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annotate src/share/vm/memory/collectorPolicy.cpp @ 1689:f4f596978298

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author never
date Mon, 09 Aug 2010 17:51:56 -0700
parents c18cbe5936b8
children a8b66e00933b
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1 /*
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2 * Copyright (c) 2001, 2010, 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 "incls/_precompiled.incl"
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26 # include "incls/_collectorPolicy.cpp.incl"
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27
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28 // CollectorPolicy methods.
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29
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30 void CollectorPolicy::initialize_flags() {
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31 if (PermSize > MaxPermSize) {
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32 MaxPermSize = PermSize;
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33 }
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34 PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment()));
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35 MaxPermSize = align_size_up(MaxPermSize, max_alignment());
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36
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37 MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment()));
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38 MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment()));
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39
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40 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment());
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41
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42 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment());
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43 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment());
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44 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment());
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45
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46 assert(PermSize % min_alignment() == 0, "permanent space alignment");
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47 assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment");
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48 assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment");
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49 assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment");
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50 assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment");
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51 if (PermSize < M) {
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52 vm_exit_during_initialization("Too small initial permanent heap");
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53 }
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54 }
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55
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56 void CollectorPolicy::initialize_size_info() {
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57 // User inputs from -mx and ms are aligned
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58 set_initial_heap_byte_size(InitialHeapSize);
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59 if (initial_heap_byte_size() == 0) {
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60 set_initial_heap_byte_size(NewSize + OldSize);
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61 }
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62 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size,
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63 min_alignment()));
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64
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65 set_min_heap_byte_size(Arguments::min_heap_size());
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66 if (min_heap_byte_size() == 0) {
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67 set_min_heap_byte_size(NewSize + OldSize);
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68 }
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69 set_min_heap_byte_size(align_size_up(_min_heap_byte_size,
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70 min_alignment()));
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71
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72 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment()));
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73
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74 // Check heap parameter properties
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75 if (initial_heap_byte_size() < M) {
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76 vm_exit_during_initialization("Too small initial heap");
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77 }
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78 // Check heap parameter properties
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79 if (min_heap_byte_size() < M) {
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80 vm_exit_during_initialization("Too small minimum heap");
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81 }
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82 if (initial_heap_byte_size() <= NewSize) {
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83 // make sure there is at least some room in old space
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84 vm_exit_during_initialization("Too small initial heap for new size specified");
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85 }
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86 if (max_heap_byte_size() < min_heap_byte_size()) {
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87 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified");
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88 }
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89 if (initial_heap_byte_size() < min_heap_byte_size()) {
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90 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified");
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91 }
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92 if (max_heap_byte_size() < initial_heap_byte_size()) {
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93 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified");
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94 }
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95
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96 if (PrintGCDetails && Verbose) {
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97 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap "
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98 SIZE_FORMAT " Maximum heap " SIZE_FORMAT,
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99 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size());
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100 }
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101 }
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102
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103 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) {
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104 _permanent_generation =
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105 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize,
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106 SharedReadOnlySize,
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107 SharedReadWriteSize,
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108 SharedMiscDataSize,
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109 SharedMiscCodeSize);
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110 if (_permanent_generation == NULL) {
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111 vm_exit_during_initialization("Unable to allocate gen spec");
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112 }
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113 }
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114
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115 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) {
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116 bool result = _should_clear_all_soft_refs;
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117 set_should_clear_all_soft_refs(false);
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118 return result;
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119 }
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120
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121 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap,
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122 int max_covered_regions) {
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123 switch (rem_set_name()) {
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124 case GenRemSet::CardTable: {
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125 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions);
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126 return res;
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127 }
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128 default:
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129 guarantee(false, "unrecognized GenRemSet::Name");
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130 return NULL;
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131 }
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132 }
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133
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134 void CollectorPolicy::cleared_all_soft_refs() {
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135 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may
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136 // have been cleared in the last collection but if the gc overhear
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137 // limit continues to be near, SoftRefs should still be cleared.
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138 if (size_policy() != NULL) {
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139 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near();
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140 }
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141 _all_soft_refs_clear = true;
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142 }
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143
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144
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145 // GenCollectorPolicy methods.
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146
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147 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) {
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148 size_t x = base_size / (NewRatio+1);
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149 size_t new_gen_size = x > min_alignment() ?
