Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/collectorPolicy.cpp @ 13058:3aee6bc29547
8026852: Use restricted_align_down in collector policy code
Summary: Moved restricted_align_down to globalDefinitions and renamed it align_size_down_bounded
Reviewed-by: stefank, mgerdin, tschatzl
author | jwilhelm |
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date | Mon, 21 Oct 2013 18:52:13 +0200 |
parents | 4288e54fd145 |
children | 46d7652b223c |
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 |
48 // CollectorPolicy methods. | |
49 | |
50 void CollectorPolicy::initialize_flags() { | |
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51 assert(_max_alignment >= _min_alignment, |
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52 err_msg("max_alignment: " SIZE_FORMAT " less than min_alignment: " SIZE_FORMAT, |
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53 _max_alignment, _min_alignment)); |
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54 assert(_max_alignment % _min_alignment == 0, |
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55 err_msg("max_alignment: " SIZE_FORMAT " not aligned by min_alignment: " SIZE_FORMAT, |
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56 _max_alignment, _min_alignment)); |
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57 |
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58 if (MaxHeapSize < InitialHeapSize) { |
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59 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
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60 } |
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61 |
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62 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, _min_alignment); |
0 | 63 } |
64 | |
65 void CollectorPolicy::initialize_size_info() { | |
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66 // User inputs from -mx and ms must be aligned |
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67 _min_heap_byte_size = align_size_up(Arguments::min_heap_size(), _min_alignment); |
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68 _initial_heap_byte_size = align_size_up(InitialHeapSize, _min_alignment); |
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69 _max_heap_byte_size = align_size_up(MaxHeapSize, _max_alignment); |
0 | 70 |
71 // Check heap parameter properties | |
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72 if (_initial_heap_byte_size < M) { |
0 | 73 vm_exit_during_initialization("Too small initial heap"); |
74 } | |
75 // Check heap parameter properties | |
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76 if (_min_heap_byte_size < M) { |
0 | 77 vm_exit_during_initialization("Too small minimum heap"); |
78 } | |
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79 if (_initial_heap_byte_size <= NewSize) { |
0 | 80 // make sure there is at least some room in old space |
81 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
82 } | |
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83 if (_max_heap_byte_size < _min_heap_byte_size) { |
0 | 84 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
85 } | |
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86 if (_initial_heap_byte_size < _min_heap_byte_size) { |
0 | 87 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
88 } | |
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89 if (_max_heap_byte_size < _initial_heap_byte_size) { |
0 | 90 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
91 } | |
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92 |
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93 if (PrintGCDetails && Verbose) { |
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94 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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95 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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96 _min_heap_byte_size, _initial_heap_byte_size, _max_heap_byte_size); |
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97 } |
0 | 98 } |
99 | |
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100 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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101 bool result = _should_clear_all_soft_refs; |
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102 set_should_clear_all_soft_refs(false); |
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103 return result; |
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104 } |
0 | 105 |
106 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
107 int max_covered_regions) { | |
12350 | 108 return new CardTableRS(whole_heap, max_covered_regions); |
0 | 109 } |
110 | |
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111 void CollectorPolicy::cleared_all_soft_refs() { |
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112 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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113 // have been cleared in the last collection but if the gc overhear |
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114 // limit continues to be near, SoftRefs should still be cleared. |
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115 if (size_policy() != NULL) { |
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116 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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117 } |
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118 _all_soft_refs_clear = true; |
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119 } |
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120 |
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121 size_t CollectorPolicy::compute_max_alignment() { |
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122 // The card marking array and the offset arrays for old generations are |
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123 // committed in os pages as well. Make sure they are entirely full (to |
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124 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 |
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125 // byte entry and the os page size is 4096, the maximum heap size should |
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126 // be 512*4096 = 2MB aligned. |
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127 |
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128 // There is only the GenRemSet in Hotspot and only the GenRemSet::CardTable |
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129 // is supported. |
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130 // Requirements of any new remembered set implementations must be added here. |
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131 size_t alignment = GenRemSet::max_alignment_constraint(GenRemSet::CardTable); |
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132 |
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133 // Parallel GC does its own alignment of the generations to avoid requiring a |
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134 // large page (256M on some platforms) for the permanent generation. The |
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135 // other collectors should also be updated to do their own alignment and then |
