Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 3915:c2bf0120ee5d
7085906: Replace the permgen allocated sentinelRef with a self-looped end
Summary: Remove the sentinelRef and let the last Reference in a discovered chain point back to itself.
Reviewed-by: ysr, jmasa
| author | stefank |
|---|---|
| date | Thu, 01 Sep 2011 16:18:17 +0200 |
| parents | 48048b59a551 |
| children | 4dfb2df418f2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2011, 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" | |
| 31 #include "gc_implementation/shared/vmGCOperations.hpp" | |
| 32 #include "gc_interface/collectedHeap.inline.hpp" | |
| 33 #include "memory/compactPermGen.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/permGen.hpp" | |
| 41 #include "memory/resourceArea.hpp" | |
| 42 #include "memory/sharedHeap.hpp" | |
| 43 #include "memory/space.hpp" | |
| 44 #include "oops/oop.inline.hpp" | |
| 45 #include "oops/oop.inline2.hpp" | |
| 46 #include "runtime/aprofiler.hpp" | |
| 47 #include "runtime/biasedLocking.hpp" | |
| 48 #include "runtime/fprofiler.hpp" | |
| 49 #include "runtime/handles.hpp" | |
| 50 #include "runtime/handles.inline.hpp" | |
| 51 #include "runtime/java.hpp" | |
| 52 #include "runtime/vmThread.hpp" | |
| 53 #include "services/memoryService.hpp" | |
| 54 #include "utilities/vmError.hpp" | |
| 55 #include "utilities/workgroup.hpp" | |
| 56 #ifndef SERIALGC | |
| 57 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 58 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
| 59 #endif | |
| 0 | 60 |
| 61 GenCollectedHeap* GenCollectedHeap::_gch; | |
| 62 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
| 63 | |
| 64 // The set of potentially parallel tasks in strong root scanning. | |
| 65 enum GCH_process_strong_roots_tasks { | |
| 66 // We probably want to parallelize both of these internally, but for now... | |
| 67 GCH_PS_younger_gens, | |
| 68 // Leave this one last. | |
| 69 GCH_PS_NumElements | |
| 70 }; | |
| 71 | |
| 72 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
| 73 SharedHeap(policy), | |
| 74 _gen_policy(policy), | |
| 75 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
| 76 _full_collections_completed(0) | |
| 77 { | |
| 78 if (_gen_process_strong_tasks == NULL || | |
| 79 !_gen_process_strong_tasks->valid()) { | |
| 80 vm_exit_during_initialization("Failed necessary allocation."); | |
| 81 } | |
| 82 assert(policy != NULL, "Sanity check"); | |
| 83 _preloading_shared_classes = false; | |
| 84 } | |
| 85 | |
| 86 jint GenCollectedHeap::initialize() { | |
| 1166 | 87 CollectedHeap::pre_initialize(); |
| 88 | |
| 0 | 89 int i; |
| 90 _n_gens = gen_policy()->number_of_generations(); | |
| 91 | |
| 92 // While there are no constraints in the GC code that HeapWordSize | |
| 93 // be any particular value, there are multiple other areas in the | |
| 94 // system which believe this to be true (e.g. oop->object_size in some | |
| 95 // cases incorrectly returns the size in wordSize units rather than | |
| 96 // HeapWordSize). | |
| 97 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 98 | |
| 99 // The heap must be at least as aligned as generations. | |
| 100 size_t alignment = Generation::GenGrain; | |
| 101 | |
| 102 _gen_specs = gen_policy()->generations(); | |
| 103 PermanentGenerationSpec *perm_gen_spec = | |
| 104 collector_policy()->permanent_generation(); | |
| 105 | |
| 106 // Make sure the sizes are all aligned. | |
| 107 for (i = 0; i < _n_gens; i++) { | |
| 108 _gen_specs[i]->align(alignment); | |
| 109 } | |
| 110 perm_gen_spec->align(alignment); | |
| 111 | |
| 112 // If we are dumping the heap, then allocate a wasted block of address | |
| 113 // space in order to push the heap to a lower address. This extra | |
| 114 // address range allows for other (or larger) libraries to be loaded | |
| 115 // without them occupying the space required for the shared spaces. | |
| 116 | |
| 117 if (DumpSharedSpaces) { | |
| 118 uintx reserved = 0; | |
| 119 uintx block_size = 64*1024*1024; | |
| 120 while (reserved < SharedDummyBlockSize) { | |
| 121 char* dummy = os::reserve_memory(block_size); | |
| 122 reserved += block_size; | |
| 123 } | |
| 124 } | |
| 125 | |
| 126 // Allocate space for the heap. | |
| 127 | |
| 128 char* heap_address; | |
| 129 size_t total_reserved = 0; | |
| 130 int n_covered_regions = 0; | |
| 131 ReservedSpace heap_rs(0); | |
| 132 | |
| 133 heap_address = allocate(alignment, perm_gen_spec, &total_reserved, | |
| 134 &n_covered_regions, &heap_rs); | |
| 135 | |
| 136 if (UseSharedSpaces) { | |
| 137 if (!heap_rs.is_reserved() || heap_address != heap_rs.base()) { | |
| 138 if (heap_rs.is_reserved()) { | |
| 139 heap_rs.release(); | |
| 140 } | |
| 141 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 142 mapinfo->fail_continue("Unable to reserve shared region."); | |
| 143 allocate(alignment, perm_gen_spec, &total_reserved, &n_covered_regions, | |
| 144 &heap_rs); | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 if (!heap_rs.is_reserved()) { | |
| 149 vm_shutdown_during_initialization( | |
| 150 "Could not reserve enough space for object heap"); | |
| 151 return JNI_ENOMEM; | |
| 152 } | |
| 153 | |
| 154 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 155 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 156 | |
| 157 // It is important to do this in a way such that concurrent readers can't | |
| 158 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
| 159 _reserved.set_word_size(0); | |
| 160 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 161 size_t actual_heap_size = heap_rs.size() - perm_gen_spec->misc_data_size() | |
| 162 - perm_gen_spec->misc_code_size(); | |
| 163 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); | |
| 164 | |
| 165 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
| 166 set_barrier_set(rem_set()->bs()); | |
| 1166 | 167 |
| 0 | 168 _gch = this; |
| 169 | |
| 170 for (i = 0; i < _n_gens; i++) { | |
| 171 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), | |
| 172 UseSharedSpaces, UseSharedSpaces); | |
| 173 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); | |
| 174 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
| 175 } | |
| 176 _perm_gen = perm_gen_spec->init(heap_rs, PermSize, rem_set()); | |
| 177 | |
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178 clear_incremental_collection_failed(); |
| 0 | 179 |
| 180 #ifndef SERIALGC | |
| 181 // If we are running CMS, create the collector responsible | |
| 182 // for collecting the CMS generations. | |
| 183 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
| 184 bool success = create_cms_collector(); | |
| 185 if (!success) return JNI_ENOMEM; | |
| 186 } | |
| 187 #endif // SERIALGC | |
| 188 | |
| 189 return JNI_OK; | |
| 190 } | |
| 191 | |
| 192 | |
| 193 char* GenCollectedHeap::allocate(size_t alignment, | |
| 194 PermanentGenerationSpec* perm_gen_spec, | |
| 195 size_t* _total_reserved, | |
| 196 int* _n_covered_regions, | |
| 197 ReservedSpace* heap_rs){ | |
| 198 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
| 199 "the maximum representable size"; | |
| 200 | |
| 201 // Now figure out the total size. | |
| 202 size_t total_reserved = 0; | |
| 203 int n_covered_regions = 0; | |
| 204 const size_t pageSize = UseLargePages ? | |
| 205 os::large_page_size() : os::vm_page_size(); | |
| 206 | |
| 207 for (int i = 0; i < _n_gens; i++) { | |
| 208 total_reserved += _gen_specs[i]->max_size(); | |
| 209 if (total_reserved < _gen_specs[i]->max_size()) { | |
| 210 vm_exit_during_initialization(overflow_msg); | |
| 211 } | |
| 212 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
| 213 } | |
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214 assert(total_reserved % pageSize == 0, |
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215 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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216 SIZE_FORMAT, total_reserved, pageSize)); |
