Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 1387:0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes
| author | jmasa |
|---|---|
| date | Tue, 13 Apr 2010 13:52:10 -0700 |
| parents | c4d722788ed6 |
| children | bb843ebc7c55 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
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2 * Copyright 2000-2010 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_genCollectedHeap.cpp.incl" | |
| 27 | |
| 28 GenCollectedHeap* GenCollectedHeap::_gch; | |
| 29 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
| 30 | |
| 31 // The set of potentially parallel tasks in strong root scanning. | |
| 32 enum GCH_process_strong_roots_tasks { | |
| 33 // We probably want to parallelize both of these internally, but for now... | |
| 34 GCH_PS_younger_gens, | |
| 35 // Leave this one last. | |
| 36 GCH_PS_NumElements | |
| 37 }; | |
| 38 | |
| 39 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
| 40 SharedHeap(policy), | |
| 41 _gen_policy(policy), | |
| 42 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
| 43 _full_collections_completed(0) | |
| 44 { | |
| 45 if (_gen_process_strong_tasks == NULL || | |
| 46 !_gen_process_strong_tasks->valid()) { | |
| 47 vm_exit_during_initialization("Failed necessary allocation."); | |
| 48 } | |
| 49 assert(policy != NULL, "Sanity check"); | |
| 50 _preloading_shared_classes = false; | |
| 51 } | |
| 52 | |
| 53 jint GenCollectedHeap::initialize() { | |
| 1166 | 54 CollectedHeap::pre_initialize(); |
| 55 | |
| 0 | 56 int i; |
| 57 _n_gens = gen_policy()->number_of_generations(); | |
| 58 | |
| 59 // While there are no constraints in the GC code that HeapWordSize | |
| 60 // be any particular value, there are multiple other areas in the | |
| 61 // system which believe this to be true (e.g. oop->object_size in some | |
| 62 // cases incorrectly returns the size in wordSize units rather than | |
| 63 // HeapWordSize). | |
| 64 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 65 | |
| 66 // The heap must be at least as aligned as generations. | |
| 67 size_t alignment = Generation::GenGrain; | |
| 68 | |
| 69 _gen_specs = gen_policy()->generations(); | |
| 70 PermanentGenerationSpec *perm_gen_spec = | |
| 71 collector_policy()->permanent_generation(); | |
| 72 | |
| 73 // Make sure the sizes are all aligned. | |
| 74 for (i = 0; i < _n_gens; i++) { | |
| 75 _gen_specs[i]->align(alignment); | |
| 76 } | |
| 77 perm_gen_spec->align(alignment); | |
| 78 | |
| 79 // If we are dumping the heap, then allocate a wasted block of address | |
| 80 // space in order to push the heap to a lower address. This extra | |
| 81 // address range allows for other (or larger) libraries to be loaded | |
| 82 // without them occupying the space required for the shared spaces. | |
| 83 | |
| 84 if (DumpSharedSpaces) { | |
| 85 uintx reserved = 0; | |
| 86 uintx block_size = 64*1024*1024; | |
| 87 while (reserved < SharedDummyBlockSize) { | |
| 88 char* dummy = os::reserve_memory(block_size); | |
| 89 reserved += block_size; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 // Allocate space for the heap. | |
| 94 | |
| 95 char* heap_address; | |
| 96 size_t total_reserved = 0; | |
| 97 int n_covered_regions = 0; | |
| 98 ReservedSpace heap_rs(0); | |
| 99 | |
| 100 heap_address = allocate(alignment, perm_gen_spec, &total_reserved, | |
| 101 &n_covered_regions, &heap_rs); | |
| 102 | |
| 103 if (UseSharedSpaces) { | |
| 104 if (!heap_rs.is_reserved() || heap_address != heap_rs.base()) { | |
| 105 if (heap_rs.is_reserved()) { | |
| 106 heap_rs.release(); | |
| 107 } | |
| 108 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 109 mapinfo->fail_continue("Unable to reserve shared region."); | |
| 110 allocate(alignment, perm_gen_spec, &total_reserved, &n_covered_regions, | |
| 111 &heap_rs); | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 if (!heap_rs.is_reserved()) { | |
| 116 vm_shutdown_during_initialization( | |
| 117 "Could not reserve enough space for object heap"); | |
| 118 return JNI_ENOMEM; | |
| 119 } | |
| 120 | |
| 121 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 122 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 123 | |
| 124 // It is important to do this in a way such that concurrent readers can't | |
| 125 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
| 126 _reserved.set_word_size(0); | |
| 127 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 128 size_t actual_heap_size = heap_rs.size() - perm_gen_spec->misc_data_size() | |
| 129 - perm_gen_spec->misc_code_size(); | |
| 130 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); | |
| 131 | |
| 132 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
| 133 set_barrier_set(rem_set()->bs()); | |
| 1166 | 134 |
| 0 | 135 _gch = this; |
| 136 | |
| 137 for (i = 0; i < _n_gens; i++) { | |
| 138 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), | |
| 139 UseSharedSpaces, UseSharedSpaces); | |
| 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 } | |
| 143 _perm_gen = perm_gen_spec->init(heap_rs, PermSize, rem_set()); | |
| 144 | |
| 145 clear_incremental_collection_will_fail(); | |
| 146 clear_last_incremental_collection_failed(); | |
| 147 | |
| 148 #ifndef SERIALGC | |
| 149 // If we are running CMS, create the collector responsible | |
| 150 // for collecting the CMS generations. | |
| 151 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
| 152 bool success = create_cms_collector(); | |
| 153 if (!success) return JNI_ENOMEM; | |
| 154 } | |
| 155 #endif // SERIALGC | |
| 156 | |
| 157 return JNI_OK; | |
| 158 } | |
| 159 | |
| 160 | |
| 161 char* GenCollectedHeap::allocate(size_t alignment, | |
| 162 PermanentGenerationSpec* perm_gen_spec, | |
| 163 size_t* _total_reserved, | |
| 164 int* _n_covered_regions, | |
| 165 ReservedSpace* heap_rs){ | |
| 166 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
| 167 "the maximum representable size"; | |
| 168 | |
| 169 // Now figure out the total size. | |
| 170 size_t total_reserved = 0; | |
| 171 int n_covered_regions = 0; | |
| 172 const size_t pageSize = UseLargePages ? | |
| 173 os::large_page_size() : os::vm_page_size(); | |
| 174 | |
| 175 for (int i = 0; i < _n_gens; i++) { | |
| 176 total_reserved += _gen_specs[i]->max_size(); | |
| 177 if (total_reserved < _gen_specs[i]->max_size()) { | |
| 178 vm_exit_during_initialization(overflow_msg); | |
| 179 } | |
| 180 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
| 181 } | |
| 182 assert(total_reserved % pageSize == 0, "Gen size"); | |
| 183 total_reserved += perm_gen_spec->max_size(); | |
| 184 assert(total_reserved % pageSize == 0, "Perm Gen size"); | |
| 185 | |
| 186 if (total_reserved < perm_gen_spec->max_size()) { | |
| 187 vm_exit_during_initialization(overflow_msg); | |
| 188 } | |
| 189 n_covered_regions += perm_gen_spec->n_covered_regions(); | |
| 190 | |
| 191 // Add the size of the data area which shares the same reserved area | |
| 192 // as the heap, but which is not actually part of the heap. | |
| 193 size_t s = perm_gen_spec->misc_data_size() + perm_gen_spec->misc_code_size(); | |
| 194 | |
| 195 total_reserved += s; | |
| 196 if (total_reserved < s) { | |
| 197 vm_exit_during_initialization(overflow_msg); | |
| 198 } | |
| 199 | |
| 200 if (UseLargePages) { | |
| 201 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
| 202 total_reserved = round_to(total_reserved, os::large_page_size()); | |
| 203 if (total_reserved < os::large_page_size()) { | |
