Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | f08d439fab8c |
| children | 8da5e203b993 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" | |
| 40 #include "runtime/vmThread.hpp" | |
| 41 #ifdef TARGET_OS_FAMILY_linux | |
| 42 # include "thread_linux.inline.hpp" | |
| 43 #endif | |
| 44 #ifdef TARGET_OS_FAMILY_solaris | |
| 45 # include "thread_solaris.inline.hpp" | |
| 46 #endif | |
| 47 #ifdef TARGET_OS_FAMILY_windows | |
| 48 # include "thread_windows.inline.hpp" | |
| 49 #endif | |
| 3960 | 50 #ifdef TARGET_OS_FAMILY_bsd |
| 51 # include "thread_bsd.inline.hpp" | |
| 52 #endif | |
| 1972 | 53 #ifndef SERIALGC |
| 54 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
| 55 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp" | |
| 56 #endif | |
| 0 | 57 |
| 58 // CollectorPolicy methods. | |
| 59 | |
| 60 void CollectorPolicy::initialize_flags() { | |
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61 if (MetaspaceSize > MaxMetaspaceSize) { |
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62 MaxMetaspaceSize = MetaspaceSize; |
| 0 | 63 } |
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64 MetaspaceSize = MAX2(min_alignment(), align_size_down_(MetaspaceSize, min_alignment())); |
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65 // Don't increase Metaspace size limit above specified. |
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66 MaxMetaspaceSize = align_size_down(MaxMetaspaceSize, max_alignment()); |
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67 if (MetaspaceSize > MaxMetaspaceSize) { |
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68 MetaspaceSize = MaxMetaspaceSize; |
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69 } |
| 0 | 70 |
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71 MinMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MinMetaspaceExpansion, min_alignment())); |
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72 MaxMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MaxMetaspaceExpansion, min_alignment())); |
| 0 | 73 |
| 74 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
| 75 | |
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76 assert(MetaspaceSize % min_alignment() == 0, "metapace alignment"); |
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77 assert(MaxMetaspaceSize % max_alignment() == 0, "maximum metaspace alignment"); |
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78 if (MetaspaceSize < 256*K) { |
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79 vm_exit_during_initialization("Too small initial Metaspace size"); |
| 0 | 80 } |
| 81 } | |
| 82 | |
| 83 void CollectorPolicy::initialize_size_info() { | |
| 84 // User inputs from -mx and ms are aligned | |
| 1064 | 85 set_initial_heap_byte_size(InitialHeapSize); |
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86 if (initial_heap_byte_size() == 0) { |
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87 set_initial_heap_byte_size(NewSize + OldSize); |
| 0 | 88 } |
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89 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size, |
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90 min_alignment())); |
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91 |
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92 set_min_heap_byte_size(Arguments::min_heap_size()); |
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93 if (min_heap_byte_size() == 0) { |
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94 set_min_heap_byte_size(NewSize + OldSize); |
| 0 | 95 } |
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96 set_min_heap_byte_size(align_size_up(_min_heap_byte_size, |
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97 min_alignment())); |
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98 |
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99 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
| 0 | 100 |
| 101 // Check heap parameter properties | |
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102 if (initial_heap_byte_size() < M) { |
| 0 | 103 vm_exit_during_initialization("Too small initial heap"); |
| 104 } | |
| 105 // Check heap parameter properties | |
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106 if (min_heap_byte_size() < M) { |
| 0 | 107 vm_exit_during_initialization("Too small minimum heap"); |
| 108 } | |
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109 if (initial_heap_byte_size() <= NewSize) { |
| 0 | 110 // make sure there is at least some room in old space |
| 111 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
| 112 } | |
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113 if (max_heap_byte_size() < min_heap_byte_size()) { |
| 0 | 114 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
| 115 } | |
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116 if (initial_heap_byte_size() < min_heap_byte_size()) { |
| 0 | 117 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
| 118 } | |
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119 if (max_heap_byte_size() < initial_heap_byte_size()) { |
| 0 | 120 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
| 121 } | |
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122 |
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123 if (PrintGCDetails && Verbose) { |
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124 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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125 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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126 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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127 } |
| 0 | 128 } |
| 129 | |
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130 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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131 bool result = _should_clear_all_soft_refs; |
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132 set_should_clear_all_soft_refs(false); |
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133 return result; |
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134 } |
| 0 | 135 |
| 136 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
| 137 int max_covered_regions) { | |
| 138 switch (rem_set_name()) { | |
| 139 case GenRemSet::CardTable: { | |
| 140 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
| 141 return res; | |
| 142 } | |
| 143 default: | |
