Mercurial > hg > graal-compiler
annotate src/share/vm/memory/collectorPolicy.cpp @ 14495:cd5d10655495
8027754: Enable loop optimizations for loops with MathExact inside
Reviewed-by: kvn, iveresov
author | rbackman |
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date | Thu, 23 Jan 2014 12:08:28 +0100 |
parents | f7f0c6a77d6d |
children | bac9ef65b71d 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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 |
14309 | 48 // CollectorPolicy methods |
0 | 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 size_t alignment = GenRemSet::max_alignment_constraint(); |
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182 |
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183 // Parallel GC does its own alignment of the generations to avoid requiring a |
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184 // large page (256M on some platforms) for the permanent generation. The |
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185 // other collectors should also be updated to do their own alignment and then |
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186 // this use of lcm() should be removed. |
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187 if (UseLargePages && !UseParallelGC) { |
14309 | 188 // In presence of large pages we have to make sure that our |
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189 // alignment is large page aware |
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190 alignment = lcm(os::large_page_size(), alignment); |
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191 } |
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192 |
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193 return alignment; |
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194 } |
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195 |
14309 | 196 // GenCollectorPolicy methods |
0 | 197 |
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198 GenCollectorPolicy::GenCollectorPolicy() : |
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199 _min_gen0_size(0), |
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200 _initial_gen0_size(0), |
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201 _max_gen0_size(0), |
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202 _gen_alignment(0), |
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203 _generations(NULL) |
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204 {} |
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205 |
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206 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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207 return align_size_down_bounded(base_size / (NewRatio + 1), _gen_alignment); |
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208 } |
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209 |
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210 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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211 size_t maximum_size) { |
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212 size_t max_minus = maximum_size - _gen_alignment; |
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213 return desired_size < max_minus ? desired_size : max_minus; |
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214 } |
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215 |
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216 |
0 | 217 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
218 size_t init_promo_size, | |
219 size_t init_survivor_size) { | |
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220 const double max_gc_pause_sec = ((double) MaxGCPauseMillis) / 1000.0; |
0 | 221 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
222 init_promo_size, | |
223 init_survivor_size, | |
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224 max_gc_pause_sec, |
0 | 225 GCTimeRatio); |
226 } | |
227 | |
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228 size_t GenCollectorPolicy::young_gen_size_lower_bound() { |
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229 // The young generation must be aligned and have room for eden + two survivors |
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230 return align_size_up(3 * _space_alignment, _gen_alignment); |
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231 } |
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232 |
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233 #ifdef ASSERT |
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234 void GenCollectorPolicy::assert_flags() { |
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235 CollectorPolicy::assert_flags(); |
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236 assert(NewSize >= _min_gen0_size, "Ergonomics decided on a too small young gen size"); |
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237 assert(NewSize <= MaxNewSize, "Ergonomics decided on incompatible initial and maximum young gen sizes"); |
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238 assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young gen and heap sizes"); |
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239 assert(NewSize % _gen_alignment == 0, "NewSize alignment"); |
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240 assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize % _gen_alignment == 0, "MaxNewSize alignment"); |
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241 } |
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242 |
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243 void TwoGenerationCollectorPolicy::assert_flags() { |
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244 GenCollectorPolicy::assert_flags(); |
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245 assert(OldSize + NewSize <= MaxHeapSize, "Ergonomics decided on incompatible generation and heap sizes"); |
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246 assert(OldSize % _gen_alignment == 0, "OldSize alignment"); |
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247 } |
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248 |
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249 void GenCollectorPolicy::assert_size_info() { |
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250 CollectorPolicy::assert_size_info(); |
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251 // GenCollectorPolicy::initialize_size_info may update the MaxNewSize |
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252 assert(MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young and heap sizes"); |
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253 assert(NewSize == _initial_gen0_size, "Discrepancy between NewSize flag and local storage"); |
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254 assert(MaxNewSize == _max_gen0_size, "Discrepancy between MaxNewSize flag and local storage"); |
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255 assert(_min_gen0_size <= _initial_gen0_size, "Ergonomics decided on incompatible minimum and initial young gen sizes"); |
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256 assert(_initial_gen0_size <= _max_gen0_size, "Ergonomics decided on incompatible initial and maximum young gen sizes"); |
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257 assert(_min_gen0_size % _gen_alignment == 0, "_min_gen0_size alignment"); |
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258 assert(_initial_gen0_size % _gen_alignment == 0, "_initial_gen0_size alignment"); |
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259 assert(_max_gen0_size % _gen_alignment == 0, "_max_gen0_size alignment"); |
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260 } |
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261 |
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262 void TwoGenerationCollectorPolicy::assert_size_info() { |
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263 GenCollectorPolicy::assert_size_info(); |
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264 assert(OldSize == _initial_gen1_size, "Discrepancy between OldSize flag and local storage"); |
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265 assert(_min_gen1_size <= _initial_gen1_size, "Ergonomics decided on incompatible minimum and initial old gen sizes"); |
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266 assert(_initial_gen1_size <= _max_gen1_size, "Ergonomics decided on incompatible initial and maximum old gen sizes"); |
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267 assert(_max_gen1_size % _gen_alignment == 0, "_max_gen1_size alignment"); |
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268 assert(_initial_gen1_size % _gen_alignment == 0, "_initial_gen1_size alignment"); |
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269 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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270 } |
