Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 12063:1a8fb39bdbc4
8014659: NPG: performance counters for compressed klass space
Reviewed-by: mgerdin, coleenp, hseigel, jmasa, ctornqvi
| author | ehelin |
|---|---|
| date | Wed, 07 Aug 2013 16:47:32 +0200 |
| parents | 330dfb0476f4 |
| children | 4c84d351cca9 |
| 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1520
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1520
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1520
diff
changeset
|
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" | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
54 #include "utilities/macros.hpp" |
|
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
55 #if INCLUDE_ALL_GCS |
| 1972 | 56 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
| 57 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
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. | |
| 98 size_t alignment = Generation::GenGrain; | |
| 99 | |
| 100 _gen_specs = gen_policy()->generations(); | |
| 101 | |
| 102 // Make sure the sizes are all aligned. | |
| 103 for (i = 0; i < _n_gens; i++) { | |
| 104 _gen_specs[i]->align(alignment); | |
| 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; | |
| 112 ReservedSpace heap_rs(0); | |
| 113 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
114 heap_address = allocate(alignment, &total_reserved, |
| 0 | 115 &n_covered_regions, &heap_rs); |
| 116 | |
| 117 if (!heap_rs.is_reserved()) { | |
| 118 vm_shutdown_during_initialization( | |
| 119 "Could not reserve enough space for object heap"); | |
| 120 return JNI_ENOMEM; | |
| 121 } | |
| 122 | |
| 123 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 124 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 125 | |
| 126 // It is important to do this in a way such that concurrent readers can't | |
| 127 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
| 128 _reserved.set_word_size(0); | |
| 129 _reserved.set_start((HeapWord*)heap_rs.base()); | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
130 size_t actual_heap_size = heap_rs.size(); |
| 0 | 131 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
| 132 | |
| 133 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
| 134 set_barrier_set(rem_set()->bs()); | |
| 1166 | 135 |
| 0 | 136 _gch = this; |
| 137 | |
| 138 for (i = 0; i < _n_gens; i++) { | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
139 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
| 0 | 140 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
| 141 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
| 142 } | |
|
1888
a7214d79fcf1
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
1833
diff
changeset
|
143 clear_incremental_collection_failed(); |
| 0 | 144 |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
145 #if INCLUDE_ALL_GCS |
| 0 | 146 // If we are running CMS, create the collector responsible |
| 147 // for collecting the CMS generations. | |
| 148 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
| 149 bool success = create_cms_collector(); | |
| 150 if (!success) return JNI_ENOMEM; | |
| 151 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
152 #endif // INCLUDE_ALL_GCS |
| 0 | 153 |
| 154 return JNI_OK; | |
| 155 } | |
| 156 | |
| 157 | |
| 158 char* GenCollectedHeap::allocate(size_t alignment, | |
| 159 size_t* _total_reserved, | |
| 160 int* _n_covered_regions, | |
| 161 ReservedSpace* heap_rs){ | |
| 162 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
| 163 "the maximum representable size"; | |
| 164 | |
| 165 // Now figure out the total size. | |
| 166 size_t total_reserved = 0; | |
| 167 int n_covered_regions = 0; | |
| 168 const size_t pageSize = UseLargePages ? | |
| 169 os::large_page_size() : os::vm_page_size(); | |
| 170 | |
| 171 for (int i = 0; i < _n_gens; i++) { | |
| 172 total_reserved += _gen_specs[i]->max_size(); | |
| 173 if (total_reserved < _gen_specs[i]->max_size()) { | |
| 174 vm_exit_during_initialization(overflow_msg); | |
| 175 } | |
| 176 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
| 177 } | |
|
1626
1a11430e0326
6888573: class data sharing does not always disable large pages
jcoomes
parents:
1552
diff
changeset
|
178 assert(total_reserved % pageSize == 0, |
|
1a11430e0326
6888573: class data sharing does not always disable large pages
jcoomes
parents:
1552
diff
changeset
|
179 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", pageSize=" |
|
1a11430e0326
6888573: class data sharing does not always disable large pages
jcoomes
parents:
1552
diff
changeset
|
180 SIZE_FORMAT, total_reserved, pageSize)); |
| 0 | 181 |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
182 // Needed until the cardtable is fixed to have the right number |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
183 // of covered regions. |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
184 n_covered_regions += 2; |
| 0 | 185 |
| 186 if (UseLargePages) { | |
| 187 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
| 188 total_reserved = round_to(total_reserved, os::large_page_size()); | |
| 189 if (total_reserved < os::large_page_size()) { | |
| 190 vm_exit_during_initialization(overflow_msg); | |
| 191 } | |
| 192 } | |
| 193 | |
|
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
615
diff
changeset
|
194 *_total_reserved = total_reserved; |
|
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
615
diff
changeset
|
195 *_n_covered_regions = n_covered_regions; |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
196 *heap_rs = Universe::reserve_heap(total_reserved, alignment); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
197 return heap_rs->base(); |
| 0 | 198 } |
| 199 | |
| 200 | |
| 201 void GenCollectedHeap::post_initialize() { | |
| 202 SharedHeap::post_initialize(); | |
| 203 TwoGenerationCollectorPolicy *policy = | |
| 204 (TwoGenerationCollectorPolicy *)collector_policy(); | |
| 205 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
| 206 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
| 207 assert(def_new_gen->kind() == Generation::DefNew || | |
| 208 def_new_gen->kind() == Generation::ParNew || | |
| 209 def_new_gen->kind() == Generation::ASParNew, | |
| 210 "Wrong generation kind"); | |
| 211 | |
| 212 Generation* old_gen = get_gen(1); | |
| 213 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
| 214 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
| 215 old_gen->kind() == Generation::MarkSweepCompact, | |
| 216 "Wrong generation kind"); | |
| 217 | |
| 218 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
| 219 old_gen->capacity(), | |
| 220 def_new_gen->from()->capacity()); | |
| 221 policy->initialize_gc_policy_counters(); | |
| 222 } | |
| 223 | |
| 224 void GenCollectedHeap::ref_processing_init() { | |
| 225 SharedHeap::ref_processing_init(); | |
| 226 for (int i = 0; i < _n_gens; i++) { | |
| 227 _gens[i]->ref_processor_init(); | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 size_t GenCollectedHeap::capacity() const { | |
