initial load
duke
parents:
diff changeset
709 if (PrintAdaptiveSizePolicy) {
a61af66fc99e Initial load
duke
parents:
diff changeset
710 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
a61af66fc99e Initial load
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parents:
diff changeset
711 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
a61af66fc99e Initial load
duke
parents:
diff changeset
712
a61af66fc99e Initial load
duke
parents:
diff changeset
713 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: "
a61af66fc99e Initial load
duke
parents:
diff changeset
714 "collection: %d "
a61af66fc99e Initial load
duke
parents:
diff changeset
715 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> "
a61af66fc99e Initial load
duke
parents:
diff changeset
716 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ",
a61af66fc99e Initial load
duke
parents:
diff changeset
717 heap->total_collections(),
a61af66fc99e Initial load
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parents:
diff changeset
718 old_from, old_to,
a61af66fc99e Initial load
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parents:
diff changeset
719 from_space()->capacity_in_bytes(),
a61af66fc99e Initial load
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parents:
diff changeset
720 to_space()->capacity_in_bytes());
a61af66fc99e Initial load
duke
parents:
diff changeset
721 gclog_or_tty->cr();
a61af66fc99e Initial load
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parents:
diff changeset
722 }
a61af66fc99e Initial load
duke
parents:
diff changeset
723 }
a61af66fc99e Initial load
duke
parents:
diff changeset
724
a61af66fc99e Initial load
duke
parents:
diff changeset
725 void PSYoungGen::swap_spaces() {
a61af66fc99e Initial load
duke
parents:
diff changeset
726 MutableSpace* s = from_space();
a61af66fc99e Initial load
duke
parents:
diff changeset
727 _from_space = to_space();
a61af66fc99e Initial load
duke
parents:
diff changeset
728 _to_space = s;
a61af66fc99e Initial load
duke
parents:
diff changeset
729
a61af66fc99e Initial load
duke
parents:
diff changeset
730 // Now update the decorators.
a61af66fc99e Initial load
duke
parents:
diff changeset
731 PSMarkSweepDecorator* md = from_mark_sweep();
a61af66fc99e Initial load
duke
parents:
diff changeset
732 _from_mark_sweep = to_mark_sweep();
a61af66fc99e Initial load
duke
parents:
diff changeset
733 _to_mark_sweep = md;
a61af66fc99e Initial load
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parents:
diff changeset
734
a61af66fc99e Initial load
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parents:
diff changeset
735 assert(from_mark_sweep()->space() == from_space(), "Sanity");
a61af66fc99e Initial load
duke
parents:
diff changeset
736 assert(to_mark_sweep()->space() == to_space(), "Sanity");
a61af66fc99e Initial load
duke
parents:
diff changeset
737 }
a61af66fc99e Initial load
duke
parents:
diff changeset
738
a61af66fc99e Initial load
duke
parents:
diff changeset
739 size_t PSYoungGen::capacity_in_bytes() const {
a61af66fc99e Initial load
duke
parents:
diff changeset
740 return eden_space()->capacity_in_bytes()
a61af66fc99e Initial load
duke
parents:
diff changeset
741 + from_space()->capacity_in_bytes(); // to_space() is only used during scavenge
a61af66fc99e Initial load
duke
parents:
diff changeset
742 }
a61af66fc99e Initial load
duke
parents:
diff changeset
743
a61af66fc99e Initial load
duke
parents:
diff changeset
744
a61af66fc99e Initial load
duke
parents:
diff changeset
745 size_t PSYoungGen::used_in_bytes() const {
a61af66fc99e Initial load
duke
parents:
diff changeset
746 return eden_space()->used_in_bytes()
a61af66fc99e Initial load
duke
parents:
diff changeset
747 + from_space()->used_in_bytes(); // to_space() is only used during scavenge
a61af66fc99e Initial load
duke
parents:
diff changeset
748 }
a61af66fc99e Initial load
duke
parents:
diff changeset
749
a61af66fc99e Initial load
