1 /*
2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "gc_interface/collectedHeap.hpp"
26 #include "memory/allocation.hpp"
27 #include "memory/binaryTreeDictionary.hpp"
28 #include "memory/freeList.hpp"
29 #include "memory/collectorPolicy.hpp"
30 #include "memory/filemap.hpp"
31 #include "memory/freeList.hpp"
32 #include "memory/gcLocker.hpp"
33 #include "memory/metachunk.hpp"
34 #include "memory/metaspace.hpp"
35 #include "memory/metaspaceGCThresholdUpdater.hpp"
36 #include "memory/metaspaceShared.hpp"
37 #include "memory/metaspaceTracer.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "runtime/atomic.inline.hpp"
41 #include "runtime/globals.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/java.hpp"
44 #include "runtime/mutex.hpp"
45 #include "runtime/orderAccess.inline.hpp"
46 #include "services/memTracker.hpp"
47 #include "services/memoryService.hpp"
48 #include "utilities/copy.hpp"
49 #include "utilities/debug.hpp"
50
51 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
52
53 typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary;
54 typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary;
55
56 // Set this constant to enable slow integrity checking of the free chunk lists
57 const bool metaspace_slow_verify = false;
58
59 size_t const allocation_from_dictionary_limit = 4 * K;
60
61 MetaWord* last_allocated = 0;
62
63 size_t Metaspace::_compressed_class_space_size;
64 const MetaspaceTracer* Metaspace::_tracer = NULL;
65
66 // Used in declarations in SpaceManager and ChunkManager
67 enum ChunkIndex {
68 ZeroIndex = 0,
69 SpecializedIndex = ZeroIndex,
70 SmallIndex = SpecializedIndex + 1,
71 MediumIndex = SmallIndex + 1,
72 HumongousIndex = MediumIndex + 1,
73 NumberOfFreeLists = 3,
74 NumberOfInUseLists = 4
75 };
76
77 enum ChunkSizes { // in words.
78 ClassSpecializedChunk = 128,
79 SpecializedChunk = 128,
80 ClassSmallChunk = 256,
81 SmallChunk = 512,
82 ClassMediumChunk = 4 * K,
83 MediumChunk = 8 * K
84 };
85
86 static ChunkIndex next_chunk_index(ChunkIndex i) {
87 assert(i < NumberOfInUseLists, "Out of bound");
88 return (ChunkIndex) (i+1);
89 }
90
91 volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
92 uint MetaspaceGC::_shrink_factor = 0;
93 bool MetaspaceGC::_should_concurrent_collect = false;
94
95 typedef class FreeList<Metachunk> ChunkList;
96
97 // Manages the global free lists of chunks.
98 class ChunkManager : public CHeapObj<mtInternal> {
99 friend class TestVirtualSpaceNodeTest;
100
101 // Free list of chunks of different sizes.
102 // SpecializedChunk
103 // SmallChunk
104 // MediumChunk
105 // HumongousChunk
106 ChunkList _free_chunks[NumberOfFreeLists];
107
108 // HumongousChunk
109 ChunkTreeDictionary _humongous_dictionary;
110
111 // ChunkManager in all lists of this type
112 size_t _free_chunks_total;
113 size_t _free_chunks_count;
114
115 void dec_free_chunks_total(size_t v) {
116 assert(_free_chunks_count > 0 &&
117 _free_chunks_total > 0,
118 "About to go negative");
119 Atomic::add_ptr(-1, &_free_chunks_count);
120 jlong minus_v = (jlong) - (jlong) v;
121 Atomic::add_ptr(minus_v, &_free_chunks_total);
122 }
123
124 // Debug support
125
126 size_t sum_free_chunks();
127 size_t sum_free_chunks_count();
128
129 void locked_verify_free_chunks_total();
130 void slow_locked_verify_free_chunks_total() {
131 if (metaspace_slow_verify) {
132 locked_verify_free_chunks_total();
133 }
134 }
135 void locked_verify_free_chunks_count();
136 void slow_locked_verify_free_chunks_count() {
137 if (metaspace_slow_verify) {
138 locked_verify_free_chunks_count();
139 }
140 }
141 void verify_free_chunks_count();
142
143 public:
144
145 ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size)
146 : _free_chunks_total(0), _free_chunks_count(0) {
147 _free_chunks[SpecializedIndex].set_size(specialized_size);
148 _free_chunks[SmallIndex].set_size(small_size);
149 _free_chunks[MediumIndex].set_size(medium_size);
150 }
151
152 // add or delete (return) a chunk to the global freelist.
