Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/genCollectedHeap.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Mon, 18 Sep 2017 18:49:45 +0200 |
| parents | dd9cc155639c |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
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29 #include "code/codeCache.hpp" |
| 1972 | 30 #include "code/icBuffer.hpp" |
| 31 #include "gc_implementation/shared/collectorCounters.hpp" | |
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32 #include "gc_implementation/shared/gcTrace.hpp" |
| 10405 | 33 #include "gc_implementation/shared/gcTraceTime.hpp" |
| 1972 | 34 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 35 #include "gc_interface/collectedHeap.inline.hpp" | |
| 36 #include "memory/filemap.hpp" | |
| 37 #include "memory/gcLocker.inline.hpp" | |
| 38 #include "memory/genCollectedHeap.hpp" | |
| 39 #include "memory/genOopClosures.inline.hpp" | |
| 40 #include "memory/generation.inline.hpp" | |
| 41 #include "memory/generationSpec.hpp" | |
| 42 #include "memory/resourceArea.hpp" | |
| 43 #include "memory/sharedHeap.hpp" | |
| 44 #include "memory/space.hpp" | |
| 45 #include "oops/oop.inline.hpp" | |
| 46 #include "oops/oop.inline2.hpp" | |
| 47 #include "runtime/biasedLocking.hpp" | |
| 48 #include "runtime/fprofiler.hpp" | |
| 49 #include "runtime/handles.hpp" | |
| 50 #include "runtime/handles.inline.hpp" | |
| 51 #include "runtime/java.hpp" | |
| 52 #include "runtime/vmThread.hpp" | |
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53 #include "services/management.hpp" |
| 1972 | 54 #include "services/memoryService.hpp" |
| 55 #include "utilities/vmError.hpp" | |
| 56 #include "utilities/workgroup.hpp" | |
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57 #include "utilities/macros.hpp" |
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58 #if INCLUDE_ALL_GCS |
| 1972 | 59 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
| 60 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
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61 #endif // INCLUDE_ALL_GCS |
| 0 | 62 |
| 63 GenCollectedHeap* GenCollectedHeap::_gch; | |
| 64 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
| 65 | |
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66 // The set of potentially parallel tasks in root scanning. |
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67 enum GCH_strong_roots_tasks { |
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68 GCH_PS_Universe_oops_do, |
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69 GCH_PS_JNIHandles_oops_do, |
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70 GCH_PS_ObjectSynchronizer_oops_do, |
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71 GCH_PS_FlatProfiler_oops_do, |
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72 GCH_PS_Management_oops_do, |
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73 GCH_PS_SystemDictionary_oops_do, |
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74 GCH_PS_ClassLoaderDataGraph_oops_do, |
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75 GCH_PS_jvmti_oops_do, |
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76 GCH_PS_CodeCache_oops_do, |
| 0 | 77 GCH_PS_younger_gens, |
| 78 // Leave this one last. | |
| 79 GCH_PS_NumElements | |
| 80 }; | |
| 81 | |
| 82 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
| 83 SharedHeap(policy), | |
| 84 _gen_policy(policy), | |
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85 _process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), |
| 0 | 86 _full_collections_completed(0) |
| 87 { | |
| 88 assert(policy != NULL, "Sanity check"); | |
| 89 } | |
| 90 | |
| 91 jint GenCollectedHeap::initialize() { | |
| 1166 | 92 CollectedHeap::pre_initialize(); |
| 93 | |
| 0 | 94 int i; |
| 95 _n_gens = gen_policy()->number_of_generations(); | |
| 96 | |
| 97 // While there are no constraints in the GC code that HeapWordSize | |
| 98 // be any particular value, there are multiple other areas in the | |
| 99 // system which believe this to be true (e.g. oop->object_size in some | |
| 100 // cases incorrectly returns the size in wordSize units rather than | |
| 101 // HeapWordSize). | |
| 102 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 103 | |
| 104 // The heap must be at least as aligned as generations. | |
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105 size_t gen_alignment = Generation::GenGrain; |
| 0 | 106 |
| 107 _gen_specs = gen_policy()->generations(); | |
| 108 | |
| 109 // Make sure the sizes are all aligned. | |
| 110 for (i = 0; i < _n_gens; i++) { | |
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111 _gen_specs[i]->align(gen_alignment); |
| 0 | 112 } |
| 113 | |
| 114 // Allocate space for the heap. | |
| 115 | |
| 116 char* heap_address; | |
| 117 size_t total_reserved = 0; | |
| 118 int n_covered_regions = 0; | |
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119 ReservedSpace heap_rs; |
| 0 | 120 |
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121 size_t heap_alignment = collector_policy()->heap_alignment(); |
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122 |
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123 heap_address = allocate(heap_alignment, &total_reserved, |
| 0 | 124 &n_covered_regions, &heap_rs); |
| 125 | |
| 126 if (!heap_rs.is_reserved()) { | |
| 127 vm_shutdown_during_initialization( | |
| 128 "Could not reserve enough space for object heap"); | |
| 129 return JNI_ENOMEM; | |
| 130 } | |
| 131 | |
| 132 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 133 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 134 | |
| 135 // It is important to do this in a way such that concurrent readers can't | |
| 136 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
| 137 _reserved.set_word_size(0); | |
| 138 _reserved.set_start((HeapWord*)heap_rs.base()); | |
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139 size_t actual_heap_size = heap_rs.size(); |
| 0 | 140 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
| 141 | |
| 142 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
| 143 set_barrier_set(rem_set()->bs()); | |
| 1166 | 144 |
| 0 | 145 _gch = this; |
| 146 | |
| 147 for (i = 0; i < _n_gens; i++) { | |
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148 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
| 0 | 149 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
| 150 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
| 151 } | |
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152 clear_incremental_collection_failed(); |
| 0 | 153 |
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154 #if INCLUDE_ALL_GCS |
| 0 | 155 // If we are running CMS, create the collector responsible |
| 156 // for collecting the CMS generations. | |
| 157 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
| 158 bool success = create_cms_collector(); | |
| 159 if (!success) return JNI_ENOMEM; | |
| 160 } | |
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161 #endif // INCLUDE_ALL_GCS |
| 0 | 162 |
| 163 return JNI_OK; | |
| 164 } | |
| 165 | |
| 166 | |
| 167 char* GenCollectedHeap::allocate(size_t alignment, | |
| 168 size_t* _total_reserved, | |
| 169 int* _n_covered_regions, | |
| 170 ReservedSpace* heap_rs){ | |
| 171 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
| 172 "the maximum representable size"; | |
| 173 | |
| 174 // Now figure out the total size. | |
| 175 size_t total_reserved = 0; | |
| 176 int n_covered_regions = 0; | |
| 177 const size_t pageSize = UseLargePages ? | |
| 178 os::large_page_size() : os::vm_page_size(); | |
| 179 | |
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180 assert(alignment % pageSize == 0, "Must be"); |
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181 |
| 0 | 182 for (int i = 0; i < _n_gens; i++) { |
| 183 total_reserved += _gen_specs[i]->max_size(); | |
| 184 if (total_reserved < _gen_specs[i]->max_size()) { | |
| 185 vm_exit_during_initialization(overflow_msg); | |
| 186 } | |
| 187 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
| 188 } | |
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189 assert(total_reserved % alignment == 0, |
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190 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", alignment=" |
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191 SIZE_FORMAT, total_reserved, alignment)); |
| 0 | 192 |
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193 // Needed until the cardtable is fixed to have the right number |
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194 // of covered regions. |
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195 n_covered_regions += 2; |
| 0 | 196 |
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197 *_total_reserved = total_reserved; |
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198 *_n_covered_regions = n_covered_regions; |
