annotate src/share/vm/memory/collectorPolicy.cpp @ 13057:4288e54fd145

8026851: Remove unnecessary code in GenRemSet Summary: Removed the GenRemSet::rem_set_name() since we only have one remset. Reviewed-by: stefank, mgerdin, tschatzl
author jwilhelm
date Mon, 21 Oct 2013 18:51:37 +0200
parents 85c1ca43713f
children 3aee6bc29547
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1 /*
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2 * Copyright (c) 2001, 2013, 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/shared/adaptiveSizePolicy.hpp"
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27 #include "gc_implementation/shared/gcPolicyCounters.hpp"
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28 #include "gc_implementation/shared/vmGCOperations.hpp"
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29 #include "memory/cardTableRS.hpp"
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30 #include "memory/collectorPolicy.hpp"
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31 #include "memory/gcLocker.inline.hpp"
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32 #include "memory/genCollectedHeap.hpp"
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33 #include "memory/generationSpec.hpp"
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34 #include "memory/space.hpp"
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35 #include "memory/universe.hpp"
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36 #include "runtime/arguments.hpp"
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37 #include "runtime/globals_extension.hpp"
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38 #include "runtime/handles.inline.hpp"
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39 #include "runtime/java.hpp"
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40 #include "runtime/thread.inline.hpp"
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41 #include "runtime/vmThread.hpp"
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42 #include "utilities/macros.hpp"
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43 #if INCLUDE_ALL_GCS
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44 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp"
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45 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp"
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46 #endif // INCLUDE_ALL_GCS
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47
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48 // CollectorPolicy methods.
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49
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50 void CollectorPolicy::initialize_flags() {
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51 assert(_max_alignment >= _min_alignment,
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52 err_msg("max_alignment: " SIZE_FORMAT " less than min_alignment: " SIZE_FORMAT,
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53 _max_alignment, _min_alignment));
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54 assert(_max_alignment % _min_alignment == 0,
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55 err_msg("max_alignment: " SIZE_FORMAT " not aligned by min_alignment: " SIZE_FORMAT,
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56 _max_alignment, _min_alignment));
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57
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58 if (MaxHeapSize < InitialHeapSize) {
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59 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified");
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60 }
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61
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62 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, _min_alignment);
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63 }
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64
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65 void CollectorPolicy::initialize_size_info() {
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66 // User inputs from -mx and ms must be aligned
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67 _min_heap_byte_size = align_size_up(Arguments::min_heap_size(), _min_alignment);
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68 _initial_heap_byte_size = align_size_up(InitialHeapSize, _min_alignment);
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69 _max_heap_byte_size = align_size_up(MaxHeapSize, _max_alignment);
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70
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71 // Check heap parameter properties
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72 if (_initial_heap_byte_size < M) {
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73 vm_exit_during_initialization("Too small initial heap");
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74 }
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75 // Check heap parameter properties
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76 if (_min_heap_byte_size < M) {
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77 vm_exit_during_initialization("Too small minimum heap");
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78 }
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79 if (_initial_heap_byte_size <= NewSize) {
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80 // make sure there is at least some room in old space
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81 vm_exit_during_initialization("Too small initial heap for new size specified");
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82 }
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83 if (_max_heap_byte_size < _min_heap_byte_size) {
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84 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified");
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85 }
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86 if (_initial_heap_byte_size < _min_heap_byte_size) {
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87 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified");
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88 }
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89 if (_max_heap_byte_size < _initial_heap_byte_size) {
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90 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified");
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91 }
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92
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93 if (PrintGCDetails && Verbose) {
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94 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap "
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95 SIZE_FORMAT " Maximum heap " SIZE_FORMAT,
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96 _min_heap_byte_size, _initial_heap_byte_size, _max_heap_byte_size);
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97 }
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98 }
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99
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100 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) {
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101 bool result = _should_clear_all_soft_refs;
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102 set_should_clear_all_soft_refs(false);
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103 return result;
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104 }
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105
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106 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap,
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107 int max_covered_regions) {
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108 return new CardTableRS(whole_heap, max_covered_regions);
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109 }
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110
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111 void CollectorPolicy::cleared_all_soft_refs() {
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112 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may
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113 // have been cleared in the last collection but if the gc overhear
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114 // limit continues to be near, SoftRefs should still be cleared.
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115 if (size_policy() != NULL) {
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116 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near();
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117 }
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118 _all_soft_refs_clear = true;
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119 }
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120
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121 size_t CollectorPolicy::compute_max_alignment() {
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122 // The card marking array and the offset arrays for old generations are
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123 // committed in os pages as well. Make sure they are entirely full (to
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124 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1
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125 // byte entry and the os page size is 4096, the maximum heap size should
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126 // be 512*4096 = 2MB aligned.
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127
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128 // There is only the GenRemSet in Hotspot and only the GenRemSet::CardTable
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129 // is supported.
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130 // Requirements of any new remembered set implementations must be added here.
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131 size_t alignment = GenRemSet::max_alignment_constraint(GenRemSet::CardTable);
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132
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133 // Parallel GC does its own alignment of the generations to avoid requiring a
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134 // large page (256M on some platforms) for the permanent generation. The
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135 // other collectors should also be updated to do their own alignment and then
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136 // this use of lcm() should be removed.
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137 if (UseLargePages && !UseParallelGC) {
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138 // in presence of large pages we have to make sure that our
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139 // alignment is large page aware
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140 alignment = lcm(os::large_page_size(), alignment);
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141 }
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142
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143 return alignment;
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144 }
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145
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146 // GenCollectorPolicy methods.
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147
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148 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) {
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149 size_t x = base_size / (NewRatio+1);
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150 size_t new_gen_size = x > _min_alignment ?