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271 #endif // ASSERT |
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272 |
0 | 273 void GenCollectorPolicy::initialize_flags() { |
274 CollectorPolicy::initialize_flags(); | |
275 | |
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276 assert(_gen_alignment != 0, "Generation alignment not set up properly"); |
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277 assert(_heap_alignment >= _gen_alignment, |
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278 err_msg("heap_alignment: " SIZE_FORMAT " less than gen_alignment: " SIZE_FORMAT, |
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279 _heap_alignment, _gen_alignment)); |
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280 assert(_gen_alignment % _space_alignment == 0, |
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281 err_msg("gen_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT, |
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282 _gen_alignment, _space_alignment)); |
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283 assert(_heap_alignment % _gen_alignment == 0, |
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284 err_msg("heap_alignment: " SIZE_FORMAT " not aligned by gen_alignment: " SIZE_FORMAT, |
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285 _heap_alignment, _gen_alignment)); |
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286 |
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287 // All generational heaps have a youngest gen; handle those flags here |
0 | 288 |
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289 // Make sure the heap is large enough for two generations |
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290 uintx smallest_new_size = young_gen_size_lower_bound(); |
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291 uintx smallest_heap_size = align_size_up(smallest_new_size + align_size_up(_space_alignment, _gen_alignment), |
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292 _heap_alignment); |
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293 if (MaxHeapSize < smallest_heap_size) { |
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294 FLAG_SET_ERGO(uintx, MaxHeapSize, smallest_heap_size); |
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295 _max_heap_byte_size = MaxHeapSize; |
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296 } |
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297 // If needed, synchronize _min_heap_byte size and _initial_heap_byte_size |
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298 if (_min_heap_byte_size < smallest_heap_size) { |
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299 _min_heap_byte_size = smallest_heap_size; |
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300 if (InitialHeapSize < _min_heap_byte_size) { |
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301 FLAG_SET_ERGO(uintx, InitialHeapSize, smallest_heap_size); |
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302 _initial_heap_byte_size = smallest_heap_size; |
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303 } |
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304 } |
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305 |
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306 // Now take the actual NewSize into account. We will silently increase NewSize |
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307 // if the user specified a smaller value. |
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308 smallest_new_size = MAX2(smallest_new_size, (uintx)align_size_down(NewSize, _gen_alignment)); |
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309 if (smallest_new_size != NewSize) { |
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310 FLAG_SET_ERGO(uintx, NewSize, smallest_new_size); |
0 | 311 } |
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312 _initial_gen0_size = NewSize; |
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313 |
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314 if (!FLAG_IS_DEFAULT(MaxNewSize)) { |
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315 uintx min_new_size = MAX2(_gen_alignment, _min_gen0_size); |
0 | 316 |
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317 if (MaxNewSize >= MaxHeapSize) { |
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318 // Make sure there is room for an old generation |
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319 uintx smaller_max_new_size = MaxHeapSize - _gen_alignment; |
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320 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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321 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or greater than the entire " |
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322 "heap (" SIZE_FORMAT "k). A new max generation size of " SIZE_FORMAT "k will be used.", |
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323 MaxNewSize/K, MaxHeapSize/K, smaller_max_new_size/K); |
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324 } |
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325 FLAG_SET_ERGO(uintx, MaxNewSize, smaller_max_new_size); |
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326 if (NewSize > MaxNewSize) { |
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327 FLAG_SET_ERGO(uintx, NewSize, MaxNewSize); |
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328 _initial_gen0_size = NewSize; |
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329 } |
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330 } else if (MaxNewSize < min_new_size) { |
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331 FLAG_SET_ERGO(uintx, MaxNewSize, min_new_size); |
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332 } else if (!is_size_aligned(MaxNewSize, _gen_alignment)) { |
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333 FLAG_SET_ERGO(uintx, MaxNewSize, align_size_down(MaxNewSize, _gen_alignment)); |
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334 } |
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335 _max_gen0_size = MaxNewSize; |
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336 } |
0 | 337 |
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338 if (NewSize > MaxNewSize) { |
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339 // At this point this should only happen if the user specifies a large NewSize and/or |
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340 // a small (but not too small) MaxNewSize. |
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341 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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342 warning("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). " |
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343 "A new max generation size of " SIZE_FORMAT "k will be used.", |
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344 NewSize/K, MaxNewSize/K, NewSize/K); |
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345 } |
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346 FLAG_SET_ERGO(uintx, MaxNewSize, NewSize); |
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347 _max_gen0_size = MaxNewSize; |
0 | 348 } |
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349 |
0 | 350 if (SurvivorRatio < 1 || NewRatio < 1) { |
12831 | 351 vm_exit_during_initialization("Invalid young gen ratio specified"); |
0 | 352 } |
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353 |
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354 DEBUG_ONLY(GenCollectorPolicy::assert_flags();) |
0 | 355 } |
356 | |
357 void TwoGenerationCollectorPolicy::initialize_flags() { | |
358 GenCollectorPolicy::initialize_flags(); | |
359 | |
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360 if (!is_size_aligned(OldSize, _gen_alignment)) { |
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361 FLAG_SET_ERGO(uintx, OldSize, align_size_down(OldSize, _gen_alignment)); |
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362 } |
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363 |
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364 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(MaxHeapSize)) { |
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365 // NewRatio will be used later to set the young generation size so we use |
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366 // it to calculate how big the heap should be based on the requested OldSize |
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367 // and NewRatio. |
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368 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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369 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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370 |