| 0 | 199 |
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200 *heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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201 return heap_rs->base(); |
| 0 | 202 } |
| 203 | |
| 204 | |
| 205 void GenCollectedHeap::post_initialize() { | |
| 206 SharedHeap::post_initialize(); | |
| 207 TwoGenerationCollectorPolicy *policy = | |
| 208 (TwoGenerationCollectorPolicy *)collector_policy(); | |
| 209 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
| 210 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
| 211 assert(def_new_gen->kind() == Generation::DefNew || | |
| 212 def_new_gen->kind() == Generation::ParNew || | |
| 213 def_new_gen->kind() == Generation::ASParNew, | |
| 214 "Wrong generation kind"); | |
| 215 | |
| 216 Generation* old_gen = get_gen(1); | |
| 217 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
| 218 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
| 219 old_gen->kind() == Generation::MarkSweepCompact, | |
| 220 "Wrong generation kind"); | |
| 221 | |
| 222 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
| 223 old_gen->capacity(), | |
| 224 def_new_gen->from()->capacity()); | |
| 225 policy->initialize_gc_policy_counters(); | |
| 226 } | |
| 227 | |
| 228 void GenCollectedHeap::ref_processing_init() { | |
| 229 SharedHeap::ref_processing_init(); | |
| 230 for (int i = 0; i < _n_gens; i++) { | |
| 231 _gens[i]->ref_processor_init(); | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 size_t GenCollectedHeap::capacity() const { | |
| 236 size_t res = 0; | |
| 237 for (int i = 0; i < _n_gens; i++) { | |
| 238 res += _gens[i]->capacity(); | |
| 239 } | |
| 240 return res; | |
| 241 } | |
| 242 | |
| 243 size_t GenCollectedHeap::used() const { | |
| 244 size_t res = 0; | |
| 245 for (int i = 0; i < _n_gens; i++) { | |
| 246 res += _gens[i]->used(); | |
| 247 } | |
| 248 return res; | |
| 249 } | |
| 250 | |
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251 // Save the "used_region" for generations level and lower. |
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252 void GenCollectedHeap::save_used_regions(int level) { |
| 0 | 253 assert(level < _n_gens, "Illegal level parameter"); |
| 254 for (int i = level; i >= 0; i--) { | |
| 255 _gens[i]->save_used_region(); | |
| 256 } | |
| 257 } | |
| 258 | |
| 259 size_t GenCollectedHeap::max_capacity() const { | |
| 260 size_t res = 0; | |
| 261 for (int i = 0; i < _n_gens; i++) { | |
| 262 res += _gens[i]->max_capacity(); | |
| 263 } | |
| 264 return res; | |
| 265 } | |
| 266 | |
| 267 // Update the _full_collections_completed counter | |
| 268 // at the end of a stop-world full GC. | |
| 269 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
| 270 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 271 assert(_full_collections_completed <= _total_full_collections, | |
| 272 "Can't complete more collections than were started"); | |
| 273 _full_collections_completed = _total_full_collections; | |
| 274 ml.notify_all(); | |
| 275 return _full_collections_completed; | |
| 276 } | |
| 277 | |
| 278 // Update the _full_collections_completed counter, as appropriate, | |
| 279 // at the end of a concurrent GC cycle. Note the conditional update | |
| 280 // below to allow this method to be called by a concurrent collector | |
| 281 // without synchronizing in any manner with the VM thread (which | |
| 282 // may already have initiated a STW full collection "concurrently"). | |
| 283 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
| 284 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 285 assert((_full_collections_completed <= _total_full_collections) && | |
| 286 (count <= _total_full_collections), | |
| 287 "Can't complete more collections than were started"); | |
| 288 if (count > _full_collections_completed) { | |
| 289 _full_collections_completed = count; | |
| 290 ml.notify_all(); | |
| 291 } | |
| 292 return _full_collections_completed; | |
| 293 } | |
| 294 | |
| 295 | |
| 296 #ifndef PRODUCT | |
| 297 // Override of memory state checking method in CollectedHeap: | |
| 298 // Some collectors (CMS for example) can't have badHeapWordVal written | |
| 299 // in the first two words of an object. (For instance , in the case of | |
| 300 // CMS these words hold state used to synchronize between certain | |
| 301 // (concurrent) GC steps and direct allocating mutators.) | |
| 302 // The skip_header_HeapWords() method below, allows us to skip | |
| 303 // over the requisite number of HeapWord's. Note that (for | |
| 304 // generational collectors) this means that those many words are | |
| 305 // skipped in each object, irrespective of the generation in which | |
| 306 // that object lives. The resultant loss of precision seems to be | |
| 307 // harmless and the pain of avoiding that imprecision appears somewhat | |
| 308 // higher than we are prepared to pay for such rudimentary debugging | |
| 309 // support. | |
| 310 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
| 311 size_t size) { | |
| 312 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
| 313 // We are asked to check a size in HeapWords, | |
| 314 // but the memory is mangled in juint words. | |
| 315 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
| 316 juint* end = (juint*) (addr + size); | |
| 317 for (juint* slot = start; slot < end; slot += 1) { | |
| 318 assert(*slot == badHeapWordVal, | |
| 319 "Found non badHeapWordValue in pre-allocation check"); | |
| 320 } | |
| 321 } | |
| 322 } | |
| 323 #endif | |
| 324 | |
| 325 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
| 326 bool is_tlab, | |
| 327 bool first_only) { | |
| 328 HeapWord* res; | |
| 329 for (int i = 0; i < _n_gens; i++) { | |
| 330 if (_gens[i]->should_allocate(size, is_tlab)) { | |
| 331 res = _gens[i]->allocate(size, is_tlab); | |
| 332 if (res != NULL) return res; | |
| 333 else if (first_only) break; | |
| 334 } | |
| 335 } | |
| 336 // Otherwise... | |
| 337 return NULL; | |
| 338 } | |
| 339 | |
| 340 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
| 341 bool* gc_overhead_limit_was_exceeded) { | |
| 342 return collector_policy()->mem_allocate_work(size, | |
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343 false /* is_tlab */, |
| 0 | 344 gc_overhead_limit_was_exceeded); |
| 345 } | |
| 346 | |
| 347 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
| 348 return _gc_cause == GCCause::_last_ditch_collection; | |
| 349 } | |
| 350 | |
| 351 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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352 return UseConcMarkSweepGC && |
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353 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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354 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
| 0 | 355 } |
| 356 | |
| 357 void GenCollectedHeap::do_collection(bool full, | |
| 358 bool clear_all_soft_refs, | |
| 359 size_t size, | |
| 360 bool is_tlab, | |
| 361 int max_level) { | |
| 362 bool prepared_for_verification = false; | |
| 363 ResourceMark rm; | |
| 364 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
| 365 | |
| 366 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 367 assert(my_thread->is_VM_thread() || | |
| 368 my_thread->is_ConcurrentGC_thread(), | |
| 369 "incorrect thread type capability"); | |
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370 assert(Heap_lock->is_locked(), |
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371 "the requesting thread should have the Heap_lock"); |
| 0 | 372 guarantee(!is_gc_active(), "collection is not reentrant"); |
| 373 assert(max_level < n_gens(), "sanity check"); | |
| 374 | |
| 375 if (GC_locker::check_active_before_gc()) { | |
| 376 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 377 } | |
| 378 | |
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379 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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380 collector_policy()->should_clear_all_soft_refs(); |
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381 |
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382 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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383 |
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384 const size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
| 0 | 385 |
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386 print_heap_before_gc(); |
| 0 | 387 |
| 388 { | |
| 389 FlagSetting fl(_is_gc_active, true); | |
| 390 | |
| 391 bool complete = full && (max_level == (n_gens()-1)); | |
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392 const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
| 0 | 393 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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394 // The PrintGCDetails logging starts before we have incremented the GC id. We will do that later |