| 204 vm_exit_during_initialization(overflow_msg); | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 // Calculate the address at which the heap must reside in order for | |
| 209 // the shared data to be at the required address. | |
| 210 | |
| 211 char* heap_address; | |
| 212 if (UseSharedSpaces) { | |
| 213 | |
| 214 // Calculate the address of the first word beyond the heap. | |
| 215 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 216 int lr = CompactingPermGenGen::n_regions - 1; | |
| 217 size_t capacity = align_size_up(mapinfo->space_capacity(lr), alignment); | |
| 218 heap_address = mapinfo->region_base(lr) + capacity; | |
| 219 | |
| 220 // Calculate the address of the first word of the heap. | |
| 221 heap_address -= total_reserved; | |
| 222 } else { | |
| 223 heap_address = NULL; // any address will do. | |
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224 if (UseCompressedOops) { |
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225 heap_address = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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226 *_total_reserved = total_reserved; |
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227 *_n_covered_regions = n_covered_regions; |
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228 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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229 UseLargePages, heap_address); |
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230 |
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231 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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232 // Failed to reserve at specified address - the requested memory |
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233 // region is taken already, for example, by 'java' launcher. |
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234 // Try again to reserver heap higher. |
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235 heap_address = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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236 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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237 UseLargePages, heap_address); |
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238 |
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239 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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240 // Failed to reserve at specified address again - give up. |
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241 heap_address = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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242 assert(heap_address == NULL, ""); |
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243 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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244 UseLargePages, heap_address); |
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245 } |
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246 } |
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247 return heap_address; |
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248 } |
| 0 | 249 } |
| 250 | |
| 251 *_total_reserved = total_reserved; | |
| 252 *_n_covered_regions = n_covered_regions; | |
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253 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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254 UseLargePages, heap_address); |
| 0 | 255 |
| 256 return heap_address; | |
| 257 } | |
| 258 | |
| 259 | |
| 260 void GenCollectedHeap::post_initialize() { | |
| 261 SharedHeap::post_initialize(); | |
| 262 TwoGenerationCollectorPolicy *policy = | |
| 263 (TwoGenerationCollectorPolicy *)collector_policy(); | |
| 264 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
| 265 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
| 266 assert(def_new_gen->kind() == Generation::DefNew || | |
| 267 def_new_gen->kind() == Generation::ParNew || | |
| 268 def_new_gen->kind() == Generation::ASParNew, | |
| 269 "Wrong generation kind"); | |
| 270 | |
| 271 Generation* old_gen = get_gen(1); | |
| 272 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
| 273 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
| 274 old_gen->kind() == Generation::MarkSweepCompact, | |
| 275 "Wrong generation kind"); | |
| 276 | |
| 277 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
| 278 old_gen->capacity(), | |
| 279 def_new_gen->from()->capacity()); | |
| 280 policy->initialize_gc_policy_counters(); | |
| 281 } | |
| 282 | |
| 283 void GenCollectedHeap::ref_processing_init() { | |
| 284 SharedHeap::ref_processing_init(); | |
| 285 for (int i = 0; i < _n_gens; i++) { | |
| 286 _gens[i]->ref_processor_init(); | |
| 287 } | |
| 288 } | |
| 289 | |
| 290 size_t GenCollectedHeap::capacity() const { | |
| 291 size_t res = 0; | |
| 292 for (int i = 0; i < _n_gens; i++) { | |
| 293 res += _gens[i]->capacity(); | |
| 294 } | |
| 295 return res; | |
| 296 } | |
| 297 | |
| 298 size_t GenCollectedHeap::used() const { | |
| 299 size_t res = 0; | |
| 300 for (int i = 0; i < _n_gens; i++) { | |
| 301 res += _gens[i]->used(); | |
| 302 } | |
| 303 return res; | |
| 304 } | |
| 305 | |
| 306 // Save the "used_region" for generations level and lower, | |
| 307 // and, if perm is true, for perm gen. | |
| 308 void GenCollectedHeap::save_used_regions(int level, bool perm) { | |
| 309 assert(level < _n_gens, "Illegal level parameter"); | |
| 310 for (int i = level; i >= 0; i--) { | |
| 311 _gens[i]->save_used_region(); | |
| 312 } | |
| 313 if (perm) { | |
| 314 perm_gen()->save_used_region(); | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 size_t GenCollectedHeap::max_capacity() const { | |
| 319 size_t res = 0; | |
| 320 for (int i = 0; i < _n_gens; i++) { | |
| 321 res += _gens[i]->max_capacity(); | |
| 322 } | |
| 323 return res; | |
| 324 } | |
| 325 | |
| 326 // Update the _full_collections_completed counter | |
| 327 // at the end of a stop-world full GC. | |
| 328 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
| 329 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 330 assert(_full_collections_completed <= _total_full_collections, | |
| 331 "Can't complete more collections than were started"); | |
| 332 _full_collections_completed = _total_full_collections; | |
| 333 ml.notify_all(); | |
| 334 return _full_collections_completed; | |
| 335 } | |
| 336 | |
| 337 // Update the _full_collections_completed counter, as appropriate, | |
| 338 // at the end of a concurrent GC cycle. Note the conditional update | |
| 339 // below to allow this method to be called by a concurrent collector | |
| 340 // without synchronizing in any manner with the VM thread (which | |
| 341 // may already have initiated a STW full collection "concurrently"). | |
| 342 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
| 343 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
| 344 assert((_full_collections_completed <= _total_full_collections) && | |
| 345 (count <= _total_full_collections), | |
| 346 "Can't complete more collections than were started"); | |
| 347 if (count > _full_collections_completed) { | |
| 348 _full_collections_completed = count; | |
| 349 ml.notify_all(); | |
| 350 } | |
| 351 return _full_collections_completed; | |
| 352 } | |
| 353 | |
| 354 | |
| 355 #ifndef PRODUCT | |
| 356 // Override of memory state checking method in CollectedHeap: | |
| 357 // Some collectors (CMS for example) can't have badHeapWordVal written | |
