Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 17866:270d7cb38f40
8038934: Remove prefix allocated_ from methods and variables in Metaspace
Reviewed-by: jmasa, coleenp
| author | ehelin |
|---|---|
| date | Mon, 31 Mar 2014 17:09:38 +0200 |
| parents | cfd4aac53239 |
| children | 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 10405 | 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
| 29 #include "code/icBuffer.hpp" | |
| 30 #include "gc_implementation/shared/collectorCounters.hpp" | |
| 10405 | 31 #include "gc_implementation/shared/gcTraceTime.hpp" |
| 1972 | 32 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 33 #include "gc_interface/collectedHeap.inline.hpp" | |
| 34 #include "memory/filemap.hpp" | |
| 35 #include "memory/gcLocker.inline.hpp" | |
| 36 #include "memory/genCollectedHeap.hpp" | |
| 37 #include "memory/genOopClosures.inline.hpp" | |
| 38 #include "memory/generation.inline.hpp" | |
| 39 #include "memory/generationSpec.hpp" | |
| 40 #include "memory/resourceArea.hpp" | |
| 41 #include "memory/sharedHeap.hpp" | |
| 42 #include "memory/space.hpp" | |
| 43 #include "oops/oop.inline.hpp" | |
| 44 #include "oops/oop.inline2.hpp" | |
| 45 #include "runtime/biasedLocking.hpp" | |
| 46 #include "runtime/fprofiler.hpp" | |
| 47 #include "runtime/handles.hpp" | |
| 48 #include "runtime/handles.inline.hpp" | |
| 49 #include "runtime/java.hpp" | |
| 50 #include "runtime/vmThread.hpp" | |
| 51 #include "services/memoryService.hpp" | |
| 52 #include "utilities/vmError.hpp" | |
| 53 #include "utilities/workgroup.hpp" | |
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54 #include "utilities/macros.hpp" |
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55 #if INCLUDE_ALL_GCS |
| 1972 | 56 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
| 57 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
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58 #endif // INCLUDE_ALL_GCS |
| 0 | 59 |
| 60 GenCollectedHeap* GenCollectedHeap::_gch; | |
| 61 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
| 62 | |
| 63 // The set of potentially parallel tasks in strong root scanning. | |
| 64 enum GCH_process_strong_roots_tasks { | |
| 65 // We probably want to parallelize both of these internally, but for now... | |
| 66 GCH_PS_younger_gens, | |
| 67 // Leave this one last. | |
| 68 GCH_PS_NumElements | |
| 69 }; | |
| 70 | |
| 71 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
| 72 SharedHeap(policy), | |
| 73 _gen_policy(policy), | |
| 74 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
| 75 _full_collections_completed(0) | |
| 76 { | |
| 77 if (_gen_process_strong_tasks == NULL || | |
| 78 !_gen_process_strong_tasks->valid()) { | |
| 79 vm_exit_during_initialization("Failed necessary allocation."); | |
| 80 } | |
| 81 assert(policy != NULL, "Sanity check"); | |
| 82 } | |
| 83 | |
| 84 jint GenCollectedHeap::initialize() { | |
| 1166 | 85 CollectedHeap::pre_initialize(); |
| 86 | |
| 0 | 87 int i; |
| 88 _n_gens = gen_policy()->number_of_generations(); | |
| 89 | |
| 90 // While there are no constraints in the GC code that HeapWordSize | |
| 91 // be any particular value, there are multiple other areas in the | |
| 92 // system which believe this to be true (e.g. oop->object_size in some | |
| 93 // cases incorrectly returns the size in wordSize units rather than | |
| 94 // HeapWordSize). | |
| 95 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 96 | |
| 97 // The heap must be at least as aligned as generations. | |
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98 size_t gen_alignment = Generation::GenGrain; |
| 0 | 99 |
| 100 _gen_specs = gen_policy()->generations(); | |
| 101 | |
| 102 // Make sure the sizes are all aligned. | |
| 103 for (i = 0; i < _n_gens; i++) { | |
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104 _gen_specs[i]->align(gen_alignment); |
| 0 | 105 } |
| 106 | |
| 107 // Allocate space for the heap. | |
| 108 | |
| 109 char* heap_address; | |
| 110 size_t total_reserved = 0; | |
| 111 int n_covered_regions = 0; | |
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112 ReservedSpace heap_rs; |
| 0 | 113 |
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114 size_t heap_alignment = collector_policy()->heap_alignment(); |
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115 |
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116 heap_address = allocate(heap_alignment, &total_reserved, |
| 0 | 117 &n_covered_regions, &heap_rs); |
| 118 | |
| 119 if (!heap_rs.is_reserved()) { | |
| 120 vm_shutdown_during_initialization( | |
| 121 "Could not reserve enough space for object heap"); | |
| 122 return JNI_ENOMEM; | |
| 123 } | |
| 124 | |
| 125 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 126 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 127 | |
| 128 // It is important to do this in a way such that concurrent readers can't | |
| 129 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
| 130 _reserved.set_word_size(0); | |
| 131 _reserved.set_start((HeapWord*)heap_rs.base()); | |
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132 size_t actual_heap_size = heap_rs.size(); |
| 0 | 133 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
| 134 | |
| 135 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
| 136 set_barrier_set(rem_set()->bs()); | |
| 1166 | 137 |
| 0 | 138 _gch = this; |
| 139 | |
| 140 for (i = 0; i < _n_gens; i++) { | |
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141 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
| 0 | 142 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
| 143 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
| 144 } | |
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145 clear_incremental_collection_failed(); |
| 0 | 146 |
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147 #if INCLUDE_ALL_GCS |
| 0 | 148 // If we are running CMS, create the collector responsible |
| 149 // for collecting the CMS generations. | |
| 150 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
| 151 bool success = create_cms_collector(); | |
| 152 if (!success) return JNI_ENOMEM; | |
| 153 } | |
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154 #endif // INCLUDE_ALL_GCS |
| 0 | 155 |
| 156 return JNI_OK; | |
| 157 } | |
| 158 | |
| 159 | |
| 160 char* GenCollectedHeap::allocate(size_t alignment, | |
| 161 size_t* _total_reserved, | |
| 162 int* _n_covered_regions, | |
| 163 ReservedSpace* heap_rs){ | |
| 164 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
| 165 "the maximum representable size"; | |
| 166 | |
| 167 // Now figure out the total size. | |
| 168 size_t total_reserved = 0; | |
| 169 int n_covered_regions = 0; | |
| 170 const size_t pageSize = UseLargePages ? | |
| 171 os::large_page_size() : os::vm_page_size(); | |
| 172 | |
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173 assert(alignment % pageSize == 0, "Must be"); |
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174 |
| 0 | 175 for (int i = 0; i < _n_gens; i++) { |
| 176 total_reserved += _gen_specs[i]->max_size(); | |
| 177 if (total_reserved < _gen_specs[i]->max_size()) { | |
| 178 vm_exit_during_initialization(overflow_msg); | |
| 179 } | |
| 180 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