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395 // so we can assume here that the next GC id is what we want. |
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396 GCTraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, NULL, GCId::peek()); |
| 0 | 397 |
| 398 gc_prologue(complete); | |
| 399 increment_total_collections(complete); | |
| 400 | |
| 401 size_t gch_prev_used = used(); | |
| 402 | |
| 403 int starting_level = 0; | |
| 404 if (full) { | |
| 405 // Search for the oldest generation which will collect all younger | |
| 406 // generations, and start collection loop there. | |
| 407 for (int i = max_level; i >= 0; i--) { | |
| 408 if (_gens[i]->full_collects_younger_generations()) { | |
| 409 starting_level = i; | |
| 410 break; | |
| 411 } | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 bool must_restore_marks_for_biased_locking = false; | |
| 416 | |
| 417 int max_level_collected = starting_level; | |
| 418 for (int i = starting_level; i <= max_level; i++) { | |
| 419 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
|
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420 if (i == n_gens() - 1) { // a major collection is to happen |
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421 if (!complete) { |
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422 // The full_collections increment was missed above. |
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423 increment_total_full_collections(); |
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424 } |
| 10405 | 425 pre_full_gc_dump(NULL); // do any pre full gc dumps |
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426 } |
| 0 | 427 // Timer for individual generations. Last argument is false: no CR |
| 10405 | 428 // FIXME: We should try to start the timing earlier to cover more of the GC pause |
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429 // The PrintGCDetails logging starts before we have incremented the GC id. We will do that later |
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430 // so we can assume here that the next GC id is what we want. |
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431 GCTraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, NULL, GCId::peek()); |
| 0 | 432 TraceCollectorStats tcs(_gens[i]->counters()); |
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433 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
| 0 | 434 |
| 435 size_t prev_used = _gens[i]->used(); | |
| 436 _gens[i]->stat_record()->invocations++; | |
| 437 _gens[i]->stat_record()->accumulated_time.start(); | |
| 438 | |
|
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439 // Must be done anew before each collection because |
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440 // a previous collection will do mangling and will |
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441 // change top of some spaces. |
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442 record_gen_tops_before_GC(); |
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443 |
| 0 | 444 if (PrintGC && Verbose) { |
| 445 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
| 446 i, | |
| 447 _gens[i]->stat_record()->invocations, | |
| 448 size*HeapWordSize); | |
| 449 } | |
| 450 | |
| 451 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
| 452 total_collections() >= VerifyGCStartAt) { | |
| 453 HandleMark hm; // Discard invalid handles created during verification | |
| 454 if (!prepared_for_verification) { | |
| 455 prepare_for_verify(); | |
| 456 prepared_for_verification = true; | |
| 457 } | |
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458 Universe::verify(" VerifyBeforeGC:"); |
| 0 | 459 } |
| 22298 | 460 #if defined(COMPILER2) || INCLUDE_JVMCI |
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461 DerivedPointerTable::clear(); |
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462 #endif |
| 0 | 463 |
| 464 if (!must_restore_marks_for_biased_locking && | |
| 465 _gens[i]->performs_in_place_marking()) { | |
| 466 // We perform this mark word preservation work lazily | |
| 467 // because it's only at this point that we know whether we | |
| 468 // absolutely have to do it; we want to avoid doing it for | |
| 469 // scavenge-only collections where it's unnecessary | |
| 470 must_restore_marks_for_biased_locking = true; | |
| 471 BiasedLocking::preserve_marks(); | |
| 472 } | |
| 473 | |
| 474 // Do collection work | |
| 475 { | |
| 476 // Note on ref discovery: For what appear to be historical reasons, | |
| 477 // GCH enables and disabled (by enqueing) refs discovery. | |
| 478 // In the future this should be moved into the generation's | |
| 479 // collect method so that ref discovery and enqueueing concerns | |
| 480 // are local to a generation. The collect method could return | |
| 481 // an appropriate indication in the case that notification on | |
| 482 // the ref lock was needed. This will make the treatment of | |
| 483 // weak refs more uniform (and indeed remove such concerns | |
| 484 // from GCH). XXX | |
| 485 | |
| 486 HandleMark hm; // Discard invalid handles created during gc | |
| 487 save_marks(); // save marks for all gens | |
| 488 // We want to discover references, but not process them yet. | |
| 489 // This mode is disabled in process_discovered_references if the | |
| 490 // generation does some collection work, or in | |
| 491 // enqueue_discovered_references if the generation returns | |
| 492 // without doing any work. | |
| 493 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
| 494 // If the discovery of ("weak") refs in this generation is | |
| 495 // atomic wrt other collectors in this configuration, we | |
| 496 // are guaranteed to have empty discovered ref lists. | |
| 497 if (rp->discovery_is_atomic()) { | |
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498 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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499 rp->setup_policy(do_clear_all_soft_refs); |
| 0 | 500 } else { |
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501 // collect() below will enable discovery as appropriate |
| 0 | 502 } |
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503 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
| 0 | 504 if (!rp->enqueuing_is_done()) { |
| 505 rp->enqueue_discovered_references(); | |
| 506 } else { | |
| 507 rp->set_enqueuing_is_done(false); | |
| 508 } | |
| 509 rp->verify_no_references_recorded(); | |
| 510 } | |
| 511 max_level_collected = i; | |
| 512 | |
| 513 // Determine if allocation request was met. | |
| 514 if (size > 0) { | |
| 515 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
| 516 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
| 517 size = 0; | |
| 518 } | |
| 519 } | |
| 520 } | |
| 521 | |
| 22298 | 522 #if defined(COMPILER2) || INCLUDE_JVMCI |
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523 DerivedPointerTable::update_pointers(); |
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524 #endif |
| 0 | 525 |
| 526 _gens[i]->stat_record()->accumulated_time.stop(); | |
| 527 | |
| 528 update_gc_stats(i, full); | |
| 529 | |
| 530 if (VerifyAfterGC && i >= VerifyGCLevel && | |
| 531 total_collections() >= VerifyGCStartAt) { | |
| 532 HandleMark hm; // Discard invalid handles created during verification | |
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533 Universe::verify(" VerifyAfterGC:"); |
| 0 | 534 } |
| 535 | |
| 536 if (PrintGCDetails) { | |
| 537 gclog_or_tty->print(":"); | |
| 538 _gens[i]->print_heap_change(prev_used); | |
| 539 } | |
| 540 } | |
| 541 } | |
| 542 | |
| 543 // Update "complete" boolean wrt what actually transpired -- | |
| 544 // for instance, a promotion failure could have led to | |
| 545 // a whole heap collection. | |
| 546 complete = complete || (max_level_collected == n_gens() - 1); | |
| 547 | |
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548 if (complete) { // We did a "major" collection |
| 10405 | 549 // FIXME: See comment at pre_full_gc_dump call |
| 550 post_full_gc_dump(NULL); // do any post full gc dumps | |
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551 } |
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552 |
| 0 | 553 if (PrintGCDetails) { |
| 554 print_heap_change(gch_prev_used); | |
| 555 | |
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556 // Print metaspace info for full GC with PrintGCDetails flag. |
| 0 | 557 if (complete) { |
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558 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
| 0 | 559 } |
| 560 } | |
| 561 | |
| 562 for (int j = max_level_collected; j >= 0; j -= 1) { | |
| 563 // Adjust generation sizes. | |
| 564 _gens[j]->compute_new_size(); | |
| 565 } | |
| 566 | |
| 567 if (complete) { | |