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150 align_size_down(x, min_alignment()) :
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151 min_alignment();
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152 return new_gen_size;
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153 }
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154
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155 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size,
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156 size_t maximum_size) {
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157 size_t alignment = min_alignment();
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158 size_t max_minus = maximum_size - alignment;
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159 return desired_size < max_minus ? desired_size : max_minus;
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160 }
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161
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162
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163 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size,
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164 size_t init_promo_size,
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165 size_t init_survivor_size) {
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166 const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0;
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167 _size_policy = new AdaptiveSizePolicy(init_eden_size,
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168 init_promo_size,
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169 init_survivor_size,
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170 max_gc_minor_pause_sec,
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171 GCTimeRatio);
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172 }
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173
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174 size_t GenCollectorPolicy::compute_max_alignment() {
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175 // The card marking array and the offset arrays for old generations are
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176 // committed in os pages as well. Make sure they are entirely full (to
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177 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1
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178 // byte entry and the os page size is 4096, the maximum heap size should
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179 // be 512*4096 = 2MB aligned.
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180 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name());
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181
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182 // Parallel GC does its own alignment of the generations to avoid requiring a
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183 // large page (256M on some platforms) for the permanent generation. The
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184 // other collectors should also be updated to do their own alignment and then
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185 // this use of lcm() should be removed.
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186 if (UseLargePages && !UseParallelGC) {
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187 // in presence of large pages we have to make sure that our
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188 // alignment is large page aware
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189 alignment = lcm(os::large_page_size(), alignment);
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190 }
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191
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192 return alignment;
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193 }
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194
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195 void GenCollectorPolicy::initialize_flags() {
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196 // All sizes must be multiples of the generation granularity.
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197 set_min_alignment((uintx) Generation::GenGrain);
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198 set_max_alignment(compute_max_alignment());
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199 assert(max_alignment() >= min_alignment() &&
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200 max_alignment() % min_alignment() == 0,
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201 "invalid alignment constraints");
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202
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203 CollectorPolicy::initialize_flags();
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204
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205 // All generational heaps have a youngest gen; handle those flags here.
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206
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207 // Adjust max size parameters
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208 if (NewSize > MaxNewSize) {
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209 MaxNewSize = NewSize;
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210 }
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211 NewSize = align_size_down(NewSize, min_alignment());
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212 MaxNewSize = align_size_down(MaxNewSize, min_alignment());
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213
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214 // Check validity of heap flags
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215 assert(NewSize % min_alignment() == 0, "eden space alignment");
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216 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment");
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217
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218 if (NewSize < 3*min_alignment()) {
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219 // make sure there room for eden and two survivor spaces
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220 vm_exit_during_initialization("Too small new size specified");
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221 }
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222 if (SurvivorRatio < 1 || NewRatio < 1) {
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223 vm_exit_during_initialization("Invalid heap ratio specified");
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224 }
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225 }
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226
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227 void TwoGenerationCollectorPolicy::initialize_flags() {
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228 GenCollectorPolicy::initialize_flags();
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229
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230 OldSize = align_size_down(OldSize, min_alignment());
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231 if (NewSize + OldSize > MaxHeapSize) {
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232 MaxHeapSize = NewSize + OldSize;
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233 }
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234 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment());
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235
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236 always_do_update_barrier = UseConcMarkSweepGC;
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237 BlockOffsetArrayUseUnallocatedBlock =
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238 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0;
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239
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240 // Check validity of heap flags
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241 assert(OldSize % min_alignment() == 0, "old space alignment");
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242 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment");
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243 }
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244
13
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245 // Values set on the command line win over any ergonomically
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246 // set command line parameters.
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247 // Ergonomic choice of parameters are done before this
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248 // method is called. Values for command line parameters such as NewSize
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249 // and MaxNewSize feed those ergonomic choices into this method.
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250 // This method makes the final generation sizings consistent with
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251 // themselves and with overall heap sizings.
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252 // In the absence of explicitly set command line flags, policies
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253 // such as the use of NewRatio are used to size the generation.
0
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254 void GenCollectorPolicy::initialize_size_info() {
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255 CollectorPolicy::initialize_size_info();
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256
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257 // min_alignment() is used for alignment within a generation.
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258 // There is additional alignment done down stream for some
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259 // collectors that sometimes causes unwanted rounding up of
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260 // generations sizes.