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151 align_size_down(x, _min_alignment) :
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152 _min_alignment;
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153 return new_gen_size;
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154 }
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155
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156 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size,
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157 size_t maximum_size) {
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158 size_t alignment = _min_alignment;
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159 size_t max_minus = maximum_size - alignment;
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160 return desired_size < max_minus ? desired_size : max_minus;
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161 }
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162
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163
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164 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size,
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165 size_t init_promo_size,
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166 size_t init_survivor_size) {
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167 const double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0;
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168 _size_policy = new AdaptiveSizePolicy(init_eden_size,
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169 init_promo_size,
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170 init_survivor_size,
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171 max_gc_pause_sec,
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172 GCTimeRatio);
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173 }
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174
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175 void GenCollectorPolicy::initialize_flags() {
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176 // All sizes must be multiples of the generation granularity.
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177 _min_alignment = (uintx) Generation::GenGrain;
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178 _max_alignment = compute_max_alignment();
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179
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180 CollectorPolicy::initialize_flags();
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181
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182 // All generational heaps have a youngest gen; handle those flags here.
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183
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184 // Adjust max size parameters
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185 if (NewSize > MaxNewSize) {
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186 MaxNewSize = NewSize;
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187 }
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188 NewSize = align_size_down(NewSize, _min_alignment);
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189 MaxNewSize = align_size_down(MaxNewSize, _min_alignment);
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190
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191 // Check validity of heap flags
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192 assert(NewSize % _min_alignment == 0, "eden space alignment");
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193 assert(MaxNewSize % _min_alignment == 0, "survivor space alignment");
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194
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195 if (NewSize < 3 * _min_alignment) {
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196 // make sure there room for eden and two survivor spaces
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197 vm_exit_during_initialization("Too small new size specified");
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198 }
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199 if (SurvivorRatio < 1 || NewRatio < 1) {
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200 vm_exit_during_initialization("Invalid young gen ratio specified");
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201 }
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202 }
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203
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204 void TwoGenerationCollectorPolicy::initialize_flags() {
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205 GenCollectorPolicy::initialize_flags();
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206
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207 OldSize = align_size_down(OldSize, _min_alignment);
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208
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209 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) {
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210 // NewRatio will be used later to set the young generation size so we use
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211 // it to calculate how big the heap should be based on the requested OldSize
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212 // and NewRatio.
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213 assert(NewRatio > 0, "NewRatio should have been set up earlier");
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214 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1);
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215
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216 calculated_heapsize = align_size_up(calculated_heapsize, _max_alignment);
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217 MaxHeapSize = calculated_heapsize;
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218 InitialHeapSize = calculated_heapsize;
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219 }
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220 MaxHeapSize = align_size_up(MaxHeapSize, _max_alignment);
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221
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222 // adjust max heap size if necessary
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223 if (NewSize + OldSize > MaxHeapSize) {
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224 if (FLAG_IS_CMDLINE(MaxHeapSize)) {
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225 // somebody set a maximum heap size with the intention that we should not
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226 // exceed it. Adjust New/OldSize as necessary.
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227 uintx calculated_size = NewSize + OldSize;
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228 double shrink_factor = (double) MaxHeapSize / calculated_size;
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229 // align
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230 NewSize = align_size_down((uintx) (NewSize * shrink_factor), _min_alignment);
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231 // OldSize is already aligned because above we aligned MaxHeapSize to
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232 // _max_alignment, and we just made sure that NewSize is aligned to
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233 // _min_alignment. In initialize_flags() we verified that _max_alignment
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234 // is a multiple of _min_alignment.
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235 OldSize = MaxHeapSize - NewSize;
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236 } else {
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237 MaxHeapSize = NewSize + OldSize;
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238 }
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239 }
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240 // need to do this again
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241 MaxHeapSize = align_size_up(MaxHeapSize, _max_alignment);
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242
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243 // adjust max heap size if necessary
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244 if (NewSize + OldSize > MaxHeapSize) {
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245 if (FLAG_IS_CMDLINE(MaxHeapSize)) {
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246 // somebody set a maximum heap size with the intention that we should not
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247 // exceed it. Adjust New/OldSize as necessary.
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248 uintx calculated_size = NewSize + OldSize;
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249 double shrink_factor = (double) MaxHeapSize / calculated_size;
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250 // align
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251 NewSize = align_size_down((uintx) (NewSize * shrink_factor), _min_alignment);
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252 // OldSize is already aligned because above we aligned MaxHeapSize to
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253 // _max_alignment, and we just made sure that NewSize is aligned to
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254 // _min_alignment. In initialize_flags() we verified that _max_alignment
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255 // is a multiple of _min_alignment.
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256 OldSize = MaxHeapSize - NewSize;
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257 } else {
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258 MaxHeapSize = NewSize + OldSize;
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259 }
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260 }
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261 // need to do this again
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262 MaxHeapSize = align_size_up(MaxHeapSize, _max_alignment);
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263
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264 always_do_update_barrier = UseConcMarkSweepGC;
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265
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266 // Check validity of heap flags
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267 assert(OldSize % _min_alignment == 0, "old space alignment");
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268 assert(MaxHeapSize % _max_alignment == 0, "maximum heap alignment");
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269 }
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270
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271 // Values set on the command line win over any ergonomically
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272 // set command line parameters.
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273 // Ergonomic choice of parameters are done before this
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274 // method is called. Values for command line parameters such as NewSize
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275 // and MaxNewSize feed those ergonomic choices into this method.
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276 // This method makes the final generation sizings consistent with
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277 // themselves and with overall heap sizings.
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278 // In the absence of explicitly set command line flags, policies
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279 // such as the use of NewRatio are used to size the generation.