| 358 // in the first two words of an object. (For instance , in the case of | |
| 359 // CMS these words hold state used to synchronize between certain | |
| 360 // (concurrent) GC steps and direct allocating mutators.) | |
| 361 // The skip_header_HeapWords() method below, allows us to skip | |
| 362 // over the requisite number of HeapWord's. Note that (for | |
| 363 // generational collectors) this means that those many words are | |
| 364 // skipped in each object, irrespective of the generation in which | |
| 365 // that object lives. The resultant loss of precision seems to be | |
| 366 // harmless and the pain of avoiding that imprecision appears somewhat | |
| 367 // higher than we are prepared to pay for such rudimentary debugging | |
| 368 // support. | |
| 369 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
| 370 size_t size) { | |
| 371 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
| 372 // We are asked to check a size in HeapWords, | |
| 373 // but the memory is mangled in juint words. | |
| 374 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
| 375 juint* end = (juint*) (addr + size); | |
| 376 for (juint* slot = start; slot < end; slot += 1) { | |
| 377 assert(*slot == badHeapWordVal, | |
| 378 "Found non badHeapWordValue in pre-allocation check"); | |
| 379 } | |
| 380 } | |
| 381 } | |
| 382 #endif | |
| 383 | |
| 384 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
| 385 bool is_tlab, | |
| 386 bool first_only) { | |
| 387 HeapWord* res; | |
| 388 for (int i = 0; i < _n_gens; i++) { | |
| 389 if (_gens[i]->should_allocate(size, is_tlab)) { | |
| 390 res = _gens[i]->allocate(size, is_tlab); | |
| 391 if (res != NULL) return res; | |
| 392 else if (first_only) break; | |
| 393 } | |
| 394 } | |
| 395 // Otherwise... | |
| 396 return NULL; | |
| 397 } | |
| 398 | |
| 399 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
| 400 bool is_large_noref, | |
| 401 bool is_tlab, | |
| 402 bool* gc_overhead_limit_was_exceeded) { | |
| 403 return collector_policy()->mem_allocate_work(size, | |
| 404 is_tlab, | |
| 405 gc_overhead_limit_was_exceeded); | |
| 406 } | |
| 407 | |
| 408 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
| 409 return _gc_cause == GCCause::_last_ditch_collection; | |
| 410 } | |
| 411 | |
| 412 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
| 413 return (cause == GCCause::_java_lang_system_gc || | |
| 414 cause == GCCause::_gc_locker) && | |
| 415 UseConcMarkSweepGC && ExplicitGCInvokesConcurrent; | |
| 416 } | |
| 417 | |
| 418 void GenCollectedHeap::do_collection(bool full, | |
| 419 bool clear_all_soft_refs, | |
| 420 size_t size, | |
| 421 bool is_tlab, | |
| 422 int max_level) { | |
| 423 bool prepared_for_verification = false; | |
| 424 ResourceMark rm; | |
| 425 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
| 426 | |
| 427 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 428 assert(my_thread->is_VM_thread() || | |
| 429 my_thread->is_ConcurrentGC_thread(), | |
| 430 "incorrect thread type capability"); | |
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431 assert(Heap_lock->is_locked(), |
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432 "the requesting thread should have the Heap_lock"); |
| 0 | 433 guarantee(!is_gc_active(), "collection is not reentrant"); |
| 434 assert(max_level < n_gens(), "sanity check"); | |
| 435 | |
| 436 if (GC_locker::check_active_before_gc()) { | |
| 437 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
| 438 } | |
| 439 | |
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440 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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441 collector_policy()->should_clear_all_soft_refs(); |
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442 |
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443 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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444 |
| 0 | 445 const size_t perm_prev_used = perm_gen()->used(); |
| 446 | |
| 447 if (PrintHeapAtGC) { | |
| 448 Universe::print_heap_before_gc(); | |
| 449 if (Verbose) { | |
| 450 gclog_or_tty->print_cr("GC Cause: %s", GCCause::to_string(gc_cause())); | |
| 451 } | |
| 452 } | |
| 453 | |
| 454 { | |
| 455 FlagSetting fl(_is_gc_active, true); | |
| 456 | |
| 457 bool complete = full && (max_level == (n_gens()-1)); | |
| 458 const char* gc_cause_str = "GC "; | |
| 459 if (complete) { | |
| 460 GCCause::Cause cause = gc_cause(); | |
| 461 if (cause == GCCause::_java_lang_system_gc) { | |
| 462 gc_cause_str = "Full GC (System) "; | |
| 463 } else { | |
| 464 gc_cause_str = "Full GC "; | |
| 465 } | |
| 466 } | |
| 467 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
| 468 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
| 469 TraceTime t(gc_cause_str, PrintGCDetails, false, gclog_or_tty); | |
| 470 | |
| 471 gc_prologue(complete); | |
| 472 increment_total_collections(complete); | |
| 473 | |
| 474 size_t gch_prev_used = used(); | |
| 475 | |
| 476 int starting_level = 0; | |
| 477 if (full) { | |
| 478 // Search for the oldest generation which will collect all younger | |
| 479 // generations, and start collection loop there. | |
| 480 for (int i = max_level; i >= 0; i--) { | |
| 481 if (_gens[i]->full_collects_younger_generations()) { | |
| 482 starting_level = i; | |
| 483 break; | |
| 484 } | |
| 485 } | |
| 486 } | |
| 487 | |
| 488 bool must_restore_marks_for_biased_locking = false; | |
| 489 | |
| 490 int max_level_collected = starting_level; | |
| 491 for (int i = starting_level; i <= max_level; i++) { | |
| 492 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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493 if (i == n_gens() - 1) { // a major collection is to happen |
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494 if (!complete) { |
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495 // The full_collections increment was missed above. |
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496 increment_total_full_collections(); |
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497 } |
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498 pre_full_gc_dump(); // do any pre full gc dumps |
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499 } |
| 0 | 500 // Timer for individual generations. Last argument is false: no CR |
| 501 TraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, gclog_or_tty); | |
| 502 TraceCollectorStats tcs(_gens[i]->counters()); | |
| 503 TraceMemoryManagerStats tmms(_gens[i]->kind()); | |
| 504 | |
| 505 size_t prev_used = _gens[i]->used(); | |
| 506 _gens[i]->stat_record()->invocations++; | |
| 507 _gens[i]->stat_record()->accumulated_time.start(); | |
| 508 | |
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509 // Must be done anew before each collection because |
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510 // a previous collection will do mangling and will |
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511 // change top of some spaces. |
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512 record_gen_tops_before_GC(); |
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513 |
| 0 | 514 if (PrintGC && Verbose) { |
| 515 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
| 516 i, | |
| 517 _gens[i]->stat_record()->invocations, | |
| 518 size*HeapWordSize); | |
| 519 } | |
| 520 | |
| 521 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
| 522 total_collections() >= VerifyGCStartAt) { | |