| 181 } | |
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182 assert(total_reserved % alignment == 0, |
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183 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", alignment=" |
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184 SIZE_FORMAT, total_reserved, alignment)); |
| 0 | 185 |
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186 // Needed until the cardtable is fixed to have the right number |
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187 // of covered regions. |
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188 n_covered_regions += 2; |
| 0 | 189 |
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190 *_total_reserved = total_reserved; |
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191 *_n_covered_regions = n_covered_regions; |
| 0 | 192 |
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193 *heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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194 return heap_rs->base(); |
| 0 | 195 } |
| 196 | |
| 197 | |
| 198 void GenCollectedHeap::post_initialize() { | |
| 199 SharedHeap::post_initialize(); | |
| 200 TwoGenerationCollectorPolicy *policy = | |
| 201 (TwoGenerationCollectorPolicy *)collector_policy(); | |
| 202 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
| 203 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
| 204 assert(def_new_gen->kind() == Generation::DefNew || | |
| 205 def_new_gen->kind() == Generation::ParNew || | |
| 206 def_new_gen->kind() == Generation::ASParNew, | |
| 207 "Wrong generation kind"); | |
| 208 | |
| 209 Generation* old_gen = get_gen(1); | |
| 210 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
| 211 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
| 212 old_gen->kind() == Generation::MarkSweepCompact, | |
| 213 "Wrong generation kind"); | |
| 214 | |
| 215 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
| 216 old_gen->capacity(), | |
| 217 def_new_gen->from()->capacity()); | |
| 218 policy->initialize_gc_policy_counters(); | |
| 219 } | |
| 220 | |
| 221 void GenCollectedHeap::ref_processing_init() { | |
| 222 SharedHeap::ref_processing_init(); | |
| 223 for (int i = 0; i < _n_gens; i++) { | |
| 224 _gens[i]->ref_processor_init(); | |
| 225 } | |
| 226 } | |
| 227 | |
| 228 size_t GenCollectedHeap::capacity() const { | |
| 229 size_t res = 0; | |
| 230 for (int i = 0; i < _n_gens; i++) { | |
| 231 res += _gens[i]->capacity(); | |
| 232 } | |
| 233 return res; | |
| 234 } | |
| 235 | |
| 236 size_t GenCollectedHeap::used() const { | |
| 237 size_t res = 0; | |
| 238 for (int i = 0; i < _n_gens; i++) { | |
| 239 res += _gens[i]->used(); | |
| 240 } | |
| 241 return res; | |
| 242 } | |
| 243 | |
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244 // Save the "used_region" for generations level and lower. |
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245 void GenCollectedHeap::save_used_regions(int level) { |
| 0 | 246 assert(level < _n_gens, "Illegal level parameter"); |
| 247 for (int i = level; i >= 0; i--) { | |
| 248 _gens[i]->save_used_region(); | |
| 249 } | |
| 250 } | |
| 251 | |
| 252 size_t GenCollectedHeap::max_capacity() const { | |
| 253 size_t res = 0; | |
| 254 for (int i = 0; i < _n_gens; i++) { | |
| 255 res += _gens[i]->max_capacity(); | |
| 256 } | |
| 257 return res; | |
| 258 } | |
| 259 | |
| 260 // Update the _full_collections_completed counter | |
| 261 // at the end of a stop-world full GC. | |
| 262 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
| 263 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 264 assert(_full_collections_completed <= _total_full_collections, | |
| 265 "Can't complete more collections than were started"); | |
| 266 _full_collections_completed = _total_full_collections; | |
| 267 ml.notify_all(); | |
| 268 return _full_collections_completed; | |
| 269 } | |
| 270 | |
| 271 // Update the _full_collections_completed counter, as appropriate, | |
| 272 // at the end of a concurrent GC cycle. Note the conditional update | |
| 273 // below to allow this method to be called by a concurrent collector | |
| 274 // without synchronizing in any manner with the VM thread (which | |
| 275 // may already have initiated a STW full collection "concurrently"). | |
| 276 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
| 277 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 278 assert((_full_collections_completed <= _total_full_collections) && | |
| 279 (count <= _total_full_collections), | |
| 280 "Can't complete more collections than were started"); | |
| 281 if (count > _full_collections_completed) { | |
| 282 _full_collections_completed = count; | |
| 283 ml.notify_all(); | |
| 284 } | |
| 285 return _full_collections_completed; | |
| 286 } | |
| 287 | |
| 288 | |
| 289 #ifndef PRODUCT | |
| 290 // Override of memory state checking method in CollectedHeap: | |
| 291 // Some collectors (CMS for example) can't have badHeapWordVal written | |
| 292 // in the first two words of an object. (For instance , in the case of | |
| 293 // CMS these words hold state used to synchronize between certain | |
| 294 // (concurrent) GC steps and direct allocating mutators.) | |
| 295 // The skip_header_HeapWords() method below, allows us to skip | |
| 296 // over the requisite number of HeapWord's. Note that (for | |
| 297 // generational collectors) this means that those many words are | |
| 298 // skipped in each object, irrespective of the generation in which | |
| 299 // that object lives. The resultant loss of precision seems to be | |
| 300 // harmless and the pain of avoiding that imprecision appears somewhat | |
| 301 // higher than we are prepared to pay for such rudimentary debugging | |
| 302 // support. | |
| 303 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
| 304 size_t size) { | |
| 305 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
| 306 // We are asked to check a size in HeapWords, | |
| 307 // but the memory is mangled in juint words. | |
| 308 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
| 309 juint* end = (juint*) (addr + size); | |
| 310 for (juint* slot = start; slot < end; slot += 1) { | |
| 311 assert(*slot == badHeapWordVal, | |
| 312 "Found non badHeapWordValue in pre-allocation check"); | |
| 313 } | |
| 314 } | |
| 315 } | |
| 316 #endif | |
| 317 | |
| 318 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
| 319 bool is_tlab, | |
| 320 bool first_only) { | |
| 321 HeapWord* res; | |
| 322 for (int i = 0; i < _n_gens; i++) { | |
| 323 if (_gens[i]->should_allocate(size, is_tlab)) { | |
| 324 res = _gens[i]->allocate(size, is_tlab); | |
| 325 if (res != NULL) return res; | |
| 326 else if (first_only) break; | |
| 327 } | |
| 328 } | |
| 329 // Otherwise... | |
| 330 return NULL; | |
| 331 } | |
| 332 | |
| 333 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
| 334 bool* gc_overhead_limit_was_exceeded) { | |
| 335 return collector_policy()->mem_allocate_work(size, | |
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336 false /* is_tlab */, |
| 0 | 337 gc_overhead_limit_was_exceeded); |
| 338 } | |
| 339 | |
| 340 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
| 341 return _gc_cause == GCCause::_last_ditch_collection; | |