| 144 guarantee(false, "unrecognized GenRemSet::Name"); | |
| 145 return NULL; | |
| 146 } | |
| 147 } | |
| 148 | |
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149 void CollectorPolicy::cleared_all_soft_refs() { |
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150 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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151 // have been cleared in the last collection but if the gc overhear |
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152 // limit continues to be near, SoftRefs should still be cleared. |
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153 if (size_policy() != NULL) { |
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154 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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155 } |
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156 _all_soft_refs_clear = true; |
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157 } |
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158 |
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159 |
| 0 | 160 // GenCollectorPolicy methods. |
| 161 | |
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162 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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163 size_t x = base_size / (NewRatio+1); |
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164 size_t new_gen_size = x > min_alignment() ? |
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165 align_size_down(x, min_alignment()) : |
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166 min_alignment(); |
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167 return new_gen_size; |
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168 } |
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169 |
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170 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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171 size_t maximum_size) { |
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172 size_t alignment = min_alignment(); |
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173 size_t max_minus = maximum_size - alignment; |
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174 return desired_size < max_minus ? desired_size : max_minus; |
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175 } |
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176 |
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177 |
| 0 | 178 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
| 179 size_t init_promo_size, | |
| 180 size_t init_survivor_size) { | |
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181 const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
| 0 | 182 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
| 183 init_promo_size, | |
| 184 init_survivor_size, | |
| 185 max_gc_minor_pause_sec, | |
| 186 GCTimeRatio); | |
| 187 } | |
| 188 | |
| 189 size_t GenCollectorPolicy::compute_max_alignment() { | |
| 190 // The card marking array and the offset arrays for old generations are | |
| 191 // committed in os pages as well. Make sure they are entirely full (to | |
| 192 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
| 193 // byte entry and the os page size is 4096, the maximum heap size should | |
| 194 // be 512*4096 = 2MB aligned. | |
| 195 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
| 196 | |
| 197 // Parallel GC does its own alignment of the generations to avoid requiring a | |
| 198 // large page (256M on some platforms) for the permanent generation. The | |
| 199 // other collectors should also be updated to do their own alignment and then | |
| 200 // this use of lcm() should be removed. | |
| 201 if (UseLargePages && !UseParallelGC) { | |
| 202 // in presence of large pages we have to make sure that our | |
| 203 // alignment is large page aware | |
| 204 alignment = lcm(os::large_page_size(), alignment); | |
| 205 } | |
| 206 | |
| 207 return alignment; | |
| 208 } | |
| 209 | |
| 210 void GenCollectorPolicy::initialize_flags() { | |
| 211 // All sizes must be multiples of the generation granularity. | |
| 212 set_min_alignment((uintx) Generation::GenGrain); | |
| 213 set_max_alignment(compute_max_alignment()); | |
| 214 assert(max_alignment() >= min_alignment() && | |
| 215 max_alignment() % min_alignment() == 0, | |
| 216 "invalid alignment constraints"); | |
| 217 | |
| 218 CollectorPolicy::initialize_flags(); | |
| 219 | |
| 220 // All generational heaps have a youngest gen; handle those flags here. | |
| 221 | |
| 222 // Adjust max size parameters | |
| 223 if (NewSize > MaxNewSize) { | |
| 224 MaxNewSize = NewSize; | |
| 225 } | |
| 226 NewSize = align_size_down(NewSize, min_alignment()); | |
| 227 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
| 228 | |
| 229 // Check validity of heap flags | |
| 230 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
| 231 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
| 232 | |
| 233 if (NewSize < 3*min_alignment()) { | |
| 234 // make sure there room for eden and two survivor spaces | |
| 235 vm_exit_during_initialization("Too small new size specified"); | |
| 236 } | |
| 237 if (SurvivorRatio < 1 || NewRatio < 1) { | |
| 238 vm_exit_during_initialization("Invalid heap ratio specified"); | |
| 239 } | |
| 240 } | |
| 241 | |
| 242 void TwoGenerationCollectorPolicy::initialize_flags() { | |
| 243 GenCollectorPolicy::initialize_flags(); | |
| 244 | |
| 245 OldSize = align_size_down(OldSize, min_alignment()); | |
| 246 if (NewSize + OldSize > MaxHeapSize) { | |
| 247 MaxHeapSize = NewSize + OldSize; | |
| 248 } | |
| 249 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
| 250 | |
| 251 always_do_update_barrier = UseConcMarkSweepGC; | |
| 252 | |
| 253 // Check validity of heap flags | |
| 254 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
| 255 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
| 256 } | |
| 257 | |
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258 // Values set on the command line win over any ergonomically |
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259 // set command line parameters. |
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260 // Ergonomic choice of parameters are done before this |
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261 // method is called. Values for command line parameters such as NewSize |