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280 void GenCollectorPolicy::initialize_size_info() {
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281 CollectorPolicy::initialize_size_info();
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282
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283 // _min_alignment is used for alignment within a generation.
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284 // There is additional alignment done down stream for some
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285 // collectors that sometimes causes unwanted rounding up of
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286 // generations sizes.
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287
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288 // Determine maximum size of gen0
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289
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290 size_t max_new_size = 0;
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291 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) {
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292 if (MaxNewSize < _min_alignment) {
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293 max_new_size = _min_alignment;
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294 }
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295 if (MaxNewSize >= _max_heap_byte_size) {
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296 max_new_size = align_size_down(_max_heap_byte_size - _min_alignment,
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297 _min_alignment);
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298 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or "
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299 "greater than the entire heap (" SIZE_FORMAT "k). A "
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300 "new generation size of " SIZE_FORMAT "k will be used.",
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301 MaxNewSize/K, _max_heap_byte_size/K, max_new_size/K);
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302 } else {
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303 max_new_size = align_size_down(MaxNewSize, _min_alignment);
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304 }
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305
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306 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated
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307 // specially at this point to just use an ergonomically set
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308 // MaxNewSize to set max_new_size. For cases with small
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309 // heaps such a policy often did not work because the MaxNewSize
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310 // was larger than the entire heap. The interpretation given
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311 // to ergonomically set flags is that the flags are set
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312 // by different collectors for their own special needs but
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313 // are not allowed to badly shape the heap. This allows the
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314 // different collectors to decide what's best for themselves
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315 // without having to factor in the overall heap shape. It
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316 // can be the case in the future that the collectors would
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317 // only make "wise" ergonomics choices and this policy could
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318 // just accept those choices. The choices currently made are
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319 // not always "wise".
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320 } else {
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321 max_new_size = scale_by_NewRatio_aligned(_max_heap_byte_size);
13
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322 // Bound the maximum size by NewSize below (since it historically
0
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323 // would have been NewSize and because the NewRatio calculation could
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324 // yield a size that is too small) and bound it by MaxNewSize above.
13
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325 // Ergonomics plays here by previously calculating the desired
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326 // NewSize and MaxNewSize.
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327 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize);
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328 }
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329 assert(max_new_size > 0, "All paths should set max_new_size");
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330
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331 // Given the maximum gen0 size, determine the initial and
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332 // minimum gen0 sizes.
13
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333
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334 if (_max_heap_byte_size == _min_heap_byte_size) {
13
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335 // The maximum and minimum heap sizes are the same so
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336 // the generations minimum and initial must be the
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337 // same as its maximum.
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338 _min_gen0_size = max_new_size;
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339 _initial_gen0_size = max_new_size;
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340 _max_gen0_size = max_new_size;
13
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341 } else {
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342 size_t desired_new_size = 0;
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343 if (!FLAG_IS_DEFAULT(NewSize)) {
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344 // If NewSize is set ergonomically (for example by cms), it
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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345 // would make sense to use it. If it is used, also use it
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346 // to set the initial size. Although there is no reason
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347 // the minimum size and the initial size have to be the same,
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348 // the current implementation gets into trouble during the calculation
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349 // of the tenured generation sizes if they are different.
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350 // Note that this makes the initial size and the minimum size
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351 // generally small compared to the NewRatio calculation.
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352 _min_gen0_size = NewSize;
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353 desired_new_size = NewSize;
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354 max_new_size = MAX2(max_new_size, NewSize);
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355 } else {
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356 // For the case where NewSize is the default, use NewRatio
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357 // to size the minimum and initial generation sizes.
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358 // Use the default NewSize as the floor for these values. If
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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359 // NewRatio is overly large, the resulting sizes can be too
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360 // small.
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361 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(_min_heap_byte_size), NewSize);
13
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362 desired_new_size =
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363 MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize);
13
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364 }
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365
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366 assert(_min_gen0_size > 0, "Sanity check");
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367 _initial_gen0_size = desired_new_size;
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368 _max_gen0_size = max_new_size;
13
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diff changeset
369
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370 // At this point the desirable initial and minimum sizes have been
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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371 // determined without regard to the maximum sizes.
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jmasa
parents: 0
diff changeset
372
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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373 // Bound the sizes by the corresponding overall heap sizes.
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374 _min_gen0_size = bound_minus_alignment(_min_gen0_size, _min_heap_byte_size);
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375 _initial_gen0_size = bound_minus_alignment(_initial_gen0_size, _initial_heap_byte_size);
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376 _max_gen0_size = bound_minus_alignment(_max_gen0_size, _max_heap_byte_size);
13
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377
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378 // At this point all three sizes have been checked against the
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379 // maximum sizes but have not been checked for consistency
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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380 // among the three.
