Mercurial > hg > graal-compiler
annotate src/share/vm/memory/collectorPolicy.cpp @ 20591:28051f14c328
8043158: Crash in CodeSweeperSweepNoFlushTest in CompileQueue::free_all()
Summary: Acquire lock before calling notify()
Reviewed-by: twisti, thartmann
author | anoll |
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date | Fri, 20 Jun 2014 09:25:13 +0200 |
parents | 833b0f92429a |
children | d63ce76a0f0e |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" | |
27 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
28 #include "gc_implementation/shared/vmGCOperations.hpp" | |
29 #include "memory/cardTableRS.hpp" | |
30 #include "memory/collectorPolicy.hpp" | |
31 #include "memory/gcLocker.inline.hpp" | |
32 #include "memory/genCollectedHeap.hpp" | |
33 #include "memory/generationSpec.hpp" | |
34 #include "memory/space.hpp" | |
35 #include "memory/universe.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/globals_extension.hpp" | |
38 #include "runtime/handles.inline.hpp" | |
39 #include "runtime/java.hpp" | |
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40 #include "runtime/thread.inline.hpp" |
1972 | 41 #include "runtime/vmThread.hpp" |
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42 #include "utilities/macros.hpp" |
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43 #if INCLUDE_ALL_GCS |
1972 | 44 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" |
45 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp" | |
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46 #endif // INCLUDE_ALL_GCS |
0 | 47 |
48 // CollectorPolicy methods. | |
49 | |
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50 CollectorPolicy::CollectorPolicy() : |
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51 _space_alignment(0), |
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52 _heap_alignment(0), |
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53 _initial_heap_byte_size(InitialHeapSize), |
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54 _max_heap_byte_size(MaxHeapSize), |
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55 _min_heap_byte_size(Arguments::min_heap_size()), |
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56 _max_heap_size_cmdline(false), |
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57 _size_policy(NULL), |
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58 _should_clear_all_soft_refs(false), |
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59 _all_soft_refs_clear(false) |
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60 {} |
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61 |
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62 #ifdef ASSERT |
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63 void CollectorPolicy::assert_flags() { |
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64 assert(InitialHeapSize <= MaxHeapSize, "Ergonomics decided on incompatible initial and maximum heap sizes"); |
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65 assert(InitialHeapSize % _heap_alignment == 0, "InitialHeapSize alignment"); |
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66 assert(MaxHeapSize % _heap_alignment == 0, "MaxHeapSize alignment"); |
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67 } |
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68 |
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69 void CollectorPolicy::assert_size_info() { |
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70 assert(InitialHeapSize == _initial_heap_byte_size, "Discrepancy between InitialHeapSize flag and local storage"); |
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71 assert(MaxHeapSize == _max_heap_byte_size, "Discrepancy between MaxHeapSize flag and local storage"); |
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72 assert(_max_heap_byte_size >= _min_heap_byte_size, "Ergonomics decided on incompatible minimum and maximum heap sizes"); |
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73 assert(_initial_heap_byte_size >= _min_heap_byte_size, "Ergonomics decided on incompatible initial and minimum heap sizes"); |
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74 assert(_max_heap_byte_size >= _initial_heap_byte_size, "Ergonomics decided on incompatible initial and maximum heap sizes"); |
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75 assert(_min_heap_byte_size % _heap_alignment == 0, "min_heap_byte_size alignment"); |
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76 assert(_initial_heap_byte_size % _heap_alignment == 0, "initial_heap_byte_size alignment"); |
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77 assert(_max_heap_byte_size % _heap_alignment == 0, "max_heap_byte_size alignment"); |
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78 } |
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79 #endif // ASSERT |
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80 |
0 | 81 void CollectorPolicy::initialize_flags() { |
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82 assert(_space_alignment != 0, "Space alignment not set up properly"); |
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83 assert(_heap_alignment != 0, "Heap alignment not set up properly"); |
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84 assert(_heap_alignment >= _space_alignment, |
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85 err_msg("heap_alignment: " SIZE_FORMAT " less than space_alignment: " SIZE_FORMAT, |
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86 _heap_alignment, _space_alignment)); |
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87 assert(_heap_alignment % _space_alignment == 0, |
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88 err_msg("heap_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT, |
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89 _heap_alignment, _space_alignment)); |
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90 |
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91 if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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92 if (FLAG_IS_CMDLINE(InitialHeapSize) && InitialHeapSize > MaxHeapSize) { |
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93 vm_exit_during_initialization("Initial heap size set to a larger value than the maximum heap size"); |
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94 } |
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95 if (_min_heap_byte_size != 0 && MaxHeapSize < _min_heap_byte_size) { |
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96 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
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97 } |
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98 _max_heap_size_cmdline = true; |
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99 } |
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100 |
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101 // Check heap parameter properties |
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102 if (InitialHeapSize < M) { |
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103 vm_exit_during_initialization("Too small initial heap"); |
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104 } |
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105 if (_min_heap_byte_size < M) { |
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106 vm_exit_during_initialization("Too small minimum heap"); |
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107 } |
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108 |
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109 // User inputs from -Xmx and -Xms must be aligned |
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110 _min_heap_byte_size = align_size_up(_min_heap_byte_size, _heap_alignment); |
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111 uintx aligned_initial_heap_size = align_size_up(InitialHeapSize, _heap_alignment); |
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112 uintx aligned_max_heap_size = align_size_up(MaxHeapSize, _heap_alignment); |
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113 |
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114 // Write back to flags if the values changed |
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115 if (aligned_initial_heap_size != InitialHeapSize) { |
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116 FLAG_SET_ERGO(uintx, InitialHeapSize, aligned_initial_heap_size); |
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117 } |
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118 if (aligned_max_heap_size != MaxHeapSize) { |
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119 FLAG_SET_ERGO(uintx, MaxHeapSize, aligned_max_heap_size); |
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120 } |
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121 |
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122 if (FLAG_IS_CMDLINE(InitialHeapSize) && _min_heap_byte_size != 0 && |
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123 InitialHeapSize < _min_heap_byte_size) { |
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124 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
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125 } |
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126 if (!FLAG_IS_DEFAULT(InitialHeapSize) && InitialHeapSize > MaxHeapSize) { |
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127 FLAG_SET_ERGO(uintx, MaxHeapSize, InitialHeapSize); |
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128 } else if (!FLAG_IS_DEFAULT(MaxHeapSize) && InitialHeapSize > MaxHeapSize) { |
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129 FLAG_SET_ERGO(uintx, InitialHeapSize, MaxHeapSize); |
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130 if (InitialHeapSize < _min_heap_byte_size) { |
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131 _min_heap_byte_size = InitialHeapSize; |
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132 } |
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133 } |
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134 |
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135 _initial_heap_byte_size = InitialHeapSize; |
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136 _max_heap_byte_size = MaxHeapSize; |
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137 |
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138 FLAG_SET_ERGO(uintx, MinHeapDeltaBytes, align_size_up(MinHeapDeltaBytes, _space_alignment)); |
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139 |
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140 DEBUG_ONLY(CollectorPolicy::assert_flags();) |
0 | 141 } |
142 | |