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136 // this use of lcm() should be removed. |
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137 if (UseLargePages && !UseParallelGC) { |
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138 // in presence of large pages we have to make sure that our |
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139 // alignment is large page aware |
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140 alignment = lcm(os::large_page_size(), alignment); |
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141 } |
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142 |
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143 return alignment; |
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144 } |
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145 |
0 | 146 // GenCollectorPolicy methods. |
147 | |
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148 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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149 return align_size_down_bounded(base_size / (NewRatio + 1), _min_alignment); |
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150 } |
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151 |
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152 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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153 size_t maximum_size) { |
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154 size_t alignment = _min_alignment; |
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155 size_t max_minus = maximum_size - alignment; |
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156 return desired_size < max_minus ? desired_size : max_minus; |
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157 } |
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158 |
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159 |
0 | 160 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
161 size_t init_promo_size, | |
162 size_t init_survivor_size) { | |
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163 const double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; |
0 | 164 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
165 init_promo_size, | |
166 init_survivor_size, | |
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167 max_gc_pause_sec, |
0 | 168 GCTimeRatio); |
169 } | |
170 | |
171 void GenCollectorPolicy::initialize_flags() { | |
172 // All sizes must be multiples of the generation granularity. | |
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173 _min_alignment = (uintx) Generation::GenGrain; |
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174 _max_alignment = compute_max_alignment(); |
0 | 175 |
176 CollectorPolicy::initialize_flags(); | |
177 | |
178 // All generational heaps have a youngest gen; handle those flags here. | |
179 | |
180 // Adjust max size parameters | |
181 if (NewSize > MaxNewSize) { | |
182 MaxNewSize = NewSize; | |
183 } | |
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184 NewSize = align_size_down(NewSize, _min_alignment); |
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185 MaxNewSize = align_size_down(MaxNewSize, _min_alignment); |
0 | 186 |
187 // Check validity of heap flags | |
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188 assert(NewSize % _min_alignment == 0, "eden space alignment"); |
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189 assert(MaxNewSize % _min_alignment == 0, "survivor space alignment"); |
0 | 190 |
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191 if (NewSize < 3 * _min_alignment) { |
0 | 192 // make sure there room for eden and two survivor spaces |
193 vm_exit_during_initialization("Too small new size specified"); | |
194 } | |
195 if (SurvivorRatio < 1 || NewRatio < 1) { | |
12831 | 196 vm_exit_during_initialization("Invalid young gen ratio specified"); |
0 | 197 } |
198 } | |
199 | |
200 void TwoGenerationCollectorPolicy::initialize_flags() { | |
201 GenCollectorPolicy::initialize_flags(); | |
202 | |
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203 OldSize = align_size_down(OldSize, _min_alignment); |
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204 |
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205 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) { |
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206 // NewRatio will be used later to set the young generation size so we use |
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207 // it to calculate how big the heap should be based on the requested OldSize |
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208 // and NewRatio. |
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209 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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210 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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211 |
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212 calculated_heapsize = align_size_up(calculated_heapsize, _max_alignment); |
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213 MaxHeapSize = calculated_heapsize; |
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214 InitialHeapSize = calculated_heapsize; |
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215 } |
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216 MaxHeapSize = align_size_up(MaxHeapSize, _max_alignment); |
0 | 217 |
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218 // adjust max heap size if necessary |
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219 if (NewSize + OldSize > MaxHeapSize) { |
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220 if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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221 // somebody set a maximum heap size with the intention that we should not |
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222 // exceed it. Adjust New/OldSize as necessary. |
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223 uintx calculated_size = NewSize + OldSize; |
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224 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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225 // align |
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226 NewSize = align_size_down((uintx) (NewSize * shrink_factor), _min_alignment); |
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227 // OldSize is already aligned because above we aligned MaxHeapSize to |
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228 // _max_alignment, and we just made sure that NewSize is aligned to |
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229 // _min_alignment. In initialize_flags() we verified that _max_alignment |
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230 // is a multiple of _min_alignment. |
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231 OldSize = MaxHeapSize - NewSize; |
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232 } else { |
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233 MaxHeapSize = NewSize + OldSize; |
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234 } |
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235 } |