| 523 HandleMark hm; // Discard invalid handles created during verification | |
| 524 if (!prepared_for_verification) { | |
| 525 prepare_for_verify(); | |
| 526 prepared_for_verification = true; | |
| 527 } | |
| 528 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 529 Universe::verify(true); | |
| 530 } | |
| 531 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 532 | |
| 533 if (!must_restore_marks_for_biased_locking && | |
| 534 _gens[i]->performs_in_place_marking()) { | |
| 535 // We perform this mark word preservation work lazily | |
| 536 // because it's only at this point that we know whether we | |
| 537 // absolutely have to do it; we want to avoid doing it for | |
| 538 // scavenge-only collections where it's unnecessary | |
| 539 must_restore_marks_for_biased_locking = true; | |
| 540 BiasedLocking::preserve_marks(); | |
| 541 } | |
| 542 | |
| 543 // Do collection work | |
| 544 { | |
| 545 // Note on ref discovery: For what appear to be historical reasons, | |
| 546 // GCH enables and disabled (by enqueing) refs discovery. | |
| 547 // In the future this should be moved into the generation's | |
| 548 // collect method so that ref discovery and enqueueing concerns | |
| 549 // are local to a generation. The collect method could return | |
| 550 // an appropriate indication in the case that notification on | |
| 551 // the ref lock was needed. This will make the treatment of | |
| 552 // weak refs more uniform (and indeed remove such concerns | |
| 553 // from GCH). XXX | |
| 554 | |
| 555 HandleMark hm; // Discard invalid handles created during gc | |
| 556 save_marks(); // save marks for all gens | |
| 557 // We want to discover references, but not process them yet. | |
| 558 // This mode is disabled in process_discovered_references if the | |
| 559 // generation does some collection work, or in | |
| 560 // enqueue_discovered_references if the generation returns | |
| 561 // without doing any work. | |
| 562 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
| 563 // If the discovery of ("weak") refs in this generation is | |
| 564 // atomic wrt other collectors in this configuration, we | |
| 565 // are guaranteed to have empty discovered ref lists. | |
| 566 if (rp->discovery_is_atomic()) { | |
| 567 rp->verify_no_references_recorded(); | |
| 568 rp->enable_discovery(); | |
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569 rp->setup_policy(do_clear_all_soft_refs); |
| 0 | 570 } else { |
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571 // collect() below will enable discovery as appropriate |
| 0 | 572 } |
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573 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
| 0 | 574 if (!rp->enqueuing_is_done()) { |
| 575 rp->enqueue_discovered_references(); | |
| 576 } else { | |
| 577 rp->set_enqueuing_is_done(false); | |
| 578 } | |
| 579 rp->verify_no_references_recorded(); | |
| 580 } | |
| 581 max_level_collected = i; | |
| 582 | |
| 583 // Determine if allocation request was met. | |
| 584 if (size > 0) { | |
| 585 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
| 586 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
| 587 size = 0; | |
| 588 } | |
| 589 } | |
| 590 } | |
| 591 | |
| 592 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 593 | |
| 594 _gens[i]->stat_record()->accumulated_time.stop(); | |
| 595 | |
| 596 update_gc_stats(i, full); | |
| 597 | |
| 598 if (VerifyAfterGC && i >= VerifyGCLevel && | |
| 599 total_collections() >= VerifyGCStartAt) { | |
| 600 HandleMark hm; // Discard invalid handles created during verification | |
| 601 gclog_or_tty->print(" VerifyAfterGC:"); | |
| 602 Universe::verify(false); | |
| 603 } | |
| 604 | |
| 605 if (PrintGCDetails) { | |
| 606 gclog_or_tty->print(":"); | |
| 607 _gens[i]->print_heap_change(prev_used); | |
| 608 } | |
| 609 } | |
| 610 } | |
| 611 | |
| 612 // Update "complete" boolean wrt what actually transpired -- | |
| 613 // for instance, a promotion failure could have led to | |
| 614 // a whole heap collection. | |
| 615 complete = complete || (max_level_collected == n_gens() - 1); | |
| 616 | |
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617 if (complete) { // We did a "major" collection |
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618 post_full_gc_dump(); // do any post full gc dumps |
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619 } |
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620 |
| 0 | 621 if (PrintGCDetails) { |
| 622 print_heap_change(gch_prev_used); | |
| 623 | |
| 624 // Print perm gen info for full GC with PrintGCDetails flag. | |
| 625 if (complete) { | |
| 626 print_perm_heap_change(perm_prev_used); | |
| 627 } | |
| 628 } | |
| 629 | |
| 630 for (int j = max_level_collected; j >= 0; j -= 1) { | |
| 631 // Adjust generation sizes. | |
| 632 _gens[j]->compute_new_size(); | |
| 633 } | |
| 634 | |
| 635 if (complete) { | |
| 636 // Ask the permanent generation to adjust size for full collections | |
| 637 perm()->compute_new_size(); | |
| 638 update_full_collections_completed(); | |
| 639 } | |
| 640 | |
| 641 // Track memory usage and detect low memory after GC finishes | |
| 642 MemoryService::track_memory_usage(); | |
| 643 | |
| 644 gc_epilogue(complete); | |
| 645 | |
| 646 if (must_restore_marks_for_biased_locking) { | |
| 647 BiasedLocking::restore_marks(); | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
| 652 AdaptiveSizePolicyOutput(sp, total_collections()); | |
| 653 | |
| 654 if (PrintHeapAtGC) { | |
| 655 Universe::print_heap_after_gc(); | |
| 656 } | |
| 657 | |
|
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658 #ifdef TRACESPINNING |
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659 ParallelTaskTerminator::print_termination_counts(); |
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660 #endif |
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661 |
| 0 | 662 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
| 663 tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
| 664 vm_exit(-1); | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
| 669 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
| 670 } | |
| 671 | |
| 672 void GenCollectedHeap::set_par_threads(int t) { | |
| 673 SharedHeap::set_par_threads(t); | |
| 674 _gen_process_strong_tasks->set_par_threads(t); | |
| 675 } | |
| 676 | |
| 677 class AssertIsPermClosure: public OopClosure { | |
| 678 public: | |
| 679 void do_oop(oop* p) { | |
| 680 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); | |
| 681 } | |
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682 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| 0 | 683 }; |
| 684 static AssertIsPermClosure assert_is_perm_closure; | |
| 685 | |
| 686 void GenCollectedHeap:: | |
| 687 gen_process_strong_roots(int level, | |
| 688 bool younger_gens_as_roots, | |
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689 bool activate_scope, |
| 0 | 690 bool collecting_perm_gen, |
| 691 SharedHeap::ScanningOption so, | |
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692 OopsInGenClosure* not_older_gens, |
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693 bool do_code_roots, |
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694 OopsInGenClosure* older_gens) { |
| 0 | 695 // General strong roots. |
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696 |
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697 if (!do_code_roots) { |