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371 calculated_heapsize = align_size_up(calculated_heapsize, _heap_alignment); |
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372 FLAG_SET_ERGO(uintx, MaxHeapSize, calculated_heapsize); |
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373 _max_heap_byte_size = MaxHeapSize; |
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374 FLAG_SET_ERGO(uintx, InitialHeapSize, calculated_heapsize); |
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375 _initial_heap_byte_size = InitialHeapSize; |
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376 } |
0 | 377 |
14309 | 378 // Adjust NewSize and OldSize or MaxHeapSize to match each other |
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379 if (NewSize + OldSize > MaxHeapSize) { |
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380 if (_max_heap_size_cmdline) { |
14309 | 381 // Somebody has set a maximum heap size with the intention that we should not |
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382 // exceed it. Adjust New/OldSize as necessary. |
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383 uintx calculated_size = NewSize + OldSize; |
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384 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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385 uintx smaller_new_size = align_size_down((uintx)(NewSize * shrink_factor), _gen_alignment); |
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386 FLAG_SET_ERGO(uintx, NewSize, MAX2(young_gen_size_lower_bound(), smaller_new_size)); |
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387 _initial_gen0_size = NewSize; |
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388 |
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389 // OldSize is already aligned because above we aligned MaxHeapSize to |
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390 // _heap_alignment, and we just made sure that NewSize is aligned to |
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391 // _gen_alignment. In initialize_flags() we verified that _heap_alignment |
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392 // is a multiple of _gen_alignment. |
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393 FLAG_SET_ERGO(uintx, OldSize, MaxHeapSize - NewSize); |
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394 } else { |
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395 FLAG_SET_ERGO(uintx, MaxHeapSize, align_size_up(NewSize + OldSize, _heap_alignment)); |
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396 _max_heap_byte_size = MaxHeapSize; |
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397 } |
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398 } |
10284 | 399 |
0 | 400 always_do_update_barrier = UseConcMarkSweepGC; |
401 | |
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402 DEBUG_ONLY(TwoGenerationCollectorPolicy::assert_flags();) |
0 | 403 } |
404 | |
13
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405 // Values set on the command line win over any ergonomically |
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406 // set command line parameters. |
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407 // Ergonomic choice of parameters are done before this |
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408 // method is called. Values for command line parameters such as NewSize |
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409 // and MaxNewSize feed those ergonomic choices into this method. |
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410 // This method makes the final generation sizings consistent with |
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411 // themselves and with overall heap sizings. |
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412 // In the absence of explicitly set command line flags, policies |
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413 // such as the use of NewRatio are used to size the generation. |
0 | 414 void GenCollectorPolicy::initialize_size_info() { |
415 CollectorPolicy::initialize_size_info(); | |
416 | |
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417 // _space_alignment is used for alignment within a generation. |
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418 // There is additional alignment done down stream for some |
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419 // collectors that sometimes causes unwanted rounding up of |
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420 // generations sizes. |
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421 |
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422 // Determine maximum size of gen0 |
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423 |
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424 size_t max_new_size = 0; |
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425 if (!FLAG_IS_DEFAULT(MaxNewSize)) { |
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426 max_new_size = MaxNewSize; |
0 | 427 } else { |
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428 max_new_size = scale_by_NewRatio_aligned(_max_heap_byte_size); |
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429 // Bound the maximum size by NewSize below (since it historically |
0 | 430 // would have been NewSize and because the NewRatio calculation could |
431 // yield a size that is too small) and bound it by MaxNewSize above. | |
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432 // Ergonomics plays here by previously calculating the desired |
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433 // NewSize and MaxNewSize. |
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434 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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435 } |
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436 assert(max_new_size > 0, "All paths should set max_new_size"); |
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437 |
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438 // Given the maximum gen0 size, determine the initial and |
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439 // minimum gen0 sizes. |
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440 |
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441 if (_max_heap_byte_size == _min_heap_byte_size) { |
14309 | 442 // The maximum and minimum heap sizes are the same so the generations |
443 // minimum and initial must be the same as its maximum. | |
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444 _min_gen0_size = max_new_size; |
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445 _initial_gen0_size = max_new_size; |
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446 _max_gen0_size = max_new_size; |
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447 } else { |
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448 size_t desired_new_size = 0; |
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449 if (FLAG_IS_CMDLINE(NewSize)) { |
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450 // If NewSize is set on the command line, we must use it as |
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451 // the initial size and it also makes sense to use it as the |
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452 // lower limit. |
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453 _min_gen0_size = NewSize; |
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454 desired_new_size = NewSize; |
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455 max_new_size = MAX2(max_new_size, NewSize); |
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456 } else if (FLAG_IS_ERGO(NewSize)) { |
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457 // If NewSize is set ergonomically, we should use it as a lower |
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458 // limit, but use NewRatio to calculate the initial size. |
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459 _min_gen0_size = NewSize; |
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460 desired_new_size = |
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461 MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
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462 max_new_size = MAX2(max_new_size, NewSize); |
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463 } else { |
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464 // For the case where NewSize is the default, use NewRatio |
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465 // to size the minimum and initial generation sizes. |
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466 // Use the default NewSize as the floor for these values. If |
14309 | 467 // NewRatio is overly large, the resulting sizes can be too small. |
