1 /* 2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 #include "precompiled.hpp" 25 #include "gc_interface/collectedHeap.hpp" 26 #include "memory/allocation.hpp" 27 #include "memory/binaryTreeDictionary.hpp" 28 #include "memory/freeList.hpp" 29 #include "memory/collectorPolicy.hpp" 30 #include "memory/filemap.hpp" 31 #include "memory/freeList.hpp" 32 #include "memory/gcLocker.hpp" 33 #include "memory/metachunk.hpp" 34 #include "memory/metaspace.hpp" 35 #include "memory/metaspaceGCThresholdUpdater.hpp" 36 #include "memory/metaspaceShared.hpp" 37 #include "memory/metaspaceTracer.hpp" 38 #include "memory/resourceArea.hpp" 39 #include "memory/universe.hpp" 40 #include "runtime/atomic.inline.hpp" 41 #include "runtime/globals.hpp" 42 #include "runtime/init.hpp" 43 #include "runtime/java.hpp" 44 #include "runtime/mutex.hpp" 45 #include "runtime/orderAccess.inline.hpp" 46 #include "services/memTracker.hpp" 47 #include "services/memoryService.hpp" 48 #include "utilities/copy.hpp" 49 #include "utilities/debug.hpp" 50 #include "utilities/macros.hpp" 51 52 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 53 54 typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary; 55 typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary; 56 57 // Set this constant to enable slow integrity checking of the free chunk lists 58 const bool metaspace_slow_verify = false; 59 60 size_t const allocation_from_dictionary_limit = 4 * K; 61 62 MetaWord* last_allocated = 0; 63 64 size_t Metaspace::_compressed_class_space_size; 65 const MetaspaceTracer* Metaspace::_tracer = NULL; 66 67 // Used in declarations in SpaceManager and ChunkManager 68 enum ChunkIndex { 69 ZeroIndex = 0, 70 SpecializedIndex = ZeroIndex, 71 SmallIndex = SpecializedIndex + 1, 72 MediumIndex = SmallIndex + 1, 73 HumongousIndex = MediumIndex + 1, 74 NumberOfFreeLists = 3, 75 NumberOfInUseLists = 4 76 }; 77 78 enum ChunkSizes { // in words. 79 ClassSpecializedChunk = 128, 80 SpecializedChunk = 128, 81 ClassSmallChunk = 256, 82 SmallChunk = 512, 83 ClassMediumChunk = 4 * K, 84 MediumChunk = 8 * K 85 }; 86 87 static ChunkIndex next_chunk_index(ChunkIndex i) { 88 assert(i < NumberOfInUseLists, "Out of bound"); 89 return (ChunkIndex) (i+1); 90 } 91 92 volatile intptr_t MetaspaceGC::_capacity_until_GC = 0; 93 uint MetaspaceGC::_shrink_factor = 0; 94 bool MetaspaceGC::_should_concurrent_collect = false; 95 96 typedef class FreeList<Metachunk> ChunkList; 97 98 // Manages the global free lists of chunks. 99 class ChunkManager : public CHeapObj<mtInternal> { 100 friend class TestVirtualSpaceNodeTest; 101 102 // Free list of chunks of different sizes. 103 // SpecializedChunk 104 // SmallChunk 105 // MediumChunk 106 // HumongousChunk 107 ChunkList _free_chunks[NumberOfFreeLists]; 108 109 // HumongousChunk 110 ChunkTreeDictionary _humongous_dictionary; 111 112 // ChunkManager in all lists of this type 113 size_t _free_chunks_total; 114 size_t _free_chunks_count; 115 116 void dec_free_chunks_total(size_t v) { 117 assert(_free_chunks_count > 0 && 118 _free_chunks_total > 0, 119 "About to go negative"); 120 Atomic::add_ptr(-1, &_free_chunks_count); 121 jlong minus_v = (jlong) - (jlong) v; 122 Atomic::add_ptr(minus_v, &_free_chunks_total); 123 } 124 125 // Debug support 126 127 size_t sum_free_chunks(); 128 size_t sum_free_chunks_count(); 129 130 void locked_verify_free_chunks_total(); 131 void slow_locked_verify_free_chunks_total() { 132 if (metaspace_slow_verify) { 133 locked_verify_free_chunks_total(); 134 } 135 } 136 void locked_verify_free_chunks_count(); 137 void slow_locked_verify_free_chunks_count() { 138 if (metaspace_slow_verify) { 139 locked_verify_free_chunks_count(); 140 } 141 } 142 void verify_free_chunks_count(); 143 144 public: 145 146 ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size) 147 : _free_chunks_total(0), _free_chunks_count(0) { 148 _free_chunks[SpecializedIndex].set_size(specialized_size); 149 _free_chunks[SmallIndex].set_size(small_size); 150 _free_chunks[MediumIndex].set_size(medium_size); 151 } 152 153 // add or delete (return) a chunk to the global freelist. 154 Metachunk* chunk_freelist_allocate(size_t word_size); 155 156 // Map a size to a list index assuming that there are lists 157 // for special, small, medium, and humongous chunks. 158 static ChunkIndex list_index(size_t size); 159 160 // Remove the chunk from its freelist. It is 161 // expected to be on one of the _free_chunks[] lists. 162 void remove_chunk(Metachunk* chunk); 163 164 // Add the simple linked list of chunks to the freelist of chunks 165 // of type index. 166 void return_chunks(ChunkIndex index, Metachunk* chunks); 167 168 // Total of the space in the free chunks list 169 size_t free_chunks_total_words(); 170 size_t free_chunks_total_bytes(); 171 172 // Number of chunks in the free chunks list 173 size_t free_chunks_count(); 174 175 void inc_free_chunks_total(size_t v, size_t count = 1) { 176 Atomic::add_ptr(count, &_free_chunks_count); 177 Atomic::add_ptr(v, &_free_chunks_total); 178 } 179 ChunkTreeDictionary* humongous_dictionary() { 180 return &_humongous_dictionary; 181 } 182 183 ChunkList* free_chunks(ChunkIndex index); 184 185 // Returns the list for the given chunk word size. 186 ChunkList* find_free_chunks_list(size_t word_size); 187 188 // Remove from a list by size. Selects list based on size of chunk. 189 Metachunk* free_chunks_get(size_t chunk_word_size); 190 191 #define index_bounds_check(index) \ 192 assert(index == SpecializedIndex || \ 193 index == SmallIndex || \ 194 index == MediumIndex || \ 195 index == HumongousIndex, err_msg("Bad index: %d", (int) index)) 196 197 size_t num_free_chunks(ChunkIndex index) const { 198 index_bounds_check(index); 199 200 if (index == HumongousIndex) { 201 return _humongous_dictionary.total_free_blocks(); 202 } 203 204 ssize_t count = _free_chunks[index].count(); 205 return count == -1 ? 0 : (size_t) count; 206 } 207 208 size_t size_free_chunks_in_bytes(ChunkIndex index) const { 209 index_bounds_check(index); 210 211 size_t word_size = 0; 212 if (index == HumongousIndex) { 213 word_size = _humongous_dictionary.total_size(); 214 } else { 215 const size_t size_per_chunk_in_words = _free_chunks[index].size(); 216 word_size = size_per_chunk_in_words * num_free_chunks(index); 217 } 218 219 return word_size * BytesPerWord; 220 } 221 222 MetaspaceChunkFreeListSummary chunk_free_list_summary() const { 223 return MetaspaceChunkFreeListSummary(num_free_chunks(SpecializedIndex), 224 num_free_chunks(SmallIndex), 225 num_free_chunks(MediumIndex), 226 num_free_chunks(HumongousIndex), 227 size_free_chunks_in_bytes(SpecializedIndex), 228 size_free_chunks_in_bytes(SmallIndex), 229 size_free_chunks_in_bytes(MediumIndex), 230 size_free_chunks_in_bytes(HumongousIndex)); 231 } 232 233 // Debug support 234 void verify(); 235 void slow_verify() { 236 if (metaspace_slow_verify) { 237 verify(); 238 } 239 } 240 void locked_verify(); 241 void slow_locked_verify() { 242 if (metaspace_slow_verify) { 243 locked_verify(); 244 } 245 } 246 void verify_free_chunks_total(); 247 248 void locked_print_free_chunks(outputStream* st); 249 void locked_print_sum_free_chunks(outputStream* st); 250 251 void print_on(outputStream* st) const; 252 }; 253 254 // Used to manage the free list of Metablocks (a block corresponds 255 // to the allocation of a quantum of metadata). 256 class BlockFreelist VALUE_OBJ_CLASS_SPEC { 257 BlockTreeDictionary* _dictionary; 258 259 // Only allocate and split from freelist if the size of the allocation 260 // is at least 1/4th the size of the available block. 261 const static int WasteMultiplier = 4; 262 263 // Accessors 264 BlockTreeDictionary* dictionary() const { return _dictionary; } 265 266 public: 267 BlockFreelist(); 268 ~BlockFreelist(); 269 270 // Get and return a block to the free list 271 MetaWord* get_block(size_t word_size); 272 void return_block(MetaWord* p, size_t word_size); 273 274 size_t total_size() { 275 if (dictionary() == NULL) { 276 return 0; 277 } else { 278 return dictionary()->total_size(); 279 } 280 } 281 282 void print_on(outputStream* st) const; 283 }; 284 285 // A VirtualSpaceList node. 286 class VirtualSpaceNode : public CHeapObj<mtClass> { 287 friend class VirtualSpaceList; 288 289 // Link to next VirtualSpaceNode 290 VirtualSpaceNode* _next; 291 292 // total in the VirtualSpace 293 MemRegion _reserved; 294 ReservedSpace _rs; 295 VirtualSpace _virtual_space; 296 MetaWord* _top; 297 // count of chunks contained in this VirtualSpace 298 uintx _container_count; 299 300 // Convenience functions to access the _virtual_space 301 char* low() const { return virtual_space()->low(); } 302 char* high() const { return virtual_space()->high(); } 303 304 // The first Metachunk will be allocated at the bottom of the 305 // VirtualSpace 306 Metachunk* first_chunk() { return (Metachunk*) bottom(); } 307 308 // Committed but unused space in the virtual space 309 size_t free_words_in_vs() const; 310 public: 311 312 VirtualSpaceNode(size_t byte_size); 313 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {} 314 ~VirtualSpaceNode(); 315 316 // Convenience functions for logical bottom and end 317 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } 318 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } 319 320 bool contains(const void* ptr) { return ptr >= low() && ptr < high(); } 321 322 size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; } 323 size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; } 324 325 bool is_pre_committed() const { return _virtual_space.special(); } 326 327 // address of next available space in _virtual_space; 328 // Accessors 329 VirtualSpaceNode* next() { return _next; } 330 void set_next(VirtualSpaceNode* v) { _next = v; } 331 332 void set_reserved(MemRegion const v) { _reserved = v; } 333 void set_top(MetaWord* v) { _top = v; } 334 335 // Accessors 336 MemRegion* reserved() { return &_reserved; } 337 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } 338 339 // Returns true if "word_size" is available in the VirtualSpace 340 bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); } 341 342 MetaWord* top() const { return _top; } 343 void inc_top(size_t word_size) { _top += word_size; } 344 345 uintx container_count() { return _container_count; } 346 void inc_container_count(); 347 void dec_container_count(); 348 #ifdef ASSERT 349 uint container_count_slow(); 350 void verify_container_count(); 351 #endif 352 353 // used and capacity in this single entry in the list 354 size_t used_words_in_vs() const; 355 size_t capacity_words_in_vs() const; 356 357 bool initialize(); 358 359 // get space from the virtual space 360 Metachunk* take_from_committed(size_t chunk_word_size); 361 362 // Allocate a chunk from the virtual space and return it. 363 Metachunk* get_chunk_vs(size_t chunk_word_size); 364 365 // Expands/shrinks the committed space in a virtual space. Delegates 366 // to Virtualspace 367 bool expand_by(size_t min_words, size_t preferred_words); 368 369 // In preparation for deleting this node, remove all the chunks 370 // in the node from any freelist. 371 void purge(ChunkManager* chunk_manager); 372 373 // If an allocation doesn't fit in the current node a new node is created. 374 // Allocate chunks out of the remaining committed space in this node 375 // to avoid wasting that memory. 376 // This always adds up because all the chunk sizes are multiples of 377 // the smallest chunk size. 378 void retire(ChunkManager* chunk_manager); 379 380 #ifdef ASSERT 381 // Debug support 382 void mangle(); 383 #endif 384 385 void print_on(outputStream* st) const; 386 }; 387 388 #define assert_is_ptr_aligned(ptr, alignment) \ 389 assert(is_ptr_aligned(ptr, alignment), \ 390 err_msg(PTR_FORMAT " is not aligned to " \ 391 SIZE_FORMAT, ptr, alignment)) 392 393 #define assert_is_size_aligned(size, alignment) \ 394 assert(is_size_aligned(size, alignment), \ 395 err_msg(SIZE_FORMAT " is not aligned to " \ 396 SIZE_FORMAT, size, alignment)) 397 398 399 // Decide if large pages should be committed when the memory is reserved. 400 static bool should_commit_large_pages_when_reserving(size_t bytes) { 401 if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) { 402 size_t words = bytes / BytesPerWord; 403 bool is_class = false; // We never reserve large pages for the class space. 404 if (MetaspaceGC::can_expand(words, is_class) && 405 MetaspaceGC::allowed_expansion() >= words) { 406 return true; 407 } 408 } 409 410 return false; 411 } 412 413 // byte_size is the size of the associated virtualspace. 414 VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) { 415 assert_is_size_aligned(bytes, Metaspace::reserve_alignment()); 416 417 #if INCLUDE_CDS 418 // This allocates memory with mmap. For DumpSharedspaces, try to reserve 419 // configurable address, generally at the top of the Java heap so other 420 // memory addresses don't conflict. 421 if (DumpSharedSpaces) { 422 bool large_pages = false; // No large pages when dumping the CDS archive. 423 char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment()); 424 425 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base, 0); 426 if (_rs.is_reserved()) { 427 assert(shared_base == 0 || _rs.base() == shared_base, "should match"); 428 } else { 429 // Get a mmap region anywhere if the SharedBaseAddress fails. 430 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages); 431 } 432 MetaspaceShared::set_shared_rs(&_rs); 433 } else 434 #endif 435 { 436 bool large_pages = should_commit_large_pages_when_reserving(bytes); 437 438 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages); 439 } 440 441 if (_rs.is_reserved()) { 442 assert(_rs.base() != NULL, "Catch if we get a NULL address"); 443 assert(_rs.size() != 0, "Catch if we get a 0 size"); 444 assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment()); 445 assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment()); 446 447 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); 448 } 449 } 450 451 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) { 452 Metachunk* chunk = first_chunk(); 453 Metachunk* invalid_chunk = (Metachunk*) top(); 454 while (chunk < invalid_chunk ) { 455 assert(chunk->is_tagged_free(), "Should be tagged free"); 456 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size(); 457 chunk_manager->remove_chunk(chunk); 458 assert(chunk->next() == NULL && 459 chunk->prev() == NULL, 460 "Was not removed from its list"); 461 chunk = (Metachunk*) next; 462 } 463 } 464 465 #ifdef ASSERT 466 uint VirtualSpaceNode::container_count_slow() { 467 uint count = 0; 468 Metachunk* chunk = first_chunk(); 469 Metachunk* invalid_chunk = (Metachunk*) top(); 470 while (chunk < invalid_chunk ) { 471 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size(); 472 // Don't count the chunks on the free lists. Those are 473 // still part of the VirtualSpaceNode but not currently 474 // counted. 475 if (!chunk->is_tagged_free()) { 476 count++; 477 } 478 chunk = (Metachunk*) next; 479 } 480 return count; 481 } 482 #endif 483 484 // List of VirtualSpaces for metadata allocation. 485 class VirtualSpaceList : public CHeapObj<mtClass> { 486 friend class VirtualSpaceNode; 487 488 enum VirtualSpaceSizes { 489 VirtualSpaceSize = 256 * K 490 }; 491 492 // Head of the list 493 VirtualSpaceNode* _virtual_space_list; 494 // virtual space currently being used for allocations 495 VirtualSpaceNode* _current_virtual_space; 496 497 // Is this VirtualSpaceList used for the compressed class space 498 bool _is_class; 499 500 // Sum of reserved and committed memory in the virtual spaces 501 size_t _reserved_words; 502 size_t _committed_words; 503 504 // Number of virtual spaces 505 size_t _virtual_space_count; 506 507 ~VirtualSpaceList(); 508 509 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } 510 511 void set_virtual_space_list(VirtualSpaceNode* v) { 512 _virtual_space_list = v; 513 } 514 void set_current_virtual_space(VirtualSpaceNode* v) { 515 _current_virtual_space = v; 516 } 517 518 void link_vs(VirtualSpaceNode* new_entry); 519 520 // Get another virtual space and add it to the list. This 521 // is typically prompted by a failed attempt to allocate a chunk 522 // and is typically followed by the allocation of a chunk. 