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261
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262 // Determine maximum size of gen0
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263
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264 size_t max_new_size = 0;
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265 if (FLAG_IS_CMDLINE(MaxNewSize)) {
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266 if (MaxNewSize < min_alignment()) {
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267 max_new_size = min_alignment();
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268 } else if (MaxNewSize >= max_heap_byte_size()) {
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269 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(),
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270 min_alignment());
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271 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or "
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272 "greater than the entire heap (" SIZE_FORMAT "k). A "
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273 "new generation size of " SIZE_FORMAT "k will be used.",
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274 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K);
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275 } else {
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276 max_new_size = align_size_down(MaxNewSize, min_alignment());
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277 }
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278
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279 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated
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280 // specially at this point to just use an ergonomically set
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281 // MaxNewSize to set max_new_size. For cases with small
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282 // heaps such a policy often did not work because the MaxNewSize
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283 // was larger than the entire heap. The interpretation given
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284 // to ergonomically set flags is that the flags are set
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285 // by different collectors for their own special needs but
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286 // are not allowed to badly shape the heap. This allows the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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287 // different collectors to decide what's best for themselves
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288 // without having to factor in the overall heap shape. It
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289 // can be the case in the future that the collectors would
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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290 // only make "wise" ergonomics choices and this policy could
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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291 // just accept those choices. The choices currently made are
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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292 // not always "wise".
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293 } else {
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294 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size());
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295 // Bound the maximum size by NewSize below (since it historically
0
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296 // would have been NewSize and because the NewRatio calculation could
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297 // yield a size that is too small) and bound it by MaxNewSize above.
13
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298 // Ergonomics plays here by previously calculating the desired
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299 // NewSize and MaxNewSize.
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300 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize);
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301 }
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302 assert(max_new_size > 0, "All paths should set max_new_size");
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303
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304 // Given the maximum gen0 size, determine the initial and
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305 // minimum sizes.
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306
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307 if (max_heap_byte_size() == min_heap_byte_size()) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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308 // The maximum and minimum heap sizes are the same so
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309 // the generations minimum and initial must be the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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310 // same as its maximum.
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311 set_min_gen0_size(max_new_size);
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312 set_initial_gen0_size(max_new_size);
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313 set_max_gen0_size(max_new_size);
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314 } else {
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315 size_t desired_new_size = 0;
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316 if (!FLAG_IS_DEFAULT(NewSize)) {
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317 // If NewSize is set ergonomically (for example by cms), it
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318 // would make sense to use it. If it is used, also use it
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319 // to set the initial size. Although there is no reason
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320 // the minimum size and the initial size have to be the same,
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321 // the current implementation gets into trouble during the calculation
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322 // of the tenured generation sizes if they are different.
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323 // Note that this makes the initial size and the minimum size
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324 // generally small compared to the NewRatio calculation.
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325 _min_gen0_size = NewSize;
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326 desired_new_size = NewSize;
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327 max_new_size = MAX2(max_new_size, NewSize);
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328 } else {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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329 // For the case where NewSize is the default, use NewRatio
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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330 // to size the minimum and initial generation sizes.
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331 // 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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332 // NewRatio is overly large, the resulting sizes can be too
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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333 // small.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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334 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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335 NewSize);
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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336 desired_new_size =
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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337 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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338 NewSize);
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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339 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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340
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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341 assert(_min_gen0_size > 0, "Sanity check");
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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342 set_initial_gen0_size(desired_new_size);
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343 set_max_gen0_size(max_new_size);
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344
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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345 // 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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346 // determined without regard to the maximum sizes.
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diff changeset
347
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
348 // Bound the sizes by the corresponding overall heap sizes.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
349 set_min_gen0_size(
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
350 bound_minus_alignment(_min_gen0_size, min_heap_byte_size()));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
351 set_initial_gen0_size(
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
352 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size()));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
353 set_max_gen0_size(
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
354 bound_minus_alignment(_max_gen0_size, max_heap_byte_size()));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
355
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
356 // At this point all three sizes have been checked against the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
357 // maximum sizes but have not been checked for consistency
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 13
diff changeset
358 // among the three.
