1 /* 2 * Copyright (c) 2013, 2018, Red Hat, Inc. and/or its affiliates. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP 26 27 #include "gc/shared/markBitMap.hpp" 28 #include "gc/shared/collectedHeap.hpp" 29 #include "gc/shenandoah/shenandoahHeapLock.hpp" 30 #include "gc/shenandoah/shenandoahEvacOOMHandler.hpp" 31 #include "gc/shenandoah/shenandoahSharedVariables.hpp" 32 #include "gc/shenandoah/shenandoahWorkGroup.hpp" 33 #include "services/memoryManager.hpp" 34 35 class ConcurrentGCTimer; 36 class PLABStats; 37 class ShenandoahAsserts; 38 class ShenandoahAllocTracker; 39 class ShenandoahCollectorPolicy; 40 class ShenandoahConnectionMatrix; 41 class ShenandoahFastRegionSet; 42 class ShenandoahPhaseTimings; 43 class ShenandoahHeap; 44 class ShenandoahHeapRegion; 45 class ShenandoahHeapRegionClosure; 46 class ShenandoahHeapRegionSet; 47 class ShenandoahCollectionSet; 48 class ShenandoahFreeSet; 49 class ShenandoahConcurrentMark; 50 class ShenandoahMarkCompact; 51 class ShenandoahPacer; 52 class ShenandoahTraversalGC; 53 class ShenandoahVerifier; 54 class ShenandoahControlThread; 55 class ShenandoahMonitoringSupport; 56 57 class ShenandoahRegionIterator : public StackObj { 58 private: 59 volatile size_t _index; 60 ShenandoahHeap* _heap; 61 62 // No implicit copying: iterators should be passed by reference to capture the state, 63 // or be copied explicitly by "=" operator 64 ShenandoahRegionIterator(const ShenandoahRegionIterator& that); 65 66 public: 67 ShenandoahRegionIterator(); 68 ShenandoahRegionIterator(ShenandoahHeap* heap); 69 70 ShenandoahRegionIterator& operator=(const ShenandoahRegionIterator& o); 71 72 // Returns next region, or NULL if there are no more regions. 73 // This is multi-thread-safe. 74 inline ShenandoahHeapRegion* next(); 75 76 // This is *not* MT safe. However, in the absence of multithreaded access, it 77 // can be used to determine if there is more work to do. 78 bool has_next() const; 79 }; 80 81 class ShenandoahHeapRegionClosure : public StackObj { 82 public: 83 // typically called on each region until it returns true; 84 virtual bool heap_region_do(ShenandoahHeapRegion* r) = 0; 85 }; 86 87 class ShenandoahUpdateRefsClosure: public OopClosure { 88 private: 89 ShenandoahHeap* _heap; 90 91 template <class T> 92 inline void do_oop_work(T* p); 93 94 public: 95 ShenandoahUpdateRefsClosure(); 96 inline void do_oop(oop* p); 97 inline void do_oop(narrowOop* p); 98 }; 99 100 #ifdef ASSERT 101 class ShenandoahAssertToSpaceClosure : public OopClosure { 102 private: 103 template <class T> 104 void do_oop_nv(T* p); 105 public: 106 void do_oop(narrowOop* p); 107 void do_oop(oop* p); 108 }; 109 #endif 110 111 class ShenandoahAlwaysTrueClosure : public BoolObjectClosure { 112 public: 113 bool do_object_b(oop p) { return true; } 114 }; 115 116 class ShenandoahForwardedIsAliveClosure: public BoolObjectClosure { 117 private: 118 ShenandoahHeap* _heap; 119 public: 120 ShenandoahForwardedIsAliveClosure(); 121 void init(ShenandoahHeap* heap) { 122 _heap = heap; 123 } 124 bool do_object_b(oop obj); 125 }; 126 127 class ShenandoahIsAliveClosure: public BoolObjectClosure { 128 private: 129 ShenandoahHeap* _heap; 130 public: 131 ShenandoahIsAliveClosure(); 132 void init(ShenandoahHeap* heap) { 133 _heap = heap; 134 } 135 bool do_object_b(oop obj); 136 }; 137 138 class VMStructs; 139 140 // // A "ShenandoahHeap" is an implementation of a java heap for HotSpot. 141 // // It uses a new pauseless GC algorithm based on Brooks pointers. 