| 232 size_t res = 0; | |
| 233 for (int i = 0; i < _n_gens; i++) { | |
| 234 res += _gens[i]->capacity(); | |
| 235 } | |
| 236 return res; | |
| 237 } | |
| 238 | |
| 239 size_t GenCollectedHeap::used() const { | |
| 240 size_t res = 0; | |
| 241 for (int i = 0; i < _n_gens; i++) { | |
| 242 res += _gens[i]->used(); | |
| 243 } | |
| 244 return res; | |
| 245 } | |
| 246 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
247 // Save the "used_region" for generations level and lower. |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
248 void GenCollectedHeap::save_used_regions(int level) { |
| 0 | 249 assert(level < _n_gens, "Illegal level parameter"); |
| 250 for (int i = level; i >= 0; i--) { | |
| 251 _gens[i]->save_used_region(); | |
| 252 } | |
| 253 } | |
| 254 | |
| 255 size_t GenCollectedHeap::max_capacity() const { | |
| 256 size_t res = 0; | |
| 257 for (int i = 0; i < _n_gens; i++) { | |
| 258 res += _gens[i]->max_capacity(); | |
| 259 } | |
| 260 return res; | |
| 261 } | |
| 262 | |
| 263 // Update the _full_collections_completed counter | |
| 264 // at the end of a stop-world full GC. | |
| 265 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
| 266 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 267 assert(_full_collections_completed <= _total_full_collections, | |
| 268 "Can't complete more collections than were started"); | |
| 269 _full_collections_completed = _total_full_collections; | |
| 270 ml.notify_all(); | |
| 271 return _full_collections_completed; | |
| 272 } | |
| 273 | |
| 274 // Update the _full_collections_completed counter, as appropriate, | |
| 275 // at the end of a concurrent GC cycle. Note the conditional update | |
| 276 // below to allow this method to be called by a concurrent collector | |
| 277 // without synchronizing in any manner with the VM thread (which | |
| 278 // may already have initiated a STW full collection "concurrently"). | |
| 279 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
| 280 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 281 assert((_full_collections_completed <= _total_full_collections) && | |
| 282 (count <= _total_full_collections), | |
| 283 "Can't complete more collections than were started"); | |
| 284 if (count > _full_collections_completed) { | |
| 285 _full_collections_completed = count; | |
| 286 ml.notify_all(); | |
| 287 } | |
| 288 return _full_collections_completed; | |
| 289 } | |
| 290 | |
| 291 | |
| 292 #ifndef PRODUCT | |
| 293 // Override of memory state checking method in CollectedHeap: | |
| 294 // Some collectors (CMS for example) can't have badHeapWordVal written | |
| 295 // in the first two words of an object. (For instance , in the case of | |
| 296 // CMS these words hold state used to synchronize between certain | |
| 297 // (concurrent) GC steps and direct allocating mutators.) | |
| 298 // The skip_header_HeapWords() method below, allows us to skip | |
| 299 // over the requisite number of HeapWord's. Note that (for | |
| 300 // generational collectors) this means that those many words are | |
| 301 // skipped in each object, irrespective of the generation in which | |
| 302 // that object lives. The resultant loss of precision seems to be | |
| 303 // harmless and the pain of avoiding that imprecision appears somewhat | |
| 304 // higher than we are prepared to pay for such rudimentary debugging | |
| 305 // support. | |
| 306 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
| 307 size_t size) { | |
| 308 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
| 309 // We are asked to check a size in HeapWords, | |
| 310 // but the memory is mangled in juint words. | |
| 311 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
| 312 juint* end = (juint*) (addr + size); | |
| 313 for (juint* slot = start; slot < end; slot += 1) { | |
| 314 assert(*slot == badHeapWordVal, | |
| 315 "Found non badHeapWordValue in pre-allocation check"); | |
| 316 } | |
| 317 } | |
| 318 } | |
| 319 #endif | |
| 320 | |
| 321 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
| 322 bool is_tlab, | |
| 323 bool first_only) { | |
| 324 HeapWord* res; | |
| 325 for (int i = 0; i < _n_gens; i++) { | |
| 326 if (_gens[i]->should_allocate(size, is_tlab)) { | |
| 327 res = _gens[i]->allocate(size, is_tlab); | |
| 328 if (res != NULL) return res; | |
| 329 else if (first_only) break; | |
| 330 } | |
| 331 } | |
| 332 // Otherwise... | |
| 333 return NULL; | |
| 334 } | |
| 335 | |
| 336 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
| 337 bool* gc_overhead_limit_was_exceeded) { | |
| 338 return collector_policy()->mem_allocate_work(size, | |
|
3774
c9ca3f51cf41
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
3772
diff
changeset
|
339 false /* is_tlab */, |
| 0 | 340 gc_overhead_limit_was_exceeded); |
| 341 } | |
| 342 | |
| 343 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
| 344 return _gc_cause == GCCause::_last_ditch_collection; | |
| 345 } | |
| 346 | |
| 347 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
|
1520
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
1387
diff
changeset
|
348 return UseConcMarkSweepGC && |
|
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
1387
diff
changeset
|
349 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
1387
diff
changeset
|
350 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
| 0 | 351 } |
| 352 | |
| 353 void GenCollectedHeap::do_collection(bool full, | |
| 354 bool clear_all_soft_refs, | |
| 355 size_t size, | |
| 356 bool is_tlab, | |
| 357 int max_level) { | |
| 358 bool prepared_for_verification = false; | |
| 359 ResourceMark rm; | |
| 360 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
| 361 | |
| 362 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 363 assert(my_thread->is_VM_thread() || | |
| 364 my_thread->is_ConcurrentGC_thread(), | |
| 365 "incorrect thread type capability"); | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
366 assert(Heap_lock->is_locked(), |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
367 "the requesting thread should have the Heap_lock"); |
| 0 | 368 guarantee(!is_gc_active(), "collection is not reentrant"); |
| 369 assert(max_level < n_gens(), "sanity check"); | |
| 370 | |
| 371 if (GC_locker::check_active_before_gc()) { | |
| 372 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 373 } | |
| 374 | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
375 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
376 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
377 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
378 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
379 |
|
10183
868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
jmasa
parents:
10179
diff
changeset
|
380 const size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
| 0 | 381 |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4728
diff
changeset
|
382 print_heap_before_gc(); |
| 0 | 383 |
| 384 { | |
| 385 FlagSetting fl(_is_gc_active, true); | |
| 386 | |