13
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381
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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382 // Final check min <= initial <= max
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383 _min_gen0_size = MIN2(_min_gen0_size, _max_gen0_size);
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384 _initial_gen0_size = MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size);
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385 _min_gen0_size = MIN2(_min_gen0_size, _initial_gen0_size);
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386 }
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387
13
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diff changeset
388 if (PrintGCDetails && Verbose) {
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diff changeset
389 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 "
13
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390 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
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391 _min_gen0_size, _initial_gen0_size, _max_gen0_size);
13
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diff changeset
392 }
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393 }
0
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394
13
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diff changeset
395 // Call this method during the sizing of the gen1 to make
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
396 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
397 // the most freedom in sizing because it is done before the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
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diff changeset
398 // policy for gen1 is applied. Once gen1 policies have been applied,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
399 // there may be conflicts in the shape of the heap and this method
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
400 // is used to make the needed adjustments. The application of the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
401 // policies could be more sophisticated (iterative for example) but
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
402 // keeping it simple also seems a worthwhile goal.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
403 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr,
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diff changeset
404 size_t* gen1_size_ptr,
8013
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diff changeset
405 const size_t heap_size,
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diff changeset
406 const size_t min_gen1_size) {
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
407 bool result = false;
8013
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diff changeset
408
13
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diff changeset
409 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) {
8013
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diff changeset
410 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) &&
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411 (heap_size >= min_gen1_size + _min_alignment)) {
8013
95ccff9eee8e 6348447: Specifying -XX:OldSize crashes 64-bit VMs
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diff changeset
412 // Adjust gen0 down to accommodate min_gen1_size
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diff changeset
413 *gen0_size_ptr = heap_size - min_gen1_size;
13
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diff changeset
414 *gen0_size_ptr =
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415 MAX2((uintx)align_size_down(*gen0_size_ptr, _min_alignment), _min_alignment);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
416 assert(*gen0_size_ptr > 0, "Min gen0 is too large");
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
417 result = true;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
418 } else {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
419 *gen1_size_ptr = heap_size - *gen0_size_ptr;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
420 *gen1_size_ptr =
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421 MAX2((uintx)align_size_down(*gen1_size_ptr, _min_alignment), _min_alignment);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
422 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
423 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
424 return result;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
425 }
0
a61af66fc99e Initial load
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diff changeset
426
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
427 // Minimum sizes of the generations may be different than
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
428 // the initial sizes. An inconsistently is permitted here
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
429 // in the total size that can be specified explicitly by
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
430 // command line specification of OldSize and NewSize and
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
431 // also a command line specification of -Xms. Issue a warning
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
432 // but allow the values to pass.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
433
a61af66fc99e Initial load
duke
parents:
diff changeset
434 void TwoGenerationCollectorPolicy::initialize_size_info() {
a61af66fc99e Initial load
duke
parents:
diff changeset
435 GenCollectorPolicy::initialize_size_info();
a61af66fc99e Initial load
duke
parents:
diff changeset
436
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
437 // At this point the minimum, initial and maximum sizes
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
438 // of the overall heap and of gen0 have been determined.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
439 // The maximum gen1 size can be determined from the maximum gen0
2368
dde920245681 6896099: Integrate CMS heap ergo with default heap sizing ergo
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parents: 1994
diff changeset
440 // and maximum heap size since no explicit flags exits
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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parents: 0
diff changeset
441 // for setting the gen1 maximum.
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442 _max_gen1_size = _max_heap_byte_size - _max_gen0_size;
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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diff changeset
443 _max_gen1_size =
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444 MAX2((uintx)align_size_down(_max_gen1_size, _min_alignment), _min_alignment);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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parents: 0
diff changeset
445 // If no explicit command line flag has been set for the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
446 // gen1 size, use what is left for gen1.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
447 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
448 // The user has not specified any value or ergonomics
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
449 // has chosen a value (which may or may not be consistent
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
450 // with the overall heap size). In either case make
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
451 // the minimum, maximum and initial sizes consistent
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
452 // with the gen0 sizes and the overall heap sizes.
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diff changeset
453 assert(_min_heap_byte_size > _min_gen0_size,
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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parents: 0
diff changeset
454 "gen0 has an unexpected minimum size");
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diff changeset
455 _min_gen1_size = _min_heap_byte_size - _min_gen0_size;
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diff changeset
456 _min_gen1_size =
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
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diff changeset
457 MAX2((uintx)align_size_down(_min_gen1_size, _min_alignment), _min_alignment);
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diff changeset
458 _initial_gen1_size = _initial_heap_byte_size - _initial_gen0_size;
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
459 _initial_gen1_size =
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
460 MAX2((uintx)align_size_down(_initial_gen1_size, _min_alignment), _min_alignment);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
461 } else {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
462 // It's been explicitly set on the command line. Use the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
463 // OldSize and then determine the consequences.
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
464 _min_gen1_size = OldSize;
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
465 _initial_gen1_size = OldSize;
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
466
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
467 // If the user has explicitly set an OldSize that is inconsistent
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
468 // with other command line flags, issue a warning.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
469 // The generation minimums and the overall heap mimimum should
a61af66fc99e Initial load
duke
parents:
diff changeset
470 // be within one heap alignment.
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
471 if ((_min_gen1_size + _min_gen0_size + _min_alignment) < _min_heap_byte_size) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
472 warning("Inconsistency between minimum heap size and minimum "
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
473 "generation sizes: using minimum heap = " SIZE_FORMAT,
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
474 _min_heap_byte_size);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
475 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
476 if ((OldSize > _max_gen1_size)) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
477 warning("Inconsistency between maximum heap size and maximum "
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
478 "generation sizes: using maximum heap = " SIZE_FORMAT
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
479 " -XX:OldSize flag is being ignored",
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
480 _max_heap_byte_size);
2368
dde920245681 6896099: Integrate CMS heap ergo with default heap sizing ergo
ysr
parents: 1994
diff changeset
481 }
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
482 // If there is an inconsistency between the OldSize and the minimum and/or
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
483 // initial size of gen0, since OldSize was explicitly set, OldSize wins.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
484 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size,
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
485 _min_heap_byte_size, OldSize)) {
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
486 if (PrintGCDetails && Verbose) {
2368
dde920245681 6896099: Integrate CMS heap ergo with default heap sizing ergo
ysr
parents: 1994
diff changeset
487 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 "
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
488 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
489 _min_gen0_size, _initial_gen0_size, _max_gen0_size);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
490 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
491 }
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
492 // Initial size
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
493 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size,
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
494 _initial_heap_byte_size, OldSize)) {
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
495 if (PrintGCDetails && Verbose) {
2368
dde920245681 6896099: Integrate CMS heap ergo with default heap sizing ergo
ysr
parents: 1994
diff changeset
496 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 "
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
497 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
498 _min_gen0_size, _initial_gen0_size, _max_gen0_size);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
499 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
500 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
501 }
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
502 // Enforce the maximum gen1 size.
