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