| 342 } | |
| 343 | |
| 344 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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345 return UseConcMarkSweepGC && |
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346 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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347 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
| 0 | 348 } |
| 349 | |
| 350 void GenCollectedHeap::do_collection(bool full, | |
| 351 bool clear_all_soft_refs, | |
| 352 size_t size, | |
| 353 bool is_tlab, | |
| 354 int max_level) { | |
| 355 bool prepared_for_verification = false; | |
| 356 ResourceMark rm; | |
| 357 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
| 358 | |
| 359 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 360 assert(my_thread->is_VM_thread() || | |
| 361 my_thread->is_ConcurrentGC_thread(), | |
| 362 "incorrect thread type capability"); | |
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363 assert(Heap_lock->is_locked(), |
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364 "the requesting thread should have the Heap_lock"); |
| 0 | 365 guarantee(!is_gc_active(), "collection is not reentrant"); |
| 366 assert(max_level < n_gens(), "sanity check"); | |
| 367 | |
| 368 if (GC_locker::check_active_before_gc()) { | |
| 369 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 370 } | |
| 371 | |
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372 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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373 collector_policy()->should_clear_all_soft_refs(); |
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374 |
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375 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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376 |
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377 const size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
| 0 | 378 |
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379 print_heap_before_gc(); |
| 0 | 380 |
| 381 { | |
| 382 FlagSetting fl(_is_gc_active, true); | |
| 383 | |
| 384 bool complete = full && (max_level == (n_gens()-1)); | |
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385 const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
| 0 | 386 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 387 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 10405 | 388 GCTraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, NULL); |
| 0 | 389 |
| 390 gc_prologue(complete); | |
| 391 increment_total_collections(complete); | |
| 392 | |
| 393 size_t gch_prev_used = used(); | |
| 394 | |
| 395 int starting_level = 0; | |
| 396 if (full) { | |
| 397 // Search for the oldest generation which will collect all younger | |
| 398 // generations, and start collection loop there. | |
| 399 for (int i = max_level; i >= 0; i--) { | |
| 400 if (_gens[i]->full_collects_younger_generations()) { | |
| 401 starting_level = i; | |
| 402 break; | |
| 403 } | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 bool must_restore_marks_for_biased_locking = false; | |
| 408 | |
| 409 int max_level_collected = starting_level; | |
| 410 for (int i = starting_level; i <= max_level; i++) { | |
| 411 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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412 if (i == n_gens() - 1) { // a major collection is to happen |
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413 if (!complete) { |
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414 // The full_collections increment was missed above. |
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415 increment_total_full_collections(); |
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416 } |
| 10405 | 417 pre_full_gc_dump(NULL); // do any pre full gc dumps |
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418 } |
| 0 | 419 // Timer for individual generations. Last argument is false: no CR |
| 10405 | 420 // FIXME: We should try to start the timing earlier to cover more of the GC pause |
| 421 GCTraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, NULL); | |
| 0 | 422 TraceCollectorStats tcs(_gens[i]->counters()); |
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423 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
| 0 | 424 |
| 425 size_t prev_used = _gens[i]->used(); | |
| 426 _gens[i]->stat_record()->invocations++; | |
| 427 _gens[i]->stat_record()->accumulated_time.start(); | |
| 428 | |
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429 // Must be done anew before each collection because |
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430 // a previous collection will do mangling and will |
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431 // change top of some spaces. |
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432 record_gen_tops_before_GC(); |
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433 |
| 0 | 434 if (PrintGC && Verbose) { |
| 435 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
| 436 i, | |
| 437 _gens[i]->stat_record()->invocations, | |
| 438 size*HeapWordSize); | |
| 439 } | |
| 440 | |
| 441 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
| 442 total_collections() >= VerifyGCStartAt) { | |
| 443 HandleMark hm; // Discard invalid handles created during verification | |
| 444 if (!prepared_for_verification) { | |
| 445 prepare_for_verify(); | |
| 446 prepared_for_verification = true; | |
| 447 } | |
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448 Universe::verify(" VerifyBeforeGC:"); |
| 0 | 449 } |
| 450 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 451 | |
| 452 if (!must_restore_marks_for_biased_locking && | |
| 453 _gens[i]->performs_in_place_marking()) { | |
| 454 // We perform this mark word preservation work lazily | |
| 455 // because it's only at this point that we know whether we | |
| 456 // absolutely have to do it; we want to avoid doing it for | |
| 457 // scavenge-only collections where it's unnecessary | |
| 458 must_restore_marks_for_biased_locking = true; | |
| 459 BiasedLocking::preserve_marks(); | |
| 460 } | |
| 461 | |
| 462 // Do collection work | |
| 463 { | |
| 464 // Note on ref discovery: For what appear to be historical reasons, | |
| 465 // GCH enables and disabled (by enqueing) refs discovery. | |
| 466 // In the future this should be moved into the generation's | |
| 467 // collect method so that ref discovery and enqueueing concerns | |
| 468 // are local to a generation. The collect method could return | |
| 469 // an appropriate indication in the case that notification on | |
| 470 // the ref lock was needed. This will make the treatment of | |
| 471 // weak refs more uniform (and indeed remove such concerns | |
| 472 // from GCH). XXX | |
| 473 | |
| 474 HandleMark hm; // Discard invalid handles created during gc | |
| 475 save_marks(); // save marks for all gens | |
| 476 // We want to discover references, but not process them yet. | |
| 477 // This mode is disabled in process_discovered_references if the | |
| 478 // generation does some collection work, or in | |
| 479 // enqueue_discovered_references if the generation returns | |
| 480 // without doing any work. | |