duke
parents:
diff changeset
750
a61af66fc99e Initial load
duke
parents:
diff changeset
751 size_t PSYoungGen::free_in_bytes() const {
a61af66fc99e Initial load
duke
parents:
diff changeset
752 return eden_space()->free_in_bytes()
a61af66fc99e Initial load
duke
parents:
diff changeset
753 + from_space()->free_in_bytes(); // to_space() is only used during scavenge
a61af66fc99e Initial load
duke
parents:
diff changeset
754 }
a61af66fc99e Initial load
duke
parents:
diff changeset
755
a61af66fc99e Initial load
duke
parents:
diff changeset
756 size_t PSYoungGen::capacity_in_words() const {
a61af66fc99e Initial load
duke
parents:
diff changeset
757 return eden_space()->capacity_in_words()
a61af66fc99e Initial load
duke
parents:
diff changeset
758 + from_space()->capacity_in_words(); // to_space() is only used during scavenge
a61af66fc99e Initial load
duke
parents:
diff changeset
759 }
a61af66fc99e Initial load
duke
parents:
diff changeset
760
a61af66fc99e Initial load
duke
parents:
diff changeset
761
a61af66fc99e Initial load
duke
parents:
diff changeset
762 size_t PSYoungGen::used_in_words() const {
a61af66fc99e Initial load
duke
parents:
diff changeset
763 return eden_space()->used_in_words()
a61af66fc99e Initial load
duke
parents:
diff changeset
764 + from_space()->used_in_words(); // to_space() is only used during scavenge
a61af66fc99e Initial load
duke
parents:
diff changeset
765 }
a61af66fc99e Initial load
duke
parents:
diff changeset
766
a61af66fc99e Initial load
duke
parents:
diff changeset
767
a61af66fc99e Initial load
duke
parents:
diff changeset
768 size_t PSYoungGen::free_in_words() const {
a61af66fc99e Initial load
duke
parents:
diff changeset
769 return eden_space()->free_in_words()
a61af66fc99e Initial load
duke
parents:
diff changeset
770 + from_space()->free_in_words(); // to_space() is only used during scavenge
a61af66fc99e Initial load
duke
parents:
diff changeset
771 }
a61af66fc99e Initial load
duke
parents:
diff changeset
772
a61af66fc99e Initial load
duke
parents:
diff changeset
773 void PSYoungGen::object_iterate(ObjectClosure* blk) {
a61af66fc99e Initial load
duke
parents:
diff changeset
774 eden_space()->object_iterate(blk);
a61af66fc99e Initial load
duke
parents:
diff changeset
775 from_space()->object_iterate(blk);
a61af66fc99e Initial load
duke
parents:
diff changeset
776 to_space()->object_iterate(blk);
a61af66fc99e Initial load
duke
parents:
diff changeset
777 }
a61af66fc99e Initial load
duke
parents:
diff changeset
778
a61af66fc99e Initial load
duke
parents:
diff changeset
779 void PSYoungGen::precompact() {
a61af66fc99e Initial load
duke
parents:
diff changeset
780 eden_mark_sweep()->precompact();
a61af66fc99e Initial load
duke
parents:
diff changeset
781 from_mark_sweep()->precompact();
a61af66fc99e Initial load
duke
parents:
diff changeset
782 to_mark_sweep()->precompact();
a61af66fc99e Initial load
duke
parents:
diff changeset
783 }
a61af66fc99e Initial load
duke
parents:
diff changeset
784
a61af66fc99e Initial load
duke
parents:
diff changeset
785 void PSYoungGen::adjust_pointers() {
a61af66fc99e Initial load
duke
parents:
diff changeset
786 eden_mark_sweep()->adjust_pointers();
a61af66fc99e Initial load
duke
parents:
diff changeset
787 from_mark_sweep()->adjust_pointers();
a61af66fc99e Initial load
duke
parents:
diff changeset
788 to_mark_sweep()->adjust_pointers();
a61af66fc99e Initial load
duke
parents:
diff changeset
789 }
a61af66fc99e Initial load
duke
parents:
diff changeset
790
a61af66fc99e Initial load
duke
parents:
diff changeset
791 void PSYoungGen::compact() {
a61af66fc99e Initial load
duke
parents:
diff changeset
792 eden_mark_sweep()->compact(ZapUnusedHeapArea);
a61af66fc99e Initial load
duke
parents:
diff changeset
793 from_mark_sweep()->compact(ZapUnusedHeapArea);
a61af66fc99e Initial load
duke
parents:
diff changeset
794 // Mark sweep stores preserved markOops in to space, don't disturb!