523 bool create_new_virtual_space(size_t vs_word_size); 524 525 // Chunk up the unused committed space in the current 526 // virtual space and add the chunks to the free list. 527 void retire_current_virtual_space(); 528 529 public: 530 VirtualSpaceList(size_t word_size); 531 VirtualSpaceList(ReservedSpace rs); 532 533 size_t free_bytes(); 534 535 Metachunk* get_new_chunk(size_t word_size, 536 size_t grow_chunks_by_words, 537 size_t medium_chunk_bunch); 538 539 bool expand_node_by(VirtualSpaceNode* node, 540 size_t min_words, 541 size_t preferred_words); 542 543 bool expand_by(size_t min_words, 544 size_t preferred_words); 545 546 VirtualSpaceNode* current_virtual_space() { 547 return _current_virtual_space; 548 } 549 550 bool is_class() const { return _is_class; } 551 552 bool initialization_succeeded() { return _virtual_space_list != NULL; } 553 554 size_t reserved_words() { return _reserved_words; } 555 size_t reserved_bytes() { return reserved_words() * BytesPerWord; } 556 size_t committed_words() { return _committed_words; } 557 size_t committed_bytes() { return committed_words() * BytesPerWord; } 558 559 void inc_reserved_words(size_t v); 560 void dec_reserved_words(size_t v); 561 void inc_committed_words(size_t v); 562 void dec_committed_words(size_t v); 563 void inc_virtual_space_count(); 564 void dec_virtual_space_count(); 565 566 bool contains(const void* ptr); 567 568 // Unlink empty VirtualSpaceNodes and free it. 569 void purge(ChunkManager* chunk_manager); 570 571 void print_on(outputStream* st) const; 572 573 class VirtualSpaceListIterator : public StackObj { 574 VirtualSpaceNode* _virtual_spaces; 575 public: 576 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : 577 _virtual_spaces(virtual_spaces) {} 578 579 bool repeat() { 580 return _virtual_spaces != NULL; 581 } 582 583 VirtualSpaceNode* get_next() { 584 VirtualSpaceNode* result = _virtual_spaces; 585 if (_virtual_spaces != NULL) { 586 _virtual_spaces = _virtual_spaces->next(); 587 } 588 return result; 589 } 590 }; 591 }; 592 593 class Metadebug : AllStatic { 594 // Debugging support for Metaspaces 595 static int _allocation_fail_alot_count; 596 597 public: 598 599 static void init_allocation_fail_alot_count(); 600 #ifdef ASSERT 601 static bool test_metadata_failure(); 602 #endif 603 }; 604 605 int Metadebug::_allocation_fail_alot_count = 0; 606 607 // SpaceManager - used by Metaspace to handle allocations 608 class SpaceManager : public CHeapObj<mtClass> { 609 friend class Metaspace; 610 friend class Metadebug; 611 612 private: 613 614 // protects allocations 615 Mutex* const _lock; 616 617 // Type of metadata allocated. 618 Metaspace::MetadataType _mdtype; 619 620 // List of chunks in use by this SpaceManager. Allocations 621 // are done from the current chunk. The list is used for deallocating 622 // chunks when the SpaceManager is freed. 623 Metachunk* _chunks_in_use[NumberOfInUseLists]; 624 Metachunk* _current_chunk; 625 626 // Number of small chunks to allocate to a manager 627 // If class space manager, small chunks are unlimited 628 static uint const _small_chunk_limit; 629 630 // Sum of all space in allocated chunks 631 size_t _allocated_blocks_words; 632 633 // Sum of all allocated chunks 634 size_t _allocated_chunks_words; 635 size_t _allocated_chunks_count; 636 637 // Free lists of blocks are per SpaceManager since they 638 // are assumed to be in chunks in use by the SpaceManager 639 // and all chunks in use by a SpaceManager are freed when 640 // the class loader using the SpaceManager is collected. 641 BlockFreelist _block_freelists; 642 643 // protects virtualspace and chunk expansions 644 static const char* _expand_lock_name; 645 static const int _expand_lock_rank; 646 static Mutex* const _expand_lock; 647 648 private: 649 // Accessors 650 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } 651 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { 652 _chunks_in_use[index] = v; 653 } 654 655 BlockFreelist* block_freelists() const { 656 return (BlockFreelist*) &_block_freelists; 657 } 658 659 Metaspace::MetadataType mdtype() { return _mdtype; } 660 661 VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); } 662 ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); } 663 664 Metachunk* current_chunk() const { return _current_chunk; } 665 void set_current_chunk(Metachunk* v) { 666 _current_chunk = v; 667 } 668 669 Metachunk* find_current_chunk(size_t word_size); 670 671 // Add chunk to the list of chunks in use 672 void add_chunk(Metachunk* v, bool make_current); 673 void retire_current_chunk(); 674 675 Mutex* lock() const { return _lock; } 676 677 const char* chunk_size_name(ChunkIndex index) const; 678 679 protected: 680 void initialize(); 681 682 public: 683 SpaceManager(Metaspace::MetadataType mdtype, 684 Mutex* lock); 685 ~SpaceManager(); 686 687 enum ChunkMultiples { 688 MediumChunkMultiple = 4 689 }; 690 691 bool is_class() { return _mdtype == Metaspace::ClassType; } 692 693 // Accessors 694 size_t specialized_chunk_size() { return (size_t) is_class() ? ClassSpecializedChunk : SpecializedChunk; } 695 size_t small_chunk_size() { return (size_t) is_class() ? ClassSmallChunk : SmallChunk; } 696 size_t medium_chunk_size() { return (size_t) is_class() ? ClassMediumChunk : MediumChunk; } 697 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; } 698 699 size_t smallest_chunk_size() { return specialized_chunk_size(); } 700 701 size_t allocated_blocks_words() const { return _allocated_blocks_words; } 702 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; } 703 size_t allocated_chunks_words() const { return _allocated_chunks_words; } 704 size_t allocated_chunks_bytes() const { return _allocated_chunks_words * BytesPerWord; } 705 size_t allocated_chunks_count() const { return _allocated_chunks_count; } 706 707 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } 708 709 static Mutex* expand_lock() { return _expand_lock; } 710 711 // Increment the per Metaspace and global running sums for Metachunks 712 // by the given size. This is used when a Metachunk to added to 713 // the in-use list. 714 void inc_size_metrics(size_t words); 715 // Increment the per Metaspace and global running sums Metablocks by the given 716 // size. This is used when a Metablock is allocated. 717 void inc_used_metrics(size_t words); 718 // Delete the portion of the running sums for this SpaceManager. That is, 719 // the globals running sums for the Metachunks and Metablocks are 720 // decremented for all the Metachunks in-use by this SpaceManager. 721 void dec_total_from_size_metrics(); 722 723 // Set the sizes for the initial chunks. 724 void get_initial_chunk_sizes(Metaspace::MetaspaceType type, 725 size_t* chunk_word_size, 726 size_t* class_chunk_word_size); 727 728 size_t sum_capacity_in_chunks_in_use() const; 729 size_t sum_used_in_chunks_in_use() const; 730 size_t sum_free_in_chunks_in_use() const; 731 size_t sum_waste_in_chunks_in_use() const; 732 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; 733 734 size_t sum_count_in_chunks_in_use(); 735 size_t sum_count_in_chunks_in_use(ChunkIndex i); 736 737 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); 738 739 // Block allocation and deallocation. 740 // Allocates a block from the current chunk 741 MetaWord* allocate(size_t word_size); 742 743 // Helper for allocations 744 MetaWord* allocate_work(size_t word_size); 745 746 // Returns a block to the per manager freelist 747 void deallocate(MetaWord* p, size_t word_size); 748 749 // Based on the allocation size and a minimum chunk size, 750 // returned chunk size (for expanding space for chunk allocation). 751 size_t calc_chunk_size(size_t allocation_word_size); 752 753 // Called when an allocation from the current chunk fails. 754 // Gets a new chunk (may require getting a new virtual space), 755 // and allocates from that chunk. 756 MetaWord* grow_and_allocate(size_t word_size); 757 758 // Notify memory usage to MemoryService. 759 void track_metaspace_memory_usage(); 760 761 // debugging support. 762 763 void dump(outputStream* const out) const; 764 void print_on(outputStream* st) const; 765 void locked_print_chunks_in_use_on(outputStream* st) const; 766 767 void verify(); 768 void verify_chunk_size(Metachunk* chunk); 769 NOT_PRODUCT(void mangle_freed_chunks();) 770 #ifdef ASSERT 771 void verify_allocated_blocks_words(); 772 #endif 773 774 size_t get_raw_word_size(size_t word_size) { 775 size_t byte_size = word_size * BytesPerWord; 776 777 size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock)); 778 raw_bytes_size = align_size_up(raw_bytes_size, Metachunk::object_alignment()); 779 780 size_t raw_word_size = raw_bytes_size / BytesPerWord; 781 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); 782 783 return raw_word_size; 784 } 785 }; 786 787 uint const SpaceManager::_small_chunk_limit = 4; 788 789 const char* SpaceManager::_expand_lock_name = 790 "SpaceManager chunk allocation lock"; 791 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; 792 Mutex* const SpaceManager::_expand_lock = 793 new Mutex(SpaceManager::_expand_lock_rank, 794 SpaceManager::_expand_lock_name, 795 Mutex::_allow_vm_block_flag); 796 797 void VirtualSpaceNode::inc_container_count() { 798 assert_lock_strong(SpaceManager::expand_lock()); 799 _container_count++; 800 assert(_container_count == container_count_slow(), 801 err_msg("Inconsistency in container_count _container_count " SIZE_FORMAT 802 " container_count_slow() " SIZE_FORMAT, 803 _container_count, container_count_slow())); 804 } 805 806 void VirtualSpaceNode::dec_container_count() { 807 assert_lock_strong(SpaceManager::expand_lock()); 808 _container_count--; 809 } 810 811 #ifdef ASSERT 812 void VirtualSpaceNode::verify_container_count() { 813 assert(_container_count == container_count_slow(), 814 err_msg("Inconsistency in container_count _container_count " SIZE_FORMAT 815 " container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow())); 816 } 817 #endif 818 819 // BlockFreelist methods 820 821 BlockFreelist::BlockFreelist() : _dictionary(NULL) {} 822 823 BlockFreelist::~BlockFreelist() { 824 if (_dictionary != NULL) { 825 if (Verbose && TraceMetadataChunkAllocation) { 826 _dictionary->print_free_lists(gclog_or_tty); 827 } 828 delete _dictionary; 829 } 830 } 831 832 void BlockFreelist::return_block(MetaWord* p, size_t word_size) { 833 Metablock* free_chunk = ::new (p) Metablock(word_size); 834 if (dictionary() == NULL) { 835 _dictionary = new BlockTreeDictionary(); 836 } 837 dictionary()->return_chunk(free_chunk); 838 } 839 840 MetaWord* BlockFreelist::get_block(size_t word_size) { 841 if (dictionary() == NULL) { 842 return NULL; 843 } 844 845 if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) { 846 // Dark matter. Too small for dictionary. 847 return NULL; 848 } 849 850 Metablock* free_block = 851 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast); 852 if (free_block == NULL) { 853 return NULL; 854 } 855 856 const size_t block_size = free_block->size(); 857 if (block_size > WasteMultiplier * word_size) { 858 return_block((MetaWord*)free_block, block_size); 859 return NULL; 860 } 861 862 MetaWord* new_block = (MetaWord*)free_block; 863 assert(block_size >= word_size, "Incorrect size of block from freelist"); 864 const size_t unused = block_size - word_size; 865 if (unused >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) { 866 return_block(new_block + word_size, unused); 867 } 868 869 return new_block; 870 } 871 872 void BlockFreelist::print_on(outputStream* st) const { 873 if (dictionary() == NULL) { 874 return; 875 } 876 dictionary()->print_free_lists(st); 877 } 878 879 // VirtualSpaceNode methods 880 881 VirtualSpaceNode::~VirtualSpaceNode() { 882 _rs.release(); 883 #ifdef ASSERT 884 size_t word_size = sizeof(*this) / BytesPerWord; 885 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1); 886 #endif 887 } 888 889 size_t VirtualSpaceNode::used_words_in_vs() const { 890 return pointer_delta(top(), bottom(), sizeof(MetaWord)); 891 } 892 893 // Space committed in the VirtualSpace 894 size_t VirtualSpaceNode::capacity_words_in_vs() const { 895 return pointer_delta(end(), bottom(), sizeof(MetaWord)); 896 } 897 898 size_t VirtualSpaceNode::free_words_in_vs() const { 899 return pointer_delta(end(), top(), sizeof(MetaWord)); 900 } 901 902 // Allocates the chunk from the virtual space only. 903 // This interface is also used internally for debugging. Not all 904 // chunks removed here are necessarily used for allocation. 905 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { 906 // Bottom of the new chunk 907 MetaWord* chunk_limit = top(); 908 assert(chunk_limit != NULL, "Not safe to call this method"); 909 910 // The virtual spaces are always expanded by the 911 // commit granularity to enforce the following condition. 912 // Without this the is_available check will not work correctly. 913 assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(), 914 "The committed memory doesn't match the expanded memory."); 915 916 if (!is_available(chunk_word_size)) { 917 if (TraceMetadataChunkAllocation) { 918 gclog_or_tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); 919 // Dump some information about the virtual space that is nearly full 920 print_on(gclog_or_tty); 921 } 922 return NULL; 923 } 924 925 // Take the space (bump top on the current virtual space). 926 inc_top(chunk_word_size); 927 928 // Initialize the chunk 929 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this); 930 return result; 931 } 932 933 934 // Expand the virtual space (commit more of the reserved space) 935 bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) { 936 size_t min_bytes = min_words * BytesPerWord; 937 size_t preferred_bytes = preferred_words * BytesPerWord; 938 939 size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size(); 940 941 if (uncommitted < min_bytes) { 942 return false; 943 } 944 945 size_t commit = MIN2(preferred_bytes, uncommitted); 946 bool result = virtual_space()->expand_by(commit, false); 947 948 assert(result, "Failed to commit memory"); 949 950 return result; 951 } 952 953 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { 954 assert_lock_strong(SpaceManager::expand_lock()); 955 Metachunk* result = take_from_committed(chunk_word_size); 956 if (result != NULL) { 957 inc_container_count(); 958 } 959 return result; 960 } 961 962 bool VirtualSpaceNode::initialize() { 963 964 if (!_rs.is_reserved()) { 965 return false; 966 } 967 968 // These are necessary restriction to make sure that the virtual space always 969 // grows in steps of Metaspace::commit_alignment(). If both base and size are 970 // aligned only the middle alignment of the VirtualSpace is used. 971 assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment()); 972 assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment()); 973 974 // ReservedSpaces marked as special will have the entire memory 975 // pre-committed. Setting a committed size will make sure that 976 // committed_size and actual_committed_size agrees. 977 size_t pre_committed_size = _rs.special() ? _rs.size() : 0; 978 979 bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size, 980 Metaspace::commit_alignment()); 981 if (result) { 982 assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(), 983 "Checking that the pre-committed memory was registered by the VirtualSpace"); 984 985 set_top((MetaWord*)virtual_space()->low()); 986 set_reserved(MemRegion((HeapWord*)_rs.base(), 987 (HeapWord*)(_rs.base() + _rs.size()))); 988 989 assert(reserved()->start() == (HeapWord*) _rs.base(), 990 err_msg("Reserved start was not set properly " PTR_FORMAT 991 " != " PTR_FORMAT, reserved()->start(), _rs.base())); 992 assert(reserved()->word_size() == _rs.size() / BytesPerWord, 993 err_msg("Reserved size was not set properly " SIZE_FORMAT 994 " != " SIZE_FORMAT, reserved()->word_size(), 995 _rs.size() / BytesPerWord)); 996 } 997 998 return result; 999 } 1000 1001 void VirtualSpaceNode::print_on(outputStream* st) const { 1002 size_t used = used_words_in_vs(); 1003 size_t capacity = capacity_words_in_vs(); 1004 VirtualSpace* vs = virtual_space(); 1005 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " 1006 "[" PTR_FORMAT ", " PTR_FORMAT ", " 1007 PTR_FORMAT ", " PTR_FORMAT ")", 1008 vs, capacity / K, 1009 capacity == 0 ? 0 : used * 100 / capacity, 1010 bottom(), top(), end(), 1011 vs->high_boundary()); 1012 } 1013 1014 #ifdef ASSERT 1015 void VirtualSpaceNode::mangle() { 1016 size_t word_size = capacity_words_in_vs(); 1017 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); 1018 } 1019 #endif // ASSERT 1020 1021 // VirtualSpaceList methods 1022 // Space allocated from the VirtualSpace 1023 1024 VirtualSpaceList::~VirtualSpaceList() { 1025 VirtualSpaceListIterator iter(virtual_space_list()); 1026 while (iter.repeat()) { 1027 VirtualSpaceNode* vsl = iter.get_next(); 1028 delete vsl; 1029 } 1030 } 1031 1032 void VirtualSpaceList::inc_reserved_words(size_t v) { 1033 assert_lock_strong(SpaceManager::expand_lock()); 1034 _reserved_words = _reserved_words + v; 1035 } 1036 void VirtualSpaceList::dec_reserved_words(size_t v) { 1037 assert_lock_strong(SpaceManager::expand_lock()); 1038 _reserved_words = _reserved_words - v; 1039 } 1040 1041 #define assert_committed_below_limit() \ 1042 assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize, \ 1043 err_msg("Too much committed memory. Committed: " SIZE_FORMAT \ 1044 " limit (MaxMetaspaceSize): " SIZE_FORMAT, \ 1045 MetaspaceAux::committed_bytes(), MaxMetaspaceSize)); 1046 1047 void VirtualSpaceList::inc_committed_words(size_t v) { 1048 assert_lock_strong(SpaceManager::expand_lock()); 1049 _committed_words = _committed_words + v; 1050 1051 assert_committed_below_limit(); 1052 } 1053 void VirtualSpaceList::dec_committed_words(size_t v) { 1054 assert_lock_strong(SpaceManager::expand_lock()); 1055 _committed_words = _committed_words - v; 1056 1057 assert_committed_below_limit(); 1058 } 1059 1060 void VirtualSpaceList::inc_virtual_space_count() { 1061 assert_lock_strong(SpaceManager::expand_lock()); 1062 _virtual_space_count++; 1063 } 1064 void VirtualSpaceList::dec_virtual_space_count() { 1065 assert_lock_strong(SpaceManager::expand_lock()); 1066 _virtual_space_count--; 1067 } 1068 1069 void ChunkManager::remove_chunk(Metachunk* chunk) { 1070 size_t word_size = chunk->word_size(); 1071 ChunkIndex index = list_index(word_size); 1072 if (index != HumongousIndex) { 1073 free_chunks(index)->remove_chunk(chunk); 1074 } else { 1075 humongous_dictionary()->remove_chunk(chunk); 1076 } 1077 1078 // Chunk is being removed from the chunks free list. 1079 dec_free_chunks_total(chunk->word_size()); 1080 } 1081 1082 // Walk the list of VirtualSpaceNodes and delete 1083 // nodes with a 0 container_count. Remove Metachunks in 1084 // the node from their respective freelists. 