143 void CollectorPolicy::initialize_size_info() { | |
13
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144 if (PrintGCDetails && Verbose) { |
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145 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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146 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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147 _min_heap_byte_size, _initial_heap_byte_size, _max_heap_byte_size); |
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148 } |
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149 |
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150 DEBUG_ONLY(CollectorPolicy::assert_size_info();) |
0 | 151 } |
152 | |
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153 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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154 bool result = _should_clear_all_soft_refs; |
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155 set_should_clear_all_soft_refs(false); |
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156 return result; |
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157 } |
0 | 158 |
159 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
160 int max_covered_regions) { | |
12350 | 161 return new CardTableRS(whole_heap, max_covered_regions); |
0 | 162 } |
163 | |
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164 void CollectorPolicy::cleared_all_soft_refs() { |
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165 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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166 // have been cleared in the last collection but if the gc overhear |
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167 // limit continues to be near, SoftRefs should still be cleared. |
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168 if (size_policy() != NULL) { |
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169 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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170 } |
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171 _all_soft_refs_clear = true; |
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172 } |
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173 |
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174 size_t CollectorPolicy::compute_heap_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 |
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181 // There is only the GenRemSet in Hotspot and only the GenRemSet::CardTable |
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182 // is supported. |
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183 // Requirements of any new remembered set implementations must be added here. |
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184 size_t alignment = GenRemSet::max_alignment_constraint(GenRemSet::CardTable); |
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185 |
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186 // Parallel GC does its own alignment of the generations to avoid requiring a |
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187 // large page (256M on some platforms) for the permanent generation. The |
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188 // other collectors should also be updated to do their own alignment and then |
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189 // this use of lcm() should be removed. |
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190 if (UseLargePages && !UseParallelGC) { |
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191 // in presence of large pages we have to make sure that our |
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192 // alignment is large page aware |
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193 alignment = lcm(os::large_page_size(), alignment); |
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194 } |
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195 |
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196 return alignment; |
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197 } |
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198 |
0 | 199 // GenCollectorPolicy methods. |
200 | |
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201 GenCollectorPolicy::GenCollectorPolicy() : |
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202 _min_gen0_size(0), |
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203 _initial_gen0_size(0), |
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204 _max_gen0_size(0), |
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205 _gen_alignment(0), |
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206 _generations(NULL) |
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207 {} |
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208 |
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209 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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210 return align_size_down_bounded(base_size / (NewRatio + 1), _gen_alignment); |
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211 } |
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212 |
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213 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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214 size_t maximum_size) { |
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215 size_t max_minus = maximum_size - _gen_alignment; |
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216 return desired_size < max_minus ? desired_size : max_minus; |
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217 } |
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218 |
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219 |
0 | 220 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
221 size_t init_promo_size, | |
222 size_t init_survivor_size) { | |
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223 const double max_gc_pause_sec = ((double) MaxGCPauseMillis) / 1000.0; |
0 | 224 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
225 init_promo_size, | |
226 init_survivor_size, | |
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227 max_gc_pause_sec, |
0 | 228 GCTimeRatio); |
229 } | |
230 | |
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231 size_t GenCollectorPolicy::young_gen_size_lower_bound() { |
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232 // The young generation must be aligned and have room for eden + two survivors |
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233 return align_size_up(3 * _space_alignment, _gen_alignment); |
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234 } |
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235 |
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236 #ifdef ASSERT |
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237 void GenCollectorPolicy::assert_flags() { |
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238 CollectorPolicy::assert_flags(); |
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239 assert(NewSize >= _min_gen0_size, "Ergonomics decided on a too small young gen size"); |
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240 assert(NewSize <= MaxNewSize, "Ergonomics decided on incompatible initial and maximum young gen sizes"); |
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241 assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young gen and heap sizes"); |
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242 assert(NewSize % _gen_alignment == 0, "NewSize alignment"); |
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243 assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize % _gen_alignment == 0, "MaxNewSize alignment"); |
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244 } |
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245 |
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246 void TwoGenerationCollectorPolicy::assert_flags() { |
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247 GenCollectorPolicy::assert_flags(); |
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248 assert(OldSize + NewSize <= MaxHeapSize, "Ergonomics decided on incompatible generation and heap sizes"); |
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249 assert(OldSize % _gen_alignment == 0, "OldSize alignment"); |
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250 } |
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251 |
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252 void GenCollectorPolicy::assert_size_info() { |
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253 CollectorPolicy::assert_size_info(); |
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254 // GenCollectorPolicy::initialize_size_info may update the MaxNewSize |
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255 assert(MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young and heap sizes"); |
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256 assert(NewSize == _initial_gen0_size, "Discrepancy between NewSize flag and local storage"); |
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257 assert(MaxNewSize == _max_gen0_size, "Discrepancy between MaxNewSize flag and local storage"); |
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258 assert(_min_gen0_size <= _initial_gen0_size, "Ergonomics decided on incompatible minimum and initial young gen sizes"); |
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259 assert(_initial_gen0_size <= _max_gen0_size, "Ergonomics decided on incompatible initial and maximum young gen sizes"); |
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260 assert(_min_gen0_size % _gen_alignment == 0, "_min_gen0_size alignment"); |
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261 assert(_initial_gen0_size % _gen_alignment == 0, "_initial_gen0_size alignment"); |
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262 assert(_max_gen0_size % _gen_alignment == 0, "_max_gen0_size alignment"); |
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263 } |
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264 |
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265 void TwoGenerationCollectorPolicy::assert_size_info() { |
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266 GenCollectorPolicy::assert_size_info(); |
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267 assert(OldSize == _initial_gen1_size, "Discrepancy between OldSize flag and local storage"); |
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268 assert(_min_gen1_size <= _initial_gen1_size, "Ergonomics decided on incompatible minimum and initial old gen sizes"); |