153 Metachunk* chunk_freelist_allocate(size_t word_size);
154
155 // Map a size to a list index assuming that there are lists
156 // for special, small, medium, and humongous chunks.
157 static ChunkIndex list_index(size_t size);
158
159 // Remove the chunk from its freelist. It is
160 // expected to be on one of the _free_chunks[] lists.
161 void remove_chunk(Metachunk* chunk);
162
163 // Add the simple linked list of chunks to the freelist of chunks
164 // of type index.
165 void return_chunks(ChunkIndex index, Metachunk* chunks);
166
167 // Total of the space in the free chunks list
168 size_t free_chunks_total_words();
169 size_t free_chunks_total_bytes();
170
171 // Number of chunks in the free chunks list
172 size_t free_chunks_count();
173
174 void inc_free_chunks_total(size_t v, size_t count = 1) {
175 Atomic::add_ptr(count, &_free_chunks_count);
176 Atomic::add_ptr(v, &_free_chunks_total);
177 }
178 ChunkTreeDictionary* humongous_dictionary() {
179 return &_humongous_dictionary;
180 }
181
182 ChunkList* free_chunks(ChunkIndex index);
183
184 // Returns the list for the given chunk word size.
185 ChunkList* find_free_chunks_list(size_t word_size);
186
187 // Remove from a list by size. Selects list based on size of chunk.
188 Metachunk* free_chunks_get(size_t chunk_word_size);
189
190 #define index_bounds_check(index) \
191 assert(index == SpecializedIndex || \
192 index == SmallIndex || \
193 index == MediumIndex || \
194 index == HumongousIndex, err_msg("Bad index: %d", (int) index))
195
196 size_t num_free_chunks(ChunkIndex index) const {
197 index_bounds_check(index);
198
199 if (index == HumongousIndex) {
200 return _humongous_dictionary.total_free_blocks();
201 }
202
203 ssize_t count = _free_chunks[index].count();
204 return count == -1 ? 0 : (size_t) count;
205 }
206
207 size_t size_free_chunks_in_bytes(ChunkIndex index) const {
208 index_bounds_check(index);
209
210 size_t word_size = 0;
211 if (index == HumongousIndex) {
212 word_size = _humongous_dictionary.total_size();
213 } else {
214 const size_t size_per_chunk_in_words = _free_chunks[index].size();
215 word_size = size_per_chunk_in_words * num_free_chunks(index);
216 }
217
218 return word_size * BytesPerWord;
219 }
220
221 MetaspaceChunkFreeListSummary chunk_free_list_summary() const {
222 return MetaspaceChunkFreeListSummary(num_free_chunks(SpecializedIndex),
223 num_free_chunks(SmallIndex),
224 num_free_chunks(MediumIndex),
225 num_free_chunks(HumongousIndex),
226 size_free_chunks_in_bytes(SpecializedIndex),
227 size_free_chunks_in_bytes(SmallIndex),
228 size_free_chunks_in_bytes(MediumIndex),
229 size_free_chunks_in_bytes(HumongousIndex));
230 }
231
232 // Debug support
233 void verify();
234 void slow_verify() {
235 if (metaspace_slow_verify) {
236 verify();
237 }
238 }
239 void locked_verify();
240 void slow_locked_verify() {
241 if (metaspace_slow_verify) {
242 locked_verify();
243 }
244 }
245 void verify_free_chunks_total();
246
247 void locked_print_free_chunks(outputStream* st);
248 void locked_print_sum_free_chunks(outputStream* st);
249
250 void print_on(outputStream* st) const;
251 };
252
253 // Used to manage the free list of Metablocks (a block corresponds
254 // to the allocation of a quantum of metadata).
255 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
256 BlockTreeDictionary* _dictionary;
257
258 // Only allocate and split from freelist if the size of the allocation
259 // is at least 1/4th the size of the available block.