| 0 | 217 total_reserved += perm_gen_spec->max_size(); |
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218 assert(total_reserved % pageSize == 0, |
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219 err_msg("Perm size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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220 SIZE_FORMAT ", perm gen max=" SIZE_FORMAT, total_reserved, |
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221 pageSize, perm_gen_spec->max_size())); |
| 0 | 222 |
| 223 if (total_reserved < perm_gen_spec->max_size()) { | |
| 224 vm_exit_during_initialization(overflow_msg); | |
| 225 } | |
| 226 n_covered_regions += perm_gen_spec->n_covered_regions(); | |
| 227 | |
| 228 // Add the size of the data area which shares the same reserved area | |
| 229 // as the heap, but which is not actually part of the heap. | |
| 230 size_t s = perm_gen_spec->misc_data_size() + perm_gen_spec->misc_code_size(); | |
| 231 | |
| 232 total_reserved += s; | |
| 233 if (total_reserved < s) { | |
| 234 vm_exit_during_initialization(overflow_msg); | |
| 235 } | |
| 236 | |
| 237 if (UseLargePages) { | |
| 238 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
| 239 total_reserved = round_to(total_reserved, os::large_page_size()); | |
| 240 if (total_reserved < os::large_page_size()) { | |
| 241 vm_exit_during_initialization(overflow_msg); | |
| 242 } | |
| 243 } | |
| 244 | |
| 245 // Calculate the address at which the heap must reside in order for | |
| 246 // the shared data to be at the required address. | |
| 247 | |
| 248 char* heap_address; | |
| 249 if (UseSharedSpaces) { | |
| 250 | |
| 251 // Calculate the address of the first word beyond the heap. | |
| 252 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 253 int lr = CompactingPermGenGen::n_regions - 1; | |
| 254 size_t capacity = align_size_up(mapinfo->space_capacity(lr), alignment); | |
| 255 heap_address = mapinfo->region_base(lr) + capacity; | |
| 256 | |
| 257 // Calculate the address of the first word of the heap. | |
| 258 heap_address -= total_reserved; | |
| 259 } else { | |
| 260 heap_address = NULL; // any address will do. | |
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261 if (UseCompressedOops) { |
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262 heap_address = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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263 *_total_reserved = total_reserved; |
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264 *_n_covered_regions = n_covered_regions; |
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265 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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266 UseLargePages, heap_address); |
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267 |
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268 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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269 // Failed to reserve at specified address - the requested memory |
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270 // region is taken already, for example, by 'java' launcher. |
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271 // Try again to reserver heap higher. |
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272 heap_address = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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273 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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274 UseLargePages, heap_address); |
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275 |
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276 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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277 // Failed to reserve at specified address again - give up. |
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278 heap_address = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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279 assert(heap_address == NULL, ""); |
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280 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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281 UseLargePages, heap_address); |
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282 } |
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283 } |
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284 return heap_address; |
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285 } |
| 0 | 286 } |
| 287 | |
| 288 *_total_reserved = total_reserved; | |
| 289 *_n_covered_regions = n_covered_regions; | |
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290 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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291 UseLargePages, heap_address); |
| 0 | 292 |
| 293 return heap_address; | |
| 294 } | |
| 295 | |
| 296 | |
| 297 void GenCollectedHeap::post_initialize() { | |
| 298 SharedHeap::post_initialize(); | |
| 299 TwoGenerationCollectorPolicy *policy = | |
| 300 (TwoGenerationCollectorPolicy *)collector_policy(); | |
| 301 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
| 302 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
| 303 assert(def_new_gen->kind() == Generation::DefNew || | |
| 304 def_new_gen->kind() == Generation::ParNew || | |
| 305 def_new_gen->kind() == Generation::ASParNew, | |
| 306 "Wrong generation kind"); | |
| 307 | |
| 308 Generation* old_gen = get_gen(1); | |
| 309 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
| 310 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
| 311 old_gen->kind() == Generation::MarkSweepCompact, | |
| 312 "Wrong generation kind"); | |
| 313 | |
| 314 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
| 315 old_gen->capacity(), | |
| 316 def_new_gen->from()->capacity()); | |
| 317 policy->initialize_gc_policy_counters(); | |
| 318 } | |
| 319 | |
| 320 void GenCollectedHeap::ref_processing_init() { | |
| 321 SharedHeap::ref_processing_init(); | |
| 322 for (int i = 0; i < _n_gens; i++) { | |
| 323 _gens[i]->ref_processor_init(); | |
| 324 } | |
| 325 } | |
| 326 | |
| 327 size_t GenCollectedHeap::capacity() const { | |
| 328 size_t res = 0; | |
| 329 for (int i = 0; i < _n_gens; i++) { | |
| 330 res += _gens[i]->capacity(); | |
| 331 } | |
| 332 return res; | |
| 333 } | |
| 334 | |
| 335 size_t GenCollectedHeap::used() const { | |
| 336 size_t res = 0; | |
| 337 for (int i = 0; i < _n_gens; i++) { | |
| 338 res += _gens[i]->used(); | |
| 339 } | |
| 340 return res; | |
| 341 } | |
| 342 | |
| 343 // Save the "used_region" for generations level and lower, | |
| 344 // and, if perm is true, for perm gen. | |
| 345 void GenCollectedHeap::save_used_regions(int level, bool perm) { | |
| 346 assert(level < _n_gens, "Illegal level parameter"); | |
| 347 for (int i = level; i >= 0; i--) { | |
| 348 _gens[i]->save_used_region(); | |
| 349 } | |
| 350 if (perm) { | |
| 351 perm_gen()->save_used_region(); | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 size_t GenCollectedHeap::max_capacity() const { | |
| 356 size_t res = 0; | |
| 357 for (int i = 0; i < _n_gens; i++) { | |
| 358 res += _gens[i]->max_capacity(); | |
| 359 } | |
| 360 return res; | |
| 361 } | |
| 362 | |
| 363 // Update the _full_collections_completed counter | |
| 364 // at the end of a stop-world full GC. | |
| 365 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
| 366 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 367 assert(_full_collections_completed <= _total_full_collections, | |
| 368 "Can't complete more collections than were started"); | |
| 369 _full_collections_completed = _total_full_collections; | |
| 370 ml.notify_all(); | |
| 371 return _full_collections_completed; | |
| 372 } | |
| 373 | |
| 374 // Update the _full_collections_completed counter, as appropriate, | |