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269 assert(_initial_gen1_size <= _max_gen1_size, "Ergonomics decided on incompatible initial and maximum old gen sizes"); |
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270 assert(_max_gen1_size % _gen_alignment == 0, "_max_gen1_size alignment"); |
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271 assert(_initial_gen1_size % _gen_alignment == 0, "_initial_gen1_size alignment"); |
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272 assert(_max_heap_byte_size <= (_max_gen0_size + _max_gen1_size), "Total maximum heap sizes must be sum of generation maximum sizes"); |
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273 } |
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274 #endif // ASSERT |
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275 |
0 | 276 void GenCollectorPolicy::initialize_flags() { |
277 CollectorPolicy::initialize_flags(); | |
278 | |
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279 assert(_gen_alignment != 0, "Generation alignment not set up properly"); |
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280 assert(_heap_alignment >= _gen_alignment, |
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281 err_msg("heap_alignment: " SIZE_FORMAT " less than gen_alignment: " SIZE_FORMAT, |
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282 _heap_alignment, _gen_alignment)); |
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283 assert(_gen_alignment % _space_alignment == 0, |
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284 err_msg("gen_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT, |
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285 _gen_alignment, _space_alignment)); |
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286 assert(_heap_alignment % _gen_alignment == 0, |
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287 err_msg("heap_alignment: " SIZE_FORMAT " not aligned by gen_alignment: " SIZE_FORMAT, |
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288 _heap_alignment, _gen_alignment)); |
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289 |
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290 // All generational heaps have a youngest gen; handle those flags here |
0 | 291 |
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292 // Make sure the heap is large enough for two generations |
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293 uintx smallest_new_size = young_gen_size_lower_bound(); |
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294 uintx smallest_heap_size = align_size_up(smallest_new_size + align_size_up(_space_alignment, _gen_alignment), |
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295 _heap_alignment); |
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296 if (MaxHeapSize < smallest_heap_size) { |
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297 FLAG_SET_ERGO(uintx, MaxHeapSize, smallest_heap_size); |
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298 _max_heap_byte_size = MaxHeapSize; |
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299 } |
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300 // If needed, synchronize _min_heap_byte size and _initial_heap_byte_size |
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301 if (_min_heap_byte_size < smallest_heap_size) { |
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302 _min_heap_byte_size = smallest_heap_size; |
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303 if (InitialHeapSize < _min_heap_byte_size) { |
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304 FLAG_SET_ERGO(uintx, InitialHeapSize, smallest_heap_size); |
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305 _initial_heap_byte_size = smallest_heap_size; |
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306 } |
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307 } |
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308 |
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309 // Now take the actual NewSize into account. We will silently increase NewSize |
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310 // if the user specified a smaller or unaligned value. |
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311 smallest_new_size = MAX2(smallest_new_size, (uintx)align_size_down(NewSize, _gen_alignment)); |
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312 if (smallest_new_size != NewSize) { |
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313 // Do not use FLAG_SET_ERGO to update NewSize here, since this will override |
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314 // if NewSize was set on the command line or not. This information is needed |
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315 // later when setting the initial and minimum young generation size. |
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316 NewSize = smallest_new_size; |
0 | 317 } |
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318 _initial_gen0_size = NewSize; |
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319 |
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320 if (!FLAG_IS_DEFAULT(MaxNewSize)) { |
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321 uintx min_new_size = MAX2(_gen_alignment, _min_gen0_size); |
0 | 322 |
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323 if (MaxNewSize >= MaxHeapSize) { |
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324 // Make sure there is room for an old generation |
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325 uintx smaller_max_new_size = MaxHeapSize - _gen_alignment; |
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326 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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327 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or greater than the entire " |
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328 "heap (" SIZE_FORMAT "k). A new max generation size of " SIZE_FORMAT "k will be used.", |
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329 MaxNewSize/K, MaxHeapSize/K, smaller_max_new_size/K); |
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330 } |
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331 FLAG_SET_ERGO(uintx, MaxNewSize, smaller_max_new_size); |
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332 if (NewSize > MaxNewSize) { |
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333 FLAG_SET_ERGO(uintx, NewSize, MaxNewSize); |
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334 _initial_gen0_size = NewSize; |
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335 } |
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336 } else if (MaxNewSize < min_new_size) { |
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337 FLAG_SET_ERGO(uintx, MaxNewSize, min_new_size); |
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338 } else if (!is_size_aligned(MaxNewSize, _gen_alignment)) { |
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339 FLAG_SET_ERGO(uintx, MaxNewSize, align_size_down(MaxNewSize, _gen_alignment)); |
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340 } |
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341 _max_gen0_size = MaxNewSize; |
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342 } |
0 | 343 |
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344 if (NewSize > MaxNewSize) { |
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345 // At this point this should only happen if the user specifies a large NewSize and/or |
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346 // a small (but not too small) MaxNewSize. |
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347 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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348 warning("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). " |
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349 "A new max generation size of " SIZE_FORMAT "k will be used.", |
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350 NewSize/K, MaxNewSize/K, NewSize/K); |
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351 } |
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352 FLAG_SET_ERGO(uintx, MaxNewSize, NewSize); |
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353 _max_gen0_size = MaxNewSize; |
0 | 354 } |
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355 |
0 | 356 if (SurvivorRatio < 1 || NewRatio < 1) { |
12831 | 357 vm_exit_during_initialization("Invalid young gen ratio specified"); |
0 | 358 } |
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359 |
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360 DEBUG_ONLY(GenCollectorPolicy::assert_flags();) |
0 | 361 } |
362 | |
363 void TwoGenerationCollectorPolicy::initialize_flags() { | |
364 GenCollectorPolicy::initialize_flags(); | |
365 | |
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366 if (!is_size_aligned(OldSize, _gen_alignment)) { |
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367 FLAG_SET_ERGO(uintx, OldSize, align_size_down(OldSize, _gen_alignment)); |
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368 } |
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369 |
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370 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(MaxHeapSize)) { |
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371 // NewRatio will be used later to set the young generation size so we use |
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372 // it to calculate how big the heap should be based on the requested OldSize |
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373 // and NewRatio. |
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374 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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375 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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376 |
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377 calculated_heapsize = align_size_up(calculated_heapsize, _heap_alignment); |
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378 FLAG_SET_ERGO(uintx, MaxHeapSize, calculated_heapsize); |
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379 _max_heap_byte_size = MaxHeapSize; |
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380 FLAG_SET_ERGO(uintx, InitialHeapSize, calculated_heapsize); |
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381 _initial_heap_byte_size = InitialHeapSize; |
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382 } |
0 | 383 |
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384 // adjust max heap size if necessary |
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385 if (NewSize + OldSize > MaxHeapSize) { |