260 const static int WasteMultiplier = 4;
261
262 // Accessors
263 BlockTreeDictionary* dictionary() const { return _dictionary; }
264
265 public:
266 BlockFreelist();
267 ~BlockFreelist();
268
269 // Get and return a block to the free list
270 MetaWord* get_block(size_t word_size);
271 void return_block(MetaWord* p, size_t word_size);
272
273 size_t total_size() {
274 if (dictionary() == NULL) {
275 return 0;
276 } else {
277 return dictionary()->total_size();
278 }
279 }
280
281 void print_on(outputStream* st) const;
282 };
283
284 // A VirtualSpaceList node.
285 class VirtualSpaceNode : public CHeapObj<mtClass> {
286 friend class VirtualSpaceList;
287
288 // Link to next VirtualSpaceNode
289 VirtualSpaceNode* _next;
290
291 // total in the VirtualSpace
292 MemRegion _reserved;
293 ReservedSpace _rs;
294 VirtualSpace _virtual_space;
295 MetaWord* _top;
296 // count of chunks contained in this VirtualSpace
297 uintx _container_count;
298
299 // Convenience functions to access the _virtual_space
300 char* low() const { return virtual_space()->low(); }
301 char* high() const { return virtual_space()->high(); }
302
303 // The first Metachunk will be allocated at the bottom of the
304 // VirtualSpace
305 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
306
307 // Committed but unused space in the virtual space
308 size_t free_words_in_vs() const;
309 public:
310
311 VirtualSpaceNode(size_t byte_size);
312 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
313 ~VirtualSpaceNode();
314
315 // Convenience functions for logical bottom and end
316 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
317 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
318
319 bool contains(const void* ptr) { return ptr >= low() && ptr < high(); }
320
321 size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; }
322 size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; }
323
324 bool is_pre_committed() const { return _virtual_space.special(); }
325
326 // address of next available space in _virtual_space;
327 // Accessors
328 VirtualSpaceNode* next() { return _next; }
329 void set_next(VirtualSpaceNode* v) { _next = v; }
330
331 void set_reserved(MemRegion const v) { _reserved = v; }
332 void set_top(MetaWord* v) { _top = v; }
333
334 // Accessors
335 MemRegion* reserved() { return &_reserved; }
336 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
337
338 // Returns true if "word_size" is available in the VirtualSpace
339 bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); }
340
341 MetaWord* top() const { return _top; }
342 void inc_top(size_t word_size) { _top += word_size; }
343
344 uintx container_count() { return _container_count; }
345 void inc_container_count();
346 void dec_container_count();
347 #ifdef ASSERT
348 uint container_count_slow();
349 void verify_container_count();
350 #endif
351
352 // used and capacity in this single entry in the list
353 size_t used_words_in_vs() const;
354 size_t capacity_words_in_vs() const;
355
356 bool initialize();
357
358 // get space from the virtual space
359 Metachunk* take_from_committed(size_t chunk_word_size);
360
361 // Allocate a chunk from the virtual space and return it.
362 Metachunk* get_chunk_vs(size_t chunk_word_size);
363
364 // Expands/shrinks the committed space in a virtual space. Delegates
365 // to Virtualspace
366 bool expand_by(size_t min_words, size_t preferred_words);
367
368 // In preparation for deleting this node, remove all the chunks
369 // in the node from any freelist.
370 void purge(ChunkManager* chunk_manager);
371
372 // If an allocation doesn't fit in the current node a new node is created.
373 // Allocate chunks out of the remaining committed space in this node
374 // to avoid wasting that memory.
375 // This always adds up because all the chunk sizes are multiples of
376 // the smallest chunk size.
377 void retire(ChunkManager* chunk_manager);
378
379 #ifdef ASSERT
380 // Debug support
381 void mangle();
382 #endif
383
384 void print_on(outputStream* st) const;
385 };
386
387 #define assert_is_ptr_aligned(ptr, alignment) \
388 assert(is_ptr_aligned(ptr, alignment), \
389 err_msg(PTR_FORMAT " is not aligned to " \
390 SIZE_FORMAT, ptr, alignment))
391
392 #define assert_is_size_aligned(size, alignment) \
393 assert(is_size_aligned(size, alignment), \
394 err_msg(SIZE_FORMAT " is not aligned to " \
395 SIZE_FORMAT, size, alignment))
396
397
398 // Decide if large pages should be committed when the memory is reserved.