| 387 bool complete = full && (max_level == (n_gens()-1)); | |
|
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6008
diff
changeset
|
388 const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
| 0 | 389 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 390 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 10405 | 391 GCTraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, NULL); |
| 0 | 392 |
| 393 gc_prologue(complete); | |
| 394 increment_total_collections(complete); | |
| 395 | |
| 396 size_t gch_prev_used = used(); | |
| 397 | |
| 398 int starting_level = 0; | |
| 399 if (full) { | |
| 400 // Search for the oldest generation which will collect all younger | |
| 401 // generations, and start collection loop there. | |
| 402 for (int i = max_level; i >= 0; i--) { | |
| 403 if (_gens[i]->full_collects_younger_generations()) { | |
| 404 starting_level = i; | |
| 405 break; | |
| 406 } | |
| 407 } | |
| 408 } | |
| 409 | |
| 410 bool must_restore_marks_for_biased_locking = false; | |
| 411 | |
| 412 int max_level_collected = starting_level; | |
| 413 for (int i = starting_level; i <= max_level; i++) { | |
| 414 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
|
880
2b4230d1e589
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
457
diff
changeset
|
415 if (i == n_gens() - 1) { // a major collection is to happen |
|
2b4230d1e589
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
457
diff
changeset
|
416 if (!complete) { |
|
2b4230d1e589
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
457
diff
changeset
|
417 // The full_collections increment was missed above. |
|
2b4230d1e589
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
457
diff
changeset
|
418 increment_total_full_collections(); |
|
2b4230d1e589
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
457
diff
changeset
|
419 } |
| 10405 | 420 pre_full_gc_dump(NULL); // do any pre full gc dumps |
|
880
2b4230d1e589
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
457
diff
changeset
|
421 } |
| 0 | 422 // Timer for individual generations. Last argument is false: no CR |
| 10405 | 423 // FIXME: We should try to start the timing earlier to cover more of the GC pause |
| 424 GCTraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, NULL); | |
| 0 | 425 TraceCollectorStats tcs(_gens[i]->counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
2426
diff
changeset
|
426 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
| 0 | 427 |
| 428 size_t prev_used = _gens[i]->used(); | |
| 429 _gens[i]->stat_record()->invocations++; | |
| 430 _gens[i]->stat_record()->accumulated_time.start(); | |
| 431 | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
432 // Must be done anew before each collection because |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
433 // a previous collection will do mangling and will |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
434 // change top of some spaces. |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
435 record_gen_tops_before_GC(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
436 |
| 0 | 437 if (PrintGC && Verbose) { |
| 438 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
| 439 i, | |
| 440 _gens[i]->stat_record()->invocations, | |
| 441 size*HeapWordSize); | |
| 442 } | |
| 443 | |
| 444 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
| 445 total_collections() >= VerifyGCStartAt) { | |
| 446 HandleMark hm; // Discard invalid handles created during verification | |
| 447 if (!prepared_for_verification) { | |
| 448 prepare_for_verify(); | |
| 449 prepared_for_verification = true; | |
| 450 } | |
|
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10183
diff
changeset
|
451 Universe::verify(" VerifyBeforeGC:"); |
| 0 | 452 } |
| 453 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 454 | |
| 455 if (!must_restore_marks_for_biased_locking && | |
| 456 _gens[i]->performs_in_place_marking()) { | |
| 457 // We perform this mark word preservation work lazily | |
| 458 // because it's only at this point that we know whether we | |
| 459 // absolutely have to do it; we want to avoid doing it for | |
| 460 // scavenge-only collections where it's unnecessary | |
| 461 must_restore_marks_for_biased_locking = true; | |
| 462 BiasedLocking::preserve_marks(); | |
| 463 } | |
| 464 | |
| 465 // Do collection work | |
| 466 { | |
| 467 // Note on ref discovery: For what appear to be historical reasons, | |
| 468 // GCH enables and disabled (by enqueing) refs discovery. | |
| 469 // In the future this should be moved into the generation's | |
| 470 // collect method so that ref discovery and enqueueing concerns | |
| 471 // are local to a generation. The collect method could return | |
| 472 // an appropriate indication in the case that notification on | |
| 473 // the ref lock was needed. This will make the treatment of | |
| 474 // weak refs more uniform (and indeed remove such concerns | |
| 475 // from GCH). XXX | |
| 476 | |
| 477 HandleMark hm; // Discard invalid handles created during gc | |
| 478 save_marks(); // save marks for all gens | |
| 479 // We want to discover references, but not process them yet. | |
| 480 // This mode is disabled in process_discovered_references if the | |
| 481 // generation does some collection work, or in | |
| 482 // enqueue_discovered_references if the generation returns | |
| 483 // without doing any work. | |
| 484 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
| 485 // If the discovery of ("weak") refs in this generation is | |
| 486 // atomic wrt other collectors in this configuration, we | |
| 487 // are guaranteed to have empty discovered ref lists. | |
| 488 if (rp->discovery_is_atomic()) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3915
diff
changeset
|
489 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
490 rp->setup_policy(do_clear_all_soft_refs); |
| 0 | 491 } else { |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
269
diff
changeset
|
492 // collect() below will enable discovery as appropriate |
| 0 | 493 } |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1170
diff
changeset
|
494 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
| 0 | 495 if (!rp->enqueuing_is_done()) { |
| 496 rp->enqueue_discovered_references(); | |
| 497 } else { | |
| 498 rp->set_enqueuing_is_done(false); | |
| 499 } | |
| 500 rp->verify_no_references_recorded(); | |
| 501 } | |
| 502 max_level_collected = i; | |
| 503 | |
| 504 // Determine if allocation request was met. | |
| 505 if (size > 0) { | |
| 506 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
| 507 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
| 508 size = 0; | |
| 509 } | |
| 510 } | |
| 511 } | |
| 512 | |
| 513 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 514 | |
| 515 _gens[i]->stat_record()->accumulated_time.stop(); | |
| 516 | |
| 517 update_gc_stats(i, full); | |
| 518 | |
| 519 if (VerifyAfterGC && i >= VerifyGCLevel && | |
| 520 total_collections() >= VerifyGCStartAt) { | |
| 521 HandleMark hm; // Discard invalid handles created during verification | |