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468 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(_min_heap_byte_size), NewSize); |
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469 desired_new_size = |
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470 MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
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471 } |
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472 |
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473 assert(_min_gen0_size > 0, "Sanity check"); |
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474 _initial_gen0_size = desired_new_size; |
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475 _max_gen0_size = max_new_size; |
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476 |
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477 // At this point the desirable initial and minimum sizes have been |
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478 // determined without regard to the maximum sizes. |
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479 |
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480 // Bound the sizes by the corresponding overall heap sizes. |
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481 _min_gen0_size = bound_minus_alignment(_min_gen0_size, _min_heap_byte_size); |
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482 _initial_gen0_size = bound_minus_alignment(_initial_gen0_size, _initial_heap_byte_size); |
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483 _max_gen0_size = bound_minus_alignment(_max_gen0_size, _max_heap_byte_size); |
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484 |
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485 // At this point all three sizes have been checked against the |
14309 | 486 // maximum sizes but have not been checked for consistency among the three. |
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487 |
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488 // Final check min <= initial <= max |
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489 _min_gen0_size = MIN2(_min_gen0_size, _max_gen0_size); |
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490 _initial_gen0_size = MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size); |
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491 _min_gen0_size = MIN2(_min_gen0_size, _initial_gen0_size); |
0 | 492 } |
493 | |
14309 | 494 // Write back to flags if necessary. |
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495 if (NewSize != _initial_gen0_size) { |
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496 FLAG_SET_ERGO(uintx, NewSize, _initial_gen0_size); |
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497 } |
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498 |
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499 if (MaxNewSize != _max_gen0_size) { |
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500 FLAG_SET_ERGO(uintx, MaxNewSize, _max_gen0_size); |
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501 } |
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502 |
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503 if (PrintGCDetails && Verbose) { |
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504 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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505 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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506 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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507 } |
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508 |
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509 DEBUG_ONLY(GenCollectorPolicy::assert_size_info();) |
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510 } |
0 | 511 |
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512 // Call this method during the sizing of the gen1 to make |
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513 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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514 // the most freedom in sizing because it is done before the |
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515 // policy for gen1 is applied. Once gen1 policies have been applied, |
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516 // there may be conflicts in the shape of the heap and this method |
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517 // is used to make the needed adjustments. The application of the |
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518 // policies could be more sophisticated (iterative for example) but |
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519 // keeping it simple also seems a worthwhile goal. |
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520 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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521 size_t* gen1_size_ptr, |
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522 const size_t heap_size) { |
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523 bool result = false; |
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524 |
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525 if ((*gen0_size_ptr + *gen1_size_ptr) > heap_size) { |
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526 uintx smallest_new_size = young_gen_size_lower_bound(); |
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527 if ((heap_size < (*gen0_size_ptr + _min_gen1_size)) && |
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528 (heap_size >= _min_gen1_size + smallest_new_size)) { |
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529 // Adjust gen0 down to accommodate _min_gen1_size |
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530 *gen0_size_ptr = align_size_down_bounded(heap_size - _min_gen1_size, _gen_alignment); |
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531 result = true; |
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532 } else { |
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533 *gen1_size_ptr = align_size_down_bounded(heap_size - *gen0_size_ptr, _gen_alignment); |
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534 } |
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535 } |
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536 return result; |
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537 } |
0 | 538 |
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539 // Minimum sizes of the generations may be different than |
14309 | 540 // the initial sizes. An inconsistency is permitted here |
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541 // in the total size that can be specified explicitly by |
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542 // command line specification of OldSize and NewSize and |
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543 // also a command line specification of -Xms. Issue a warning |
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544 // but allow the values to pass. |
0 | 545 |
546 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
547 GenCollectorPolicy::initialize_size_info(); | |
548 | |
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549 // At this point the minimum, initial and maximum sizes |
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550 // of the overall heap and of gen0 have been determined. |
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551 // The maximum gen1 size can be determined from the maximum gen0 |
14309 | 552 // and maximum heap size since no explicit flags exist |
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553 // for setting the gen1 maximum. |
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554 _max_gen1_size = MAX2(_max_heap_byte_size - _max_gen0_size, _gen_alignment); |
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555 |
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556 // If no explicit command line flag has been set for the |
14309 | 557 // gen1 size, use what is left for gen1 |
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558 if (!FLAG_IS_CMDLINE(OldSize)) { |
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559 // The user has not specified any value but the ergonomics |
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560 // may have chosen a value (which may or may not be consistent |
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561 // with the overall heap size). In either case make |
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562 // the minimum, maximum and initial sizes consistent |
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563 // with the gen0 sizes and the overall heap sizes. |
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564 _min_gen1_size = MAX2(_min_heap_byte_size - _min_gen0_size, _gen_alignment); |
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565 _initial_gen1_size = MAX2(_initial_heap_byte_size - _initial_gen0_size, _gen_alignment); |