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386 if (_max_heap_size_cmdline) { |
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387 // somebody set a maximum heap size with the intention that we should not |
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388 // exceed it. Adjust New/OldSize as necessary. |
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389 uintx calculated_size = NewSize + OldSize; |
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390 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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391 uintx smaller_new_size = align_size_down((uintx)(NewSize * shrink_factor), _gen_alignment); |
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392 FLAG_SET_ERGO(uintx, NewSize, MAX2(young_gen_size_lower_bound(), smaller_new_size)); |
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393 _initial_gen0_size = NewSize; |
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394 |
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395 // OldSize is already aligned because above we aligned MaxHeapSize to |
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396 // _heap_alignment, and we just made sure that NewSize is aligned to |
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397 // _gen_alignment. In initialize_flags() we verified that _heap_alignment |
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398 // is a multiple of _gen_alignment. |
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399 FLAG_SET_ERGO(uintx, OldSize, MaxHeapSize - NewSize); |
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400 } else { |
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401 FLAG_SET_ERGO(uintx, MaxHeapSize, align_size_up(NewSize + OldSize, _heap_alignment)); |
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402 _max_heap_byte_size = MaxHeapSize; |
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403 } |
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404 } |
10284 | 405 |
0 | 406 always_do_update_barrier = UseConcMarkSweepGC; |
407 | |
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408 DEBUG_ONLY(TwoGenerationCollectorPolicy::assert_flags();) |
0 | 409 } |
410 | |
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411 // Values set on the command line win over any ergonomically |
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412 // set command line parameters. |
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413 // Ergonomic choice of parameters are done before this |
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414 // method is called. Values for command line parameters such as NewSize |
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415 // and MaxNewSize feed those ergonomic choices into this method. |
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416 // This method makes the final generation sizings consistent with |
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417 // themselves and with overall heap sizings. |
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418 // In the absence of explicitly set command line flags, policies |
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419 // such as the use of NewRatio are used to size the generation. |
0 | 420 void GenCollectorPolicy::initialize_size_info() { |
421 CollectorPolicy::initialize_size_info(); | |
422 | |
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423 // _space_alignment is used for alignment within a generation. |
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424 // There is additional alignment done down stream for some |
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425 // collectors that sometimes causes unwanted rounding up of |
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426 // generations sizes. |
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427 |
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428 // Determine maximum size of gen0 |
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429 |
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430 size_t max_new_size = 0; |
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431 if (!FLAG_IS_DEFAULT(MaxNewSize)) { |
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432 max_new_size = MaxNewSize; |
0 | 433 } else { |
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434 max_new_size = scale_by_NewRatio_aligned(_max_heap_byte_size); |
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435 // Bound the maximum size by NewSize below (since it historically |
0 | 436 // would have been NewSize and because the NewRatio calculation could |
437 // yield a size that is too small) and bound it by MaxNewSize above. | |
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438 // Ergonomics plays here by previously calculating the desired |
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439 // NewSize and MaxNewSize. |
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440 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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441 } |
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442 assert(max_new_size > 0, "All paths should set max_new_size"); |
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443 |
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444 // Given the maximum gen0 size, determine the initial and |
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445 // minimum gen0 sizes. |
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446 |
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447 if (_max_heap_byte_size == _min_heap_byte_size) { |
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448 // The maximum and minimum heap sizes are the same so |
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449 // the generations minimum and initial must be the |
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450 // same as its maximum. |
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451 _min_gen0_size = max_new_size; |
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452 _initial_gen0_size = max_new_size; |
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453 _max_gen0_size = max_new_size; |
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454 } else { |
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455 size_t desired_new_size = 0; |
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456 if (FLAG_IS_CMDLINE(NewSize)) { |
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457 // If NewSize is set on the command line, we must use it as |
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458 // the initial size and it also makes sense to use it as the |
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459 // lower limit. |
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460 _min_gen0_size = NewSize; |
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461 desired_new_size = NewSize; |
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462 max_new_size = MAX2(max_new_size, NewSize); |
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463 } else if (FLAG_IS_ERGO(NewSize)) { |
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464 // If NewSize is set ergonomically, we should use it as a lower |
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465 // limit, but use NewRatio to calculate the initial size. |
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466 _min_gen0_size = NewSize; |
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467 desired_new_size = |
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468 MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
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469 max_new_size = MAX2(max_new_size, NewSize); |
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470 } else { |
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471 // For the case where NewSize is the default, use NewRatio |
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472 // to size the minimum and initial generation sizes. |
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473 // Use the default NewSize as the floor for these values. If |
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474 // NewRatio is overly large, the resulting sizes can be too |
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475 // small. |
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476 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(_min_heap_byte_size), NewSize); |
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477 desired_new_size = |
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478 MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
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479 } |
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480 |
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481 assert(_min_gen0_size > 0, "Sanity check"); |
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482 _initial_gen0_size = desired_new_size; |
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483 _max_gen0_size = max_new_size; |
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484 |
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485 // At this point the desirable initial and minimum sizes have been |
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486 // determined without regard to the maximum sizes. |
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487 |
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488 // Bound the sizes by the corresponding overall heap sizes. |
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489 _min_gen0_size = bound_minus_alignment(_min_gen0_size, _min_heap_byte_size); |
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490 _initial_gen0_size = bound_minus_alignment(_initial_gen0_size, _initial_heap_byte_size); |
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491 _max_gen0_size = bound_minus_alignment(_max_gen0_size, _max_heap_byte_size); |
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492 |
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493 // At this point all three sizes have been checked against the |
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494 // maximum sizes but have not been checked for consistency |
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495 // among the three. |
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496 |
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497 // Final check min <= initial <= max |
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498 _min_gen0_size = MIN2(_min_gen0_size, _max_gen0_size); |
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499 _initial_gen0_size = MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size); |