| 481 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
| 482 // If the discovery of ("weak") refs in this generation is | |
| 483 // atomic wrt other collectors in this configuration, we | |
| 484 // are guaranteed to have empty discovered ref lists. | |
| 485 if (rp->discovery_is_atomic()) { | |
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486 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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487 rp->setup_policy(do_clear_all_soft_refs); |
| 0 | 488 } else { |
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489 // collect() below will enable discovery as appropriate |
| 0 | 490 } |
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491 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
| 0 | 492 if (!rp->enqueuing_is_done()) { |
| 493 rp->enqueue_discovered_references(); | |
| 494 } else { | |
| 495 rp->set_enqueuing_is_done(false); | |
| 496 } | |
| 497 rp->verify_no_references_recorded(); | |
| 498 } | |
| 499 max_level_collected = i; | |
| 500 | |
| 501 // Determine if allocation request was met. | |
| 502 if (size > 0) { | |
| 503 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
| 504 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
| 505 size = 0; | |
| 506 } | |
| 507 } | |
| 508 } | |
| 509 | |
| 510 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 511 | |
| 512 _gens[i]->stat_record()->accumulated_time.stop(); | |
| 513 | |
| 514 update_gc_stats(i, full); | |
| 515 | |
| 516 if (VerifyAfterGC && i >= VerifyGCLevel && | |
| 517 total_collections() >= VerifyGCStartAt) { | |
| 518 HandleMark hm; // Discard invalid handles created during verification | |
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519 Universe::verify(" VerifyAfterGC:"); |
| 0 | 520 } |
| 521 | |
| 522 if (PrintGCDetails) { | |
| 523 gclog_or_tty->print(":"); | |
| 524 _gens[i]->print_heap_change(prev_used); | |
| 525 } | |
| 526 } | |
| 527 } | |
| 528 | |
| 529 // Update "complete" boolean wrt what actually transpired -- | |
| 530 // for instance, a promotion failure could have led to | |
| 531 // a whole heap collection. | |
| 532 complete = complete || (max_level_collected == n_gens() - 1); | |
| 533 | |
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534 if (complete) { // We did a "major" collection |
| 10405 | 535 // FIXME: See comment at pre_full_gc_dump call |
| 536 post_full_gc_dump(NULL); // do any post full gc dumps | |
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537 } |
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538 |
| 0 | 539 if (PrintGCDetails) { |
| 540 print_heap_change(gch_prev_used); | |
| 541 | |
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542 // Print metaspace info for full GC with PrintGCDetails flag. |
| 0 | 543 if (complete) { |
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544 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
| 0 | 545 } |
| 546 } | |
| 547 | |
| 548 for (int j = max_level_collected; j >= 0; j -= 1) { | |
| 549 // Adjust generation sizes. | |
| 550 _gens[j]->compute_new_size(); | |
| 551 } | |
| 552 | |
| 553 if (complete) { | |
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554 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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555 ClassLoaderDataGraph::purge(); |
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556 MetaspaceAux::verify_metrics(); |
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557 // Resize the metaspace capacity after full collections |
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558 MetaspaceGC::compute_new_size(); |
| 0 | 559 update_full_collections_completed(); |
| 560 } | |
| 561 | |
| 562 // Track memory usage and detect low memory after GC finishes | |
| 563 MemoryService::track_memory_usage(); | |
| 564 | |
| 565 gc_epilogue(complete); | |
| 566 | |
| 567 if (must_restore_marks_for_biased_locking) { | |
| 568 BiasedLocking::restore_marks(); | |
| 569 } | |
| 570 } | |
| 571 | |
| 572 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
| 573 AdaptiveSizePolicyOutput(sp, total_collections()); | |
| 574 | |
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575 print_heap_after_gc(); |
| 0 | 576 |
|
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577 #ifdef TRACESPINNING |
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578 ParallelTaskTerminator::print_termination_counts(); |
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579 #endif |
| 0 | 580 } |
| 581 | |
| 582 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
| 583 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
| 584 } | |
| 585 | |
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586 void GenCollectedHeap::set_par_threads(uint t) { |
| 0 | 587 SharedHeap::set_par_threads(t); |
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588 _gen_process_strong_tasks->set_n_threads(t); |
| 0 | 589 } |
| 590 | |
| 591 void GenCollectedHeap:: | |
| 592 gen_process_strong_roots(int level, | |
| 593 bool younger_gens_as_roots, | |
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594 bool activate_scope, |
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595 bool is_scavenging, |
| 0 | 596 SharedHeap::ScanningOption so, |
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597 OopsInGenClosure* not_older_gens, |
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598 bool do_code_roots, |
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599 OopsInGenClosure* older_gens, |
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600 KlassClosure* klass_closure) { |
| 0 | 601 // General strong roots. |
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602 |
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603 if (!do_code_roots) { |
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604 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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605 not_older_gens, NULL, klass_closure); |
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606 } else { |
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607 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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608 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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609 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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610 not_older_gens, &code_roots, klass_closure); |
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611 } |
| 0 | 612 |
| 613 if (younger_gens_as_roots) { | |
| 614 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
| 615 for (int i = 0; i < level; i++) { | |
| 616 not_older_gens->set_generation(_gens[i]); | |
| 617 _gens[i]->oop_iterate(not_older_gens); | |
| 618 } | |
| 619 not_older_gens->reset_generation(); | |
| 620 } | |
| 621 } | |
| 622 // When collection is parallel, all threads get to cooperate to do | |
| 623 // older-gen scanning. | |
| 624 for (int i = level+1; i < _n_gens; i++) { | |
| 625 older_gens->set_generation(_gens[i]); | |
| 626 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
| 627 older_gens->reset_generation(); | |
| 628 } | |
| 629 | |