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698 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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699 not_older_gens, NULL, older_gens); |
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700 } else { |
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701 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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702 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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703 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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704 not_older_gens, &code_roots, older_gens); |
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705 } |
| 0 | 706 |
| 707 if (younger_gens_as_roots) { | |
| 708 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
| 709 for (int i = 0; i < level; i++) { | |
| 710 not_older_gens->set_generation(_gens[i]); | |
| 711 _gens[i]->oop_iterate(not_older_gens); | |
| 712 } | |
| 713 not_older_gens->reset_generation(); | |
| 714 } | |
| 715 } | |
| 716 // When collection is parallel, all threads get to cooperate to do | |
| 717 // older-gen scanning. | |
| 718 for (int i = level+1; i < _n_gens; i++) { | |
| 719 older_gens->set_generation(_gens[i]); | |
| 720 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
| 721 older_gens->reset_generation(); | |
| 722 } | |
| 723 | |
| 724 _gen_process_strong_tasks->all_tasks_completed(); | |
| 725 } | |
| 726 | |
| 727 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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728 CodeBlobClosure* code_roots, |
| 0 | 729 OopClosure* non_root_closure) { |
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730 SharedHeap::process_weak_roots(root_closure, code_roots, non_root_closure); |
| 0 | 731 // "Local" "weak" refs |
| 732 for (int i = 0; i < _n_gens; i++) { | |
| 733 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
| 734 } | |
| 735 } | |
| 736 | |
| 737 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 738 void GenCollectedHeap:: \ | |
| 739 oop_since_save_marks_iterate(int level, \ | |
| 740 OopClosureType* cur, \ | |
| 741 OopClosureType* older) { \ | |
| 742 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
| 743 for (int i = level+1; i < n_gens(); i++) { \ | |
| 744 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 745 } \ | |
| 746 perm_gen()->oop_since_save_marks_iterate##nv_suffix(older); \ | |
| 747 } | |
| 748 | |
| 749 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 750 | |
| 751 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 752 | |
| 753 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
| 754 for (int i = level; i < _n_gens; i++) { | |
| 755 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
| 756 } | |
| 757 return perm_gen()->no_allocs_since_save_marks(); | |
| 758 } | |
| 759 | |
| 760 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
| 761 return _gens[0]->supports_inline_contig_alloc(); | |
| 762 } | |
| 763 | |
| 764 HeapWord** GenCollectedHeap::top_addr() const { | |
| 765 return _gens[0]->top_addr(); | |
| 766 } | |
| 767 | |
| 768 HeapWord** GenCollectedHeap::end_addr() const { | |
| 769 return _gens[0]->end_addr(); | |
| 770 } | |
| 771 | |
| 772 size_t GenCollectedHeap::unsafe_max_alloc() { | |
| 773 return _gens[0]->unsafe_max_alloc_nogc(); | |
| 774 } | |
| 775 | |
| 776 // public collection interfaces | |
| 777 | |
| 778 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
| 779 if (should_do_concurrent_full_gc(cause)) { | |
| 780 #ifndef SERIALGC | |
| 781 // mostly concurrent full collection | |
| 782 collect_mostly_concurrent(cause); | |
| 783 #else // SERIALGC | |
| 784 ShouldNotReachHere(); | |
| 785 #endif // SERIALGC | |
| 786 } else { | |
| 787 #ifdef ASSERT | |
| 788 if (cause == GCCause::_scavenge_alot) { | |
| 789 // minor collection only | |
| 790 collect(cause, 0); | |
| 791 } else { | |
| 792 // Stop-the-world full collection | |
| 793 collect(cause, n_gens() - 1); | |
| 794 } | |
| 795 #else | |
| 796 // Stop-the-world full collection | |
| 797 collect(cause, n_gens() - 1); | |
| 798 #endif | |
| 799 } | |
| 800 } | |
| 801 | |
| 802 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
| 803 // The caller doesn't have the Heap_lock | |
| 804 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 805 MutexLocker ml(Heap_lock); | |
| 806 collect_locked(cause, max_level); | |
| 807 } | |
| 808 | |
| 809 // This interface assumes that it's being called by the | |
| 810 // vm thread. It collects the heap assuming that the | |
| 811 // heap lock is already held and that we are executing in | |
| 812 // the context of the vm thread. | |
| 813 void GenCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 814 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 815 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 816 GCCauseSetter gcs(this, cause); | |
| 817 switch (cause) { | |
| 818 case GCCause::_heap_inspection: | |
| 819 case GCCause::_heap_dump: { | |
| 820 HandleMark hm; | |
| 821 do_full_collection(false, // don't clear all soft refs | |
| 822 n_gens() - 1); | |
| 823 break; | |
| 824 } | |
| 825 default: // XXX FIX ME | |
| 826 ShouldNotReachHere(); // Unexpected use of this function | |
| 827 } | |
| 828 } | |
| 829 | |
| 830 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
| 831 // The caller has the Heap_lock | |
| 832 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
| 833 collect_locked(cause, n_gens() - 1); | |
| 834 } | |
| 835 | |
| 836 // this is the private collection interface | |
| 837 // The Heap_lock is expected to be held on entry. | |
| 838 | |
| 839 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
| 840 if (_preloading_shared_classes) { | |
| 841 warning("\nThe permanent generation is not large enough to preload " | |
| 842 "requested classes.\nUse -XX:PermSize= to increase the initial " | |
| 843 "size of the permanent generation.\n"); | |
| 844 vm_exit(2); | |
| 845 } | |
| 846 // Read the GC count while holding the Heap_lock | |
| 847 unsigned int gc_count_before = total_collections(); | |
| 848 unsigned int full_gc_count_before = total_full_collections(); | |
| 849 { | |
| 850 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
| 851 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
| 852 cause, max_level); | |
| 853 VMThread::execute(&op); | |
| 854 } | |
| 855 } | |
| 856 | |
| 857 #ifndef SERIALGC | |
| 858 bool GenCollectedHeap::create_cms_collector() { | |
| 859 | |
| 860 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
| 861 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)) && | |
| 862 _perm_gen->as_gen()->kind() == Generation::ConcurrentMarkSweep, | |
| 863 "Unexpected generation kinds"); | |
| 864 // Skip two header words in the block content verification | |
| 865 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
| 866 CMSCollector* collector = new CMSCollector( | |
| 867 (ConcurrentMarkSweepGeneration*)_gens[1], | |
| 868 (ConcurrentMarkSweepGeneration*)_perm_gen->as_gen(), | |
| 869 _rem_set->as_CardTableRS(), | |
| 870 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
| 871 | |
| 872 if (collector == NULL || !collector->completed_initialization()) { | |
| 873 if (collector) { | |
| 874 delete collector; // Be nice in embedded situation | |
| 875 } | |
| 876 vm_shutdown_during_initialization("Could not create CMS collector"); | |
| 877 return false; | |
| 878 } | |
| 879 return true; // success | |
| 880 } | |
| 881 | |
| 882 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