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500 _min_gen0_size = MIN2(_min_gen0_size, _initial_gen0_size); |
0 | 501 } |
502 | |
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503 // Write back to flags if necessary |
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504 if (NewSize != _initial_gen0_size) { |
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505 FLAG_SET_ERGO(uintx, NewSize, _initial_gen0_size); |
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506 } |
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507 |
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508 if (MaxNewSize != _max_gen0_size) { |
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509 FLAG_SET_ERGO(uintx, MaxNewSize, _max_gen0_size); |
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510 } |
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511 |
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512 if (PrintGCDetails && Verbose) { |
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513 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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514 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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515 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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516 } |
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517 |
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518 DEBUG_ONLY(GenCollectorPolicy::assert_size_info();) |
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519 } |
0 | 520 |
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521 // Call this method during the sizing of the gen1 to make |
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522 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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523 // the most freedom in sizing because it is done before the |
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524 // policy for gen1 is applied. Once gen1 policies have been applied, |
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525 // there may be conflicts in the shape of the heap and this method |
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526 // is used to make the needed adjustments. The application of the |
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527 // policies could be more sophisticated (iterative for example) but |
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528 // keeping it simple also seems a worthwhile goal. |
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529 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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530 size_t* gen1_size_ptr, |
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531 const size_t heap_size) { |
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532 bool result = false; |
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533 |
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534 if ((*gen0_size_ptr + *gen1_size_ptr) > heap_size) { |
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535 uintx smallest_new_size = young_gen_size_lower_bound(); |
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536 if ((heap_size < (*gen0_size_ptr + _min_gen1_size)) && |
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537 (heap_size >= _min_gen1_size + smallest_new_size)) { |
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538 // Adjust gen0 down to accommodate _min_gen1_size |
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539 *gen0_size_ptr = align_size_down_bounded(heap_size - _min_gen1_size, _gen_alignment); |
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540 result = true; |
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541 } else { |
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542 *gen1_size_ptr = align_size_down_bounded(heap_size - *gen0_size_ptr, _gen_alignment); |
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543 } |
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544 } |
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545 return result; |
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546 } |
0 | 547 |
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548 // Minimum sizes of the generations may be different than |
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549 // the initial sizes. An inconsistently is permitted here |
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550 // in the total size that can be specified explicitly by |
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551 // command line specification of OldSize and NewSize and |
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552 // also a command line specification of -Xms. Issue a warning |
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553 // but allow the values to pass. |
0 | 554 |
555 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
556 GenCollectorPolicy::initialize_size_info(); | |
557 | |
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558 // At this point the minimum, initial and maximum sizes |
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559 // of the overall heap and of gen0 have been determined. |
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560 // The maximum gen1 size can be determined from the maximum gen0 |
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561 // and maximum heap size since no explicit flags exits |
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562 // for setting the gen1 maximum. |
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563 _max_gen1_size = MAX2(_max_heap_byte_size - _max_gen0_size, _gen_alignment); |
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564 |
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565 // If no explicit command line flag has been set for the |
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566 // gen1 size, use what is left for gen1. |
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567 if (!FLAG_IS_CMDLINE(OldSize)) { |
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568 // The user has not specified any value but the ergonomics |
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569 // may have chosen a value (which may or may not be consistent |
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570 // with the overall heap size). In either case make |
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571 // the minimum, maximum and initial sizes consistent |
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572 // with the gen0 sizes and the overall heap sizes. |
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573 _min_gen1_size = MAX2(_min_heap_byte_size - _min_gen0_size, _gen_alignment); |
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574 _initial_gen1_size = MAX2(_initial_heap_byte_size - _initial_gen0_size, _gen_alignment); |
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575 // _max_gen1_size has already been made consistent above |
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576 FLAG_SET_ERGO(uintx, OldSize, _initial_gen1_size); |
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577 } else { |
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578 // It's been explicitly set on the command line. Use the |
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579 // OldSize and then determine the consequences. |
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580 _min_gen1_size = MIN2(OldSize, _min_heap_byte_size - _min_gen0_size); |
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581 _initial_gen1_size = OldSize; |
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582 |
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583 // If the user has explicitly set an OldSize that is inconsistent |
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584 // with other command line flags, issue a warning. |
0 | 585 // The generation minimums and the overall heap mimimum should |
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586 // be within one generation alignment. |
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587 if ((_min_gen1_size + _min_gen0_size + _gen_alignment) < _min_heap_byte_size) { |
0 | 588 warning("Inconsistency between minimum heap size and minimum " |
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589 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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590 _min_heap_byte_size); |
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591 } |
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592 if (OldSize > _max_gen1_size) { |
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593 warning("Inconsistency between maximum heap size and maximum " |
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594 "generation sizes: using maximum heap = " SIZE_FORMAT |
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595 " -XX:OldSize flag is being ignored", |
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596 _max_heap_byte_size); |
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597 } |
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598 // If there is an inconsistency between the OldSize and the minimum and/or |
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599 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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600 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, _min_heap_byte_size)) { |
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601 if (PrintGCDetails && Verbose) { |
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602 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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603 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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604 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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605 } |
0 | 606 } |
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607 // Initial size |
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608 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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609 _initial_heap_byte_size)) { |
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610 if (PrintGCDetails && Verbose) { |
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611 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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612 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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613 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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614 } |