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568 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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569 ClassLoaderDataGraph::purge(); |
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570 MetaspaceAux::verify_metrics(); |
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571 // Resize the metaspace capacity after full collections |
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572 MetaspaceGC::compute_new_size(); |
| 0 | 573 update_full_collections_completed(); |
| 574 } | |
| 575 | |
| 576 // Track memory usage and detect low memory after GC finishes | |
| 577 MemoryService::track_memory_usage(); | |
| 578 | |
| 579 gc_epilogue(complete); | |
| 580 | |
| 581 if (must_restore_marks_for_biased_locking) { | |
| 582 BiasedLocking::restore_marks(); | |
| 583 } | |
| 584 } | |
| 585 | |
| 586 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
| 587 AdaptiveSizePolicyOutput(sp, total_collections()); | |
| 588 | |
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589 print_heap_after_gc(); |
| 0 | 590 |
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591 #ifdef TRACESPINNING |
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592 ParallelTaskTerminator::print_termination_counts(); |
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593 #endif |
| 0 | 594 } |
| 595 | |
| 596 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
| 597 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
| 598 } | |
| 599 | |
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600 void GenCollectedHeap::set_par_threads(uint t) { |
| 0 | 601 SharedHeap::set_par_threads(t); |
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602 set_n_termination(t); |
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603 } |
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604 |
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605 void GenCollectedHeap::set_n_termination(uint t) { |
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606 _process_strong_tasks->set_n_threads(t); |
| 0 | 607 } |
| 608 | |
|
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609 #ifdef ASSERT |
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610 class AssertNonScavengableClosure: public OopClosure { |
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611 public: |
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612 virtual void do_oop(oop* p) { |
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613 assert(!Universe::heap()->is_in_partial_collection(*p), |
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614 "Referent should not be scavengable."); } |
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615 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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616 }; |
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617 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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618 #endif |
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619 |
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620 void GenCollectedHeap::process_roots(bool activate_scope, |
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621 ScanningOption so, |
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622 OopClosure* strong_roots, |
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623 OopClosure* weak_roots, |
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624 CLDClosure* strong_cld_closure, |
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625 CLDClosure* weak_cld_closure, |
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626 CodeBlobClosure* code_roots) { |
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627 StrongRootsScope srs(this, activate_scope); |
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628 |
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629 // General roots. |
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630 assert(_strong_roots_parity != 0, "must have called prologue code"); |
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631 assert(code_roots != NULL, "code root closure should always be set"); |
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632 // _n_termination for _process_strong_tasks should be set up stream |
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633 // in a method not running in a GC worker. Otherwise the GC worker |
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634 // could be trying to change the termination condition while the task |
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635 // is executing in another GC worker. |
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636 |
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637 if (!_process_strong_tasks->is_task_claimed(GCH_PS_ClassLoaderDataGraph_oops_do)) { |
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638 ClassLoaderDataGraph::roots_cld_do(strong_cld_closure, weak_cld_closure); |
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639 } |
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640 |
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641 // Some CLDs contained in the thread frames should be considered strong. |
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642 // Don't process them if they will be processed during the ClassLoaderDataGraph phase. |
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643 CLDClosure* roots_from_clds_p = (strong_cld_closure != weak_cld_closure) ? strong_cld_closure : NULL; |
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644 // Only process code roots from thread stacks if we aren't visiting the entire CodeCache anyway |
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645 CodeBlobClosure* roots_from_code_p = (so & SO_AllCodeCache) ? NULL : code_roots; |
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646 |
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647 Threads::possibly_parallel_oops_do(strong_roots, roots_from_clds_p, roots_from_code_p); |
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648 |
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649 if (!_process_strong_tasks->is_task_claimed(GCH_PS_Universe_oops_do)) { |
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650 Universe::oops_do(strong_roots); |
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651 } |
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652 // Global (strong) JNI handles |
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653 if (!_process_strong_tasks->is_task_claimed(GCH_PS_JNIHandles_oops_do)) { |
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654 JNIHandles::oops_do(strong_roots); |
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655 } |
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656 |
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657 if (!_process_strong_tasks->is_task_claimed(GCH_PS_ObjectSynchronizer_oops_do)) { |
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658 ObjectSynchronizer::oops_do(strong_roots); |
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659 } |
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660 if (!_process_strong_tasks->is_task_claimed(GCH_PS_FlatProfiler_oops_do)) { |
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661 FlatProfiler::oops_do(strong_roots); |
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662 } |
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663 if (!_process_strong_tasks->is_task_claimed(GCH_PS_Management_oops_do)) { |
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664 Management::oops_do(strong_roots); |
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665 } |
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666 if (!_process_strong_tasks->is_task_claimed(GCH_PS_jvmti_oops_do)) { |
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667 JvmtiExport::oops_do(strong_roots); |
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668 } |
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669 |
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670 if (!_process_strong_tasks->is_task_claimed(GCH_PS_SystemDictionary_oops_do)) { |
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671 SystemDictionary::roots_oops_do(strong_roots, weak_roots); |
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672 } |
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673 |
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674 // All threads execute the following. A specific chunk of buckets |
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675 // from the StringTable are the individual tasks. |
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676 if (weak_roots != NULL) { |
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677 if (CollectedHeap::use_parallel_gc_threads()) { |