| 883 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
| 884 | |
| 885 MutexLocker ml(Heap_lock); | |
| 886 // Read the GC counts while holding the Heap_lock | |
| 887 unsigned int full_gc_count_before = total_full_collections(); | |
| 888 unsigned int gc_count_before = total_collections(); | |
| 889 { | |
| 890 MutexUnlocker mu(Heap_lock); | |
| 891 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
| 892 VMThread::execute(&op); | |
| 893 } | |
| 894 } | |
| 895 #endif // SERIALGC | |
| 896 | |
| 897 | |
| 898 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
| 899 int max_level) { | |
| 900 int local_max_level; | |
| 901 if (!incremental_collection_will_fail() && | |
| 902 gc_cause() == GCCause::_gc_locker) { | |
| 903 local_max_level = 0; | |
| 904 } else { | |
| 905 local_max_level = max_level; | |
| 906 } | |
| 907 | |
| 908 do_collection(true /* full */, | |
| 909 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 910 0 /* size */, | |
| 911 false /* is_tlab */, | |
| 912 local_max_level /* max_level */); | |
| 913 // Hack XXX FIX ME !!! | |
| 914 // A scavenge may not have been attempted, or may have | |
| 915 // been attempted and failed, because the old gen was too full | |
| 916 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
| 917 incremental_collection_will_fail()) { | |
| 918 if (PrintGCDetails) { | |
| 919 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
| 920 "because scavenge failed"); | |
| 921 } | |
| 922 // This time allow the old gen to be collected as well | |
| 923 do_collection(true /* full */, | |
| 924 clear_all_soft_refs /* clear_all_soft_refs */, | |
| 925 0 /* size */, | |
| 926 false /* is_tlab */, | |
| 927 n_gens() - 1 /* max_level */); | |
| 928 } | |
| 929 } | |
| 930 | |
| 931 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
| 932 bool GenCollectedHeap::is_in(const void* p) const { | |
| 933 #ifndef ASSERT | |
| 934 guarantee(VerifyBeforeGC || | |
| 935 VerifyDuringGC || | |
| 936 VerifyBeforeExit || | |
|
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937 PrintAssembly || |
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938 tty->count() != 0 || // already printing |
| 0 | 939 VerifyAfterGC, "too expensive"); |
| 940 #endif | |
| 941 // This might be sped up with a cache of the last generation that | |
| 942 // answered yes. | |
| 943 for (int i = 0; i < _n_gens; i++) { | |
| 944 if (_gens[i]->is_in(p)) return true; | |
| 945 } | |
| 946 if (_perm_gen->as_gen()->is_in(p)) return true; | |
| 947 // Otherwise... | |
| 948 return false; | |
| 949 } | |
| 950 | |
| 951 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
| 952 bool GenCollectedHeap::is_in_youngest(void* p) { | |
| 953 return _gens[0]->is_in(p); | |
| 954 } | |
| 955 | |
| 956 void GenCollectedHeap::oop_iterate(OopClosure* cl) { | |
| 957 for (int i = 0; i < _n_gens; i++) { | |
| 958 _gens[i]->oop_iterate(cl); | |
| 959 } | |
| 960 } | |
| 961 | |
| 962 void GenCollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
| 963 for (int i = 0; i < _n_gens; i++) { | |
| 964 _gens[i]->oop_iterate(mr, cl); | |
| 965 } | |
| 966 } | |
| 967 | |
| 968 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
| 969 for (int i = 0; i < _n_gens; i++) { | |
| 970 _gens[i]->object_iterate(cl); | |
| 971 } | |
| 972 perm_gen()->object_iterate(cl); | |
| 973 } | |
| 974 | |
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975 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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976 for (int i = 0; i < _n_gens; i++) { |
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977 _gens[i]->safe_object_iterate(cl); |
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978 } |
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979 perm_gen()->safe_object_iterate(cl); |
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980 } |
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981 |
| 0 | 982 void GenCollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { |
| 983 for (int i = 0; i < _n_gens; i++) { | |
| 984 _gens[i]->object_iterate_since_last_GC(cl); | |
| 985 } | |
| 986 } | |
| 987 | |
| 988 Space* GenCollectedHeap::space_containing(const void* addr) const { | |
| 989 for (int i = 0; i < _n_gens; i++) { | |
| 990 Space* res = _gens[i]->space_containing(addr); | |
| 991 if (res != NULL) return res; | |
| 992 } | |
| 993 Space* res = perm_gen()->space_containing(addr); | |
| 994 if (res != NULL) return res; | |
| 995 // Otherwise... | |
| 996 assert(false, "Could not find containing space"); | |
| 997 return NULL; | |
| 998 } | |
| 999 | |
| 1000 | |
| 1001 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
| 1002 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
| 1003 for (int i = 0; i < _n_gens; i++) { | |
| 1004 if (_gens[i]->is_in_reserved(addr)) { | |
| 1005 assert(_gens[i]->is_in(addr), | |
| 1006 "addr should be in allocated part of generation"); | |
| 1007 return _gens[i]->block_start(addr); | |
| 1008 } | |
| 1009 } | |
| 1010 if (perm_gen()->is_in_reserved(addr)) { | |
| 1011 assert(perm_gen()->is_in(addr), | |
| 1012 "addr should be in allocated part of perm gen"); | |
| 1013 return perm_gen()->block_start(addr); | |
| 1014 } | |
| 1015 assert(false, "Some generation should contain the address"); | |
| 1016 return NULL; | |
| 1017 } | |
| 1018 | |
| 1019 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
| 1020 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
| 1021 for (int i = 0; i < _n_gens; i++) { | |
| 1022 if (_gens[i]->is_in_reserved(addr)) { | |
| 1023 assert(_gens[i]->is_in(addr), | |
| 1024 "addr should be in allocated part of generation"); | |
| 1025 return _gens[i]->block_size(addr); | |
| 1026 } | |
| 1027 } | |
| 1028 if (perm_gen()->is_in_reserved(addr)) { | |
| 1029 assert(perm_gen()->is_in(addr), | |
| 1030 "addr should be in allocated part of perm gen"); | |
| 1031 return perm_gen()->block_size(addr); | |
| 1032 } | |
| 1033 assert(false, "Some generation should contain the address"); | |
| 1034 return 0; | |
| 1035 } | |
| 1036 | |
| 1037 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 1038 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
| 1039 assert(block_start(addr) == addr, "addr must be a block start"); | |
| 1040 for (int i = 0; i < _n_gens; i++) { | |
| 1041 if (_gens[i]->is_in_reserved(addr)) { | |
| 1042 return _gens[i]->block_is_obj(addr); | |
| 1043 } | |
| 1044 } | |
| 1045 if (perm_gen()->is_in_reserved(addr)) { | |
| 1046 return perm_gen()->block_is_obj(addr); | |
| 1047 } | |
| 1048 assert(false, "Some generation should contain the address"); | |
| 1049 return false; | |
| 1050 } | |
| 1051 | |
| 1052 bool GenCollectedHeap::supports_tlab_allocation() const { | |
| 1053 for (int i = 0; i < _n_gens; i += 1) { | |
| 1054 if (_gens[i]->supports_tlab_allocation()) { | |
| 1055 return true; | |
| 1056 } | |
| 1057 } | |
| 1058 return false; | |
| 1059 } | |
| 1060 | |
| 1061 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
| 1062 size_t result = 0; | |
| 1063 for (int i = 0; i < _n_gens; i += 1) { | |
| 1064 if (_gens[i]->supports_tlab_allocation()) { | |
| 1065 result += _gens[i]->tlab_capacity(); | |
| 1066 } | |
| 1067 } | |
| 1068 return result; | |
| 1069 } | |
| 1070 | |
| 1071 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 1072 size_t result = 0; | |
| 1073 for (int i = 0; i < _n_gens; i += 1) { | |
| 1074 if (_gens[i]->supports_tlab_allocation()) { | |
| 1075 result += _gens[i]->unsafe_max_tlab_alloc(); | |
| 1076 } | |
| 1077 } | |