| 375 // at the end of a concurrent GC cycle. Note the conditional update | |
| 376 // below to allow this method to be called by a concurrent collector | |
| 377 // without synchronizing in any manner with the VM thread (which | |
| 378 // may already have initiated a STW full collection "concurrently"). | |
| 379 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
| 380 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 381 assert((_full_collections_completed <= _total_full_collections) && | |
| 382 (count <= _total_full_collections), | |
| 383 "Can't complete more collections than were started"); | |
| 384 if (count > _full_collections_completed) { | |
| 385 _full_collections_completed = count; | |
| 386 ml.notify_all(); | |
| 387 } | |
| 388 return _full_collections_completed; | |
| 389 } | |
| 390 | |
| 391 | |
| 392 #ifndef PRODUCT | |
| 393 // Override of memory state checking method in CollectedHeap: | |
| 394 // Some collectors (CMS for example) can't have badHeapWordVal written | |
| 395 // in the first two words of an object. (For instance , in the case of | |
| 396 // CMS these words hold state used to synchronize between certain | |
| 397 // (concurrent) GC steps and direct allocating mutators.) | |
| 398 // The skip_header_HeapWords() method below, allows us to skip | |
| 399 // over the requisite number of HeapWord's. Note that (for | |
| 400 // generational collectors) this means that those many words are | |
| 401 // skipped in each object, irrespective of the generation in which | |
| 402 // that object lives. The resultant loss of precision seems to be | |
| 403 // harmless and the pain of avoiding that imprecision appears somewhat | |
| 404 // higher than we are prepared to pay for such rudimentary debugging | |
| 405 // support. | |
| 406 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
| 407 size_t size) { | |
| 408 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
| 409 // We are asked to check a size in HeapWords, | |
| 410 // but the memory is mangled in juint words. | |
| 411 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
| 412 juint* end = (juint*) (addr + size); | |
| 413 for (juint* slot = start; slot < end; slot += 1) { | |
| 414 assert(*slot == badHeapWordVal, | |
| 415 "Found non badHeapWordValue in pre-allocation check"); | |
| 416 } | |
| 417 } | |
| 418 } | |
| 419 #endif | |
| 420 | |
| 421 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
| 422 bool is_tlab, | |
| 423 bool first_only) { | |
| 424 HeapWord* res; | |
| 425 for (int i = 0; i < _n_gens; i++) { | |
| 426 if (_gens[i]->should_allocate(size, is_tlab)) { | |
| 427 res = _gens[i]->allocate(size, is_tlab); | |
| 428 if (res != NULL) return res; | |
| 429 else if (first_only) break; | |
| 430 } | |
| 431 } | |
| 432 // Otherwise... | |
| 433 return NULL; | |
| 434 } | |
| 435 | |
| 436 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
| 437 bool* gc_overhead_limit_was_exceeded) { | |
| 438 return collector_policy()->mem_allocate_work(size, | |
|
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439 false /* is_tlab */, |
| 0 | 440 gc_overhead_limit_was_exceeded); |
| 441 } | |
| 442 | |
| 443 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
| 444 return _gc_cause == GCCause::_last_ditch_collection; | |
| 445 } | |
| 446 | |
| 447 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
|
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448 return UseConcMarkSweepGC && |
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449 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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450 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
| 0 | 451 } |
| 452 | |
| 453 void GenCollectedHeap::do_collection(bool full, | |
| 454 bool clear_all_soft_refs, | |
| 455 size_t size, | |
| 456 bool is_tlab, | |
| 457 int max_level) { | |
| 458 bool prepared_for_verification = false; | |
| 459 ResourceMark rm; | |
| 460 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
| 461 | |
| 462 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 463 assert(my_thread->is_VM_thread() || | |
| 464 my_thread->is_ConcurrentGC_thread(), | |
| 465 "incorrect thread type capability"); | |
|
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466 assert(Heap_lock->is_locked(), |
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467 "the requesting thread should have the Heap_lock"); |
| 0 | 468 guarantee(!is_gc_active(), "collection is not reentrant"); |
| 469 assert(max_level < n_gens(), "sanity check"); | |
| 470 | |
| 471 if (GC_locker::check_active_before_gc()) { | |
| 472 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 473 } | |
| 474 | |
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475 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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476 collector_policy()->should_clear_all_soft_refs(); |
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477 |
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478 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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479 |
| 0 | 480 const size_t perm_prev_used = perm_gen()->used(); |
| 481 | |
| 482 if (PrintHeapAtGC) { | |
| 483 Universe::print_heap_before_gc(); | |
| 484 if (Verbose) { | |
| 485 gclog_or_tty->print_cr("GC Cause: %s", GCCause::to_string(gc_cause())); | |
| 486 } | |
| 487 } | |
| 488 | |
| 489 { | |
| 490 FlagSetting fl(_is_gc_active, true); | |
| 491 | |
| 492 bool complete = full && (max_level == (n_gens()-1)); | |
| 493 const char* gc_cause_str = "GC "; | |
| 494 if (complete) { | |
| 495 GCCause::Cause cause = gc_cause(); | |
| 496 if (cause == GCCause::_java_lang_system_gc) { | |
| 497 gc_cause_str = "Full GC (System) "; | |
| 498 } else { | |
| 499 gc_cause_str = "Full GC "; | |
| 500 } | |
| 501 } | |
| 502 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 503 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 504 TraceTime t(gc_cause_str, PrintGCDetails, false, gclog_or_tty); | |
| 505 | |
| 506 gc_prologue(complete); | |
| 507 increment_total_collections(complete); | |
| 508 | |
| 509 size_t gch_prev_used = used(); | |
| 510 | |
| 511 int starting_level = 0; | |
| 512 if (full) { | |
| 513 // Search for the oldest generation which will collect all younger | |
| 514 // generations, and start collection loop there. | |
| 515 for (int i = max_level; i >= 0; i--) { | |
| 516 if (_gens[i]->full_collects_younger_generations()) { | |
| 517 starting_level = i; | |
| 518 break; | |
| 519 } | |
| 520 } | |
| 521 } | |
| 522 | |
| 523 bool must_restore_marks_for_biased_locking = false; | |
| 524 | |
| 525 int max_level_collected = starting_level; | |
| 526 for (int i = starting_level; i <= max_level; i++) { | |
| 527 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
|
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528 if (i == n_gens() - 1) { // a major collection is to happen |
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529 if (!complete) { |
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530 // The full_collections increment was missed above. |
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531 increment_total_full_collections(); |
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532 } |
|
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533 pre_full_gc_dump(); // do any pre full gc dumps |
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534 } |
| 0 | 535 // Timer for individual generations. Last argument is false: no CR |
| 536 TraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, gclog_or_tty); | |
| 537 TraceCollectorStats tcs(_gens[i]->counters()); | |
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538 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
| 0 | 539 |
| 540 size_t prev_used = _gens[i]->used(); | |
| 541 _gens[i]->stat_record()->invocations++; | |