a61af66fc99e Initial load
duke
parents:
diff changeset
795 to_mark_sweep()->compact(false);
a61af66fc99e Initial load
duke
parents:
diff changeset
796 }
a61af66fc99e Initial load
duke
parents:
diff changeset
797
a61af66fc99e Initial load
duke
parents:
diff changeset
798 void PSYoungGen::print() const { print_on(tty); }
a61af66fc99e Initial load
duke
parents:
diff changeset
799 void PSYoungGen::print_on(outputStream* st) const {
a61af66fc99e Initial load
duke
parents:
diff changeset
800 st->print(" %-15s", "PSYoungGen");
a61af66fc99e Initial load
duke
parents:
diff changeset
801 if (PrintGCDetails && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
802 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT,
a61af66fc99e Initial load
duke
parents:
diff changeset
803 capacity_in_bytes(), used_in_bytes());
a61af66fc99e Initial load
duke
parents:
diff changeset
804 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
805 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K",
a61af66fc99e Initial load
duke
parents:
diff changeset
806 capacity_in_bytes()/K, used_in_bytes()/K);
a61af66fc99e Initial load
duke
parents:
diff changeset
807 }
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
808 virtual_space()->print_space_boundaries_on(st);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
809 st->print(" eden"); eden_space()->print_on(st);
a61af66fc99e Initial load
duke
parents:
diff changeset
810 st->print(" from"); from_space()->print_on(st);
a61af66fc99e Initial load
duke
parents:
diff changeset
811 st->print(" to "); to_space()->print_on(st);
a61af66fc99e Initial load
duke
parents:
diff changeset
812 }
a61af66fc99e Initial load
duke
parents:
diff changeset
813
7455
0b54ffe4c2d3 8005672: Clean up some changes to GC logging with GCCause's
jmasa
parents: 6008
diff changeset
814 // Note that a space is not printed before the [NAME:
0
a61af66fc99e Initial load
duke
parents:
diff changeset
815 void PSYoungGen::print_used_change(size_t prev_used) const {
7455
0b54ffe4c2d3 8005672: Clean up some changes to GC logging with GCCause's
jmasa
parents: 6008
diff changeset
816 gclog_or_tty->print("[%s:", name());
0
a61af66fc99e Initial load
duke
parents:
diff changeset
817 gclog_or_tty->print(" " SIZE_FORMAT "K"
a61af66fc99e Initial load
duke
parents:
diff changeset
818 "->" SIZE_FORMAT "K"
a61af66fc99e Initial load
duke
parents:
diff changeset
819 "(" SIZE_FORMAT "K)",
a61af66fc99e Initial load
duke
parents:
diff changeset
820 prev_used / K, used_in_bytes() / K,
a61af66fc99e Initial load
duke
parents:
diff changeset
821 capacity_in_bytes() / K);
a61af66fc99e Initial load
duke
parents:
diff changeset
822 gclog_or_tty->print("]");
a61af66fc99e Initial load
duke
parents:
diff changeset
823 }
a61af66fc99e Initial load
duke
parents:
diff changeset
824
a61af66fc99e Initial load
duke
parents:
diff changeset
825 size_t PSYoungGen::available_for_expansion() {
a61af66fc99e Initial load
duke
parents:
diff changeset
826 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
827 return 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
828 }
a61af66fc99e Initial load
duke
parents:
diff changeset
829
a61af66fc99e Initial load
duke
parents:
diff changeset
830 size_t PSYoungGen::available_for_contraction() {
a61af66fc99e Initial load
duke
parents:
diff changeset
831 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
832 return 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
833 }
a61af66fc99e Initial load
duke
parents:
diff changeset
834
a61af66fc99e Initial load
duke
parents:
diff changeset
835 size_t PSYoungGen::available_to_min_gen() {
a61af66fc99e Initial load
duke
parents:
diff changeset
836 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant");
a61af66fc99e Initial load
duke
parents:
diff changeset
837 return virtual_space()->committed_size() - min_gen_size();
a61af66fc99e Initial load
duke
parents:
diff changeset
838 }
a61af66fc99e Initial load
duke
parents:
diff changeset
839
a61af66fc99e Initial load
duke
parents:
diff changeset
840 // This method assumes that from-space has live data and that
a61af66fc99e Initial load
duke
parents:
diff changeset
841 // any shrinkage of the young gen is limited by location of
a61af66fc99e Initial load
duke
parents:
diff changeset
842 // from-space.
a61af66fc99e Initial load
duke
parents:
diff changeset
843 size_t PSYoungGen::available_to_live() {
a61af66fc99e Initial load
duke
parents:
diff changeset
844 size_t delta_in_survivor = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
845 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
13060
8f07aa079343 8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents: 7455
diff changeset
846 const size_t space_alignment = heap->space_alignment();
8f07aa079343 8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents: 7455
diff changeset
847 const size_t gen_alignment = heap->generation_alignment();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
848
a61af66fc99e Initial load
duke
parents:
diff changeset
849 MutableSpace* space_shrinking = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
850 if (from_space()->end() > to_space()->end()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
851 space_shrinking = from_space();
a61af66fc99e Initial load
duke
parents:
diff changeset
852 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
853 space_shrinking = to_space();
a61af66fc99e Initial load
duke
parents:
diff changeset
854 }
a61af66fc99e Initial load
duke
parents:
diff changeset
855
a61af66fc99e Initial load
duke
parents:
diff changeset
856 // Include any space that is committed but not included in
a61af66fc99e Initial load
duke
parents:
diff changeset
857 // the survivor spaces.