| 1078 return result; | |
| 1079 } | |
| 1080 | |
| 1081 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
| 1082 bool gc_overhead_limit_was_exceeded; | |
| 1083 HeapWord* result = mem_allocate(size /* size */, | |
| 1084 false /* is_large_noref */, | |
| 1085 true /* is_tlab */, | |
| 1086 &gc_overhead_limit_was_exceeded); | |
| 1087 return result; | |
| 1088 } | |
| 1089 | |
| 1090 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
| 1091 // from the list headed by "*prev_ptr". | |
| 1092 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
| 1093 bool first = true; | |
| 1094 size_t min_size = 0; // "first" makes this conceptually infinite. | |
| 1095 ScratchBlock **smallest_ptr, *smallest; | |
| 1096 ScratchBlock *cur = *prev_ptr; | |
| 1097 while (cur) { | |
| 1098 assert(*prev_ptr == cur, "just checking"); | |
| 1099 if (first || cur->num_words < min_size) { | |
| 1100 smallest_ptr = prev_ptr; | |
| 1101 smallest = cur; | |
| 1102 min_size = smallest->num_words; | |
| 1103 first = false; | |
| 1104 } | |
| 1105 prev_ptr = &cur->next; | |
| 1106 cur = cur->next; | |
| 1107 } | |
| 1108 smallest = *smallest_ptr; | |
| 1109 *smallest_ptr = smallest->next; | |
| 1110 return smallest; | |
| 1111 } | |
| 1112 | |
| 1113 // Sort the scratch block list headed by res into decreasing size order, | |
| 1114 // and set "res" to the result. | |
| 1115 static void sort_scratch_list(ScratchBlock*& list) { | |
| 1116 ScratchBlock* sorted = NULL; | |
| 1117 ScratchBlock* unsorted = list; | |
| 1118 while (unsorted) { | |
| 1119 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
| 1120 smallest->next = sorted; | |
| 1121 sorted = smallest; | |
| 1122 } | |
| 1123 list = sorted; | |
| 1124 } | |
| 1125 | |
| 1126 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
| 1127 size_t max_alloc_words) { | |
| 1128 ScratchBlock* res = NULL; | |
| 1129 for (int i = 0; i < _n_gens; i++) { | |
| 1130 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
| 1131 } | |
| 1132 sort_scratch_list(res); | |
| 1133 return res; | |
| 1134 } | |
| 1135 | |
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1136 void GenCollectedHeap::release_scratch() { |
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1137 for (int i = 0; i < _n_gens; i++) { |
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1138 _gens[i]->reset_scratch(); |
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1139 } |
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1140 } |
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1141 |
| 0 | 1142 size_t GenCollectedHeap::large_typearray_limit() { |
| 1143 return gen_policy()->large_typearray_limit(); | |
| 1144 } | |
| 1145 | |
| 1146 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { | |
| 1147 void do_generation(Generation* gen) { | |
| 1148 gen->prepare_for_verify(); | |
| 1149 } | |
| 1150 }; | |
| 1151 | |
| 1152 void GenCollectedHeap::prepare_for_verify() { | |
| 1153 ensure_parsability(false); // no need to retire TLABs | |
| 1154 GenPrepareForVerifyClosure blk; | |
| 1155 generation_iterate(&blk, false); | |
| 1156 perm_gen()->prepare_for_verify(); | |
| 1157 } | |
| 1158 | |
| 1159 | |
| 1160 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
| 1161 bool old_to_young) { | |
| 1162 if (old_to_young) { | |
| 1163 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1164 cl->do_generation(_gens[i]); | |
| 1165 } | |
| 1166 } else { | |
| 1167 for (int i = 0; i < _n_gens; i++) { | |
| 1168 cl->do_generation(_gens[i]); | |
| 1169 } | |
| 1170 } | |
| 1171 } | |
| 1172 | |
| 1173 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1174 for (int i = 0; i < _n_gens; i++) { | |
| 1175 _gens[i]->space_iterate(cl, true); | |
| 1176 } | |
| 1177 perm_gen()->space_iterate(cl, true); | |
| 1178 } | |
| 1179 | |
| 1180 bool GenCollectedHeap::is_maximal_no_gc() const { | |
| 1181 for (int i = 0; i < _n_gens; i++) { // skip perm gen | |
| 1182 if (!_gens[i]->is_maximal_no_gc()) { | |
| 1183 return false; | |
| 1184 } | |
| 1185 } | |
| 1186 return true; | |
| 1187 } | |
| 1188 | |
| 1189 void GenCollectedHeap::save_marks() { | |
| 1190 for (int i = 0; i < _n_gens; i++) { | |
| 1191 _gens[i]->save_marks(); | |
| 1192 } | |
| 1193 perm_gen()->save_marks(); | |
| 1194 } | |
| 1195 | |
| 1196 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
| 1197 for (int i = 0; i <= collectedGen; i++) { | |
| 1198 _gens[i]->compute_new_size(); | |
| 1199 } | |
| 1200 } | |
| 1201 | |
| 1202 GenCollectedHeap* GenCollectedHeap::heap() { | |
| 1203 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
| 1204 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
| 1205 return _gch; | |
| 1206 } | |
| 1207 | |
| 1208 | |
| 1209 void GenCollectedHeap::prepare_for_compaction() { | |
| 1210 Generation* scanning_gen = _gens[_n_gens-1]; | |
| 1211 // Start by compacting into same gen. | |
| 1212 CompactPoint cp(scanning_gen, NULL, NULL); | |
| 1213 while (scanning_gen != NULL) { | |
| 1214 scanning_gen->prepare_for_compaction(&cp); | |
| 1215 scanning_gen = prev_gen(scanning_gen); | |
| 1216 } | |
| 1217 } | |
| 1218 | |
| 1219 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
| 1220 return _gens[level]->gc_stats(); | |
| 1221 } | |
| 1222 | |
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1223 void GenCollectedHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) { |
| 0 | 1224 if (!silent) { |
| 1225 gclog_or_tty->print("permgen "); | |
| 1226 } | |
| 1227 perm_gen()->verify(allow_dirty); | |
| 1228 for (int i = _n_gens-1; i >= 0; i--) { | |
| 1229 Generation* g = _gens[i]; | |
| 1230 if (!silent) { | |
| 1231 gclog_or_tty->print(g->name()); | |
| 1232 gclog_or_tty->print(" "); | |
| 1233 } | |
| 1234 g->verify(allow_dirty); | |
| 1235 } | |
| 1236 if (!silent) { | |
| 1237 gclog_or_tty->print("remset "); | |
| 1238 } | |
| 1239 rem_set()->verify(); | |
| 1240 if (!silent) { | |
| 1241 gclog_or_tty->print("ref_proc "); | |
| 1242 } | |
| 1243 ReferenceProcessor::verify(); | |
| 1244 } | |
| 1245 | |
| 1246 void GenCollectedHeap::print() const { print_on(tty); } | |
| 1247 void GenCollectedHeap::print_on(outputStream* st) const { | |
| 1248 for (int i = 0; i < _n_gens; i++) { | |
| 1249 _gens[i]->print_on(st); | |
| 1250 } | |
| 1251 perm_gen()->print_on(st); | |
| 1252 } | |
| 1253 | |
| 1254 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 1255 if (workers() != NULL) { | |
| 1256 workers()->threads_do(tc); | |
| 1257 } | |
| 1258 #ifndef SERIALGC | |
| 1259 if (UseConcMarkSweepGC) { | |
| 1260 ConcurrentMarkSweepThread::threads_do(tc); | |
| 1261 } | |
| 1262 #endif // SERIALGC | |
| 1263 } | |
| 1264 | |
| 1265 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
| 1266 #ifndef SERIALGC | |
| 1267 if (UseParNewGC) { | |
| 1268 workers()->print_worker_threads_on(st); | |
| 1269 } | |
| 1270 if (UseConcMarkSweepGC) { | |
| 1271 ConcurrentMarkSweepThread::print_all_on(st); | |
| 1272 } | |
| 1273 #endif // SERIALGC | |
| 1274 } | |
| 1275 | |
| 1276 void GenCollectedHeap::print_tracing_info() const { | |
| 1277 if (TraceGen0Time) { | |
| 1278 get_gen(0)->print_summary_info(); | |
| 1279 } | |
| 1280 if (TraceGen1Time) { | |
| 1281 get_gen(1)->print_summary_info(); | |
| 1282 } | |
| 1283 } | |
| 1284 | |
| 1285 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
| 1286 if (PrintGCDetails && Verbose) { | |
| 1287 gclog_or_tty->print(" " SIZE_FORMAT | |
| 1288 "->" SIZE_FORMAT | |
| 1289 "(" SIZE_FORMAT ")", | |
| 1290 prev_used, used(), capacity()); | |
| 1291 } else { | |