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566 // _max_gen1_size has already been made consistent above |
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567 FLAG_SET_ERGO(uintx, OldSize, _initial_gen1_size); |
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568 } else { |
14309 | 569 // OldSize has been explicitly set on the command line. Use the |
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570 // OldSize and then determine the consequences. |
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571 _min_gen1_size = MIN2(OldSize, _min_heap_byte_size - _min_gen0_size); |
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572 _initial_gen1_size = OldSize; |
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573 |
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574 // If the user has explicitly set an OldSize that is inconsistent |
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575 // with other command line flags, issue a warning. |
14309 | 576 // The generation minimums and the overall heap minimum should |
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577 // be within one generation alignment. |
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578 if ((_min_gen1_size + _min_gen0_size + _gen_alignment) < _min_heap_byte_size) { |
0 | 579 warning("Inconsistency between minimum heap size and minimum " |
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580 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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581 _min_heap_byte_size); |
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582 } |
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583 if (OldSize > _max_gen1_size) { |
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584 warning("Inconsistency between maximum heap size and maximum " |
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585 "generation sizes: using maximum heap = " SIZE_FORMAT |
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586 " -XX:OldSize flag is being ignored", |
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587 _max_heap_byte_size); |
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588 } |
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589 // If there is an inconsistency between the OldSize and the minimum and/or |
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590 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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591 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, _min_heap_byte_size)) { |
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592 if (PrintGCDetails && Verbose) { |
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593 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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594 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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595 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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596 } |
0 | 597 } |
14309 | 598 // The same as above for the old gen initial size. |
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599 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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600 _initial_heap_byte_size)) { |
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601 if (PrintGCDetails && Verbose) { |
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602 gclog_or_tty->print_cr("3: 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 } |
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606 } |
0 | 607 } |
14309 | 608 |
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609 _min_gen1_size = MIN2(_min_gen1_size, _max_gen1_size); |
0 | 610 |
14309 | 611 // Make sure that min gen1 <= initial gen1 <= max gen1. |
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612 _initial_gen1_size = MAX2(_initial_gen1_size, _min_gen1_size); |
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613 _initial_gen1_size = MIN2(_initial_gen1_size, _max_gen1_size); |
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614 |
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615 // Write back to flags if necessary |
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616 if (NewSize != _initial_gen0_size) { |
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617 FLAG_SET_ERGO(uintx, NewSize, _initial_gen0_size); |
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618 } |
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619 |
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620 if (MaxNewSize != _max_gen0_size) { |
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621 FLAG_SET_ERGO(uintx, MaxNewSize, _max_gen0_size); |
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622 } |
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623 |
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624 if (OldSize != _initial_gen1_size) { |
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625 FLAG_SET_ERGO(uintx, OldSize, _initial_gen1_size); |
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626 } |
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627 |
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628 if (PrintGCDetails && Verbose) { |
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629 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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630 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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631 _min_gen1_size, _initial_gen1_size, _max_gen1_size); |
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632 } |
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633 |
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634 DEBUG_ONLY(TwoGenerationCollectorPolicy::assert_size_info();) |
0 | 635 } |
636 | |
637 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
638 bool is_tlab, | |
639 bool* gc_overhead_limit_was_exceeded) { | |
640 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
641 | |
642 debug_only(gch->check_for_valid_allocation_state()); | |
643 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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644 |
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645 // In general gc_overhead_limit_was_exceeded should be false so |
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646 // set it so here and reset it to true only if the gc time |
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647 // limit is being exceeded as checked below. |
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648 *gc_overhead_limit_was_exceeded = false; |
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649 |
0 | 650 HeapWord* result = NULL; |
651 | |
14309 | 652 // Loop until the allocation is satisfied, or unsatisfied after GC. |
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653 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
14309 | 654 HandleMark hm; // Discard any handles allocated in each iteration. |
0 | 655 |
656 // First allocation attempt is lock-free. | |
657 Generation *gen0 = gch->get_gen(0); | |
658 assert(gen0->supports_inline_contig_alloc(), | |
659 "Otherwise, must do alloc within heap lock"); | |
660 if (gen0->should_allocate(size, is_tlab)) { | |
661 result = gen0->par_allocate(size, is_tlab); | |
662 if (result != NULL) { | |
663 assert(gch->is_in_reserved(result), "result not in heap"); | |
664 return result; | |
665 } | |
666 } | |
14309 | 667 unsigned int gc_count_before; // Read inside the Heap_lock locked region. |
0 | 668 { |
669 MutexLocker ml(Heap_lock); | |
670 if (PrintGC && Verbose) { | |
671 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
672 " attempting locked slow path allocation"); | |
673 } | |
674 // Note that only large objects get a shot at being | |
675 // allocated in later generations. | |
676 bool first_only = ! should_try_older_generation_allocation(size); | |
677 | |
678 result = gch->attempt_allocation(size, is_tlab, first_only); | |
679 if (result != NULL) { | |
680 assert(gch->is_in_reserved(result), "result not in heap"); | |
681 return result; | |
682 } | |
683 | |
684 if (GC_locker::is_active_and_needs_gc()) { | |
685 if (is_tlab) { | |
14309 | 686 return NULL; // Caller will retry allocating individual object. |
0 | 687 } |
688 if (!gch->is_maximal_no_gc()) { | |
14309 | 689 // Try and expand heap to satisfy request. |
0 | 690 result = expand_heap_and_allocate(size, is_tlab); |
14309 | 691 // Result could be null if we are out of space. |
0 | 692 if (result != NULL) { |
693 return result; | |
694 } | |
695 } | |
696 | |
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697 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
14309 | 698 return NULL; // We didn't get to do a GC and we didn't get any memory. |