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
503 _min_gen1_size = MIN2(_min_gen1_size, _max_gen1_size);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
504
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
505 // Check that min gen1 <= initial gen1 <= max gen1
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
506 _initial_gen1_size = MAX2(_initial_gen1_size, _min_gen1_size);
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
507 _initial_gen1_size = MIN2(_initial_gen1_size, _max_gen1_size);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
508
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
509 if (PrintGCDetails && Verbose) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
510 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 "
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
511 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT,
12830
9b4d0569f2f4 8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents: 12350
diff changeset
512 _min_gen1_size, _initial_gen1_size, _max_gen1_size);
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
513 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
514 }
a61af66fc99e Initial load
duke
parents:
diff changeset
515
a61af66fc99e Initial load
duke
parents:
diff changeset
516 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size,
a61af66fc99e Initial load
duke
parents:
diff changeset
517 bool is_tlab,
a61af66fc99e Initial load
duke
parents:
diff changeset
518 bool* gc_overhead_limit_was_exceeded) {
a61af66fc99e Initial load
duke
parents:
diff changeset
519 GenCollectedHeap *gch = GenCollectedHeap::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
520
a61af66fc99e Initial load
duke
parents:
diff changeset
521 debug_only(gch->check_for_valid_allocation_state());
a61af66fc99e Initial load
duke
parents:
diff changeset
522 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed");
1387
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
523
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
524 // In general gc_overhead_limit_was_exceeded should be false so
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
525 // set it so here and reset it to true only if the gc time
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
526 // limit is being exceeded as checked below.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
527 *gc_overhead_limit_was_exceeded = false;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
528
0
a61af66fc99e Initial load
duke
parents:
diff changeset
529 HeapWord* result = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
530
a61af66fc99e Initial load
duke
parents:
diff changeset
531 // Loop until the allocation is satisified,
a61af66fc99e Initial load
duke
parents:
diff changeset
532 // or unsatisfied after GC.
8853
2e093b564241 7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents: 8743
diff changeset
533 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
534 HandleMark hm; // discard any handles allocated in each iteration
a61af66fc99e Initial load
duke
parents:
diff changeset
535
a61af66fc99e Initial load
duke
parents:
diff changeset
536 // First allocation attempt is lock-free.
a61af66fc99e Initial load
duke
parents:
diff changeset
537 Generation *gen0 = gch->get_gen(0);
a61af66fc99e Initial load
duke
parents:
diff changeset
538 assert(gen0->supports_inline_contig_alloc(),
a61af66fc99e Initial load
duke
parents:
diff changeset
539 "Otherwise, must do alloc within heap lock");
a61af66fc99e Initial load
duke
parents:
diff changeset
540 if (gen0->should_allocate(size, is_tlab)) {
a61af66fc99e Initial load
duke
parents:
diff changeset
541 result = gen0->par_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
542 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
543 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
544 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
545 }
a61af66fc99e Initial load
duke
parents:
diff changeset
546 }
a61af66fc99e Initial load
duke
parents:
diff changeset
547 unsigned int gc_count_before; // read inside the Heap_lock locked region
a61af66fc99e Initial load
duke
parents:
diff changeset
548 {
a61af66fc99e Initial load
duke
parents:
diff changeset
549 MutexLocker ml(Heap_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
550 if (PrintGC && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
551 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:"
a61af66fc99e Initial load
duke
parents:
diff changeset
552 " attempting locked slow path allocation");
a61af66fc99e Initial load
duke
parents:
diff changeset
553 }
a61af66fc99e Initial load
duke
parents:
diff changeset
554 // Note that only large objects get a shot at being
a61af66fc99e Initial load
duke
parents:
diff changeset
555 // allocated in later generations.
a61af66fc99e Initial load
duke
parents:
diff changeset
556 bool first_only = ! should_try_older_generation_allocation(size);
a61af66fc99e Initial load
duke
parents:
diff changeset
557
a61af66fc99e Initial load
duke
parents:
diff changeset
558 result = gch->attempt_allocation(size, is_tlab, first_only);
a61af66fc99e Initial load
duke
parents:
diff changeset
559 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
560 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
561 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
562 }
a61af66fc99e Initial load
duke
parents:
diff changeset
563
a61af66fc99e Initial load
duke
parents:
diff changeset
564 if (GC_locker::is_active_and_needs_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
565 if (is_tlab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
566 return NULL; // Caller will retry allocating individual object
a61af66fc99e Initial load
duke
parents:
diff changeset
567 }
a61af66fc99e Initial load
duke
parents:
diff changeset
568 if (!gch->is_maximal_no_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
569 // Try and expand heap to satisfy request
a61af66fc99e Initial load
duke
parents:
diff changeset
570 result = expand_heap_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
571 // result could be null if we are out of space
a61af66fc99e Initial load
duke
parents:
diff changeset
572 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
573 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
574 }
a61af66fc99e Initial load
duke
parents:
diff changeset
575 }
a61af66fc99e Initial load
duke
parents:
diff changeset
576
8853
2e093b564241 7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents: 8743
diff changeset
577 if (gclocker_stalled_count > GCLockerRetryAllocationCount) {
2e093b564241 7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents: 8743
diff changeset
578 return NULL; // we didn't get to do a GC and we didn't get any memory
2e093b564241 7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents: 8743
diff changeset
579 }
2e093b564241 7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents: 8743
diff changeset
580
0
a61af66fc99e Initial load
duke
parents:
diff changeset
581 // If this thread is not in a jni critical section, we stall
a61af66fc99e Initial load
duke
parents:
diff changeset
582 // the requestor until the critical section has cleared and
a61af66fc99e Initial load
duke
parents:
diff changeset
583 // GC allowed. When the critical section clears, a GC is
a61af66fc99e Initial load
duke
parents:
diff changeset
584 // initiated by the last thread exiting the critical section; so
a61af66fc99e Initial load
duke
parents:
diff changeset
585 // we retry the allocation sequence from the beginning of the loop,
a61af66fc99e Initial load
duke
parents:
diff changeset
586 // rather than causing more, now probably unnecessary, GC attempts.