| 542 _gens[i]->stat_record()->accumulated_time.start(); | |
| 543 | |
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544 // Must be done anew before each collection because |
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545 // a previous collection will do mangling and will |
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546 // change top of some spaces. |
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547 record_gen_tops_before_GC(); |
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548 |
| 0 | 549 if (PrintGC && Verbose) { |
| 550 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
| 551 i, | |
| 552 _gens[i]->stat_record()->invocations, | |
| 553 size*HeapWordSize); | |
| 554 } | |
| 555 | |
| 556 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
| 557 total_collections() >= VerifyGCStartAt) { | |
| 558 HandleMark hm; // Discard invalid handles created during verification | |
| 559 if (!prepared_for_verification) { | |
| 560 prepare_for_verify(); | |
| 561 prepared_for_verification = true; | |
| 562 } | |
| 563 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 564 Universe::verify(true); | |
| 565 } | |
| 566 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 567 | |
| 568 if (!must_restore_marks_for_biased_locking && | |
| 569 _gens[i]->performs_in_place_marking()) { | |
| 570 // We perform this mark word preservation work lazily | |
| 571 // because it's only at this point that we know whether we | |
| 572 // absolutely have to do it; we want to avoid doing it for | |
| 573 // scavenge-only collections where it's unnecessary | |
| 574 must_restore_marks_for_biased_locking = true; | |
| 575 BiasedLocking::preserve_marks(); | |
| 576 } | |
| 577 | |
| 578 // Do collection work | |
| 579 { | |
| 580 // Note on ref discovery: For what appear to be historical reasons, | |
| 581 // GCH enables and disabled (by enqueing) refs discovery. | |
| 582 // In the future this should be moved into the generation's | |
| 583 // collect method so that ref discovery and enqueueing concerns | |
| 584 // are local to a generation. The collect method could return | |
| 585 // an appropriate indication in the case that notification on | |
| 586 // the ref lock was needed. This will make the treatment of | |
| 587 // weak refs more uniform (and indeed remove such concerns | |
| 588 // from GCH). XXX | |
| 589 | |
| 590 HandleMark hm; // Discard invalid handles created during gc | |
| 591 save_marks(); // save marks for all gens | |
| 592 // We want to discover references, but not process them yet. | |
| 593 // This mode is disabled in process_discovered_references if the | |
| 594 // generation does some collection work, or in | |
| 595 // enqueue_discovered_references if the generation returns | |
| 596 // without doing any work. | |
| 597 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
| 598 // If the discovery of ("weak") refs in this generation is | |
| 599 // atomic wrt other collectors in this configuration, we | |
| 600 // are guaranteed to have empty discovered ref lists. | |
| 601 if (rp->discovery_is_atomic()) { | |
| 602 rp->verify_no_references_recorded(); | |
| 603 rp->enable_discovery(); | |
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604 rp->setup_policy(do_clear_all_soft_refs); |
| 0 | 605 } else { |
|
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606 // collect() below will enable discovery as appropriate |
| 0 | 607 } |
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608 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
| 0 | 609 if (!rp->enqueuing_is_done()) { |
| 610 rp->enqueue_discovered_references(); | |
| 611 } else { | |
| 612 rp->set_enqueuing_is_done(false); | |
| 613 } | |
| 614 rp->verify_no_references_recorded(); | |
| 615 } | |
| 616 max_level_collected = i; | |
| 617 | |
| 618 // Determine if allocation request was met. | |
| 619 if (size > 0) { | |
| 620 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
| 621 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
| 622 size = 0; | |
| 623 } | |
| 624 } | |
| 625 } | |
| 626 | |
| 627 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 628 | |
| 629 _gens[i]->stat_record()->accumulated_time.stop(); | |
| 630 | |
| 631 update_gc_stats(i, full); | |
| 632 | |
| 633 if (VerifyAfterGC && i >= VerifyGCLevel && | |
| 634 total_collections() >= VerifyGCStartAt) { | |
| 635 HandleMark hm; // Discard invalid handles created during verification | |
| 636 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 637 Universe::verify(false); | |
| 638 } | |
| 639 | |
| 640 if (PrintGCDetails) { | |
| 641 gclog_or_tty->print(":"); | |
| 642 _gens[i]->print_heap_change(prev_used); | |
| 643 } | |
| 644 } | |
| 645 } | |
| 646 | |
| 647 // Update "complete" boolean wrt what actually transpired -- | |
| 648 // for instance, a promotion failure could have led to | |
| 649 // a whole heap collection. | |
| 650 complete = complete || (max_level_collected == n_gens() - 1); | |
| 651 | |
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652 if (complete) { // We did a "major" collection |
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653 post_full_gc_dump(); // do any post full gc dumps |
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654 } |
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655 |
| 0 | 656 if (PrintGCDetails) { |
| 657 print_heap_change(gch_prev_used); | |
| 658 | |
| 659 // Print perm gen info for full GC with PrintGCDetails flag. | |
| 660 if (complete) { | |
| 661 print_perm_heap_change(perm_prev_used); | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 for (int j = max_level_collected; j >= 0; j -= 1) { | |
| 666 // Adjust generation sizes. | |
| 667 _gens[j]->compute_new_size(); | |
| 668 } | |
| 669 | |
| 670 if (complete) { | |
| 671 // Ask the permanent generation to adjust size for full collections | |
| 672 perm()->compute_new_size(); | |
| 673 update_full_collections_completed(); | |
| 674 } | |
| 675 | |
| 676 // Track memory usage and detect low memory after GC finishes | |
| 677 MemoryService::track_memory_usage(); | |
| 678 | |
| 679 gc_epilogue(complete); | |
| 680 | |
| 681 if (must_restore_marks_for_biased_locking) { | |
| 682 BiasedLocking::restore_marks(); | |
| 683 } | |
| 684 } | |
| 685 | |
| 686 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
| 687 AdaptiveSizePolicyOutput(sp, total_collections()); | |
| 688 | |
| 689 if (PrintHeapAtGC) { | |
| 690 Universe::print_heap_after_gc(); | |
| 691 } | |
| 692 | |
|
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693 #ifdef TRACESPINNING |
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694 ParallelTaskTerminator::print_termination_counts(); |
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695 #endif |
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696 |
| 0 | 697 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
| 698 tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
| 699 vm_exit(-1); | |
| 700 } | |
| 701 } | |
| 702 | |
| 703 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
| 704 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
| 705 } | |
| 706 | |
| 707 void GenCollectedHeap::set_par_threads(int t) { | |
| 708 SharedHeap::set_par_threads(t); | |
|
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709 _gen_process_strong_tasks->set_n_threads(t); |
| 0 | 710 } |
| 711 | |
| 712 void GenCollectedHeap:: | |
| 713 gen_process_strong_roots(int level, | |
| 714 bool younger_gens_as_roots, | |
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715 bool activate_scope, |
| 0 | 716 bool collecting_perm_gen, |
| 717 SharedHeap::ScanningOption so, | |
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718 OopsInGenClosure* not_older_gens, |
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719 bool do_code_roots, |
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720 OopsInGenClosure* older_gens) { |
| 0 | 721 // General strong roots. |