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678 StringTable::possibly_parallel_oops_do(weak_roots); |
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679 } else { |
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680 StringTable::oops_do(weak_roots); |
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681 } |
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682 } |
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683 |
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684 if (!_process_strong_tasks->is_task_claimed(GCH_PS_CodeCache_oops_do)) { |
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685 if (so & SO_ScavengeCodeCache) { |
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686 assert(code_roots != NULL, "must supply closure for code cache"); |
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687 |
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688 // We only visit parts of the CodeCache when scavenging. |
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689 CodeCache::scavenge_root_nmethods_do(code_roots); |
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690 } |
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691 if (so & SO_AllCodeCache) { |
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692 assert(code_roots != NULL, "must supply closure for code cache"); |
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693 |
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694 // CMSCollector uses this to do intermediate-strength collections. |
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695 // We scan the entire code cache, since CodeCache::do_unloading is not called. |
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696 CodeCache::blobs_do(code_roots); |
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697 } |
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698 // Verify that the code cache contents are not subject to |
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699 // movement by a scavenging collection. |
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700 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, !CodeBlobToOopClosure::FixRelocations)); |
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701 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
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702 } |
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703 |
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704 } |
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705 |
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706 void GenCollectedHeap::gen_process_roots(int level, |
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707 bool younger_gens_as_roots, |
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708 bool activate_scope, |
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709 ScanningOption so, |
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710 bool only_strong_roots, |
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711 OopsInGenClosure* not_older_gens, |
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712 OopsInGenClosure* older_gens, |
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713 CLDClosure* cld_closure) { |
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714 const bool is_adjust_phase = !only_strong_roots && !younger_gens_as_roots; |
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715 |
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716 bool is_moving_collection = false; |
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717 if (level == 0 || is_adjust_phase) { |
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718 // young collections are always moving |
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719 is_moving_collection = true; |
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720 } |
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721 |
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722 MarkingCodeBlobClosure mark_code_closure(not_older_gens, is_moving_collection); |
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723 OopsInGenClosure* weak_roots = only_strong_roots ? NULL : not_older_gens; |
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724 CLDClosure* weak_cld_closure = only_strong_roots ? NULL : cld_closure; |
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725 |
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726 process_roots(activate_scope, so, |
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727 not_older_gens, weak_roots, |
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728 cld_closure, weak_cld_closure, |
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729 &mark_code_closure); |
| 0 | 730 |
| 731 if (younger_gens_as_roots) { | |
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732 if (!_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { |
| 0 | 733 for (int i = 0; i < level; i++) { |
| 734 not_older_gens->set_generation(_gens[i]); | |
| 735 _gens[i]->oop_iterate(not_older_gens); | |
| 736 } | |
| 737 not_older_gens->reset_generation(); | |
| 738 } | |
| 739 } | |
| 740 // When collection is parallel, all threads get to cooperate to do | |
| 741 // older-gen scanning. | |
| 742 for (int i = level+1; i < _n_gens; i++) { | |
| 743 older_gens->set_generation(_gens[i]); | |
| 744 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
| 745 older_gens->reset_generation(); | |
| 746 } | |
| 747 | |
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748 _process_strong_tasks->all_tasks_completed(); |
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749 } |
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750 |
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751 |
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752 class AlwaysTrueClosure: public BoolObjectClosure { |
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753 public: |
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754 bool do_object_b(oop p) { return true; } |
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755 }; |
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756 static AlwaysTrueClosure always_true; |
| 0 | 757 |
|
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758 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure) { |
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759 JNIHandles::weak_oops_do(&always_true, root_closure); |
| 0 | 760 for (int i = 0; i < _n_gens; i++) { |
| 761 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
| 762 } | |
| 763 } | |
| 764 | |
| 765 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 766 void GenCollectedHeap:: \ | |
| 767 oop_since_save_marks_iterate(int level, \ | |
| 768 OopClosureType* cur, \ | |
| 769 OopClosureType* older) { \ | |
| 770 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
| 771 for (int i = level+1; i < n_gens(); i++) { \ | |
| 772 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 773 } \ | |
| 774 } | |
| 775 | |
| 776 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 777 | |
| 778 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 779 | |
| 780 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
| 781 for (int i = level; i < _n_gens; i++) { | |
| 782 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
| 783 } | |
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784 return true; |
| 0 | 785 } |
| 786 | |
| 787 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
| 788 return _gens[0]->supports_inline_contig_alloc(); | |
| 789 } | |
| 790 | |
| 791 HeapWord** GenCollectedHeap::top_addr() const { | |
| 792 return _gens[0]->top_addr(); | |
| 793 } | |
| 794 | |
| 795 HeapWord** GenCollectedHeap::end_addr() const { | |
| 796 return _gens[0]->end_addr(); | |
| 797 } | |
| 798 | |
| 799 // public collection interfaces | |
| 800 | |
| 801 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
| 802 if (should_do_concurrent_full_gc(cause)) { | |
|
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803 #if INCLUDE_ALL_GCS |
| 0 | 804 // mostly concurrent full collection |
| 805 collect_mostly_concurrent(cause); | |
|
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806 #else // INCLUDE_ALL_GCS |
| 0 | 807 ShouldNotReachHere(); |
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808 #endif // INCLUDE_ALL_GCS |
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809 } else if (cause == GCCause::_wb_young_gc) { |
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810 // minor collection for WhiteBox API |
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811 collect(cause, 0); |
| 0 | 812 } else { |
| 813 #ifdef ASSERT | |
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814 if (cause == GCCause::_scavenge_alot) { |
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815 // minor collection only |
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816 collect(cause, 0); |