142 // // Derived from G1 143 144 // // 145 // // CollectedHeap 146 // // SharedHeap 147 // // ShenandoahHeap 148 class ShenandoahHeap : public CollectedHeap { 149 friend class ShenandoahAsserts; 150 friend class VMStructs; 151 152 enum CancelState { 153 154 // Normal state. GC has not been cancelled and is open for cancellation. 155 // Worker threads can suspend for safepoint. 156 CANCELLABLE, 157 158 // GC has been cancelled. Worker threads can not suspend for 159 // safepoint but must finish their work as soon as possible. 160 CANCELLED, 161 162 // GC has not been cancelled and must not be cancelled. At least 163 // one worker thread checks for pending safepoint and may suspend 164 // if a safepoint is pending. 165 NOT_CANCELLED 166 167 }; 168 169 public: 170 // GC state describes the important parts of collector state, that may be 171 // used to make barrier selection decisions in the native and generated code. 172 // Multiple bits can be set at once. 173 // 174 // Important invariant: when GC state is zero, the heap is stable, and no barriers 175 // are required. 176 enum GCStateBitPos { 177 // Heap has forwarded objects: need RB, ACMP, CAS barriers. 178 HAS_FORWARDED_BITPOS = 0, 179 180 // Heap is under marking: needs SATB barriers. 181 MARKING_BITPOS = 1, 182 183 // Heap is under evacuation: needs WB barriers. (Set together with UNSTABLE) 184 EVACUATION_BITPOS = 2, 185 186 // Heap is under updating: needs SVRB/SVWB barriers. 187 UPDATEREFS_BITPOS = 3, 188 189 // Heap is under traversal collection 190 TRAVERSAL_BITPOS = 4, 191 }; 192 193 enum GCState { 194 STABLE = 0, 195 HAS_FORWARDED = 1 << HAS_FORWARDED_BITPOS, 196 MARKING = 1 << MARKING_BITPOS, 197 EVACUATION = 1 << EVACUATION_BITPOS, 198 UPDATEREFS = 1 << UPDATEREFS_BITPOS, 199 TRAVERSAL = 1 << TRAVERSAL_BITPOS, 200 }; 201 202 enum ShenandoahDegenPoint { 203 _degenerated_unset, 204 _degenerated_traversal, 205 _degenerated_outside_cycle, 206 _degenerated_mark, 207 _degenerated_evac, 208 _degenerated_updaterefs, 209 _DEGENERATED_LIMIT, 210 }; 211 212 enum GCCycleMode { 213 NONE, 214 MINOR, 215 MAJOR 216 }; 217 218 static const char* degen_point_to_string(ShenandoahDegenPoint point) { 219 switch (point) { 220 case _degenerated_unset: 221 return "<UNSET>"; 222 case _degenerated_traversal: 223 return "Traversal"; 224 case _degenerated_outside_cycle: 225 return "Outside of Cycle"; 226 case _degenerated_mark: 227 return "Mark"; 228 case _degenerated_evac: 229 return "Evacuation"; 230 case _degenerated_updaterefs: 231 return "Update Refs"; 232 default: 233 ShouldNotReachHere(); 234 return "ERROR"; 235 } 236 }; 237 238 private: 239 ShenandoahSharedBitmap _gc_state; 240 ShenandoahHeapLock _lock; 241 ShenandoahCollectorPolicy* _shenandoah_policy; 242 size_t _bitmap_size; 243 size_t _bitmap_regions_per_slice; 244 size_t _bitmap_bytes_per_slice; 245 MemRegion _heap_region; 246 MemRegion _bitmap0_region; 247 MemRegion _bitmap1_region; 248 MemRegion _aux_bitmap_region; 249 250 ShenandoahHeapRegion** _regions; 251 ShenandoahFreeSet* _free_set; 252 ShenandoahCollectionSet* _collection_set; 253 254 ShenandoahRegionIterator _update_refs_iterator; 255 256 ShenandoahConcurrentMark* _scm; 257 ShenandoahMarkCompact* _full_gc; 258 ShenandoahTraversalGC* _traversal_gc; 259 ShenandoahVerifier* _verifier; 260 ShenandoahPacer* _pacer; 261 262 ShenandoahControlThread* _control_thread; 263 264 ShenandoahMonitoringSupport* _monitoring_support; 265 266 ShenandoahPhaseTimings* _phase_timings; 267 ShenandoahAllocTracker* _alloc_tracker; 