| 630 _gen_process_strong_tasks->all_tasks_completed(); | |
| 631 } | |
| 632 | |
| 633 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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634 CodeBlobClosure* code_roots) { |
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635 SharedHeap::process_weak_roots(root_closure, code_roots); |
| 0 | 636 // "Local" "weak" refs |
| 637 for (int i = 0; i < _n_gens; i++) { | |
| 638 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
| 639 } | |
| 640 } | |
| 641 | |
| 642 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 643 void GenCollectedHeap:: \ | |
| 644 oop_since_save_marks_iterate(int level, \ | |
| 645 OopClosureType* cur, \ | |
| 646 OopClosureType* older) { \ | |
| 647 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
| 648 for (int i = level+1; i < n_gens(); i++) { \ | |
| 649 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 650 } \ | |
| 651 } | |
| 652 | |
| 653 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 654 | |
| 655 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 656 | |
| 657 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
| 658 for (int i = level; i < _n_gens; i++) { | |
| 659 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
| 660 } | |
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661 return true; |
| 0 | 662 } |
| 663 | |
| 664 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
| 665 return _gens[0]->supports_inline_contig_alloc(); | |
| 666 } | |
| 667 | |
| 668 HeapWord** GenCollectedHeap::top_addr() const { | |
| 669 return _gens[0]->top_addr(); | |
| 670 } | |
| 671 | |
| 672 HeapWord** GenCollectedHeap::end_addr() const { | |
| 673 return _gens[0]->end_addr(); | |
| 674 } | |
| 675 | |
| 676 size_t GenCollectedHeap::unsafe_max_alloc() { | |
| 677 return _gens[0]->unsafe_max_alloc_nogc(); | |
| 678 } | |
| 679 | |
| 680 // public collection interfaces | |
| 681 | |
| 682 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
| 683 if (should_do_concurrent_full_gc(cause)) { | |
|
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684 #if INCLUDE_ALL_GCS |
| 0 | 685 // mostly concurrent full collection |
| 686 collect_mostly_concurrent(cause); | |
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687 #else // INCLUDE_ALL_GCS |
| 0 | 688 ShouldNotReachHere(); |
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689 #endif // INCLUDE_ALL_GCS |
| 0 | 690 } else { |
| 691 #ifdef ASSERT | |
| 692 if (cause == GCCause::_scavenge_alot) { | |
| 693 // minor collection only | |
| 694 collect(cause, 0); | |
| 695 } else { | |
| 696 // Stop-the-world full collection | |
| 697 collect(cause, n_gens() - 1); | |
| 698 } | |
| 699 #else | |
| 700 // Stop-the-world full collection | |
| 701 collect(cause, n_gens() - 1); | |
| 702 #endif | |
| 703 } | |
| 704 } | |
| 705 | |
| 706 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
| 707 // The caller doesn't have the Heap_lock | |
| 708 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 709 MutexLocker ml(Heap_lock); | |
| 710 collect_locked(cause, max_level); | |
| 711 } | |
| 712 | |
| 713 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 714 // The caller has the Heap_lock | |
| 715 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
| 716 collect_locked(cause, n_gens() - 1); | |
| 717 } | |
| 718 | |
| 719 // this is the private collection interface | |
| 720 // The Heap_lock is expected to be held on entry. | |
| 721 | |
| 722 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
| 723 // Read the GC count while holding the Heap_lock | |
| 724 unsigned int gc_count_before = total_collections(); | |
| 725 unsigned int full_gc_count_before = total_full_collections(); | |
| 726 { | |
| 727 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 728 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
| 729 cause, max_level); | |
| 730 VMThread::execute(&op); | |
| 731 } | |
| 732 } | |
| 733 | |
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734 #if INCLUDE_ALL_GCS |
| 0 | 735 bool GenCollectedHeap::create_cms_collector() { |
| 736 | |
| 737 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
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738 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)), |
| 0 | 739 "Unexpected generation kinds"); |
| 740 // Skip two header words in the block content verification | |
| 741 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
| 742 CMSCollector* collector = new CMSCollector( | |
| 743 (ConcurrentMarkSweepGeneration*)_gens[1], | |
| 744 _rem_set->as_CardTableRS(), | |
| 745 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
| 746 | |
| 747 if (collector == NULL || !collector->completed_initialization()) { | |
| 748 if (collector) { | |
| 749 delete collector; // Be nice in embedded situation | |
| 750 } | |
| 751 vm_shutdown_during_initialization("Could not create CMS collector"); | |
| 752 return false; | |
| 753 } | |
| 754 return true; // success | |
| 755 } | |
| 756 | |
| 757 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
| 758 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
| 759 | |
| 760 MutexLocker ml(Heap_lock); | |
| 761 // Read the GC counts while holding the Heap_lock | |
| 762 unsigned int full_gc_count_before = total_full_collections(); | |
| 763 unsigned int gc_count_before = total_collections(); | |
| 764 { | |
| 765 MutexUnlocker mu(Heap_lock); | |
| 766 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
| 767 VMThread::execute(&op); | |
| 768 } | |
| 769 } | |
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770 #endif // INCLUDE_ALL_GCS |
| 0 | 771 |
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772 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
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773 do_full_collection(clear_all_soft_refs, _n_gens - 1); |
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774 } |
| 0 | 775 |
| 776 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
| 777 int max_level) { | |
| 778 int local_max_level; | |
|
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779 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
| 0 | 780 gc_cause() == GCCause::_gc_locker) { |
| 781 local_max_level = 0; | |
| 782 } else { | |
| 783 local_max_level = max_level; | |
| 784 } | |
| 785 | |
| 786 do_collection(true /* full */, | |
| 787 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 788 0 /* size */, | |
| 789 false /* is_tlab */, | |
| 790 local_max_level /* max_level */); | |
| 791 // Hack XXX FIX ME !!! | |
| 792 // A scavenge may not have been attempted, or may have | |
| 793 // been attempted and failed, because the old gen was too full | |
| 794 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
|
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795 incremental_collection_will_fail(false /* don't consult_young */)) { |
| 0 | 796 if (PrintGCDetails) { |
| 797 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
| 798 "because scavenge failed"); | |
| 799 } | |
| 800 // This time allow the old gen to be collected as well | |
| 801 do_collection(true /* full */, | |
| 802 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 803 0 /* size */, | |
| 804 false /* is_tlab */, | |
| 805 n_gens() - 1 /* max_level */); | |
| 806 } | |
| 807 } | |
| 808 | |