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
359
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
360 // Final check min <= initial <= max
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
361 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
362 set_initial_gen0_size(
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
363 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
364 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size));
0
a61af66fc99e Initial load
duke
parents:
diff changeset
365 }
a61af66fc99e Initial load
duke
parents:
diff changeset
366
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
367 if (PrintGCDetails && Verbose) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
368 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 "
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
369 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
370 min_gen0_size(), initial_gen0_size(), max_gen0_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
371 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
372 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
373
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
374 // 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
375 // 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
376 // the most freedom in sizing because it is done before the
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
377 // 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
378 // 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
379 // 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
380 // 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
381 // keeping it simple also seems a worthwhile goal.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
382 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
383 size_t* gen1_size_ptr,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
384 size_t heap_size,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
385 size_t min_gen0_size) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
386 bool result = false;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
387 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
388 if (((*gen0_size_ptr + OldSize) > heap_size) &&
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
389 (heap_size - min_gen0_size) >= min_alignment()) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
390 // Adjust gen0 down to accomodate OldSize
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
391 *gen0_size_ptr = heap_size - min_gen0_size;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
392 *gen0_size_ptr =
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
393 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
394 min_alignment());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
395 assert(*gen0_size_ptr > 0, "Min gen0 is too large");
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
396 result = true;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
397 } else {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
398 *gen1_size_ptr = heap_size - *gen0_size_ptr;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
399 *gen1_size_ptr =
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
400 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
401 min_alignment());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
402 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
403 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
404 return result;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
405 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
406
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
407 // 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
408 // 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
409 // 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
410 // 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
411 // 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
412 // but allow the values to pass.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
413
a61af66fc99e Initial load
duke
parents:
diff changeset
414 void TwoGenerationCollectorPolicy::initialize_size_info() {
a61af66fc99e Initial load
duke
parents:
diff changeset
415 GenCollectorPolicy::initialize_size_info();
a61af66fc99e Initial load
duke
parents:
diff changeset
416
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
417 // 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
418 // 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
419 // The maximum gen1 size can be determined from the maximum gen0
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
420 // and maximum heap size since not explicit flags exits
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
421 // for setting the gen1 maximum.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
422 _max_gen1_size = max_heap_byte_size() - _max_gen0_size;
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
423 _max_gen1_size =
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
424 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
425 min_alignment());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
426 // 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
427 // 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
428 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
429 // 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
430 // 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
431 // 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
432 // the minimum, maximum and initial sizes consistent
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
433 // with the gen0 sizes and the overall heap sizes.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
434 assert(min_heap_byte_size() > _min_gen0_size,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
435 "gen0 has an unexpected minimum size");
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
436 set_min_gen1_size(min_heap_byte_size() - min_gen0_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
437 set_min_gen1_size(
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
438 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
439 min_alignment()));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
440 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
441 set_initial_gen1_size(
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
442 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()),
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
443 min_alignment()));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
444
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
445 } else {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
446 // 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
447 // OldSize and then determine the consequences.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
448 set_min_gen1_size(OldSize);
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
449 set_initial_gen1_size(OldSize);
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
450
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
451 // 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
452 // with other command line flags, issue a warning.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
453 // The generation minimums and the overall heap mimimum should
a61af66fc99e Initial load
duke
parents:
diff changeset
454 // be within one heap alignment.
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
455 if ((_min_gen1_size + _min_gen0_size + min_alignment()) <
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
456 min_heap_byte_size()) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
457 warning("Inconsistency between minimum heap size and minimum "
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
458 "generation sizes: using minimum heap = " SIZE_FORMAT,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
459 min_heap_byte_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
460 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
461 if ((OldSize > _max_gen1_size)) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
462 warning("Inconsistency between maximum heap size and maximum "
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
463 "generation sizes: using maximum heap = " SIZE_FORMAT
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
464 " -XX:OldSize flag is being ignored",
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
465 max_heap_byte_size());
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 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
468 // 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
469 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
470 min_heap_byte_size(), OldSize)) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
471 if (PrintGCDetails && Verbose) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
472 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 "
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
473 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
474 min_gen0_size(), initial_gen0_size(), max_gen0_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
475 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
476 }
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
477 // Initial size
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
478 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
479 initial_heap_byte_size(), OldSize)) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
480 if (PrintGCDetails && Verbose) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
481 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 "
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
482 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
483 min_gen0_size(), initial_gen0_size(), max_gen0_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
484 }
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
485 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
486 }
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
487 // Enforce the maximum gen1 size.