268 269 size_t _num_regions; 270 size_t _initial_size; 271 272 uint _max_workers; 273 ShenandoahWorkGang* _workers; 274 ShenandoahWorkGang* _safepoint_workers; 275 276 volatile size_t _used; 277 volatile size_t _committed; 278 279 MarkBitMap _verification_bit_map; 280 MarkBitMap _mark_bit_map0; 281 MarkBitMap _mark_bit_map1; 282 MarkBitMap* _complete_mark_bit_map; 283 MarkBitMap* _next_mark_bit_map; 284 MarkBitMap _aux_bit_map; 285 286 HeapWord** _complete_top_at_mark_starts; 287 HeapWord** _complete_top_at_mark_starts_base; 288 289 HeapWord** _next_top_at_mark_starts; 290 HeapWord** _next_top_at_mark_starts_base; 291 292 volatile size_t _bytes_allocated_since_gc_start; 293 294 ShenandoahSharedFlag _degenerated_gc_in_progress; 295 ShenandoahSharedFlag _full_gc_in_progress; 296 ShenandoahSharedFlag _full_gc_move_in_progress; 297 298 ShenandoahSharedFlag _inject_alloc_failure; 299 300 ShenandoahSharedFlag _process_references; 301 ShenandoahSharedFlag _unload_classes; 302 303 ShenandoahSharedEnumFlag<CancelState> _cancelled_concgc; 304 305 ReferenceProcessor* _ref_processor; 306 307 ShenandoahForwardedIsAliveClosure _forwarded_is_alive; 308 ShenandoahIsAliveClosure _is_alive; 309 310 ConcurrentGCTimer* _gc_timer; 311 312 ShenandoahConnectionMatrix* _connection_matrix; 313 314 GCMemoryManager _stw_memory_manager; 315 GCMemoryManager _cycle_memory_manager; 316 317 MemoryPool* _memory_pool; 318 319 ShenandoahEvacOOMHandler _oom_evac_handler; 320 321 ShenandoahSharedEnumFlag<GCCycleMode> _gc_cycle_mode; 322 323 PLABStats* _mutator_gclab_stats; 324 PLABStats* _collector_gclab_stats; 325 326 #ifdef ASSERT 327 int _heap_expansion_count; 328 #endif 329 330 public: 331 ShenandoahHeap(ShenandoahCollectorPolicy* policy); 332 333 const char* name() const /* override */; 334 HeapWord* allocate_new_tlab(size_t word_size) /* override */; 335 void print_on(outputStream* st) const /* override */; 336 void print_extended_on(outputStream *st) const /* override */; 337 338 ShenandoahHeap::Name kind() const /* override */{ 339 return CollectedHeap::ShenandoahHeap; 340 } 341 342 jint initialize() /* override */; 343 void post_initialize() /* override */; 344 size_t capacity() const /* override */; 345 size_t used() const /* override */; 346 size_t committed() const; 347 bool is_maximal_no_gc() const /* override */; 348 size_t max_capacity() const /* override */; 349 size_t initial_capacity() const /* override */; 350 bool is_in(const void* p) const /* override */; 351 bool is_scavengable(oop obj) /* override */; 352 HeapWord* mem_allocate(size_t size, bool* what) /* override */; 353 bool can_elide_tlab_store_barriers() const /* override */; 354 oop new_store_pre_barrier(JavaThread* thread, oop new_obj) /* override */; 355 bool can_elide_initializing_store_barrier(oop new_obj) /* override */; 356 bool card_mark_must_follow_store() const /* override */; 357 void collect(GCCause::Cause cause) /* override */; 358 void do_full_collection(bool clear_all_soft_refs) /* override */; 359 AdaptiveSizePolicy* size_policy() /* override */; 360 CollectorPolicy* collector_policy() const /* override */; 361 void ensure_parsability(bool retire_tlabs) /* override */; 362 HeapWord* block_start(const void* addr) const /* override */; 363 size_t block_size(const HeapWord* addr) const /* override */; 364 bool block_is_obj(const HeapWord* addr) const /* override */; 365 jlong millis_since_last_gc() /* override */; 366 void prepare_for_verify() /* override */; 367 void