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615 } |
0 | 616 } |
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617 // Enforce the maximum gen1 size. |
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618 _min_gen1_size = MIN2(_min_gen1_size, _max_gen1_size); |
0 | 619 |
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620 // Check that min gen1 <= initial gen1 <= max gen1 |
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621 _initial_gen1_size = MAX2(_initial_gen1_size, _min_gen1_size); |
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622 _initial_gen1_size = MIN2(_initial_gen1_size, _max_gen1_size); |
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623 |
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624 // Write back to flags if necessary |
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625 if (NewSize != _initial_gen0_size) { |
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626 FLAG_SET_ERGO(uintx, NewSize, _initial_gen0_size); |
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627 } |
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628 |
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629 if (MaxNewSize != _max_gen0_size) { |
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630 FLAG_SET_ERGO(uintx, MaxNewSize, _max_gen0_size); |
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631 } |
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632 |
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633 if (OldSize != _initial_gen1_size) { |
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634 FLAG_SET_ERGO(uintx, OldSize, _initial_gen1_size); |
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635 } |
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636 |
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637 if (PrintGCDetails && Verbose) { |
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638 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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639 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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640 _min_gen1_size, _initial_gen1_size, _max_gen1_size); |
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641 } |
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642 |
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643 DEBUG_ONLY(TwoGenerationCollectorPolicy::assert_size_info();) |
0 | 644 } |
645 | |
646 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
647 bool is_tlab, | |
648 bool* gc_overhead_limit_was_exceeded) { | |
649 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
650 | |
651 debug_only(gch->check_for_valid_allocation_state()); | |
652 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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653 |
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654 // In general gc_overhead_limit_was_exceeded should be false so |
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655 // set it so here and reset it to true only if the gc time |
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656 // limit is being exceeded as checked below. |
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657 *gc_overhead_limit_was_exceeded = false; |
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658 |
0 | 659 HeapWord* result = NULL; |
660 | |
661 // Loop until the allocation is satisified, | |
662 // or unsatisfied after GC. | |
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663 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 664 HandleMark hm; // discard any handles allocated in each iteration |
665 | |
666 // First allocation attempt is lock-free. | |
667 Generation *gen0 = gch->get_gen(0); | |
668 assert(gen0->supports_inline_contig_alloc(), | |
669 "Otherwise, must do alloc within heap lock"); | |
670 if (gen0->should_allocate(size, is_tlab)) { | |
671 result = gen0->par_allocate(size, is_tlab); | |
672 if (result != NULL) { | |
673 assert(gch->is_in_reserved(result), "result not in heap"); | |
674 return result; | |
675 } | |
676 } | |
677 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
678 { | |
679 MutexLocker ml(Heap_lock); | |
680 if (PrintGC && Verbose) { | |
681 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
682 " attempting locked slow path allocation"); | |
683 } | |
684 // Note that only large objects get a shot at being | |
685 // allocated in later generations. | |
686 bool first_only = ! should_try_older_generation_allocation(size); | |
687 | |
688 result = gch->attempt_allocation(size, is_tlab, first_only); | |
689 if (result != NULL) { | |
690 assert(gch->is_in_reserved(result), "result not in heap"); | |
691 return result; | |
692 } | |
693 | |
694 if (GC_locker::is_active_and_needs_gc()) { | |
695 if (is_tlab) { | |
696 return NULL; // Caller will retry allocating individual object | |
697 } | |
698 if (!gch->is_maximal_no_gc()) { | |
699 // Try and expand heap to satisfy request | |
700 result = expand_heap_and_allocate(size, is_tlab); | |
701 // result could be null if we are out of space | |
702 if (result != NULL) { | |
703 return result; | |
704 } | |
705 } | |
706 | |
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707 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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708 return NULL; // we didn't get to do a GC and we didn't get any memory |
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709 } |
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710 |
0 | 711 // If this thread is not in a jni critical section, we stall |
712 // the requestor until the critical section has cleared and | |
713 // GC allowed. When the critical section clears, a GC is | |
714 // initiated by the last thread exiting the critical section; so | |
715 // we retry the allocation sequence from the beginning of the loop, | |
716 // rather than causing more, now probably unnecessary, GC attempts. | |
717 JavaThread* jthr = JavaThread::current(); | |
718 if (!jthr->in_critical()) { | |
719 MutexUnlocker mul(Heap_lock); | |
720 // Wait for JNI critical section to be exited | |
721 GC_locker::stall_until_clear(); | |
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722 gclocker_stalled_count += 1; |
0 | 723 continue; |
724 } else { | |
725 if (CheckJNICalls) { | |
726 fatal("Possible deadlock due to allocating while" | |
727 " in jni critical section"); | |
728 } | |
729 return NULL; | |
730 } | |
731 } | |
732 | |
733 // Read the gc count while the heap lock is held. | |
734 gc_count_before = Universe::heap()->total_collections(); | |
735 } | |
736 | |
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737 VM_GenCollectForAllocation op(size, is_tlab, gc_count_before); |
0 | 738 VMThread::execute(&op); |
739 if (op.prologue_succeeded()) { | |
740 result = op.result(); | |
741 if (op.gc_locked()) { | |
742 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
743 continue; // retry and/or stall as necessary | |
744 } | |
1387
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745 |
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746 // Allocation has failed and a collection |
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747 // has been done. If the gc time limit was exceeded the |
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748 // this time, return NULL so that an out-of-memory |
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749 // will be thrown. Clear gc_overhead_limit_exceeded |
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750 // so that the overhead exceeded does not persist. |
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751 |
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752 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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753 const bool softrefs_clear = all_soft_refs_clear(); |
8743
82657b6a8cc0
6976528: PS: assert(!limit_exceeded || softrefs_clear) failed: Should have been cleared
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754 |
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755 if (limit_exceeded && softrefs_clear) { |
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756 *gc_overhead_limit_was_exceeded = true; |
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757 size_policy()->set_gc_overhead_limit_exceeded(false); |
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758 if (op.result() != NULL) { |
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759 CollectedHeap::fill_with_object(op.result(), size); |
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|
760 } |
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|
761 return NULL; |
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|
762 } |
0 | 763 assert(result == NULL || gch->is_in_reserved(result), |
764 "result not in heap"); | |
765 return result; | |
766 } | |
767 | |
768 // Give a warning if we seem to be looping forever. | |
769 if ((QueuedAllocationWarningCount > 0) && | |
770 (try_count % QueuedAllocationWarningCount == 0)) { | |
771 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
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772 " size=" SIZE_FORMAT " %s", try_count, size, is_tlab ? "(TLAB)" : ""); |
0 | 773 } |
774 } | |
775 } | |
776 | |
777 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
778 bool is_tlab) { | |
779 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
780 HeapWord* result = NULL; | |
781 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
782 Generation *gen = gch->get_gen(i); | |
783 if (gen->should_allocate(size, is_tlab)) { | |
784 result = gen->expand_and_allocate(size, is_tlab); | |
785 } | |
786 } | |
787 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
788 return result; | |
789 } | |
790 | |
791 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
792 bool is_tlab) { | |
793 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
794 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
795 HeapWord* result = NULL; | |
796 | |
797 assert(size != 0, "Precondition violated"); | |
798 if (GC_locker::is_active_and_needs_gc()) { | |
799 // GC locker is active; instead of a collection we will attempt | |
800 // to expand the heap, if there's room for expansion. | |
801 if (!gch->is_maximal_no_gc()) { | |
802 result = expand_heap_and_allocate(size, is_tlab); | |
803 } | |
804 return result; // could be null if we are out of space | |
1994
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7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
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|
805 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 806 // Do an incremental collection. |
807 gch->do_collection(false /* full */, | |
808 false /* clear_all_soft_refs */, | |