a61af66fc99e Initial load
duke
parents:
diff changeset
587 JavaThread* jthr = JavaThread::current();
a61af66fc99e Initial load
duke
parents:
diff changeset
588 if (!jthr->in_critical()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
589 MutexUnlocker mul(Heap_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
590 // Wait for JNI critical section to be exited
a61af66fc99e Initial load
duke
parents:
diff changeset
591 GC_locker::stall_until_clear();
8853
2e093b564241 7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents: 8743
diff changeset
592 gclocker_stalled_count += 1;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
593 continue;
a61af66fc99e Initial load
duke
parents:
diff changeset
594 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
595 if (CheckJNICalls) {
a61af66fc99e Initial load
duke
parents:
diff changeset
596 fatal("Possible deadlock due to allocating while"
a61af66fc99e Initial load
duke
parents:
diff changeset
597 " in jni critical section");
a61af66fc99e Initial load
duke
parents:
diff changeset
598 }
a61af66fc99e Initial load
duke
parents:
diff changeset
599 return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
600 }
a61af66fc99e Initial load
duke
parents:
diff changeset
601 }
a61af66fc99e Initial load
duke
parents:
diff changeset
602
a61af66fc99e Initial load
duke
parents:
diff changeset
603 // Read the gc count while the heap lock is held.
a61af66fc99e Initial load
duke
parents:
diff changeset
604 gc_count_before = Universe::heap()->total_collections();
a61af66fc99e Initial load
duke
parents:
diff changeset
605 }
a61af66fc99e Initial load
duke
parents:
diff changeset
606
a61af66fc99e Initial load
duke
parents:
diff changeset
607 VM_GenCollectForAllocation op(size,
a61af66fc99e Initial load
duke
parents:
diff changeset
608 is_tlab,
a61af66fc99e Initial load
duke
parents:
diff changeset
609 gc_count_before);
a61af66fc99e Initial load
duke
parents:
diff changeset
610 VMThread::execute(&op);
a61af66fc99e Initial load
duke
parents:
diff changeset
611 if (op.prologue_succeeded()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
612 result = op.result();
a61af66fc99e Initial load
duke
parents:
diff changeset
613 if (op.gc_locked()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
614 assert(result == NULL, "must be NULL if gc_locked() is true");
a61af66fc99e Initial load
duke
parents:
diff changeset
615 continue; // retry and/or stall as necessary
a61af66fc99e Initial load
duke
parents:
diff changeset
616 }
1387
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
617
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
618 // Allocation has failed and a collection
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
619 // has been done. If the gc time limit was exceeded the
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
620 // this time, return NULL so that an out-of-memory
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
621 // will be thrown. Clear gc_overhead_limit_exceeded
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
622 // so that the overhead exceeded does not persist.
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
623
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
624 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
625 const bool softrefs_clear = all_soft_refs_clear();
8743
82657b6a8cc0 6976528: PS: assert(!limit_exceeded || softrefs_clear) failed: Should have been cleared
jmasa
parents: 8072
diff changeset
626
1387
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
627 if (limit_exceeded && softrefs_clear) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
628 *gc_overhead_limit_was_exceeded = true;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
629 size_policy()->set_gc_overhead_limit_exceeded(false);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
630 if (op.result() != NULL) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
631 CollectedHeap::fill_with_object(op.result(), size);
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
632 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
633 return NULL;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
634 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
635 assert(result == NULL || gch->is_in_reserved(result),
a61af66fc99e Initial load
duke
parents:
diff changeset
636 "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
637 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
638 }
a61af66fc99e Initial load
duke
parents:
diff changeset
639
a61af66fc99e Initial load
duke
parents:
diff changeset
640 // Give a warning if we seem to be looping forever.
a61af66fc99e Initial load
duke
parents:
diff changeset
641 if ((QueuedAllocationWarningCount > 0) &&
a61af66fc99e Initial load
duke
parents:
diff changeset
642 (try_count % QueuedAllocationWarningCount == 0)) {
a61af66fc99e Initial load
duke
parents:
diff changeset
643 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t"
a61af66fc99e Initial load
duke
parents:
diff changeset
644 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : "");
a61af66fc99e Initial load
duke
parents:
diff changeset
645 }
a61af66fc99e Initial load
duke
parents:
diff changeset
646 }
a61af66fc99e Initial load
duke
parents:
diff changeset
647 }
a61af66fc99e Initial load
duke
parents:
diff changeset
648
a61af66fc99e Initial load
duke
parents:
diff changeset
649 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size,
a61af66fc99e Initial load
duke
parents:
diff changeset
650 bool is_tlab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
651 GenCollectedHeap *gch = GenCollectedHeap::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
652 HeapWord* result = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
653 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) {
a61af66fc99e Initial load
duke
parents:
diff changeset
654 Generation *gen = gch->get_gen(i);
a61af66fc99e Initial load
duke
parents:
diff changeset
655 if (gen->should_allocate(size, is_tlab)) {
a61af66fc99e Initial load
duke
parents:
diff changeset
656 result = gen->expand_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
657 }
a61af66fc99e Initial load
duke
parents:
diff changeset
658 }
a61af66fc99e Initial load
duke
parents:
diff changeset
659 assert(result == NULL || gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
660 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
661 }
a61af66fc99e Initial load
duke
parents:
diff changeset
662
a61af66fc99e Initial load
duke
parents:
diff changeset
663 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size,
a61af66fc99e Initial load
duke
parents:
diff changeset
664 bool is_tlab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
665 GenCollectedHeap *gch = GenCollectedHeap::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
666 GCCauseSetter x(gch, GCCause::_allocation_failure);
a61af66fc99e Initial load
duke
parents:
diff changeset
667 HeapWord* result = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
668
a61af66fc99e Initial load
duke
parents:
diff changeset
669 assert(size != 0, "Precondition violated");
a61af66fc99e Initial load
duke
parents:
diff changeset
670 if (GC_locker::is_active_and_needs_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
671 // GC locker is active; instead of a collection we will attempt
a61af66fc99e Initial load
duke
parents:
diff changeset
672 // to expand the heap, if there's room for expansion.