print_gc_threads_on(outputStream* st) const /* override */; 368 void gc_threads_do(ThreadClosure* tcl) const /* override */; 369 void print_tracing_info() const /* override */; 370 void verify(VerifyOption vo) /* override */; 371 bool supports_tlab_allocation() const /* override */; 372 size_t tlab_capacity(Thread *thr) const /* override */; 373 void object_iterate(ObjectClosure* cl) /* override */; 374 void safe_object_iterate(ObjectClosure* cl) /* override */; 375 size_t unsafe_max_tlab_alloc(Thread *thread) const /* override */; 376 size_t max_tlab_size() const /* override */; 377 HeapWord* tlab_post_allocation_setup(HeapWord* obj) /* override */; 378 uint oop_extra_words() /* override */; 379 size_t tlab_used(Thread* ignored) const /* override */; 380 void stop() /* override */; 381 virtual void safepoint_synchronize_begin(); 382 virtual void safepoint_synchronize_end(); 383 384 WorkGang* get_safepoint_workers() { return _safepoint_workers; } 385 386 #ifndef CC_INTERP 387 void compile_prepare_oop(MacroAssembler* masm, Register obj) /* override */; 388 #endif 389 390 void register_nmethod(nmethod* nm); 391 void unregister_nmethod(nmethod* nm); 392 393 /* override: object pinning support */ 394 bool supports_object_pinning() const { return true; } 395 oop pin_object(JavaThread* thread, oop obj); 396 void unpin_object(JavaThread* thread, oop obj); 397 398 static ShenandoahHeap* heap(); 399 static ShenandoahHeap* heap_no_check(); 400 static address in_cset_fast_test_addr(); 401 static address cancelled_concgc_addr(); 402 static address gc_state_addr(); 403 404 ShenandoahCollectorPolicy *shenandoahPolicy() const { return _shenandoah_policy; } 405 ShenandoahPhaseTimings* phase_timings() const { return _phase_timings; } 406 ShenandoahAllocTracker* alloc_tracker() const { return _alloc_tracker; } 407 408 void accumulate_statistics_all_gclabs(); 409 PLABStats* mutator_gclab_stats() const { return _mutator_gclab_stats; } 410 PLABStats* collector_gclab_stats() const { return _collector_gclab_stats; } 411 412 inline ShenandoahHeapRegion* const heap_region_containing(const void* addr) const; 413 inline size_t heap_region_index_containing(const void* addr) const; 414 inline bool requires_marking(const void* entry) const; 415 416 template <class T> 417 inline oop evac_update_with_forwarded(T* p); 418 419 template <class T> 420 inline oop maybe_update_with_forwarded(T* p); 421 422 template <class T> 423 inline oop maybe_update_with_forwarded_not_null(T* p, oop obj); 424 425 template <class T> 426 inline oop update_with_forwarded_not_null(T* p, oop obj); 427 428 void trash_cset_regions(); 429 430 void stop_concurrent_marking(); 431 432 void prepare_for_concurrent_evacuation(); 433 void evacuate_and_update_roots(); 434 // Fixup roots after concurrent cycle failed 435 void fixup_roots(); 436 437 void update_heap_references(bool concurrent); 438 439 void roots_iterate(OopClosure* cl); 440 441 private: 442 void set_gc_state_mask(uint mask, bool value); 443 444 public: 445 void set_concurrent_mark_in_progress(bool in_progress); 446 void set_evacuation_in_progress(bool in_progress); 447 void set_update_refs_in_progress(bool in_progress); 448 void set_degenerated_gc_in_progress(bool in_progress); 449 void set_full_gc_in_progress(bool in_progress); 450 void set_full_gc_move_in_progress(bool in_progress); 451 void set_concurrent_traversal_in_progress(bool in_progress); 452 void set_has_forwarded_objects(bool cond); 453 454 void set_process_references(bool pr); 455 void