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809 bool GenCollectedHeap::is_in_young(oop p) { |
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810 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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811 assert(result == _gens[0]->is_in_reserved(p), |
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812 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, (void*)p)); |
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813 return result; |
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814 } |
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815 |
| 4708 | 816 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 0 | 817 bool GenCollectedHeap::is_in(const void* p) const { |
| 818 #ifndef ASSERT | |
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819 guarantee(VerifyBeforeGC || |
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820 VerifyDuringGC || |
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821 VerifyBeforeExit || |
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822 VerifyDuringStartup || |
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823 PrintAssembly || |
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824 tty->count() != 0 || // already printing |
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825 VerifyAfterGC || |
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826 VMError::fatal_error_in_progress(), "too expensive"); |
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827 |
| 0 | 828 #endif |
| 829 // This might be sped up with a cache of the last generation that | |
| 830 // answered yes. | |
| 831 for (int i = 0; i < _n_gens; i++) { | |
| 832 if (_gens[i]->is_in(p)) return true; | |
| 833 } | |
| 834 // Otherwise... | |
| 835 return false; | |
| 836 } | |
| 837 | |
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838 #ifdef ASSERT |
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839 // Don't implement this by using is_in_young(). This method is used |
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840 // in some cases to check that is_in_young() is correct. |
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841 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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842 assert(is_in_reserved(p) || p == NULL, |
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843 "Does not work if address is non-null and outside of the heap"); |
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844 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
| 0 | 845 } |
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846 #endif |
| 0 | 847 |
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848 void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 849 for (int i = 0; i < _n_gens; i++) { |
| 850 _gens[i]->oop_iterate(cl); | |
| 851 } | |
| 852 } | |
| 853 | |
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854 void GenCollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
| 0 | 855 for (int i = 0; i < _n_gens; i++) { |
| 856 _gens[i]->oop_iterate(mr, cl); | |
| 857 } | |
| 858 } | |
| 859 | |
| 860 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 861 for (int i = 0; i < _n_gens; i++) { | |
| 862 _gens[i]->object_iterate(cl); | |
| 863 } | |
| 864 } | |
| 865 | |
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866 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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867 for (int i = 0; i < _n_gens; i++) { |
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868 _gens[i]->safe_object_iterate(cl); |
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869 } |
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870 } |
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871 |
| 0 | 872 Space* GenCollectedHeap::space_containing(const void* addr) const { |
| 873 for (int i = 0; i < _n_gens; i++) { | |
| 874 Space* res = _gens[i]->space_containing(addr); | |
| 875 if (res != NULL) return res; | |
| 876 } | |
| 877 // Otherwise... | |
| 878 assert(false, "Could not find containing space"); | |
| 879 return NULL; | |
| 880 } | |
| 881 | |
| 882 | |
| 883 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
| 884 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
| 885 for (int i = 0; i < _n_gens; i++) { | |
| 886 if (_gens[i]->is_in_reserved(addr)) { | |
| 887 assert(_gens[i]->is_in(addr), | |
| 888 "addr should be in allocated part of generation"); | |
| 889 return _gens[i]->block_start(addr); | |
| 890 } | |
| 891 } | |
| 892 assert(false, "Some generation should contain the address"); | |
| 893 return NULL; | |
| 894 } | |
| 895 | |
| 896 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
| 897 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
| 898 for (int i = 0; i < _n_gens; i++) { | |
| 899 if (_gens[i]->is_in_reserved(addr)) { | |
| 900 assert(_gens[i]->is_in(addr), | |
| 901 "addr should be in allocated part of generation"); | |
| 902 return _gens[i]->block_size(addr); | |
| 903 } | |
| 904 } | |
| 905 assert(false, "Some generation should contain the address"); | |
| 906 return 0; | |
| 907 } | |
| 908 | |
| 909 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 910 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
| 911 assert(block_start(addr) == addr, "addr must be a block start"); | |
| 912 for (int i = 0; i < _n_gens; i++) { | |
| 913 if (_gens[i]->is_in_reserved(addr)) { | |
| 914 return _gens[i]->block_is_obj(addr); | |
| 915 } | |
| 916 } | |
| 917 assert(false, "Some generation should contain the address"); | |
| 918 return false; | |
| 919 } | |
| 920 | |
| 921 bool GenCollectedHeap::supports_tlab_allocation() const { | |
| 922 for (int i = 0; i < _n_gens; i += 1) { | |
| 923 if (_gens[i]->supports_tlab_allocation()) { | |
| 924 return true; | |
| 925 } | |
| 926 } | |
| 927 return false; | |
| 928 } | |
| 929 | |
| 930 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
| 931 size_t result = 0; | |
| 932 for (int i = 0; i < _n_gens; i += 1) { | |
| 933 if (_gens[i]->supports_tlab_allocation()) { | |
| 934 result += _gens[i]->tlab_capacity(); | |
| 935 } | |
| 936 } | |
| 937 return result; | |
| 938 } | |
| 939 | |
| 17727 | 940 size_t GenCollectedHeap::tlab_used(Thread* thr) const { |
| 941 size_t result = 0; | |
| 942 for (int i = 0; i < _n_gens; i += 1) { | |
| 943 if (_gens[i]->supports_tlab_allocation()) { | |
| 944 result += _gens[i]->tlab_used(); | |
| 945 } | |
| 946 } | |
| 947 return result; | |
| 948 } | |
| 949 | |
| 0 | 950 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
| 951 size_t result = 0; | |
| 952 for (int i = 0; i < _n_gens; i += 1) { | |
| 953 if (_gens[i]->supports_tlab_allocation()) { | |
| 954 result += _gens[i]->unsafe_max_tlab_alloc(); | |
| 955 } | |
| 956 } | |
| 957 return result; | |
| 958 } | |
| 959 | |
| 960 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
| 961 bool gc_overhead_limit_was_exceeded; | |
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962 return collector_policy()->mem_allocate_work(size /* size */, |
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963 true /* is_tlab */, |
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964 &gc_overhead_limit_was_exceeded); |