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236 // need to do this again |
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237 MaxHeapSize = align_size_up(MaxHeapSize, _max_alignment); |
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238 |
10284 | 239 // adjust max heap size if necessary |
240 if (NewSize + OldSize > MaxHeapSize) { | |
241 if (FLAG_IS_CMDLINE(MaxHeapSize)) { | |
242 // somebody set a maximum heap size with the intention that we should not | |
243 // exceed it. Adjust New/OldSize as necessary. | |
244 uintx calculated_size = NewSize + OldSize; | |
245 double shrink_factor = (double) MaxHeapSize / calculated_size; | |
246 // align | |
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247 NewSize = align_size_down((uintx) (NewSize * shrink_factor), _min_alignment); |
10284 | 248 // OldSize is already aligned because above we aligned MaxHeapSize to |
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249 // _max_alignment, and we just made sure that NewSize is aligned to |
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250 // _min_alignment. In initialize_flags() we verified that _max_alignment |
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251 // is a multiple of _min_alignment. |
10284 | 252 OldSize = MaxHeapSize - NewSize; |
253 } else { | |
254 MaxHeapSize = NewSize + OldSize; | |
255 } | |
256 } | |
257 // need to do this again | |
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258 MaxHeapSize = align_size_up(MaxHeapSize, _max_alignment); |
10284 | 259 |
0 | 260 always_do_update_barrier = UseConcMarkSweepGC; |
261 | |
262 // Check validity of heap flags | |
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263 assert(OldSize % _min_alignment == 0, "old space alignment"); |
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264 assert(MaxHeapSize % _max_alignment == 0, "maximum heap alignment"); |
0 | 265 } |
266 | |
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267 // Values set on the command line win over any ergonomically |
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268 // set command line parameters. |
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269 // Ergonomic choice of parameters are done before this |
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270 // method is called. Values for command line parameters such as NewSize |
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271 // and MaxNewSize feed those ergonomic choices into this method. |
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272 // This method makes the final generation sizings consistent with |
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273 // themselves and with overall heap sizings. |
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274 // In the absence of explicitly set command line flags, policies |
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275 // such as the use of NewRatio are used to size the generation. |
0 | 276 void GenCollectorPolicy::initialize_size_info() { |
277 CollectorPolicy::initialize_size_info(); | |
278 | |
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279 // _min_alignment is used for alignment within a generation. |
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280 // There is additional alignment done down stream for some |
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281 // collectors that sometimes causes unwanted rounding up of |
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282 // generations sizes. |
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283 |
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284 // Determine maximum size of gen0 |
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285 |
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286 size_t max_new_size = 0; |
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287 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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288 if (MaxNewSize < _min_alignment) { |
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289 max_new_size = _min_alignment; |
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290 } |
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291 if (MaxNewSize >= _max_heap_byte_size) { |
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292 max_new_size = align_size_down(_max_heap_byte_size - _min_alignment, |
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293 _min_alignment); |
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294 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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295 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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296 "new generation size of " SIZE_FORMAT "k will be used.", |
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297 MaxNewSize/K, _max_heap_byte_size/K, max_new_size/K); |
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298 } else { |
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299 max_new_size = align_size_down(MaxNewSize, _min_alignment); |
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300 } |
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301 |
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302 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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303 // specially at this point to just use an ergonomically set |
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304 // MaxNewSize to set max_new_size. For cases with small |
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305 // heaps such a policy often did not work because the MaxNewSize |
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306 // was larger than the entire heap. The interpretation given |
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307 // to ergonomically set flags is that the flags are set |
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308 // by different collectors for their own special needs but |
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309 // are not allowed to badly shape the heap. This allows the |
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310 // different collectors to decide what's best for themselves |
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311 // without having to factor in the overall heap shape. It |
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312 // can be the case in the future that the collectors would |
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313 // only make "wise" ergonomics choices and this policy could |
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314 // just accept those choices. The choices currently made are |
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315 // not always "wise". |
0 | 316 } else { |
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317 max_new_size = scale_by_NewRatio_aligned(_max_heap_byte_size); |
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318 // Bound the maximum size by NewSize below (since it historically |
0 | 319 // would have been NewSize and because the NewRatio calculation could |
320 // yield a size that is too small) and bound it by MaxNewSize above. | |
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321 // Ergonomics plays here by previously calculating the desired |