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722 |
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723 if (!do_code_roots) { |
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724 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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725 not_older_gens, NULL, older_gens); |
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726 } else { |
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727 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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728 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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729 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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730 not_older_gens, &code_roots, older_gens); |
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731 } |
| 0 | 732 |
| 733 if (younger_gens_as_roots) { | |
| 734 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
| 735 for (int i = 0; i < level; i++) { | |
| 736 not_older_gens->set_generation(_gens[i]); | |
| 737 _gens[i]->oop_iterate(not_older_gens); | |
| 738 } | |
| 739 not_older_gens->reset_generation(); | |
| 740 } | |
| 741 } | |
| 742 // When collection is parallel, all threads get to cooperate to do | |
| 743 // older-gen scanning. | |
| 744 for (int i = level+1; i < _n_gens; i++) { | |
| 745 older_gens->set_generation(_gens[i]); | |
| 746 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
| 747 older_gens->reset_generation(); | |
| 748 } | |
| 749 | |
| 750 _gen_process_strong_tasks->all_tasks_completed(); | |
| 751 } | |
| 752 | |
| 753 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
|
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754 CodeBlobClosure* code_roots, |
| 0 | 755 OopClosure* non_root_closure) { |
|
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756 SharedHeap::process_weak_roots(root_closure, code_roots, non_root_closure); |
| 0 | 757 // "Local" "weak" refs |
| 758 for (int i = 0; i < _n_gens; i++) { | |
| 759 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
| 760 } | |
| 761 } | |
| 762 | |
| 763 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 764 void GenCollectedHeap:: \ | |
| 765 oop_since_save_marks_iterate(int level, \ | |
| 766 OopClosureType* cur, \ | |
| 767 OopClosureType* older) { \ | |
| 768 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
| 769 for (int i = level+1; i < n_gens(); i++) { \ | |
| 770 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 771 } \ | |
| 772 perm_gen()->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 773 } | |
| 774 | |
| 775 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 776 | |
| 777 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 778 | |
| 779 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
| 780 for (int i = level; i < _n_gens; i++) { | |
| 781 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
| 782 } | |
| 783 return perm_gen()->no_allocs_since_save_marks(); | |
| 784 } | |
| 785 | |
| 786 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
| 787 return _gens[0]->supports_inline_contig_alloc(); | |
| 788 } | |
| 789 | |
| 790 HeapWord** GenCollectedHeap::top_addr() const { | |
| 791 return _gens[0]->top_addr(); | |
| 792 } | |
| 793 | |
| 794 HeapWord** GenCollectedHeap::end_addr() const { | |
| 795 return _gens[0]->end_addr(); | |
| 796 } | |
| 797 | |
| 798 size_t GenCollectedHeap::unsafe_max_alloc() { | |
| 799 return _gens[0]->unsafe_max_alloc_nogc(); | |
| 800 } | |
| 801 | |
| 802 // public collection interfaces | |
| 803 | |
| 804 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
| 805 if (should_do_concurrent_full_gc(cause)) { | |
| 806 #ifndef SERIALGC | |
| 807 // mostly concurrent full collection | |
| 808 collect_mostly_concurrent(cause); | |
| 809 #else // SERIALGC | |
| 810 ShouldNotReachHere(); | |
| 811 #endif // SERIALGC | |
| 812 } else { | |
| 813 #ifdef ASSERT | |
| 814 if (cause == GCCause::_scavenge_alot) { | |
| 815 // minor collection only | |
| 816 collect(cause, 0); | |
| 817 } else { | |
| 818 // Stop-the-world full collection | |
| 819 collect(cause, n_gens() - 1); | |
| 820 } | |
| 821 #else | |
| 822 // Stop-the-world full collection | |
| 823 collect(cause, n_gens() - 1); | |
| 824 #endif | |
| 825 } | |
| 826 } | |
| 827 | |
| 828 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
| 829 // The caller doesn't have the Heap_lock | |
| 830 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 831 MutexLocker ml(Heap_lock); | |
| 832 collect_locked(cause, max_level); | |
| 833 } | |
| 834 | |
| 835 // This interface assumes that it's being called by the | |
| 836 // vm thread. It collects the heap assuming that the | |
| 837 // heap lock is already held and that we are executing in | |
| 838 // the context of the vm thread. | |
| 839 void GenCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 840 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 841 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 842 GCCauseSetter gcs(this, cause); | |
| 843 switch (cause) { | |
| 844 case GCCause::_heap_inspection: | |
| 845 case GCCause::_heap_dump: { | |
| 846 HandleMark hm; | |
| 847 do_full_collection(false, // don't clear all soft refs | |
| 848 n_gens() - 1); | |
| 849 break; | |
| 850 } | |
| 851 default: // XXX FIX ME | |
| 852 ShouldNotReachHere(); // Unexpected use of this function | |
| 853 } | |
| 854 } | |
| 855 | |
| 856 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 857 // The caller has the Heap_lock | |
| 858 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
| 859 collect_locked(cause, n_gens() - 1); | |
| 860 } | |
| 861 | |
| 862 // this is the private collection interface | |
| 863 // The Heap_lock is expected to be held on entry. | |
| 864 | |
| 865 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
| 866 if (_preloading_shared_classes) { | |
|
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867 report_out_of_shared_space(SharedPermGen); |
| 0 | 868 } |
| 869 // Read the GC count while holding the Heap_lock | |
| 870 unsigned int gc_count_before = total_collections(); | |
| 871 unsigned int full_gc_count_before = total_full_collections(); | |
| 872 { | |
| 873 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 874 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
| 875 cause, max_level); | |
| 876 VMThread::execute(&op); | |
| 877 } | |
| 878 } | |
| 879 | |
| 880 #ifndef SERIALGC | |
| 881 bool GenCollectedHeap::create_cms_collector() { | |
| 882 | |
| 883 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
| 884 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)) && | |
| 885 _perm_gen->as_gen()->kind() == Generation::ConcurrentMarkSweep, | |
| 886 "Unexpected generation kinds"); | |
| 887 // Skip two header words in the block content verification | |
| 888 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
| 889 CMSCollector* collector = new CMSCollector( | |
| 890 (ConcurrentMarkSweepGeneration*)_gens[1], | |
| 891 (ConcurrentMarkSweepGeneration*)_perm_gen->as_gen(), | |
| 892 _rem_set->as_CardTableRS(), | |
| 893 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
| 894 | |
| 895 if (collector == NULL || !collector->completed_initialization()) { | |
| 896 if (collector) { | |
| 897 delete collector; // Be nice in embedded situation | |
| 898 } | |
| 899 vm_shutdown_during_initialization("Could not create CMS collector"); | |
| 900 return false; | |
| 901 } | |
| 902 return true; // success | |
| 903 } | |
| 904 | |
| 905 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
| 906 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
| 907 | |
| 908 MutexLocker ml(Heap_lock); | |
| 909 // Read the GC counts while holding the Heap_lock | |
| 910 unsigned int full_gc_count_before = total_full_collections(); | |
| 911 unsigned int gc_count_before = total_collections(); | |