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262 // and MaxNewSize feed those ergonomic choices into this method. |
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263 // This method makes the final generation sizings consistent with |
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264 // themselves and with overall heap sizings. |
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265 // In the absence of explicitly set command line flags, policies |
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266 // such as the use of NewRatio are used to size the generation. |
| 0 | 267 void GenCollectorPolicy::initialize_size_info() { |
| 268 CollectorPolicy::initialize_size_info(); | |
| 269 | |
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270 // min_alignment() is used for alignment within a generation. |
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271 // There is additional alignment done down stream for some |
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272 // collectors that sometimes causes unwanted rounding up of |
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273 // generations sizes. |
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274 |
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275 // Determine maximum size of gen0 |
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276 |
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277 size_t max_new_size = 0; |
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278 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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279 if (MaxNewSize < min_alignment()) { |
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280 max_new_size = min_alignment(); |
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281 } |
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282 if (MaxNewSize >= max_heap_byte_size()) { |
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283 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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284 min_alignment()); |
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285 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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286 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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287 "new generation size of " SIZE_FORMAT "k will be used.", |
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288 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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289 } else { |
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290 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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291 } |
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292 |
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293 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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294 // specially at this point to just use an ergonomically set |
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295 // MaxNewSize to set max_new_size. For cases with small |
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296 // heaps such a policy often did not work because the MaxNewSize |
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297 // was larger than the entire heap. The interpretation given |
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298 // to ergonomically set flags is that the flags are set |
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299 // by different collectors for their own special needs but |
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300 // are not allowed to badly shape the heap. This allows the |
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301 // different collectors to decide what's best for themselves |
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302 // without having to factor in the overall heap shape. It |
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303 // can be the case in the future that the collectors would |
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304 // only make "wise" ergonomics choices and this policy could |
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305 // just accept those choices. The choices currently made are |
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306 // not always "wise". |
| 0 | 307 } else { |
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308 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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309 // Bound the maximum size by NewSize below (since it historically |
| 0 | 310 // would have been NewSize and because the NewRatio calculation could |
| 311 // yield a size that is too small) and bound it by MaxNewSize above. | |
|
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312 // Ergonomics plays here by previously calculating the desired |
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313 // NewSize and MaxNewSize. |
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314 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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315 } |
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316 assert(max_new_size > 0, "All paths should set max_new_size"); |
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317 |
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318 // Given the maximum gen0 size, determine the initial and |
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319 // minimum gen0 sizes. |
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320 |
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321 if (max_heap_byte_size() == min_heap_byte_size()) { |
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322 // The maximum and minimum heap sizes are the same so |
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323 // the generations minimum and initial must be the |
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324 // same as its maximum. |
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325 set_min_gen0_size(max_new_size); |
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326 set_initial_gen0_size(max_new_size); |
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327 set_max_gen0_size(max_new_size); |
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328 } else { |
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329 size_t desired_new_size = 0; |