809 size /* size */, | |
810 is_tlab /* is_tlab */, | |
811 number_of_generations() - 1 /* max_level */); | |
812 } else { | |
1994
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
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|
813 if (Verbose && PrintGCDetails) { |
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814 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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|
815 } |
0 | 816 // Try a full collection; see delta for bug id 6266275 |
817 // for the original code and why this has been simplified | |
818 // with from-space allocation criteria modified and | |
819 // such allocation moved out of the safepoint path. | |
820 gch->do_collection(true /* full */, | |
821 false /* clear_all_soft_refs */, | |
822 size /* size */, | |
823 is_tlab /* is_tlab */, | |
824 number_of_generations() - 1 /* max_level */); | |
825 } | |
826 | |
827 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
828 | |
829 if (result != NULL) { | |
830 assert(gch->is_in_reserved(result), "result not in heap"); | |
831 return result; | |
832 } | |
833 | |
834 // OK, collection failed, try expansion. | |
835 result = expand_heap_and_allocate(size, is_tlab); | |
836 if (result != NULL) { | |
837 return result; | |
838 } | |
839 | |
840 // If we reach this point, we're really out of memory. Try every trick | |
841 // we can to reclaim memory. Force collection of soft references. Force | |
842 // a complete compaction of the heap. Any additional methods for finding | |
843 // free memory should be here, especially if they are expensive. If this | |
844 // attempt fails, an OOM exception will be thrown. | |
845 { | |
10287
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846 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 847 |
848 gch->do_collection(true /* full */, | |
849 true /* clear_all_soft_refs */, | |
850 size /* size */, | |
851 is_tlab /* is_tlab */, | |
852 number_of_generations() - 1 /* max_level */); | |
853 } | |
854 | |
855 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
856 if (result != NULL) { | |
857 assert(gch->is_in_reserved(result), "result not in heap"); | |
858 return result; | |
859 } | |
860 | |
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861 assert(!should_clear_all_soft_refs(), |
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862 "Flag should have been handled and cleared prior to this point"); |
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863 |
0 | 864 // What else? We might try synchronous finalization later. If the total |
865 // space available is large enough for the allocation, then a more | |
866 // complete compaction phase than we've tried so far might be | |
867 // appropriate. | |
868 return NULL; | |
869 } | |
870 | |
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871 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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872 ClassLoaderData* loader_data, |
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873 size_t word_size, |
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874 Metaspace::MetadataType mdtype) { |
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875 uint loop_count = 0; |
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|
876 uint gc_count = 0; |
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877 uint full_gc_count = 0; |
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|
878 |
6923
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|
879 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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|
880 |
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881 do { |
6753
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882 MetaWord* result = NULL; |
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883 if (GC_locker::is_active_and_needs_gc()) { |
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884 // If the GC_locker is active, just expand and allocate. |
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885 // If that does not succeed, wait if this thread is not |
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886 // in a critical section itself. |
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7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
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887 result = |
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|
888 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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889 mdtype); |
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890 if (result != NULL) { |
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891 return result; |
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|
892 } |
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893 JavaThread* jthr = JavaThread::current(); |
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894 if (!jthr->in_critical()) { |
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895 // Wait for JNI critical section to be exited |
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896 GC_locker::stall_until_clear(); |
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897 // The GC invoked by the last thread leaving the critical |
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898 // section will be a young collection and a full collection |
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899 // is (currently) needed for unloading classes so continue |
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900 // to the next iteration to get a full GC. |
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901 continue; |
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902 } else { |
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|
903 if (CheckJNICalls) { |
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|
904 fatal("Possible deadlock due to allocating while" |
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|
905 " in jni critical section"); |
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|
906 } |
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907 return NULL; |
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|
908 } |
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|
909 } |
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|
910 |
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911 { // Need lock to get self consistent gc_count's |
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|
912 MutexLocker ml(Heap_lock); |
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913 gc_count = Universe::heap()->total_collections(); |
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914 full_gc_count = Universe::heap()->total_full_collections(); |
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915 } |
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916 |
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917 // Generate a VM operation |
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918 VM_CollectForMetadataAllocation op(loader_data, |
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919 word_size, |
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920 mdtype, |
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921 gc_count, |
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922 full_gc_count, |
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923 GCCause::_metadata_GC_threshold); |
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924 VMThread::execute(&op); |
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925 |
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926 // If GC was locked out, try again. Check |
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927 // before checking success because the prologue |
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928 // could have succeeded and the GC still have |
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929 // been locked out. |
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930 if (op.gc_locked()) { |
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931 continue; |
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932 } |
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933 |
6725
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934 if (op.prologue_succeeded()) { |
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935 return op.result(); |
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936 } |
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937 loop_count++; |
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938 if ((QueuedAllocationWarningCount > 0) && |
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939 (loop_count % QueuedAllocationWarningCount == 0)) { |
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940 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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941 " size=" SIZE_FORMAT, loop_count, word_size); |
6725
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942 } |
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943 } while (true); // Until a GC is done |
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944 } |
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945 |
0 | 946 // Return true if any of the following is true: |
947 // . the allocation won't fit into the current young gen heap | |
948 // . gc locker is occupied (jni critical section) | |
949 // . heap memory is tight -- the most recent previous collection | |
950 // was a full collection because a partial collection (would | |
951 // have) failed and is likely to fail again | |
952 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
953 size_t word_size) const { | |
954 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
955 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
956 return (word_size > heap_word_size(gen0_capacity)) | |
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957 || GC_locker::is_active_and_needs_gc() |
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958 || gch->incremental_collection_failed(); |
0 | 959 } |
960 | |
961 | |
962 // | |
963 // MarkSweepPolicy methods | |
964 // | |
965 | |
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966 void MarkSweepPolicy::initialize_alignments() { |
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967 _space_alignment = _gen_alignment = (uintx)Generation::GenGrain; |
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968 _heap_alignment = compute_heap_alignment(); |
0 | 969 } |
970 | |
971 void MarkSweepPolicy::initialize_generations() { | |
20360 | 972 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, CURRENT_PC, |
973 AllocFailStrategy::RETURN_NULL); | |
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974 if (_generations == NULL) { |