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817 } else { |
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818 // Stop-the-world full collection |
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819 collect(cause, n_gens() - 1); |
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820 } |
| 0 | 821 #else |
| 822 // Stop-the-world full collection | |
| 823 collect(cause, n_gens() - 1); | |
| 824 #endif | |
| 825 } | |
| 826 } | |
| 827 | |
| 828 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
| 829 // The caller doesn't have the Heap_lock | |
| 830 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 831 MutexLocker ml(Heap_lock); | |
| 832 collect_locked(cause, max_level); | |
| 833 } | |
| 834 | |
| 835 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 836 // The caller has the Heap_lock | |
| 837 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
| 838 collect_locked(cause, n_gens() - 1); | |
| 839 } | |
| 840 | |
| 841 // this is the private collection interface | |
| 842 // The Heap_lock is expected to be held on entry. | |
| 843 | |
| 844 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
| 845 // Read the GC count while holding the Heap_lock | |
| 846 unsigned int gc_count_before = total_collections(); | |
| 847 unsigned int full_gc_count_before = total_full_collections(); | |
| 848 { | |
| 849 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 850 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
| 851 cause, max_level); | |
| 852 VMThread::execute(&op); | |
| 853 } | |
| 854 } | |
| 855 | |
|
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856 #if INCLUDE_ALL_GCS |
| 0 | 857 bool GenCollectedHeap::create_cms_collector() { |
| 858 | |
| 859 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
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860 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)), |
| 0 | 861 "Unexpected generation kinds"); |
| 862 // Skip two header words in the block content verification | |
| 863 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
| 864 CMSCollector* collector = new CMSCollector( | |
| 865 (ConcurrentMarkSweepGeneration*)_gens[1], | |
| 866 _rem_set->as_CardTableRS(), | |
| 867 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
| 868 | |
| 869 if (collector == NULL || !collector->completed_initialization()) { | |
| 870 if (collector) { | |
| 871 delete collector; // Be nice in embedded situation | |
| 872 } | |
| 873 vm_shutdown_during_initialization("Could not create CMS collector"); | |
| 874 return false; | |
| 875 } | |
| 876 return true; // success | |
| 877 } | |
| 878 | |
| 879 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
| 880 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
| 881 | |
| 882 MutexLocker ml(Heap_lock); | |
| 883 // Read the GC counts while holding the Heap_lock | |
| 884 unsigned int full_gc_count_before = total_full_collections(); | |
| 885 unsigned int gc_count_before = total_collections(); | |
| 886 { | |
| 887 MutexUnlocker mu(Heap_lock); | |
| 888 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
| 889 VMThread::execute(&op); | |
| 890 } | |
| 891 } | |
|
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892 #endif // INCLUDE_ALL_GCS |
| 0 | 893 |
|
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894 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
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895 do_full_collection(clear_all_soft_refs, _n_gens - 1); |
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896 } |
| 0 | 897 |
| 898 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
| 899 int max_level) { | |
| 900 int local_max_level; | |
|
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901 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
| 0 | 902 gc_cause() == GCCause::_gc_locker) { |
| 903 local_max_level = 0; | |
| 904 } else { | |
| 905 local_max_level = max_level; | |
| 906 } | |
| 907 | |
| 908 do_collection(true /* full */, | |
| 909 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 910 0 /* size */, | |
| 911 false /* is_tlab */, | |
| 912 local_max_level /* max_level */); | |
| 913 // Hack XXX FIX ME !!! | |
| 914 // A scavenge may not have been attempted, or may have | |
| 915 // been attempted and failed, because the old gen was too full | |
| 916 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
|
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917 incremental_collection_will_fail(false /* don't consult_young */)) { |
| 0 | 918 if (PrintGCDetails) { |
| 919 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
| 920 "because scavenge failed"); | |
| 921 } | |
| 922 // This time allow the old gen to be collected as well | |
| 923 do_collection(true /* full */, | |
| 924 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 925 0 /* size */, | |
| 926 false /* is_tlab */, | |
| 927 n_gens() - 1 /* max_level */); | |
| 928 } | |
| 929 } | |
| 930 | |
|
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931 bool GenCollectedHeap::is_in_young(oop p) { |
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932 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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933 assert(result == _gens[0]->is_in_reserved(p), |
|
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934 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, p2i((void*)p))); |
|
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935 return result; |
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936 } |
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937 |
| 4708 | 938 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 0 | 939 bool GenCollectedHeap::is_in(const void* p) const { |
| 940 #ifndef ASSERT | |
|
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941 guarantee(VerifyBeforeGC || |
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942 VerifyDuringGC || |
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943 VerifyBeforeExit || |
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944 VerifyDuringStartup || |
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945 PrintAssembly || |
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946 tty->count() != 0 || // already printing |
|
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947 VerifyAfterGC || |
|
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948 VMError::fatal_error_in_progress(), "too expensive"); |
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949 |
| 0 | 950 #endif |
| 951 // This might be sped up with a cache of the last generation that | |
| 952 // answered yes. | |
| 953 for (int i = 0; i < _n_gens; i++) { | |
| 954 if (_gens[i]->is_in(p)) return true; | |
| 955 } | |
| 956 // Otherwise... | |
| 957 return false; | |
| 958 } | |
| 959 | |
|
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960 #ifdef ASSERT |
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961 // Don't implement this by using is_in_young(). This method is used |
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962 // in some cases to check that is_in_young() is correct. |
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963 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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964 assert(is_in_reserved(p) || p == NULL, |
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965 "Does not work if address is non-null and outside of the heap"); |
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966 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
| 0 | 967 } |
|
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968 #endif |
| 0 | 969 |
|
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970 void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 971 for (int i = 0; i < _n_gens; i++) { |
| 972 _gens[i]->oop_iterate(cl); | |
| 973 } | |
| 974 } | |
| 975 | |
| 976 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 977 for (int i = 0; i < _n_gens; i++) { | |
| 978 _gens[i]->object_iterate(cl); | |
| 979 } | |
| 980 } | |
| 981 | |
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982 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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983 for (int i = 0; i < _n_gens; i++) { |
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984 _gens[i]->safe_object_iterate(cl); |
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985 } |
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986 } |
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987 |
| 0 | 988 Space* GenCollectedHeap::space_containing(const void* addr) const { |
| 989 for (int i = 0; i < _n_gens; i++) { | |
| 990 Space* res = _gens[i]->space_containing(addr); | |
| 991 if (res != NULL) return res; | |
| 992 } | |
| 993 // Otherwise... | |
| 994 assert(false, "Could not find containing space"); | |
| 995 return NULL; | |
| 996 } | |
| 997 | |
| 998 | |