| 912 { | |
| 913 MutexUnlocker mu(Heap_lock); | |
| 914 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
| 915 VMThread::execute(&op); | |
| 916 } | |
| 917 } | |
| 918 #endif // SERIALGC | |
| 919 | |
| 920 | |
| 921 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
| 922 int max_level) { | |
| 923 int local_max_level; | |
|
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924 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
| 0 | 925 gc_cause() == GCCause::_gc_locker) { |
| 926 local_max_level = 0; | |
| 927 } else { | |
| 928 local_max_level = max_level; | |
| 929 } | |
| 930 | |
| 931 do_collection(true /* full */, | |
| 932 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 933 0 /* size */, | |
| 934 false /* is_tlab */, | |
| 935 local_max_level /* max_level */); | |
| 936 // Hack XXX FIX ME !!! | |
| 937 // A scavenge may not have been attempted, or may have | |
| 938 // been attempted and failed, because the old gen was too full | |
| 939 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
|
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940 incremental_collection_will_fail(false /* don't consult_young */)) { |
| 0 | 941 if (PrintGCDetails) { |
| 942 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
| 943 "because scavenge failed"); | |
| 944 } | |
| 945 // This time allow the old gen to be collected as well | |
| 946 do_collection(true /* full */, | |
| 947 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 948 0 /* size */, | |
| 949 false /* is_tlab */, | |
| 950 n_gens() - 1 /* max_level */); | |
| 951 } | |
| 952 } | |
| 953 | |
|
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954 bool GenCollectedHeap::is_in_young(oop p) { |
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955 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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956 assert(result == _gens[0]->is_in_reserved(p), |
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957 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, (void*)p)); |
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958 return result; |
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959 } |
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960 |
| 0 | 961 // Returns "TRUE" iff "p" points into the allocated area of the heap. |
| 962 bool GenCollectedHeap::is_in(const void* p) const { | |
| 963 #ifndef ASSERT | |
| 964 guarantee(VerifyBeforeGC || | |
| 965 VerifyDuringGC || | |
| 966 VerifyBeforeExit || | |
|
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967 PrintAssembly || |
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968 tty->count() != 0 || // already printing |
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969 VerifyAfterGC || |
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970 VMError::fatal_error_in_progress(), "too expensive"); |
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971 |
| 0 | 972 #endif |
| 973 // This might be sped up with a cache of the last generation that | |
| 974 // answered yes. | |
| 975 for (int i = 0; i < _n_gens; i++) { | |
| 976 if (_gens[i]->is_in(p)) return true; | |
| 977 } | |
| 978 if (_perm_gen->as_gen()->is_in(p)) return true; | |
| 979 // Otherwise... | |
| 980 return false; | |
| 981 } | |
| 982 | |
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983 #ifdef ASSERT |
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984 // Don't implement this by using is_in_young(). This method is used |
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985 // in some cases to check that is_in_young() is correct. |
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986 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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987 assert(is_in_reserved(p) || p == NULL, |
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988 "Does not work if address is non-null and outside of the heap"); |
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989 // The order of the generations is young (low addr), old, perm (high addr) |
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990 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
| 0 | 991 } |
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992 #endif |
| 0 | 993 |
| 994 void GenCollectedHeap::oop_iterate(OopClosure* cl) { | |
| 995 for (int i = 0; i < _n_gens; i++) { | |
| 996 _gens[i]->oop_iterate(cl); | |
| 997 } | |
| 998 } | |
| 999 | |
| 1000 void GenCollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
| 1001 for (int i = 0; i < _n_gens; i++) { | |
| 1002 _gens[i]->oop_iterate(mr, cl); | |
| 1003 } | |
| 1004 } | |
| 1005 | |
| 1006 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 1007 for (int i = 0; i < _n_gens; i++) { | |
| 1008 _gens[i]->object_iterate(cl); | |
| 1009 } | |
| 1010 perm_gen()->object_iterate(cl); | |
| 1011 } | |
| 1012 | |
|
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1013 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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1014 for (int i = 0; i < _n_gens; i++) { |
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1015 _gens[i]->safe_object_iterate(cl); |
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1016 } |
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1017 perm_gen()->safe_object_iterate(cl); |
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1018 } |
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1019 |
| 0 | 1020 void GenCollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { |
| 1021 for (int i = 0; i < _n_gens; i++) { | |
| 1022 _gens[i]->object_iterate_since_last_GC(cl); | |
| 1023 } | |
| 1024 } | |
| 1025 | |
| 1026 Space* GenCollectedHeap::space_containing(const void* addr) const { | |
| 1027 for (int i = 0; i < _n_gens; i++) { | |
| 1028 Space* res = _gens[i]->space_containing(addr); | |
| 1029 if (res != NULL) return res; | |
| 1030 } | |
| 1031 Space* res = perm_gen()->space_containing(addr); | |
| 1032 if (res != NULL) return res; | |
| 1033 // Otherwise... | |
| 1034 assert(false, "Could not find containing space"); | |
| 1035 return NULL; | |
| 1036 } | |
| 1037 | |
| 1038 | |
| 1039 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
| 1040 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
| 1041 for (int i = 0; i < _n_gens; i++) { | |
| 1042 if (_gens[i]->is_in_reserved(addr)) { | |
| 1043 assert(_gens[i]->is_in(addr), | |
| 1044 "addr should be in allocated part of generation"); | |
| 1045 return _gens[i]->block_start(addr); | |
| 1046 } | |
| 1047 } | |
| 1048 if (perm_gen()->is_in_reserved(addr)) { | |
| 1049 assert(perm_gen()->is_in(addr), | |
| 1050 "addr should be in allocated part of perm gen"); | |
| 1051 return perm_gen()->block_start(addr); | |
| 1052 } | |
| 1053 assert(false, "Some generation should contain the address"); | |
| 1054 return NULL; | |
| 1055 } | |
| 1056 | |
| 1057 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
| 1058 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
| 1059 for (int i = 0; i < _n_gens; i++) { | |
| 1060 if (_gens[i]->is_in_reserved(addr)) { | |
| 1061 assert(_gens[i]->is_in(addr), | |
| 1062 "addr should be in allocated part of generation"); | |
| 1063 return _gens[i]->block_size(addr); | |
| 1064 } | |
| 1065 } | |
| 1066 if (perm_gen()->is_in_reserved(addr)) { | |
| 1067 assert(perm_gen()->is_in(addr), | |
| 1068 "addr should be in allocated part of perm gen"); | |
| 1069 return perm_gen()->block_size(addr); | |
| 1070 } | |
| 1071 assert(false, "Some generation should contain the address"); | |
| 1072 return 0; | |
| 1073 } | |
| 1074 | |
| 1075 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 1076 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
| 1077 assert(block_start(addr) == addr, "addr must be a block start"); | |
| 1078 for (int i = 0; i < _n_gens; i++) { | |
| 1079 if (_gens[i]->is_in_reserved(addr)) { | |