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
488 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size));
0
a61af66fc99e Initial load
duke
parents:
diff changeset
489
13
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
490 // Check that min gen1 <= initial gen1 <= max gen1
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
491 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
492 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size));
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
493
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
494 if (PrintGCDetails && Verbose) {
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
495 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
496 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT,
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
497 min_gen1_size(), initial_gen1_size(), max_gen1_size());
183f41cf8bfe 6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents: 0
diff changeset
498 }
0
a61af66fc99e Initial load
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parents:
diff changeset
499 }
a61af66fc99e Initial load
duke
parents:
diff changeset
500
a61af66fc99e Initial load
duke
parents:
diff changeset
501 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size,
a61af66fc99e Initial load
duke
parents:
diff changeset
502 bool is_tlab,
a61af66fc99e Initial load
duke
parents:
diff changeset
503 bool* gc_overhead_limit_was_exceeded) {
a61af66fc99e Initial load
duke
parents:
diff changeset
504 GenCollectedHeap *gch = GenCollectedHeap::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
505
a61af66fc99e Initial load
duke
parents:
diff changeset
506 debug_only(gch->check_for_valid_allocation_state());
a61af66fc99e Initial load
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parents:
diff changeset
507 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
508
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
509 // 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
510 // 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
511 // 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
512 *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
513
0
a61af66fc99e Initial load
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parents:
diff changeset
514 HeapWord* result = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
515
a61af66fc99e Initial load
duke
parents:
diff changeset
516 // Loop until the allocation is satisified,
a61af66fc99e Initial load
duke
parents:
diff changeset
517 // or unsatisfied after GC.
a61af66fc99e Initial load
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parents:
diff changeset
518 for (int try_count = 1; /* return or throw */; try_count += 1) {
a61af66fc99e Initial load
duke
parents:
diff changeset
519 HandleMark hm; // discard any handles allocated in each iteration
a61af66fc99e Initial load
duke
parents:
diff changeset
520
a61af66fc99e Initial load
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parents:
diff changeset
521 // First allocation attempt is lock-free.
a61af66fc99e Initial load
duke
parents:
diff changeset
522 Generation *gen0 = gch->get_gen(0);
a61af66fc99e Initial load
duke
parents:
diff changeset
523 assert(gen0->supports_inline_contig_alloc(),
a61af66fc99e Initial load
duke
parents:
diff changeset
524 "Otherwise, must do alloc within heap lock");
a61af66fc99e Initial load
duke
parents:
diff changeset
525 if (gen0->should_allocate(size, is_tlab)) {
a61af66fc99e Initial load
duke
parents:
diff changeset
526 result = gen0->par_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
527 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
528 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
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parents:
diff changeset
529 return result;
a61af66fc99e Initial load
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parents:
diff changeset
530 }
a61af66fc99e Initial load
duke
parents:
diff changeset
531 }
a61af66fc99e Initial load
duke
parents:
diff changeset
532 unsigned int gc_count_before; // read inside the Heap_lock locked region
a61af66fc99e Initial load
duke
parents:
diff changeset
533 {
a61af66fc99e Initial load
duke
parents:
diff changeset
534 MutexLocker ml(Heap_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
535 if (PrintGC && Verbose) {
a61af66fc99e Initial load
duke
parents:
diff changeset
536 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:"
a61af66fc99e Initial load
duke
parents:
diff changeset
537 " attempting locked slow path allocation");
a61af66fc99e Initial load
duke
parents:
diff changeset
538 }
a61af66fc99e Initial load
duke
parents:
diff changeset
539 // Note that only large objects get a shot at being
a61af66fc99e Initial load
duke
parents:
diff changeset
540 // allocated in later generations.
a61af66fc99e Initial load
duke
parents:
diff changeset
541 bool first_only = ! should_try_older_generation_allocation(size);
a61af66fc99e Initial load
duke
parents:
diff changeset
542
a61af66fc99e Initial load
duke
parents:
diff changeset
543 result = gch->attempt_allocation(size, is_tlab, first_only);
a61af66fc99e Initial load
duke
parents:
diff changeset
544 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
545 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
546 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
547 }
a61af66fc99e Initial load
duke
parents:
diff changeset
548
a61af66fc99e Initial load
duke
parents:
diff changeset
549 if (GC_locker::is_active_and_needs_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
550 if (is_tlab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
551 return NULL; // Caller will retry allocating individual object
a61af66fc99e Initial load
duke
parents:
diff changeset
552 }
a61af66fc99e Initial load
duke
parents:
diff changeset
553 if (!gch->is_maximal_no_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
554 // Try and expand heap to satisfy request
a61af66fc99e Initial load
duke
parents:
diff changeset
555 result = expand_heap_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
556 // result could be null if we are out of space
a61af66fc99e Initial load
duke
parents:
diff changeset
557 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
558 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
559 }
a61af66fc99e Initial load
duke
parents:
diff changeset
560 }
a61af66fc99e Initial load
duke
parents:
diff changeset
561
a61af66fc99e Initial load
duke
parents:
diff changeset
562 // If this thread is not in a jni critical section, we stall
a61af66fc99e Initial load
duke
parents:
diff changeset
563 // the requestor until the critical section has cleared and
a61af66fc99e Initial load
duke
parents:
diff changeset
564 // GC allowed. When the critical section clears, a GC is
a61af66fc99e Initial load
duke
parents:
diff changeset
565 // initiated by the last thread exiting the critical section; so
a61af66fc99e Initial load
duke
parents:
diff changeset
566 // we retry the allocation sequence from the beginning of the loop,
a61af66fc99e Initial load
duke
parents:
diff changeset
567 // rather than causing more, now probably unnecessary, GC attempts.