|
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10183
diff
changeset
|
522 Universe::verify(" VerifyAfterGC:"); |
| 0 | 523 } |
| 524 | |
| 525 if (PrintGCDetails) { | |
| 526 gclog_or_tty->print(":"); | |
| 527 _gens[i]->print_heap_change(prev_used); | |
| 528 } | |
| 529 } | |
| 530 } | |
| 531 | |
| 532 // Update "complete" boolean wrt what actually transpired -- | |
| 533 // for instance, a promotion failure could have led to | |
| 534 // a whole heap collection. | |
| 535 complete = complete || (max_level_collected == n_gens() - 1); | |
| 536 | |
|
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
537 if (complete) { // We did a "major" collection |
| 10405 | 538 // FIXME: See comment at pre_full_gc_dump call |
| 539 post_full_gc_dump(NULL); // do any post full gc dumps | |
|
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
540 } |
|
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
546
diff
changeset
|
541 |
| 0 | 542 if (PrintGCDetails) { |
| 543 print_heap_change(gch_prev_used); | |
| 544 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
545 // Print metaspace info for full GC with PrintGCDetails flag. |
| 0 | 546 if (complete) { |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
547 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
| 0 | 548 } |
| 549 } | |
| 550 | |
| 551 for (int j = max_level_collected; j >= 0; j -= 1) { | |
| 552 // Adjust generation sizes. | |
| 553 _gens[j]->compute_new_size(); | |
| 554 } | |
| 555 | |
| 556 if (complete) { | |
|
8784
79af1312fc2c
8005602: NPG: classunloading does not happen while CMS GC with -XX:+CMSClassUnloadingEnabled is used
mgerdin
parents:
8001
diff
changeset
|
557 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
|
79af1312fc2c
8005602: NPG: classunloading does not happen while CMS GC with -XX:+CMSClassUnloadingEnabled is used
mgerdin
parents:
8001
diff
changeset
|
558 ClassLoaderDataGraph::purge(); |
|
10183
868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
jmasa
parents:
10179
diff
changeset
|
559 MetaspaceAux::verify_metrics(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
560 // Resize the metaspace capacity after full collections |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
561 MetaspaceGC::compute_new_size(); |
| 0 | 562 update_full_collections_completed(); |
| 563 } | |
| 564 | |
| 565 // Track memory usage and detect low memory after GC finishes | |
| 566 MemoryService::track_memory_usage(); | |
| 567 | |
| 568 gc_epilogue(complete); | |
| 569 | |
| 570 if (must_restore_marks_for_biased_locking) { | |
| 571 BiasedLocking::restore_marks(); | |
| 572 } | |
| 573 } | |
| 574 | |
| 575 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
| 576 AdaptiveSizePolicyOutput(sp, total_collections()); | |
| 577 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4728
diff
changeset
|
578 print_heap_after_gc(); |
| 0 | 579 |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
517
diff
changeset
|
580 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
517
diff
changeset
|
581 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
517
diff
changeset
|
582 #endif |
| 0 | 583 } |
| 584 | |
| 585 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
| 586 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
| 587 } | |
| 588 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4712
diff
changeset
|
589 void GenCollectedHeap::set_par_threads(uint t) { |
| 0 | 590 SharedHeap::set_par_threads(t); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1681
diff
changeset
|
591 _gen_process_strong_tasks->set_n_threads(t); |
| 0 | 592 } |
| 593 | |
| 594 void GenCollectedHeap:: | |
| 595 gen_process_strong_roots(int level, | |
| 596 bool younger_gens_as_roots, | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
597 bool activate_scope, |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
598 bool is_scavenging, |
| 0 | 599 SharedHeap::ScanningOption so, |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
600 OopsInGenClosure* not_older_gens, |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
601 bool do_code_roots, |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
602 OopsInGenClosure* older_gens, |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
603 KlassClosure* klass_closure) { |
| 0 | 604 // General strong roots. |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
605 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
606 if (!do_code_roots) { |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
607 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
608 not_older_gens, NULL, klass_closure); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
609 } else { |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
610 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
611 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
612 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
613 not_older_gens, &code_roots, klass_closure); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
881
diff
changeset
|
614 } |
| 0 | 615 |
| 616 if (younger_gens_as_roots) { | |
| 617 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
| 618 for (int i = 0; i < level; i++) { | |
| 619 not_older_gens->set_generation(_gens[i]); | |
| 620 _gens[i]->oop_iterate(not_older_gens); | |
| 621 } | |
| 622 not_older_gens->reset_generation(); | |
| 623 } | |
| 624 } | |
| 625 // When collection is parallel, all threads get to cooperate to do | |
| 626 // older-gen scanning. | |
| 627 for (int i = level+1; i < _n_gens; i++) { | |
| 628 older_gens->set_generation(_gens[i]); | |
| 629 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
| 630 older_gens->reset_generation(); | |
| 631 } | |
| 632 | |
| 633 _gen_process_strong_tasks->all_tasks_completed(); | |
| 634 } | |
| 635 | |
| 636 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
|
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
9076
diff
changeset
|
637 CodeBlobClosure* code_roots) { |
|
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
9076
diff
changeset
|
638 SharedHeap::process_weak_roots(root_closure, code_roots); |
| 0 | 639 // "Local" "weak" refs |
| 640 for (int i = 0; i < _n_gens; i++) { | |
| 641 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
| 642 } | |
| 643 } | |
| 644 | |
| 645 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 646 void GenCollectedHeap:: \ | |
| 647 oop_since_save_marks_iterate(int level, \ | |
| 648 OopClosureType* cur, \ | |
| 649 OopClosureType* older) { \ | |
| 650 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
| 651 for (int i = level+1; i < n_gens(); i++) { \ | |
| 652 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 653 } \ | |
| 654 } | |
| 655 | |
| 656 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 657 | |
| 658 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 659 | |
| 660 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
| 661 for (int i = level; i < _n_gens; i++) { | |
| 662 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