a61af66fc99e Initial load
duke
parents:
diff changeset
858 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
859 "Survivor space beyond high end");
a61af66fc99e Initial load
duke
parents:
diff changeset
860 size_t unused_committed = pointer_delta(virtual_space()->high(),
a61af66fc99e Initial load
duke
parents:
diff changeset
861 space_shrinking->end(), sizeof(char));
a61af66fc99e Initial load
duke
parents:
diff changeset
862
a61af66fc99e Initial load
duke
parents:
diff changeset
863 if (space_shrinking->is_empty()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
864 // Don't let the space shrink to 0
a61af66fc99e Initial load
duke
parents:
diff changeset
865 assert(space_shrinking->capacity_in_bytes() >= space_alignment,
a61af66fc99e Initial load
duke
parents:
diff changeset
866 "Space is too small");
a61af66fc99e Initial load
duke
parents:
diff changeset
867 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment;
a61af66fc99e Initial load
duke
parents:
diff changeset
868 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
869 delta_in_survivor = pointer_delta(space_shrinking->end(),
a61af66fc99e Initial load
duke
parents:
diff changeset
870 space_shrinking->top(),
a61af66fc99e Initial load
duke
parents:
diff changeset
871 sizeof(char));
a61af66fc99e Initial load
duke
parents:
diff changeset
872 }
a61af66fc99e Initial load
duke
parents:
diff changeset
873
a61af66fc99e Initial load
duke
parents:
diff changeset
874 size_t delta_in_bytes = unused_committed + delta_in_survivor;
a61af66fc99e Initial load
duke
parents:
diff changeset
875 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment);
a61af66fc99e Initial load
duke
parents:
diff changeset
876 return delta_in_bytes;
a61af66fc99e Initial load
duke
parents:
diff changeset
877 }
a61af66fc99e Initial load
duke
parents:
diff changeset
878
a61af66fc99e Initial load
duke
parents:
diff changeset
879 // Return the number of bytes available for resizing down the young
a61af66fc99e Initial load
duke
parents:
diff changeset
880 // generation. This is the minimum of
a61af66fc99e Initial load
duke
parents:
diff changeset
881 // input "bytes"
a61af66fc99e Initial load
duke
parents:
diff changeset
882 // bytes to the minimum young gen size
a61af66fc99e Initial load
duke
parents:
diff changeset
883 // bytes to the size currently being used + some small extra
a61af66fc99e Initial load
duke
parents:
diff changeset
884 size_t PSYoungGen::limit_gen_shrink(size_t bytes) {
a61af66fc99e Initial load
duke
parents:
diff changeset
885 // Allow shrinkage into the current eden but keep eden large enough
a61af66fc99e Initial load
duke
parents:
diff changeset
886 // to maintain the minimum young gen size
a61af66fc99e Initial load
duke
parents:
diff changeset
887 bytes = MIN3(bytes, available_to_min_gen(), available_to_live());
a61af66fc99e Initial load
duke
parents:
diff changeset
888 return align_size_down(bytes, virtual_space()->alignment());
a61af66fc99e Initial load
duke
parents:
diff changeset
889 }
a61af66fc99e Initial load
duke
parents:
diff changeset
890
a61af66fc99e Initial load
duke
parents:
diff changeset
891 void PSYoungGen::reset_after_change() {
a61af66fc99e Initial load
duke
parents:
diff changeset
892 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
893 }
a61af66fc99e Initial load
duke
parents:
diff changeset
894
a61af66fc99e Initial load
duke
parents:
diff changeset
895 void PSYoungGen::reset_survivors_after_shrink() {
a61af66fc99e Initial load
duke
parents:
diff changeset
896 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(),
a61af66fc99e Initial load
duke
parents:
diff changeset
897 (HeapWord*)virtual_space()->high_boundary());
a61af66fc99e Initial load
duke
parents:
diff changeset
898 PSScavenge::reference_processor()->set_span(_reserved);
a61af66fc99e Initial load
duke
parents:
diff changeset
899
a61af66fc99e Initial load
duke
parents:
diff changeset
900 MutableSpace* space_shrinking = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
901 if (from_space()->end() > to_space()->end()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
902 space_shrinking = from_space();
a61af66fc99e Initial load
duke
parents:
diff changeset
903 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
904 space_shrinking = to_space();
a61af66fc99e Initial load
duke
parents:
diff changeset
905 }
a61af66fc99e Initial load
duke
parents:
diff changeset
906
a61af66fc99e Initial load
duke
parents:
diff changeset
907 HeapWord* new_end = (HeapWord*)virtual_space()->high();
a61af66fc99e Initial load
duke
parents:
diff changeset
908 assert(new_end >= space_shrinking->bottom(), "Shrink was too large");
a61af66fc99e Initial load
duke
parents:
diff changeset
909 // Was there a shrink of the survivor space?