0 | 975 vm_exit_during_initialization("Unable to allocate gen spec"); |
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976 } |
0 | 977 |
7451
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978 if (UseParNewGC) { |
0 | 979 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
980 } else { | |
981 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
982 } | |
983 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
984 | |
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985 if (_generations[0] == NULL || _generations[1] == NULL) { |
0 | 986 vm_exit_during_initialization("Unable to allocate gen spec"); |
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987 } |
0 | 988 } |
989 | |
990 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
991 // initialize the policy counters - 2 collectors, 3 generations | |
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992 if (UseParNewGC) { |
0 | 993 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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994 } else { |
0 | 995 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
996 } | |
997 } | |
17898
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998 |
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999 /////////////// Unit tests /////////////// |
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1000 |
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1001 #ifndef PRODUCT |
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1002 // Testing that the NewSize flag is handled correct is hard because it |
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1003 // depends on so many other configurable variables. This test only tries to |
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1004 // verify that there are some basic rules for NewSize honored by the policies. |
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1005 class TestGenCollectorPolicy { |
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1006 public: |
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1007 static void test() { |
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1008 size_t flag_value; |
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1009 |
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1010 save_flags(); |
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1011 |
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1012 // Set some limits that makes the math simple. |
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1013 FLAG_SET_ERGO(uintx, MaxHeapSize, 180 * M); |
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1014 FLAG_SET_ERGO(uintx, InitialHeapSize, 120 * M); |
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1015 Arguments::set_min_heap_size(40 * M); |
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1016 |
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1017 // If NewSize is set on the command line, it should be used |
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1018 // for both min and initial young size if less than min heap. |
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1019 flag_value = 20 * M; |
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1020 FLAG_SET_CMDLINE(uintx, NewSize, flag_value); |
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1021 verify_min(flag_value); |
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1022 verify_initial(flag_value); |
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1023 |
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1024 // If NewSize is set on command line, but is larger than the min |
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1025 // heap size, it should only be used for initial young size. |
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1026 flag_value = 80 * M; |
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1027 FLAG_SET_CMDLINE(uintx, NewSize, flag_value); |
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1028 verify_initial(flag_value); |
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1029 |
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1030 // If NewSize has been ergonomically set, the collector policy |
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1031 // should use it for min but calculate the initial young size |
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1032 // using NewRatio. |
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1033 flag_value = 20 * M; |
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1034 FLAG_SET_ERGO(uintx, NewSize, flag_value); |
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1035 verify_min(flag_value); |
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1036 verify_scaled_initial(InitialHeapSize); |
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1037 |
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1038 restore_flags(); |
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1039 |
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1040 } |
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1041 |
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1042 static void verify_min(size_t expected) { |
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1043 MarkSweepPolicy msp; |
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1044 msp.initialize_all(); |
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1045 |
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1046 assert(msp.min_gen0_size() <= expected, err_msg("%zu > %zu", msp.min_gen0_size(), expected)); |
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1047 } |
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1048 |
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1049 static void verify_initial(size_t expected) { |
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1050 MarkSweepPolicy msp; |
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1051 msp.initialize_all(); |
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1052 |
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1053 assert(msp.initial_gen0_size() == expected, err_msg("%zu != %zu", msp.initial_gen0_size(), expected)); |
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1054 } |
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1055 |
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1056 static void verify_scaled_initial(size_t initial_heap_size) { |
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1057 MarkSweepPolicy msp; |
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1058 msp.initialize_all(); |
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1059 |
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1060 size_t expected = msp.scale_by_NewRatio_aligned(initial_heap_size); |
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1061 assert(msp.initial_gen0_size() == expected, err_msg("%zu != %zu", msp.initial_gen0_size(), expected)); |
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1062 assert(FLAG_IS_ERGO(NewSize) && NewSize == expected, |
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1063 err_msg("NewSize should have been set ergonomically to %zu, but was %zu", expected, NewSize)); |
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1064 } |
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1065 |
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1066 private: |
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1067 static size_t original_InitialHeapSize; |
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1068 static size_t original_MaxHeapSize; |
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1069 static size_t original_MaxNewSize; |
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1070 static size_t original_MinHeapDeltaBytes; |
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1071 static size_t original_NewSize; |
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1072 static size_t original_OldSize; |
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1073 |
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1074 static void save_flags() { |
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1075 original_InitialHeapSize = InitialHeapSize; |
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1076 original_MaxHeapSize = MaxHeapSize; |
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1077 original_MaxNewSize = MaxNewSize; |
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1078 original_MinHeapDeltaBytes = MinHeapDeltaBytes; |
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1079 original_NewSize = NewSize; |
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1080 original_OldSize = OldSize; |
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1081 } |
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1082 |
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1083 static void restore_flags() { |
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1084 InitialHeapSize = original_InitialHeapSize; |
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1085 MaxHeapSize = original_MaxHeapSize; |
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1086 MaxNewSize = original_MaxNewSize; |
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1087 MinHeapDeltaBytes = original_MinHeapDeltaBytes; |
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1088 NewSize = original_NewSize; |
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1089 OldSize = original_OldSize; |
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1090 } |
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1091 }; |
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1092 |
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1093 size_t TestGenCollectorPolicy::original_InitialHeapSize = 0; |
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1094 size_t TestGenCollectorPolicy::original_MaxHeapSize = 0; |
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1095 size_t TestGenCollectorPolicy::original_MaxNewSize = 0; |
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1096 size_t TestGenCollectorPolicy::original_MinHeapDeltaBytes = 0; |
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1097 size_t TestGenCollectorPolicy::original_NewSize = 0; |
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1098 size_t TestGenCollectorPolicy::original_OldSize = 0; |
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1099 |
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1100 void TestNewSize_test() { |
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1101 TestGenCollectorPolicy::test(); |
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1102 } |
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1103 |
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1104 #endif |