| 663 } | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
664 return true; |
| 0 | 665 } |
| 666 | |
| 667 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
| 668 return _gens[0]->supports_inline_contig_alloc(); | |
| 669 } | |
| 670 | |
| 671 HeapWord** GenCollectedHeap::top_addr() const { | |
| 672 return _gens[0]->top_addr(); | |
| 673 } | |
| 674 | |
| 675 HeapWord** GenCollectedHeap::end_addr() const { | |
| 676 return _gens[0]->end_addr(); | |
| 677 } | |
| 678 | |
| 679 size_t GenCollectedHeap::unsafe_max_alloc() { | |
| 680 return _gens[0]->unsafe_max_alloc_nogc(); | |
| 681 } | |
| 682 | |
| 683 // public collection interfaces | |
| 684 | |
| 685 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
| 686 if (should_do_concurrent_full_gc(cause)) { | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
687 #if INCLUDE_ALL_GCS |
| 0 | 688 // mostly concurrent full collection |
| 689 collect_mostly_concurrent(cause); | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
690 #else // INCLUDE_ALL_GCS |
| 0 | 691 ShouldNotReachHere(); |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
692 #endif // INCLUDE_ALL_GCS |
| 0 | 693 } else { |
| 694 #ifdef ASSERT | |
| 695 if (cause == GCCause::_scavenge_alot) { | |
| 696 // minor collection only | |
| 697 collect(cause, 0); | |
| 698 } else { | |
| 699 // Stop-the-world full collection | |
| 700 collect(cause, n_gens() - 1); | |
| 701 } | |
| 702 #else | |
| 703 // Stop-the-world full collection | |
| 704 collect(cause, n_gens() - 1); | |
| 705 #endif | |
| 706 } | |
| 707 } | |
| 708 | |
| 709 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
| 710 // The caller doesn't have the Heap_lock | |
| 711 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 712 MutexLocker ml(Heap_lock); | |
| 713 collect_locked(cause, max_level); | |
| 714 } | |
| 715 | |
| 716 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 717 // The caller has the Heap_lock | |
| 718 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
| 719 collect_locked(cause, n_gens() - 1); | |
| 720 } | |
| 721 | |
| 722 // this is the private collection interface | |
| 723 // The Heap_lock is expected to be held on entry. | |
| 724 | |
| 725 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
| 726 // Read the GC count while holding the Heap_lock | |
| 727 unsigned int gc_count_before = total_collections(); | |
| 728 unsigned int full_gc_count_before = total_full_collections(); | |
| 729 { | |
| 730 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 731 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
| 732 cause, max_level); | |
| 733 VMThread::execute(&op); | |
| 734 } | |
| 735 } | |
| 736 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
737 #if INCLUDE_ALL_GCS |
| 0 | 738 bool GenCollectedHeap::create_cms_collector() { |
| 739 | |
| 740 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
741 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)), |
| 0 | 742 "Unexpected generation kinds"); |
| 743 // Skip two header words in the block content verification | |
| 744 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
| 745 CMSCollector* collector = new CMSCollector( | |
| 746 (ConcurrentMarkSweepGeneration*)_gens[1], | |
| 747 _rem_set->as_CardTableRS(), | |
| 748 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
| 749 | |
| 750 if (collector == NULL || !collector->completed_initialization()) { | |
| 751 if (collector) { | |
| 752 delete collector; // Be nice in embedded situation | |
| 753 } | |
| 754 vm_shutdown_during_initialization("Could not create CMS collector"); | |
| 755 return false; | |
| 756 } | |
| 757 return true; // success | |
| 758 } | |
| 759 | |
| 760 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
| 761 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
| 762 | |
| 763 MutexLocker ml(Heap_lock); | |
| 764 // Read the GC counts while holding the Heap_lock | |
| 765 unsigned int full_gc_count_before = total_full_collections(); | |
| 766 unsigned int gc_count_before = total_collections(); | |
| 767 { | |
| 768 MutexUnlocker mu(Heap_lock); | |
| 769 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
| 770 VMThread::execute(&op); | |
| 771 } | |
| 772 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
773 #endif // INCLUDE_ALL_GCS |
| 0 | 774 |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
775 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
776 do_full_collection(clear_all_soft_refs, _n_gens - 1); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
777 } |
| 0 | 778 |
| 779 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
| 780 int max_level) { | |
| 781 int local_max_level; | |
|
1994
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
1972
diff
changeset
|
782 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
| 0 | 783 gc_cause() == GCCause::_gc_locker) { |
| 784 local_max_level = 0; | |
| 785 } else { | |
| 786 local_max_level = max_level; | |
| 787 } | |
| 788 | |
| 789 do_collection(true /* full */, | |
| 790 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 791 0 /* size */, | |
| 792 false /* is_tlab */, | |
| 793 local_max_level /* max_level */); | |
| 794 // Hack XXX FIX ME !!! | |
| 795 // A scavenge may not have been attempted, or may have | |
| 796 // been attempted and failed, because the old gen was too full | |
| 797 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
|
1994
6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
1972
diff
changeset
|
798 incremental_collection_will_fail(false /* don't consult_young */)) { |
| 0 | 799 if (PrintGCDetails) { |
| 800 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
| 801 "because scavenge failed"); | |
| 802 } | |
| 803 // This time allow the old gen to be collected as well | |
| 804 do_collection(true /* full */, | |
| 805 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 806 0 /* size */, | |
| 807 false /* is_tlab */, | |
| 808 n_gens() - 1 /* max_level */); | |
| 809 } | |
| 810 } | |
| 811 | |
|
3377
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
812 bool GenCollectedHeap::is_in_young(oop p) { |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
813 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
814 assert(result == _gens[0]->is_in_reserved(p), |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
815 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, (void*)p)); |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
816 return result; |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
817 } |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
818 |
| 4708 | 819 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 0 | 820 bool GenCollectedHeap::is_in(const void* p) const { |
| 821 #ifndef ASSERT | |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
822 guarantee(VerifyBeforeGC || |
|
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
823 VerifyDuringGC || |
|
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
824 VerifyBeforeExit || |
|
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