1085 void VirtualSpaceList::purge(ChunkManager* chunk_manager) { 1086 assert(SafepointSynchronize::is_at_safepoint(), "must be called at safepoint for contains to work"); 1087 assert_lock_strong(SpaceManager::expand_lock()); 1088 // Don't use a VirtualSpaceListIterator because this 1089 // list is being changed and a straightforward use of an iterator is not safe. 1090 VirtualSpaceNode* purged_vsl = NULL; 1091 VirtualSpaceNode* prev_vsl = virtual_space_list(); 1092 VirtualSpaceNode* next_vsl = prev_vsl; 1093 while (next_vsl != NULL) { 1094 VirtualSpaceNode* vsl = next_vsl; 1095 next_vsl = vsl->next(); 1096 // Don't free the current virtual space since it will likely 1097 // be needed soon. 1098 if (vsl->container_count() == 0 && vsl != current_virtual_space()) { 1099 // Unlink it from the list 1100 if (prev_vsl == vsl) { 1101 // This is the case of the current node being the first node. 1102 assert(vsl == virtual_space_list(), "Expected to be the first node"); 1103 set_virtual_space_list(vsl->next()); 1104 } else { 1105 prev_vsl->set_next(vsl->next()); 1106 } 1107 1108 vsl->purge(chunk_manager); 1109 dec_reserved_words(vsl->reserved_words()); 1110 dec_committed_words(vsl->committed_words()); 1111 dec_virtual_space_count(); 1112 purged_vsl = vsl; 1113 delete vsl; 1114 } else { 1115 prev_vsl = vsl; 1116 } 1117 } 1118 #ifdef ASSERT 1119 if (purged_vsl != NULL) { 1120 // List should be stable enough to use an iterator here. 1121 VirtualSpaceListIterator iter(virtual_space_list()); 1122 while (iter.repeat()) { 1123 VirtualSpaceNode* vsl = iter.get_next(); 1124 assert(vsl != purged_vsl, "Purge of vsl failed"); 1125 } 1126 } 1127 #endif 1128 } 1129 1130 1131 // This function looks at the mmap regions in the metaspace without locking. 1132 // The chunks are added with store ordering and not deleted except for at 1133 // unloading time during a safepoint. 1134 bool VirtualSpaceList::contains(const void* ptr) { 1135 // List should be stable enough to use an iterator here because removing virtual 1136 // space nodes is only allowed at a safepoint. 1137 VirtualSpaceListIterator iter(virtual_space_list()); 1138 while (iter.repeat()) { 1139 VirtualSpaceNode* vsn = iter.get_next(); 1140 if (vsn->contains(ptr)) { 1141 return true; 1142 } 1143 } 1144 return false; 1145 } 1146 1147 void VirtualSpaceList::retire_current_virtual_space() { 1148 assert_lock_strong(SpaceManager::expand_lock()); 1149 1150 VirtualSpaceNode* vsn = current_virtual_space(); 1151 1152 ChunkManager* cm = is_class() ? Metaspace::chunk_manager_class() : 1153 Metaspace::chunk_manager_metadata(); 1154 1155 vsn->retire(cm); 1156 } 1157 1158 void VirtualSpaceNode::retire(ChunkManager* chunk_manager) { 1159 for (int i = (int)MediumIndex; i >= (int)ZeroIndex; --i) { 1160 ChunkIndex index = (ChunkIndex)i; 1161 size_t chunk_size = chunk_manager->free_chunks(index)->size(); 1162 1163 while (free_words_in_vs() >= chunk_size) { 1164 DEBUG_ONLY(verify_container_count();) 1165 Metachunk* chunk = get_chunk_vs(chunk_size); 1166 assert(chunk != NULL, "allocation should have been successful"); 1167 1168 chunk_manager->return_chunks(index, chunk); 1169 chunk_manager->inc_free_chunks_total(chunk_size); 1170 DEBUG_ONLY(verify_container_count();) 1171 } 1172 } 1173 assert(free_words_in_vs() == 0, "should be empty now"); 1174 } 1175 1176 VirtualSpaceList::VirtualSpaceList(size_t word_size) : 1177 _is_class(false), 1178 _virtual_space_list(NULL), 1179 _current_virtual_space(NULL), 1180 _reserved_words(0), 1181 _committed_words(0), 1182 _virtual_space_count(0) { 1183 MutexLockerEx cl(SpaceManager::expand_lock(), 1184 Mutex::_no_safepoint_check_flag); 1185 create_new_virtual_space(word_size); 1186 } 1187 1188 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : 1189 _is_class(true), 1190 _virtual_space_list(NULL), 1191 _current_virtual_space(NULL), 1192 _reserved_words(0), 1193 _committed_words(0), 1194 _virtual_space_count(0) { 1195 MutexLockerEx cl(SpaceManager::expand_lock(), 1196 Mutex::_no_safepoint_check_flag); 1197 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); 1198 bool succeeded = class_entry->initialize(); 1199 if (succeeded) { 1200 link_vs(class_entry); 1201 } 1202 } 1203 1204 size_t VirtualSpaceList::free_bytes() { 1205 return virtual_space_list()->free_words_in_vs() * BytesPerWord; 1206 } 1207 1208 // Allocate another meta virtual space and add it to the list. 1209 bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) { 1210 assert_lock_strong(SpaceManager::expand_lock()); 1211 1212 if (is_class()) { 1213 assert(false, "We currently don't support more than one VirtualSpace for" 1214 " the compressed class space. The initialization of the" 1215 " CCS uses another code path and should not hit this path."); 1216 return false; 1217 } 1218 1219 if (vs_word_size == 0) { 1220 assert(false, "vs_word_size should always be at least _reserve_alignment large."); 1221 return false; 1222 } 1223 1224 // Reserve the space 1225 size_t vs_byte_size = vs_word_size * BytesPerWord; 1226 assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment()); 1227 1228 // Allocate the meta virtual space and initialize it. 1229 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); 1230 if (!new_entry->initialize()) { 1231 delete new_entry; 1232 return false; 1233 } else { 1234 assert(new_entry->reserved_words() == vs_word_size, 1235 "Reserved memory size differs from requested memory size"); 1236 // ensure lock-free iteration sees fully initialized node 1237 OrderAccess::storestore(); 1238 link_vs(new_entry); 1239 return true; 1240 } 1241 } 1242 1243 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) { 1244 if (virtual_space_list() == NULL) { 1245 set_virtual_space_list(new_entry); 1246 } else { 1247 current_virtual_space()->set_next(new_entry); 1248 } 1249 set_current_virtual_space(new_entry); 1250 inc_reserved_words(new_entry->reserved_words()); 1251 inc_committed_words(new_entry->committed_words()); 1252 inc_virtual_space_count(); 1253 #ifdef ASSERT 1254 new_entry->mangle(); 1255 #endif 1256 if (TraceMetavirtualspaceAllocation && Verbose) { 1257 VirtualSpaceNode* vsl = current_virtual_space(); 1258 vsl->print_on(gclog_or_tty); 1259 } 1260 } 1261 1262 bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node, 1263 size_t min_words, 1264 size_t preferred_words) { 1265 size_t before = node->committed_words(); 1266 1267 bool result = node->expand_by(min_words, preferred_words); 1268 1269 size_t after = node->committed_words(); 1270 1271 // after and before can be the same if the memory was pre-committed. 1272 assert(after >= before, "Inconsistency"); 1273 inc_committed_words(after - before); 1274 1275 return result; 1276 } 1277 1278 bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) { 1279 assert_is_size_aligned(min_words, Metaspace::commit_alignment_words()); 1280 assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words()); 1281 assert(min_words <= preferred_words, "Invalid arguments"); 1282 1283 if (!MetaspaceGC::can_expand(min_words, this->is_class())) { 1284 return false; 1285 } 1286 1287 size_t allowed_expansion_words = MetaspaceGC::allowed_expansion(); 1288 if (allowed_expansion_words < min_words) { 1289 return false; 1290 } 1291 1292 size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words); 1293 1294 // Commit more memory from the the current virtual space. 1295 bool vs_expanded = expand_node_by(current_virtual_space(), 1296 min_words, 1297 max_expansion_words); 1298 if (vs_expanded) { 1299 return true; 1300 } 1301 retire_current_virtual_space(); 1302 1303 // Get another virtual space. 1304 size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words); 1305 grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words()); 1306 1307 if (create_new_virtual_space(grow_vs_words)) { 1308 if (current_virtual_space()->is_pre_committed()) { 1309 // The memory was pre-committed, so we are done here. 1310 assert(min_words <= current_virtual_space()->committed_words(), 1311 "The new VirtualSpace was pre-committed, so it" 1312 "should be large enough to fit the alloc request."); 1313 return true; 1314 } 1315 1316 return expand_node_by(current_virtual_space(), 1317 min_words, 1318 max_expansion_words); 1319 } 1320 1321 return false; 1322 } 1323 1324 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, 1325 size_t grow_chunks_by_words, 1326 size_t medium_chunk_bunch) { 1327 1328 // Allocate a chunk out of the current virtual space. 1329 Metachunk* next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); 1330 1331 if (next != NULL) { 1332 return next; 1333 } 1334 1335 // The expand amount is currently only determined by the requested sizes 1336 // and not how much committed memory is left in the current virtual space. 1337 1338 size_t min_word_size = align_size_up(grow_chunks_by_words, Metaspace::commit_alignment_words()); 1339 size_t preferred_word_size = align_size_up(medium_chunk_bunch, Metaspace::commit_alignment_words()); 1340 if (min_word_size >= preferred_word_size) { 1341 // Can happen when humongous chunks are allocated. 1342 preferred_word_size = min_word_size; 1343 } 1344 1345 bool expanded = expand_by(min_word_size, preferred_word_size); 1346 if (expanded) { 1347 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); 1348 assert(next != NULL, "The allocation was expected to succeed after the expansion"); 1349 } 1350 1351 return next; 1352 } 1353 1354 void VirtualSpaceList::print_on(outputStream* st) const { 1355 if (TraceMetadataChunkAllocation && Verbose) { 1356 VirtualSpaceListIterator iter(virtual_space_list()); 1357 while (iter.repeat()) { 1358 VirtualSpaceNode* node = iter.get_next(); 1359 node->print_on(st); 1360 } 1361 } 1362 } 1363 1364 // MetaspaceGC methods 1365 1366 // VM_CollectForMetadataAllocation is the vm operation used to GC. 1367 // Within the VM operation after the GC the attempt to allocate the metadata 1368 // should succeed. If the GC did not free enough space for the metaspace 1369 // allocation, the HWM is increased so that another virtualspace will be 1370 // allocated for the metadata. With perm gen the increase in the perm 1371 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The 1372 // metaspace policy uses those as the small and large steps for the HWM. 1373 // 1374 // After the GC the compute_new_size() for MetaspaceGC is called to 1375 // resize the capacity of the metaspaces. The current implementation 1376 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used 1377 // to resize the Java heap by some GC's. New flags can be implemented 1378 // if really needed. MinMetaspaceFreeRatio is used to calculate how much 1379 // free space is desirable in the metaspace capacity to decide how much 1380 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much 1381 // free space is desirable in the metaspace capacity before decreasing 1382 // the HWM. 1383 1384 // Calculate the amount to increase the high water mark (HWM). 1385 // Increase by a minimum amount (MinMetaspaceExpansion) so that 1386 // another expansion is not requested too soon. If that is not 1387 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion. 1388 // If that is still not enough, expand by the size of the allocation 1389 // plus some. 1390 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) { 1391 size_t min_delta = MinMetaspaceExpansion; 1392 size_t max_delta = MaxMetaspaceExpansion; 1393 size_t delta = align_size_up(bytes, Metaspace::commit_alignment()); 1394 1395 if (delta <= min_delta) { 1396 delta = min_delta; 1397 } else if (delta <= max_delta) { 1398 // Don't want to hit the high water mark on the next 1399 // allocation so make the delta greater than just enough 1400 // for this allocation. 1401 delta = max_delta; 1402 } else { 1403 // This allocation is large but the next ones are probably not 1404 // so increase by the minimum. 1405 delta = delta + min_delta; 1406 } 1407 1408 assert_is_size_aligned(delta, Metaspace::commit_alignment()); 1409 1410 return delta; 1411 } 1412 1413 size_t MetaspaceGC::capacity_until_GC() { 1414 size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC); 1415 assert(value >= MetaspaceSize, "Not initialized properly?"); 1416 return value; 1417 } 1418 1419 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) { 1420 assert_is_size_aligned(v, Metaspace::commit_alignment()); 1421 1422 size_t capacity_until_GC = (size_t) _capacity_until_GC; 1423 size_t new_value = capacity_until_GC + v; 1424 1425 if (new_value < capacity_until_GC) { 1426 // The addition wrapped around, set new_value to aligned max value. 1427 new_value = align_size_down(max_uintx, Metaspace::commit_alignment()); 1428 } 1429 1430 intptr_t expected = (intptr_t) capacity_until_GC; 1431 intptr_t actual = Atomic::cmpxchg_ptr((intptr_t) new_value, &_capacity_until_GC, expected); 1432 1433 if (expected != actual) { 1434 return false; 1435 } 1436 1437 if (new_cap_until_GC != NULL) { 1438 *new_cap_until_GC = new_value; 1439 } 1440 if (old_cap_until_GC != NULL) { 1441 *old_cap_until_GC = capacity_until_GC; 1442 } 1443 return true; 1444 } 1445 1446 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) { 1447 assert_is_size_aligned(v, Metaspace::commit_alignment()); 1448 1449 return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC); 1450 } 1451 1452 void MetaspaceGC::initialize() { 1453 // Set the high-water mark to MaxMetapaceSize during VM initializaton since 1454 // we can't do a GC during initialization. 1455 _capacity_until_GC = MaxMetaspaceSize; 1456 } 1457 1458 void MetaspaceGC::post_initialize() { 1459 // Reset the high-water mark once the VM initialization is done. 1460 _capacity_until_GC = MAX2(MetaspaceAux::committed_bytes(), MetaspaceSize); 1461 } 1462 1463 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) { 1464 // Check if the compressed class space is full. 1465 if (is_class && Metaspace::using_class_space()) { 1466 size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType); 1467 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) { 1468 return false; 1469 } 1470 } 1471 1472 // Check if the user has imposed a limit on the metaspace memory. 1473 size_t committed_bytes = MetaspaceAux::committed_bytes(); 1474 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) { 1475 return false; 1476 } 1477 1478 return true; 1479 } 1480 1481 size_t MetaspaceGC::allowed_expansion() { 1482 size_t committed_bytes = MetaspaceAux::committed_bytes(); 1483 size_t capacity_until_gc = capacity_until_GC(); 1484 1485 assert(capacity_until_gc >= committed_bytes, 1486 err_msg("capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT, 1487 capacity_until_gc, committed_bytes)); 1488 1489 size_t left_until_max = MaxMetaspaceSize - committed_bytes; 1490 size_t left_until_GC = capacity_until_gc - committed_bytes; 1491 size_t left_to_commit = MIN2(left_until_GC, left_until_max); 1492 1493 return left_to_commit / BytesPerWord; 1494 } 1495 1496 void MetaspaceGC::compute_new_size() { 1497 assert(_shrink_factor <= 100, "invalid shrink factor"); 1498 uint current_shrink_factor = _shrink_factor; 1499 _shrink_factor = 0; 1500 1501 // Using committed_bytes() for used_after_gc is an overestimation, since the 1502 // chunk free lists are included in committed_bytes() and the memory in an 1503 // un-fragmented chunk free list is available for future allocations. 1504 // However, if the chunk free lists becomes fragmented, then the memory may 1505 // not be available for future allocations and the memory is therefore "in use". 1506 // Including the chunk free lists in the definition of "in use" is therefore 1507 // necessary. Not including the chunk free lists can cause capacity_until_GC to 1508 // shrink below committed_bytes() and this has caused serious bugs in the past. 1509 const size_t used_after_gc = MetaspaceAux::committed_bytes(); 1510 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC(); 1511 1512 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; 1513 const double maximum_used_percentage = 1.0 - minimum_free_percentage; 1514 1515 const double min_tmp = used_after_gc / maximum_used_percentage; 1516 size_t minimum_desired_capacity = 1517 (size_t)MIN2(min_tmp, double(max_uintx)); 1518 // Don't shrink less than the initial generation size 1519 minimum_desired_capacity = MAX2(minimum_desired_capacity, 1520 MetaspaceSize); 1521 1522 if (PrintGCDetails && Verbose) { 1523 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); 1524 gclog_or_tty->print_cr(" " 1525 " minimum_free_percentage: %6.2f" 1526 " maximum_used_percentage: %6.2f", 1527 minimum_free_percentage, 1528 maximum_used_percentage); 1529 gclog_or_tty->print_cr(" " 1530 " used_after_gc : %6.1fKB", 1531 used_after_gc / (double) K); 1532 } 1533 1534 1535 size_t shrink_bytes = 0; 1536 if (capacity_until_GC < minimum_desired_capacity) { 1537 // If we have less capacity below the metaspace HWM, then 1538 // increment the HWM. 1539 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; 1540 expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment()); 1541 // Don't expand unless it's significant 1542 if (expand_bytes >= MinMetaspaceExpansion) { 1543 size_t new_capacity_until_GC = 0; 1544 bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC); 1545 assert(succeeded, "Should always succesfully increment HWM when at safepoint"); 1546 1547 Metaspace::tracer()->report_gc_threshold(capacity_until_GC, 1548 new_capacity_until_GC, 1549 MetaspaceGCThresholdUpdater::ComputeNewSize); 1550 if (PrintGCDetails && Verbose) { 1551 gclog_or_tty->print_cr(" expanding:" 1552 " minimum_desired_capacity: %6.1fKB" 1553 " expand_bytes: %6.1fKB" 1554 " MinMetaspaceExpansion: %6.1fKB" 1555 " new metaspace HWM: %6.1fKB", 1556 minimum_desired_capacity / (double) K, 1557 expand_bytes / (double) K, 1558 MinMetaspaceExpansion / (double) K, 1559 new_capacity_until_GC / (double) K); 1560 } 1561 } 1562 return; 1563 } 1564 1565 // No expansion, now see if we want to shrink 1566 // We would never want to shrink more than this 1567 assert(capacity_until_GC >= minimum_desired_capacity, 1568 err_msg(SIZE_FORMAT " >= " SIZE_FORMAT, 1569 capacity_until_GC, minimum_desired_capacity)); 1570 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity; 1571 1572 // Should shrinking be considered? 