a61af66fc99e Initial load
duke
parents:
diff changeset
568 JavaThread* jthr = JavaThread::current();
a61af66fc99e Initial load
duke
parents:
diff changeset
569 if (!jthr->in_critical()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
570 MutexUnlocker mul(Heap_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
571 // Wait for JNI critical section to be exited
a61af66fc99e Initial load
duke
parents:
diff changeset
572 GC_locker::stall_until_clear();
a61af66fc99e Initial load
duke
parents:
diff changeset
573 continue;
a61af66fc99e Initial load
duke
parents:
diff changeset
574 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
575 if (CheckJNICalls) {
a61af66fc99e Initial load
duke
parents:
diff changeset
576 fatal("Possible deadlock due to allocating while"
a61af66fc99e Initial load
duke
parents:
diff changeset
577 " in jni critical section");
a61af66fc99e Initial load
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parents:
diff changeset
578 }
a61af66fc99e Initial load
duke
parents:
diff changeset
579 return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
580 }
a61af66fc99e Initial load
duke
parents:
diff changeset
581 }
a61af66fc99e Initial load
duke
parents:
diff changeset
582
a61af66fc99e Initial load
duke
parents:
diff changeset
583 // Read the gc count while the heap lock is held.
a61af66fc99e Initial load
duke
parents:
diff changeset
584 gc_count_before = Universe::heap()->total_collections();
a61af66fc99e Initial load
duke
parents:
diff changeset
585 }
a61af66fc99e Initial load
duke
parents:
diff changeset
586
a61af66fc99e Initial load
duke
parents:
diff changeset
587 VM_GenCollectForAllocation op(size,
a61af66fc99e Initial load
duke
parents:
diff changeset
588 is_tlab,
a61af66fc99e Initial load
duke
parents:
diff changeset
589 gc_count_before);
a61af66fc99e Initial load
duke
parents:
diff changeset
590 VMThread::execute(&op);
a61af66fc99e Initial load
duke
parents:
diff changeset
591 if (op.prologue_succeeded()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
592 result = op.result();
a61af66fc99e Initial load
duke
parents:
diff changeset
593 if (op.gc_locked()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
594 assert(result == NULL, "must be NULL if gc_locked() is true");
a61af66fc99e Initial load
duke
parents:
diff changeset
595 continue; // retry and/or stall as necessary
a61af66fc99e Initial load
duke
parents:
diff changeset
596 }
1387
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
597
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
598 // 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
599 // 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
600 // 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
601 // 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
602 // 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
603
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
604 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
605 const bool softrefs_clear = all_soft_refs_clear();
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
606 assert(!limit_exceeded || softrefs_clear, "Should have been cleared");
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
607 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
608 *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
609 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
610 if (op.result() != NULL) {
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
611 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
612 }
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
613 return NULL;
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
diff changeset
614 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
615 assert(result == NULL || gch->is_in_reserved(result),
a61af66fc99e Initial load
duke
parents:
diff changeset
616 "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
617 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
618 }
a61af66fc99e Initial load
duke
parents:
diff changeset
619
a61af66fc99e Initial load
duke
parents:
diff changeset
620 // Give a warning if we seem to be looping forever.