| 0 | 965 } |
| 966 | |
| 967 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
| 968 // from the list headed by "*prev_ptr". | |
| 969 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
| 970 bool first = true; | |
| 971 size_t min_size = 0; // "first" makes this conceptually infinite. | |
| 972 ScratchBlock **smallest_ptr, *smallest; | |
| 973 ScratchBlock *cur = *prev_ptr; | |
| 974 while (cur) { | |
| 975 assert(*prev_ptr == cur, "just checking"); | |
| 976 if (first || cur->num_words < min_size) { | |
| 977 smallest_ptr = prev_ptr; | |
| 978 smallest = cur; | |
| 979 min_size = smallest->num_words; | |
| 980 first = false; | |
| 981 } | |
| 982 prev_ptr = &cur->next; | |
| 983 cur = cur->next; | |
| 984 } | |
| 985 smallest = *smallest_ptr; | |
| 986 *smallest_ptr = smallest->next; | |
| 987 return smallest; | |
| 988 } | |
| 989 | |
| 990 // Sort the scratch block list headed by res into decreasing size order, | |
| 991 // and set "res" to the result. | |
| 992 static void sort_scratch_list(ScratchBlock*& list) { | |
| 993 ScratchBlock* sorted = NULL; | |
| 994 ScratchBlock* unsorted = list; | |
| 995 while (unsorted) { | |
| 996 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
| 997 smallest->next = sorted; | |
| 998 sorted = smallest; | |
| 999 } | |
| 1000 list = sorted; | |
| 1001 } | |
| 1002 | |
| 1003 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
| 1004 size_t max_alloc_words) { | |
| 1005 ScratchBlock* res = NULL; | |
| 1006 for (int i = 0; i < _n_gens; i++) { | |
| 1007 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
| 1008 } | |
| 1009 sort_scratch_list(res); | |
| 1010 return res; | |
| 1011 } | |
| 1012 | |
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1013 void GenCollectedHeap::release_scratch() { |
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1014 for (int i = 0; i < _n_gens; i++) { |
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1015 _gens[i]->reset_scratch(); |
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1016 } |
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1017 } |
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1018 |
| 0 | 1019 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
| 1020 void do_generation(Generation* gen) { | |
| 1021 gen->prepare_for_verify(); | |
| 1022 } | |
| 1023 }; | |
| 1024 | |
| 1025 void GenCollectedHeap::prepare_for_verify() { | |
| 1026 ensure_parsability(false); // no need to retire TLABs | |
| 1027 GenPrepareForVerifyClosure blk; | |
| 1028 generation_iterate(&blk, false); | |
| 1029 } | |
| 1030 | |
| 1031 | |
| 1032 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
| 1033 bool old_to_young) { | |
| 1034 if (old_to_young) { | |
| 1035 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1036 cl->do_generation(_gens[i]); | |
| 1037 } | |
| 1038 } else { | |
| 1039 for (int i = 0; i < _n_gens; i++) { | |
| 1040 cl->do_generation(_gens[i]); | |
| 1041 } | |
| 1042 } | |
| 1043 } | |
| 1044 | |
| 1045 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1046 for (int i = 0; i < _n_gens; i++) { | |
| 1047 _gens[i]->space_iterate(cl, true); | |
| 1048 } | |
| 1049 } | |
| 1050 | |
| 1051 bool GenCollectedHeap::is_maximal_no_gc() const { | |
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1052 for (int i = 0; i < _n_gens; i++) { |
| 0 | 1053 if (!_gens[i]->is_maximal_no_gc()) { |
| 1054 return false; | |
| 1055 } | |
| 1056 } | |
| 1057 return true; | |
| 1058 } | |
| 1059 | |
| 1060 void GenCollectedHeap::save_marks() { | |
| 1061 for (int i = 0; i < _n_gens; i++) { | |
| 1062 _gens[i]->save_marks(); | |
| 1063 } | |
| 1064 } | |
| 1065 | |
| 1066 GenCollectedHeap* GenCollectedHeap::heap() { | |
| 1067 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
| 1068 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
| 1069 return _gch; | |
| 1070 } | |
| 1071 | |
| 1072 | |
| 1073 void GenCollectedHeap::prepare_for_compaction() { | |
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1074 guarantee(_n_gens = 2, "Wrong number of generations"); |
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1075 Generation* old_gen = _gens[1]; |
| 0 | 1076 // Start by compacting into same gen. |
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1077 CompactPoint cp(old_gen, NULL, NULL); |
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1078 old_gen->prepare_for_compaction(&cp); |
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1079 Generation* young_gen = _gens[0]; |
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1080 young_gen->prepare_for_compaction(&cp); |
| 0 | 1081 } |
| 1082 | |
| 1083 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
| 1084 return _gens[level]->gc_stats(); | |
| 1085 } | |
| 1086 | |
| 6008 | 1087 void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 1088 for (int i = _n_gens-1; i >= 0; i--) { |
| 1089 Generation* g = _gens[i]; | |
| 1090 if (!silent) { | |
| 1091 gclog_or_tty->print(g->name()); | |
| 1092 gclog_or_tty->print(" "); | |
| 1093 } | |
| 6008 | 1094 g->verify(); |
| 0 | 1095 } |
| 1096 if (!silent) { | |
| 1097 gclog_or_tty->print("remset "); | |
| 1098 } | |
| 1099 rem_set()->verify(); | |
| 1100 } | |
| 1101 | |
| 1102 void GenCollectedHeap::print_on(outputStream* st) const { | |
| 1103 for (int i = 0; i < _n_gens; i++) { | |
| 1104 _gens[i]->print_on(st); | |
| 1105 } | |
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1106 MetaspaceAux::print_on(st); |
| 0 | 1107 } |
| 1108 | |
| 1109 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 1110 if (workers() != NULL) { | |
| 1111 workers()->threads_do(tc); | |
| 1112 } | |
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1113 #if INCLUDE_ALL_GCS |
| 0 | 1114 if (UseConcMarkSweepGC) { |
| 1115 ConcurrentMarkSweepThread::threads_do(tc); | |
| 1116 } | |
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1117 #endif // INCLUDE_ALL_GCS |
| 0 | 1118 } |
| 1119 | |
| 1120 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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1121 #if INCLUDE_ALL_GCS |
| 0 | 1122 if (UseParNewGC) { |
| 1123 workers()->print_worker_threads_on(st); | |
| 1124 } | |
| 1125 if (UseConcMarkSweepGC) { | |
| 1126 ConcurrentMarkSweepThread::print_all_on(st); | |
| 1127 } | |
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1128 #endif // INCLUDE_ALL_GCS |
| 0 | 1129 } |
| 1130 | |
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1131 void GenCollectedHeap::print_on_error(outputStream* st) const { |
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1132 this->CollectedHeap::print_on_error(st); |
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1133 |
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1134 #if INCLUDE_ALL_GCS |
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1135 if (UseConcMarkSweepGC) { |
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1136 st->cr(); |
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1137 CMSCollector::print_on_error(st); |
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1138 } |
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1139 #endif // INCLUDE_ALL_GCS |
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1140 } |
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1141 |