| 1080 return _gens[i]->block_is_obj(addr); | |
| 1081 } | |
| 1082 } | |
| 1083 if (perm_gen()->is_in_reserved(addr)) { | |
| 1084 return perm_gen()->block_is_obj(addr); | |
| 1085 } | |
| 1086 assert(false, "Some generation should contain the address"); | |
| 1087 return false; | |
| 1088 } | |
| 1089 | |
| 1090 bool GenCollectedHeap::supports_tlab_allocation() const { | |
| 1091 for (int i = 0; i < _n_gens; i += 1) { | |
| 1092 if (_gens[i]->supports_tlab_allocation()) { | |
| 1093 return true; | |
| 1094 } | |
| 1095 } | |
| 1096 return false; | |
| 1097 } | |
| 1098 | |
| 1099 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
| 1100 size_t result = 0; | |
| 1101 for (int i = 0; i < _n_gens; i += 1) { | |
| 1102 if (_gens[i]->supports_tlab_allocation()) { | |
| 1103 result += _gens[i]->tlab_capacity(); | |
| 1104 } | |
| 1105 } | |
| 1106 return result; | |
| 1107 } | |
| 1108 | |
| 1109 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 1110 size_t result = 0; | |
| 1111 for (int i = 0; i < _n_gens; i += 1) { | |
| 1112 if (_gens[i]->supports_tlab_allocation()) { | |
| 1113 result += _gens[i]->unsafe_max_tlab_alloc(); | |
| 1114 } | |
| 1115 } | |
| 1116 return result; | |
| 1117 } | |
| 1118 | |
| 1119 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
| 1120 bool gc_overhead_limit_was_exceeded; | |
|
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1121 return collector_policy()->mem_allocate_work(size /* size */, |
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1122 true /* is_tlab */, |
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1123 &gc_overhead_limit_was_exceeded); |
| 0 | 1124 } |
| 1125 | |
| 1126 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
| 1127 // from the list headed by "*prev_ptr". | |
| 1128 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
| 1129 bool first = true; | |
| 1130 size_t min_size = 0; // "first" makes this conceptually infinite. | |
| 1131 ScratchBlock **smallest_ptr, *smallest; | |
| 1132 ScratchBlock *cur = *prev_ptr; | |
| 1133 while (cur) { | |
| 1134 assert(*prev_ptr == cur, "just checking"); | |
| 1135 if (first || cur->num_words < min_size) { | |
| 1136 smallest_ptr = prev_ptr; | |
| 1137 smallest = cur; | |
| 1138 min_size = smallest->num_words; | |
| 1139 first = false; | |
| 1140 } | |
| 1141 prev_ptr = &cur->next; | |
| 1142 cur = cur->next; | |
| 1143 } | |
| 1144 smallest = *smallest_ptr; | |
| 1145 *smallest_ptr = smallest->next; | |
| 1146 return smallest; | |
| 1147 } | |
| 1148 | |
| 1149 // Sort the scratch block list headed by res into decreasing size order, | |
| 1150 // and set "res" to the result. | |
| 1151 static void sort_scratch_list(ScratchBlock*& list) { | |
| 1152 ScratchBlock* sorted = NULL; | |
| 1153 ScratchBlock* unsorted = list; | |
| 1154 while (unsorted) { | |
| 1155 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
| 1156 smallest->next = sorted; | |
| 1157 sorted = smallest; | |
| 1158 } | |
| 1159 list = sorted; | |
| 1160 } | |
| 1161 | |
| 1162 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
| 1163 size_t max_alloc_words) { | |
| 1164 ScratchBlock* res = NULL; | |
| 1165 for (int i = 0; i < _n_gens; i++) { | |
| 1166 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
| 1167 } | |
| 1168 sort_scratch_list(res); | |
| 1169 return res; | |
| 1170 } | |
| 1171 | |
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1172 void GenCollectedHeap::release_scratch() { |
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1173 for (int i = 0; i < _n_gens; i++) { |
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1174 _gens[i]->reset_scratch(); |
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1175 } |
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1176 } |
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1177 |
| 0 | 1178 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
| 1179 void do_generation(Generation* gen) { | |
| 1180 gen->prepare_for_verify(); | |
| 1181 } | |
| 1182 }; | |
| 1183 | |
| 1184 void GenCollectedHeap::prepare_for_verify() { | |
| 1185 ensure_parsability(false); // no need to retire TLABs | |
| 1186 GenPrepareForVerifyClosure blk; | |
| 1187 generation_iterate(&blk, false); | |
| 1188 perm_gen()->prepare_for_verify(); | |
| 1189 } | |
| 1190 | |
| 1191 | |
| 1192 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
| 1193 bool old_to_young) { | |
| 1194 if (old_to_young) { | |
| 1195 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1196 cl->do_generation(_gens[i]); | |
| 1197 } | |
| 1198 } else { | |
| 1199 for (int i = 0; i < _n_gens; i++) { | |
| 1200 cl->do_generation(_gens[i]); | |
| 1201 } | |
| 1202 } | |
| 1203 } | |
| 1204 | |
| 1205 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1206 for (int i = 0; i < _n_gens; i++) { | |
| 1207 _gens[i]->space_iterate(cl, true); | |
| 1208 } | |
| 1209 perm_gen()->space_iterate(cl, true); | |
| 1210 } | |
| 1211 | |
| 1212 bool GenCollectedHeap::is_maximal_no_gc() const { | |
| 1213 for (int i = 0; i < _n_gens; i++) { // skip perm gen | |
| 1214 if (!_gens[i]->is_maximal_no_gc()) { | |
| 1215 return false; | |
| 1216 } | |
| 1217 } | |
| 1218 return true; | |
| 1219 } | |
| 1220 | |
| 1221 void GenCollectedHeap::save_marks() { | |
| 1222 for (int i = 0; i < _n_gens; i++) { | |
| 1223 _gens[i]->save_marks(); | |
| 1224 } | |
| 1225 perm_gen()->save_marks(); | |
| 1226 } | |
| 1227 | |
| 1228 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
| 1229 for (int i = 0; i <= collectedGen; i++) { | |
| 1230 _gens[i]->compute_new_size(); | |
| 1231 } | |
| 1232 } | |
| 1233 | |
| 1234 GenCollectedHeap* GenCollectedHeap::heap() { | |
| 1235 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
| 1236 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
| 1237 return _gch; | |
| 1238 } | |
| 1239 | |
| 1240 | |
| 1241 void GenCollectedHeap::prepare_for_compaction() { | |
| 1242 Generation* scanning_gen = _gens[_n_gens-1]; | |
| 1243 // Start by compacting into same gen. | |
| 1244 CompactPoint cp(scanning_gen, NULL, NULL); | |
| 1245 while (scanning_gen != NULL) { | |
| 1246 scanning_gen->prepare_for_compaction(&cp); | |
| 1247 scanning_gen = prev_gen(scanning_gen); | |
| 1248 } | |
| 1249 } | |
| 1250 | |
| 1251 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
| 1252 return _gens[level]->gc_stats(); | |
| 1253 } | |
| 1254 | |
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1255 void GenCollectedHeap::verify(bool allow_dirty, bool silent, VerifyOption option /* ignored */) { |
| 0 | 1256 if (!silent) { |
| 1257 gclog_or_tty->print("permgen "); | |
| 1258 } | |
| 1259 perm_gen()->verify(allow_dirty); | |
| 1260 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1261 Generation* g = _gens[i]; | |
| 1262 if (!silent) { | |
| 1263 gclog_or_tty->print(g->name()); | |
| 1264 gclog_or_tty->print(" "); | |
| 1265 } | |
| 1266 g->verify(allow_dirty); | |
| 1267 } | |
| 1268 if (!silent) { | |
| 1269 gclog_or_tty->print("remset "); | |
| 1270 } | |
| 1271 rem_set()->verify(); | |
| 1272 } | |
| 1273 | |
| 1274 void GenCollectedHeap::print() const { print_on(tty); } | |
| 1275 void GenCollectedHeap::print_on(outputStream* st) const { | |
| 1276 for (int i = 0; i < _n_gens; i++) { | |
| 1277 _gens[i]->print_on(st); | |
| 1278 } | |
| 1279 perm_gen()->print_on(st); | |
| 1280 } | |
| 1281 | |
| 1282 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 1283 if (workers() != NULL) { | |
| 1284 workers()->threads_do(tc); | |
| 1285 } | |
| 1286 #ifndef SERIALGC | |
| 1287 if (UseConcMarkSweepGC) { | |
| 1288 ConcurrentMarkSweepThread::threads_do(tc); | |
| 1289 } | |
| 1290 #endif // SERIALGC | |
| 1291 } | |
| 1292 | |
| 1293 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
| 1294 #ifndef SERIALGC | |
| 1295 if (UseParNewGC) { | |
| 1296 workers()->print_worker_threads_on(st); | |
| 1297 } | |
| 1298 if (UseConcMarkSweepGC) { | |
| 1299 ConcurrentMarkSweepThread::print_all_on(st); | |