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699 } |
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700 |
0 | 701 // If this thread is not in a jni critical section, we stall |
702 // the requestor until the critical section has cleared and | |
703 // GC allowed. When the critical section clears, a GC is | |
704 // initiated by the last thread exiting the critical section; so | |
705 // we retry the allocation sequence from the beginning of the loop, | |
706 // rather than causing more, now probably unnecessary, GC attempts. | |
707 JavaThread* jthr = JavaThread::current(); | |
708 if (!jthr->in_critical()) { | |
709 MutexUnlocker mul(Heap_lock); | |
710 // Wait for JNI critical section to be exited | |
711 GC_locker::stall_until_clear(); | |
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712 gclocker_stalled_count += 1; |
0 | 713 continue; |
714 } else { | |
715 if (CheckJNICalls) { | |
716 fatal("Possible deadlock due to allocating while" | |
717 " in jni critical section"); | |
718 } | |
719 return NULL; | |
720 } | |
721 } | |
722 | |
723 // Read the gc count while the heap lock is held. | |
724 gc_count_before = Universe::heap()->total_collections(); | |
725 } | |
726 | |
13059
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|
727 VM_GenCollectForAllocation op(size, is_tlab, gc_count_before); |
0 | 728 VMThread::execute(&op); |
729 if (op.prologue_succeeded()) { | |
730 result = op.result(); | |
731 if (op.gc_locked()) { | |
732 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
14309 | 733 continue; // Retry and/or stall as necessary. |
0 | 734 } |
1387
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|
735 |
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736 // Allocation has failed and a collection |
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737 // has been done. If the gc time limit was exceeded the |
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738 // this time, return NULL so that an out-of-memory |
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739 // will be thrown. Clear gc_overhead_limit_exceeded |
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740 // so that the overhead exceeded does not persist. |
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741 |
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|
742 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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743 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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744 |
1387
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745 if (limit_exceeded && softrefs_clear) { |
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746 *gc_overhead_limit_was_exceeded = true; |
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747 size_policy()->set_gc_overhead_limit_exceeded(false); |
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|
748 if (op.result() != NULL) { |
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749 CollectedHeap::fill_with_object(op.result(), size); |
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|
750 } |
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751 return NULL; |
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|
752 } |
0 | 753 assert(result == NULL || gch->is_in_reserved(result), |
754 "result not in heap"); | |
755 return result; | |
756 } | |
757 | |
758 // Give a warning if we seem to be looping forever. | |
759 if ((QueuedAllocationWarningCount > 0) && | |
760 (try_count % QueuedAllocationWarningCount == 0)) { | |
761 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
762 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
763 } | |
764 } | |
765 } | |
766 | |
767 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
768 bool is_tlab) { | |
769 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
770 HeapWord* result = NULL; | |
771 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
772 Generation *gen = gch->get_gen(i); | |
773 if (gen->should_allocate(size, is_tlab)) { | |
774 result = gen->expand_and_allocate(size, is_tlab); | |
775 } | |
776 } | |
777 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
778 return result; | |
779 } | |
780 | |
781 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
782 bool is_tlab) { | |
783 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
784 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
785 HeapWord* result = NULL; | |
786 | |
787 assert(size != 0, "Precondition violated"); | |
788 if (GC_locker::is_active_and_needs_gc()) { | |
789 // GC locker is active; instead of a collection we will attempt | |
790 // to expand the heap, if there's room for expansion. | |
791 if (!gch->is_maximal_no_gc()) { | |
792 result = expand_heap_and_allocate(size, is_tlab); | |
793 } | |
14309 | 794 return result; // Could be null if we are out of space. |
1994
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
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diff
changeset
|
795 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 796 // Do an incremental collection. |
797 gch->do_collection(false /* full */, | |
798 false /* clear_all_soft_refs */, | |
799 size /* size */, | |
800 is_tlab /* is_tlab */, | |
801 number_of_generations() - 1 /* max_level */); | |
802 } else { | |
1994
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
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1972
diff
changeset
|
803 if (Verbose && PrintGCDetails) { |
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
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diff
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|
804 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
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diff
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|
805 } |
0 | 806 // Try a full collection; see delta for bug id 6266275 |
807 // for the original code and why this has been simplified | |
808 // with from-space allocation criteria modified and | |
809 // such allocation moved out of the safepoint path. | |
810 gch->do_collection(true /* full */, | |
811 false /* clear_all_soft_refs */, | |
812 size /* size */, | |
813 is_tlab /* is_tlab */, | |
814 number_of_generations() - 1 /* max_level */); | |
815 } | |
816 | |
817 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
818 | |
819 if (result != NULL) { | |
820 assert(gch->is_in_reserved(result), "result not in heap"); | |
821 return result; | |
822 } | |
823 | |
824 // OK, collection failed, try expansion. | |
825 result = expand_heap_and_allocate(size, is_tlab); | |
826 if (result != NULL) { | |
827 return result; | |
828 } | |
829 | |
830 // If we reach this point, we're really out of memory. Try every trick | |
831 // we can to reclaim memory. Force collection of soft references. Force | |
832 // a complete compaction of the heap. Any additional methods for finding | |
833 // free memory should be here, especially if they are expensive. If this | |
834 // attempt fails, an OOM exception will be thrown. | |
835 { | |
10287
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6843347: Boundary values in some public GC options cause crashes
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10284
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changeset
|
836 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 837 |
838 gch->do_collection(true /* full */, | |
839 true /* clear_all_soft_refs */, | |
840 size /* size */, | |
841 is_tlab /* is_tlab */, | |
842 number_of_generations() - 1 /* max_level */); | |
843 } | |
844 | |
845 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
846 if (result != NULL) { | |
847 assert(gch->is_in_reserved(result), "result not in heap"); | |
848 return result; | |
849 } | |
850 | |
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851 assert(!should_clear_all_soft_refs(), |
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852 "Flag should have been handled and cleared prior to this point"); |
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853 |
0 | 854 // What else? We might try synchronous finalization later. If the total |
855 // space available is large enough for the allocation, then a more | |
856 // complete compaction phase than we've tried so far might be | |
857 // appropriate. | |
858 return NULL; | |
859 } | |
860 | |
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861 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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862 ClassLoaderData* loader_data, |
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863 size_t word_size, |
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864 Metaspace::MetadataType mdtype) { |
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865 uint loop_count = 0; |
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866 uint gc_count = 0; |
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867 uint full_gc_count = 0; |
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868 |