1573 if (MaxMetaspaceFreeRatio < 100) { 1574 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; 1575 const double minimum_used_percentage = 1.0 - maximum_free_percentage; 1576 const double max_tmp = used_after_gc / minimum_used_percentage; 1577 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); 1578 maximum_desired_capacity = MAX2(maximum_desired_capacity, 1579 MetaspaceSize); 1580 if (PrintGCDetails && Verbose) { 1581 gclog_or_tty->print_cr(" " 1582 " maximum_free_percentage: %6.2f" 1583 " minimum_used_percentage: %6.2f", 1584 maximum_free_percentage, 1585 minimum_used_percentage); 1586 gclog_or_tty->print_cr(" " 1587 " minimum_desired_capacity: %6.1fKB" 1588 " maximum_desired_capacity: %6.1fKB", 1589 minimum_desired_capacity / (double) K, 1590 maximum_desired_capacity / (double) K); 1591 } 1592 1593 assert(minimum_desired_capacity <= maximum_desired_capacity, 1594 "sanity check"); 1595 1596 if (capacity_until_GC > maximum_desired_capacity) { 1597 // Capacity too large, compute shrinking size 1598 shrink_bytes = capacity_until_GC - maximum_desired_capacity; 1599 // We don't want shrink all the way back to initSize if people call 1600 // System.gc(), because some programs do that between "phases" and then 1601 // we'd just have to grow the heap up again for the next phase. So we 1602 // damp the shrinking: 0% on the first call, 10% on the second call, 40% 1603 // on the third call, and 100% by the fourth call. But if we recompute 1604 // size without shrinking, it goes back to 0%. 1605 shrink_bytes = shrink_bytes / 100 * current_shrink_factor; 1606 1607 shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment()); 1608 1609 assert(shrink_bytes <= max_shrink_bytes, 1610 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, 1611 shrink_bytes, max_shrink_bytes)); 1612 if (current_shrink_factor == 0) { 1613 _shrink_factor = 10; 1614 } else { 1615 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); 1616 } 1617 if (PrintGCDetails && Verbose) { 1618 gclog_or_tty->print_cr(" " 1619 " shrinking:" 1620 " initSize: %.1fK" 1621 " maximum_desired_capacity: %.1fK", 1622 MetaspaceSize / (double) K, 1623 maximum_desired_capacity / (double) K); 1624 gclog_or_tty->print_cr(" " 1625 " shrink_bytes: %.1fK" 1626 " current_shrink_factor: %d" 1627 " new shrink factor: %d" 1628 " MinMetaspaceExpansion: %.1fK", 1629 shrink_bytes / (double) K, 1630 current_shrink_factor, 1631 _shrink_factor, 1632 MinMetaspaceExpansion / (double) K); 1633 } 1634 } 1635 } 1636 1637 // Don't shrink unless it's significant 1638 if (shrink_bytes >= MinMetaspaceExpansion && 1639 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) { 1640 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes); 1641 Metaspace::tracer()->report_gc_threshold(capacity_until_GC, 1642 new_capacity_until_GC, 1643 MetaspaceGCThresholdUpdater::ComputeNewSize); 1644 } 1645 } 1646 1647 // Metadebug methods 1648 1649 void Metadebug::init_allocation_fail_alot_count() { 1650 if (MetadataAllocationFailALot) { 1651 _allocation_fail_alot_count = 1652 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); 1653 } 1654 } 1655 1656 #ifdef ASSERT 1657 bool Metadebug::test_metadata_failure() { 1658 if (MetadataAllocationFailALot && 1659 Threads::is_vm_complete()) { 1660 if (_allocation_fail_alot_count > 0) { 1661 _allocation_fail_alot_count--; 1662 } else { 1663 if (TraceMetadataChunkAllocation && Verbose) { 1664 gclog_or_tty->print_cr("Metadata allocation failing for " 1665 "MetadataAllocationFailALot"); 1666 } 1667 init_allocation_fail_alot_count(); 1668 return true; 1669 } 1670 } 1671 return false; 1672 } 1673 #endif 1674 1675 // ChunkManager methods 1676 1677 size_t ChunkManager::free_chunks_total_words() { 1678 return _free_chunks_total; 1679 } 1680 1681 size_t ChunkManager::free_chunks_total_bytes() { 1682 return free_chunks_total_words() * BytesPerWord; 1683 } 1684 1685 size_t ChunkManager::free_chunks_count() { 1686 #ifdef ASSERT 1687 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { 1688 MutexLockerEx cl(SpaceManager::expand_lock(), 1689 Mutex::_no_safepoint_check_flag); 1690 // This lock is only needed in debug because the verification 1691 // of the _free_chunks_totals walks the list of free chunks 1692 slow_locked_verify_free_chunks_count(); 1693 } 1694 #endif 1695 return _free_chunks_count; 1696 } 1697 1698 void ChunkManager::locked_verify_free_chunks_total() { 1699 assert_lock_strong(SpaceManager::expand_lock()); 1700 assert(sum_free_chunks() == _free_chunks_total, 1701 err_msg("_free_chunks_total " SIZE_FORMAT " is not the" 1702 " same as sum " SIZE_FORMAT, _free_chunks_total, 1703 sum_free_chunks())); 1704 } 1705 1706 void ChunkManager::verify_free_chunks_total() { 1707 MutexLockerEx cl(SpaceManager::expand_lock(), 1708 Mutex::_no_safepoint_check_flag); 1709 locked_verify_free_chunks_total(); 1710 } 1711 1712 void ChunkManager::locked_verify_free_chunks_count() { 1713 assert_lock_strong(SpaceManager::expand_lock()); 1714 assert(sum_free_chunks_count() == _free_chunks_count, 1715 err_msg("_free_chunks_count " SIZE_FORMAT " is not the" 1716 " same as sum " SIZE_FORMAT, _free_chunks_count, 1717 sum_free_chunks_count())); 1718 } 1719 1720 void ChunkManager::verify_free_chunks_count() { 1721 #ifdef ASSERT 1722 MutexLockerEx cl(SpaceManager::expand_lock(), 1723 Mutex::_no_safepoint_check_flag); 1724 locked_verify_free_chunks_count(); 1725 #endif 1726 } 1727 1728 void ChunkManager::verify() { 1729 MutexLockerEx cl(SpaceManager::expand_lock(), 1730 Mutex::_no_safepoint_check_flag); 1731 locked_verify(); 1732 } 1733 1734 void ChunkManager::locked_verify() { 1735 locked_verify_free_chunks_count(); 1736 locked_verify_free_chunks_total(); 1737 } 1738 1739 void ChunkManager::locked_print_free_chunks(outputStream* st) { 1740 assert_lock_strong(SpaceManager::expand_lock()); 1741 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, 1742 _free_chunks_total, _free_chunks_count); 1743 } 1744 1745 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { 1746 assert_lock_strong(SpaceManager::expand_lock()); 1747 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, 1748 sum_free_chunks(), sum_free_chunks_count()); 1749 } 1750 ChunkList* ChunkManager::free_chunks(ChunkIndex index) { 1751 return &_free_chunks[index]; 1752 } 1753 1754 // These methods that sum the free chunk lists are used in printing 1755 // methods that are used in product builds. 1756 size_t ChunkManager::sum_free_chunks() { 1757 assert_lock_strong(SpaceManager::expand_lock()); 1758 size_t result = 0; 1759 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { 1760 ChunkList* list = free_chunks(i); 1761 1762 if (list == NULL) { 1763 continue; 1764 } 1765 1766 result = result + list->count() * list->size(); 1767 } 1768 result = result + humongous_dictionary()->total_size(); 1769 return result; 1770 } 1771 1772 size_t ChunkManager::sum_free_chunks_count() { 1773 assert_lock_strong(SpaceManager::expand_lock()); 1774 size_t count = 0; 1775 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { 1776 ChunkList* list = free_chunks(i); 1777 if (list == NULL) { 1778 continue; 1779 } 1780 count = count + list->count(); 1781 } 1782 count = count + humongous_dictionary()->total_free_blocks(); 1783 return count; 1784 } 1785 1786 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { 1787 ChunkIndex index = list_index(word_size); 1788 assert(index < HumongousIndex, "No humongous list"); 1789 return free_chunks(index); 1790 } 1791 1792 Metachunk* ChunkManager::free_chunks_get(size_t word_size) { 1793 assert_lock_strong(SpaceManager::expand_lock()); 1794 1795 slow_locked_verify(); 1796 1797 Metachunk* chunk = NULL; 1798 if (list_index(word_size) != HumongousIndex) { 1799 ChunkList* free_list = find_free_chunks_list(word_size); 1800 assert(free_list != NULL, "Sanity check"); 1801 1802 chunk = free_list->head(); 1803 1804 if (chunk == NULL) { 1805 return NULL; 1806 } 1807 1808 // Remove the chunk as the head of the list. 1809 free_list->remove_chunk(chunk); 1810 1811 if (TraceMetadataChunkAllocation && Verbose) { 1812 gclog_or_tty->print_cr("ChunkManager::free_chunks_get: free_list " 1813 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, 1814 free_list, chunk, chunk->word_size()); 1815 } 1816 } else { 1817 chunk = humongous_dictionary()->get_chunk( 1818 word_size, 1819 FreeBlockDictionary<Metachunk>::atLeast); 1820 1821 if (chunk == NULL) { 1822 return NULL; 1823 } 1824 1825 if (TraceMetadataHumongousAllocation) { 1826 size_t waste = chunk->word_size() - word_size; 1827 gclog_or_tty->print_cr("Free list allocate humongous chunk size " 1828 SIZE_FORMAT " for requested size " SIZE_FORMAT 1829 " waste " SIZE_FORMAT, 1830 chunk->word_size(), word_size, waste); 1831 } 1832 } 1833 1834 // Chunk is being removed from the chunks free list. 1835 dec_free_chunks_total(chunk->word_size()); 1836 1837 // Remove it from the links to this freelist 1838 chunk->set_next(NULL); 1839 chunk->set_prev(NULL); 1840 #ifdef ASSERT 1841 // Chunk is no longer on any freelist. Setting to false make container_count_slow() 1842 // work. 1843 chunk->set_is_tagged_free(false); 1844 #endif 1845 chunk->container()->inc_container_count(); 1846 1847 slow_locked_verify(); 1848 return chunk; 1849 } 1850 1851 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { 1852 assert_lock_strong(SpaceManager::expand_lock()); 1853 slow_locked_verify(); 1854 1855 // Take from the beginning of the list 1856 Metachunk* chunk = free_chunks_get(word_size); 1857 if (chunk == NULL) { 1858 return NULL; 1859 } 1860 1861 assert((word_size <= chunk->word_size()) || 1862 list_index(chunk->word_size() == HumongousIndex), 1863 "Non-humongous variable sized chunk"); 1864 if (TraceMetadataChunkAllocation) { 1865 size_t list_count; 1866 if (list_index(word_size) < HumongousIndex) { 1867 ChunkList* list = find_free_chunks_list(word_size); 1868 list_count = list->count(); 1869 } else { 1870 list_count = humongous_dictionary()->total_count(); 1871 } 1872 gclog_or_tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk " 1873 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ", 1874 this, chunk, chunk->word_size(), list_count); 1875 locked_print_free_chunks(gclog_or_tty); 1876 } 1877 1878 return chunk; 1879 } 1880 1881 void ChunkManager::print_on(outputStream* out) const { 1882 if (PrintFLSStatistics != 0) { 1883 const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics(); 1884 } 1885 } 1886 1887 // SpaceManager methods 1888 1889 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type, 1890 size_t* chunk_word_size, 1891 size_t* class_chunk_word_size) { 1892 switch (type) { 1893 case Metaspace::BootMetaspaceType: 1894 *chunk_word_size = Metaspace::first_chunk_word_size(); 1895 *class_chunk_word_size = Metaspace::first_class_chunk_word_size(); 1896 break; 1897 case Metaspace::ROMetaspaceType: 1898 *chunk_word_size = SharedReadOnlySize / wordSize; 1899 *class_chunk_word_size = ClassSpecializedChunk; 1900 break; 1901 case Metaspace::ReadWriteMetaspaceType: 1902 *chunk_word_size = SharedReadWriteSize / wordSize; 1903 *class_chunk_word_size = ClassSpecializedChunk; 1904 break; 1905 case Metaspace::AnonymousMetaspaceType: 1906 case Metaspace::ReflectionMetaspaceType: 1907 *chunk_word_size = SpecializedChunk; 1908 *class_chunk_word_size = ClassSpecializedChunk; 1909 break; 1910 default: 1911 *chunk_word_size = SmallChunk; 1912 *class_chunk_word_size = ClassSmallChunk; 1913 break; 1914 } 1915 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0, 1916 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT 1917 " class " SIZE_FORMAT, 1918 *chunk_word_size, *class_chunk_word_size)); 1919 } 1920 1921 size_t SpaceManager::sum_free_in_chunks_in_use() const { 1922 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); 1923 size_t free = 0; 1924 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 1925 Metachunk* chunk = chunks_in_use(i); 1926 while (chunk != NULL) { 1927 free += chunk->free_word_size(); 1928 chunk = chunk->next(); 1929 } 1930 } 1931 return free; 1932 } 1933 1934 size_t SpaceManager::sum_waste_in_chunks_in_use() const { 1935 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); 1936 size_t result = 0; 1937 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 1938 result += sum_waste_in_chunks_in_use(i); 1939 } 1940 1941 return result; 1942 } 1943 1944 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { 1945 size_t result = 0; 1946 Metachunk* chunk = chunks_in_use(index); 1947 // Count the free space in all the chunk but not the 1948 // current chunk from which allocations are still being done. 1949 while (chunk != NULL) { 1950 if (chunk != current_chunk()) { 1951 result += chunk->free_word_size(); 1952 } 1953 chunk = chunk->next(); 1954 } 1955 return result; 1956 } 1957 1958 size_t SpaceManager::sum_capacity_in_chunks_in_use() const { 1959 // For CMS use "allocated_chunks_words()" which does not need the 1960 // Metaspace lock. For the other collectors sum over the 1961 // lists. Use both methods as a check that "allocated_chunks_words()" 1962 // is correct. That is, sum_capacity_in_chunks() is too expensive 1963 // to use in the product and allocated_chunks_words() should be used 1964 // but allow for checking that allocated_chunks_words() returns the same 1965 // value as sum_capacity_in_chunks_in_use() which is the definitive 1966 // answer. 1967 if (UseConcMarkSweepGC) { 1968 return allocated_chunks_words(); 1969 } else { 1970 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); 1971 size_t sum = 0; 1972 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 1973 Metachunk* chunk = chunks_in_use(i); 1974 while (chunk != NULL) { 1975 sum += chunk->word_size(); 1976 chunk = chunk->next(); 1977 } 1978 } 1979 return sum; 1980 } 1981 } 1982 1983 size_t SpaceManager::sum_count_in_chunks_in_use() { 1984 size_t count = 0; 1985 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 1986 count = count + sum_count_in_chunks_in_use(i); 1987 } 1988 1989 return count; 1990 } 1991 1992 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { 1993 size_t count = 0; 1994 Metachunk* chunk = chunks_in_use(i); 1995 while (chunk != NULL) { 1996 count++; 1997 chunk = chunk->next(); 1998 } 1999 return count; 2000 } 2001 2002 2003 size_t SpaceManager::sum_used_in_chunks_in_use() const { 2004 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); 2005 size_t used = 0; 2006 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 2007 Metachunk* chunk = chunks_in_use(i); 2008 while (chunk != NULL) { 2009 used += chunk->used_word_size(); 2010 chunk = chunk->next(); 2011 } 2012 } 2013 return used; 2014 } 2015 2016 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { 2017 2018 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 2019 Metachunk* chunk = chunks_in_use(i); 2020 st->print("SpaceManager: %s " PTR_FORMAT, 2021 chunk_size_name(i), chunk); 2022 if (chunk != NULL) { 2023 st->print_cr(" free " SIZE_FORMAT, 2024 chunk->free_word_size()); 2025 } else { 2026 st->cr(); 2027 } 2028 } 2029 2030 chunk_manager()->locked_print_free_chunks(st); 2031 chunk_manager()->locked_print_sum_free_chunks(st); 2032 } 2033 2034 size_t SpaceManager::calc_chunk_size(size_t word_size) { 2035 2036 // Decide between a small chunk and a medium chunk. Up to 2037 // _small_chunk_limit small chunks can be allocated but 2038 // once a medium chunk has been allocated, no more small 2039 // chunks will be allocated. 