a61af66fc99e Initial load
duke
parents:
diff changeset
621 if ((QueuedAllocationWarningCount > 0) &&
a61af66fc99e Initial load
duke
parents:
diff changeset
622 (try_count % QueuedAllocationWarningCount == 0)) {
a61af66fc99e Initial load
duke
parents:
diff changeset
623 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t"
a61af66fc99e Initial load
duke
parents:
diff changeset
624 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : "");
a61af66fc99e Initial load
duke
parents:
diff changeset
625 }
a61af66fc99e Initial load
duke
parents:
diff changeset
626 }
a61af66fc99e Initial load
duke
parents:
diff changeset
627 }
a61af66fc99e Initial load
duke
parents:
diff changeset
628
a61af66fc99e Initial load
duke
parents:
diff changeset
629 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size,
a61af66fc99e Initial load
duke
parents:
diff changeset
630 bool is_tlab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
631 GenCollectedHeap *gch = GenCollectedHeap::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
632 HeapWord* result = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
633 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) {
a61af66fc99e Initial load
duke
parents:
diff changeset
634 Generation *gen = gch->get_gen(i);
a61af66fc99e Initial load
duke
parents:
diff changeset
635 if (gen->should_allocate(size, is_tlab)) {
a61af66fc99e Initial load
duke
parents:
diff changeset
636 result = gen->expand_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
637 }
a61af66fc99e Initial load
duke
parents:
diff changeset
638 }
a61af66fc99e Initial load
duke
parents:
diff changeset
639 assert(result == NULL || gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
640 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
641 }
a61af66fc99e Initial load
duke
parents:
diff changeset
642
a61af66fc99e Initial load
duke
parents:
diff changeset
643 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size,
a61af66fc99e Initial load
duke
parents:
diff changeset
644 bool is_tlab) {
a61af66fc99e Initial load
duke
parents:
diff changeset
645 GenCollectedHeap *gch = GenCollectedHeap::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
646 GCCauseSetter x(gch, GCCause::_allocation_failure);
a61af66fc99e Initial load
duke
parents:
diff changeset
647 HeapWord* result = NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
648
a61af66fc99e Initial load
duke
parents:
diff changeset
649 assert(size != 0, "Precondition violated");
a61af66fc99e Initial load
duke
parents:
diff changeset
650 if (GC_locker::is_active_and_needs_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
651 // GC locker is active; instead of a collection we will attempt
a61af66fc99e Initial load
duke
parents:
diff changeset
652 // to expand the heap, if there's room for expansion.
a61af66fc99e Initial load
duke
parents:
diff changeset
653 if (!gch->is_maximal_no_gc()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
654 result = expand_heap_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
655 }
a61af66fc99e Initial load
duke
parents:
diff changeset
656 return result; // could be null if we are out of space
a61af66fc99e Initial load
duke
parents:
diff changeset
657 } else if (!gch->incremental_collection_will_fail()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
658 // The gc_prologues have not executed yet. The value
a61af66fc99e Initial load
duke
parents:
diff changeset
659 // for incremental_collection_will_fail() is the remanent
a61af66fc99e Initial load
duke
parents:
diff changeset
660 // of the last collection.
a61af66fc99e Initial load
duke
parents:
diff changeset
661 // Do an incremental collection.
a61af66fc99e Initial load
duke
parents:
diff changeset
662 gch->do_collection(false /* full */,
a61af66fc99e Initial load
duke
parents:
diff changeset
663 false /* clear_all_soft_refs */,
a61af66fc99e Initial load
duke
parents:
diff changeset
664 size /* size */,
a61af66fc99e Initial load
duke
parents:
diff changeset
665 is_tlab /* is_tlab */,
a61af66fc99e Initial load
duke
parents:
diff changeset
666 number_of_generations() - 1 /* max_level */);
a61af66fc99e Initial load
duke
parents:
diff changeset
667 } else {
a61af66fc99e Initial load
duke
parents:
diff changeset
668 // Try a full collection; see delta for bug id 6266275
a61af66fc99e Initial load
duke
parents:
diff changeset
669 // for the original code and why this has been simplified
a61af66fc99e Initial load
duke
parents:
diff changeset
670 // with from-space allocation criteria modified and
a61af66fc99e Initial load
duke
parents:
diff changeset
671 // such allocation moved out of the safepoint path.