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322 // NewSize and MaxNewSize. |
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323 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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324 } |
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325 assert(max_new_size > 0, "All paths should set max_new_size"); |
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326 |
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327 // Given the maximum gen0 size, determine the initial and |
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328 // minimum gen0 sizes. |
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329 |
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330 if (_max_heap_byte_size == _min_heap_byte_size) { |
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331 // The maximum and minimum heap sizes are the same so |
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332 // the generations minimum and initial must be the |
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333 // same as its maximum. |
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334 _min_gen0_size = max_new_size; |
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335 _initial_gen0_size = max_new_size; |
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336 _max_gen0_size = max_new_size; |
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337 } else { |
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338 size_t desired_new_size = 0; |
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339 if (!FLAG_IS_DEFAULT(NewSize)) { |
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340 // If NewSize is set ergonomically (for example by cms), it |
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341 // would make sense to use it. If it is used, also use it |
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342 // to set the initial size. Although there is no reason |
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343 // the minimum size and the initial size have to be the same, |
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344 // the current implementation gets into trouble during the calculation |
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345 // of the tenured generation sizes if they are different. |
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346 // Note that this makes the initial size and the minimum size |
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347 // generally small compared to the NewRatio calculation. |
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348 _min_gen0_size = NewSize; |
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349 desired_new_size = NewSize; |
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350 max_new_size = MAX2(max_new_size, NewSize); |
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351 } else { |
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352 // For the case where NewSize is the default, use NewRatio |
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353 // to size the minimum and initial generation sizes. |
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354 // Use the default NewSize as the floor for these values. If |
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355 // NewRatio is overly large, the resulting sizes can be too |
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356 // small. |
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357 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(_min_heap_byte_size), NewSize); |
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358 desired_new_size = |
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359 MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
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360 } |
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361 |
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362 assert(_min_gen0_size > 0, "Sanity check"); |
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363 _initial_gen0_size = desired_new_size; |
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364 _max_gen0_size = max_new_size; |
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365 |
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366 // At this point the desirable initial and minimum sizes have been |
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367 // determined without regard to the maximum sizes. |
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368 |
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369 // Bound the sizes by the corresponding overall heap sizes. |
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370 _min_gen0_size = bound_minus_alignment(_min_gen0_size, _min_heap_byte_size); |
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371 _initial_gen0_size = bound_minus_alignment(_initial_gen0_size, _initial_heap_byte_size); |
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372 _max_gen0_size = bound_minus_alignment(_max_gen0_size, _max_heap_byte_size); |
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373 |
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374 // At this point all three sizes have been checked against the |
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375 // maximum sizes but have not been checked for consistency |
342
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376 // among the three. |
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377 |
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378 // Final check min <= initial <= max |
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379 _min_gen0_size = MIN2(_min_gen0_size, _max_gen0_size); |
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380 _initial_gen0_size = MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size); |
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381 _min_gen0_size = MIN2(_min_gen0_size, _initial_gen0_size); |
0 | 382 } |
383 | |
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384 if (PrintGCDetails && Verbose) { |
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385 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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386 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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387 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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388 } |
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389 } |
0 | 390 |
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391 // Call this method during the sizing of the gen1 to make |
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392 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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393 // the most freedom in sizing because it is done before the |
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394 // policy for gen1 is applied. Once gen1 policies have been applied, |
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395 // there may be conflicts in the shape of the heap and this method |
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396 // is used to make the needed adjustments. The application of the |