2040 size_t chunk_word_size; 2041 if (chunks_in_use(MediumIndex) == NULL && 2042 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) { 2043 chunk_word_size = (size_t) small_chunk_size(); 2044 if (word_size + Metachunk::overhead() > small_chunk_size()) { 2045 chunk_word_size = medium_chunk_size(); 2046 } 2047 } else { 2048 chunk_word_size = medium_chunk_size(); 2049 } 2050 2051 // Might still need a humongous chunk. Enforce 2052 // humongous allocations sizes to be aligned up to 2053 // the smallest chunk size. 2054 size_t if_humongous_sized_chunk = 2055 align_size_up(word_size + Metachunk::overhead(), 2056 smallest_chunk_size()); 2057 chunk_word_size = 2058 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk); 2059 2060 assert(!SpaceManager::is_humongous(word_size) || 2061 chunk_word_size == if_humongous_sized_chunk, 2062 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT 2063 " chunk_word_size " SIZE_FORMAT, 2064 word_size, chunk_word_size)); 2065 if (TraceMetadataHumongousAllocation && 2066 SpaceManager::is_humongous(word_size)) { 2067 gclog_or_tty->print_cr("Metadata humongous allocation:"); 2068 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); 2069 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, 2070 chunk_word_size); 2071 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT, 2072 Metachunk::overhead()); 2073 } 2074 return chunk_word_size; 2075 } 2076 2077 void SpaceManager::track_metaspace_memory_usage() { 2078 if (is_init_completed()) { 2079 if (is_class()) { 2080 MemoryService::track_compressed_class_memory_usage(); 2081 } 2082 MemoryService::track_metaspace_memory_usage(); 2083 } 2084 } 2085 2086 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { 2087 assert(vs_list()->current_virtual_space() != NULL, 2088 "Should have been set"); 2089 assert(current_chunk() == NULL || 2090 current_chunk()->allocate(word_size) == NULL, 2091 "Don't need to expand"); 2092 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); 2093 2094 if (TraceMetadataChunkAllocation && Verbose) { 2095 size_t words_left = 0; 2096 size_t words_used = 0; 2097 if (current_chunk() != NULL) { 2098 words_left = current_chunk()->free_word_size(); 2099 words_used = current_chunk()->used_word_size(); 2100 } 2101 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT 2102 " words " SIZE_FORMAT " words used " SIZE_FORMAT 2103 " words left", 2104 word_size, words_used, words_left); 2105 } 2106 2107 // Get another chunk out of the virtual space 2108 size_t grow_chunks_by_words = calc_chunk_size(word_size); 2109 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words); 2110 2111 MetaWord* mem = NULL; 2112 2113 // If a chunk was available, add it to the in-use chunk list 2114 // and do an allocation from it. 2115 if (next != NULL) { 2116 // Add to this manager's list of chunks in use. 2117 add_chunk(next, false); 2118 mem = next->allocate(word_size); 2119 } 2120 2121 // Track metaspace memory usage statistic. 2122 track_metaspace_memory_usage(); 2123 2124 return mem; 2125 } 2126 2127 void SpaceManager::print_on(outputStream* st) const { 2128 2129 for (ChunkIndex i = ZeroIndex; 2130 i < NumberOfInUseLists ; 2131 i = next_chunk_index(i) ) { 2132 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, 2133 chunks_in_use(i), 2134 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); 2135 } 2136 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT 2137 " Humongous " SIZE_FORMAT, 2138 sum_waste_in_chunks_in_use(SmallIndex), 2139 sum_waste_in_chunks_in_use(MediumIndex), 2140 sum_waste_in_chunks_in_use(HumongousIndex)); 2141 // block free lists 2142 if (block_freelists() != NULL) { 2143 st->print_cr("total in block free lists " SIZE_FORMAT, 2144 block_freelists()->total_size()); 2145 } 2146 } 2147 2148 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype, 2149 Mutex* lock) : 2150 _mdtype(mdtype), 2151 _allocated_blocks_words(0), 2152 _allocated_chunks_words(0), 2153 _allocated_chunks_count(0), 2154 _lock(lock) 2155 { 2156 initialize(); 2157 } 2158 2159 void SpaceManager::inc_size_metrics(size_t words) { 2160 assert_lock_strong(SpaceManager::expand_lock()); 2161 // Total of allocated Metachunks and allocated Metachunks count 2162 // for each SpaceManager 2163 _allocated_chunks_words = _allocated_chunks_words + words; 2164 _allocated_chunks_count++; 2165 // Global total of capacity in allocated Metachunks 2166 MetaspaceAux::inc_capacity(mdtype(), words); 2167 // Global total of allocated Metablocks. 2168 // used_words_slow() includes the overhead in each 2169 // Metachunk so include it in the used when the 2170 // Metachunk is first added (so only added once per 2171 // Metachunk). 2172 MetaspaceAux::inc_used(mdtype(), Metachunk::overhead()); 2173 } 2174 2175 void SpaceManager::inc_used_metrics(size_t words) { 2176 // Add to the per SpaceManager total 2177 Atomic::add_ptr(words, &_allocated_blocks_words); 2178 // Add to the global total 2179 MetaspaceAux::inc_used(mdtype(), words); 2180 } 2181 2182 void SpaceManager::dec_total_from_size_metrics() { 2183 MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words()); 2184 MetaspaceAux::dec_used(mdtype(), allocated_blocks_words()); 2185 // Also deduct the overhead per Metachunk 2186 MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead()); 2187 } 2188 2189 void SpaceManager::initialize() { 2190 Metadebug::init_allocation_fail_alot_count(); 2191 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 2192 _chunks_in_use[i] = NULL; 2193 } 2194 _current_chunk = NULL; 2195 if (TraceMetadataChunkAllocation && Verbose) { 2196 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); 2197 } 2198 } 2199 2200 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) { 2201 if (chunks == NULL) { 2202 return; 2203 } 2204 ChunkList* list = free_chunks(index); 2205 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes"); 2206 assert_lock_strong(SpaceManager::expand_lock()); 2207 Metachunk* cur = chunks; 2208 2209 // This returns chunks one at a time. If a new 2210 // class List can be created that is a base class 2211 // of FreeList then something like FreeList::prepend() 2212 // can be used in place of this loop 2213 while (cur != NULL) { 2214 assert(cur->container() != NULL, "Container should have been set"); 2215 cur->container()->dec_container_count(); 2216 // Capture the next link before it is changed 2217 // by the call to return_chunk_at_head(); 2218 Metachunk* next = cur->next(); 2219 DEBUG_ONLY(cur->set_is_tagged_free(true);) 2220 list->return_chunk_at_head(cur); 2221 cur = next; 2222 } 2223 } 2224 2225 SpaceManager::~SpaceManager() { 2226 // This call this->_lock which can't be done while holding expand_lock() 2227 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(), 2228 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT 2229 " allocated_chunks_words() " SIZE_FORMAT, 2230 sum_capacity_in_chunks_in_use(), allocated_chunks_words())); 2231 2232 MutexLockerEx fcl(SpaceManager::expand_lock(), 2233 Mutex::_no_safepoint_check_flag); 2234 2235 chunk_manager()->slow_locked_verify(); 2236 2237 dec_total_from_size_metrics(); 2238 2239 if (TraceMetadataChunkAllocation && Verbose) { 2240 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); 2241 locked_print_chunks_in_use_on(gclog_or_tty); 2242 } 2243 2244 // Do not mangle freed Metachunks. The chunk size inside Metachunks 2245 // is during the freeing of a VirtualSpaceNodes. 2246 2247 // Have to update before the chunks_in_use lists are emptied 2248 // below. 2249 chunk_manager()->inc_free_chunks_total(allocated_chunks_words(), 2250 sum_count_in_chunks_in_use()); 2251 2252 // Add all the chunks in use by this space manager 2253 // to the global list of free chunks. 2254 2255 // Follow each list of chunks-in-use and add them to the 2256 // free lists. Each list is NULL terminated. 2257 2258 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) { 2259 if (TraceMetadataChunkAllocation && Verbose) { 2260 gclog_or_tty->print_cr("returned %d %s chunks to freelist", 2261 sum_count_in_chunks_in_use(i), 2262 chunk_size_name(i)); 2263 } 2264 Metachunk* chunks = chunks_in_use(i); 2265 chunk_manager()->return_chunks(i, chunks); 2266 set_chunks_in_use(i, NULL); 2267 if (TraceMetadataChunkAllocation && Verbose) { 2268 gclog_or_tty->print_cr("updated freelist count %d %s", 2269 chunk_manager()->free_chunks(i)->count(), 2270 chunk_size_name(i)); 2271 } 2272 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later"); 2273 } 2274 2275 // The medium chunk case may be optimized by passing the head and 2276 // tail of the medium chunk list to add_at_head(). The tail is often 2277 // the current chunk but there are probably exceptions. 2278 2279 // Humongous chunks 2280 if (TraceMetadataChunkAllocation && Verbose) { 2281 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary", 2282 sum_count_in_chunks_in_use(HumongousIndex), 2283 chunk_size_name(HumongousIndex)); 2284 gclog_or_tty->print("Humongous chunk dictionary: "); 2285 } 2286 // Humongous chunks are never the current chunk. 2287 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); 2288 2289 while (humongous_chunks != NULL) { 2290 #ifdef ASSERT 2291 humongous_chunks->set_is_tagged_free(true); 2292 #endif 2293 if (TraceMetadataChunkAllocation && Verbose) { 2294 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", 2295 humongous_chunks, 2296 humongous_chunks->word_size()); 2297 } 2298 assert(humongous_chunks->word_size() == (size_t) 2299 align_size_up(humongous_chunks->word_size(), 2300 smallest_chunk_size()), 2301 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT 2302 " granularity %d", 2303 humongous_chunks->word_size(), smallest_chunk_size())); 2304 Metachunk* next_humongous_chunks = humongous_chunks->next(); 2305 humongous_chunks->container()->dec_container_count(); 2306 chunk_manager()->humongous_dictionary()->return_chunk(humongous_chunks); 2307 humongous_chunks = next_humongous_chunks; 2308 } 2309 if (TraceMetadataChunkAllocation && Verbose) { 2310 gclog_or_tty->cr(); 2311 gclog_or_tty->print_cr("updated dictionary count %d %s", 2312 chunk_manager()->humongous_dictionary()->total_count(), 2313 chunk_size_name(HumongousIndex)); 2314 } 2315 chunk_manager()->slow_locked_verify(); 2316 } 2317 2318 const char* SpaceManager::chunk_size_name(ChunkIndex index) const { 2319 switch (index) { 2320 case SpecializedIndex: 2321 return "Specialized"; 2322 case SmallIndex: 2323 return "Small"; 2324 case MediumIndex: 2325 return "Medium"; 2326 case HumongousIndex: 2327 return "Humongous"; 2328 default: 2329 return NULL; 2330 } 2331 } 2332 2333 ChunkIndex ChunkManager::list_index(size_t size) { 2334 switch (size) { 2335 case SpecializedChunk: 2336 assert(SpecializedChunk == ClassSpecializedChunk, 2337 "Need branch for ClassSpecializedChunk"); 2338 return SpecializedIndex; 2339 case SmallChunk: 2340 case ClassSmallChunk: 2341 return SmallIndex; 2342 case MediumChunk: 2343 case ClassMediumChunk: 2344 return MediumIndex; 2345 default: 2346 assert(size > MediumChunk || size > ClassMediumChunk, 2347 "Not a humongous chunk"); 2348 return HumongousIndex; 2349 } 2350 } 2351 2352 void SpaceManager::deallocate(MetaWord* p, size_t word_size) { 2353 assert_lock_strong(_lock); 2354 size_t raw_word_size = get_raw_word_size(word_size); 2355 size_t min_size = TreeChunk<Metablock, FreeList<Metablock> >::min_size(); 2356 assert(raw_word_size >= min_size, 2357 err_msg("Should not deallocate dark matter " SIZE_FORMAT "<" SIZE_FORMAT, word_size, min_size)); 2358 block_freelists()->return_block(p, raw_word_size); 2359 } 2360 2361 // Adds a chunk to the list of chunks in use. 2362 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { 2363 2364 assert(new_chunk != NULL, "Should not be NULL"); 2365 assert(new_chunk->next() == NULL, "Should not be on a list"); 2366 2367 new_chunk->reset_empty(); 2368 2369 // Find the correct list and and set the current 2370 // chunk for that list. 2371 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size()); 2372 2373 if (index != HumongousIndex) { 2374 retire_current_chunk(); 2375 set_current_chunk(new_chunk); 2376 new_chunk->set_next(chunks_in_use(index)); 2377 set_chunks_in_use(index, new_chunk); 2378 } else { 2379 // For null class loader data and DumpSharedSpaces, the first chunk isn't 2380 // small, so small will be null. Link this first chunk as the current 2381 // chunk. 2382 if (make_current) { 2383 // Set as the current chunk but otherwise treat as a humongous chunk. 2384 set_current_chunk(new_chunk); 2385 } 2386 // Link at head. The _current_chunk only points to a humongous chunk for 2387 // the null class loader metaspace (class and data virtual space managers) 2388 // any humongous chunks so will not point to the tail 2389 // of the humongous chunks list. 2390 new_chunk->set_next(chunks_in_use(HumongousIndex)); 2391 set_chunks_in_use(HumongousIndex, new_chunk); 2392 2393 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency"); 2394 } 2395 2396 // Add to the running sum of capacity 2397 inc_size_metrics(new_chunk->word_size()); 2398 2399 assert(new_chunk->is_empty(), "Not ready for reuse"); 2400 if (TraceMetadataChunkAllocation && Verbose) { 2401 gclog_or_tty->print("SpaceManager::add_chunk: %d) ", 2402 sum_count_in_chunks_in_use()); 2403 new_chunk->print_on(gclog_or_tty); 2404 chunk_manager()->locked_print_free_chunks(gclog_or_tty); 2405 } 2406 } 2407 2408 void SpaceManager::retire_current_chunk() { 2409 if (current_chunk() != NULL) { 2410 size_t remaining_words = current_chunk()->free_word_size(); 2411 if (remaining_words >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) { 2412 block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words); 2413 inc_used_metrics(remaining_words); 2414 } 2415 } 2416 } 2417 2418 Metachunk* SpaceManager::get_new_chunk(size_t word_size, 2419 size_t grow_chunks_by_words) { 2420 // Get a chunk from the chunk freelist 2421 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); 2422 2423 if (next == NULL) { 2424 next = vs_list()->get_new_chunk(word_size, 2425 grow_chunks_by_words, 2426 medium_chunk_bunch()); 2427 } 2428 2429 if (TraceMetadataHumongousAllocation && next != NULL && 2430 SpaceManager::is_humongous(next->word_size())) { 2431 gclog_or_tty->print_cr(" new humongous chunk word size " 2432 PTR_FORMAT, next->word_size()); 2433 } 2434 2435 return next; 2436 } 2437 2438 MetaWord* SpaceManager::allocate(size_t word_size) { 2439 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); 2440 2441 size_t raw_word_size = get_raw_word_size(word_size); 2442 BlockFreelist* fl = block_freelists(); 2443 MetaWord* p = NULL; 2444 // Allocation from the dictionary is expensive in the sense that 2445 // the dictionary has to be searched for a size. Don't allocate 2446 // from the dictionary until it starts to get fat. Is this 2447 // a reasonable policy? Maybe an skinny dictionary is fast enough 2448 // for allocations. Do some profiling. JJJ 2449 if (fl->total_size() > allocation_from_dictionary_limit) { 2450 p = fl->get_block(raw_word_size); 2451 } 2452 if (p == NULL) { 2453 p = allocate_work(raw_word_size); 2454 } 2455 2456 return p; 2457 } 2458 2459 // Returns the address of spaced allocated for "word_size". 2460 // This methods does not know about blocks (Metablocks) 2461 MetaWord* SpaceManager::allocate_work(size_t word_size) { 2462 assert_lock_strong(_lock); 2463 #ifdef ASSERT 2464 if (Metadebug::test_metadata_failure()) { 2465 return NULL; 2466 } 2467 #endif 2468 // Is there space in the current chunk? 2469 MetaWord* result = NULL; 2470 2471 // For DumpSharedSpaces, only allocate out of the current chunk which is 2472 // never null because we gave it the size we wanted. Caller reports out 2473 // of memory if this returns null. 2474 if (DumpSharedSpaces) { 2475 assert(current_chunk() != NULL, "should never happen"); 2476 inc_used_metrics(word_size); 2477 return current_chunk()->allocate(word_size); // caller handles null result 2478 } 2479 2480 if (current_chunk() != NULL) { 2481 result = current_chunk()->allocate(word_size); 2482 } 2483 2484 if (result == NULL) { 2485 result = grow_and_allocate(word_size); 2486 } 2487 2488 if (result != NULL) { 2489 inc_used_metrics(word_size); 2490 assert(result != (MetaWord*) chunks_in_use(MediumIndex), 2491 "Head of the list is being allocated"); 2492 } 2493 2494 return result; 2495 } 2496 2497 void SpaceManager::verify() { 2498 // If there are blocks in the dictionary, then 2499 // verification of chunks does not work since 2500 // being in the dictionary alters a chunk. 2501 if (block_freelists()->total_size() == 0) { 2502 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { 2503 Metachunk* curr = chunks_in_use(i); 2504 while (curr != NULL) { 2505 curr->verify(); 2506 verify_chunk_size(curr); 2507 curr = curr->next(); 2508 } 2509 } 2510 } 2511 } 2512 2513 void SpaceManager::verify_chunk_size(Metachunk* chunk) { 2514 assert(is_humongous(chunk->word_size()) || 2515 chunk->word_size() == medium_chunk_size() || 2516 chunk->word_size() == small_chunk_size() || 2517 chunk->word_size() == specialized_chunk_size(), 2518 "Chunk size is wrong"); 2519 return; 2520 } 2521 2522 #ifdef ASSERT 2523 void SpaceManager::verify_allocated_blocks_words() { 2524 // Verification is only guaranteed at a safepoint. 2525 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(), 2526 "Verification can fail if the applications is running"); 2527 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(), 2528 err_msg("allocation total is not consistent " SIZE_FORMAT 2529 " vs " SIZE_FORMAT, 2530 allocated_blocks_words(), sum_used_in_chunks_in_use())); 2531 } 2532 2533 #endif 2534 2535 void SpaceManager::dump(outputStream* const out) const { 2536 size_t curr_total = 0; 2537 size_t waste = 0; 2538 uint i = 0; 2539 size_t used = 0; 2540 size_t capacity = 0; 2541 2542 // Add up statistics for all chunks in this SpaceManager. 