a61af66fc99e Initial load
duke
parents:
diff changeset
673 if (!gch->is_maximal_no_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
674 result = expand_heap_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
675 }
a61af66fc99e Initial load
duke
parents:
diff changeset
676 return result; // could be null if we are out of space
1994
6cd6d394f280 7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents: 1972
diff changeset
677 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
678 // Do an incremental collection.
a61af66fc99e Initial load
duke
parents:
diff changeset
679 gch->do_collection(false /* full */,
a61af66fc99e Initial load
duke
parents:
diff changeset
680 false /* clear_all_soft_refs */,
a61af66fc99e Initial load
duke
parents:
diff changeset
681 size /* size */,
a61af66fc99e Initial load
duke
parents:
diff changeset
682 is_tlab /* is_tlab */,
a61af66fc99e Initial load
duke
parents:
diff changeset
683 number_of_generations() - 1 /* max_level */);
a61af66fc99e Initial load
duke
parents:
diff changeset
684 } else {
1994
6cd6d394f280 7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents: 1972
diff changeset
685 if (Verbose && PrintGCDetails) {
6cd6d394f280 7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents: 1972
diff changeset
686 gclog_or_tty->print(" :: Trying full because partial may fail :: ");
6cd6d394f280 7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents: 1972
diff changeset
687 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
688 // Try a full collection; see delta for bug id 6266275
a61af66fc99e Initial load
duke
parents:
diff changeset
689 // for the original code and why this has been simplified
a61af66fc99e Initial load
duke
parents:
diff changeset
690 // with from-space allocation criteria modified and
a61af66fc99e Initial load
duke
parents:
diff changeset
691 // such allocation moved out of the safepoint path.
a61af66fc99e Initial load
duke
parents:
diff changeset
692 gch->do_collection(true /* full */,
a61af66fc99e Initial load
duke
parents:
diff changeset
693 false /* clear_all_soft_refs */,
a61af66fc99e Initial load
duke
parents:
diff changeset
694 size /* size */,
a61af66fc99e Initial load
duke
parents:
diff changeset
695 is_tlab /* is_tlab */,
a61af66fc99e Initial load
duke
parents:
diff changeset
696 number_of_generations() - 1 /* max_level */);
a61af66fc99e Initial load
duke
parents:
diff changeset
697 }
a61af66fc99e Initial load
duke
parents:
diff changeset
698
a61af66fc99e Initial load
duke
parents:
diff changeset
699 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/);
a61af66fc99e Initial load
duke
parents:
diff changeset
700
a61af66fc99e Initial load
duke
parents:
diff changeset
701 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
702 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
703 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
704 }
a61af66fc99e Initial load
duke
parents:
diff changeset
705
a61af66fc99e Initial load
duke
parents:
diff changeset
706 // OK, collection failed, try expansion.
a61af66fc99e Initial load
duke
parents:
diff changeset
707 result = expand_heap_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
708 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
709 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
710 }
a61af66fc99e Initial load
duke
parents:
diff changeset
711
a61af66fc99e Initial load
duke
parents:
diff changeset
712 // If we reach this point, we're really out of memory. Try every trick
a61af66fc99e Initial load
duke
parents:
diff changeset
713 // we can to reclaim memory. Force collection of soft references. Force
a61af66fc99e Initial load
duke
parents:
diff changeset
714 // a complete compaction of the heap. Any additional methods for finding
a61af66fc99e Initial load
duke
parents:
diff changeset
715 // free memory should be here, especially if they are expensive. If this
a61af66fc99e Initial load
duke
parents:
diff changeset
716 // attempt fails, an OOM exception will be thrown.
a61af66fc99e Initial load
duke
parents:
diff changeset
717 {
10287
12f651e29f6b 6843347: Boundary values in some public GC options cause crashes
tschatzl
parents: 10284
diff changeset
718 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted
0
a61af66fc99e Initial load
duke
parents:
diff changeset
719
a61af66fc99e Initial load
duke
parents:
diff changeset
720 gch->do_collection(true /* full */,
a61af66fc99e Initial load
duke
parents:
diff changeset
721 true /* clear_all_soft_refs */,
a61af66fc99e Initial load
duke
parents:
diff changeset
722 size /* size */,
a61af66fc99e Initial load
duke
parents:
diff changeset
723 is_tlab /* is_tlab */,
a61af66fc99e Initial load
duke
parents:
diff changeset
724 number_of_generations() - 1 /* max_level */);
a61af66fc99e Initial load
duke
parents:
diff changeset
725 }
a61af66fc99e Initial load
duke
parents:
diff changeset
726
a61af66fc99e Initial load
duke
parents:
diff changeset
727 result = gch->attempt_allocation(size, is_tlab, false /* first_only */);
a61af66fc99e Initial load
duke
parents:
diff changeset
728 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
729 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
730 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
731 }
a61af66fc99e Initial load
duke
parents:
diff changeset
732
1387
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
733 assert(!should_clear_all_soft_refs(),
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
734 "Flag should have been handled and cleared prior to this point");
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
735
0
a61af66fc99e Initial load
duke
parents:
diff changeset
736 // What else? We might try synchronous finalization later. If the total
a61af66fc99e Initial load
duke
parents:
diff changeset
737 // space available is large enough for the allocation, then a more
a61af66fc99e Initial load
duke
parents:
diff changeset
738 // complete compaction phase than we've tried so far might be
a61af66fc99e Initial load
duke
parents:
diff changeset
739 // appropriate.