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397 // policies could be more sophisticated (iterative for example) but |
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398 // keeping it simple also seems a worthwhile goal. |
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399 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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400 size_t* gen1_size_ptr, |
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401 const size_t heap_size, |
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402 const size_t min_gen1_size) { |
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403 bool result = false; |
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404 |
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405 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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406 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) && |
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407 (heap_size >= min_gen1_size + _min_alignment)) { |
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408 // Adjust gen0 down to accommodate min_gen1_size |
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409 *gen0_size_ptr = align_size_down_bounded(heap_size - min_gen1_size, _min_alignment); |
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410 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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411 result = true; |
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412 } else { |
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413 *gen1_size_ptr = align_size_down_bounded(heap_size - *gen0_size_ptr, _min_alignment); |
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414 } |
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415 } |
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416 return result; |
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417 } |
0 | 418 |
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419 // Minimum sizes of the generations may be different than |
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420 // the initial sizes. An inconsistently is permitted here |
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421 // in the total size that can be specified explicitly by |
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422 // command line specification of OldSize and NewSize and |
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423 // also a command line specification of -Xms. Issue a warning |
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424 // but allow the values to pass. |
0 | 425 |
426 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
427 GenCollectorPolicy::initialize_size_info(); | |
428 | |
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429 // At this point the minimum, initial and maximum sizes |
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430 // of the overall heap and of gen0 have been determined. |
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431 // The maximum gen1 size can be determined from the maximum gen0 |
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432 // and maximum heap size since no explicit flags exits |
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433 // for setting the gen1 maximum. |
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434 _max_gen1_size = _max_heap_byte_size - _max_gen0_size; |
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435 _max_gen1_size = |
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436 MAX2((uintx)align_size_down(_max_gen1_size, _min_alignment), _min_alignment); |
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437 // If no explicit command line flag has been set for the |
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438 // gen1 size, use what is left for gen1. |
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439 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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440 // The user has not specified any value or ergonomics |
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441 // has chosen a value (which may or may not be consistent |
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442 // with the overall heap size). In either case make |
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443 // the minimum, maximum and initial sizes consistent |
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444 // with the gen0 sizes and the overall heap sizes. |
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445 assert(_min_heap_byte_size > _min_gen0_size, |
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446 "gen0 has an unexpected minimum size"); |
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447 _min_gen1_size = _min_heap_byte_size - _min_gen0_size; |
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448 _min_gen1_size = |
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449 MAX2((uintx)align_size_down(_min_gen1_size, _min_alignment), _min_alignment); |
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450 _initial_gen1_size = _initial_heap_byte_size - _initial_gen0_size; |
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451 _initial_gen1_size = |
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452 MAX2((uintx)align_size_down(_initial_gen1_size, _min_alignment), _min_alignment); |
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453 } else { |
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454 // It's been explicitly set on the command line. Use the |
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455 // OldSize and then determine the consequences. |
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456 _min_gen1_size = OldSize; |
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457 _initial_gen1_size = OldSize; |
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458 |
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459 // If the user has explicitly set an OldSize that is inconsistent |
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460 // with other command line flags, issue a warning. |
0 | 461 // The generation minimums and the overall heap mimimum should |
462 // be within one heap alignment. | |
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463 if ((_min_gen1_size + _min_gen0_size + _min_alignment) < _min_heap_byte_size) { |
0 | 464 warning("Inconsistency between minimum heap size and minimum " |
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465 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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466 _min_heap_byte_size); |
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467 } |
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468 if ((OldSize > _max_gen1_size)) { |
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469 warning("Inconsistency between maximum heap size and maximum " |
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470 "generation sizes: using maximum heap = " SIZE_FORMAT |
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471 " -XX:OldSize flag is being ignored", |
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472 _max_heap_byte_size); |
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473 } |