2543 for (ChunkIndex index = ZeroIndex; 2544 index < NumberOfInUseLists; 2545 index = next_chunk_index(index)) { 2546 for (Metachunk* curr = chunks_in_use(index); 2547 curr != NULL; 2548 curr = curr->next()) { 2549 out->print("%d) ", i++); 2550 curr->print_on(out); 2551 curr_total += curr->word_size(); 2552 used += curr->used_word_size(); 2553 capacity += curr->word_size(); 2554 waste += curr->free_word_size() + curr->overhead();; 2555 } 2556 } 2557 2558 if (TraceMetadataChunkAllocation && Verbose) { 2559 block_freelists()->print_on(out); 2560 } 2561 2562 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size(); 2563 // Free space isn't wasted. 2564 waste -= free; 2565 2566 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT 2567 " free " SIZE_FORMAT " capacity " SIZE_FORMAT 2568 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); 2569 } 2570 2571 #ifndef PRODUCT 2572 void SpaceManager::mangle_freed_chunks() { 2573 for (ChunkIndex index = ZeroIndex; 2574 index < NumberOfInUseLists; 2575 index = next_chunk_index(index)) { 2576 for (Metachunk* curr = chunks_in_use(index); 2577 curr != NULL; 2578 curr = curr->next()) { 2579 curr->mangle(); 2580 } 2581 } 2582 } 2583 #endif // PRODUCT 2584 2585 // MetaspaceAux 2586 2587 2588 size_t MetaspaceAux::_capacity_words[] = {0, 0}; 2589 size_t MetaspaceAux::_used_words[] = {0, 0}; 2590 2591 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) { 2592 VirtualSpaceList* list = Metaspace::get_space_list(mdtype); 2593 return list == NULL ? 0 : list->free_bytes(); 2594 } 2595 2596 size_t MetaspaceAux::free_bytes() { 2597 return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType); 2598 } 2599 2600 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) { 2601 assert_lock_strong(SpaceManager::expand_lock()); 2602 assert(words <= capacity_words(mdtype), 2603 err_msg("About to decrement below 0: words " SIZE_FORMAT 2604 " is greater than _capacity_words[%u] " SIZE_FORMAT, 2605 words, mdtype, capacity_words(mdtype))); 2606 _capacity_words[mdtype] -= words; 2607 } 2608 2609 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) { 2610 assert_lock_strong(SpaceManager::expand_lock()); 2611 // Needs to be atomic 2612 _capacity_words[mdtype] += words; 2613 } 2614 2615 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) { 2616 assert(words <= used_words(mdtype), 2617 err_msg("About to decrement below 0: words " SIZE_FORMAT 2618 " is greater than _used_words[%u] " SIZE_FORMAT, 2619 words, mdtype, used_words(mdtype))); 2620 // For CMS deallocation of the Metaspaces occurs during the 2621 // sweep which is a concurrent phase. Protection by the expand_lock() 2622 // is not enough since allocation is on a per Metaspace basis 2623 // and protected by the Metaspace lock. 2624 jlong minus_words = (jlong) - (jlong) words; 2625 Atomic::add_ptr(minus_words, &_used_words[mdtype]); 2626 } 2627 2628 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) { 2629 // _used_words tracks allocations for 2630 // each piece of metadata. Those allocations are 2631 // generally done concurrently by different application 2632 // threads so must be done atomically. 2633 Atomic::add_ptr(words, &_used_words[mdtype]); 2634 } 2635 2636 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) { 2637 size_t used = 0; 2638 ClassLoaderDataGraphMetaspaceIterator iter; 2639 while (iter.repeat()) { 2640 Metaspace* msp = iter.get_next(); 2641 // Sum allocated_blocks_words for each metaspace 2642 if (msp != NULL) { 2643 used += msp->used_words_slow(mdtype); 2644 } 2645 } 2646 return used * BytesPerWord; 2647 } 2648 2649 size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) { 2650 size_t free = 0; 2651 ClassLoaderDataGraphMetaspaceIterator iter; 2652 while (iter.repeat()) { 2653 Metaspace* msp = iter.get_next(); 2654 if (msp != NULL) { 2655 free += msp->free_words_slow(mdtype); 2656 } 2657 } 2658 return free * BytesPerWord; 2659 } 2660 2661 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) { 2662 if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) { 2663 return 0; 2664 } 2665 // Don't count the space in the freelists. That space will be 2666 // added to the capacity calculation as needed. 2667 size_t capacity = 0; 2668 ClassLoaderDataGraphMetaspaceIterator iter; 2669 while (iter.repeat()) { 2670 Metaspace* msp = iter.get_next(); 2671 if (msp != NULL) { 2672 capacity += msp->capacity_words_slow(mdtype); 2673 } 2674 } 2675 return capacity * BytesPerWord; 2676 } 2677 2678 size_t MetaspaceAux::capacity_bytes_slow() { 2679 #ifdef PRODUCT 2680 // Use capacity_bytes() in PRODUCT instead of this function. 2681 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT"); 2682 #endif 2683 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType); 2684 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType); 2685 assert(capacity_bytes() == class_capacity + non_class_capacity, 2686 err_msg("bad accounting: capacity_bytes() " SIZE_FORMAT 2687 " class_capacity + non_class_capacity " SIZE_FORMAT 2688 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT, 2689 capacity_bytes(), class_capacity + non_class_capacity, 2690 class_capacity, non_class_capacity)); 2691 2692 return class_capacity + non_class_capacity; 2693 } 2694 2695 size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) { 2696 VirtualSpaceList* list = Metaspace::get_space_list(mdtype); 2697 return list == NULL ? 0 : list->reserved_bytes(); 2698 } 2699 2700 size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) { 2701 VirtualSpaceList* list = Metaspace::get_space_list(mdtype); 2702 return list == NULL ? 0 : list->committed_bytes(); 2703 } 2704 2705 size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); } 2706 2707 size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) { 2708 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype); 2709 if (chunk_manager == NULL) { 2710 return 0; 2711 } 2712 chunk_manager->slow_verify(); 2713 return chunk_manager->free_chunks_total_words(); 2714 } 2715 2716 size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) { 2717 return free_chunks_total_words(mdtype) * BytesPerWord; 2718 } 2719 2720 size_t MetaspaceAux::free_chunks_total_words() { 2721 return free_chunks_total_words(Metaspace::ClassType) + 2722 free_chunks_total_words(Metaspace::NonClassType); 2723 } 2724 2725 size_t MetaspaceAux::free_chunks_total_bytes() { 2726 return free_chunks_total_words() * BytesPerWord; 2727 } 2728 2729 bool MetaspaceAux::has_chunk_free_list(Metaspace::MetadataType mdtype) { 2730 return Metaspace::get_chunk_manager(mdtype) != NULL; 2731 } 2732 2733 MetaspaceChunkFreeListSummary MetaspaceAux::chunk_free_list_summary(Metaspace::MetadataType mdtype) { 2734 if (!has_chunk_free_list(mdtype)) { 2735 return MetaspaceChunkFreeListSummary(); 2736 } 2737 2738 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype); 2739 return cm->chunk_free_list_summary(); 2740 } 2741 2742 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { 2743 gclog_or_tty->print(", [Metaspace:"); 2744 if (PrintGCDetails && Verbose) { 2745 gclog_or_tty->print(" " SIZE_FORMAT 2746 "->" SIZE_FORMAT 2747 "(" SIZE_FORMAT ")", 2748 prev_metadata_used, 2749 used_bytes(), 2750 reserved_bytes()); 2751 } else { 2752 gclog_or_tty->print(" " SIZE_FORMAT "K" 2753 "->" SIZE_FORMAT "K" 2754 "(" SIZE_FORMAT "K)", 2755 prev_metadata_used/K, 2756 used_bytes()/K, 2757 reserved_bytes()/K); 2758 } 2759 2760 gclog_or_tty->print("]"); 2761 } 2762 2763 // This is printed when PrintGCDetails 2764 void MetaspaceAux::print_on(outputStream* out) { 2765 Metaspace::MetadataType nct = Metaspace::NonClassType; 2766 2767 out->print_cr(" Metaspace " 2768 "used " SIZE_FORMAT "K, " 2769 "capacity " SIZE_FORMAT "K, " 2770 "committed " SIZE_FORMAT "K, " 2771 "reserved " SIZE_FORMAT "K", 2772 used_bytes()/K, 2773 capacity_bytes()/K, 2774 committed_bytes()/K, 2775 reserved_bytes()/K); 2776 2777 if (Metaspace::using_class_space()) { 2778 Metaspace::MetadataType ct = Metaspace::ClassType; 2779 out->print_cr(" class space " 2780 "used " SIZE_FORMAT "K, " 2781 "capacity " SIZE_FORMAT "K, " 2782 "committed " SIZE_FORMAT "K, " 2783 "reserved " SIZE_FORMAT "K", 2784 used_bytes(ct)/K, 2785 capacity_bytes(ct)/K, 2786 committed_bytes(ct)/K, 2787 reserved_bytes(ct)/K); 2788 } 2789 } 2790 2791 // Print information for class space and data space separately. 2792 // This is almost the same as above. 2793 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { 2794 size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype); 2795 size_t capacity_bytes = capacity_bytes_slow(mdtype); 2796 size_t used_bytes = used_bytes_slow(mdtype); 2797 size_t free_bytes = free_bytes_slow(mdtype); 2798 size_t used_and_free = used_bytes + free_bytes + 2799 free_chunks_capacity_bytes; 2800 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT 2801 "K + unused in chunks " SIZE_FORMAT "K + " 2802 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT 2803 "K capacity in allocated chunks " SIZE_FORMAT "K", 2804 used_bytes / K, 2805 free_bytes / K, 2806 free_chunks_capacity_bytes / K, 2807 used_and_free / K, 2808 capacity_bytes / K); 2809 // Accounting can only be correct if we got the values during a safepoint 2810 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong"); 2811 } 2812 2813 // Print total fragmentation for class metaspaces 2814 void MetaspaceAux::print_class_waste(outputStream* out) { 2815 assert(Metaspace::using_class_space(), "class metaspace not used"); 2816 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0; 2817 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0; 2818 ClassLoaderDataGraphMetaspaceIterator iter; 2819 while (iter.repeat()) { 2820 Metaspace* msp = iter.get_next(); 2821 if (msp != NULL) { 2822 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); 2823 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex); 2824 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); 2825 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex); 2826 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); 2827 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex); 2828 cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex); 2829 } 2830 } 2831 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " 2832 SIZE_FORMAT " small(s) " SIZE_FORMAT ", " 2833 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", " 2834 "large count " SIZE_FORMAT, 2835 cls_specialized_count, cls_specialized_waste, 2836 cls_small_count, cls_small_waste, 2837 cls_medium_count, cls_medium_waste, cls_humongous_count); 2838 } 2839 2840 // Print total fragmentation for data and class metaspaces separately 2841 void MetaspaceAux::print_waste(outputStream* out) { 2842 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0; 2843 size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0; 2844 2845 ClassLoaderDataGraphMetaspaceIterator iter; 2846 while (iter.repeat()) { 2847 Metaspace* msp = iter.get_next(); 2848 if (msp != NULL) { 2849 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); 2850 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex); 2851 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); 2852 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex); 2853 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); 2854 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex); 2855 humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex); 2856 } 2857 } 2858 out->print_cr("Total fragmentation waste (words) doesn't count free space"); 2859 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " 2860 SIZE_FORMAT " small(s) " SIZE_FORMAT ", " 2861 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", " 2862 "large count " SIZE_FORMAT, 2863 specialized_count, specialized_waste, small_count, 2864 small_waste, medium_count, medium_waste, humongous_count); 2865 if (Metaspace::using_class_space()) { 2866 print_class_waste(out); 2867 } 2868 } 2869 2870 // Dump global metaspace things from the end of ClassLoaderDataGraph 2871 void MetaspaceAux::dump(outputStream* out) { 2872 out->print_cr("All Metaspace:"); 2873 out->print("data space: "); print_on(out, Metaspace::NonClassType); 2874 out->print("class space: "); print_on(out, Metaspace::ClassType); 2875 print_waste(out); 2876 } 2877 2878 void MetaspaceAux::verify_free_chunks() { 2879 Metaspace::chunk_manager_metadata()->verify(); 2880 if (Metaspace::using_class_space()) { 2881 Metaspace::chunk_manager_class()->verify(); 2882 } 2883 } 2884 2885 void MetaspaceAux::verify_capacity() { 2886 #ifdef ASSERT 2887 size_t running_sum_capacity_bytes = capacity_bytes(); 2888 // For purposes of the running sum of capacity, verify against capacity 2889 size_t capacity_in_use_bytes = capacity_bytes_slow(); 2890 assert(running_sum_capacity_bytes == capacity_in_use_bytes, 2891 err_msg("capacity_words() * BytesPerWord " SIZE_FORMAT 2892 " capacity_bytes_slow()" SIZE_FORMAT, 2893 running_sum_capacity_bytes, capacity_in_use_bytes)); 2894 for (Metaspace::MetadataType i = Metaspace::ClassType; 2895 i < Metaspace:: MetadataTypeCount; 2896 i = (Metaspace::MetadataType)(i + 1)) { 2897 size_t capacity_in_use_bytes = capacity_bytes_slow(i); 2898 assert(capacity_bytes(i) == capacity_in_use_bytes, 2899 err_msg("capacity_bytes(%u) " SIZE_FORMAT 2900 " capacity_bytes_slow(%u)" SIZE_FORMAT, 2901 i, capacity_bytes(i), i, capacity_in_use_bytes)); 2902 } 2903 #endif 2904 } 2905 2906 void MetaspaceAux::verify_used() { 2907 #ifdef ASSERT 2908 size_t running_sum_used_bytes = used_bytes(); 2909 // For purposes of the running sum of used, verify against used 2910 size_t used_in_use_bytes = used_bytes_slow(); 2911 assert(used_bytes() == used_in_use_bytes, 2912 err_msg("used_bytes() " SIZE_FORMAT 2913 " used_bytes_slow()" SIZE_FORMAT, 2914 used_bytes(), used_in_use_bytes)); 2915 for (Metaspace::MetadataType i = Metaspace::ClassType; 2916 i < Metaspace:: MetadataTypeCount; 2917 i = (Metaspace::MetadataType)(i + 1)) { 2918 size_t used_in_use_bytes = used_bytes_slow(i); 2919 assert(used_bytes(i) == used_in_use_bytes, 2920 err_msg("used_bytes(%u) " SIZE_FORMAT 2921 " used_bytes_slow(%u)" SIZE_FORMAT, 2922 i, used_bytes(i), i, used_in_use_bytes)); 2923 } 2924 #endif 2925 } 2926 2927 void MetaspaceAux::verify_metrics() { 2928 verify_capacity(); 2929 verify_used(); 2930 } 2931 2932 2933 // Metaspace methods 2934 2935 size_t Metaspace::_first_chunk_word_size = 0; 2936 size_t Metaspace::_first_class_chunk_word_size = 0; 2937 2938 size_t Metaspace::_commit_alignment = 0; 2939 size_t Metaspace::_reserve_alignment = 0; 2940 2941 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) { 2942 initialize(lock, type); 2943 } 2944 2945 Metaspace::~Metaspace() { 2946 delete _vsm; 2947 if (using_class_space()) { 2948 delete _class_vsm; 2949 } 2950 } 2951 2952 VirtualSpaceList* Metaspace::_space_list = NULL; 2953 VirtualSpaceList* Metaspace::_class_space_list = NULL; 2954 2955 ChunkManager* Metaspace::_chunk_manager_metadata = NULL; 2956 ChunkManager* Metaspace::_chunk_manager_class = NULL; 2957 2958 #define VIRTUALSPACEMULTIPLIER 2 2959 2960 #ifdef _LP64 2961 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); 2962 2963 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) { 2964 // Figure out the narrow_klass_base and the narrow_klass_shift. The 2965 // narrow_klass_base is the lower of the metaspace base and the cds base 2966 // (if cds is enabled). The narrow_klass_shift depends on the distance 2967 // between the lower base and higher address. 2968 address lower_base; 2969 address higher_address; 2970 #if INCLUDE_CDS 2971 if (UseSharedSpaces) { 2972 higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()), 2973 (address)(metaspace_base + compressed_class_space_size())); 2974 lower_base = MIN2(metaspace_base, cds_base); 2975 } else 2976 #endif 2977 { 2978 higher_address = metaspace_base + compressed_class_space_size(); 2979 lower_base = metaspace_base; 2980 2981 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes; 2982 // If compressed class space fits in lower 32G, we don't need a base. 2983 if (higher_address <= (address)klass_encoding_max) { 2984 lower_base = 0; // Effectively lower base is zero. 2985 } 2986 } 2987 2988 Universe::set_narrow_klass_base(lower_base); 2989 2990 if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) { 2991 Universe::set_narrow_klass_shift(0); 2992 } else { 2993 assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces"); 2994 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); 2995 } 2996 } 2997 2998 #if INCLUDE_CDS 2999 // Return TRUE if the specified metaspace_base and cds_base are close enough 3000 // to work with compressed klass pointers. 3001 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) { 3002 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS"); 3003 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs"); 3004 address lower_base = MIN2((address)metaspace_base, cds_base); 3005 address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()), 3006 (address)(metaspace_base + compressed_class_space_size())); 3007 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax); 3008 } 3009 #endif 3010 3011 // Try to allocate the metaspace at the requested addr. 3012 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) { 3013 assert(using_class_space(), "called improperly"); 3014 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs"); 3015 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax, 3016 "Metaspace size is too big"); 3017 assert_is_ptr_aligned(requested_addr, _reserve_alignment); 3018 assert_is_ptr_aligned(cds_base, _reserve_alignment); 3019 assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment); 3020 3021 // Don't use large pages for the class space. 