a61af66fc99e Initial load
duke
parents:
diff changeset
740 return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
741 }
a61af66fc99e Initial load
duke
parents:
diff changeset
742
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
743 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation(
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
744 ClassLoaderData* loader_data,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
745 size_t word_size,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
746 Metaspace::MetadataType mdtype) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
747 uint loop_count = 0;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
748 uint gc_count = 0;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
749 uint full_gc_count = 0;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
750
6923
3fadc0e8cffe 8000988: VM deadlock when running btree006 on windows-i586
jmasa
parents: 6753
diff changeset
751 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock");
3fadc0e8cffe 8000988: VM deadlock when running btree006 on windows-i586
jmasa
parents: 6753
diff changeset
752
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
753 do {
6753
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
754 MetaWord* result = NULL;
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
755 if (GC_locker::is_active_and_needs_gc()) {
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
756 // If the GC_locker is active, just expand and allocate.
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
757 // If that does not succeed, wait if this thread is not
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
758 // in a critical section itself.
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
759 result =
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
760 loader_data->metaspace_non_null()->expand_and_allocate(word_size,
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
761 mdtype);
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
762 if (result != NULL) {
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
763 return result;
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
764 }
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
765 JavaThread* jthr = JavaThread::current();
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
766 if (!jthr->in_critical()) {
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
767 // Wait for JNI critical section to be exited
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
768 GC_locker::stall_until_clear();
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
769 // The GC invoked by the last thread leaving the critical
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
770 // section will be a young collection and a full collection
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
771 // is (currently) needed for unloading classes so continue
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
772 // to the next iteration to get a full GC.
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
773 continue;
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
774 } else {
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
775 if (CheckJNICalls) {
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
776 fatal("Possible deadlock due to allocating while"
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
777 " in jni critical section");
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
778 }
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
779 return NULL;
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
780 }
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
781 }
8da5e203b993 7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents: 6725
diff changeset
782
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
783 { // Need lock to get self consistent gc_count's
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
784 MutexLocker ml(Heap_lock);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
785 gc_count = Universe::heap()->total_collections();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
786 full_gc_count = Universe::heap()->total_full_collections();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
787 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
788
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
789 // Generate a VM operation
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
790 VM_CollectForMetadataAllocation op(loader_data,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
791 word_size,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
792 mdtype,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
793 gc_count,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
794 full_gc_count,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
795 GCCause::_metadata_GC_threshold);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
796 VMThread::execute(&op);
7446
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
797
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
798 // If GC was locked out, try again. Check
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
799 // before checking success because the prologue
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
800 // could have succeeded and the GC still have
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
801 // been locked out.
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
802 if (op.gc_locked()) {
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
803 continue;
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
804 }
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents: 7180
diff changeset
805
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
806 if (op.prologue_succeeded()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
807 return op.result();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
808 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 3960
diff changeset
809 loop_count++;
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810 if ((QueuedAllocationWarningCount > 0) &&
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
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811 (loop_count % QueuedAllocationWarningCount == 0)) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
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812 warning("satisfy_failed_metadata_allocation() retries %d times \n\t"
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
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813 " size=%d", loop_count, word_size);
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814 }
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815 } while (true); // Until a GC is done
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816 }
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817
0
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818 // Return true if any of the following is true:
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819 // . the allocation won't fit into the current young gen heap
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820 // . gc locker is occupied (jni critical section)
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821 // . heap memory is tight -- the most recent previous collection
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822 // was a full collection because a partial collection (would
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823 // have) failed and is likely to fail again
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824 bool GenCollectorPolicy::should_try_older_generation_allocation(
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825 size_t word_size) const {
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826 GenCollectedHeap* gch = GenCollectedHeap::heap();
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827 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc();
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828 return (word_size > heap_word_size(gen0_capacity))
1888
a7214d79fcf1 6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
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parents: 1795
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829 || GC_locker::is_active_and_needs_gc()
a7214d79fcf1 6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
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830 || gch->incremental_collection_failed();
0
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831 }
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832
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833
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834 //
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835 // MarkSweepPolicy methods
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836 //
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837
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838 MarkSweepPolicy::MarkSweepPolicy() {
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839 initialize_all();
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840 }
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841
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842 void MarkSweepPolicy::initialize_generations() {
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843 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL);
0
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844 if (_generations == NULL)
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845 vm_exit_during_initialization("Unable to allocate gen spec");
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846
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847 if (UseParNewGC) {
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848 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size);
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849 } else {
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850 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size);
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851 }
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852 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size);
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853
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854 if (_generations[0] == NULL || _generations[1] == NULL)
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855 vm_exit_during_initialization("Unable to allocate gen spec");
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856 }
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857
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858 void MarkSweepPolicy::initialize_gc_policy_counters() {
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859 // initialize the policy counters - 2 collectors, 3 generations
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860 if (UseParNewGC) {
0
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861 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3);
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brutisso
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862 } else {
0
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863 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3);
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864 }
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865 }