825 VerifyDuringStartup || |
|
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
826 PrintAssembly || |
|
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
827 tty->count() != 0 || // already printing |
|
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8784
diff
changeset
|
828 VerifyAfterGC || |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1626
diff
changeset
|
829 VMError::fatal_error_in_progress(), "too expensive"); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1626
diff
changeset
|
830 |
| 0 | 831 #endif |
| 832 // This might be sped up with a cache of the last generation that | |
| 833 // answered yes. | |
| 834 for (int i = 0; i < _n_gens; i++) { | |
| 835 if (_gens[i]->is_in(p)) return true; | |
| 836 } | |
| 837 // Otherwise... | |
| 838 return false; | |
| 839 } | |
| 840 | |
|
3377
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
841 #ifdef ASSERT |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
842 // Don't implement this by using is_in_young(). This method is used |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
843 // in some cases to check that is_in_young() is correct. |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
844 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
845 assert(is_in_reserved(p) || p == NULL, |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
846 "Does not work if address is non-null and outside of the heap"); |
|
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
847 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
| 0 | 848 } |
|
3377
2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
3356
diff
changeset
|
849 #endif |
| 0 | 850 |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
851 void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 852 for (int i = 0; i < _n_gens; i++) { |
| 853 _gens[i]->oop_iterate(cl); | |
| 854 } | |
| 855 } | |
| 856 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
857 void GenCollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
| 0 | 858 for (int i = 0; i < _n_gens; i++) { |
| 859 _gens[i]->oop_iterate(mr, cl); | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 864 for (int i = 0; i < _n_gens; i++) { | |
| 865 _gens[i]->object_iterate(cl); | |
| 866 } | |
| 867 } | |
| 868 | |
|
517
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
457
diff
changeset
|
869 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
457
diff
changeset
|
870 for (int i = 0; i < _n_gens; i++) { |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
457
diff
changeset
|
871 _gens[i]->safe_object_iterate(cl); |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
457
diff
changeset
|
872 } |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
457
diff
changeset
|
873 } |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
457
diff
changeset
|
874 |
| 0 | 875 Space* GenCollectedHeap::space_containing(const void* addr) const { |
| 876 for (int i = 0; i < _n_gens; i++) { | |
| 877 Space* res = _gens[i]->space_containing(addr); | |
| 878 if (res != NULL) return res; | |
| 879 } | |
| 880 // Otherwise... | |
| 881 assert(false, "Could not find containing space"); | |
| 882 return NULL; | |
| 883 } | |
| 884 | |
| 885 | |
| 886 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
| 887 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
| 888 for (int i = 0; i < _n_gens; i++) { | |
| 889 if (_gens[i]->is_in_reserved(addr)) { | |
| 890 assert(_gens[i]->is_in(addr), | |
| 891 "addr should be in allocated part of generation"); | |
| 892 return _gens[i]->block_start(addr); | |
| 893 } | |
| 894 } | |
| 895 assert(false, "Some generation should contain the address"); | |
| 896 return NULL; | |
| 897 } | |
| 898 | |
| 899 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
| 900 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
| 901 for (int i = 0; i < _n_gens; i++) { | |
| 902 if (_gens[i]->is_in_reserved(addr)) { | |
| 903 assert(_gens[i]->is_in(addr), | |
| 904 "addr should be in allocated part of generation"); | |
| 905 return _gens[i]->block_size(addr); | |
| 906 } | |
| 907 } | |
| 908 assert(false, "Some generation should contain the address"); | |
| 909 return 0; | |
| 910 } | |
| 911 | |
| 912 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 913 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
| 914 assert(block_start(addr) == addr, "addr must be a block start"); | |
| 915 for (int i = 0; i < _n_gens; i++) { | |
| 916 if (_gens[i]->is_in_reserved(addr)) { | |
| 917 return _gens[i]->block_is_obj(addr); | |
| 918 } | |
| 919 } | |
| 920 assert(false, "Some generation should contain the address"); | |
| 921 return false; | |
| 922 } | |
| 923 | |
| 924 bool GenCollectedHeap::supports_tlab_allocation() const { | |
| 925 for (int i = 0; i < _n_gens; i += 1) { | |
| 926 if (_gens[i]->supports_tlab_allocation()) { | |
| 927 return true; | |
| 928 } | |
| 929 } | |
| 930 return false; | |
| 931 } | |
| 932 | |
| 933 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
| 934 size_t result = 0; | |
| 935 for (int i = 0; i < _n_gens; i += 1) { | |
| 936 if (_gens[i]->supports_tlab_allocation()) { | |
| 937 result += _gens[i]->tlab_capacity(); | |
| 938 } | |
| 939 } | |
| 940 return result; | |
| 941 } | |
| 942 | |
| 943 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 944 size_t result = 0; | |
| 945 for (int i = 0; i < _n_gens; i += 1) { | |
| 946 if (_gens[i]->supports_tlab_allocation()) { | |
| 947 result += _gens[i]->unsafe_max_tlab_alloc(); | |
| 948 } | |
| 949 } | |
| 950 return result; | |
| 951 } | |
| 952 | |
| 953 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
| 954 bool gc_overhead_limit_was_exceeded; | |
|
3774
c9ca3f51cf41
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
3772
diff
changeset
|
955 return collector_policy()->mem_allocate_work(size /* size */, |
|
c9ca3f51cf41
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
3772
diff
changeset
|
956 true /* is_tlab */, |
|
c9ca3f51cf41
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
3772
diff
changeset
|
957 &gc_overhead_limit_was_exceeded); |
| 0 | 958 } |
| 959 | |
| 960 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
| 961 // from the list headed by "*prev_ptr". | |
| 962 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
| 963 bool first = true; | |
| 964 size_t min_size = 0; // "first" makes this conceptually infinite. | |
| 965 ScratchBlock **smallest_ptr, *smallest; | |
| 966 ScratchBlock *cur = *prev_ptr; | |
| 967 while (cur) { | |
| 968 assert(*prev_ptr == cur, "just checking"); | |
| 969 if (first || cur->num_words < min_size) { | |
| 970 smallest_ptr = prev_ptr; | |
| 971 smallest = cur; | |
| 972 min_size = smallest->num_words; | |
| 973 first = false; | |
| 974 } | |
| 975 prev_ptr = &cur->next; | |
| 976 cur = cur->next; | |
| 977 } | |
| 978 smallest = *smallest_ptr; | |
| 979 *smallest_ptr = smallest->next; | |
| 980 return smallest; | |
| 981 } | |
| 982 | |
| 983 // Sort the scratch block list headed by res into decreasing size order, | |
| 984 // and set "res" to the result. | |