3022 bool large_pages = false; 3023 3024 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(), 3025 _reserve_alignment, 3026 large_pages, 3027 requested_addr, 0); 3028 if (!metaspace_rs.is_reserved()) { 3029 #if INCLUDE_CDS 3030 if (UseSharedSpaces) { 3031 size_t increment = align_size_up(1*G, _reserve_alignment); 3032 3033 // Keep trying to allocate the metaspace, increasing the requested_addr 3034 // by 1GB each time, until we reach an address that will no longer allow 3035 // use of CDS with compressed klass pointers. 3036 char *addr = requested_addr; 3037 while (!metaspace_rs.is_reserved() && (addr + increment > addr) && 3038 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) { 3039 addr = addr + increment; 3040 metaspace_rs = ReservedSpace(compressed_class_space_size(), 3041 _reserve_alignment, large_pages, addr, 0); 3042 } 3043 } 3044 #endif 3045 // If no successful allocation then try to allocate the space anywhere. If 3046 // that fails then OOM doom. At this point we cannot try allocating the 3047 // metaspace as if UseCompressedClassPointers is off because too much 3048 // initialization has happened that depends on UseCompressedClassPointers. 3049 // So, UseCompressedClassPointers cannot be turned off at this point. 3050 if (!metaspace_rs.is_reserved()) { 3051 metaspace_rs = ReservedSpace(compressed_class_space_size(), 3052 _reserve_alignment, large_pages); 3053 if (!metaspace_rs.is_reserved()) { 3054 vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes", 3055 compressed_class_space_size())); 3056 } 3057 } 3058 } 3059 3060 // If we got here then the metaspace got allocated. 3061 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass); 3062 3063 #if INCLUDE_CDS 3064 // Verify that we can use shared spaces. Otherwise, turn off CDS. 3065 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) { 3066 FileMapInfo::stop_sharing_and_unmap( 3067 "Could not allocate metaspace at a compatible address"); 3068 } 3069 #endif 3070 set_narrow_klass_base_and_shift((address)metaspace_rs.base(), 3071 UseSharedSpaces ? (address)cds_base : 0); 3072 3073 initialize_class_space(metaspace_rs); 3074 3075 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 3076 gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT, 3077 Universe::narrow_klass_base(), Universe::narrow_klass_shift()); 3078 gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT, 3079 compressed_class_space_size(), metaspace_rs.base(), requested_addr); 3080 } 3081 } 3082 3083 // For UseCompressedClassPointers the class space is reserved above the top of 3084 // the Java heap. The argument passed in is at the base of the compressed space. 3085 void Metaspace::initialize_class_space(ReservedSpace rs) { 3086 // The reserved space size may be bigger because of alignment, esp with UseLargePages 3087 assert(rs.size() >= CompressedClassSpaceSize, 3088 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), CompressedClassSpaceSize)); 3089 assert(using_class_space(), "Must be using class space"); 3090 _class_space_list = new VirtualSpaceList(rs); 3091 _chunk_manager_class = new ChunkManager(SpecializedChunk, ClassSmallChunk, ClassMediumChunk); 3092 3093 if (!_class_space_list->initialization_succeeded()) { 3094 vm_exit_during_initialization("Failed to setup compressed class space virtual space list."); 3095 } 3096 } 3097 3098 #endif 3099 3100 void Metaspace::ergo_initialize() { 3101 if (DumpSharedSpaces) { 3102 // Using large pages when dumping the shared archive is currently not implemented. 3103 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false); 3104 } 3105 3106 size_t page_size = os::vm_page_size(); 3107 if (UseLargePages && UseLargePagesInMetaspace) { 3108 page_size = os::large_page_size(); 3109 } 3110 3111 _commit_alignment = page_size; 3112 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity()); 3113 3114 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will 3115 // override if MaxMetaspaceSize was set on the command line or not. 3116 // This information is needed later to conform to the specification of the 3117 // java.lang.management.MemoryUsage API. 3118 // 3119 // Ideally, we would be able to set the default value of MaxMetaspaceSize in 3120 // globals.hpp to the aligned value, but this is not possible, since the 3121 // alignment depends on other flags being parsed. 3122 MaxMetaspaceSize = align_size_down_bounded(MaxMetaspaceSize, _reserve_alignment); 3123 3124 if (MetaspaceSize > MaxMetaspaceSize) { 3125 MetaspaceSize = MaxMetaspaceSize; 3126 } 3127 3128 MetaspaceSize = align_size_down_bounded(MetaspaceSize, _commit_alignment); 3129 3130 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize"); 3131 3132 if (MetaspaceSize < 256*K) { 3133 vm_exit_during_initialization("Too small initial Metaspace size"); 3134 } 3135 3136 MinMetaspaceExpansion = align_size_down_bounded(MinMetaspaceExpansion, _commit_alignment); 3137 MaxMetaspaceExpansion = align_size_down_bounded(MaxMetaspaceExpansion, _commit_alignment); 3138 3139 CompressedClassSpaceSize = align_size_down_bounded(CompressedClassSpaceSize, _reserve_alignment); 3140 set_compressed_class_space_size(CompressedClassSpaceSize); 3141 } 3142 3143 void Metaspace::global_initialize() { 3144 MetaspaceGC::initialize(); 3145 3146 // Initialize the alignment for shared spaces. 3147 int max_alignment = os::vm_allocation_granularity(); 3148 size_t cds_total = 0; 3149 3150 MetaspaceShared::set_max_alignment(max_alignment); 3151 3152 if (DumpSharedSpaces) { 3153 #if INCLUDE_CDS 3154 MetaspaceShared::estimate_regions_size(); 3155 3156 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); 3157 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); 3158 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); 3159 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); 3160 3161 // make sure SharedReadOnlySize and SharedReadWriteSize are not less than 3162 // the minimum values. 3163 if (SharedReadOnlySize < MetaspaceShared::min_ro_size){ 3164 report_out_of_shared_space(SharedReadOnly); 3165 } 3166 3167 if (SharedReadWriteSize < MetaspaceShared::min_rw_size){ 3168 report_out_of_shared_space(SharedReadWrite); 3169 } 3170 3171 // the min_misc_data_size and min_misc_code_size estimates are based on 3172 // MetaspaceShared::generate_vtable_methods() 3173 uint min_misc_data_size = align_size_up( 3174 MetaspaceShared::num_virtuals * MetaspaceShared::vtbl_list_size * sizeof(void*), max_alignment); 3175 3176 if (SharedMiscDataSize < min_misc_data_size) { 3177 report_out_of_shared_space(SharedMiscData); 3178 } 3179 3180 uintx min_misc_code_size = align_size_up( 3181 (MetaspaceShared::num_virtuals * MetaspaceShared::vtbl_list_size) * 3182 (sizeof(void*) + MetaspaceShared::vtbl_method_size) + MetaspaceShared::vtbl_common_code_size, 3183 max_alignment); 3184 3185 if (SharedMiscCodeSize < min_misc_code_size) { 3186 report_out_of_shared_space(SharedMiscCode); 3187 } 3188 3189 // Initialize with the sum of the shared space sizes. The read-only 3190 // and read write metaspace chunks will be allocated out of this and the 3191 // remainder is the misc code and data chunks. 3192 cds_total = FileMapInfo::shared_spaces_size(); 3193 cds_total = align_size_up(cds_total, _reserve_alignment); 3194 _space_list = new VirtualSpaceList(cds_total/wordSize); 3195 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk); 3196 3197 if (!_space_list->initialization_succeeded()) { 3198 vm_exit_during_initialization("Unable to dump shared archive.", NULL); 3199 } 3200 3201 #ifdef _LP64 3202 if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) { 3203 vm_exit_during_initialization("Unable to dump shared archive.", 3204 err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space (" 3205 SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed " 3206 "klass limit: " SIZE_FORMAT, cds_total, compressed_class_space_size(), 3207 cds_total + compressed_class_space_size(), UnscaledClassSpaceMax)); 3208 } 3209 3210 // Set the compressed klass pointer base so that decoding of these pointers works 3211 // properly when creating the shared archive. 3212 assert(UseCompressedOops && UseCompressedClassPointers, 3213 "UseCompressedOops and UseCompressedClassPointers must be set"); 3214 Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom()); 3215 if (TraceMetavirtualspaceAllocation && Verbose) { 3216 gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT, 3217 _space_list->current_virtual_space()->bottom()); 3218 } 3219 3220 Universe::set_narrow_klass_shift(0); 3221 #endif // _LP64 3222 #endif // INCLUDE_CDS 3223 } else { 3224 #if INCLUDE_CDS 3225 // If using shared space, open the file that contains the shared space 3226 // and map in the memory before initializing the rest of metaspace (so 3227 // the addresses don't conflict) 3228 address cds_address = NULL; 3229 if (UseSharedSpaces) { 3230 FileMapInfo* mapinfo = new FileMapInfo(); 3231 3232 // Open the shared archive file, read and validate the header. If 3233 // initialization fails, shared spaces [UseSharedSpaces] are 3234 // disabled and the file is closed. 3235 // Map in spaces now also 3236 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { 3237 cds_total = FileMapInfo::shared_spaces_size(); 3238 cds_address = (address)mapinfo->region_base(0); 3239 } else { 3240 assert(!mapinfo->is_open() && !UseSharedSpaces, 3241 "archive file not closed or shared spaces not disabled."); 3242 } 3243 } 3244 #endif // INCLUDE_CDS 3245 #ifdef _LP64 3246 // If UseCompressedClassPointers is set then allocate the metaspace area 3247 // above the heap and above the CDS area (if it exists). 3248 if (using_class_space()) { 3249 if (UseSharedSpaces) { 3250 #if INCLUDE_CDS 3251 char* cds_end = (char*)(cds_address + cds_total); 3252 cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment); 3253 allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address); 3254 #endif 3255 } else { 3256 char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment); 3257 allocate_metaspace_compressed_klass_ptrs(base, 0); 3258 } 3259 } 3260 #endif // _LP64 3261 3262 // Initialize these before initializing the VirtualSpaceList 3263 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; 3264 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size); 3265 // Make the first class chunk bigger than a medium chunk so it's not put 3266 // on the medium chunk list. The next chunk will be small and progress 3267 // from there. This size calculated by -version. 3268 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6, 3269 (CompressedClassSpaceSize/BytesPerWord)*2); 3270 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size); 3271 // Arbitrarily set the initial virtual space to a multiple 3272 // of the boot class loader size. 3273 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size; 3274 word_size = align_size_up(word_size, Metaspace::reserve_alignment_words()); 3275 3276 // Initialize the list of virtual spaces. 3277 _space_list = new VirtualSpaceList(word_size); 3278 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk); 3279 3280 if (!_space_list->initialization_succeeded()) { 3281 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL); 3282 } 3283 } 3284 3285 _tracer = new MetaspaceTracer(); 3286 } 3287 3288 void Metaspace::post_initialize() { 3289 MetaspaceGC::post_initialize(); 3290 } 3291 3292 Metachunk* Metaspace::get_initialization_chunk(MetadataType mdtype, 3293 size_t chunk_word_size, 3294 size_t chunk_bunch) { 3295 // Get a chunk from the chunk freelist 3296 Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size); 3297 if (chunk != NULL) { 3298 return chunk; 3299 } 3300 3301 return get_space_list(mdtype)->get_new_chunk(chunk_word_size, chunk_word_size, chunk_bunch); 3302 } 3303 3304 void Metaspace::initialize(Mutex* lock, MetaspaceType type) { 3305 3306 assert(space_list() != NULL, 3307 "Metadata VirtualSpaceList has not been initialized"); 3308 assert(chunk_manager_metadata() != NULL, 3309 "Metadata ChunkManager has not been initialized"); 3310 3311 _vsm = new SpaceManager(NonClassType, lock); 3312 if (_vsm == NULL) { 3313 return; 3314 } 3315 size_t word_size; 3316 size_t class_word_size; 3317 vsm()->get_initial_chunk_sizes(type, &word_size, &class_word_size); 3318 3319 if (using_class_space()) { 3320 assert(class_space_list() != NULL, 3321 "Class VirtualSpaceList has not been initialized"); 3322 assert(chunk_manager_class() != NULL, 3323 "Class ChunkManager has not been initialized"); 3324 3325 // Allocate SpaceManager for classes. 3326 _class_vsm = new SpaceManager(ClassType, lock); 3327 if (_class_vsm == NULL) { 3328 return; 3329 } 3330 } 3331 3332 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); 3333 3334 // Allocate chunk for metadata objects 3335 Metachunk* new_chunk = get_initialization_chunk(NonClassType, 3336 word_size, 3337 vsm()->medium_chunk_bunch()); 3338 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks"); 3339 if (new_chunk != NULL) { 3340 // Add to this manager's list of chunks in use and current_chunk(). 3341 vsm()->add_chunk(new_chunk, true); 3342 } 3343 3344 // Allocate chunk for class metadata objects 3345 if (using_class_space()) { 3346 Metachunk* class_chunk = get_initialization_chunk(ClassType, 3347 class_word_size, 3348 class_vsm()->medium_chunk_bunch()); 3349 if (class_chunk != NULL) { 3350 class_vsm()->add_chunk(class_chunk, true); 3351 } 3352 } 3353 3354 _alloc_record_head = NULL; 3355 _alloc_record_tail = NULL; 3356 } 3357 3358 size_t Metaspace::align_word_size_up(size_t word_size) { 3359 size_t byte_size = word_size * wordSize; 3360 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize; 3361 } 3362 3363 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { 3364 // DumpSharedSpaces doesn't use class metadata area (yet) 3365 // Also, don't use class_vsm() unless UseCompressedClassPointers is true. 3366 if (is_class_space_allocation(mdtype)) { 3367 return class_vsm()->allocate(word_size); 3368 } else { 3369 return vsm()->allocate(word_size); 3370 } 3371 } 3372 3373 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) { 3374 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord); 3375 assert(delta_bytes > 0, "Must be"); 3376 3377 size_t before = 0; 3378 size_t after = 0; 3379 MetaWord* res; 3380 bool incremented; 3381 3382 // Each thread increments the HWM at most once. Even if the thread fails to increment 3383 // the HWM, an allocation is still attempted. This is because another thread must then 3384 // have incremented the HWM and therefore the allocation might still succeed. 3385 do { 3386 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before); 3387 res = allocate(word_size, mdtype); 3388 } while (!incremented && res == NULL); 3389 3390 if (incremented) { 3391 tracer()->report_gc_threshold(before, after, 3392 MetaspaceGCThresholdUpdater::ExpandAndAllocate); 3393 if (PrintGCDetails && Verbose) { 3394 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT 3395 " to " SIZE_FORMAT, before, after); 3396 } 3397 } 3398 3399 return res; 3400 } 3401 3402 // Space allocated in the Metaspace. This may 3403 // be across several metadata virtual spaces. 3404 char* Metaspace::bottom() const { 3405 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); 3406 return (char*)vsm()->current_chunk()->bottom(); 3407 } 3408 3409 size_t Metaspace::used_words_slow(MetadataType mdtype) const { 3410 if (mdtype == ClassType) { 3411 return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0; 3412 } else { 3413 return vsm()->sum_used_in_chunks_in_use(); // includes overhead! 3414 } 3415 } 3416 3417 size_t Metaspace::free_words_slow(MetadataType mdtype) const { 3418 if (mdtype == ClassType) { 3419 return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0; 3420 } else { 3421 return vsm()->sum_free_in_chunks_in_use(); 3422 } 3423 } 3424 3425 // Space capacity in the Metaspace. It includes 3426 // space in the list of chunks from which allocations 3427 // have been made. Don't include space in the global freelist and 3428 // in the space available in the dictionary which 3429 // is already counted in some chunk. 3430 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const { 3431 if (mdtype == ClassType) { 3432 return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0; 3433 } else { 3434 return vsm()->sum_capacity_in_chunks_in_use(); 3435 } 3436 } 3437 3438 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const { 3439 return used_words_slow(mdtype) * BytesPerWord; 3440 } 3441 3442 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const { 3443 return capacity_words_slow(mdtype) * BytesPerWord; 3444 } 3445 3446 size_t Metaspace::allocated_blocks_bytes() const { 3447 return vsm()->allocated_blocks_bytes() + 3448 (using_class_space() ? class_vsm()->allocated_blocks_bytes() : 0); 3449 } 3450 3451 size_t Metaspace::allocated_chunks_bytes() const { 3452 return vsm()->allocated_chunks_bytes() + 3453 (using_class_space() ? class_vsm()->allocated_chunks_bytes() : 0); 3454 } 3455 3456 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { 3457 assert(!SafepointSynchronize::is_at_safepoint() 3458 || Thread::current()->is_VM_thread(), "should be the VM thread"); 3459 3460 if (DumpSharedSpaces && PrintSharedSpaces) { 3461 record_deallocation(ptr, vsm()->get_raw_word_size(word_size)); 3462 } 3463 3464 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag); 3465 3466 if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) { 3467 // Dark matter. Too small for dictionary. 