set_unload_classes(bool uc); 456 457 inline bool is_stable() const; 458 inline bool is_idle() const; 459 inline bool is_concurrent_mark_in_progress() const; 460 inline bool is_update_refs_in_progress() const; 461 inline bool is_evacuation_in_progress() const; 462 inline bool is_degenerated_gc_in_progress() const; 463 inline bool is_full_gc_in_progress() const; 464 inline bool is_full_gc_move_in_progress() const; 465 inline bool is_concurrent_traversal_in_progress() const; 466 inline bool has_forwarded_objects() const; 467 inline bool is_gc_in_progress_mask(uint mask) const; 468 469 char gc_state(); 470 471 bool process_references() const; 472 bool unload_classes() const; 473 474 bool is_minor_gc() const; 475 bool is_major_gc() const; 476 void set_cycle_mode(GCCycleMode gc_cycle_mode); 477 478 inline bool region_in_collection_set(size_t region_index) const; 479 480 // Mainly there to avoid accidentally calling the templated 481 // method below with ShenandoahHeapRegion* which would be *wrong*. 482 inline bool in_collection_set(ShenandoahHeapRegion* r) const; 483 484 template <class T> 485 inline bool in_collection_set(T obj) const; 486 487 inline bool allocated_after_next_mark_start(HeapWord* addr) const; 488 void set_next_top_at_mark_start(HeapWord* region_base, HeapWord* addr); 489 HeapWord* next_top_at_mark_start(HeapWord* region_base); 490 491 inline bool allocated_after_complete_mark_start(HeapWord* addr) const; 492 void set_complete_top_at_mark_start(HeapWord* region_base, HeapWord* addr); 493 HeapWord* complete_top_at_mark_start(HeapWord* region_base); 494 495 // Evacuates object src. Returns the evacuated object if this thread 496 // succeeded, otherwise rolls back the evacuation and returns the 497 // evacuated object by the competing thread. 498 inline oop evacuate_object(oop src, Thread* thread); 499 inline bool cancelled_concgc() const; 500 inline bool check_cancelled_concgc_and_yield(bool sts_active = true); 501 inline bool try_cancel_concgc(); 502 inline void clear_cancelled_concgc(); 503 504 inline ShenandoahHeapRegion* const get_region(size_t region_idx) const; 505 void heap_region_iterate(ShenandoahHeapRegionClosure& cl) const; 506 507 ShenandoahFreeSet* free_set() const { return _free_set; } 508 ShenandoahCollectionSet* collection_set() const { return _collection_set; } 509 510 ShenandoahConnectionMatrix* connection_matrix() const; 511 512 void increase_used(size_t bytes); 513 void decrease_used(size_t bytes); 514 515 void set_used(size_t bytes); 516 517 void increase_committed(size_t bytes); 518 void decrease_committed(size_t bytes); 519 520 void increase_allocated(size_t bytes); 521 522 void notify_alloc(size_t words, bool waste); 523 524 void handle_heap_shrinkage(double shrink_before); 525 526 void reset_next_mark_bitmap(); 527 void reset_next_mark_bitmap_traversal(); 528 529 MarkBitMap* complete_mark_bit_map(); 530 MarkBitMap* next_mark_bit_map(); 531 inline bool is_marked_complete(oop obj) const; 532 inline bool mark_next(oop obj) const; 533 inline bool is_marked_next(oop obj) const; 534 bool is_next_bitmap_clear(); 535 bool is_next_bitmap_clear_range(HeapWord* start, HeapWord* end); 536 bool is_complete_bitmap_clear_range(HeapWord* start, HeapWord* end); 537 538 bool commit_bitmap_slice(ShenandoahHeapRegion *r); 539 bool uncommit_bitmap_slice(ShenandoahHeapRegion *r); 540 541 // Hint that the bitmap slice is not needed 542 bool idle_bitmap_slice(ShenandoahHeapRegion* r); 543 void activate_bitmap_slice(ShenandoahHeapRegion* r); 