6923
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|
869 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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|
870 |
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871 do { |
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872 MetaWord* result = NULL; |
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873 if (GC_locker::is_active_and_needs_gc()) { |
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874 // If the GC_locker is active, just expand and allocate. |
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875 // If that does not succeed, wait if this thread is not |
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876 // in a critical section itself. |
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877 result = |
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878 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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|
879 mdtype); |
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880 if (result != NULL) { |
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881 return result; |
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|
882 } |
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|
883 JavaThread* jthr = JavaThread::current(); |
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884 if (!jthr->in_critical()) { |
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|
885 // Wait for JNI critical section to be exited |
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|
886 GC_locker::stall_until_clear(); |
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|
887 // The GC invoked by the last thread leaving the critical |
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888 // section will be a young collection and a full collection |
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889 // is (currently) needed for unloading classes so continue |
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|
890 // to the next iteration to get a full GC. |
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|
891 continue; |
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|
892 } else { |
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893 if (CheckJNICalls) { |
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|
894 fatal("Possible deadlock due to allocating while" |
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diff
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|
895 " in jni critical section"); |
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|
896 } |
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|
897 return NULL; |
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|
898 } |
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|
899 } |
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diff
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|
900 |
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901 { // Need lock to get self consistent gc_count's |
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902 MutexLocker ml(Heap_lock); |
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903 gc_count = Universe::heap()->total_collections(); |
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904 full_gc_count = Universe::heap()->total_full_collections(); |
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|
905 } |
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|
906 |
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907 // Generate a VM operation |
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908 VM_CollectForMetadataAllocation op(loader_data, |
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909 word_size, |
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910 mdtype, |
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911 gc_count, |
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912 full_gc_count, |
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913 GCCause::_metadata_GC_threshold); |
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914 VMThread::execute(&op); |
7446
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|
915 |
14309 | 916 // If GC was locked out, try again. Check before checking success because the |
917 // prologue could have succeeded and the GC still have been locked out. | |
7446
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|
918 if (op.gc_locked()) { |
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|
919 continue; |
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|
920 } |
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|
921 |
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922 if (op.prologue_succeeded()) { |
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923 return op.result(); |
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924 } |
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925 loop_count++; |
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926 if ((QueuedAllocationWarningCount > 0) && |
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927 (loop_count % QueuedAllocationWarningCount == 0)) { |
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928 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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929 " size=%d", loop_count, word_size); |
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930 } |
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931 } while (true); // Until a GC is done |
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932 } |
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933 |
0 | 934 // Return true if any of the following is true: |
935 // . the allocation won't fit into the current young gen heap | |
936 // . gc locker is occupied (jni critical section) | |
937 // . heap memory is tight -- the most recent previous collection | |
938 // was a full collection because a partial collection (would | |
939 // have) failed and is likely to fail again | |
940 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
941 size_t word_size) const { | |
942 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
943 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
944 return (word_size > heap_word_size(gen0_capacity)) | |
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945 || GC_locker::is_active_and_needs_gc() |
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946 || gch->incremental_collection_failed(); |
0 | 947 } |
948 | |
949 | |
950 // | |
951 // MarkSweepPolicy methods | |
952 // | |
953 | |
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954 void MarkSweepPolicy::initialize_alignments() { |
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955 _space_alignment = _gen_alignment = (uintx)Generation::GenGrain; |
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956 _heap_alignment = compute_heap_alignment(); |
0 | 957 } |
958 | |
959 void MarkSweepPolicy::initialize_generations() { | |
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960 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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961 if (_generations == NULL) { |
0 | 962 vm_exit_during_initialization("Unable to allocate gen spec"); |
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963 } |
0 | 964 |
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965 if (UseParNewGC) { |
0 | 966 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
967 } else { | |
968 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
969 } | |
970 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
971 | |
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972 if (_generations[0] == NULL || _generations[1] == NULL) { |
0 | 973 vm_exit_during_initialization("Unable to allocate gen spec"); |
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974 } |
0 | 975 } |
976 | |
977 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
14309 | 978 // Initialize the policy counters - 2 collectors, 3 generations. |
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979 if (UseParNewGC) { |
0 | 980 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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981 } else { |
0 | 982 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
983 } | |
984 } | |
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985 |
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986 /////////////// Unit tests /////////////// |
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987 |
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988 #ifndef PRODUCT |
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989 // Testing that the NewSize flag is handled correct is hard because it |
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990 // depends on so many other configurable variables. This test only tries to |
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991 // verify that there are some basic rules for NewSize honored by the policies. |