| 999 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
| 1000 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
| 1001 for (int i = 0; i < _n_gens; i++) { | |
| 1002 if (_gens[i]->is_in_reserved(addr)) { | |
| 1003 assert(_gens[i]->is_in(addr), | |
| 1004 "addr should be in allocated part of generation"); | |
| 1005 return _gens[i]->block_start(addr); | |
| 1006 } | |
| 1007 } | |
| 1008 assert(false, "Some generation should contain the address"); | |
| 1009 return NULL; | |
| 1010 } | |
| 1011 | |
| 1012 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
| 1013 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
| 1014 for (int i = 0; i < _n_gens; i++) { | |
| 1015 if (_gens[i]->is_in_reserved(addr)) { | |
| 1016 assert(_gens[i]->is_in(addr), | |
| 1017 "addr should be in allocated part of generation"); | |
| 1018 return _gens[i]->block_size(addr); | |
| 1019 } | |
| 1020 } | |
| 1021 assert(false, "Some generation should contain the address"); | |
| 1022 return 0; | |
| 1023 } | |
| 1024 | |
| 1025 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 1026 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
| 1027 assert(block_start(addr) == addr, "addr must be a block start"); | |
| 1028 for (int i = 0; i < _n_gens; i++) { | |
| 1029 if (_gens[i]->is_in_reserved(addr)) { | |
| 1030 return _gens[i]->block_is_obj(addr); | |
| 1031 } | |
| 1032 } | |
| 1033 assert(false, "Some generation should contain the address"); | |
| 1034 return false; | |
| 1035 } | |
| 1036 | |
| 1037 bool GenCollectedHeap::supports_tlab_allocation() const { | |
| 1038 for (int i = 0; i < _n_gens; i += 1) { | |
| 1039 if (_gens[i]->supports_tlab_allocation()) { | |
| 1040 return true; | |
| 1041 } | |
| 1042 } | |
| 1043 return false; | |
| 1044 } | |
| 1045 | |
| 1046 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
| 1047 size_t result = 0; | |
| 1048 for (int i = 0; i < _n_gens; i += 1) { | |
| 1049 if (_gens[i]->supports_tlab_allocation()) { | |
| 1050 result += _gens[i]->tlab_capacity(); | |
| 1051 } | |
| 1052 } | |
| 1053 return result; | |
| 1054 } | |
| 1055 | |
| 17727 | 1056 size_t GenCollectedHeap::tlab_used(Thread* thr) const { |
| 1057 size_t result = 0; | |
| 1058 for (int i = 0; i < _n_gens; i += 1) { | |
| 1059 if (_gens[i]->supports_tlab_allocation()) { | |
| 1060 result += _gens[i]->tlab_used(); | |
| 1061 } | |
| 1062 } | |
| 1063 return result; | |
| 1064 } | |
| 1065 | |
| 0 | 1066 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
| 1067 size_t result = 0; | |
| 1068 for (int i = 0; i < _n_gens; i += 1) { | |
| 1069 if (_gens[i]->supports_tlab_allocation()) { | |
| 1070 result += _gens[i]->unsafe_max_tlab_alloc(); | |
| 1071 } | |
| 1072 } | |
| 1073 return result; | |
| 1074 } | |
| 1075 | |
| 1076 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
| 1077 bool gc_overhead_limit_was_exceeded; | |
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1078 return collector_policy()->mem_allocate_work(size /* size */, |
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1079 true /* is_tlab */, |
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1080 &gc_overhead_limit_was_exceeded); |
| 0 | 1081 } |
| 1082 | |
| 1083 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
| 1084 // from the list headed by "*prev_ptr". | |
| 1085 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
| 1086 bool first = true; | |
| 1087 size_t min_size = 0; // "first" makes this conceptually infinite. | |
| 1088 ScratchBlock **smallest_ptr, *smallest; | |
| 1089 ScratchBlock *cur = *prev_ptr; | |
| 1090 while (cur) { | |
| 1091 assert(*prev_ptr == cur, "just checking"); | |
| 1092 if (first || cur->num_words < min_size) { | |
| 1093 smallest_ptr = prev_ptr; | |
| 1094 smallest = cur; | |
| 1095 min_size = smallest->num_words; | |
| 1096 first = false; | |
| 1097 } | |
| 1098 prev_ptr = &cur->next; | |
| 1099 cur = cur->next; | |
| 1100 } | |
| 1101 smallest = *smallest_ptr; | |
| 1102 *smallest_ptr = smallest->next; | |
| 1103 return smallest; | |
| 1104 } | |
| 1105 | |
| 1106 // Sort the scratch block list headed by res into decreasing size order, | |
| 1107 // and set "res" to the result. | |
| 1108 static void sort_scratch_list(ScratchBlock*& list) { | |
| 1109 ScratchBlock* sorted = NULL; | |
| 1110 ScratchBlock* unsorted = list; | |
| 1111 while (unsorted) { | |
| 1112 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
| 1113 smallest->next = sorted; | |
| 1114 sorted = smallest; | |
| 1115 } | |
| 1116 list = sorted; | |
| 1117 } | |
| 1118 | |
| 1119 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
| 1120 size_t max_alloc_words) { | |
| 1121 ScratchBlock* res = NULL; | |
| 1122 for (int i = 0; i < _n_gens; i++) { | |
| 1123 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
| 1124 } | |
| 1125 sort_scratch_list(res); | |
| 1126 return res; | |
| 1127 } | |
| 1128 | |
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1129 void GenCollectedHeap::release_scratch() { |
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1130 for (int i = 0; i < _n_gens; i++) { |
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1131 _gens[i]->reset_scratch(); |
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1132 } |
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1133 } |
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1134 |
| 0 | 1135 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
| 1136 void do_generation(Generation* gen) { | |
| 1137 gen->prepare_for_verify(); | |
| 1138 } | |
| 1139 }; | |
| 1140 | |
| 1141 void GenCollectedHeap::prepare_for_verify() { | |
| 1142 ensure_parsability(false); // no need to retire TLABs | |
| 1143 GenPrepareForVerifyClosure blk; | |
| 1144 generation_iterate(&blk, false); | |
| 1145 } | |
| 1146 | |
| 1147 | |
| 1148 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
| 1149 bool old_to_young) { | |
| 1150 if (old_to_young) { | |
| 1151 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1152 cl->do_generation(_gens[i]); | |
| 1153 } | |
| 1154 } else { | |
| 1155 for (int i = 0; i < _n_gens; i++) { | |
| 1156 cl->do_generation(_gens[i]); | |
| 1157 } | |
| 1158 } | |
| 1159 } | |
| 1160 | |
| 1161 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1162 for (int i = 0; i < _n_gens; i++) { | |
| 1163 _gens[i]->space_iterate(cl, true); | |
| 1164 } | |
| 1165 } | |
| 1166 | |
| 1167 bool GenCollectedHeap::is_maximal_no_gc() const { | |
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1168 for (int i = 0; i < _n_gens; i++) { |
| 0 | 1169 if (!_gens[i]->is_maximal_no_gc()) { |
| 1170 return false; | |
| 1171 } | |
| 1172 } | |
| 1173 return true; | |
| 1174 } | |
| 1175 | |
| 1176 void GenCollectedHeap::save_marks() { | |
| 1177 for (int i = 0; i < _n_gens; i++) { | |
| 1178 _gens[i]->save_marks(); | |
| 1179 } | |
| 1180 } | |
| 1181 | |
| 1182 GenCollectedHeap* GenCollectedHeap::heap() { | |
| 1183 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
| 1184 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
| 1185 return _gch; | |
| 1186 } | |
| 1187 | |
| 1188 | |
| 1189 void GenCollectedHeap::prepare_for_compaction() { | |
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1190 guarantee(_n_gens = 2, "Wrong number of generations"); |
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1191 Generation* old_gen = _gens[1]; |
| 0 | 1192 // Start by compacting into same gen. |
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1193 CompactPoint cp(old_gen); |
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1194 old_gen->prepare_for_compaction(&cp); |
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1195 Generation* young_gen = _gens[0]; |
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1196 young_gen->prepare_for_compaction(&cp); |
| 0 | 1197 } |
| 1198 | |
| 1199 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
| 1200 return _gens[level]->gc_stats(); | |
| 1201 } | |
| 1202 | |
| 6008 | 1203 void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 1204 for (int i = _n_gens-1; i >= 0; i--) { |
| 1205 Generation* g = _gens[i]; | |
| 1206 if (!silent) { | |
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1207 gclog_or_tty->print("%s", g->name()); |
| 0 | 1208 gclog_or_tty->print(" "); |
| 1209 } | |
| 6008 | 1210 g->verify(); |
| 0 | 1211 } |
| 1212 if (!silent) { | |
| 1213 gclog_or_tty->print("remset "); | |
| 1214 } | |
| 1215 rem_set()->verify(); | |
| 1216 } | |
| 1217 | |
| 1218 void GenCollectedHeap::print_on(outputStream* st) const { | |
| 1219 for (int i = 0; i < _n_gens; i++) { | |
| 1220 _gens[i]->print_on(st); | |
| 1221 } | |
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1222 MetaspaceAux::print_on(st); |
| 0 | 1223 } |
| 1224 | |
| 1225 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 1226 if (workers() != NULL) { | |
| 1227 workers()->threads_do(tc); | |
| 1228 } | |
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1229 #if INCLUDE_ALL_GCS |