a61af66fc99e Initial load
duke
parents:
diff changeset
910 if (new_end < space_shrinking->end()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
911 MemRegion mr(space_shrinking->bottom(), new_end);
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
912 space_shrinking->initialize(mr,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
913 SpaceDecorator::DontClear,
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
914 SpaceDecorator::Mangle);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
915 }
a61af66fc99e Initial load
duke
parents:
diff changeset
916 }
a61af66fc99e Initial load
duke
parents:
diff changeset
917
a61af66fc99e Initial load
duke
parents:
diff changeset
918 // This method currently does not expect to expand into eden (i.e.,
a61af66fc99e Initial load
duke
parents:
diff changeset
919 // the virtual space boundaries is expected to be consistent
a61af66fc99e Initial load
duke
parents:
diff changeset
920 // with the eden boundaries..
a61af66fc99e Initial load
duke
parents:
diff changeset
921 void PSYoungGen::post_resize() {
a61af66fc99e Initial load
duke
parents:
diff changeset
922 assert_locked_or_safepoint(Heap_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
923 assert((eden_space()->bottom() < to_space()->bottom()) &&
a61af66fc99e Initial load
duke
parents:
diff changeset
924 (eden_space()->bottom() < from_space()->bottom()),
a61af66fc99e Initial load
duke
parents:
diff changeset
925 "Eden is assumed to be below the survivor spaces");
a61af66fc99e Initial load
duke
parents:
diff changeset
926
a61af66fc99e Initial load
duke
parents:
diff changeset
927 MemRegion cmr((HeapWord*)virtual_space()->low(),
a61af66fc99e Initial load
duke
parents:
diff changeset
928 (HeapWord*)virtual_space()->high());
a61af66fc99e Initial load
duke
parents:
diff changeset
929 Universe::heap()->barrier_set()->resize_covered_region(cmr);
a61af66fc99e Initial load
duke
parents:
diff changeset
930 space_invariants();
a61af66fc99e Initial load
duke
parents:
diff changeset
931 }
a61af66fc99e Initial load
duke
parents:
diff changeset
932
a61af66fc99e Initial load
duke
parents:
diff changeset
933
a61af66fc99e Initial load
duke
parents:
diff changeset
934
a61af66fc99e Initial load
duke
parents:
diff changeset
935 void PSYoungGen::update_counters() {
a61af66fc99e Initial load
duke
parents:
diff changeset
936 if (UsePerfData) {
a61af66fc99e Initial load
duke
parents:
diff changeset
937 _eden_counters->update_all();
a61af66fc99e Initial load
duke
parents:
diff changeset
938 _from_counters->update_all();
a61af66fc99e Initial load
duke
parents:
diff changeset
939 _to_counters->update_all();
a61af66fc99e Initial load
duke
parents:
diff changeset
940 _gen_counters->update_all();
a61af66fc99e Initial load
duke
parents:
diff changeset
941 }
a61af66fc99e Initial load
duke
parents:
diff changeset
942 }
a61af66fc99e Initial load
duke
parents:
diff changeset
943
6008
b632e80fc9dc 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 3251
diff changeset
944 void PSYoungGen::verify() {
b632e80fc9dc 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 3251
diff changeset
945 eden_space()->verify();
b632e80fc9dc 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 3251
diff changeset
946 from_space()->verify();
b632e80fc9dc 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 3251
diff changeset
947 to_space()->verify();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
948 }
263
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 13
diff changeset
949
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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950 #ifndef PRODUCT
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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951 void PSYoungGen::record_spaces_top() {
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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952 assert(ZapUnusedHeapArea, "Not mangling unused space");
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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953 eden_space()->set_top_for_allocations();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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954 from_space()->set_top_for_allocations();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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955 to_space()->set_top_for_allocations();
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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956 }
12eea04c8b06 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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957 #endif