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992 class TestGenCollectorPolicy { |
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993 public: |
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994 static void test() { |
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995 size_t flag_value; |
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996 |
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997 save_flags(); |
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998 |
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999 // Set some limits that makes the math simple. |
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1000 FLAG_SET_ERGO(uintx, MaxHeapSize, 180 * M); |
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1001 FLAG_SET_ERGO(uintx, InitialHeapSize, 120 * M); |
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1002 Arguments::set_min_heap_size(40 * M); |
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1003 |
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1004 // If NewSize is set on the command line, it should be used |
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1005 // for both min and initial young size if less than min heap. |
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1006 flag_value = 20 * M; |
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1007 FLAG_SET_CMDLINE(uintx, NewSize, flag_value); |
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1008 verify_min(flag_value); |
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1009 verify_initial(flag_value); |
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1010 |
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1011 // If NewSize is set on command line, but is larger than the min |
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1012 // heap size, it should only be used for initial young size. |
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1013 flag_value = 80 * M; |
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1014 FLAG_SET_CMDLINE(uintx, NewSize, flag_value); |
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1015 verify_initial(flag_value); |
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1016 |
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1017 // If NewSize has been ergonomically set, the collector policy |
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1018 // should use it for min but calculate the initial young size |
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1019 // using NewRatio. |
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1020 flag_value = 20 * M; |
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1021 FLAG_SET_ERGO(uintx, NewSize, flag_value); |
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1022 verify_min(flag_value); |
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1023 verify_scaled_initial(InitialHeapSize); |
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1024 |
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1025 restore_flags(); |
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1026 |
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1027 } |
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1028 |
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1029 static void verify_min(size_t expected) { |
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1030 MarkSweepPolicy msp; |
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1031 msp.initialize_all(); |
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1032 |
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1033 assert(msp.min_gen0_size() <= expected, err_msg("%zu > %zu", msp.min_gen0_size(), expected)); |
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1034 } |
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1035 |
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1036 static void verify_initial(size_t expected) { |
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1037 MarkSweepPolicy msp; |
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1038 msp.initialize_all(); |
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1039 |
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1040 assert(msp.initial_gen0_size() == expected, err_msg("%zu != %zu", msp.initial_gen0_size(), expected)); |
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1041 } |
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1042 |
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1043 static void verify_scaled_initial(size_t initial_heap_size) { |
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1044 MarkSweepPolicy msp; |
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1045 msp.initialize_all(); |
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1046 |
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1047 size_t expected = msp.scale_by_NewRatio_aligned(initial_heap_size); |
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1048 assert(msp.initial_gen0_size() == expected, err_msg("%zu != %zu", msp.initial_gen0_size(), expected)); |
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1049 assert(FLAG_IS_ERGO(NewSize) && NewSize == expected, |
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1050 err_msg("NewSize should have been set ergonomically to %zu, but was %zu", expected, NewSize)); |
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1051 } |
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1052 |
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1053 private: |
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1054 static size_t original_InitialHeapSize; |
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1055 static size_t original_MaxHeapSize; |
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1056 static size_t original_MaxNewSize; |
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1057 static size_t original_MinHeapDeltaBytes; |
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1058 static size_t original_NewSize; |
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1059 static size_t original_OldSize; |
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1060 |
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1061 static void save_flags() { |
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1062 original_InitialHeapSize = InitialHeapSize; |
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1063 original_MaxHeapSize = MaxHeapSize; |
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1064 original_MaxNewSize = MaxNewSize; |
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1065 original_MinHeapDeltaBytes = MinHeapDeltaBytes; |
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1066 original_NewSize = NewSize; |
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1067 original_OldSize = OldSize; |
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1068 } |
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1069 |
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1070 static void restore_flags() { |
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1071 InitialHeapSize = original_InitialHeapSize; |
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1072 MaxHeapSize = original_MaxHeapSize; |
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1073 MaxNewSize = original_MaxNewSize; |
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1074 MinHeapDeltaBytes = original_MinHeapDeltaBytes; |
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1075 NewSize = original_NewSize; |
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1076 OldSize = original_OldSize; |
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1077 } |
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1078 }; |
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1079 |
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1080 size_t TestGenCollectorPolicy::original_InitialHeapSize = 0; |
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1081 size_t TestGenCollectorPolicy::original_MaxHeapSize = 0; |
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1082 size_t TestGenCollectorPolicy::original_MaxNewSize = 0; |
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1083 size_t TestGenCollectorPolicy::original_MinHeapDeltaBytes = 0; |
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1084 size_t TestGenCollectorPolicy::original_NewSize = 0; |
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1085 size_t TestGenCollectorPolicy::original_OldSize = 0; |
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1086 |
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1087 void TestNewSize_test() { |
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1088 TestGenCollectorPolicy::test(); |
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1089 } |
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1090 |
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1091 #endif |