399 static bool should_commit_large_pages_when_reserving(size_t bytes) {
400 if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) {
401 size_t words = bytes / BytesPerWord;
402 bool is_class = false; // We never reserve large pages for the class space.
403 if (MetaspaceGC::can_expand(words, is_class) &&
404 MetaspaceGC::allowed_expansion() >= words) {
405 return true;
406 }
407 }
408
409 return false;
410 }
411
412 // byte_size is the size of the associated virtualspace.
413 VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
414 assert_is_size_aligned(bytes, Metaspace::reserve_alignment());
415
416 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
417 // configurable address, generally at the top of the Java heap so other
418 // memory addresses don't conflict.
419 if (DumpSharedSpaces) {
420 bool large_pages = false; // No large pages when dumping the CDS archive.
421 char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment());
422
423 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base, 0);
424 if (_rs.is_reserved()) {
425 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
426 } else {
427 // Get a mmap region anywhere if the SharedBaseAddress fails.
428 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
429 }
430 MetaspaceShared::set_shared_rs(&_rs);
431 } else {
432 bool large_pages = should_commit_large_pages_when_reserving(bytes);
433
434 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
435 }
436
437 if (_rs.is_reserved()) {
438 assert(_rs.base() != NULL, "Catch if we get a NULL address");
439 assert(_rs.size() != 0, "Catch if we get a 0 size");
440 assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment());
441 assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment());
442
443 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
444 }
445 }
446
447 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
448 Metachunk* chunk = first_chunk();
449 Metachunk* invalid_chunk = (Metachunk*) top();
450 while (chunk < invalid_chunk ) {
451 assert(chunk->is_tagged_free(), "Should be tagged free");
452 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
453 chunk_manager->remove_chunk(chunk);
454 assert(chunk->next() == NULL &&
455 chunk->prev() == NULL,
456 "Was not removed from its list");
457 chunk = (Metachunk*) next;
458 }
459 }
460
461 #ifdef ASSERT
462 uint VirtualSpaceNode::container_count_slow() {
463 uint count = 0;
464 Metachunk* chunk = first_chunk();
465 Metachunk* invalid_chunk = (Metachunk*) top();
466 while (chunk < invalid_chunk ) {
467 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
468 // Don't count the chunks on the free lists. Those are
469 // still part of the VirtualSpaceNode but not currently
470 // counted.
471 if (!chunk->is_tagged_free()) {
472 count++;
473 }
474 chunk = (Metachunk*) next;
475 }
476 return count;
477 }
478 #endif
479
480 // List of VirtualSpaces for metadata allocation.
481 class VirtualSpaceList : public CHeapObj<mtClass> {
482 friend class VirtualSpaceNode;
483
484 enum VirtualSpaceSizes {
485 VirtualSpaceSize = 256 * K
486 };
487
488 // Head of the list
489 VirtualSpaceNode* _virtual_space_list;
490 // virtual space currently being used for allocations
491 VirtualSpaceNode* _current_virtual_space;
492
493 // Is this VirtualSpaceList used for the compressed class space
494 bool _is_class;
495
496 // Sum of reserved and committed memory in the virtual spaces
497 size_t _reserved_words;
498 size_t _committed_words;
499
500 // Number of virtual spaces
501 size_t _virtual_space_count;
502
503 ~VirtualSpaceList();
504
505 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
506
507 void set_virtual_space_list(VirtualSpaceNode* v) {
508 _virtual_space_list = v;
509 }
510 void set_current_virtual_space(VirtualSpaceNode* v) {
511 _current_virtual_space = v;
512 }
513
514 void link_vs(VirtualSpaceNode* new_entry);
515
516 // Get another virtual space and add it to the list. This
517 // is typically prompted by a failed attempt to allocate a chunk
518 // and is typically followed by the allocation of a chunk.
519 bool create_new_virtual_space(size_t vs_word_size);
520
521 // Chunk up the unused committed space in the current
522 // virtual space and add the chunks to the free list.