3468 #ifdef ASSERT 3469 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5); 3470 #endif 3471 return; 3472 } 3473 if (is_class && using_class_space()) { 3474 class_vsm()->deallocate(ptr, word_size); 3475 } else { 3476 vsm()->deallocate(ptr, word_size); 3477 } 3478 } 3479 3480 3481 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, 3482 bool read_only, MetaspaceObj::Type type, TRAPS) { 3483 if (HAS_PENDING_EXCEPTION) { 3484 assert(false, "Should not allocate with exception pending"); 3485 return NULL; // caller does a CHECK_NULL too 3486 } 3487 3488 assert(loader_data != NULL, "Should never pass around a NULL loader_data. " 3489 "ClassLoaderData::the_null_class_loader_data() should have been used."); 3490 3491 // Allocate in metaspaces without taking out a lock, because it deadlocks 3492 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have 3493 // to revisit this for application class data sharing. 3494 if (DumpSharedSpaces) { 3495 assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity"); 3496 Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace(); 3497 MetaWord* result = space->allocate(word_size, NonClassType); 3498 if (result == NULL) { 3499 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); 3500 } 3501 if (PrintSharedSpaces) { 3502 space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size)); 3503 } 3504 3505 // Zero initialize. 3506 Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0); 3507 3508 return result; 3509 } 3510 3511 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType; 3512 3513 // Try to allocate metadata. 3514 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); 3515 3516 if (result == NULL) { 3517 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype); 3518 3519 // Allocation failed. 3520 if (is_init_completed()) { 3521 // Only start a GC if the bootstrapping has completed. 3522 3523 // Try to clean out some memory and retry. 3524 result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( 3525 loader_data, word_size, mdtype); 3526 } 3527 } 3528 3529 if (result == NULL) { 3530 report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL); 3531 } 3532 3533 // Zero initialize. 3534 Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0); 3535 3536 return result; 3537 } 3538 3539 size_t Metaspace::class_chunk_size(size_t word_size) { 3540 assert(using_class_space(), "Has to use class space"); 3541 return class_vsm()->calc_chunk_size(word_size); 3542 } 3543 3544 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) { 3545 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype); 3546 3547 // If result is still null, we are out of memory. 3548 if (Verbose && TraceMetadataChunkAllocation) { 3549 gclog_or_tty->print_cr("Metaspace allocation failed for size " 3550 SIZE_FORMAT, word_size); 3551 if (loader_data->metaspace_or_null() != NULL) { 3552 loader_data->dump(gclog_or_tty); 3553 } 3554 MetaspaceAux::dump(gclog_or_tty); 3555 } 3556 3557 bool out_of_compressed_class_space = false; 3558 if (is_class_space_allocation(mdtype)) { 3559 Metaspace* metaspace = loader_data->metaspace_non_null(); 3560 out_of_compressed_class_space = 3561 MetaspaceAux::committed_bytes(Metaspace::ClassType) + 3562 (metaspace->class_chunk_size(word_size) * BytesPerWord) > 3563 CompressedClassSpaceSize; 3564 } 3565 3566 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 3567 const char* space_string = out_of_compressed_class_space ? 3568 "Compressed class space" : "Metaspace"; 3569 3570 report_java_out_of_memory(space_string); 3571 3572 if (JvmtiExport::should_post_resource_exhausted()) { 3573 JvmtiExport::post_resource_exhausted( 3574 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, 3575 space_string); 3576 } 3577 3578 if (!is_init_completed()) { 3579 vm_exit_during_initialization("OutOfMemoryError", space_string); 3580 } 3581 3582 if (out_of_compressed_class_space) { 3583 THROW_OOP(Universe::out_of_memory_error_class_metaspace()); 3584 } else { 3585 THROW_OOP(Universe::out_of_memory_error_metaspace()); 3586 } 3587 } 3588 3589 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) { 3590 switch (mdtype) { 3591 case Metaspace::ClassType: return "Class"; 3592 case Metaspace::NonClassType: return "Metadata"; 3593 default: 3594 assert(false, err_msg("Got bad mdtype: %d", (int) mdtype)); 3595 return NULL; 3596 } 3597 } 3598 3599 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) { 3600 assert(DumpSharedSpaces, "sanity"); 3601 3602 int byte_size = (int)word_size * HeapWordSize; 3603 AllocRecord *rec = new AllocRecord((address)ptr, type, byte_size); 3604 3605 if (_alloc_record_head == NULL) { 3606 _alloc_record_head = _alloc_record_tail = rec; 3607 } else if (_alloc_record_tail->_ptr + _alloc_record_tail->_byte_size == (address)ptr) { 3608 _alloc_record_tail->_next = rec; 3609 _alloc_record_tail = rec; 3610 } else { 3611 // slow linear search, but this doesn't happen that often, and only when dumping 3612 for (AllocRecord *old = _alloc_record_head; old; old = old->_next) { 3613 if (old->_ptr == ptr) { 3614 assert(old->_type == MetaspaceObj::DeallocatedType, "sanity"); 3615 int remain_bytes = old->_byte_size - byte_size; 3616 assert(remain_bytes >= 0, "sanity"); 3617 old->_type = type; 3618 3619 if (remain_bytes == 0) { 3620 delete(rec); 3621 } else { 3622 address remain_ptr = address(ptr) + byte_size; 3623 rec->_ptr = remain_ptr; 3624 rec->_byte_size = remain_bytes; 3625 rec->_type = MetaspaceObj::DeallocatedType; 3626 rec->_next = old->_next; 3627 old->_byte_size = byte_size; 3628 old->_next = rec; 3629 } 3630 return; 3631 } 3632 } 3633 assert(0, "reallocating a freed pointer that was not recorded"); 3634 } 3635 } 3636 3637 void Metaspace::record_deallocation(void* ptr, size_t word_size) { 3638 assert(DumpSharedSpaces, "sanity"); 3639 3640 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) { 3641 if (rec->_ptr == ptr) { 3642 assert(rec->_byte_size == (int)word_size * HeapWordSize, "sanity"); 3643 rec->_type = MetaspaceObj::DeallocatedType; 3644 return; 3645 } 3646 } 3647 3648 assert(0, "deallocating a pointer that was not recorded"); 3649 } 3650 3651 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) { 3652 assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces"); 3653 3654 address last_addr = (address)bottom(); 3655 3656 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) { 3657 address ptr = rec->_ptr; 3658 if (last_addr < ptr) { 3659 closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr); 3660 } 3661 closure->doit(ptr, rec->_type, rec->_byte_size); 3662 last_addr = ptr + rec->_byte_size; 3663 } 3664 3665 address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType); 3666 if (last_addr < top) { 3667 closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr); 3668 } 3669 } 3670 3671 void Metaspace::purge(MetadataType mdtype) { 3672 get_space_list(mdtype)->purge(get_chunk_manager(mdtype)); 3673 } 3674 3675 void Metaspace::purge() { 3676 MutexLockerEx cl(SpaceManager::expand_lock(), 3677 Mutex::_no_safepoint_check_flag); 3678 purge(NonClassType); 3679 if (using_class_space()) { 3680 purge(ClassType); 3681 } 3682 } 3683 3684 void Metaspace::print_on(outputStream* out) const { 3685 // Print both class virtual space counts and metaspace. 3686 if (Verbose) { 3687 vsm()->print_on(out); 3688 if (using_class_space()) { 3689 class_vsm()->print_on(out); 3690 } 3691 } 3692 } 3693 3694 bool Metaspace::contains(const void* ptr) { 3695 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(ptr)) { 3696 return true; 3697 } 3698 3699 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) { 3700 return true; 3701 } 3702 3703 return get_space_list(NonClassType)->contains(ptr); 3704 } 3705 3706 void Metaspace::verify() { 3707 vsm()->verify(); 3708 if (using_class_space()) { 3709 class_vsm()->verify(); 3710 } 3711 } 3712 3713 void Metaspace::dump(outputStream* const out) const { 3714 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); 3715 vsm()->dump(out); 3716 if (using_class_space()) { 3717 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); 3718 class_vsm()->dump(out); 3719 } 3720 } 3721 3722 /////////////// Unit tests /////////////// 3723 3724 #ifndef PRODUCT 3725 3726 class TestMetaspaceAuxTest : AllStatic { 3727 public: 3728 static void test_reserved() { 3729 size_t reserved = MetaspaceAux::reserved_bytes(); 3730 3731 assert(reserved > 0, "assert"); 3732 3733 size_t committed = MetaspaceAux::committed_bytes(); 3734 assert(committed <= reserved, "assert"); 3735 3736 size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType); 3737 assert(reserved_metadata > 0, "assert"); 3738 assert(reserved_metadata <= reserved, "assert"); 3739 3740 if (UseCompressedClassPointers) { 3741 size_t reserved_class = MetaspaceAux::reserved_bytes(Metaspace::ClassType); 3742 assert(reserved_class > 0, "assert"); 3743 assert(reserved_class < reserved, "assert"); 3744 } 3745 } 3746 3747 static void test_committed() { 3748 size_t committed = MetaspaceAux::committed_bytes(); 3749 3750 assert(committed > 0, "assert"); 3751 3752 size_t reserved = MetaspaceAux::reserved_bytes(); 3753 assert(committed <= reserved, "assert"); 3754 3755 size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType); 3756 assert(committed_metadata > 0, "assert"); 3757 assert(committed_metadata <= committed, "assert"); 3758 3759 if (UseCompressedClassPointers) { 3760 size_t committed_class = MetaspaceAux::committed_bytes(Metaspace::ClassType); 3761 assert(committed_class > 0, "assert"); 3762 assert(committed_class < committed, "assert"); 3763 } 3764 } 3765 3766 static void test_virtual_space_list_large_chunk() { 3767 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity()); 3768 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); 3769 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be 3770 // vm_allocation_granularity aligned on Windows. 3771 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord)); 3772 large_size += (os::vm_page_size()/BytesPerWord); 3773 vs_list->get_new_chunk(large_size, large_size, 0); 3774 } 3775 3776 static void test() { 3777 test_reserved(); 3778 test_committed(); 3779 test_virtual_space_list_large_chunk(); 3780 } 3781 }; 3782 3783 void TestMetaspaceAux_test() { 3784 TestMetaspaceAuxTest::test(); 3785 } 3786 3787 class TestVirtualSpaceNodeTest { 3788 static void chunk_up(size_t words_left, size_t& num_medium_chunks, 3789 size_t& num_small_chunks, 3790 size_t& num_specialized_chunks) { 3791 num_medium_chunks = words_left / MediumChunk; 3792 words_left = words_left % MediumChunk; 3793 3794 num_small_chunks = words_left / SmallChunk; 3795 words_left = words_left % SmallChunk; 3796 // how many specialized chunks can we get? 3797 num_specialized_chunks = words_left / SpecializedChunk; 3798 assert(words_left % SpecializedChunk == 0, "should be nothing left"); 3799 } 3800 3801 public: 3802 static void test() { 3803 MutexLockerEx ml(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); 3804 const size_t vsn_test_size_words = MediumChunk * 4; 3805 const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord; 3806 3807 // The chunk sizes must be multiples of eachother, or this will fail 3808 STATIC_ASSERT(MediumChunk % SmallChunk == 0); 3809 STATIC_ASSERT(SmallChunk % SpecializedChunk == 0); 3810 3811 { // No committed memory in VSN 3812 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); 3813 VirtualSpaceNode vsn(vsn_test_size_bytes); 3814 vsn.initialize(); 3815 vsn.retire(&cm); 3816 assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN"); 3817 } 3818 3819 { // All of VSN is committed, half is used by chunks 3820 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); 3821 VirtualSpaceNode vsn(vsn_test_size_bytes); 3822 vsn.initialize(); 3823 vsn.expand_by(vsn_test_size_words, vsn_test_size_words); 3824 vsn.get_chunk_vs(MediumChunk); 3825 vsn.get_chunk_vs(MediumChunk); 3826 vsn.retire(&cm); 3827 assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks"); 3828 assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up"); 3829 } 3830 3831 { // 4 pages of VSN is committed, some is used by chunks 3832 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); 3833 VirtualSpaceNode vsn(vsn_test_size_bytes); 3834 const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord; 3835 assert(page_chunks < MediumChunk, "Test expects medium chunks to be at least 4*page_size"); 3836 vsn.initialize(); 3837 vsn.expand_by(page_chunks, page_chunks); 3838 vsn.get_chunk_vs(SmallChunk); 3839 vsn.get_chunk_vs(SpecializedChunk); 3840 vsn.retire(&cm); 3841 3842 // committed - used = words left to retire 3843 const size_t words_left = page_chunks - SmallChunk - SpecializedChunk; 3844 3845 size_t num_medium_chunks, num_small_chunks, num_spec_chunks; 3846 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks); 3847 3848 assert(num_medium_chunks == 0, "should not get any medium chunks"); 3849 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks"); 3850 assert(cm.sum_free_chunks() == words_left, "sizes should add up"); 3851 } 3852 3853 { // Half of VSN is committed, a humongous chunk is used 3854 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); 3855 VirtualSpaceNode vsn(vsn_test_size_bytes); 3856 vsn.initialize(); 3857 vsn.expand_by(MediumChunk * 2, MediumChunk * 2); 3858 vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk 3859 vsn.retire(&cm); 3860 3861 const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk); 3862 size_t num_medium_chunks, num_small_chunks, num_spec_chunks; 3863 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks); 3864 3865 assert(num_medium_chunks == 0, "should not get any medium chunks"); 3866 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks"); 3867 assert(cm.sum_free_chunks() == words_left, "sizes should add up"); 3868 } 3869 3870 } 3871 3872 #define assert_is_available_positive(word_size) \ 3873 assert(vsn.is_available(word_size), \ 3874 err_msg(#word_size ": " PTR_FORMAT " bytes were not available in " \ 3875 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \ 3876 (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end())); 3877 3878 #define assert_is_available_negative(word_size) \ 3879 assert(!vsn.is_available(word_size), \ 3880 err_msg(#word_size ": " PTR_FORMAT " bytes should not be available in " \ 3881 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \ 3882 (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end())); 3883 3884 static void test_is_available_positive() { 3885 // Reserve some memory. 3886 VirtualSpaceNode vsn(os::vm_allocation_granularity()); 3887 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); 3888 3889 // Commit some memory. 3890 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; 3891 bool expanded = vsn.expand_by(commit_word_size, commit_word_size); 3892 assert(expanded, "Failed to commit"); 3893 3894 // Check that is_available accepts the committed size. 3895 assert_is_available_positive(commit_word_size); 3896 3897 // Check that is_available accepts half the committed size. 3898 size_t expand_word_size = commit_word_size / 2; 3899 assert_is_available_positive(expand_word_size); 3900 } 3901 3902 static void test_is_available_negative() { 3903 // Reserve some memory. 3904 VirtualSpaceNode vsn(os::vm_allocation_granularity()); 3905 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); 3906 3907 // Commit some memory. 3908 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; 3909 bool expanded = vsn.expand_by(commit_word_size, commit_word_size); 3910 assert(expanded, "Failed to commit"); 3911 3912 // Check that is_available doesn't accept a too large size. 3913 size_t two_times_commit_word_size = commit_word_size * 2; 3914 assert_is_available_negative(two_times_commit_word_size); 3915 } 3916 3917 static void test_is_available_overflow() { 3918 // Reserve some memory. 3919 VirtualSpaceNode vsn(os::vm_allocation_granularity()); 3920 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); 3921 3922 // Commit some memory. 3923 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; 3924 bool expanded = vsn.expand_by(commit_word_size, commit_word_size); 3925 assert(expanded, "Failed to commit"); 3926 3927 // Calculate a size that will overflow the virtual space size. 3928 void* virtual_space_max = (void*)(uintptr_t)-1; 3929 size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1); 3930 size_t overflow_size = bottom_to_max + BytesPerWord; 3931 size_t overflow_word_size = overflow_size / BytesPerWord; 3932 3933 // Check that is_available can handle the overflow. 3934 assert_is_available_negative(overflow_word_size); 3935 } 3936 3937 static void test_is_available() { 3938 TestVirtualSpaceNodeTest::test_is_available_positive(); 3939 TestVirtualSpaceNodeTest::test_is_available_negative(); 3940 TestVirtualSpaceNodeTest::test_is_available_overflow(); 3941 } 3942 }; 3943 3944 void TestVirtualSpaceNode_test() { 3945 TestVirtualSpaceNodeTest::test(); 3946 TestVirtualSpaceNodeTest::test_is_available(); 3947 } 3948 #endif