| 985 static void sort_scratch_list(ScratchBlock*& list) { | |
| 986 ScratchBlock* sorted = NULL; | |
| 987 ScratchBlock* unsorted = list; | |
| 988 while (unsorted) { | |
| 989 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
| 990 smallest->next = sorted; | |
| 991 sorted = smallest; | |
| 992 } | |
| 993 list = sorted; | |
| 994 } | |
| 995 | |
| 996 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
| 997 size_t max_alloc_words) { | |
| 998 ScratchBlock* res = NULL; | |
| 999 for (int i = 0; i < _n_gens; i++) { | |
| 1000 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
| 1001 } | |
| 1002 sort_scratch_list(res); | |
| 1003 return res; | |
| 1004 } | |
| 1005 | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1006 void GenCollectedHeap::release_scratch() { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1007 for (int i = 0; i < _n_gens; i++) { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1008 _gens[i]->reset_scratch(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1009 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1010 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1011 |
| 0 | 1012 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
| 1013 void do_generation(Generation* gen) { | |
| 1014 gen->prepare_for_verify(); | |
| 1015 } | |
| 1016 }; | |
| 1017 | |
| 1018 void GenCollectedHeap::prepare_for_verify() { | |
| 1019 ensure_parsability(false); // no need to retire TLABs | |
| 1020 GenPrepareForVerifyClosure blk; | |
| 1021 generation_iterate(&blk, false); | |
| 1022 } | |
| 1023 | |
| 1024 | |
| 1025 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
| 1026 bool old_to_young) { | |
| 1027 if (old_to_young) { | |
| 1028 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1029 cl->do_generation(_gens[i]); | |
| 1030 } | |
| 1031 } else { | |
| 1032 for (int i = 0; i < _n_gens; i++) { | |
| 1033 cl->do_generation(_gens[i]); | |
| 1034 } | |
| 1035 } | |
| 1036 } | |
| 1037 | |
| 1038 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1039 for (int i = 0; i < _n_gens; i++) { | |
| 1040 _gens[i]->space_iterate(cl, true); | |
| 1041 } | |
| 1042 } | |
| 1043 | |
| 1044 bool GenCollectedHeap::is_maximal_no_gc() const { | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
1045 for (int i = 0; i < _n_gens; i++) { |
| 0 | 1046 if (!_gens[i]->is_maximal_no_gc()) { |
| 1047 return false; | |
| 1048 } | |
| 1049 } | |
| 1050 return true; | |
| 1051 } | |
| 1052 | |
| 1053 void GenCollectedHeap::save_marks() { | |
| 1054 for (int i = 0; i < _n_gens; i++) { | |
| 1055 _gens[i]->save_marks(); | |
| 1056 } | |
| 1057 } | |
| 1058 | |
| 1059 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
| 1060 for (int i = 0; i <= collectedGen; i++) { | |
| 1061 _gens[i]->compute_new_size(); | |
| 1062 } | |
| 1063 } | |
| 1064 | |
| 1065 GenCollectedHeap* GenCollectedHeap::heap() { | |
| 1066 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
| 1067 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
| 1068 return _gch; | |
| 1069 } | |
| 1070 | |
| 1071 | |
| 1072 void GenCollectedHeap::prepare_for_compaction() { | |
|
12030
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1073 guarantee(_n_gens = 2, "Wrong number of generations"); |
|
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1074 Generation* old_gen = _gens[1]; |
| 0 | 1075 // Start by compacting into same gen. |
|
12030
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1076 CompactPoint cp(old_gen, NULL, NULL); |
|
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1077 old_gen->prepare_for_compaction(&cp); |
|
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1078 Generation* young_gen = _gens[0]; |
|
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1079 young_gen->prepare_for_compaction(&cp); |
| 0 | 1080 } |
| 1081 | |
| 1082 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
| 1083 return _gens[level]->gc_stats(); | |
| 1084 } | |
| 1085 | |
| 6008 | 1086 void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 1087 for (int i = _n_gens-1; i >= 0; i--) { |
| 1088 Generation* g = _gens[i]; | |
| 1089 if (!silent) { | |
| 1090 gclog_or_tty->print(g->name()); | |
| 1091 gclog_or_tty->print(" "); | |
| 1092 } | |
| 6008 | 1093 g->verify(); |
| 0 | 1094 } |
| 1095 if (!silent) { | |
| 1096 gclog_or_tty->print("remset "); | |
| 1097 } | |
| 1098 rem_set()->verify(); | |
| 1099 } | |
| 1100 | |
| 1101 void GenCollectedHeap::print_on(outputStream* st) const { | |
| 1102 for (int i = 0; i < _n_gens; i++) { | |
| 1103 _gens[i]->print_on(st); | |
| 1104 } | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
1105 MetaspaceAux::print_on(st); |
| 0 | 1106 } |
| 1107 | |
| 1108 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 1109 if (workers() != NULL) { | |
| 1110 workers()->threads_do(tc); | |
| 1111 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
1112 #if INCLUDE_ALL_GCS |
| 0 | 1113 if (UseConcMarkSweepGC) { |
| 1114 ConcurrentMarkSweepThread::threads_do(tc); | |
| 1115 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
1116 #endif // INCLUDE_ALL_GCS |
| 0 | 1117 } |
| 1118 | |
| 1119 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
1120 #if INCLUDE_ALL_GCS |
| 0 | 1121 if (UseParNewGC) { |
| 1122 workers()->print_worker_threads_on(st); | |
| 1123 } | |
| 1124 if (UseConcMarkSweepGC) { | |
| 1125 ConcurrentMarkSweepThread::print_all_on(st); | |
| 1126 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
6865
diff
changeset
|
1127 #endif // INCLUDE_ALL_GCS |
| 0 | 1128 } |
| 1129 | |
|
9076
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1130 void GenCollectedHeap::print_on_error(outputStream* st) const { |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1131 this->CollectedHeap::print_on_error(st); |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1132 |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1133 #if INCLUDE_ALL_GCS |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1134 if (UseConcMarkSweepGC) { |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1135 st->cr(); |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1136 CMSCollector::print_on_error(st); |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1137 } |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1138 #endif // INCLUDE_ALL_GCS |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1139 } |
|
7b835924c31c
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
9071
diff
changeset
|
1140 |
| 0 | 1141 void GenCollectedHeap::print_tracing_info() const { |
| 1142 if (TraceGen0Time) { | |
| 1143 get_gen(0)->print_summary_info(); | |
| 1144 } | |
| 1145 if (TraceGen1Time) { | |
| 1146 get_gen(1)->print_summary_info(); | |
| 1147 } | |
| 1148 } | |
| 1149 | |
| 1150 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
| 1151 if (PrintGCDetails && Verbose) { | |
| 1152 gclog_or_tty->print(" " SIZE_FORMAT | |
| 1153 "->" SIZE_FORMAT | |
| 1154 "(" SIZE_FORMAT ")", | |
| 1155 prev_used, used(), capacity()); | |
| 1156 } else { | |
| 1157 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 1158 "->" SIZE_FORMAT "K" | |