a61af66fc99e Initial load
duke
parents:
diff changeset
672 gch->do_collection(true /* full */,
a61af66fc99e Initial load
duke
parents:
diff changeset
673 false /* clear_all_soft_refs */,
a61af66fc99e Initial load
duke
parents:
diff changeset
674 size /* size */,
a61af66fc99e Initial load
duke
parents:
diff changeset
675 is_tlab /* is_tlab */,
a61af66fc99e Initial load
duke
parents:
diff changeset
676 number_of_generations() - 1 /* max_level */);
a61af66fc99e Initial load
duke
parents:
diff changeset
677 }
a61af66fc99e Initial load
duke
parents:
diff changeset
678
a61af66fc99e Initial load
duke
parents:
diff changeset
679 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/);
a61af66fc99e Initial load
duke
parents:
diff changeset
680
a61af66fc99e Initial load
duke
parents:
diff changeset
681 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
682 assert(gch->is_in_reserved(result), "result not in heap");
a61af66fc99e Initial load
duke
parents:
diff changeset
683 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
684 }
a61af66fc99e Initial load
duke
parents:
diff changeset
685
a61af66fc99e Initial load
duke
parents:
diff changeset
686 // OK, collection failed, try expansion.
a61af66fc99e Initial load
duke
parents:
diff changeset
687 result = expand_heap_and_allocate(size, is_tlab);
a61af66fc99e Initial load
duke
parents:
diff changeset
688 if (result != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
689 return result;
a61af66fc99e Initial load
duke
parents:
diff changeset
690 }
a61af66fc99e Initial load
duke
parents:
diff changeset
691
a61af66fc99e Initial load
duke
parents:
diff changeset
692 // If we reach this point, we're really out of memory. Try every trick
a61af66fc99e Initial load
duke
parents:
diff changeset
693 // we can to reclaim memory. Force collection of soft references. Force
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694 // a complete compaction of the heap. Any additional methods for finding
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695 // free memory should be here, especially if they are expensive. If this
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696 // attempt fails, an OOM exception will be thrown.
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697 {
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698 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted
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699
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700 gch->do_collection(true /* full */,
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701 true /* clear_all_soft_refs */,
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702 size /* size */,
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703 is_tlab /* is_tlab */,
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704 number_of_generations() - 1 /* max_level */);
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705 }
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706
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707 result = gch->attempt_allocation(size, is_tlab, false /* first_only */);
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708 if (result != NULL) {
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709 assert(gch->is_in_reserved(result), "result not in heap");
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710 return result;
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711 }
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712
1387
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents: 1064
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713 assert(!should_clear_all_soft_refs(),
0bfd3fb24150 6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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diff changeset
714 "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.
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715
0
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716 // What else? We might try synchronous finalization later. If the total
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717 // space available is large enough for the allocation, then a more
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718 // complete compaction phase than we've tried so far might be
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719 // appropriate.
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720 return NULL;
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721 }
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722
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723 size_t GenCollectorPolicy::large_typearray_limit() {
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724 return FastAllocateSizeLimit;
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725 }
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726
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727 // Return true if any of the following is true:
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728 // . the allocation won't fit into the current young gen heap
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729 // . gc locker is occupied (jni critical section)
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730 // . heap memory is tight -- the most recent previous collection
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731 // was a full collection because a partial collection (would
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732 // have) failed and is likely to fail again
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733 bool GenCollectorPolicy::should_try_older_generation_allocation(
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734 size_t word_size) const {
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735 GenCollectedHeap* gch = GenCollectedHeap::heap();
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736 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc();
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737 return (word_size > heap_word_size(gen0_capacity))
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738 || (GC_locker::is_active_and_needs_gc())
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739 || ( gch->last_incremental_collection_failed()
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740 && gch->incremental_collection_will_fail());
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741 }
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742
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743
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744 //
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745 // MarkSweepPolicy methods
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746 //
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747
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748 MarkSweepPolicy::MarkSweepPolicy() {
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749 initialize_all();
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750 }
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751
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752 void MarkSweepPolicy::initialize_generations() {
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753 initialize_perm_generation(PermGen::MarkSweepCompact);
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754 _generations = new GenerationSpecPtr[number_of_generations()];
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755 if (_generations == NULL)
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756 vm_exit_during_initialization("Unable to allocate gen spec");
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757
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758 if (UseParNewGC && ParallelGCThreads > 0) {
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759 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size);
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760 } else {
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761 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size);
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762 }
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763 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size);
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764
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765 if (_generations[0] == NULL || _generations[1] == NULL)
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766 vm_exit_during_initialization("Unable to allocate gen spec");
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767 }
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parents:
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768
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769 void MarkSweepPolicy::initialize_gc_policy_counters() {
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770 // initialize the policy counters - 2 collectors, 3 generations
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parents:
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771 if (UseParNewGC && ParallelGCThreads > 0) {
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parents:
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772 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3);
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parents:
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773 }
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parents:
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774 else {
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parents:
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775 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3);
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parents:
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776 }
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parents:
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777 }