| 0 | 1230 if (UseConcMarkSweepGC) { |
| 1231 ConcurrentMarkSweepThread::threads_do(tc); | |
| 1232 } | |
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1233 #endif // INCLUDE_ALL_GCS |
| 0 | 1234 } |
| 1235 | |
| 1236 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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1237 #if INCLUDE_ALL_GCS |
| 0 | 1238 if (UseParNewGC) { |
| 1239 workers()->print_worker_threads_on(st); | |
| 1240 } | |
| 1241 if (UseConcMarkSweepGC) { | |
| 1242 ConcurrentMarkSweepThread::print_all_on(st); | |
| 1243 } | |
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1244 #endif // INCLUDE_ALL_GCS |
| 0 | 1245 } |
| 1246 | |
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1247 void GenCollectedHeap::print_on_error(outputStream* st) const { |
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1248 this->CollectedHeap::print_on_error(st); |
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1249 |
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1250 #if INCLUDE_ALL_GCS |
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1251 if (UseConcMarkSweepGC) { |
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1252 st->cr(); |
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1253 CMSCollector::print_on_error(st); |
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1254 } |
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1255 #endif // INCLUDE_ALL_GCS |
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1256 } |
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1257 |
| 0 | 1258 void GenCollectedHeap::print_tracing_info() const { |
| 1259 if (TraceGen0Time) { | |
| 1260 get_gen(0)->print_summary_info(); | |
| 1261 } | |
| 1262 if (TraceGen1Time) { | |
| 1263 get_gen(1)->print_summary_info(); | |
| 1264 } | |
| 1265 } | |
| 1266 | |
| 1267 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
| 1268 if (PrintGCDetails && Verbose) { | |
| 1269 gclog_or_tty->print(" " SIZE_FORMAT | |
| 1270 "->" SIZE_FORMAT | |
| 1271 "(" SIZE_FORMAT ")", | |
| 1272 prev_used, used(), capacity()); | |
| 1273 } else { | |
| 1274 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 1275 "->" SIZE_FORMAT "K" | |
| 1276 "(" SIZE_FORMAT "K)", | |
| 1277 prev_used / K, used() / K, capacity() / K); | |
| 1278 } | |
| 1279 } | |
| 1280 | |
| 1281 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
| 1282 private: | |
| 1283 bool _full; | |
| 1284 public: | |
| 1285 void do_generation(Generation* gen) { | |
| 1286 gen->gc_prologue(_full); | |
| 1287 } | |
| 1288 GenGCPrologueClosure(bool full) : _full(full) {}; | |
| 1289 }; | |
| 1290 | |
| 1291 void GenCollectedHeap::gc_prologue(bool full) { | |
| 1292 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 1293 | |
| 1294 always_do_update_barrier = false; | |
| 1295 // Fill TLAB's and such | |
| 1296 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 1297 ensure_parsability(true); // retire TLABs | |
| 1298 | |
| 1299 // Walk generations | |
| 1300 GenGCPrologueClosure blk(full); | |
| 1301 generation_iterate(&blk, false); // not old-to-young. | |
| 1302 }; | |
| 1303 | |
| 1304 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
| 1305 private: | |
| 1306 bool _full; | |
| 1307 public: | |
| 1308 void do_generation(Generation* gen) { | |
| 1309 gen->gc_epilogue(_full); | |
| 1310 } | |
| 1311 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
| 1312 }; | |
| 1313 | |
| 1314 void GenCollectedHeap::gc_epilogue(bool full) { | |
| 22298 | 1315 #if defined(COMPILER2) || INCLUDE_JVMCI |
| 0 | 1316 assert(DerivedPointerTable::is_empty(), "derived pointer present"); |
| 1317 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
| 1318 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
| 1319 #endif /* COMPILER2 */ | |
| 1320 | |
| 1321 resize_all_tlabs(); | |
| 1322 | |
| 1323 GenGCEpilogueClosure blk(full); | |
| 1324 generation_iterate(&blk, false); // not old-to-young. | |
| 1325 | |
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1326 if (!CleanChunkPoolAsync) { |
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1327 Chunk::clean_chunk_pool(); |
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1328 } |
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1329 |
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1330 MetaspaceCounters::update_performance_counters(); |
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1331 CompressedClassSpaceCounters::update_performance_counters(); |
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1332 |
| 0 | 1333 always_do_update_barrier = UseConcMarkSweepGC; |
| 1334 }; | |
| 1335 | |
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1336 #ifndef PRODUCT |
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1337 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1338 private: |
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1339 public: |
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1340 void do_generation(Generation* gen) { |
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1341 gen->record_spaces_top(); |
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1342 } |
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1343 }; |
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1344 |
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1345 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1346 if (ZapUnusedHeapArea) { |
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1347 GenGCSaveTopsBeforeGCClosure blk; |
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1348 generation_iterate(&blk, false); // not old-to-young. |
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1349 } |
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1350 } |
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1351 #endif // not PRODUCT |
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1352 |
| 0 | 1353 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
| 1354 public: | |
| 1355 void do_generation(Generation* gen) { | |
| 1356 gen->ensure_parsability(); | |
| 1357 } | |
| 1358 }; | |
| 1359 | |
| 1360 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
| 1361 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 1362 GenEnsureParsabilityClosure ep_cl; | |
| 1363 generation_iterate(&ep_cl, false); | |
| 1364 } | |
| 1365 | |
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1366 oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
| 0 | 1367 oop obj, |
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1368 size_t obj_size) { |
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1369 guarantee(old_gen->level() == 1, "We only get here with an old generation"); |
| 0 | 1370 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 1371 HeapWord* result = NULL; | |
| 1372 | |
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1373 result = old_gen->expand_and_allocate(obj_size, false); |
| 0 | 1374 |
| 1375 if (result != NULL) { | |
| 1376 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 1377 } | |
| 1378 return oop(result); | |
| 1379 } | |
| 1380 | |
| 1381 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
| 1382 jlong _time; // in ms | |
| 1383 jlong _now; // in ms | |
| 1384 | |
| 1385 public: | |
| 1386 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
| 1387 | |
| 1388 jlong time() { return _time; } | |
| 1389 | |
| 1390 void do_generation(Generation* gen) { | |
| 1391 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
| 1392 } | |
| 1393 }; | |
| 1394 | |
| 1395 jlong GenCollectedHeap::millis_since_last_gc() { | |
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1396 // We need a monotonically non-deccreasing time in ms but |
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1397 // os::javaTimeMillis() does not guarantee monotonicity. |
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1398 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 1399 GenTimeOfLastGCClosure tolgc_cl(now); |
| 1400 // iterate over generations getting the oldest | |
| 1401 // time that a generation was collected | |
| 1402 generation_iterate(&tolgc_cl, false); | |
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1403 |
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1404 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
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1405 // provided the underlying platform provides such a time source |
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1406 // (and it is bug free). So we still have to guard against getting |
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1407 // back a time later than 'now'. |
| 0 | 1408 jlong retVal = now - tolgc_cl.time(); |
| 1409 if (retVal < 0) { | |
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1410 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, (int64_t) retVal);) |
| 0 | 1411 return 0; |
| 1412 } | |
| 1413 return retVal; | |
| 1414 } |