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474 // If there is an inconsistency between the OldSize and the minimum and/or |
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475 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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476 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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477 _min_heap_byte_size, OldSize)) { |
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478 if (PrintGCDetails && Verbose) { |
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479 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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480 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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481 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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482 } |
0 | 483 } |
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484 // Initial size |
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485 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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486 _initial_heap_byte_size, OldSize)) { |
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487 if (PrintGCDetails && Verbose) { |
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488 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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489 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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490 _min_gen0_size, _initial_gen0_size, _max_gen0_size); |
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491 } |
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492 } |
0 | 493 } |
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494 // Enforce the maximum gen1 size. |
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495 _min_gen1_size = MIN2(_min_gen1_size, _max_gen1_size); |
0 | 496 |
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497 // Check that min gen1 <= initial gen1 <= max gen1 |
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498 _initial_gen1_size = MAX2(_initial_gen1_size, _min_gen1_size); |
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499 _initial_gen1_size = MIN2(_initial_gen1_size, _max_gen1_size); |
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500 |
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501 if (PrintGCDetails && Verbose) { |
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502 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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503 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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504 _min_gen1_size, _initial_gen1_size, _max_gen1_size); |
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505 } |
0 | 506 } |
507 | |
508 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
509 bool is_tlab, | |
510 bool* gc_overhead_limit_was_exceeded) { | |
511 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
512 | |
513 debug_only(gch->check_for_valid_allocation_state()); | |
514 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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515 |
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516 // In general gc_overhead_limit_was_exceeded should be false so |
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517 // set it so here and reset it to true only if the gc time |
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518 // limit is being exceeded as checked below. |
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519 *gc_overhead_limit_was_exceeded = false; |
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520 |
0 | 521 HeapWord* result = NULL; |
522 | |
523 // Loop until the allocation is satisified, | |
524 // or unsatisfied after GC. | |
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525 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 526 HandleMark hm; // discard any handles allocated in each iteration |
527 | |
528 // First allocation attempt is lock-free. | |
529 Generation *gen0 = gch->get_gen(0); | |
530 assert(gen0->supports_inline_contig_alloc(), | |
531 "Otherwise, must do alloc within heap lock"); | |
532 if (gen0->should_allocate(size, is_tlab)) { | |
533 result = gen0->par_allocate(size, is_tlab); | |
534 if (result != NULL) { | |
535 assert(gch->is_in_reserved(result), "result not in heap"); | |
536 return result; | |
537 } | |
538 } | |
539 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
540 { | |
541 MutexLocker ml(Heap_lock); | |
542 if (PrintGC && Verbose) { | |
543 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
544 " attempting locked slow path allocation"); | |
545 } | |
546 // Note that only large objects get a shot at being | |
547 // allocated in later generations. | |
548 bool first_only = ! should_try_older_generation_allocation(size); | |
549 | |
550 result = gch->attempt_allocation(size, is_tlab, first_only); | |
551 if (result != NULL) { | |
552 assert(gch->is_in_reserved(result), "result not in heap"); | |
553 return result; | |
554 } | |
555 | |
556 if (GC_locker::is_active_and_needs_gc()) { | |
557 if (is_tlab) { | |
558 return NULL; // Caller will retry allocating individual object | |
559 } | |
560 if (!gch->is_maximal_no_gc()) { | |
561 // Try and expand heap to satisfy request | |
562 result = expand_heap_and_allocate(size, is_tlab); | |
563 // result could be null if we are out of space | |
564 if (result != NULL) { | |
565 return result; | |
566 } | |
567 } | |
568 | |
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569 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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570 return NULL; // we didn't get to do a GC and we didn't get any memory |
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571 } |
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572 |
0 | 573 // If this thread is not in a jni critical section, we stall |
574 // the requestor until the critical section has cleared and | |
575 // GC allowed. When the critical section clears, a GC is | |
576 // initiated by the last thread exiting the critical section; so | |
577 // we retry the allocation sequence from the beginning of the loop, | |
578 // rather than causing more, now probably unnecessary, GC attempts. | |
579 JavaThread* jthr = JavaThread::current(); | |
580 if (!jthr->in_critical()) { | |
581 MutexUnlocker mul(Heap_lock); | |
582 // Wait for JNI critical section to be exited | |
583 GC_locker::stall_until_clear(); | |
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584 gclocker_stalled_count += 1; |
0 | 585 continue; |
586 } else { | |
587 if (CheckJNICalls) { | |
588 fatal("Possible deadlock due to allocating while" | |
589 " in jni critical section"); | |
590 } | |
591 return NULL; | |
592 } | |
593 } | |
594 | |
595 // Read the gc count while the heap lock is held. | |
596 gc_count_before = Universe::heap()->total_collections(); | |
597 } | |
598 | |
599 VM_GenCollectForAllocation op(size, | |
600 is_tlab, | |
601 gc_count_before); | |
602 VMThread::execute(&op); | |
603 if (op.prologue_succeeded()) { | |
604 result = op.result(); | |
605 if (op.gc_locked()) { | |
606 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
607 continue; // retry and/or stall as necessary | |