| 0 | 1142 void GenCollectedHeap::print_tracing_info() const { |
| 1143 if (TraceGen0Time) { | |
| 1144 get_gen(0)->print_summary_info(); | |
| 1145 } | |
| 1146 if (TraceGen1Time) { | |
| 1147 get_gen(1)->print_summary_info(); | |
| 1148 } | |
| 1149 } | |
| 1150 | |
| 1151 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
| 1152 if (PrintGCDetails && Verbose) { | |
| 1153 gclog_or_tty->print(" " SIZE_FORMAT | |
| 1154 "->" SIZE_FORMAT | |
| 1155 "(" SIZE_FORMAT ")", | |
| 1156 prev_used, used(), capacity()); | |
| 1157 } else { | |
| 1158 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 1159 "->" SIZE_FORMAT "K" | |
| 1160 "(" SIZE_FORMAT "K)", | |
| 1161 prev_used / K, used() / K, capacity() / K); | |
| 1162 } | |
| 1163 } | |
| 1164 | |
| 1165 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
| 1166 private: | |
| 1167 bool _full; | |
| 1168 public: | |
| 1169 void do_generation(Generation* gen) { | |
| 1170 gen->gc_prologue(_full); | |
| 1171 } | |
| 1172 GenGCPrologueClosure(bool full) : _full(full) {}; | |
| 1173 }; | |
| 1174 | |
| 1175 void GenCollectedHeap::gc_prologue(bool full) { | |
| 1176 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 1177 | |
| 1178 always_do_update_barrier = false; | |
| 1179 // Fill TLAB's and such | |
| 1180 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 1181 ensure_parsability(true); // retire TLABs | |
| 1182 | |
| 1183 // Walk generations | |
| 1184 GenGCPrologueClosure blk(full); | |
| 1185 generation_iterate(&blk, false); // not old-to-young. | |
| 1186 }; | |
| 1187 | |
| 1188 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
| 1189 private: | |
| 1190 bool _full; | |
| 1191 public: | |
| 1192 void do_generation(Generation* gen) { | |
| 1193 gen->gc_epilogue(_full); | |
| 1194 } | |
| 1195 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
| 1196 }; | |
| 1197 | |
| 1198 void GenCollectedHeap::gc_epilogue(bool full) { | |
| 1199 #ifdef COMPILER2 | |
| 1200 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
| 1201 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
| 1202 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
| 1203 #endif /* COMPILER2 */ | |
| 1204 | |
| 1205 resize_all_tlabs(); | |
| 1206 | |
| 1207 GenGCEpilogueClosure blk(full); | |
| 1208 generation_iterate(&blk, false); // not old-to-young. | |
| 1209 | |
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1210 if (!CleanChunkPoolAsync) { |
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1211 Chunk::clean_chunk_pool(); |
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1212 } |
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1213 |
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1214 MetaspaceCounters::update_performance_counters(); |
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1215 CompressedClassSpaceCounters::update_performance_counters(); |
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1216 |
| 0 | 1217 always_do_update_barrier = UseConcMarkSweepGC; |
| 1218 }; | |
| 1219 | |
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1220 #ifndef PRODUCT |
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1221 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1222 private: |
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1223 public: |
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1224 void do_generation(Generation* gen) { |
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1225 gen->record_spaces_top(); |
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1226 } |
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1227 }; |
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1228 |
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1229 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1230 if (ZapUnusedHeapArea) { |
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1231 GenGCSaveTopsBeforeGCClosure blk; |
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1232 generation_iterate(&blk, false); // not old-to-young. |
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1233 } |
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1234 } |
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1235 #endif // not PRODUCT |
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1236 |
| 0 | 1237 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
| 1238 public: | |
| 1239 void do_generation(Generation* gen) { | |
| 1240 gen->ensure_parsability(); | |
| 1241 } | |
| 1242 }; | |
| 1243 | |
| 1244 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
| 1245 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 1246 GenEnsureParsabilityClosure ep_cl; | |
| 1247 generation_iterate(&ep_cl, false); | |
| 1248 } | |
| 1249 | |
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1250 oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
| 0 | 1251 oop obj, |
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1252 size_t obj_size) { |
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1253 guarantee(old_gen->level() == 1, "We only get here with an old generation"); |
| 0 | 1254 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 1255 HeapWord* result = NULL; | |
| 1256 | |
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1257 result = old_gen->expand_and_allocate(obj_size, false); |
| 0 | 1258 |
| 1259 if (result != NULL) { | |
| 1260 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 1261 } | |
| 1262 return oop(result); | |
| 1263 } | |
| 1264 | |
| 1265 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
| 1266 jlong _time; // in ms | |
| 1267 jlong _now; // in ms | |
| 1268 | |
| 1269 public: | |
| 1270 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
| 1271 | |
| 1272 jlong time() { return _time; } | |
| 1273 | |
| 1274 void do_generation(Generation* gen) { | |
| 1275 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
| 1276 } | |
| 1277 }; | |
| 1278 | |
| 1279 jlong GenCollectedHeap::millis_since_last_gc() { | |
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1280 // We need a monotonically non-deccreasing time in ms but |
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1281 // os::javaTimeMillis() does not guarantee monotonicity. |
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1282 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 1283 GenTimeOfLastGCClosure tolgc_cl(now); |
| 1284 // iterate over generations getting the oldest | |
| 1285 // time that a generation was collected | |
| 1286 generation_iterate(&tolgc_cl, false); | |
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1287 |
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1288 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
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1289 // provided the underlying platform provides such a time source |
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1290 // (and it is bug free). So we still have to guard against getting |
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1291 // back a time later than 'now'. |
| 0 | 1292 jlong retVal = now - tolgc_cl.time(); |
| 1293 if (retVal < 0) { | |
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1294 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, retVal);) |
| 0 | 1295 return 0; |
| 1296 } | |
| 1297 return retVal; | |
| 1298 } |