| 1300 } | |
| 1301 #endif // SERIALGC | |
| 1302 } | |
| 1303 | |
| 1304 void GenCollectedHeap::print_tracing_info() const { | |
| 1305 if (TraceGen0Time) { | |
| 1306 get_gen(0)->print_summary_info(); | |
| 1307 } | |
| 1308 if (TraceGen1Time) { | |
| 1309 get_gen(1)->print_summary_info(); | |
| 1310 } | |
| 1311 } | |
| 1312 | |
| 1313 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
| 1314 if (PrintGCDetails && Verbose) { | |
| 1315 gclog_or_tty->print(" " SIZE_FORMAT | |
| 1316 "->" SIZE_FORMAT | |
| 1317 "(" SIZE_FORMAT ")", | |
| 1318 prev_used, used(), capacity()); | |
| 1319 } else { | |
| 1320 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 1321 "->" SIZE_FORMAT "K" | |
| 1322 "(" SIZE_FORMAT "K)", | |
| 1323 prev_used / K, used() / K, capacity() / K); | |
| 1324 } | |
| 1325 } | |
| 1326 | |
| 1327 //New method to print perm gen info with PrintGCDetails flag | |
| 1328 void GenCollectedHeap::print_perm_heap_change(size_t perm_prev_used) const { | |
| 1329 gclog_or_tty->print(", [%s :", perm_gen()->short_name()); | |
| 1330 perm_gen()->print_heap_change(perm_prev_used); | |
| 1331 gclog_or_tty->print("]"); | |
| 1332 } | |
| 1333 | |
| 1334 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
| 1335 private: | |
| 1336 bool _full; | |
| 1337 public: | |
| 1338 void do_generation(Generation* gen) { | |
| 1339 gen->gc_prologue(_full); | |
| 1340 } | |
| 1341 GenGCPrologueClosure(bool full) : _full(full) {}; | |
| 1342 }; | |
| 1343 | |
| 1344 void GenCollectedHeap::gc_prologue(bool full) { | |
| 1345 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 1346 | |
| 1347 always_do_update_barrier = false; | |
| 1348 // Fill TLAB's and such | |
| 1349 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 1350 ensure_parsability(true); // retire TLABs | |
| 1351 | |
| 1352 // Call allocation profiler | |
| 1353 AllocationProfiler::iterate_since_last_gc(); | |
| 1354 // Walk generations | |
| 1355 GenGCPrologueClosure blk(full); | |
| 1356 generation_iterate(&blk, false); // not old-to-young. | |
| 1357 perm_gen()->gc_prologue(full); | |
| 1358 }; | |
| 1359 | |
| 1360 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
| 1361 private: | |
| 1362 bool _full; | |
| 1363 public: | |
| 1364 void do_generation(Generation* gen) { | |
| 1365 gen->gc_epilogue(_full); | |
| 1366 } | |
| 1367 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
| 1368 }; | |
| 1369 | |
| 1370 void GenCollectedHeap::gc_epilogue(bool full) { | |
| 1371 #ifdef COMPILER2 | |
| 1372 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
| 1373 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
| 1374 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
| 1375 #endif /* COMPILER2 */ | |
| 1376 | |
| 1377 resize_all_tlabs(); | |
| 1378 | |
| 1379 GenGCEpilogueClosure blk(full); | |
| 1380 generation_iterate(&blk, false); // not old-to-young. | |
| 1381 perm_gen()->gc_epilogue(full); | |
| 1382 | |
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1383 if (!CleanChunkPoolAsync) { |
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1384 Chunk::clean_chunk_pool(); |
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1385 } |
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1386 |
| 0 | 1387 always_do_update_barrier = UseConcMarkSweepGC; |
| 1388 }; | |
| 1389 | |
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1390 #ifndef PRODUCT |
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1391 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1392 private: |
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1393 public: |
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1394 void do_generation(Generation* gen) { |
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1395 gen->record_spaces_top(); |
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1396 } |
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1397 }; |
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1398 |
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1399 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1400 if (ZapUnusedHeapArea) { |
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1401 GenGCSaveTopsBeforeGCClosure blk; |
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1402 generation_iterate(&blk, false); // not old-to-young. |
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1403 perm_gen()->record_spaces_top(); |
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1404 } |
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1405 } |
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1406 #endif // not PRODUCT |
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1407 |
| 0 | 1408 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
| 1409 public: | |
| 1410 void do_generation(Generation* gen) { | |
| 1411 gen->ensure_parsability(); | |
| 1412 } | |
| 1413 }; | |
| 1414 | |
| 1415 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
| 1416 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 1417 GenEnsureParsabilityClosure ep_cl; | |
| 1418 generation_iterate(&ep_cl, false); | |
| 1419 perm_gen()->ensure_parsability(); | |
| 1420 } | |
| 1421 | |
| 1422 oop GenCollectedHeap::handle_failed_promotion(Generation* gen, | |
| 1423 oop obj, | |
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1424 size_t obj_size) { |
| 0 | 1425 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 1426 HeapWord* result = NULL; | |
| 1427 | |
| 1428 // First give each higher generation a chance to allocate the promoted object. | |
| 1429 Generation* allocator = next_gen(gen); | |
| 1430 if (allocator != NULL) { | |
| 1431 do { | |
| 1432 result = allocator->allocate(obj_size, false); | |
| 1433 } while (result == NULL && (allocator = next_gen(allocator)) != NULL); | |
| 1434 } | |
| 1435 | |
| 1436 if (result == NULL) { | |
| 1437 // Then give gen and higher generations a chance to expand and allocate the | |
| 1438 // object. | |
| 1439 do { | |
| 1440 result = gen->expand_and_allocate(obj_size, false); | |
| 1441 } while (result == NULL && (gen = next_gen(gen)) != NULL); | |
| 1442 } | |
| 1443 | |
| 1444 if (result != NULL) { | |
| 1445 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 1446 } | |
| 1447 return oop(result); | |
| 1448 } | |
| 1449 | |
| 1450 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
| 1451 jlong _time; // in ms | |
| 1452 jlong _now; // in ms | |
| 1453 | |
| 1454 public: | |
| 1455 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
| 1456 | |
| 1457 jlong time() { return _time; } | |
| 1458 | |
| 1459 void do_generation(Generation* gen) { | |
| 1460 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
| 1461 } | |
| 1462 }; | |
| 1463 | |
| 1464 jlong GenCollectedHeap::millis_since_last_gc() { | |
| 1465 jlong now = os::javaTimeMillis(); | |
| 1466 GenTimeOfLastGCClosure tolgc_cl(now); | |
| 1467 // iterate over generations getting the oldest | |
| 1468 // time that a generation was collected | |
| 1469 generation_iterate(&tolgc_cl, false); | |
| 1470 tolgc_cl.do_generation(perm_gen()); | |
| 1471 // XXX Despite the assert above, since javaTimeMillis() | |
| 1472 // doesnot guarantee monotonically increasing return | |
| 1473 // values (note, i didn't say "strictly monotonic"), | |
| 1474 // we need to guard against getting back a time | |
| 1475 // later than now. This should be fixed by basing | |
| 1476 // on someting like gethrtime() which guarantees | |
| 1477 // monotonicity. Note that cond_wait() is susceptible | |
| 1478 // to a similar problem, because its interface is | |
| 1479 // based on absolute time in the form of the | |
| 1480 // system time's notion of UCT. See also 4506635 | |
| 1481 // for yet another problem of similar nature. XXX | |
| 1482 jlong retVal = now - tolgc_cl.time(); | |
| 1483 if (retVal < 0) { | |
| 1484 NOT_PRODUCT(warning("time warp: %d", retVal);) | |
| 1485 return 0; | |
| 1486 } | |
| 1487 return retVal; | |
| 1488 } |