608 } | |
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609 |
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610 // Allocation has failed and a collection |
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611 // has been done. If the gc time limit was exceeded the |
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612 // this time, return NULL so that an out-of-memory |
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613 // will be thrown. Clear gc_overhead_limit_exceeded |
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614 // so that the overhead exceeded does not persist. |
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615 |
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616 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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617 const bool softrefs_clear = all_soft_refs_clear(); |
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618 |
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619 if (limit_exceeded && softrefs_clear) { |
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620 *gc_overhead_limit_was_exceeded = true; |
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621 size_policy()->set_gc_overhead_limit_exceeded(false); |
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622 if (op.result() != NULL) { |
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623 CollectedHeap::fill_with_object(op.result(), size); |
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624 } |
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625 return NULL; |
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626 } |
0 | 627 assert(result == NULL || gch->is_in_reserved(result), |
628 "result not in heap"); | |
629 return result; | |
630 } | |
631 | |
632 // Give a warning if we seem to be looping forever. | |
633 if ((QueuedAllocationWarningCount > 0) && | |
634 (try_count % QueuedAllocationWarningCount == 0)) { | |
635 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
636 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
637 } | |
638 } | |
639 } | |
640 | |
641 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
642 bool is_tlab) { | |
643 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
644 HeapWord* result = NULL; | |
645 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
646 Generation *gen = gch->get_gen(i); | |
647 if (gen->should_allocate(size, is_tlab)) { | |
648 result = gen->expand_and_allocate(size, is_tlab); | |
649 } | |
650 } | |
651 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
652 return result; | |
653 } | |
654 | |
655 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
656 bool is_tlab) { | |
657 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
658 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
659 HeapWord* result = NULL; | |
660 | |
661 assert(size != 0, "Precondition violated"); | |
662 if (GC_locker::is_active_and_needs_gc()) { | |
663 // GC locker is active; instead of a collection we will attempt | |
664 // to expand the heap, if there's room for expansion. | |
665 if (!gch->is_maximal_no_gc()) { | |
666 result = expand_heap_and_allocate(size, is_tlab); | |
667 } | |
668 return result; // could be null if we are out of space | |
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669 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 670 // Do an incremental collection. |
671 gch->do_collection(false /* full */, | |
672 false /* clear_all_soft_refs */, | |
673 size /* size */, | |
674 is_tlab /* is_tlab */, | |
675 number_of_generations() - 1 /* max_level */); | |
676 } else { | |
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677 if (Verbose && PrintGCDetails) { |
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678 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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679 } |
0 | 680 // Try a full collection; see delta for bug id 6266275 |
681 // for the original code and why this has been simplified | |
682 // with from-space allocation criteria modified and | |
683 // such allocation moved out of the safepoint path. | |
684 gch->do_collection(true /* full */, | |
685 false /* clear_all_soft_refs */, | |
686 size /* size */, | |
687 is_tlab /* is_tlab */, | |
688 number_of_generations() - 1 /* max_level */); | |
689 } | |
690 | |
691 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
692 | |
693 if (result != NULL) { | |
694 assert(gch->is_in_reserved(result), "result not in heap"); | |
695 return result; | |
696 } | |
697 | |
698 // OK, collection failed, try expansion. | |
699 result = expand_heap_and_allocate(size, is_tlab); | |
700 if (result != NULL) { | |
701 return result; | |
702 } | |
703 | |
704 // If we reach this point, we're really out of memory. Try every trick | |
705 // we can to reclaim memory. Force collection of soft references. Force | |
706 // a complete compaction of the heap. Any additional methods for finding | |
707 // free memory should be here, especially if they are expensive. If this | |
708 // attempt fails, an OOM exception will be thrown. | |
709 { | |
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710 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 711 |
712 gch->do_collection(true /* full */, | |
713 true /* clear_all_soft_refs */, | |
714 size /* size */, | |
715 is_tlab /* is_tlab */, | |
716 number_of_generations() - 1 /* max_level */); | |
717 } | |
718 | |
719 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
720 if (result != NULL) { | |
721 assert(gch->is_in_reserved(result), "result not in heap"); | |
722 return result; | |
723 } | |
724 | |
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725 assert(!should_clear_all_soft_refs(), |
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726 "Flag should have been handled and cleared prior to this point"); |
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727 |
0 | 728 // What else? We might try synchronous finalization later. If the total |
729 // space available is large enough for the allocation, then a more | |
730 // complete compaction phase than we've tried so far might be | |
731 // appropriate. | |
732 return NULL; | |
733 } | |
734 | |
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735 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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736 ClassLoaderData* loader_data, |
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737 size_t word_size, |
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738 Metaspace::MetadataType mdtype) { |
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739 uint loop_count = 0; |
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740 uint gc_count = 0; |
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741 uint full_gc_count = 0; |
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742 |
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743 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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744 |
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745 do { |
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746 MetaWord* result = NULL; |
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747 if (GC_locker::is_active_and_needs_gc()) { |
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748 // If the GC_locker is active, just expand and allocate. |