544 545 bool is_bitmap_slice_committed(ShenandoahHeapRegion* r, bool skip_self = false); 546 547 void print_heap_regions_on(outputStream* st) const; 548 549 size_t bytes_allocated_since_gc_start(); 550 void reset_bytes_allocated_since_gc_start(); 551 552 void trash_humongous_region_at(ShenandoahHeapRegion *r); 553 554 virtual GrowableArray<GCMemoryManager*> memory_managers(); 555 virtual GrowableArray<MemoryPool*> memory_pools(); 556 557 ShenandoahMonitoringSupport* monitoring_support(); 558 ShenandoahConcurrentMark* concurrentMark() { return _scm; } 559 ShenandoahMarkCompact* full_gc() { return _full_gc; } 560 ShenandoahTraversalGC* traversal_gc(); 561 ShenandoahVerifier* verifier(); 562 ShenandoahPacer* pacer() const; 563 564 ReferenceProcessor* ref_processor() { return _ref_processor;} 565 566 WorkGang* workers() const { return _workers;} 567 568 uint max_workers(); 569 570 void assert_gc_workers(uint nworker) PRODUCT_RETURN; 571 572 void do_evacuation(); 573 ShenandoahHeapRegion* next_compaction_region(const ShenandoahHeapRegion* r); 574 575 void heap_region_iterate(ShenandoahHeapRegionClosure* blk, bool skip_cset_regions = false, bool skip_humongous_continuation = false) const; 576 577 // Delete entries for dead interned string and clean up unreferenced symbols 578 // in symbol table, possibly in parallel. 579 void unload_classes_and_cleanup_tables(bool full_gc); 580 581 inline size_t num_regions() const { return _num_regions; } 582 583 BoolObjectClosure* is_alive_closure(); 584 585 // Call before starting evacuation. 586 void enter_evacuation(); 587 // Call after finished with evacuation. 588 void leave_evacuation(); 589 590 void initialize_gclab(Thread* thread); 591 void finalize_mutator_gclab(Thread* thread); 592 593 private: 594 template<class T> 595 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit); 596 597 template<class T> 598 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit); 599 600 public: 601 template<class T> 602 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl); 603 604 template<class T> 605 inline void marked_object_safe_iterate(ShenandoahHeapRegion* region, T* cl); 606 607 template<class T> 608 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl); 609 610 template<class T> 611 inline void marked_object_oop_safe_iterate(ShenandoahHeapRegion* region, T* cl); 612 613 GCTimer* gc_timer() const; 614 615 void swap_mark_bitmaps(); 616 617 void cancel_concgc(GCCause::Cause cause); 618 619 ShenandoahHeapLock* lock() { return &_lock; } 620 void assert_heaplock_owned_by_current_thread() PRODUCT_RETURN; 621 void assert_heaplock_not_owned_by_current_thread() PRODUCT_RETURN; 622 void assert_heaplock_or_safepoint() PRODUCT_RETURN; 623 624 public: 625 typedef enum { 626 _alloc_shared, // Allocate common, outside of TLAB 627 _alloc_shared_gc, // Allocate common, outside of GCLAB 628 _alloc_tlab, // Allocate TLAB 629 _alloc_gclab, // Allocate GCLAB 630 _ALLOC_LIMIT, 631 } AllocType; 632 633 static const char* alloc_type_to_string(AllocType type) { 634 switch (type) { 635 case _alloc_shared: 636 return "Shared"; 637 case _alloc_shared_gc: 638 return "Shared GC"; 639 case _alloc_tlab: 640 return "TLAB"; 641 case _alloc_gclab: 642 return "GCLAB"; 643 default: 644 ShouldNotReachHere(); 645 return ""; 646 } 647 } 648 private: 649 650 virtual void initialize_serviceability(); 651 652 HeapWord* allocate_new_lab(size_t word_size, AllocType type); 653 HeapWord* allocate_memory_under_lock(size_t word_size, AllocType type, bool &new_region); 654 HeapWord* allocate_memory(size_t word_size, AllocType type); 655 // Shenandoah functionality. 