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330 if (!FLAG_IS_DEFAULT(NewSize)) { |
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331 // If NewSize is set ergonomically (for example by cms), it |
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332 // would make sense to use it. If it is used, also use it |
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333 // to set the initial size. Although there is no reason |
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334 // the minimum size and the initial size have to be the same, |
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335 // the current implementation gets into trouble during the calculation |
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336 // of the tenured generation sizes if they are different. |
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337 // Note that this makes the initial size and the minimum size |
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338 // generally small compared to the NewRatio calculation. |
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339 _min_gen0_size = NewSize; |
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340 desired_new_size = NewSize; |
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341 max_new_size = MAX2(max_new_size, NewSize); |
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342 } else { |
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343 // For the case where NewSize is the default, use NewRatio |
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344 // to size the minimum and initial generation sizes. |
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345 // Use the default NewSize as the floor for these values. If |
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346 // NewRatio is overly large, the resulting sizes can be too |
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347 // small. |
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348 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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349 NewSize); |
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350 desired_new_size = |
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351 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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352 NewSize); |
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353 } |
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354 |
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355 assert(_min_gen0_size > 0, "Sanity check"); |
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356 set_initial_gen0_size(desired_new_size); |
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357 set_max_gen0_size(max_new_size); |
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358 |
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359 // At this point the desirable initial and minimum sizes have been |
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360 // determined without regard to the maximum sizes. |
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361 |
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362 // Bound the sizes by the corresponding overall heap sizes. |
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363 set_min_gen0_size( |
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364 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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365 set_initial_gen0_size( |
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366 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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367 set_max_gen0_size( |
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368 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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369 |
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370 // At this point all three sizes have been checked against the |
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371 // maximum sizes but have not been checked for consistency |
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342
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372 // among the three. |
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373 |
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374 // Final check min <= initial <= max |
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375 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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376 set_initial_gen0_size( |
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377 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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378 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
| 0 | 379 } |
| 380 | |
|
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381 if (PrintGCDetails && Verbose) { |
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382 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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383 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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384 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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385 } |
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386 } |
| 0 | 387 |
|
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388 // Call this method during the sizing of the gen1 to make |
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389 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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390 // the most freedom in sizing because it is done before the |
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391 // policy for gen1 is applied. Once gen1 policies have been applied, |
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392 // there may be conflicts in the shape of the heap and this method |
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393 // is used to make the needed adjustments. The application of the |
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394 // policies could be more sophisticated (iterative for example) but |
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395 // keeping it simple also seems a worthwhile goal. |
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396 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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397 size_t* gen1_size_ptr, |
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398 size_t heap_size, |
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399 size_t min_gen0_size) { |
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400 bool result = false; |
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401 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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402 if (((*gen0_size_ptr + OldSize) > heap_size) && |
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403 (heap_size - min_gen0_size) >= min_alignment()) { |
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404 // Adjust gen0 down to accomodate OldSize |
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405 *gen0_size_ptr = heap_size - min_gen0_size; |
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406 *gen0_size_ptr = |
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407 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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408 min_alignment()); |
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409 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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410 result = true; |
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411 } else { |
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412 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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413 *gen1_size_ptr = |
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414 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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415 min_alignment()); |
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416 } |
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417 } |
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418 return result; |
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419 } |
| 0 | 420 |
|
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421 // Minimum sizes of the generations may be different than |
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422 // the initial sizes. An inconsistently is permitted here |
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423 // in the total size that can be specified explicitly by |
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424 // command line specification of OldSize and NewSize and |
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425 // also a command line specification of -Xms. Issue a warning |
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426 // but allow the values to pass. |
| 0 | 427 |
| 428 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
| 429 GenCollectorPolicy::initialize_size_info(); | |
| 430 | |
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431 // At this point the minimum, initial and maximum sizes |
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432 // of the overall heap and of gen0 have been determined. |
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433 // The maximum gen1 size can be determined from the maximum gen0 |
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434 // and maximum heap size since no explicit flags exits |
|
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435 // for setting the gen1 maximum. |
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436 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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437 _max_gen1_size = |
|
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438 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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439 min_alignment()); |
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440 // If no explicit command line flag has been set for the |
|
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441 // gen1 size, use what is left for gen1. |
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442 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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443 // The user has not specified any value or ergonomics |
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444 // has chosen a value (which may or may not be consistent |
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445 // with the overall heap size). In either case make |
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446 // the minimum, maximum and initial sizes consistent |
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447 // with the gen0 sizes and the overall heap sizes. |
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448 assert(min_heap_byte_size() > _min_gen0_size, |
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449 "gen0 has an unexpected minimum size"); |
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450 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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451 set_min_gen1_size( |
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452 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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453 min_alignment())); |
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454 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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455 set_initial_gen1_size( |
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456 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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457 min_alignment())); |
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458 |
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459 } else { |
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460 // It's been explicitly set on the command line. Use the |
|
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461 // OldSize and then determine the consequences. |
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462 set_min_gen1_size(OldSize); |
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463 set_initial_gen1_size(OldSize); |
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464 |
|
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465 // If the user has explicitly set an OldSize that is inconsistent |
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466 // with other command line flags, issue a warning. |
| 0 | 467 // The generation minimums and the overall heap mimimum should |
| 468 // be within one heap alignment. | |
|
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469 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
|
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470 min_heap_byte_size()) { |
| 0 | 471 warning("Inconsistency between minimum heap size and minimum " |
|
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472 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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473 min_heap_byte_size()); |
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474 } |
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475 if ((OldSize > _max_gen1_size)) { |
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476 warning("Inconsistency between maximum heap size and maximum " |
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477 "generation sizes: using maximum heap = " SIZE_FORMAT |
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478 " -XX:OldSize flag is being ignored", |
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479 max_heap_byte_size()); |
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480 } |
|
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481 // If there is an inconsistency between the OldSize and the minimum and/or |
|
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482 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
|
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483 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
|
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484 min_heap_byte_size(), OldSize)) { |
|
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485 if (PrintGCDetails && Verbose) { |
|
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486 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
|
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487 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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488 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
|
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489 } |
| 0 | 490 } |
|
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491 // Initial size |
|
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492 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
|
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493 initial_heap_byte_size(), OldSize)) { |
|
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494 if (PrintGCDetails && Verbose) { |
|
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495 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
|
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496 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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497 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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498 } |
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499 } |
| 0 | 500 } |
|
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501 // Enforce the maximum gen1 size. |
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502 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
| 0 | 503 |
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504 // Check that min gen1 <= initial gen1 <= max gen1 |
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505 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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506 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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507 |
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508 if (PrintGCDetails && Verbose) { |
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509 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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510 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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511 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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512 } |
| 0 | 513 } |
| 514 | |
| 515 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
| 516 bool is_tlab, | |
| 517 bool* gc_overhead_limit_was_exceeded) { | |
| 518 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 519 | |
| 520 debug_only(gch->check_for_valid_allocation_state()); | |
| 521 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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522 |
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523 // In general gc_overhead_limit_was_exceeded should be false so |
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524 // set it so here and reset it to true only if the gc time |
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525 // limit is being exceeded as checked below. |
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526 *gc_overhead_limit_was_exceeded = false; |
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527 |
| 0 | 528 HeapWord* result = NULL; |
| 529 | |
| 530 // Loop until the allocation is satisified, | |
| 531 // or unsatisfied after GC. | |
| 532 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 533 HandleMark hm; // discard any handles allocated in each iteration | |
| 534 | |
| 535 // First allocation attempt is lock-free. | |
| 536 Generation *gen0 = gch->get_gen(0); | |
| 537 assert(gen0->supports_inline_contig_alloc(), | |
| 538 "Otherwise, must do alloc within heap lock"); | |
| 539 if (gen0->should_allocate(size, is_tlab)) { | |
| 540 result = gen0->par_allocate(size, is_tlab); | |
| 541 if (result != NULL) { | |
| 542 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 543 return result; | |
| 544 } | |
| 545 } | |
| 546 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
| 547 { | |
| 548 MutexLocker ml(Heap_lock); | |
| 549 if (PrintGC && Verbose) { | |
| 550 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
| 551 " attempting locked slow path allocation"); | |
| 552 } | |
| 553 // Note that only large objects get a shot at being | |
| 554 // allocated in later generations. | |
| 555 bool first_only = ! should_try_older_generation_allocation(size); | |
| 556 | |
| 557 result = gch->attempt_allocation(size, is_tlab, first_only); | |
| 558 if (result != NULL) { | |
| 559 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 560 return result; | |
| 561 } | |
| 562 | |
| 563 if (GC_locker::is_active_and_needs_gc()) { | |
| 564 if (is_tlab) { | |
| 565 return NULL; // Caller will retry allocating individual object | |
| 566 } | |
| 567 if (!gch->is_maximal_no_gc()) { | |
| 568 // Try and expand heap to satisfy request | |
| 569 result = expand_heap_and_allocate(size, is_tlab); | |
| 570 // result could be null if we are out of space | |
| 571 if (result != NULL) { | |
| 572 return result; | |
| 573 } | |
| 574 } | |
| 575 | |
| 576 // If this thread is not in a jni critical section, we stall | |
| 577 // the requestor until the critical section has cleared and | |
| 578 // GC allowed. When the critical section clears, a GC is | |
| 579 // initiated by the last thread exiting the critical section; so | |
| 580 // we retry the allocation sequence from the beginning of the loop, | |
| 581 // rather than causing more, now probably unnecessary, GC attempts. | |
| 582 JavaThread* jthr = JavaThread::current(); | |
| 583 if (!jthr->in_critical()) { | |
| 584 MutexUnlocker mul(Heap_lock); | |
| 585 // Wait for JNI critical section to be exited | |
| 586 GC_locker::stall_until_clear(); | |
| 587 continue; | |
| 588 } else { | |
| 589 if (CheckJNICalls) { | |
| 590 fatal("Possible deadlock due to allocating while" | |
| 591 " in jni critical section"); | |
| 592 } | |
| 593 return NULL; | |
| 594 } | |
| 595 } | |
| 596 | |
| 597 // Read the gc count while the heap lock is held. | |
| 598 gc_count_before = Universe::heap()->total_collections(); | |
| 599 } | |
| 600 | |
| 601 VM_GenCollectForAllocation op(size, | |
| 602 is_tlab, | |
| 603 gc_count_before); | |
| 604 VMThread::execute(&op); | |
| 605 if (op.prologue_succeeded()) { | |
| 606 result = op.result(); | |
| 607 if (op.gc_locked()) { | |
| 608 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
| 609 continue; // retry and/or stall as necessary | |
| 610 } | |
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611 |
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612 // Allocation has failed and a collection |
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613 // has been done. If the gc time limit was exceeded the |
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614 // this time, return NULL so that an out-of-memory |
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615 // will be thrown. Clear gc_overhead_limit_exceeded |
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616 // so that the overhead exceeded does not persist. |
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617 |
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618 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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619 const bool softrefs_clear = all_soft_refs_clear(); |
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620 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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621 if (limit_exceeded && softrefs_clear) { |
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622 *gc_overhead_limit_was_exceeded = true; |
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623 size_policy()->set_gc_overhead_limit_exceeded(false); |
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624 if (op.result() != NULL) { |
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625 CollectedHeap::fill_with_object(op.result(), size); |
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626 } |
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627 return NULL; |
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628 } |
| 0 | 629 assert(result == NULL || gch->is_in_reserved(result), |
| 630 "result not in heap"); | |
| 631 return result; | |
| 632 } | |
| 633 | |
| 634 // Give a warning if we seem to be looping forever. | |
| 635 if ((QueuedAllocationWarningCount > 0) && | |
| 636 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 637 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
| 638 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
| 639 } | |
| 640 } | |
| 641 } | |
| 642 | |
| 643 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
| 644 bool is_tlab) { | |
| 645 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 646 HeapWord* result = NULL; | |
| 647 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
| 648 Generation *gen = gch->get_gen(i); | |
| 649 if (gen->should_allocate(size, is_tlab)) { | |
| 650 result = gen->expand_and_allocate(size, is_tlab); | |
| 651 } | |
| 652 } | |
| 653 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
| 654 return result; | |
| 655 } | |
| 656 | |
| 657 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 658 bool is_tlab) { | |
| 659 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 660 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
| 661 HeapWord* result = NULL; | |
| 662 | |
| 663 assert(size != 0, "Precondition violated"); | |
| 664 if (GC_locker::is_active_and_needs_gc()) { | |
| 665 // GC locker is active; instead of a collection we will attempt | |
| 666 // to expand the heap, if there's room for expansion. | |
| 667 if (!gch->is_maximal_no_gc()) { | |
| 668 result = expand_heap_and_allocate(size, is_tlab); | |
| 669 } | |
| 670 return result; // could be null if we are out of space | |
|
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671 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
| 0 | 672 // Do an incremental collection. |
| 673 gch->do_collection(false /* full */, | |
| 674 false /* clear_all_soft_refs */, | |
| 675 size /* size */, | |
| 676 is_tlab /* is_tlab */, | |
| 677 number_of_generations() - 1 /* max_level */); | |
| 678 } else { | |
|
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679 if (Verbose && PrintGCDetails) { |
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680 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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681 } |
| 0 | 682 // Try a full collection; see delta for bug id 6266275 |
| 683 // for the original code and why this has been simplified | |
| 684 // with from-space allocation criteria modified and | |
| 685 // such allocation moved out of the safepoint path. | |
| 686 gch->do_collection(true /* full */, | |
| 687 false /* clear_all_soft_refs */, | |
| 688 size /* size */, | |
| 689 is_tlab /* is_tlab */, | |
| 690 number_of_generations() - 1 /* max_level */); | |
| 691 } | |
| 692 | |
| 693 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
| 694 | |
| 695 if (result != NULL) { | |
| 696 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 697 return result; | |
| 698 } | |
| 699 | |
| 700 // OK, collection failed, try expansion. | |
| 701 result = expand_heap_and_allocate(size, is_tlab); | |
| 702 if (result != NULL) { | |
| 703 return result; | |
| 704 } | |
| 705 | |
| 706 // If we reach this point, we're really out of memory. Try every trick | |
| 707 // we can to reclaim memory. Force collection of soft references. Force | |
| 708 // a complete compaction of the heap. Any additional methods for finding | |
| 709 // free memory should be here, especially if they are expensive. If this | |
| 710 // attempt fails, an OOM exception will be thrown. | |
| 711 { | |
| 712 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
| 713 | |
| 714 gch->do_collection(true /* full */, | |
| 715 true /* clear_all_soft_refs */, | |
| 716 size /* size */, | |
| 717 is_tlab /* is_tlab */, | |
| 718 number_of_generations() - 1 /* max_level */); | |
| 719 } | |
| 720 | |
| 721 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
| 722 if (result != NULL) { | |
| 723 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 724 return result; | |
| 725 } | |
| 726 | |
|
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727 assert(!should_clear_all_soft_refs(), |
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728 "Flag should have been handled and cleared prior to this point"); |
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729 |
| 0 | 730 // What else? We might try synchronous finalization later. If the total |
| 731 // space available is large enough for the allocation, then a more | |
| 732 // complete compaction phase than we've tried so far might be | |
| 733 // appropriate. | |
| 734 return NULL; | |
| 735 } | |
| 736 | |
|
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737 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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738 ClassLoaderData* loader_data, |
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739 size_t word_size, |
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740 Metaspace::MetadataType mdtype) { |
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741 uint loop_count = 0; |
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742 uint gc_count = 0; |
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743 uint full_gc_count = 0; |
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744 |
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745 do { |
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746 { // Need lock to get self consistent gc_count's |
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747 MutexLocker ml(Heap_lock); |
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748 gc_count = Universe::heap()->total_collections(); |
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749 full_gc_count = Universe::heap()->total_full_collections(); |
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750 } |
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751 |
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752 // Generate a VM operation |
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753 VM_CollectForMetadataAllocation op(loader_data, |
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754 word_size, |
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755 mdtype, |
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756 gc_count, |
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757 full_gc_count, |
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758 GCCause::_metadata_GC_threshold); |
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759 VMThread::execute(&op); |
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760 if (op.prologue_succeeded()) { |
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761 return op.result(); |
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762 } |
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763 loop_count++; |
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764 if ((QueuedAllocationWarningCount > 0) && |
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765 (loop_count % QueuedAllocationWarningCount == 0)) { |
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766 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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767 " size=%d", loop_count, word_size); |
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768 } |
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769 } while (true); // Until a GC is done |
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770 } |
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771 |
| 0 | 772 // Return true if any of the following is true: |
| 773 // . the allocation won't fit into the current young gen heap | |
| 774 // . gc locker is occupied (jni critical section) | |
| 775 // . heap memory is tight -- the most recent previous collection | |
| 776 // was a full collection because a partial collection (would | |
| 777 // have) failed and is likely to fail again | |
| 778 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
| 779 size_t word_size) const { | |
| 780 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 781 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
| 782 return (word_size > heap_word_size(gen0_capacity)) | |
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783 || GC_locker::is_active_and_needs_gc() |
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784 || gch->incremental_collection_failed(); |
| 0 | 785 } |
| 786 | |
| 787 | |
| 788 // | |
| 789 // MarkSweepPolicy methods | |
| 790 // | |
| 791 | |
| 792 MarkSweepPolicy::MarkSweepPolicy() { | |
| 793 initialize_all(); | |
| 794 } | |
| 795 | |
| 796 void MarkSweepPolicy::initialize_generations() { | |
| 797 _generations = new GenerationSpecPtr[number_of_generations()]; | |
| 798 if (_generations == NULL) | |
| 799 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 800 | |
| 801 if (UseParNewGC && ParallelGCThreads > 0) { | |
| 802 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
| 803 } else { | |
| 804 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
| 805 } | |
| 806 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
| 807 | |
| 808 if (_generations[0] == NULL || _generations[1] == NULL) | |
| 809 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 810 } | |
| 811 | |
| 812 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
| 813 // initialize the policy counters - 2 collectors, 3 generations | |
| 814 if (UseParNewGC && ParallelGCThreads > 0) { | |
| 815 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
| 816 } | |
| 817 else { | |
| 818 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
| 819 } | |
| 820 } |