| 1292 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 1293 "->" SIZE_FORMAT "K" | |
| 1294 "(" SIZE_FORMAT "K)", | |
| 1295 prev_used / K, used() / K, capacity() / K); | |
| 1296 } | |
| 1297 } | |
| 1298 | |
| 1299 //New method to print perm gen info with PrintGCDetails flag | |
| 1300 void GenCollectedHeap::print_perm_heap_change(size_t perm_prev_used) const { | |
| 1301 gclog_or_tty->print(", [%s :", perm_gen()->short_name()); | |
| 1302 perm_gen()->print_heap_change(perm_prev_used); | |
| 1303 gclog_or_tty->print("]"); | |
| 1304 } | |
| 1305 | |
| 1306 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
| 1307 private: | |
| 1308 bool _full; | |
| 1309 public: | |
| 1310 void do_generation(Generation* gen) { | |
| 1311 gen->gc_prologue(_full); | |
| 1312 } | |
| 1313 GenGCPrologueClosure(bool full) : _full(full) {}; | |
| 1314 }; | |
| 1315 | |
| 1316 void GenCollectedHeap::gc_prologue(bool full) { | |
| 1317 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
| 1318 | |
| 1319 always_do_update_barrier = false; | |
| 1320 // Fill TLAB's and such | |
| 1321 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 1322 ensure_parsability(true); // retire TLABs | |
| 1323 | |
| 1324 // Call allocation profiler | |
| 1325 AllocationProfiler::iterate_since_last_gc(); | |
| 1326 // Walk generations | |
| 1327 GenGCPrologueClosure blk(full); | |
| 1328 generation_iterate(&blk, false); // not old-to-young. | |
| 1329 perm_gen()->gc_prologue(full); | |
| 1330 }; | |
| 1331 | |
| 1332 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
| 1333 private: | |
| 1334 bool _full; | |
| 1335 public: | |
| 1336 void do_generation(Generation* gen) { | |
| 1337 gen->gc_epilogue(_full); | |
| 1338 } | |
| 1339 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
| 1340 }; | |
| 1341 | |
| 1342 void GenCollectedHeap::gc_epilogue(bool full) { | |
| 1343 // Remember if a partial collection of the heap failed, and | |
| 1344 // we did a complete collection. | |
| 1345 if (full && incremental_collection_will_fail()) { | |
| 1346 set_last_incremental_collection_failed(); | |
| 1347 } else { | |
| 1348 clear_last_incremental_collection_failed(); | |
| 1349 } | |
| 1350 // Clear the flag, if set; the generation gc_epilogues will set the | |
| 1351 // flag again if the condition persists despite the collection. | |
| 1352 clear_incremental_collection_will_fail(); | |
| 1353 | |
| 1354 #ifdef COMPILER2 | |
| 1355 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
| 1356 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
| 1357 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
| 1358 #endif /* COMPILER2 */ | |
| 1359 | |
| 1360 resize_all_tlabs(); | |
| 1361 | |
| 1362 GenGCEpilogueClosure blk(full); | |
| 1363 generation_iterate(&blk, false); // not old-to-young. | |
| 1364 perm_gen()->gc_epilogue(full); | |
| 1365 | |
| 1366 always_do_update_barrier = UseConcMarkSweepGC; | |
| 1367 }; | |
| 1368 | |
|
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1369 #ifndef PRODUCT |
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1370 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1371 private: |
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1372 public: |
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1373 void do_generation(Generation* gen) { |
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1374 gen->record_spaces_top(); |
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1375 } |
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1376 }; |
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1377 |
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1378 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1379 if (ZapUnusedHeapArea) { |
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1380 GenGCSaveTopsBeforeGCClosure blk; |
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1381 generation_iterate(&blk, false); // not old-to-young. |
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1382 perm_gen()->record_spaces_top(); |
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1383 } |
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1384 } |
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1385 #endif // not PRODUCT |
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1386 |
| 0 | 1387 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
| 1388 public: | |
| 1389 void do_generation(Generation* gen) { | |
| 1390 gen->ensure_parsability(); | |
| 1391 } | |
| 1392 }; | |
| 1393 | |
| 1394 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
| 1395 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 1396 GenEnsureParsabilityClosure ep_cl; | |
| 1397 generation_iterate(&ep_cl, false); | |
| 1398 perm_gen()->ensure_parsability(); | |
| 1399 } | |
| 1400 | |
| 1401 oop GenCollectedHeap::handle_failed_promotion(Generation* gen, | |
| 1402 oop obj, | |
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1403 size_t obj_size) { |
| 0 | 1404 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 1405 HeapWord* result = NULL; | |
| 1406 | |
| 1407 // First give each higher generation a chance to allocate the promoted object. | |
| 1408 Generation* allocator = next_gen(gen); | |
| 1409 if (allocator != NULL) { | |
| 1410 do { | |
| 1411 result = allocator->allocate(obj_size, false); | |
| 1412 } while (result == NULL && (allocator = next_gen(allocator)) != NULL); | |
| 1413 } | |
| 1414 | |
| 1415 if (result == NULL) { | |
| 1416 // Then give gen and higher generations a chance to expand and allocate the | |
| 1417 // object. | |
| 1418 do { | |
| 1419 result = gen->expand_and_allocate(obj_size, false); | |
| 1420 } while (result == NULL && (gen = next_gen(gen)) != NULL); | |
| 1421 } | |
| 1422 | |
| 1423 if (result != NULL) { | |
| 1424 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 1425 } | |
| 1426 return oop(result); | |
| 1427 } | |
| 1428 | |
| 1429 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
| 1430 jlong _time; // in ms | |
| 1431 jlong _now; // in ms | |
| 1432 | |
| 1433 public: | |
| 1434 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
| 1435 | |
| 1436 jlong time() { return _time; } | |
| 1437 | |
| 1438 void do_generation(Generation* gen) { | |
| 1439 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
| 1440 } | |
| 1441 }; | |
| 1442 | |
| 1443 jlong GenCollectedHeap::millis_since_last_gc() { | |
| 1444 jlong now = os::javaTimeMillis(); | |
| 1445 GenTimeOfLastGCClosure tolgc_cl(now); | |
| 1446 // iterate over generations getting the oldest | |
| 1447 // time that a generation was collected | |
| 1448 generation_iterate(&tolgc_cl, false); | |
| 1449 tolgc_cl.do_generation(perm_gen()); | |
| 1450 // XXX Despite the assert above, since javaTimeMillis() | |
| 1451 // doesnot guarantee monotonically increasing return | |
| 1452 // values (note, i didn't say "strictly monotonic"), | |
| 1453 // we need to guard against getting back a time | |
| 1454 // later than now. This should be fixed by basing | |
| 1455 // on someting like gethrtime() which guarantees | |
| 1456 // monotonicity. Note that cond_wait() is susceptible | |
| 1457 // to a similar problem, because its interface is | |
| 1458 // based on absolute time in the form of the | |
| 1459 // system time's notion of UCT. See also 4506635 | |
| 1460 // for yet another problem of similar nature. XXX | |
| 1461 jlong retVal = now - tolgc_cl.time(); | |
| 1462 if (retVal < 0) { | |
| 1463 NOT_PRODUCT(warning("time warp: %d", retVal);) | |
| 1464 return 0; | |
| 1465 } | |
| 1466 return retVal; | |
| 1467 } |