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749 // If that does not succeed, wait if this thread is not |
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750 // in a critical section itself. |
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751 result = |
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752 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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753 mdtype); |
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754 if (result != NULL) { |
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755 return result; |
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756 } |
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757 JavaThread* jthr = JavaThread::current(); |
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758 if (!jthr->in_critical()) { |
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759 // Wait for JNI critical section to be exited |
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760 GC_locker::stall_until_clear(); |
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761 // The GC invoked by the last thread leaving the critical |
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762 // section will be a young collection and a full collection |
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763 // is (currently) needed for unloading classes so continue |
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764 // to the next iteration to get a full GC. |
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765 continue; |
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766 } else { |
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767 if (CheckJNICalls) { |
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768 fatal("Possible deadlock due to allocating while" |
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769 " in jni critical section"); |
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770 } |
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771 return NULL; |
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772 } |
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773 } |
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774 |
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775 { // Need lock to get self consistent gc_count's |
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776 MutexLocker ml(Heap_lock); |
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777 gc_count = Universe::heap()->total_collections(); |
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778 full_gc_count = Universe::heap()->total_full_collections(); |
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779 } |
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780 |
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781 // Generate a VM operation |
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782 VM_CollectForMetadataAllocation op(loader_data, |
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783 word_size, |
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784 mdtype, |
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785 gc_count, |
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786 full_gc_count, |
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787 GCCause::_metadata_GC_threshold); |
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788 VMThread::execute(&op); |
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789 |
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790 // If GC was locked out, try again. Check |
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791 // before checking success because the prologue |
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792 // could have succeeded and the GC still have |
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793 // been locked out. |
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794 if (op.gc_locked()) { |
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795 continue; |
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796 } |
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797 |
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798 if (op.prologue_succeeded()) { |
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799 return op.result(); |
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800 } |
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801 loop_count++; |
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802 if ((QueuedAllocationWarningCount > 0) && |
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803 (loop_count % QueuedAllocationWarningCount == 0)) { |
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804 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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805 " size=%d", loop_count, word_size); |
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806 } |
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807 } while (true); // Until a GC is done |
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808 } |
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809 |
0 | 810 // Return true if any of the following is true: |
811 // . the allocation won't fit into the current young gen heap | |
812 // . gc locker is occupied (jni critical section) | |
813 // . heap memory is tight -- the most recent previous collection | |
814 // was a full collection because a partial collection (would | |
815 // have) failed and is likely to fail again | |
816 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
817 size_t word_size) const { | |
818 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
819 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
820 return (word_size > heap_word_size(gen0_capacity)) | |
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821 || GC_locker::is_active_and_needs_gc() |
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822 || gch->incremental_collection_failed(); |
0 | 823 } |
824 | |
825 | |
826 // | |
827 // MarkSweepPolicy methods | |
828 // | |
829 | |
830 MarkSweepPolicy::MarkSweepPolicy() { | |
831 initialize_all(); | |
832 } | |
833 | |
834 void MarkSweepPolicy::initialize_generations() { | |
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835 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
0 | 836 if (_generations == NULL) |
837 vm_exit_during_initialization("Unable to allocate gen spec"); | |
838 | |
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839 if (UseParNewGC) { |
0 | 840 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
841 } else { | |
842 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
843 } | |
844 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
845 | |
846 if (_generations[0] == NULL || _generations[1] == NULL) | |
847 vm_exit_during_initialization("Unable to allocate gen spec"); | |
848 } | |
849 | |
850 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
851 // initialize the policy counters - 2 collectors, 3 generations | |
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852 if (UseParNewGC) { |
0 | 853 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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854 } else { |
0 | 855 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
856 } | |
857 } |