| 1159 "(" SIZE_FORMAT "K)", | |
| 1160 prev_used / K, used() / K, capacity() / K); | |
| 1161 } | |
| 1162 } | |
| 1163 | |
| 1164 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
| 1165 private: | |
| 1166 bool _full; | |
| 1167 public: | |
| 1168 void do_generation(Generation* gen) { | |
| 1169 gen->gc_prologue(_full); | |
| 1170 } | |
| 1171 GenGCPrologueClosure(bool full) : _full(full) {}; | |
| 1172 }; | |
| 1173 | |
| 1174 void GenCollectedHeap::gc_prologue(bool full) { | |
| 1175 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 1176 | |
| 1177 always_do_update_barrier = false; | |
| 1178 // Fill TLAB's and such | |
| 1179 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 1180 ensure_parsability(true); // retire TLABs | |
| 1181 | |
| 1182 // Walk generations | |
| 1183 GenGCPrologueClosure blk(full); | |
| 1184 generation_iterate(&blk, false); // not old-to-young. | |
| 1185 }; | |
| 1186 | |
| 1187 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
| 1188 private: | |
| 1189 bool _full; | |
| 1190 public: | |
| 1191 void do_generation(Generation* gen) { | |
| 1192 gen->gc_epilogue(_full); | |
| 1193 } | |
| 1194 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
| 1195 }; | |
| 1196 | |
| 1197 void GenCollectedHeap::gc_epilogue(bool full) { | |
| 1198 #ifdef COMPILER2 | |
| 1199 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
| 1200 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
| 1201 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
| 1202 #endif /* COMPILER2 */ | |
| 1203 | |
| 1204 resize_all_tlabs(); | |
| 1205 | |
| 1206 GenGCEpilogueClosure blk(full); | |
| 1207 generation_iterate(&blk, false); // not old-to-young. | |
| 1208 | |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3774
diff
changeset
|
1209 if (!CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3774
diff
changeset
|
1210 Chunk::clean_chunk_pool(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3774
diff
changeset
|
1211 } |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3774
diff
changeset
|
1212 |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
1213 MetaspaceCounters::update_performance_counters(); |
|
12063
1a8fb39bdbc4
8014659: NPG: performance counters for compressed klass space
ehelin
parents:
12030
diff
changeset
|
1214 CompressedClassSpaceCounters::update_performance_counters(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6109
diff
changeset
|
1215 |
| 0 | 1216 always_do_update_barrier = UseConcMarkSweepGC; |
| 1217 }; | |
| 1218 | |
|
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1219 #ifndef PRODUCT |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1220 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1221 private: |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1222 public: |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1223 void do_generation(Generation* gen) { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1224 gen->record_spaces_top(); |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1225 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1226 }; |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1227 |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1228 void GenCollectedHeap::record_gen_tops_before_GC() { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1229 if (ZapUnusedHeapArea) { |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1230 GenGCSaveTopsBeforeGCClosure blk; |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1231 generation_iterate(&blk, false); // not old-to-young. |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1232 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1233 } |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1234 #endif // not PRODUCT |
|
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
113
diff
changeset
|
1235 |
| 0 | 1236 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
| 1237 public: | |
| 1238 void do_generation(Generation* gen) { | |
| 1239 gen->ensure_parsability(); | |
| 1240 } | |
| 1241 }; | |
| 1242 | |
| 1243 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
| 1244 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 1245 GenEnsureParsabilityClosure ep_cl; | |
| 1246 generation_iterate(&ep_cl, false); | |
| 1247 } | |
| 1248 | |
|
12030
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1249 oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
| 0 | 1250 oop obj, |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
1251 size_t obj_size) { |
|
12030
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1252 guarantee(old_gen->level() == 1, "We only get here with an old generation"); |
| 0 | 1253 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 1254 HeapWord* result = NULL; | |
| 1255 | |
|
12030
330dfb0476f4
8022800: Use specific generations rather than generation iteration
brutisso
parents:
11096
diff
changeset
|
1256 result = old_gen->expand_and_allocate(obj_size, false); |
| 0 | 1257 |
| 1258 if (result != NULL) { | |
| 1259 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 1260 } | |
| 1261 return oop(result); | |
| 1262 } | |
| 1263 | |
| 1264 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
| 1265 jlong _time; // in ms | |
| 1266 jlong _now; // in ms | |
| 1267 | |
| 1268 public: | |
| 1269 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
| 1270 | |
| 1271 jlong time() { return _time; } | |
| 1272 | |
| 1273 void do_generation(Generation* gen) { | |
| 1274 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
| 1275 } | |
| 1276 }; | |
| 1277 | |
| 1278 jlong GenCollectedHeap::millis_since_last_gc() { | |
|
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1279 // We need a monotonically non-deccreasing time in ms but |
|
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1280 // os::javaTimeMillis() does not guarantee monotonicity. |
|
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1281 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
| 0 | 1282 GenTimeOfLastGCClosure tolgc_cl(now); |
| 1283 // iterate over generations getting the oldest | |
| 1284 // time that a generation was collected | |
| 1285 generation_iterate(&tolgc_cl, false); | |
|
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1286 |
|
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1287 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
|
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1288 // provided the underlying platform provides such a time source |
|
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1289 // (and it is bug free). So we still have to guard against getting |
|
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1290 // back a time later than 'now'. |
| 0 | 1291 jlong retVal = now - tolgc_cl.time(); |
| 1292 if (retVal < 0) { | |
|
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4708
diff
changeset
|
1293 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, retVal);) |
| 0 | 1294 return 0; |
| 1295 } | |
| 1296 return retVal; | |
| 1297 } |