656 inline HeapWord* allocate_from_gclab(Thread* thread, size_t size); 657 HeapWord* allocate_from_gclab_slow(Thread* thread, size_t size); 658 HeapWord* allocate_new_gclab(size_t word_size); 659 660 template<class T> 661 inline void do_object_marked_complete(T* cl, oop obj); 662 663 ShenandoahControlThread* control_thread() { return _control_thread; } 664 665 public: 666 inline oop atomic_compare_exchange_oop(oop n, narrowOop* addr, oop c); 667 inline oop atomic_compare_exchange_oop(oop n, oop* addr, oop c); 668 669 private: 670 void ref_processing_init(); 671 672 GCTracer* tracer(); 673 674 private: 675 uint64_t _alloc_seq_at_last_gc_start; 676 uint64_t _alloc_seq_at_last_gc_end; 677 size_t _used_at_last_gc; 678 679 public: 680 uint64_t alloc_seq_at_last_gc_end() const { return _alloc_seq_at_last_gc_end; } 681 uint64_t alloc_seq_at_last_gc_start() const { return _alloc_seq_at_last_gc_start;} 682 size_t used_at_last_gc() const { return _used_at_last_gc;} 683 684 void set_alloc_seq_gc_start(); 685 void set_alloc_seq_gc_end(); 686 687 void set_used_at_last_gc() {_used_at_last_gc = used();} 688 689 void make_tlabs_parsable(bool retire_tlabs) /* override */; 690 691 GCMemoryManager* cycle_memory_manager() { return &_cycle_memory_manager; } 692 GCMemoryManager* stw_memory_manager() { return &_stw_memory_manager; } 693 694 public: 695 // Entry points to STW GC operations, these cause a related safepoint, that then 696 // call the entry method below 697 void vmop_entry_init_mark(); 698 void vmop_entry_final_mark(); 699 void vmop_entry_final_evac(); 700 void vmop_entry_init_updaterefs(); 701 void vmop_entry_final_updaterefs(); 702 void vmop_entry_init_traversal(); 703 void vmop_entry_final_traversal(); 704 void vmop_entry_full(GCCause::Cause cause); 705 void vmop_degenerated(ShenandoahDegenPoint point); 706 707 // Entry methods to normally STW GC operations. These set up logging, monitoring 708 // and workers for net VM operation 709 void entry_init_mark(); 710 void entry_final_mark(); 711 void entry_final_evac(); 712 void entry_init_updaterefs(); 713 void entry_final_updaterefs(); 714 void entry_init_traversal(); 715 void entry_final_traversal(); 716 void entry_full(GCCause::Cause cause); 717 void entry_degenerated(int point); 718 719 // Entry methods to normally concurrent GC operations. These set up logging, monitoring 720 // for concurrent operation. 721 void entry_mark(); 722 void entry_preclean(); 723 void entry_cleanup(); 724 void entry_cleanup_bitmaps(); 725 void entry_cleanup_traversal(); 726 void entry_evac(); 727 void entry_updaterefs(); 728 void entry_traversal(); 729 730 private: 731 // Actual work for the phases 732 void op_init_mark(); 733 void op_final_mark(); 734 void op_final_evac(); 735 void op_init_updaterefs(); 736 void op_final_updaterefs(); 737 void op_init_traversal(); 738 void op_final_traversal(); 739 void op_full(GCCause::Cause cause); 740 void op_degenerated(ShenandoahDegenPoint point); 741 void op_degenerated_fail(); 742 void op_degenerated_futile(); 743 744 void op_mark(); 745 void op_preclean(); 746 void op_cleanup(); 747 void op_evac(); 748 void op_updaterefs(); 749 void op_cleanup_bitmaps(); 750 void op_cleanup_traversal(); 751 void op_traversal(); 752 753 private: 754 void try_inject_alloc_failure(); 755 bool should_inject_alloc_failure(); 756 }; 757 758 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP