Mon, 07 Oct 2013 15:51:17 +0200
8025996: Track metaspace usage when metaspace is expanded
Reviewed-by: coleenp, ehelin
1 /*
2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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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/metablock.hpp"
34 #include "memory/metachunk.hpp"
35 #include "memory/metaspace.hpp"
36 #include "memory/metaspaceShared.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "runtime/atomic.inline.hpp"
40 #include "runtime/globals.hpp"
41 #include "runtime/init.hpp"
42 #include "runtime/java.hpp"
43 #include "runtime/mutex.hpp"
44 #include "runtime/orderAccess.hpp"
45 #include "services/memTracker.hpp"
46 #include "services/memoryService.hpp"
47 #include "utilities/copy.hpp"
48 #include "utilities/debug.hpp"
50 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
51 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
52 // Define this macro to enable slow integrity checking of
53 // the free chunk lists
54 const bool metaspace_slow_verify = false;
56 // Parameters for stress mode testing
57 const uint metadata_deallocate_a_lot_block = 10;
58 const uint metadata_deallocate_a_lock_chunk = 3;
59 size_t const allocation_from_dictionary_limit = 4 * K;
61 MetaWord* last_allocated = 0;
63 size_t Metaspace::_class_metaspace_size;
65 // Used in declarations in SpaceManager and ChunkManager
66 enum ChunkIndex {
67 ZeroIndex = 0,
68 SpecializedIndex = ZeroIndex,
69 SmallIndex = SpecializedIndex + 1,
70 MediumIndex = SmallIndex + 1,
71 HumongousIndex = MediumIndex + 1,
72 NumberOfFreeLists = 3,
73 NumberOfInUseLists = 4
74 };
76 enum ChunkSizes { // in words.
77 ClassSpecializedChunk = 128,
78 SpecializedChunk = 128,
79 ClassSmallChunk = 256,
80 SmallChunk = 512,
81 ClassMediumChunk = 4 * K,
82 MediumChunk = 8 * K,
83 HumongousChunkGranularity = 8
84 };
86 static ChunkIndex next_chunk_index(ChunkIndex i) {
87 assert(i < NumberOfInUseLists, "Out of bound");
88 return (ChunkIndex) (i+1);
89 }
91 volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
92 uint MetaspaceGC::_shrink_factor = 0;
93 bool MetaspaceGC::_should_concurrent_collect = false;
95 // Blocks of space for metadata are allocated out of Metachunks.
96 //
97 // Metachunk are allocated out of MetadataVirtualspaces and once
98 // allocated there is no explicit link between a Metachunk and
99 // the MetadataVirtualspaces from which it was allocated.
100 //
101 // Each SpaceManager maintains a
102 // list of the chunks it is using and the current chunk. The current
103 // chunk is the chunk from which allocations are done. Space freed in
104 // a chunk is placed on the free list of blocks (BlockFreelist) and
105 // reused from there.
107 typedef class FreeList<Metachunk> ChunkList;
109 // Manages the global free lists of chunks.
110 // Has three lists of free chunks, and a total size and
111 // count that includes all three
113 class ChunkManager : public CHeapObj<mtInternal> {
115 // Free list of chunks of different sizes.
116 // SpecializedChunk
117 // SmallChunk
118 // MediumChunk
119 // HumongousChunk
120 ChunkList _free_chunks[NumberOfFreeLists];
123 // HumongousChunk
124 ChunkTreeDictionary _humongous_dictionary;
126 // ChunkManager in all lists of this type
127 size_t _free_chunks_total;
128 size_t _free_chunks_count;
130 void dec_free_chunks_total(size_t v) {
131 assert(_free_chunks_count > 0 &&
132 _free_chunks_total > 0,
133 "About to go negative");
134 Atomic::add_ptr(-1, &_free_chunks_count);
135 jlong minus_v = (jlong) - (jlong) v;
136 Atomic::add_ptr(minus_v, &_free_chunks_total);
137 }
139 // Debug support
141 size_t sum_free_chunks();
142 size_t sum_free_chunks_count();
144 void locked_verify_free_chunks_total();
145 void slow_locked_verify_free_chunks_total() {
146 if (metaspace_slow_verify) {
147 locked_verify_free_chunks_total();
148 }
149 }
150 void locked_verify_free_chunks_count();
151 void slow_locked_verify_free_chunks_count() {
152 if (metaspace_slow_verify) {
153 locked_verify_free_chunks_count();
154 }
155 }
156 void verify_free_chunks_count();
158 public:
160 ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size)
161 : _free_chunks_total(0), _free_chunks_count(0) {
162 _free_chunks[SpecializedIndex].set_size(specialized_size);
163 _free_chunks[SmallIndex].set_size(small_size);
164 _free_chunks[MediumIndex].set_size(medium_size);
165 }
167 // add or delete (return) a chunk to the global freelist.
168 Metachunk* chunk_freelist_allocate(size_t word_size);
169 void chunk_freelist_deallocate(Metachunk* chunk);
171 // Map a size to a list index assuming that there are lists
172 // for special, small, medium, and humongous chunks.
173 static ChunkIndex list_index(size_t size);
175 // Remove the chunk from its freelist. It is
176 // expected to be on one of the _free_chunks[] lists.
177 void remove_chunk(Metachunk* chunk);
179 // Add the simple linked list of chunks to the freelist of chunks
180 // of type index.
181 void return_chunks(ChunkIndex index, Metachunk* chunks);
183 // Total of the space in the free chunks list
184 size_t free_chunks_total_words();
185 size_t free_chunks_total_bytes();
187 // Number of chunks in the free chunks list
188 size_t free_chunks_count();
190 void inc_free_chunks_total(size_t v, size_t count = 1) {
191 Atomic::add_ptr(count, &_free_chunks_count);
192 Atomic::add_ptr(v, &_free_chunks_total);
193 }
194 ChunkTreeDictionary* humongous_dictionary() {
195 return &_humongous_dictionary;
196 }
198 ChunkList* free_chunks(ChunkIndex index);
200 // Returns the list for the given chunk word size.
201 ChunkList* find_free_chunks_list(size_t word_size);
203 // Add and remove from a list by size. Selects
204 // list based on size of chunk.
205 void free_chunks_put(Metachunk* chuck);
206 Metachunk* free_chunks_get(size_t chunk_word_size);
208 // Debug support
209 void verify();
210 void slow_verify() {
211 if (metaspace_slow_verify) {
212 verify();
213 }
214 }
215 void locked_verify();
216 void slow_locked_verify() {
217 if (metaspace_slow_verify) {
218 locked_verify();
219 }
220 }
221 void verify_free_chunks_total();
223 void locked_print_free_chunks(outputStream* st);
224 void locked_print_sum_free_chunks(outputStream* st);
226 void print_on(outputStream* st) const;
227 };
229 // Used to manage the free list of Metablocks (a block corresponds
230 // to the allocation of a quantum of metadata).
231 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
232 BlockTreeDictionary* _dictionary;
233 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
235 // Only allocate and split from freelist if the size of the allocation
236 // is at least 1/4th the size of the available block.
237 const static int WasteMultiplier = 4;
239 // Accessors
240 BlockTreeDictionary* dictionary() const { return _dictionary; }
242 public:
243 BlockFreelist();
244 ~BlockFreelist();
246 // Get and return a block to the free list
247 MetaWord* get_block(size_t word_size);
248 void return_block(MetaWord* p, size_t word_size);
250 size_t total_size() {
251 if (dictionary() == NULL) {
252 return 0;
253 } else {
254 return dictionary()->total_size();
255 }
256 }
258 void print_on(outputStream* st) const;
259 };
261 class VirtualSpaceNode : public CHeapObj<mtClass> {
262 friend class VirtualSpaceList;
264 // Link to next VirtualSpaceNode
265 VirtualSpaceNode* _next;
267 // total in the VirtualSpace
268 MemRegion _reserved;
269 ReservedSpace _rs;
270 VirtualSpace _virtual_space;
271 MetaWord* _top;
272 // count of chunks contained in this VirtualSpace
273 uintx _container_count;
275 // Convenience functions to access the _virtual_space
276 char* low() const { return virtual_space()->low(); }
277 char* high() const { return virtual_space()->high(); }
279 // The first Metachunk will be allocated at the bottom of the
280 // VirtualSpace
281 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
283 public:
285 VirtualSpaceNode(size_t byte_size);
286 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
287 ~VirtualSpaceNode();
289 // Convenience functions for logical bottom and end
290 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
291 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
293 size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; }
294 size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; }
296 bool is_pre_committed() const { return _virtual_space.special(); }
298 // address of next available space in _virtual_space;
299 // Accessors
300 VirtualSpaceNode* next() { return _next; }
301 void set_next(VirtualSpaceNode* v) { _next = v; }
303 void set_reserved(MemRegion const v) { _reserved = v; }
304 void set_top(MetaWord* v) { _top = v; }
306 // Accessors
307 MemRegion* reserved() { return &_reserved; }
308 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
310 // Returns true if "word_size" is available in the VirtualSpace
311 bool is_available(size_t word_size) { return _top + word_size <= end(); }
313 MetaWord* top() const { return _top; }
314 void inc_top(size_t word_size) { _top += word_size; }
316 uintx container_count() { return _container_count; }
317 void inc_container_count();
318 void dec_container_count();
319 #ifdef ASSERT
320 uint container_count_slow();
321 void verify_container_count();
322 #endif
324 // used and capacity in this single entry in the list
325 size_t used_words_in_vs() const;
326 size_t capacity_words_in_vs() const;
327 size_t free_words_in_vs() const;
329 bool initialize();
331 // get space from the virtual space
332 Metachunk* take_from_committed(size_t chunk_word_size);
334 // Allocate a chunk from the virtual space and return it.
335 Metachunk* get_chunk_vs(size_t chunk_word_size);
337 // Expands/shrinks the committed space in a virtual space. Delegates
338 // to Virtualspace
339 bool expand_by(size_t min_words, size_t preferred_words);
341 // In preparation for deleting this node, remove all the chunks
342 // in the node from any freelist.
343 void purge(ChunkManager* chunk_manager);
345 #ifdef ASSERT
346 // Debug support
347 void mangle();
348 #endif
350 void print_on(outputStream* st) const;
351 };
353 #define assert_is_ptr_aligned(ptr, alignment) \
354 assert(is_ptr_aligned(ptr, alignment), \
355 err_msg(PTR_FORMAT " is not aligned to " \
356 SIZE_FORMAT, ptr, alignment))
358 #define assert_is_size_aligned(size, alignment) \
359 assert(is_size_aligned(size, alignment), \
360 err_msg(SIZE_FORMAT " is not aligned to " \
361 SIZE_FORMAT, size, alignment))
364 // Decide if large pages should be committed when the memory is reserved.
365 static bool should_commit_large_pages_when_reserving(size_t bytes) {
366 if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) {
367 size_t words = bytes / BytesPerWord;
368 bool is_class = false; // We never reserve large pages for the class space.
369 if (MetaspaceGC::can_expand(words, is_class) &&
370 MetaspaceGC::allowed_expansion() >= words) {
371 return true;
372 }
373 }
375 return false;
376 }
378 // byte_size is the size of the associated virtualspace.
379 VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
380 assert_is_size_aligned(bytes, Metaspace::reserve_alignment());
382 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
383 // configurable address, generally at the top of the Java heap so other
384 // memory addresses don't conflict.
385 if (DumpSharedSpaces) {
386 bool large_pages = false; // No large pages when dumping the CDS archive.
387 char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment());
389 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base, 0);
390 if (_rs.is_reserved()) {
391 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
392 } else {
393 // Get a mmap region anywhere if the SharedBaseAddress fails.
394 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
395 }
396 MetaspaceShared::set_shared_rs(&_rs);
397 } else {
398 bool large_pages = should_commit_large_pages_when_reserving(bytes);
400 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
401 }
403 if (_rs.is_reserved()) {
404 assert(_rs.base() != NULL, "Catch if we get a NULL address");
405 assert(_rs.size() != 0, "Catch if we get a 0 size");
406 assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment());
407 assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment());
409 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
410 }
411 }
413 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
414 Metachunk* chunk = first_chunk();
415 Metachunk* invalid_chunk = (Metachunk*) top();
416 while (chunk < invalid_chunk ) {
417 assert(chunk->is_free(), "Should be marked free");
418 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
419 chunk_manager->remove_chunk(chunk);
420 assert(chunk->next() == NULL &&
421 chunk->prev() == NULL,
422 "Was not removed from its list");
423 chunk = (Metachunk*) next;
424 }
425 }
427 #ifdef ASSERT
428 uint VirtualSpaceNode::container_count_slow() {
429 uint count = 0;
430 Metachunk* chunk = first_chunk();
431 Metachunk* invalid_chunk = (Metachunk*) top();
432 while (chunk < invalid_chunk ) {
433 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
434 // Don't count the chunks on the free lists. Those are
435 // still part of the VirtualSpaceNode but not currently
436 // counted.
437 if (!chunk->is_free()) {
438 count++;
439 }
440 chunk = (Metachunk*) next;
441 }
442 return count;
443 }
444 #endif
446 // List of VirtualSpaces for metadata allocation.
447 class VirtualSpaceList : public CHeapObj<mtClass> {
448 friend class VirtualSpaceNode;
450 enum VirtualSpaceSizes {
451 VirtualSpaceSize = 256 * K
452 };
454 // Head of the list
455 VirtualSpaceNode* _virtual_space_list;
456 // virtual space currently being used for allocations
457 VirtualSpaceNode* _current_virtual_space;
459 // Is this VirtualSpaceList used for the compressed class space
460 bool _is_class;
462 // Sum of reserved and committed memory in the virtual spaces
463 size_t _reserved_words;
464 size_t _committed_words;
466 // Number of virtual spaces
467 size_t _virtual_space_count;
469 ~VirtualSpaceList();
471 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
473 void set_virtual_space_list(VirtualSpaceNode* v) {
474 _virtual_space_list = v;
475 }
476 void set_current_virtual_space(VirtualSpaceNode* v) {
477 _current_virtual_space = v;
478 }
480 void link_vs(VirtualSpaceNode* new_entry);
482 // Get another virtual space and add it to the list. This
483 // is typically prompted by a failed attempt to allocate a chunk
484 // and is typically followed by the allocation of a chunk.
485 bool create_new_virtual_space(size_t vs_word_size);
487 public:
488 VirtualSpaceList(size_t word_size);
489 VirtualSpaceList(ReservedSpace rs);
491 size_t free_bytes();
493 Metachunk* get_new_chunk(size_t word_size,
494 size_t grow_chunks_by_words,
495 size_t medium_chunk_bunch);
497 bool expand_node_by(VirtualSpaceNode* node,
498 size_t min_words,
499 size_t preferred_words);
501 bool expand_by(size_t min_words,
502 size_t preferred_words);
504 VirtualSpaceNode* current_virtual_space() {
505 return _current_virtual_space;
506 }
508 bool is_class() const { return _is_class; }
510 bool initialization_succeeded() { return _virtual_space_list != NULL; }
512 size_t reserved_words() { return _reserved_words; }
513 size_t reserved_bytes() { return reserved_words() * BytesPerWord; }
514 size_t committed_words() { return _committed_words; }
515 size_t committed_bytes() { return committed_words() * BytesPerWord; }
517 void inc_reserved_words(size_t v);
518 void dec_reserved_words(size_t v);
519 void inc_committed_words(size_t v);
520 void dec_committed_words(size_t v);
521 void inc_virtual_space_count();
522 void dec_virtual_space_count();
524 // Unlink empty VirtualSpaceNodes and free it.
525 void purge(ChunkManager* chunk_manager);
527 bool contains(const void *ptr);
529 void print_on(outputStream* st) const;
531 class VirtualSpaceListIterator : public StackObj {
532 VirtualSpaceNode* _virtual_spaces;
533 public:
534 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
535 _virtual_spaces(virtual_spaces) {}
537 bool repeat() {
538 return _virtual_spaces != NULL;
539 }
541 VirtualSpaceNode* get_next() {
542 VirtualSpaceNode* result = _virtual_spaces;
543 if (_virtual_spaces != NULL) {
544 _virtual_spaces = _virtual_spaces->next();
545 }
546 return result;
547 }
548 };
549 };
551 class Metadebug : AllStatic {
552 // Debugging support for Metaspaces
553 static int _deallocate_block_a_lot_count;
554 static int _deallocate_chunk_a_lot_count;
555 static int _allocation_fail_alot_count;
557 public:
558 static int deallocate_block_a_lot_count() {
559 return _deallocate_block_a_lot_count;
560 }
561 static void set_deallocate_block_a_lot_count(int v) {
562 _deallocate_block_a_lot_count = v;
563 }
564 static void inc_deallocate_block_a_lot_count() {
565 _deallocate_block_a_lot_count++;
566 }
567 static int deallocate_chunk_a_lot_count() {
568 return _deallocate_chunk_a_lot_count;
569 }
570 static void reset_deallocate_chunk_a_lot_count() {
571 _deallocate_chunk_a_lot_count = 1;
572 }
573 static void inc_deallocate_chunk_a_lot_count() {
574 _deallocate_chunk_a_lot_count++;
575 }
577 static void init_allocation_fail_alot_count();
578 #ifdef ASSERT
579 static bool test_metadata_failure();
580 #endif
582 static void deallocate_chunk_a_lot(SpaceManager* sm,
583 size_t chunk_word_size);
584 static void deallocate_block_a_lot(SpaceManager* sm,
585 size_t chunk_word_size);
587 };
589 int Metadebug::_deallocate_block_a_lot_count = 0;
590 int Metadebug::_deallocate_chunk_a_lot_count = 0;
591 int Metadebug::_allocation_fail_alot_count = 0;
593 // SpaceManager - used by Metaspace to handle allocations
594 class SpaceManager : public CHeapObj<mtClass> {
595 friend class Metaspace;
596 friend class Metadebug;
598 private:
600 // protects allocations and contains.
601 Mutex* const _lock;
603 // Type of metadata allocated.
604 Metaspace::MetadataType _mdtype;
606 // List of chunks in use by this SpaceManager. Allocations
607 // are done from the current chunk. The list is used for deallocating
608 // chunks when the SpaceManager is freed.
609 Metachunk* _chunks_in_use[NumberOfInUseLists];
610 Metachunk* _current_chunk;
612 // Number of small chunks to allocate to a manager
613 // If class space manager, small chunks are unlimited
614 static uint const _small_chunk_limit;
616 // Sum of all space in allocated chunks
617 size_t _allocated_blocks_words;
619 // Sum of all allocated chunks
620 size_t _allocated_chunks_words;
621 size_t _allocated_chunks_count;
623 // Free lists of blocks are per SpaceManager since they
624 // are assumed to be in chunks in use by the SpaceManager
625 // and all chunks in use by a SpaceManager are freed when
626 // the class loader using the SpaceManager is collected.
627 BlockFreelist _block_freelists;
629 // protects virtualspace and chunk expansions
630 static const char* _expand_lock_name;
631 static const int _expand_lock_rank;
632 static Mutex* const _expand_lock;
634 private:
635 // Accessors
636 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
637 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
639 BlockFreelist* block_freelists() const {
640 return (BlockFreelist*) &_block_freelists;
641 }
643 Metaspace::MetadataType mdtype() { return _mdtype; }
645 VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); }
646 ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); }
648 Metachunk* current_chunk() const { return _current_chunk; }
649 void set_current_chunk(Metachunk* v) {
650 _current_chunk = v;
651 }
653 Metachunk* find_current_chunk(size_t word_size);
655 // Add chunk to the list of chunks in use
656 void add_chunk(Metachunk* v, bool make_current);
657 void retire_current_chunk();
659 Mutex* lock() const { return _lock; }
661 const char* chunk_size_name(ChunkIndex index) const;
663 protected:
664 void initialize();
666 public:
667 SpaceManager(Metaspace::MetadataType mdtype,
668 Mutex* lock);
669 ~SpaceManager();
671 enum ChunkMultiples {
672 MediumChunkMultiple = 4
673 };
675 bool is_class() { return _mdtype == Metaspace::ClassType; }
677 // Accessors
678 size_t specialized_chunk_size() { return SpecializedChunk; }
679 size_t small_chunk_size() { return (size_t) is_class() ? ClassSmallChunk : SmallChunk; }
680 size_t medium_chunk_size() { return (size_t) is_class() ? ClassMediumChunk : MediumChunk; }
681 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
683 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
684 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
685 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
686 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
688 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
690 static Mutex* expand_lock() { return _expand_lock; }
692 // Increment the per Metaspace and global running sums for Metachunks
693 // by the given size. This is used when a Metachunk to added to
694 // the in-use list.
695 void inc_size_metrics(size_t words);
696 // Increment the per Metaspace and global running sums Metablocks by the given
697 // size. This is used when a Metablock is allocated.
698 void inc_used_metrics(size_t words);
699 // Delete the portion of the running sums for this SpaceManager. That is,
700 // the globals running sums for the Metachunks and Metablocks are
701 // decremented for all the Metachunks in-use by this SpaceManager.
702 void dec_total_from_size_metrics();
704 // Set the sizes for the initial chunks.
705 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
706 size_t* chunk_word_size,
707 size_t* class_chunk_word_size);
709 size_t sum_capacity_in_chunks_in_use() const;
710 size_t sum_used_in_chunks_in_use() const;
711 size_t sum_free_in_chunks_in_use() const;
712 size_t sum_waste_in_chunks_in_use() const;
713 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
715 size_t sum_count_in_chunks_in_use();
716 size_t sum_count_in_chunks_in_use(ChunkIndex i);
718 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
720 // Block allocation and deallocation.
721 // Allocates a block from the current chunk
722 MetaWord* allocate(size_t word_size);
724 // Helper for allocations
725 MetaWord* allocate_work(size_t word_size);
727 // Returns a block to the per manager freelist
728 void deallocate(MetaWord* p, size_t word_size);
730 // Based on the allocation size and a minimum chunk size,
731 // returned chunk size (for expanding space for chunk allocation).
732 size_t calc_chunk_size(size_t allocation_word_size);
734 // Called when an allocation from the current chunk fails.
735 // Gets a new chunk (may require getting a new virtual space),
736 // and allocates from that chunk.
737 MetaWord* grow_and_allocate(size_t word_size);
739 // Notify memory usage to MemoryService.
740 void track_metaspace_memory_usage();
742 // debugging support.
744 void dump(outputStream* const out) const;
745 void print_on(outputStream* st) const;
746 void locked_print_chunks_in_use_on(outputStream* st) const;
748 void verify();
749 void verify_chunk_size(Metachunk* chunk);
750 NOT_PRODUCT(void mangle_freed_chunks();)
751 #ifdef ASSERT
752 void verify_allocated_blocks_words();
753 #endif
755 size_t get_raw_word_size(size_t word_size) {
756 // If only the dictionary is going to be used (i.e., no
757 // indexed free list), then there is a minimum size requirement.
758 // MinChunkSize is a placeholder for the real minimum size JJJ
759 size_t byte_size = word_size * BytesPerWord;
761 size_t raw_bytes_size = MAX2(byte_size,
762 Metablock::min_block_byte_size());
763 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
764 size_t raw_word_size = raw_bytes_size / BytesPerWord;
765 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
767 return raw_word_size;
768 }
769 };
771 uint const SpaceManager::_small_chunk_limit = 4;
773 const char* SpaceManager::_expand_lock_name =
774 "SpaceManager chunk allocation lock";
775 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
776 Mutex* const SpaceManager::_expand_lock =
777 new Mutex(SpaceManager::_expand_lock_rank,
778 SpaceManager::_expand_lock_name,
779 Mutex::_allow_vm_block_flag);
781 void VirtualSpaceNode::inc_container_count() {
782 assert_lock_strong(SpaceManager::expand_lock());
783 _container_count++;
784 assert(_container_count == container_count_slow(),
785 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
786 " container_count_slow() " SIZE_FORMAT,
787 _container_count, container_count_slow()));
788 }
790 void VirtualSpaceNode::dec_container_count() {
791 assert_lock_strong(SpaceManager::expand_lock());
792 _container_count--;
793 }
795 #ifdef ASSERT
796 void VirtualSpaceNode::verify_container_count() {
797 assert(_container_count == container_count_slow(),
798 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
799 " container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
800 }
801 #endif
803 // BlockFreelist methods
805 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
807 BlockFreelist::~BlockFreelist() {
808 if (_dictionary != NULL) {
809 if (Verbose && TraceMetadataChunkAllocation) {
810 _dictionary->print_free_lists(gclog_or_tty);
811 }
812 delete _dictionary;
813 }
814 }
816 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
817 Metablock* block = (Metablock*) p;
818 block->set_word_size(word_size);
819 block->set_prev(NULL);
820 block->set_next(NULL);
822 return block;
823 }
825 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
826 Metablock* free_chunk = initialize_free_chunk(p, word_size);
827 if (dictionary() == NULL) {
828 _dictionary = new BlockTreeDictionary();
829 }
830 dictionary()->return_chunk(free_chunk);
831 }
833 MetaWord* BlockFreelist::get_block(size_t word_size) {
834 if (dictionary() == NULL) {
835 return NULL;
836 }
838 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
839 // Dark matter. Too small for dictionary.
840 return NULL;
841 }
843 Metablock* free_block =
844 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast);
845 if (free_block == NULL) {
846 return NULL;
847 }
849 const size_t block_size = free_block->size();
850 if (block_size > WasteMultiplier * word_size) {
851 return_block((MetaWord*)free_block, block_size);
852 return NULL;
853 }
855 MetaWord* new_block = (MetaWord*)free_block;
856 assert(block_size >= word_size, "Incorrect size of block from freelist");
857 const size_t unused = block_size - word_size;
858 if (unused >= TreeChunk<Metablock, FreeList>::min_size()) {
859 return_block(new_block + word_size, unused);
860 }
862 return new_block;
863 }
865 void BlockFreelist::print_on(outputStream* st) const {
866 if (dictionary() == NULL) {
867 return;
868 }
869 dictionary()->print_free_lists(st);
870 }
872 // VirtualSpaceNode methods
874 VirtualSpaceNode::~VirtualSpaceNode() {
875 _rs.release();
876 #ifdef ASSERT
877 size_t word_size = sizeof(*this) / BytesPerWord;
878 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
879 #endif
880 }
882 size_t VirtualSpaceNode::used_words_in_vs() const {
883 return pointer_delta(top(), bottom(), sizeof(MetaWord));
884 }
886 // Space committed in the VirtualSpace
887 size_t VirtualSpaceNode::capacity_words_in_vs() const {
888 return pointer_delta(end(), bottom(), sizeof(MetaWord));
889 }
891 size_t VirtualSpaceNode::free_words_in_vs() const {
892 return pointer_delta(end(), top(), sizeof(MetaWord));
893 }
895 // Allocates the chunk from the virtual space only.
896 // This interface is also used internally for debugging. Not all
897 // chunks removed here are necessarily used for allocation.
898 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
899 // Bottom of the new chunk
900 MetaWord* chunk_limit = top();
901 assert(chunk_limit != NULL, "Not safe to call this method");
903 // The virtual spaces are always expanded by the
904 // commit granularity to enforce the following condition.
905 // Without this the is_available check will not work correctly.
906 assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(),
907 "The committed memory doesn't match the expanded memory.");
909 if (!is_available(chunk_word_size)) {
910 if (TraceMetadataChunkAllocation) {
911 gclog_or_tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
912 // Dump some information about the virtual space that is nearly full
913 print_on(gclog_or_tty);
914 }
915 return NULL;
916 }
918 // Take the space (bump top on the current virtual space).
919 inc_top(chunk_word_size);
921 // Initialize the chunk
922 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
923 return result;
924 }
927 // Expand the virtual space (commit more of the reserved space)
928 bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) {
929 size_t min_bytes = min_words * BytesPerWord;
930 size_t preferred_bytes = preferred_words * BytesPerWord;
932 size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size();
934 if (uncommitted < min_bytes) {
935 return false;
936 }
938 size_t commit = MIN2(preferred_bytes, uncommitted);
939 bool result = virtual_space()->expand_by(commit, false);
941 assert(result, "Failed to commit memory");
943 return result;
944 }
946 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
947 assert_lock_strong(SpaceManager::expand_lock());
948 Metachunk* result = take_from_committed(chunk_word_size);
949 if (result != NULL) {
950 inc_container_count();
951 }
952 return result;
953 }
955 bool VirtualSpaceNode::initialize() {
957 if (!_rs.is_reserved()) {
958 return false;
959 }
961 // These are necessary restriction to make sure that the virtual space always
962 // grows in steps of Metaspace::commit_alignment(). If both base and size are
963 // aligned only the middle alignment of the VirtualSpace is used.
964 assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment());
965 assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment());
967 // ReservedSpaces marked as special will have the entire memory
968 // pre-committed. Setting a committed size will make sure that
969 // committed_size and actual_committed_size agrees.
970 size_t pre_committed_size = _rs.special() ? _rs.size() : 0;
972 bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size,
973 Metaspace::commit_alignment());
974 if (result) {
975 assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(),
976 "Checking that the pre-committed memory was registered by the VirtualSpace");
978 set_top((MetaWord*)virtual_space()->low());
979 set_reserved(MemRegion((HeapWord*)_rs.base(),
980 (HeapWord*)(_rs.base() + _rs.size())));
982 assert(reserved()->start() == (HeapWord*) _rs.base(),
983 err_msg("Reserved start was not set properly " PTR_FORMAT
984 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
985 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
986 err_msg("Reserved size was not set properly " SIZE_FORMAT
987 " != " SIZE_FORMAT, reserved()->word_size(),
988 _rs.size() / BytesPerWord));
989 }
991 return result;
992 }
994 void VirtualSpaceNode::print_on(outputStream* st) const {
995 size_t used = used_words_in_vs();
996 size_t capacity = capacity_words_in_vs();
997 VirtualSpace* vs = virtual_space();
998 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
999 "[" PTR_FORMAT ", " PTR_FORMAT ", "
1000 PTR_FORMAT ", " PTR_FORMAT ")",
1001 vs, capacity / K,
1002 capacity == 0 ? 0 : used * 100 / capacity,
1003 bottom(), top(), end(),
1004 vs->high_boundary());
1005 }
1007 #ifdef ASSERT
1008 void VirtualSpaceNode::mangle() {
1009 size_t word_size = capacity_words_in_vs();
1010 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
1011 }
1012 #endif // ASSERT
1014 // VirtualSpaceList methods
1015 // Space allocated from the VirtualSpace
1017 VirtualSpaceList::~VirtualSpaceList() {
1018 VirtualSpaceListIterator iter(virtual_space_list());
1019 while (iter.repeat()) {
1020 VirtualSpaceNode* vsl = iter.get_next();
1021 delete vsl;
1022 }
1023 }
1025 void VirtualSpaceList::inc_reserved_words(size_t v) {
1026 assert_lock_strong(SpaceManager::expand_lock());
1027 _reserved_words = _reserved_words + v;
1028 }
1029 void VirtualSpaceList::dec_reserved_words(size_t v) {
1030 assert_lock_strong(SpaceManager::expand_lock());
1031 _reserved_words = _reserved_words - v;
1032 }
1034 #define assert_committed_below_limit() \
1035 assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize, \
1036 err_msg("Too much committed memory. Committed: " SIZE_FORMAT \
1037 " limit (MaxMetaspaceSize): " SIZE_FORMAT, \
1038 MetaspaceAux::committed_bytes(), MaxMetaspaceSize));
1040 void VirtualSpaceList::inc_committed_words(size_t v) {
1041 assert_lock_strong(SpaceManager::expand_lock());
1042 _committed_words = _committed_words + v;
1044 assert_committed_below_limit();
1045 }
1046 void VirtualSpaceList::dec_committed_words(size_t v) {
1047 assert_lock_strong(SpaceManager::expand_lock());
1048 _committed_words = _committed_words - v;
1050 assert_committed_below_limit();
1051 }
1053 void VirtualSpaceList::inc_virtual_space_count() {
1054 assert_lock_strong(SpaceManager::expand_lock());
1055 _virtual_space_count++;
1056 }
1057 void VirtualSpaceList::dec_virtual_space_count() {
1058 assert_lock_strong(SpaceManager::expand_lock());
1059 _virtual_space_count--;
1060 }
1062 void ChunkManager::remove_chunk(Metachunk* chunk) {
1063 size_t word_size = chunk->word_size();
1064 ChunkIndex index = list_index(word_size);
1065 if (index != HumongousIndex) {
1066 free_chunks(index)->remove_chunk(chunk);
1067 } else {
1068 humongous_dictionary()->remove_chunk(chunk);
1069 }
1071 // Chunk is being removed from the chunks free list.
1072 dec_free_chunks_total(chunk->capacity_word_size());
1073 }
1075 // Walk the list of VirtualSpaceNodes and delete
1076 // nodes with a 0 container_count. Remove Metachunks in
1077 // the node from their respective freelists.
1078 void VirtualSpaceList::purge(ChunkManager* chunk_manager) {
1079 assert_lock_strong(SpaceManager::expand_lock());
1080 // Don't use a VirtualSpaceListIterator because this
1081 // list is being changed and a straightforward use of an iterator is not safe.
1082 VirtualSpaceNode* purged_vsl = NULL;
1083 VirtualSpaceNode* prev_vsl = virtual_space_list();
1084 VirtualSpaceNode* next_vsl = prev_vsl;
1085 while (next_vsl != NULL) {
1086 VirtualSpaceNode* vsl = next_vsl;
1087 next_vsl = vsl->next();
1088 // Don't free the current virtual space since it will likely
1089 // be needed soon.
1090 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
1091 // Unlink it from the list
1092 if (prev_vsl == vsl) {
1093 // This is the case of the current node being the first node.
1094 assert(vsl == virtual_space_list(), "Expected to be the first node");
1095 set_virtual_space_list(vsl->next());
1096 } else {
1097 prev_vsl->set_next(vsl->next());
1098 }
1100 vsl->purge(chunk_manager);
1101 dec_reserved_words(vsl->reserved_words());
1102 dec_committed_words(vsl->committed_words());
1103 dec_virtual_space_count();
1104 purged_vsl = vsl;
1105 delete vsl;
1106 } else {
1107 prev_vsl = vsl;
1108 }
1109 }
1110 #ifdef ASSERT
1111 if (purged_vsl != NULL) {
1112 // List should be stable enough to use an iterator here.
1113 VirtualSpaceListIterator iter(virtual_space_list());
1114 while (iter.repeat()) {
1115 VirtualSpaceNode* vsl = iter.get_next();
1116 assert(vsl != purged_vsl, "Purge of vsl failed");
1117 }
1118 }
1119 #endif
1120 }
1122 VirtualSpaceList::VirtualSpaceList(size_t word_size) :
1123 _is_class(false),
1124 _virtual_space_list(NULL),
1125 _current_virtual_space(NULL),
1126 _reserved_words(0),
1127 _committed_words(0),
1128 _virtual_space_count(0) {
1129 MutexLockerEx cl(SpaceManager::expand_lock(),
1130 Mutex::_no_safepoint_check_flag);
1131 create_new_virtual_space(word_size);
1132 }
1134 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
1135 _is_class(true),
1136 _virtual_space_list(NULL),
1137 _current_virtual_space(NULL),
1138 _reserved_words(0),
1139 _committed_words(0),
1140 _virtual_space_count(0) {
1141 MutexLockerEx cl(SpaceManager::expand_lock(),
1142 Mutex::_no_safepoint_check_flag);
1143 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
1144 bool succeeded = class_entry->initialize();
1145 if (succeeded) {
1146 link_vs(class_entry);
1147 }
1148 }
1150 size_t VirtualSpaceList::free_bytes() {
1151 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
1152 }
1154 // Allocate another meta virtual space and add it to the list.
1155 bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) {
1156 assert_lock_strong(SpaceManager::expand_lock());
1158 if (is_class()) {
1159 assert(false, "We currently don't support more than one VirtualSpace for"
1160 " the compressed class space. The initialization of the"
1161 " CCS uses another code path and should not hit this path.");
1162 return false;
1163 }
1165 if (vs_word_size == 0) {
1166 assert(false, "vs_word_size should always be at least _reserve_alignment large.");
1167 return false;
1168 }
1170 // Reserve the space
1171 size_t vs_byte_size = vs_word_size * BytesPerWord;
1172 assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment());
1174 // Allocate the meta virtual space and initialize it.
1175 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
1176 if (!new_entry->initialize()) {
1177 delete new_entry;
1178 return false;
1179 } else {
1180 assert(new_entry->reserved_words() == vs_word_size,
1181 "Reserved memory size differs from requested memory size");
1182 // ensure lock-free iteration sees fully initialized node
1183 OrderAccess::storestore();
1184 link_vs(new_entry);
1185 return true;
1186 }
1187 }
1189 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) {
1190 if (virtual_space_list() == NULL) {
1191 set_virtual_space_list(new_entry);
1192 } else {
1193 current_virtual_space()->set_next(new_entry);
1194 }
1195 set_current_virtual_space(new_entry);
1196 inc_reserved_words(new_entry->reserved_words());
1197 inc_committed_words(new_entry->committed_words());
1198 inc_virtual_space_count();
1199 #ifdef ASSERT
1200 new_entry->mangle();
1201 #endif
1202 if (TraceMetavirtualspaceAllocation && Verbose) {
1203 VirtualSpaceNode* vsl = current_virtual_space();
1204 vsl->print_on(gclog_or_tty);
1205 }
1206 }
1208 bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node,
1209 size_t min_words,
1210 size_t preferred_words) {
1211 size_t before = node->committed_words();
1213 bool result = node->expand_by(min_words, preferred_words);
1215 size_t after = node->committed_words();
1217 // after and before can be the same if the memory was pre-committed.
1218 assert(after >= before, "Inconsistency");
1219 inc_committed_words(after - before);
1221 return result;
1222 }
1224 bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) {
1225 assert_is_size_aligned(min_words, Metaspace::commit_alignment_words());
1226 assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words());
1227 assert(min_words <= preferred_words, "Invalid arguments");
1229 if (!MetaspaceGC::can_expand(min_words, this->is_class())) {
1230 return false;
1231 }
1233 size_t allowed_expansion_words = MetaspaceGC::allowed_expansion();
1234 if (allowed_expansion_words < min_words) {
1235 return false;
1236 }
1238 size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words);
1240 // Commit more memory from the the current virtual space.
1241 bool vs_expanded = expand_node_by(current_virtual_space(),
1242 min_words,
1243 max_expansion_words);
1244 if (vs_expanded) {
1245 return true;
1246 }
1248 // Get another virtual space.
1249 size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words);
1250 grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words());
1252 if (create_new_virtual_space(grow_vs_words)) {
1253 if (current_virtual_space()->is_pre_committed()) {
1254 // The memory was pre-committed, so we are done here.
1255 assert(min_words <= current_virtual_space()->committed_words(),
1256 "The new VirtualSpace was pre-committed, so it"
1257 "should be large enough to fit the alloc request.");
1258 return true;
1259 }
1261 return expand_node_by(current_virtual_space(),
1262 min_words,
1263 max_expansion_words);
1264 }
1266 return false;
1267 }
1269 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
1270 size_t grow_chunks_by_words,
1271 size_t medium_chunk_bunch) {
1273 // Allocate a chunk out of the current virtual space.
1274 Metachunk* next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
1276 if (next != NULL) {
1277 return next;
1278 }
1280 // The expand amount is currently only determined by the requested sizes
1281 // and not how much committed memory is left in the current virtual space.
1283 size_t min_word_size = align_size_up(grow_chunks_by_words, Metaspace::commit_alignment_words());
1284 size_t preferred_word_size = align_size_up(medium_chunk_bunch, Metaspace::commit_alignment_words());
1285 if (min_word_size >= preferred_word_size) {
1286 // Can happen when humongous chunks are allocated.
1287 preferred_word_size = min_word_size;
1288 }
1290 bool expanded = expand_by(min_word_size, preferred_word_size);
1291 if (expanded) {
1292 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
1293 assert(next != NULL, "The allocation was expected to succeed after the expansion");
1294 }
1296 return next;
1297 }
1299 void VirtualSpaceList::print_on(outputStream* st) const {
1300 if (TraceMetadataChunkAllocation && Verbose) {
1301 VirtualSpaceListIterator iter(virtual_space_list());
1302 while (iter.repeat()) {
1303 VirtualSpaceNode* node = iter.get_next();
1304 node->print_on(st);
1305 }
1306 }
1307 }
1309 bool VirtualSpaceList::contains(const void *ptr) {
1310 VirtualSpaceNode* list = virtual_space_list();
1311 VirtualSpaceListIterator iter(list);
1312 while (iter.repeat()) {
1313 VirtualSpaceNode* node = iter.get_next();
1314 if (node->reserved()->contains(ptr)) {
1315 return true;
1316 }
1317 }
1318 return false;
1319 }
1322 // MetaspaceGC methods
1324 // VM_CollectForMetadataAllocation is the vm operation used to GC.
1325 // Within the VM operation after the GC the attempt to allocate the metadata
1326 // should succeed. If the GC did not free enough space for the metaspace
1327 // allocation, the HWM is increased so that another virtualspace will be
1328 // allocated for the metadata. With perm gen the increase in the perm
1329 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
1330 // metaspace policy uses those as the small and large steps for the HWM.
1331 //
1332 // After the GC the compute_new_size() for MetaspaceGC is called to
1333 // resize the capacity of the metaspaces. The current implementation
1334 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
1335 // to resize the Java heap by some GC's. New flags can be implemented
1336 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
1337 // free space is desirable in the metaspace capacity to decide how much
1338 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
1339 // free space is desirable in the metaspace capacity before decreasing
1340 // the HWM.
1342 // Calculate the amount to increase the high water mark (HWM).
1343 // Increase by a minimum amount (MinMetaspaceExpansion) so that
1344 // another expansion is not requested too soon. If that is not
1345 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
1346 // If that is still not enough, expand by the size of the allocation
1347 // plus some.
1348 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
1349 size_t min_delta = MinMetaspaceExpansion;
1350 size_t max_delta = MaxMetaspaceExpansion;
1351 size_t delta = align_size_up(bytes, Metaspace::commit_alignment());
1353 if (delta <= min_delta) {
1354 delta = min_delta;
1355 } else if (delta <= max_delta) {
1356 // Don't want to hit the high water mark on the next
1357 // allocation so make the delta greater than just enough
1358 // for this allocation.
1359 delta = max_delta;
1360 } else {
1361 // This allocation is large but the next ones are probably not
1362 // so increase by the minimum.
1363 delta = delta + min_delta;
1364 }
1366 assert_is_size_aligned(delta, Metaspace::commit_alignment());
1368 return delta;
1369 }
1371 size_t MetaspaceGC::capacity_until_GC() {
1372 size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC);
1373 assert(value >= MetaspaceSize, "Not initialied properly?");
1374 return value;
1375 }
1377 size_t MetaspaceGC::inc_capacity_until_GC(size_t v) {
1378 assert_is_size_aligned(v, Metaspace::commit_alignment());
1380 return (size_t)Atomic::add_ptr(v, &_capacity_until_GC);
1381 }
1383 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
1384 assert_is_size_aligned(v, Metaspace::commit_alignment());
1386 return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC);
1387 }
1389 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
1390 // Check if the compressed class space is full.
1391 if (is_class && Metaspace::using_class_space()) {
1392 size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);
1393 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
1394 return false;
1395 }
1396 }
1398 // Check if the user has imposed a limit on the metaspace memory.
1399 size_t committed_bytes = MetaspaceAux::committed_bytes();
1400 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
1401 return false;
1402 }
1404 return true;
1405 }
1407 size_t MetaspaceGC::allowed_expansion() {
1408 size_t committed_bytes = MetaspaceAux::committed_bytes();
1410 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
1412 // Always grant expansion if we are initiating the JVM,
1413 // or if the GC_locker is preventing GCs.
1414 if (!is_init_completed() || GC_locker::is_active_and_needs_gc()) {
1415 return left_until_max / BytesPerWord;
1416 }
1418 size_t capacity_until_gc = capacity_until_GC();
1420 if (capacity_until_gc <= committed_bytes) {
1421 return 0;
1422 }
1424 size_t left_until_GC = capacity_until_gc - committed_bytes;
1425 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
1427 return left_to_commit / BytesPerWord;
1428 }
1430 void MetaspaceGC::compute_new_size() {
1431 assert(_shrink_factor <= 100, "invalid shrink factor");
1432 uint current_shrink_factor = _shrink_factor;
1433 _shrink_factor = 0;
1435 const size_t used_after_gc = MetaspaceAux::allocated_capacity_bytes();
1436 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
1438 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
1439 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
1441 const double min_tmp = used_after_gc / maximum_used_percentage;
1442 size_t minimum_desired_capacity =
1443 (size_t)MIN2(min_tmp, double(max_uintx));
1444 // Don't shrink less than the initial generation size
1445 minimum_desired_capacity = MAX2(minimum_desired_capacity,
1446 MetaspaceSize);
1448 if (PrintGCDetails && Verbose) {
1449 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
1450 gclog_or_tty->print_cr(" "
1451 " minimum_free_percentage: %6.2f"
1452 " maximum_used_percentage: %6.2f",
1453 minimum_free_percentage,
1454 maximum_used_percentage);
1455 gclog_or_tty->print_cr(" "
1456 " used_after_gc : %6.1fKB",
1457 used_after_gc / (double) K);
1458 }
1461 size_t shrink_bytes = 0;
1462 if (capacity_until_GC < minimum_desired_capacity) {
1463 // If we have less capacity below the metaspace HWM, then
1464 // increment the HWM.
1465 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
1466 expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment());
1467 // Don't expand unless it's significant
1468 if (expand_bytes >= MinMetaspaceExpansion) {
1469 MetaspaceGC::inc_capacity_until_GC(expand_bytes);
1470 }
1471 if (PrintGCDetails && Verbose) {
1472 size_t new_capacity_until_GC = capacity_until_GC;
1473 gclog_or_tty->print_cr(" expanding:"
1474 " minimum_desired_capacity: %6.1fKB"
1475 " expand_bytes: %6.1fKB"
1476 " MinMetaspaceExpansion: %6.1fKB"
1477 " new metaspace HWM: %6.1fKB",
1478 minimum_desired_capacity / (double) K,
1479 expand_bytes / (double) K,
1480 MinMetaspaceExpansion / (double) K,
1481 new_capacity_until_GC / (double) K);
1482 }
1483 return;
1484 }
1486 // No expansion, now see if we want to shrink
1487 // We would never want to shrink more than this
1488 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
1489 assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
1490 max_shrink_bytes));
1492 // Should shrinking be considered?
1493 if (MaxMetaspaceFreeRatio < 100) {
1494 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
1495 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
1496 const double max_tmp = used_after_gc / minimum_used_percentage;
1497 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
1498 maximum_desired_capacity = MAX2(maximum_desired_capacity,
1499 MetaspaceSize);
1500 if (PrintGCDetails && Verbose) {
1501 gclog_or_tty->print_cr(" "
1502 " maximum_free_percentage: %6.2f"
1503 " minimum_used_percentage: %6.2f",
1504 maximum_free_percentage,
1505 minimum_used_percentage);
1506 gclog_or_tty->print_cr(" "
1507 " minimum_desired_capacity: %6.1fKB"
1508 " maximum_desired_capacity: %6.1fKB",
1509 minimum_desired_capacity / (double) K,
1510 maximum_desired_capacity / (double) K);
1511 }
1513 assert(minimum_desired_capacity <= maximum_desired_capacity,
1514 "sanity check");
1516 if (capacity_until_GC > maximum_desired_capacity) {
1517 // Capacity too large, compute shrinking size
1518 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
1519 // We don't want shrink all the way back to initSize if people call
1520 // System.gc(), because some programs do that between "phases" and then
1521 // we'd just have to grow the heap up again for the next phase. So we
1522 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
1523 // on the third call, and 100% by the fourth call. But if we recompute
1524 // size without shrinking, it goes back to 0%.
1525 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
1527 shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment());
1529 assert(shrink_bytes <= max_shrink_bytes,
1530 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
1531 shrink_bytes, max_shrink_bytes));
1532 if (current_shrink_factor == 0) {
1533 _shrink_factor = 10;
1534 } else {
1535 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
1536 }
1537 if (PrintGCDetails && Verbose) {
1538 gclog_or_tty->print_cr(" "
1539 " shrinking:"
1540 " initSize: %.1fK"
1541 " maximum_desired_capacity: %.1fK",
1542 MetaspaceSize / (double) K,
1543 maximum_desired_capacity / (double) K);
1544 gclog_or_tty->print_cr(" "
1545 " shrink_bytes: %.1fK"
1546 " current_shrink_factor: %d"
1547 " new shrink factor: %d"
1548 " MinMetaspaceExpansion: %.1fK",
1549 shrink_bytes / (double) K,
1550 current_shrink_factor,
1551 _shrink_factor,
1552 MinMetaspaceExpansion / (double) K);
1553 }
1554 }
1555 }
1557 // Don't shrink unless it's significant
1558 if (shrink_bytes >= MinMetaspaceExpansion &&
1559 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
1560 MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
1561 }
1562 }
1564 // Metadebug methods
1566 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
1567 size_t chunk_word_size){
1568 #ifdef ASSERT
1569 VirtualSpaceList* vsl = sm->vs_list();
1570 if (MetaDataDeallocateALot &&
1571 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
1572 Metadebug::reset_deallocate_chunk_a_lot_count();
1573 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
1574 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
1575 if (dummy_chunk == NULL) {
1576 break;
1577 }
1578 sm->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
1580 if (TraceMetadataChunkAllocation && Verbose) {
1581 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
1582 sm->sum_count_in_chunks_in_use());
1583 dummy_chunk->print_on(gclog_or_tty);
1584 gclog_or_tty->print_cr(" Free chunks total %d count %d",
1585 sm->chunk_manager()->free_chunks_total_words(),
1586 sm->chunk_manager()->free_chunks_count());
1587 }
1588 }
1589 } else {
1590 Metadebug::inc_deallocate_chunk_a_lot_count();
1591 }
1592 #endif
1593 }
1595 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
1596 size_t raw_word_size){
1597 #ifdef ASSERT
1598 if (MetaDataDeallocateALot &&
1599 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
1600 Metadebug::set_deallocate_block_a_lot_count(0);
1601 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
1602 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
1603 if (dummy_block == 0) {
1604 break;
1605 }
1606 sm->deallocate(dummy_block, raw_word_size);
1607 }
1608 } else {
1609 Metadebug::inc_deallocate_block_a_lot_count();
1610 }
1611 #endif
1612 }
1614 void Metadebug::init_allocation_fail_alot_count() {
1615 if (MetadataAllocationFailALot) {
1616 _allocation_fail_alot_count =
1617 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
1618 }
1619 }
1621 #ifdef ASSERT
1622 bool Metadebug::test_metadata_failure() {
1623 if (MetadataAllocationFailALot &&
1624 Threads::is_vm_complete()) {
1625 if (_allocation_fail_alot_count > 0) {
1626 _allocation_fail_alot_count--;
1627 } else {
1628 if (TraceMetadataChunkAllocation && Verbose) {
1629 gclog_or_tty->print_cr("Metadata allocation failing for "
1630 "MetadataAllocationFailALot");
1631 }
1632 init_allocation_fail_alot_count();
1633 return true;
1634 }
1635 }
1636 return false;
1637 }
1638 #endif
1640 // ChunkManager methods
1642 size_t ChunkManager::free_chunks_total_words() {
1643 return _free_chunks_total;
1644 }
1646 size_t ChunkManager::free_chunks_total_bytes() {
1647 return free_chunks_total_words() * BytesPerWord;
1648 }
1650 size_t ChunkManager::free_chunks_count() {
1651 #ifdef ASSERT
1652 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
1653 MutexLockerEx cl(SpaceManager::expand_lock(),
1654 Mutex::_no_safepoint_check_flag);
1655 // This lock is only needed in debug because the verification
1656 // of the _free_chunks_totals walks the list of free chunks
1657 slow_locked_verify_free_chunks_count();
1658 }
1659 #endif
1660 return _free_chunks_count;
1661 }
1663 void ChunkManager::locked_verify_free_chunks_total() {
1664 assert_lock_strong(SpaceManager::expand_lock());
1665 assert(sum_free_chunks() == _free_chunks_total,
1666 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
1667 " same as sum " SIZE_FORMAT, _free_chunks_total,
1668 sum_free_chunks()));
1669 }
1671 void ChunkManager::verify_free_chunks_total() {
1672 MutexLockerEx cl(SpaceManager::expand_lock(),
1673 Mutex::_no_safepoint_check_flag);
1674 locked_verify_free_chunks_total();
1675 }
1677 void ChunkManager::locked_verify_free_chunks_count() {
1678 assert_lock_strong(SpaceManager::expand_lock());
1679 assert(sum_free_chunks_count() == _free_chunks_count,
1680 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
1681 " same as sum " SIZE_FORMAT, _free_chunks_count,
1682 sum_free_chunks_count()));
1683 }
1685 void ChunkManager::verify_free_chunks_count() {
1686 #ifdef ASSERT
1687 MutexLockerEx cl(SpaceManager::expand_lock(),
1688 Mutex::_no_safepoint_check_flag);
1689 locked_verify_free_chunks_count();
1690 #endif
1691 }
1693 void ChunkManager::verify() {
1694 MutexLockerEx cl(SpaceManager::expand_lock(),
1695 Mutex::_no_safepoint_check_flag);
1696 locked_verify();
1697 }
1699 void ChunkManager::locked_verify() {
1700 locked_verify_free_chunks_count();
1701 locked_verify_free_chunks_total();
1702 }
1704 void ChunkManager::locked_print_free_chunks(outputStream* st) {
1705 assert_lock_strong(SpaceManager::expand_lock());
1706 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
1707 _free_chunks_total, _free_chunks_count);
1708 }
1710 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
1711 assert_lock_strong(SpaceManager::expand_lock());
1712 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
1713 sum_free_chunks(), sum_free_chunks_count());
1714 }
1715 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
1716 return &_free_chunks[index];
1717 }
1719 // These methods that sum the free chunk lists are used in printing
1720 // methods that are used in product builds.
1721 size_t ChunkManager::sum_free_chunks() {
1722 assert_lock_strong(SpaceManager::expand_lock());
1723 size_t result = 0;
1724 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
1725 ChunkList* list = free_chunks(i);
1727 if (list == NULL) {
1728 continue;
1729 }
1731 result = result + list->count() * list->size();
1732 }
1733 result = result + humongous_dictionary()->total_size();
1734 return result;
1735 }
1737 size_t ChunkManager::sum_free_chunks_count() {
1738 assert_lock_strong(SpaceManager::expand_lock());
1739 size_t count = 0;
1740 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
1741 ChunkList* list = free_chunks(i);
1742 if (list == NULL) {
1743 continue;
1744 }
1745 count = count + list->count();
1746 }
1747 count = count + humongous_dictionary()->total_free_blocks();
1748 return count;
1749 }
1751 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
1752 ChunkIndex index = list_index(word_size);
1753 assert(index < HumongousIndex, "No humongous list");
1754 return free_chunks(index);
1755 }
1757 void ChunkManager::free_chunks_put(Metachunk* chunk) {
1758 assert_lock_strong(SpaceManager::expand_lock());
1759 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
1760 chunk->set_next(free_list->head());
1761 free_list->set_head(chunk);
1762 // chunk is being returned to the chunk free list
1763 inc_free_chunks_total(chunk->capacity_word_size());
1764 slow_locked_verify();
1765 }
1767 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
1768 // The deallocation of a chunk originates in the freelist
1769 // manangement code for a Metaspace and does not hold the
1770 // lock.
1771 assert(chunk != NULL, "Deallocating NULL");
1772 assert_lock_strong(SpaceManager::expand_lock());
1773 slow_locked_verify();
1774 if (TraceMetadataChunkAllocation) {
1775 gclog_or_tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
1776 PTR_FORMAT " size " SIZE_FORMAT,
1777 chunk, chunk->word_size());
1778 }
1779 free_chunks_put(chunk);
1780 }
1782 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
1783 assert_lock_strong(SpaceManager::expand_lock());
1785 slow_locked_verify();
1787 Metachunk* chunk = NULL;
1788 if (list_index(word_size) != HumongousIndex) {
1789 ChunkList* free_list = find_free_chunks_list(word_size);
1790 assert(free_list != NULL, "Sanity check");
1792 chunk = free_list->head();
1794 if (chunk == NULL) {
1795 return NULL;
1796 }
1798 // Remove the chunk as the head of the list.
1799 free_list->remove_chunk(chunk);
1801 if (TraceMetadataChunkAllocation && Verbose) {
1802 gclog_or_tty->print_cr("ChunkManager::free_chunks_get: free_list "
1803 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
1804 free_list, chunk, chunk->word_size());
1805 }
1806 } else {
1807 chunk = humongous_dictionary()->get_chunk(
1808 word_size,
1809 FreeBlockDictionary<Metachunk>::atLeast);
1811 if (chunk == NULL) {
1812 return NULL;
1813 }
1815 if (TraceMetadataHumongousAllocation) {
1816 size_t waste = chunk->word_size() - word_size;
1817 gclog_or_tty->print_cr("Free list allocate humongous chunk size "
1818 SIZE_FORMAT " for requested size " SIZE_FORMAT
1819 " waste " SIZE_FORMAT,
1820 chunk->word_size(), word_size, waste);
1821 }
1822 }
1824 // Chunk is being removed from the chunks free list.
1825 dec_free_chunks_total(chunk->capacity_word_size());
1827 // Remove it from the links to this freelist
1828 chunk->set_next(NULL);
1829 chunk->set_prev(NULL);
1830 #ifdef ASSERT
1831 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
1832 // work.
1833 chunk->set_is_free(false);
1834 #endif
1835 chunk->container()->inc_container_count();
1837 slow_locked_verify();
1838 return chunk;
1839 }
1841 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
1842 assert_lock_strong(SpaceManager::expand_lock());
1843 slow_locked_verify();
1845 // Take from the beginning of the list
1846 Metachunk* chunk = free_chunks_get(word_size);
1847 if (chunk == NULL) {
1848 return NULL;
1849 }
1851 assert((word_size <= chunk->word_size()) ||
1852 list_index(chunk->word_size() == HumongousIndex),
1853 "Non-humongous variable sized chunk");
1854 if (TraceMetadataChunkAllocation) {
1855 size_t list_count;
1856 if (list_index(word_size) < HumongousIndex) {
1857 ChunkList* list = find_free_chunks_list(word_size);
1858 list_count = list->count();
1859 } else {
1860 list_count = humongous_dictionary()->total_count();
1861 }
1862 gclog_or_tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
1863 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
1864 this, chunk, chunk->word_size(), list_count);
1865 locked_print_free_chunks(gclog_or_tty);
1866 }
1868 return chunk;
1869 }
1871 void ChunkManager::print_on(outputStream* out) const {
1872 if (PrintFLSStatistics != 0) {
1873 const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics();
1874 }
1875 }
1877 // SpaceManager methods
1879 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
1880 size_t* chunk_word_size,
1881 size_t* class_chunk_word_size) {
1882 switch (type) {
1883 case Metaspace::BootMetaspaceType:
1884 *chunk_word_size = Metaspace::first_chunk_word_size();
1885 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
1886 break;
1887 case Metaspace::ROMetaspaceType:
1888 *chunk_word_size = SharedReadOnlySize / wordSize;
1889 *class_chunk_word_size = ClassSpecializedChunk;
1890 break;
1891 case Metaspace::ReadWriteMetaspaceType:
1892 *chunk_word_size = SharedReadWriteSize / wordSize;
1893 *class_chunk_word_size = ClassSpecializedChunk;
1894 break;
1895 case Metaspace::AnonymousMetaspaceType:
1896 case Metaspace::ReflectionMetaspaceType:
1897 *chunk_word_size = SpecializedChunk;
1898 *class_chunk_word_size = ClassSpecializedChunk;
1899 break;
1900 default:
1901 *chunk_word_size = SmallChunk;
1902 *class_chunk_word_size = ClassSmallChunk;
1903 break;
1904 }
1905 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
1906 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
1907 " class " SIZE_FORMAT,
1908 *chunk_word_size, *class_chunk_word_size));
1909 }
1911 size_t SpaceManager::sum_free_in_chunks_in_use() const {
1912 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1913 size_t free = 0;
1914 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1915 Metachunk* chunk = chunks_in_use(i);
1916 while (chunk != NULL) {
1917 free += chunk->free_word_size();
1918 chunk = chunk->next();
1919 }
1920 }
1921 return free;
1922 }
1924 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
1925 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1926 size_t result = 0;
1927 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1928 result += sum_waste_in_chunks_in_use(i);
1929 }
1931 return result;
1932 }
1934 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
1935 size_t result = 0;
1936 Metachunk* chunk = chunks_in_use(index);
1937 // Count the free space in all the chunk but not the
1938 // current chunk from which allocations are still being done.
1939 while (chunk != NULL) {
1940 if (chunk != current_chunk()) {
1941 result += chunk->free_word_size();
1942 }
1943 chunk = chunk->next();
1944 }
1945 return result;
1946 }
1948 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
1949 // For CMS use "allocated_chunks_words()" which does not need the
1950 // Metaspace lock. For the other collectors sum over the
1951 // lists. Use both methods as a check that "allocated_chunks_words()"
1952 // is correct. That is, sum_capacity_in_chunks() is too expensive
1953 // to use in the product and allocated_chunks_words() should be used
1954 // but allow for checking that allocated_chunks_words() returns the same
1955 // value as sum_capacity_in_chunks_in_use() which is the definitive
1956 // answer.
1957 if (UseConcMarkSweepGC) {
1958 return allocated_chunks_words();
1959 } else {
1960 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1961 size_t sum = 0;
1962 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1963 Metachunk* chunk = chunks_in_use(i);
1964 while (chunk != NULL) {
1965 sum += chunk->capacity_word_size();
1966 chunk = chunk->next();
1967 }
1968 }
1969 return sum;
1970 }
1971 }
1973 size_t SpaceManager::sum_count_in_chunks_in_use() {
1974 size_t count = 0;
1975 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1976 count = count + sum_count_in_chunks_in_use(i);
1977 }
1979 return count;
1980 }
1982 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
1983 size_t count = 0;
1984 Metachunk* chunk = chunks_in_use(i);
1985 while (chunk != NULL) {
1986 count++;
1987 chunk = chunk->next();
1988 }
1989 return count;
1990 }
1993 size_t SpaceManager::sum_used_in_chunks_in_use() const {
1994 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1995 size_t used = 0;
1996 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1997 Metachunk* chunk = chunks_in_use(i);
1998 while (chunk != NULL) {
1999 used += chunk->used_word_size();
2000 chunk = chunk->next();
2001 }
2002 }
2003 return used;
2004 }
2006 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
2008 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2009 Metachunk* chunk = chunks_in_use(i);
2010 st->print("SpaceManager: %s " PTR_FORMAT,
2011 chunk_size_name(i), chunk);
2012 if (chunk != NULL) {
2013 st->print_cr(" free " SIZE_FORMAT,
2014 chunk->free_word_size());
2015 } else {
2016 st->print_cr("");
2017 }
2018 }
2020 chunk_manager()->locked_print_free_chunks(st);
2021 chunk_manager()->locked_print_sum_free_chunks(st);
2022 }
2024 size_t SpaceManager::calc_chunk_size(size_t word_size) {
2026 // Decide between a small chunk and a medium chunk. Up to
2027 // _small_chunk_limit small chunks can be allocated but
2028 // once a medium chunk has been allocated, no more small
2029 // chunks will be allocated.
2030 size_t chunk_word_size;
2031 if (chunks_in_use(MediumIndex) == NULL &&
2032 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) {
2033 chunk_word_size = (size_t) small_chunk_size();
2034 if (word_size + Metachunk::overhead() > small_chunk_size()) {
2035 chunk_word_size = medium_chunk_size();
2036 }
2037 } else {
2038 chunk_word_size = medium_chunk_size();
2039 }
2041 // Might still need a humongous chunk. Enforce an
2042 // eight word granularity to facilitate reuse (some
2043 // wastage but better chance of reuse).
2044 size_t if_humongous_sized_chunk =
2045 align_size_up(word_size + Metachunk::overhead(),
2046 HumongousChunkGranularity);
2047 chunk_word_size =
2048 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
2050 assert(!SpaceManager::is_humongous(word_size) ||
2051 chunk_word_size == if_humongous_sized_chunk,
2052 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
2053 " chunk_word_size " SIZE_FORMAT,
2054 word_size, chunk_word_size));
2055 if (TraceMetadataHumongousAllocation &&
2056 SpaceManager::is_humongous(word_size)) {
2057 gclog_or_tty->print_cr("Metadata humongous allocation:");
2058 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
2059 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
2060 chunk_word_size);
2061 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
2062 Metachunk::overhead());
2063 }
2064 return chunk_word_size;
2065 }
2067 void SpaceManager::track_metaspace_memory_usage() {
2068 if (is_init_completed()) {
2069 if (is_class()) {
2070 MemoryService::track_compressed_class_memory_usage();
2071 }
2072 MemoryService::track_metaspace_memory_usage();
2073 }
2074 }
2076 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
2077 assert(vs_list()->current_virtual_space() != NULL,
2078 "Should have been set");
2079 assert(current_chunk() == NULL ||
2080 current_chunk()->allocate(word_size) == NULL,
2081 "Don't need to expand");
2082 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
2084 if (TraceMetadataChunkAllocation && Verbose) {
2085 size_t words_left = 0;
2086 size_t words_used = 0;
2087 if (current_chunk() != NULL) {
2088 words_left = current_chunk()->free_word_size();
2089 words_used = current_chunk()->used_word_size();
2090 }
2091 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
2092 " words " SIZE_FORMAT " words used " SIZE_FORMAT
2093 " words left",
2094 word_size, words_used, words_left);
2095 }
2097 // Get another chunk out of the virtual space
2098 size_t grow_chunks_by_words = calc_chunk_size(word_size);
2099 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
2101 if (next != NULL) {
2102 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
2103 }
2105 MetaWord* mem = NULL;
2107 // If a chunk was available, add it to the in-use chunk list
2108 // and do an allocation from it.
2109 if (next != NULL) {
2110 // Add to this manager's list of chunks in use.
2111 add_chunk(next, false);
2112 mem = next->allocate(word_size);
2113 }
2115 // Track metaspace memory usage statistic.
2116 track_metaspace_memory_usage();
2118 return mem;
2119 }
2121 void SpaceManager::print_on(outputStream* st) const {
2123 for (ChunkIndex i = ZeroIndex;
2124 i < NumberOfInUseLists ;
2125 i = next_chunk_index(i) ) {
2126 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
2127 chunks_in_use(i),
2128 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
2129 }
2130 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
2131 " Humongous " SIZE_FORMAT,
2132 sum_waste_in_chunks_in_use(SmallIndex),
2133 sum_waste_in_chunks_in_use(MediumIndex),
2134 sum_waste_in_chunks_in_use(HumongousIndex));
2135 // block free lists
2136 if (block_freelists() != NULL) {
2137 st->print_cr("total in block free lists " SIZE_FORMAT,
2138 block_freelists()->total_size());
2139 }
2140 }
2142 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
2143 Mutex* lock) :
2144 _mdtype(mdtype),
2145 _allocated_blocks_words(0),
2146 _allocated_chunks_words(0),
2147 _allocated_chunks_count(0),
2148 _lock(lock)
2149 {
2150 initialize();
2151 }
2153 void SpaceManager::inc_size_metrics(size_t words) {
2154 assert_lock_strong(SpaceManager::expand_lock());
2155 // Total of allocated Metachunks and allocated Metachunks count
2156 // for each SpaceManager
2157 _allocated_chunks_words = _allocated_chunks_words + words;
2158 _allocated_chunks_count++;
2159 // Global total of capacity in allocated Metachunks
2160 MetaspaceAux::inc_capacity(mdtype(), words);
2161 // Global total of allocated Metablocks.
2162 // used_words_slow() includes the overhead in each
2163 // Metachunk so include it in the used when the
2164 // Metachunk is first added (so only added once per
2165 // Metachunk).
2166 MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
2167 }
2169 void SpaceManager::inc_used_metrics(size_t words) {
2170 // Add to the per SpaceManager total
2171 Atomic::add_ptr(words, &_allocated_blocks_words);
2172 // Add to the global total
2173 MetaspaceAux::inc_used(mdtype(), words);
2174 }
2176 void SpaceManager::dec_total_from_size_metrics() {
2177 MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
2178 MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
2179 // Also deduct the overhead per Metachunk
2180 MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
2181 }
2183 void SpaceManager::initialize() {
2184 Metadebug::init_allocation_fail_alot_count();
2185 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2186 _chunks_in_use[i] = NULL;
2187 }
2188 _current_chunk = NULL;
2189 if (TraceMetadataChunkAllocation && Verbose) {
2190 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
2191 }
2192 }
2194 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
2195 if (chunks == NULL) {
2196 return;
2197 }
2198 ChunkList* list = free_chunks(index);
2199 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
2200 assert_lock_strong(SpaceManager::expand_lock());
2201 Metachunk* cur = chunks;
2203 // This returns chunks one at a time. If a new
2204 // class List can be created that is a base class
2205 // of FreeList then something like FreeList::prepend()
2206 // can be used in place of this loop
2207 while (cur != NULL) {
2208 assert(cur->container() != NULL, "Container should have been set");
2209 cur->container()->dec_container_count();
2210 // Capture the next link before it is changed
2211 // by the call to return_chunk_at_head();
2212 Metachunk* next = cur->next();
2213 cur->set_is_free(true);
2214 list->return_chunk_at_head(cur);
2215 cur = next;
2216 }
2217 }
2219 SpaceManager::~SpaceManager() {
2220 // This call this->_lock which can't be done while holding expand_lock()
2221 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
2222 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
2223 " allocated_chunks_words() " SIZE_FORMAT,
2224 sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
2226 MutexLockerEx fcl(SpaceManager::expand_lock(),
2227 Mutex::_no_safepoint_check_flag);
2229 chunk_manager()->slow_locked_verify();
2231 dec_total_from_size_metrics();
2233 if (TraceMetadataChunkAllocation && Verbose) {
2234 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
2235 locked_print_chunks_in_use_on(gclog_or_tty);
2236 }
2238 // Do not mangle freed Metachunks. The chunk size inside Metachunks
2239 // is during the freeing of a VirtualSpaceNodes.
2241 // Have to update before the chunks_in_use lists are emptied
2242 // below.
2243 chunk_manager()->inc_free_chunks_total(allocated_chunks_words(),
2244 sum_count_in_chunks_in_use());
2246 // Add all the chunks in use by this space manager
2247 // to the global list of free chunks.
2249 // Follow each list of chunks-in-use and add them to the
2250 // free lists. Each list is NULL terminated.
2252 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
2253 if (TraceMetadataChunkAllocation && Verbose) {
2254 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
2255 sum_count_in_chunks_in_use(i),
2256 chunk_size_name(i));
2257 }
2258 Metachunk* chunks = chunks_in_use(i);
2259 chunk_manager()->return_chunks(i, chunks);
2260 set_chunks_in_use(i, NULL);
2261 if (TraceMetadataChunkAllocation && Verbose) {
2262 gclog_or_tty->print_cr("updated freelist count %d %s",
2263 chunk_manager()->free_chunks(i)->count(),
2264 chunk_size_name(i));
2265 }
2266 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
2267 }
2269 // The medium chunk case may be optimized by passing the head and
2270 // tail of the medium chunk list to add_at_head(). The tail is often
2271 // the current chunk but there are probably exceptions.
2273 // Humongous chunks
2274 if (TraceMetadataChunkAllocation && Verbose) {
2275 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
2276 sum_count_in_chunks_in_use(HumongousIndex),
2277 chunk_size_name(HumongousIndex));
2278 gclog_or_tty->print("Humongous chunk dictionary: ");
2279 }
2280 // Humongous chunks are never the current chunk.
2281 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
2283 while (humongous_chunks != NULL) {
2284 #ifdef ASSERT
2285 humongous_chunks->set_is_free(true);
2286 #endif
2287 if (TraceMetadataChunkAllocation && Verbose) {
2288 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
2289 humongous_chunks,
2290 humongous_chunks->word_size());
2291 }
2292 assert(humongous_chunks->word_size() == (size_t)
2293 align_size_up(humongous_chunks->word_size(),
2294 HumongousChunkGranularity),
2295 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
2296 " granularity %d",
2297 humongous_chunks->word_size(), HumongousChunkGranularity));
2298 Metachunk* next_humongous_chunks = humongous_chunks->next();
2299 humongous_chunks->container()->dec_container_count();
2300 chunk_manager()->humongous_dictionary()->return_chunk(humongous_chunks);
2301 humongous_chunks = next_humongous_chunks;
2302 }
2303 if (TraceMetadataChunkAllocation && Verbose) {
2304 gclog_or_tty->print_cr("");
2305 gclog_or_tty->print_cr("updated dictionary count %d %s",
2306 chunk_manager()->humongous_dictionary()->total_count(),
2307 chunk_size_name(HumongousIndex));
2308 }
2309 chunk_manager()->slow_locked_verify();
2310 }
2312 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
2313 switch (index) {
2314 case SpecializedIndex:
2315 return "Specialized";
2316 case SmallIndex:
2317 return "Small";
2318 case MediumIndex:
2319 return "Medium";
2320 case HumongousIndex:
2321 return "Humongous";
2322 default:
2323 return NULL;
2324 }
2325 }
2327 ChunkIndex ChunkManager::list_index(size_t size) {
2328 switch (size) {
2329 case SpecializedChunk:
2330 assert(SpecializedChunk == ClassSpecializedChunk,
2331 "Need branch for ClassSpecializedChunk");
2332 return SpecializedIndex;
2333 case SmallChunk:
2334 case ClassSmallChunk:
2335 return SmallIndex;
2336 case MediumChunk:
2337 case ClassMediumChunk:
2338 return MediumIndex;
2339 default:
2340 assert(size > MediumChunk || size > ClassMediumChunk,
2341 "Not a humongous chunk");
2342 return HumongousIndex;
2343 }
2344 }
2346 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
2347 assert_lock_strong(_lock);
2348 size_t raw_word_size = get_raw_word_size(word_size);
2349 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
2350 assert(raw_word_size >= min_size,
2351 err_msg("Should not deallocate dark matter " SIZE_FORMAT "<" SIZE_FORMAT, word_size, min_size));
2352 block_freelists()->return_block(p, raw_word_size);
2353 }
2355 // Adds a chunk to the list of chunks in use.
2356 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
2358 assert(new_chunk != NULL, "Should not be NULL");
2359 assert(new_chunk->next() == NULL, "Should not be on a list");
2361 new_chunk->reset_empty();
2363 // Find the correct list and and set the current
2364 // chunk for that list.
2365 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
2367 if (index != HumongousIndex) {
2368 retire_current_chunk();
2369 set_current_chunk(new_chunk);
2370 new_chunk->set_next(chunks_in_use(index));
2371 set_chunks_in_use(index, new_chunk);
2372 } else {
2373 // For null class loader data and DumpSharedSpaces, the first chunk isn't
2374 // small, so small will be null. Link this first chunk as the current
2375 // chunk.
2376 if (make_current) {
2377 // Set as the current chunk but otherwise treat as a humongous chunk.
2378 set_current_chunk(new_chunk);
2379 }
2380 // Link at head. The _current_chunk only points to a humongous chunk for
2381 // the null class loader metaspace (class and data virtual space managers)
2382 // any humongous chunks so will not point to the tail
2383 // of the humongous chunks list.
2384 new_chunk->set_next(chunks_in_use(HumongousIndex));
2385 set_chunks_in_use(HumongousIndex, new_chunk);
2387 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
2388 }
2390 // Add to the running sum of capacity
2391 inc_size_metrics(new_chunk->word_size());
2393 assert(new_chunk->is_empty(), "Not ready for reuse");
2394 if (TraceMetadataChunkAllocation && Verbose) {
2395 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
2396 sum_count_in_chunks_in_use());
2397 new_chunk->print_on(gclog_or_tty);
2398 chunk_manager()->locked_print_free_chunks(gclog_or_tty);
2399 }
2400 }
2402 void SpaceManager::retire_current_chunk() {
2403 if (current_chunk() != NULL) {
2404 size_t remaining_words = current_chunk()->free_word_size();
2405 if (remaining_words >= TreeChunk<Metablock, FreeList>::min_size()) {
2406 block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words);
2407 inc_used_metrics(remaining_words);
2408 }
2409 }
2410 }
2412 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
2413 size_t grow_chunks_by_words) {
2414 // Get a chunk from the chunk freelist
2415 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
2417 if (next == NULL) {
2418 next = vs_list()->get_new_chunk(word_size,
2419 grow_chunks_by_words,
2420 medium_chunk_bunch());
2421 }
2423 if (TraceMetadataHumongousAllocation && next != NULL &&
2424 SpaceManager::is_humongous(next->word_size())) {
2425 gclog_or_tty->print_cr(" new humongous chunk word size "
2426 PTR_FORMAT, next->word_size());
2427 }
2429 return next;
2430 }
2432 MetaWord* SpaceManager::allocate(size_t word_size) {
2433 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
2435 size_t raw_word_size = get_raw_word_size(word_size);
2436 BlockFreelist* fl = block_freelists();
2437 MetaWord* p = NULL;
2438 // Allocation from the dictionary is expensive in the sense that
2439 // the dictionary has to be searched for a size. Don't allocate
2440 // from the dictionary until it starts to get fat. Is this
2441 // a reasonable policy? Maybe an skinny dictionary is fast enough
2442 // for allocations. Do some profiling. JJJ
2443 if (fl->total_size() > allocation_from_dictionary_limit) {
2444 p = fl->get_block(raw_word_size);
2445 }
2446 if (p == NULL) {
2447 p = allocate_work(raw_word_size);
2448 }
2449 Metadebug::deallocate_block_a_lot(this, raw_word_size);
2451 return p;
2452 }
2454 // Returns the address of spaced allocated for "word_size".
2455 // This methods does not know about blocks (Metablocks)
2456 MetaWord* SpaceManager::allocate_work(size_t word_size) {
2457 assert_lock_strong(_lock);
2458 #ifdef ASSERT
2459 if (Metadebug::test_metadata_failure()) {
2460 return NULL;
2461 }
2462 #endif
2463 // Is there space in the current chunk?
2464 MetaWord* result = NULL;
2466 // For DumpSharedSpaces, only allocate out of the current chunk which is
2467 // never null because we gave it the size we wanted. Caller reports out
2468 // of memory if this returns null.
2469 if (DumpSharedSpaces) {
2470 assert(current_chunk() != NULL, "should never happen");
2471 inc_used_metrics(word_size);
2472 return current_chunk()->allocate(word_size); // caller handles null result
2473 }
2475 if (current_chunk() != NULL) {
2476 result = current_chunk()->allocate(word_size);
2477 }
2479 if (result == NULL) {
2480 result = grow_and_allocate(word_size);
2481 }
2483 if (result != NULL) {
2484 inc_used_metrics(word_size);
2485 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
2486 "Head of the list is being allocated");
2487 }
2489 return result;
2490 }
2492 void SpaceManager::verify() {
2493 // If there are blocks in the dictionary, then
2494 // verfication of chunks does not work since
2495 // being in the dictionary alters a chunk.
2496 if (block_freelists()->total_size() == 0) {
2497 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2498 Metachunk* curr = chunks_in_use(i);
2499 while (curr != NULL) {
2500 curr->verify();
2501 verify_chunk_size(curr);
2502 curr = curr->next();
2503 }
2504 }
2505 }
2506 }
2508 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
2509 assert(is_humongous(chunk->word_size()) ||
2510 chunk->word_size() == medium_chunk_size() ||
2511 chunk->word_size() == small_chunk_size() ||
2512 chunk->word_size() == specialized_chunk_size(),
2513 "Chunk size is wrong");
2514 return;
2515 }
2517 #ifdef ASSERT
2518 void SpaceManager::verify_allocated_blocks_words() {
2519 // Verification is only guaranteed at a safepoint.
2520 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
2521 "Verification can fail if the applications is running");
2522 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
2523 err_msg("allocation total is not consistent " SIZE_FORMAT
2524 " vs " SIZE_FORMAT,
2525 allocated_blocks_words(), sum_used_in_chunks_in_use()));
2526 }
2528 #endif
2530 void SpaceManager::dump(outputStream* const out) const {
2531 size_t curr_total = 0;
2532 size_t waste = 0;
2533 uint i = 0;
2534 size_t used = 0;
2535 size_t capacity = 0;
2537 // Add up statistics for all chunks in this SpaceManager.
2538 for (ChunkIndex index = ZeroIndex;
2539 index < NumberOfInUseLists;
2540 index = next_chunk_index(index)) {
2541 for (Metachunk* curr = chunks_in_use(index);
2542 curr != NULL;
2543 curr = curr->next()) {
2544 out->print("%d) ", i++);
2545 curr->print_on(out);
2546 curr_total += curr->word_size();
2547 used += curr->used_word_size();
2548 capacity += curr->capacity_word_size();
2549 waste += curr->free_word_size() + curr->overhead();;
2550 }
2551 }
2553 if (TraceMetadataChunkAllocation && Verbose) {
2554 block_freelists()->print_on(out);
2555 }
2557 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
2558 // Free space isn't wasted.
2559 waste -= free;
2561 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
2562 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
2563 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
2564 }
2566 #ifndef PRODUCT
2567 void SpaceManager::mangle_freed_chunks() {
2568 for (ChunkIndex index = ZeroIndex;
2569 index < NumberOfInUseLists;
2570 index = next_chunk_index(index)) {
2571 for (Metachunk* curr = chunks_in_use(index);
2572 curr != NULL;
2573 curr = curr->next()) {
2574 curr->mangle();
2575 }
2576 }
2577 }
2578 #endif // PRODUCT
2580 // MetaspaceAux
2583 size_t MetaspaceAux::_allocated_capacity_words[] = {0, 0};
2584 size_t MetaspaceAux::_allocated_used_words[] = {0, 0};
2586 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
2587 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2588 return list == NULL ? 0 : list->free_bytes();
2589 }
2591 size_t MetaspaceAux::free_bytes() {
2592 return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
2593 }
2595 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
2596 assert_lock_strong(SpaceManager::expand_lock());
2597 assert(words <= allocated_capacity_words(mdtype),
2598 err_msg("About to decrement below 0: words " SIZE_FORMAT
2599 " is greater than _allocated_capacity_words[%u] " SIZE_FORMAT,
2600 words, mdtype, allocated_capacity_words(mdtype)));
2601 _allocated_capacity_words[mdtype] -= words;
2602 }
2604 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
2605 assert_lock_strong(SpaceManager::expand_lock());
2606 // Needs to be atomic
2607 _allocated_capacity_words[mdtype] += words;
2608 }
2610 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
2611 assert(words <= allocated_used_words(mdtype),
2612 err_msg("About to decrement below 0: words " SIZE_FORMAT
2613 " is greater than _allocated_used_words[%u] " SIZE_FORMAT,
2614 words, mdtype, allocated_used_words(mdtype)));
2615 // For CMS deallocation of the Metaspaces occurs during the
2616 // sweep which is a concurrent phase. Protection by the expand_lock()
2617 // is not enough since allocation is on a per Metaspace basis
2618 // and protected by the Metaspace lock.
2619 jlong minus_words = (jlong) - (jlong) words;
2620 Atomic::add_ptr(minus_words, &_allocated_used_words[mdtype]);
2621 }
2623 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
2624 // _allocated_used_words tracks allocations for
2625 // each piece of metadata. Those allocations are
2626 // generally done concurrently by different application
2627 // threads so must be done atomically.
2628 Atomic::add_ptr(words, &_allocated_used_words[mdtype]);
2629 }
2631 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
2632 size_t used = 0;
2633 ClassLoaderDataGraphMetaspaceIterator iter;
2634 while (iter.repeat()) {
2635 Metaspace* msp = iter.get_next();
2636 // Sum allocated_blocks_words for each metaspace
2637 if (msp != NULL) {
2638 used += msp->used_words_slow(mdtype);
2639 }
2640 }
2641 return used * BytesPerWord;
2642 }
2644 size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) {
2645 size_t free = 0;
2646 ClassLoaderDataGraphMetaspaceIterator iter;
2647 while (iter.repeat()) {
2648 Metaspace* msp = iter.get_next();
2649 if (msp != NULL) {
2650 free += msp->free_words_slow(mdtype);
2651 }
2652 }
2653 return free * BytesPerWord;
2654 }
2656 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
2657 if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
2658 return 0;
2659 }
2660 // Don't count the space in the freelists. That space will be
2661 // added to the capacity calculation as needed.
2662 size_t capacity = 0;
2663 ClassLoaderDataGraphMetaspaceIterator iter;
2664 while (iter.repeat()) {
2665 Metaspace* msp = iter.get_next();
2666 if (msp != NULL) {
2667 capacity += msp->capacity_words_slow(mdtype);
2668 }
2669 }
2670 return capacity * BytesPerWord;
2671 }
2673 size_t MetaspaceAux::capacity_bytes_slow() {
2674 #ifdef PRODUCT
2675 // Use allocated_capacity_bytes() in PRODUCT instead of this function.
2676 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
2677 #endif
2678 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
2679 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
2680 assert(allocated_capacity_bytes() == class_capacity + non_class_capacity,
2681 err_msg("bad accounting: allocated_capacity_bytes() " SIZE_FORMAT
2682 " class_capacity + non_class_capacity " SIZE_FORMAT
2683 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
2684 allocated_capacity_bytes(), class_capacity + non_class_capacity,
2685 class_capacity, non_class_capacity));
2687 return class_capacity + non_class_capacity;
2688 }
2690 size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) {
2691 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2692 return list == NULL ? 0 : list->reserved_bytes();
2693 }
2695 size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) {
2696 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2697 return list == NULL ? 0 : list->committed_bytes();
2698 }
2700 size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
2702 size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) {
2703 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
2704 if (chunk_manager == NULL) {
2705 return 0;
2706 }
2707 chunk_manager->slow_verify();
2708 return chunk_manager->free_chunks_total_words();
2709 }
2711 size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
2712 return free_chunks_total_words(mdtype) * BytesPerWord;
2713 }
2715 size_t MetaspaceAux::free_chunks_total_words() {
2716 return free_chunks_total_words(Metaspace::ClassType) +
2717 free_chunks_total_words(Metaspace::NonClassType);
2718 }
2720 size_t MetaspaceAux::free_chunks_total_bytes() {
2721 return free_chunks_total_words() * BytesPerWord;
2722 }
2724 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
2725 gclog_or_tty->print(", [Metaspace:");
2726 if (PrintGCDetails && Verbose) {
2727 gclog_or_tty->print(" " SIZE_FORMAT
2728 "->" SIZE_FORMAT
2729 "(" SIZE_FORMAT ")",
2730 prev_metadata_used,
2731 allocated_used_bytes(),
2732 reserved_bytes());
2733 } else {
2734 gclog_or_tty->print(" " SIZE_FORMAT "K"
2735 "->" SIZE_FORMAT "K"
2736 "(" SIZE_FORMAT "K)",
2737 prev_metadata_used/K,
2738 allocated_used_bytes()/K,
2739 reserved_bytes()/K);
2740 }
2742 gclog_or_tty->print("]");
2743 }
2745 // This is printed when PrintGCDetails
2746 void MetaspaceAux::print_on(outputStream* out) {
2747 Metaspace::MetadataType nct = Metaspace::NonClassType;
2749 out->print_cr(" Metaspace "
2750 "used " SIZE_FORMAT "K, "
2751 "capacity " SIZE_FORMAT "K, "
2752 "committed " SIZE_FORMAT "K, "
2753 "reserved " SIZE_FORMAT "K",
2754 allocated_used_bytes()/K,
2755 allocated_capacity_bytes()/K,
2756 committed_bytes()/K,
2757 reserved_bytes()/K);
2759 if (Metaspace::using_class_space()) {
2760 Metaspace::MetadataType ct = Metaspace::ClassType;
2761 out->print_cr(" class space "
2762 "used " SIZE_FORMAT "K, "
2763 "capacity " SIZE_FORMAT "K, "
2764 "committed " SIZE_FORMAT "K, "
2765 "reserved " SIZE_FORMAT "K",
2766 allocated_used_bytes(ct)/K,
2767 allocated_capacity_bytes(ct)/K,
2768 committed_bytes(ct)/K,
2769 reserved_bytes(ct)/K);
2770 }
2771 }
2773 // Print information for class space and data space separately.
2774 // This is almost the same as above.
2775 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
2776 size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
2777 size_t capacity_bytes = capacity_bytes_slow(mdtype);
2778 size_t used_bytes = used_bytes_slow(mdtype);
2779 size_t free_bytes = free_bytes_slow(mdtype);
2780 size_t used_and_free = used_bytes + free_bytes +
2781 free_chunks_capacity_bytes;
2782 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
2783 "K + unused in chunks " SIZE_FORMAT "K + "
2784 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
2785 "K capacity in allocated chunks " SIZE_FORMAT "K",
2786 used_bytes / K,
2787 free_bytes / K,
2788 free_chunks_capacity_bytes / K,
2789 used_and_free / K,
2790 capacity_bytes / K);
2791 // Accounting can only be correct if we got the values during a safepoint
2792 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
2793 }
2795 // Print total fragmentation for class metaspaces
2796 void MetaspaceAux::print_class_waste(outputStream* out) {
2797 assert(Metaspace::using_class_space(), "class metaspace not used");
2798 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
2799 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
2800 ClassLoaderDataGraphMetaspaceIterator iter;
2801 while (iter.repeat()) {
2802 Metaspace* msp = iter.get_next();
2803 if (msp != NULL) {
2804 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
2805 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
2806 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
2807 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
2808 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
2809 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
2810 cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
2811 }
2812 }
2813 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
2814 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
2815 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
2816 "large count " SIZE_FORMAT,
2817 cls_specialized_count, cls_specialized_waste,
2818 cls_small_count, cls_small_waste,
2819 cls_medium_count, cls_medium_waste, cls_humongous_count);
2820 }
2822 // Print total fragmentation for data and class metaspaces separately
2823 void MetaspaceAux::print_waste(outputStream* out) {
2824 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
2825 size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
2827 ClassLoaderDataGraphMetaspaceIterator iter;
2828 while (iter.repeat()) {
2829 Metaspace* msp = iter.get_next();
2830 if (msp != NULL) {
2831 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
2832 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
2833 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
2834 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
2835 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
2836 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
2837 humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
2838 }
2839 }
2840 out->print_cr("Total fragmentation waste (words) doesn't count free space");
2841 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
2842 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
2843 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
2844 "large count " SIZE_FORMAT,
2845 specialized_count, specialized_waste, small_count,
2846 small_waste, medium_count, medium_waste, humongous_count);
2847 if (Metaspace::using_class_space()) {
2848 print_class_waste(out);
2849 }
2850 }
2852 // Dump global metaspace things from the end of ClassLoaderDataGraph
2853 void MetaspaceAux::dump(outputStream* out) {
2854 out->print_cr("All Metaspace:");
2855 out->print("data space: "); print_on(out, Metaspace::NonClassType);
2856 out->print("class space: "); print_on(out, Metaspace::ClassType);
2857 print_waste(out);
2858 }
2860 void MetaspaceAux::verify_free_chunks() {
2861 Metaspace::chunk_manager_metadata()->verify();
2862 if (Metaspace::using_class_space()) {
2863 Metaspace::chunk_manager_class()->verify();
2864 }
2865 }
2867 void MetaspaceAux::verify_capacity() {
2868 #ifdef ASSERT
2869 size_t running_sum_capacity_bytes = allocated_capacity_bytes();
2870 // For purposes of the running sum of capacity, verify against capacity
2871 size_t capacity_in_use_bytes = capacity_bytes_slow();
2872 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
2873 err_msg("allocated_capacity_words() * BytesPerWord " SIZE_FORMAT
2874 " capacity_bytes_slow()" SIZE_FORMAT,
2875 running_sum_capacity_bytes, capacity_in_use_bytes));
2876 for (Metaspace::MetadataType i = Metaspace::ClassType;
2877 i < Metaspace:: MetadataTypeCount;
2878 i = (Metaspace::MetadataType)(i + 1)) {
2879 size_t capacity_in_use_bytes = capacity_bytes_slow(i);
2880 assert(allocated_capacity_bytes(i) == capacity_in_use_bytes,
2881 err_msg("allocated_capacity_bytes(%u) " SIZE_FORMAT
2882 " capacity_bytes_slow(%u)" SIZE_FORMAT,
2883 i, allocated_capacity_bytes(i), i, capacity_in_use_bytes));
2884 }
2885 #endif
2886 }
2888 void MetaspaceAux::verify_used() {
2889 #ifdef ASSERT
2890 size_t running_sum_used_bytes = allocated_used_bytes();
2891 // For purposes of the running sum of used, verify against used
2892 size_t used_in_use_bytes = used_bytes_slow();
2893 assert(allocated_used_bytes() == used_in_use_bytes,
2894 err_msg("allocated_used_bytes() " SIZE_FORMAT
2895 " used_bytes_slow()" SIZE_FORMAT,
2896 allocated_used_bytes(), used_in_use_bytes));
2897 for (Metaspace::MetadataType i = Metaspace::ClassType;
2898 i < Metaspace:: MetadataTypeCount;
2899 i = (Metaspace::MetadataType)(i + 1)) {
2900 size_t used_in_use_bytes = used_bytes_slow(i);
2901 assert(allocated_used_bytes(i) == used_in_use_bytes,
2902 err_msg("allocated_used_bytes(%u) " SIZE_FORMAT
2903 " used_bytes_slow(%u)" SIZE_FORMAT,
2904 i, allocated_used_bytes(i), i, used_in_use_bytes));
2905 }
2906 #endif
2907 }
2909 void MetaspaceAux::verify_metrics() {
2910 verify_capacity();
2911 verify_used();
2912 }
2915 // Metaspace methods
2917 size_t Metaspace::_first_chunk_word_size = 0;
2918 size_t Metaspace::_first_class_chunk_word_size = 0;
2920 size_t Metaspace::_commit_alignment = 0;
2921 size_t Metaspace::_reserve_alignment = 0;
2923 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
2924 initialize(lock, type);
2925 }
2927 Metaspace::~Metaspace() {
2928 delete _vsm;
2929 if (using_class_space()) {
2930 delete _class_vsm;
2931 }
2932 }
2934 VirtualSpaceList* Metaspace::_space_list = NULL;
2935 VirtualSpaceList* Metaspace::_class_space_list = NULL;
2937 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
2938 ChunkManager* Metaspace::_chunk_manager_class = NULL;
2940 #define VIRTUALSPACEMULTIPLIER 2
2942 #ifdef _LP64
2943 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
2944 // Figure out the narrow_klass_base and the narrow_klass_shift. The
2945 // narrow_klass_base is the lower of the metaspace base and the cds base
2946 // (if cds is enabled). The narrow_klass_shift depends on the distance
2947 // between the lower base and higher address.
2948 address lower_base;
2949 address higher_address;
2950 if (UseSharedSpaces) {
2951 higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
2952 (address)(metaspace_base + class_metaspace_size()));
2953 lower_base = MIN2(metaspace_base, cds_base);
2954 } else {
2955 higher_address = metaspace_base + class_metaspace_size();
2956 lower_base = metaspace_base;
2957 }
2958 Universe::set_narrow_klass_base(lower_base);
2959 if ((uint64_t)(higher_address - lower_base) < (uint64_t)max_juint) {
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 }
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 + class_metaspace_size()));
2975 return ((uint64_t)(higher_address - lower_base) < (uint64_t)max_juint);
2976 }
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(class_metaspace_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(class_metaspace_size(), _reserve_alignment);
2988 // Don't use large pages for the class space.
2989 bool large_pages = false;
2991 ReservedSpace metaspace_rs = ReservedSpace(class_metaspace_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);
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(class_metaspace_size(),
3007 _reserve_alignment, large_pages, addr, 0);
3008 }
3009 }
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(class_metaspace_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 class_metaspace_size()));
3022 }
3023 }
3024 }
3026 // If we got here then the metaspace got allocated.
3027 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
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 }
3035 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
3036 UseSharedSpaces ? (address)cds_base : 0);
3038 initialize_class_space(metaspace_rs);
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("Metaspace Size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
3044 class_metaspace_size(), metaspace_rs.base(), requested_addr);
3045 }
3046 }
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);
3058 if (!_class_space_list->initialization_succeeded()) {
3059 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
3060 }
3061 }
3063 #endif
3065 // Align down. If the aligning result in 0, return 'alignment'.
3066 static size_t restricted_align_down(size_t size, size_t alignment) {
3067 return MAX2(alignment, align_size_down_(size, alignment));
3068 }
3070 void Metaspace::ergo_initialize() {
3071 if (DumpSharedSpaces) {
3072 // Using large pages when dumping the shared archive is currently not implemented.
3073 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
3074 }
3076 size_t page_size = os::vm_page_size();
3077 if (UseLargePages && UseLargePagesInMetaspace) {
3078 page_size = os::large_page_size();
3079 }
3081 _commit_alignment = page_size;
3082 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
3084 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
3085 // override if MaxMetaspaceSize was set on the command line or not.
3086 // This information is needed later to conform to the specification of the
3087 // java.lang.management.MemoryUsage API.
3088 //
3089 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
3090 // globals.hpp to the aligned value, but this is not possible, since the
3091 // alignment depends on other flags being parsed.
3092 MaxMetaspaceSize = restricted_align_down(MaxMetaspaceSize, _reserve_alignment);
3094 if (MetaspaceSize > MaxMetaspaceSize) {
3095 MetaspaceSize = MaxMetaspaceSize;
3096 }
3098 MetaspaceSize = restricted_align_down(MetaspaceSize, _commit_alignment);
3100 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
3102 if (MetaspaceSize < 256*K) {
3103 vm_exit_during_initialization("Too small initial Metaspace size");
3104 }
3106 MinMetaspaceExpansion = restricted_align_down(MinMetaspaceExpansion, _commit_alignment);
3107 MaxMetaspaceExpansion = restricted_align_down(MaxMetaspaceExpansion, _commit_alignment);
3109 CompressedClassSpaceSize = restricted_align_down(CompressedClassSpaceSize, _reserve_alignment);
3110 set_class_metaspace_size(CompressedClassSpaceSize);
3111 }
3113 void Metaspace::global_initialize() {
3114 // Initialize the alignment for shared spaces.
3115 int max_alignment = os::vm_page_size();
3116 size_t cds_total = 0;
3118 MetaspaceShared::set_max_alignment(max_alignment);
3120 if (DumpSharedSpaces) {
3121 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
3122 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
3123 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
3124 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
3126 // Initialize with the sum of the shared space sizes. The read-only
3127 // and read write metaspace chunks will be allocated out of this and the
3128 // remainder is the misc code and data chunks.
3129 cds_total = FileMapInfo::shared_spaces_size();
3130 cds_total = align_size_up(cds_total, _reserve_alignment);
3131 _space_list = new VirtualSpaceList(cds_total/wordSize);
3132 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
3134 if (!_space_list->initialization_succeeded()) {
3135 vm_exit_during_initialization("Unable to dump shared archive.", NULL);
3136 }
3138 #ifdef _LP64
3139 if (cds_total + class_metaspace_size() > (uint64_t)max_juint) {
3140 vm_exit_during_initialization("Unable to dump shared archive.",
3141 err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space ("
3142 SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed "
3143 "klass limit: " SIZE_FORMAT, cds_total, class_metaspace_size(),
3144 cds_total + class_metaspace_size(), (size_t)max_juint));
3145 }
3147 // Set the compressed klass pointer base so that decoding of these pointers works
3148 // properly when creating the shared archive.
3149 assert(UseCompressedOops && UseCompressedClassPointers,
3150 "UseCompressedOops and UseCompressedClassPointers must be set");
3151 Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom());
3152 if (TraceMetavirtualspaceAllocation && Verbose) {
3153 gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT,
3154 _space_list->current_virtual_space()->bottom());
3155 }
3157 Universe::set_narrow_klass_shift(0);
3158 #endif
3160 } else {
3161 // If using shared space, open the file that contains the shared space
3162 // and map in the memory before initializing the rest of metaspace (so
3163 // the addresses don't conflict)
3164 address cds_address = NULL;
3165 if (UseSharedSpaces) {
3166 FileMapInfo* mapinfo = new FileMapInfo();
3167 memset(mapinfo, 0, sizeof(FileMapInfo));
3169 // Open the shared archive file, read and validate the header. If
3170 // initialization fails, shared spaces [UseSharedSpaces] are
3171 // disabled and the file is closed.
3172 // Map in spaces now also
3173 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
3174 FileMapInfo::set_current_info(mapinfo);
3175 cds_total = FileMapInfo::shared_spaces_size();
3176 cds_address = (address)mapinfo->region_base(0);
3177 } else {
3178 assert(!mapinfo->is_open() && !UseSharedSpaces,
3179 "archive file not closed or shared spaces not disabled.");
3180 }
3181 }
3183 #ifdef _LP64
3184 // If UseCompressedClassPointers is set then allocate the metaspace area
3185 // above the heap and above the CDS area (if it exists).
3186 if (using_class_space()) {
3187 if (UseSharedSpaces) {
3188 char* cds_end = (char*)(cds_address + cds_total);
3189 cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
3190 allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
3191 } else {
3192 allocate_metaspace_compressed_klass_ptrs((char *)CompressedKlassPointersBase, 0);
3193 }
3194 }
3195 #endif
3197 // Initialize these before initializing the VirtualSpaceList
3198 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
3199 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
3200 // Make the first class chunk bigger than a medium chunk so it's not put
3201 // on the medium chunk list. The next chunk will be small and progress
3202 // from there. This size calculated by -version.
3203 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
3204 (CompressedClassSpaceSize/BytesPerWord)*2);
3205 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
3206 // Arbitrarily set the initial virtual space to a multiple
3207 // of the boot class loader size.
3208 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
3209 word_size = align_size_up(word_size, Metaspace::reserve_alignment_words());
3211 // Initialize the list of virtual spaces.
3212 _space_list = new VirtualSpaceList(word_size);
3213 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
3215 if (!_space_list->initialization_succeeded()) {
3216 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
3217 }
3218 }
3220 MetaspaceGC::initialize();
3221 }
3223 Metachunk* Metaspace::get_initialization_chunk(MetadataType mdtype,
3224 size_t chunk_word_size,
3225 size_t chunk_bunch) {
3226 // Get a chunk from the chunk freelist
3227 Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
3228 if (chunk != NULL) {
3229 return chunk;
3230 }
3232 return get_space_list(mdtype)->get_new_chunk(chunk_word_size, chunk_word_size, chunk_bunch);
3233 }
3235 void Metaspace::initialize(Mutex* lock, MetaspaceType type) {
3237 assert(space_list() != NULL,
3238 "Metadata VirtualSpaceList has not been initialized");
3239 assert(chunk_manager_metadata() != NULL,
3240 "Metadata ChunkManager has not been initialized");
3242 _vsm = new SpaceManager(NonClassType, lock);
3243 if (_vsm == NULL) {
3244 return;
3245 }
3246 size_t word_size;
3247 size_t class_word_size;
3248 vsm()->get_initial_chunk_sizes(type, &word_size, &class_word_size);
3250 if (using_class_space()) {
3251 assert(class_space_list() != NULL,
3252 "Class VirtualSpaceList has not been initialized");
3253 assert(chunk_manager_class() != NULL,
3254 "Class ChunkManager has not been initialized");
3256 // Allocate SpaceManager for classes.
3257 _class_vsm = new SpaceManager(ClassType, lock);
3258 if (_class_vsm == NULL) {
3259 return;
3260 }
3261 }
3263 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3265 // Allocate chunk for metadata objects
3266 Metachunk* new_chunk = get_initialization_chunk(NonClassType,
3267 word_size,
3268 vsm()->medium_chunk_bunch());
3269 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
3270 if (new_chunk != NULL) {
3271 // Add to this manager's list of chunks in use and current_chunk().
3272 vsm()->add_chunk(new_chunk, true);
3273 }
3275 // Allocate chunk for class metadata objects
3276 if (using_class_space()) {
3277 Metachunk* class_chunk = get_initialization_chunk(ClassType,
3278 class_word_size,
3279 class_vsm()->medium_chunk_bunch());
3280 if (class_chunk != NULL) {
3281 class_vsm()->add_chunk(class_chunk, true);
3282 }
3283 }
3285 _alloc_record_head = NULL;
3286 _alloc_record_tail = NULL;
3287 }
3289 size_t Metaspace::align_word_size_up(size_t word_size) {
3290 size_t byte_size = word_size * wordSize;
3291 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
3292 }
3294 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
3295 // DumpSharedSpaces doesn't use class metadata area (yet)
3296 // Also, don't use class_vsm() unless UseCompressedClassPointers is true.
3297 if (is_class_space_allocation(mdtype)) {
3298 return class_vsm()->allocate(word_size);
3299 } else {
3300 return vsm()->allocate(word_size);
3301 }
3302 }
3304 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
3305 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
3306 assert(delta_bytes > 0, "Must be");
3308 size_t after_inc = MetaspaceGC::inc_capacity_until_GC(delta_bytes);
3309 size_t before_inc = after_inc - delta_bytes;
3311 if (PrintGCDetails && Verbose) {
3312 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
3313 " to " SIZE_FORMAT, before_inc, after_inc);
3314 }
3316 return allocate(word_size, mdtype);
3317 }
3319 // Space allocated in the Metaspace. This may
3320 // be across several metadata virtual spaces.
3321 char* Metaspace::bottom() const {
3322 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
3323 return (char*)vsm()->current_chunk()->bottom();
3324 }
3326 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
3327 if (mdtype == ClassType) {
3328 return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0;
3329 } else {
3330 return vsm()->sum_used_in_chunks_in_use(); // includes overhead!
3331 }
3332 }
3334 size_t Metaspace::free_words_slow(MetadataType mdtype) const {
3335 if (mdtype == ClassType) {
3336 return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0;
3337 } else {
3338 return vsm()->sum_free_in_chunks_in_use();
3339 }
3340 }
3342 // Space capacity in the Metaspace. It includes
3343 // space in the list of chunks from which allocations
3344 // have been made. Don't include space in the global freelist and
3345 // in the space available in the dictionary which
3346 // is already counted in some chunk.
3347 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
3348 if (mdtype == ClassType) {
3349 return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0;
3350 } else {
3351 return vsm()->sum_capacity_in_chunks_in_use();
3352 }
3353 }
3355 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
3356 return used_words_slow(mdtype) * BytesPerWord;
3357 }
3359 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
3360 return capacity_words_slow(mdtype) * BytesPerWord;
3361 }
3363 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
3364 if (SafepointSynchronize::is_at_safepoint()) {
3365 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
3366 // Don't take Heap_lock
3367 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
3368 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
3369 // Dark matter. Too small for dictionary.
3370 #ifdef ASSERT
3371 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
3372 #endif
3373 return;
3374 }
3375 if (is_class && using_class_space()) {
3376 class_vsm()->deallocate(ptr, word_size);
3377 } else {
3378 vsm()->deallocate(ptr, word_size);
3379 }
3380 } else {
3381 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
3383 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
3384 // Dark matter. Too small for dictionary.
3385 #ifdef ASSERT
3386 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
3387 #endif
3388 return;
3389 }
3390 if (is_class && using_class_space()) {
3391 class_vsm()->deallocate(ptr, word_size);
3392 } else {
3393 vsm()->deallocate(ptr, word_size);
3394 }
3395 }
3396 }
3399 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
3400 bool read_only, MetaspaceObj::Type type, TRAPS) {
3401 if (HAS_PENDING_EXCEPTION) {
3402 assert(false, "Should not allocate with exception pending");
3403 return NULL; // caller does a CHECK_NULL too
3404 }
3406 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
3407 "ClassLoaderData::the_null_class_loader_data() should have been used.");
3409 // Allocate in metaspaces without taking out a lock, because it deadlocks
3410 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
3411 // to revisit this for application class data sharing.
3412 if (DumpSharedSpaces) {
3413 assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity");
3414 Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace();
3415 MetaWord* result = space->allocate(word_size, NonClassType);
3416 if (result == NULL) {
3417 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
3418 } else {
3419 space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
3420 }
3421 return Metablock::initialize(result, word_size);
3422 }
3424 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
3426 // Try to allocate metadata.
3427 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
3429 if (result == NULL) {
3430 // Allocation failed.
3431 if (is_init_completed()) {
3432 // Only start a GC if the bootstrapping has completed.
3434 // Try to clean out some memory and retry.
3435 result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
3436 loader_data, word_size, mdtype);
3437 }
3438 }
3440 if (result == NULL) {
3441 report_metadata_oome(loader_data, word_size, mdtype, THREAD);
3442 // Will not reach here.
3443 return NULL;
3444 }
3446 return Metablock::initialize(result, word_size);
3447 }
3449 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetadataType mdtype, TRAPS) {
3450 // If result is still null, we are out of memory.
3451 if (Verbose && TraceMetadataChunkAllocation) {
3452 gclog_or_tty->print_cr("Metaspace allocation failed for size "
3453 SIZE_FORMAT, word_size);
3454 if (loader_data->metaspace_or_null() != NULL) {
3455 loader_data->dump(gclog_or_tty);
3456 }
3457 MetaspaceAux::dump(gclog_or_tty);
3458 }
3460 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
3461 const char* space_string = is_class_space_allocation(mdtype) ? "Compressed class space" :
3462 "Metadata space";
3463 report_java_out_of_memory(space_string);
3465 if (JvmtiExport::should_post_resource_exhausted()) {
3466 JvmtiExport::post_resource_exhausted(
3467 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
3468 space_string);
3469 }
3471 if (!is_init_completed()) {
3472 vm_exit_during_initialization("OutOfMemoryError", space_string);
3473 }
3475 if (is_class_space_allocation(mdtype)) {
3476 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
3477 } else {
3478 THROW_OOP(Universe::out_of_memory_error_metaspace());
3479 }
3480 }
3482 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
3483 assert(DumpSharedSpaces, "sanity");
3485 AllocRecord *rec = new AllocRecord((address)ptr, type, (int)word_size * HeapWordSize);
3486 if (_alloc_record_head == NULL) {
3487 _alloc_record_head = _alloc_record_tail = rec;
3488 } else {
3489 _alloc_record_tail->_next = rec;
3490 _alloc_record_tail = rec;
3491 }
3492 }
3494 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
3495 assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
3497 address last_addr = (address)bottom();
3499 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
3500 address ptr = rec->_ptr;
3501 if (last_addr < ptr) {
3502 closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr);
3503 }
3504 closure->doit(ptr, rec->_type, rec->_byte_size);
3505 last_addr = ptr + rec->_byte_size;
3506 }
3508 address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType);
3509 if (last_addr < top) {
3510 closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr);
3511 }
3512 }
3514 void Metaspace::purge(MetadataType mdtype) {
3515 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
3516 }
3518 void Metaspace::purge() {
3519 MutexLockerEx cl(SpaceManager::expand_lock(),
3520 Mutex::_no_safepoint_check_flag);
3521 purge(NonClassType);
3522 if (using_class_space()) {
3523 purge(ClassType);
3524 }
3525 }
3527 void Metaspace::print_on(outputStream* out) const {
3528 // Print both class virtual space counts and metaspace.
3529 if (Verbose) {
3530 vsm()->print_on(out);
3531 if (using_class_space()) {
3532 class_vsm()->print_on(out);
3533 }
3534 }
3535 }
3537 bool Metaspace::contains(const void * ptr) {
3538 if (MetaspaceShared::is_in_shared_space(ptr)) {
3539 return true;
3540 }
3541 // This is checked while unlocked. As long as the virtualspaces are added
3542 // at the end, the pointer will be in one of them. The virtual spaces
3543 // aren't deleted presently. When they are, some sort of locking might
3544 // be needed. Note, locking this can cause inversion problems with the
3545 // caller in MetaspaceObj::is_metadata() function.
3546 return space_list()->contains(ptr) ||
3547 (using_class_space() && class_space_list()->contains(ptr));
3548 }
3550 void Metaspace::verify() {
3551 vsm()->verify();
3552 if (using_class_space()) {
3553 class_vsm()->verify();
3554 }
3555 }
3557 void Metaspace::dump(outputStream* const out) const {
3558 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
3559 vsm()->dump(out);
3560 if (using_class_space()) {
3561 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
3562 class_vsm()->dump(out);
3563 }
3564 }
3566 /////////////// Unit tests ///////////////
3568 #ifndef PRODUCT
3570 class TestMetaspaceAuxTest : AllStatic {
3571 public:
3572 static void test_reserved() {
3573 size_t reserved = MetaspaceAux::reserved_bytes();
3575 assert(reserved > 0, "assert");
3577 size_t committed = MetaspaceAux::committed_bytes();
3578 assert(committed <= reserved, "assert");
3580 size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType);
3581 assert(reserved_metadata > 0, "assert");
3582 assert(reserved_metadata <= reserved, "assert");
3584 if (UseCompressedClassPointers) {
3585 size_t reserved_class = MetaspaceAux::reserved_bytes(Metaspace::ClassType);
3586 assert(reserved_class > 0, "assert");
3587 assert(reserved_class < reserved, "assert");
3588 }
3589 }
3591 static void test_committed() {
3592 size_t committed = MetaspaceAux::committed_bytes();
3594 assert(committed > 0, "assert");
3596 size_t reserved = MetaspaceAux::reserved_bytes();
3597 assert(committed <= reserved, "assert");
3599 size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType);
3600 assert(committed_metadata > 0, "assert");
3601 assert(committed_metadata <= committed, "assert");
3603 if (UseCompressedClassPointers) {
3604 size_t committed_class = MetaspaceAux::committed_bytes(Metaspace::ClassType);
3605 assert(committed_class > 0, "assert");
3606 assert(committed_class < committed, "assert");
3607 }
3608 }
3610 static void test_virtual_space_list_large_chunk() {
3611 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
3612 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3613 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
3614 // vm_allocation_granularity aligned on Windows.
3615 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
3616 large_size += (os::vm_page_size()/BytesPerWord);
3617 vs_list->get_new_chunk(large_size, large_size, 0);
3618 }
3620 static void test() {
3621 test_reserved();
3622 test_committed();
3623 test_virtual_space_list_large_chunk();
3624 }
3625 };
3627 void TestMetaspaceAux_test() {
3628 TestMetaspaceAuxTest::test();
3629 }
3631 #endif