523 void retire_current_virtual_space();
524
525 public:
526 VirtualSpaceList(size_t word_size);
527 VirtualSpaceList(ReservedSpace rs);
528
529 size_t free_bytes();
530
531 Metachunk* get_new_chunk(size_t word_size,
532 size_t grow_chunks_by_words,
533 size_t medium_chunk_bunch);
534
535 bool expand_node_by(VirtualSpaceNode* node,
536 size_t min_words,
537 size_t preferred_words);
538
539 bool expand_by(size_t min_words,
540 size_t preferred_words);
541
542 VirtualSpaceNode* current_virtual_space() {
543 return _current_virtual_space;
544 }
545
546 bool is_class() const { return _is_class; }
547
548 bool initialization_succeeded() { return _virtual_space_list != NULL; }
549
550 size_t reserved_words() { return _reserved_words; }
551 size_t reserved_bytes() { return reserved_words() * BytesPerWord; }
552 size_t committed_words() { return _committed_words; }
553 size_t committed_bytes() { return committed_words() * BytesPerWord; }
554
555 void inc_reserved_words(size_t v);
556 void dec_reserved_words(size_t v);
557 void inc_committed_words(size_t v);
558 void dec_committed_words(size_t v);
559 void inc_virtual_space_count();
560 void dec_virtual_space_count();
561
562 bool contains(const void* ptr);
563
564 // Unlink empty VirtualSpaceNodes and free it.
565 void purge(ChunkManager* chunk_manager);
566
567 void print_on(outputStream* st) const;
568
569 class VirtualSpaceListIterator : public StackObj {
570 VirtualSpaceNode* _virtual_spaces;
571 public:
572 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
573 _virtual_spaces(virtual_spaces) {}
574
575 bool repeat() {
576 return _virtual_spaces != NULL;
577 }
578
579 VirtualSpaceNode* get_next() {
580 VirtualSpaceNode* result = _virtual_spaces;
581 if (_virtual_spaces != NULL) {
582 _virtual_spaces = _virtual_spaces->next();
583 }
584 return result;
585 }
586 };
587 };
588
589 class Metadebug : AllStatic {
590 // Debugging support for Metaspaces
591 static int _allocation_fail_alot_count;
592
593 public:
594
595 static void init_allocation_fail_alot_count();
596 #ifdef ASSERT
597 static bool test_metadata_failure();
598 #endif
599 };
600
601 int Metadebug::_allocation_fail_alot_count = 0;
602
603 // SpaceManager - used by Metaspace to handle allocations
604 class SpaceManager : public CHeapObj<mtClass> {
605 friend class Metaspace;
606 friend class Metadebug;
607
608 private:
609
610 // protects allocations
611 Mutex* const _lock;
612
613 // Type of metadata allocated.
614 Metaspace::MetadataType _mdtype;
615
616 // List of chunks in use by this SpaceManager. Allocations
617 // are done from the current chunk. The list is used for deallocating
618 // chunks when the SpaceManager is freed.
619 Metachunk* _chunks_in_use[NumberOfInUseLists];
620 Metachunk* _current_chunk;
621
622 // Number of small chunks to allocate to a manager
623 // If class space manager, small chunks are unlimited
624 static uint const _small_chunk_limit;
625
626 // Sum of all space in allocated chunks
627 size_t _allocated_blocks_words;
628
629 // Sum of all allocated chunks
630 size_t _allocated_chunks_words;
631 size_t _allocated_chunks_count;
632
633 // Free lists of blocks are per SpaceManager since they
634 // are assumed to be in chunks in use by the SpaceManager
635 // and all chunks in use by a SpaceManager are freed when
636 // the class loader using the SpaceManager is collected.
637 BlockFreelist _block_freelists;
638
639 // protects virtualspace and chunk expansions
640 static const char* _expand_lock_name;
641 static const int _expand_lock_rank;
642 static Mutex* const _expand_lock;
643
644 private:
645 // Accessors
646 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
647 void set_chunks_in_use(ChunkIndex index, Metachunk* v) {
648 _chunks_in_use[index] = v;
649 }
650
651 BlockFreelist* block_freelists() const {
652 return (BlockFreelist*) &_block_freelists;
653 }
654
655 Metaspace::MetadataType mdtype() { return _mdtype; }
656
657 VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); }
658 ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); }
659
660 Metachunk* current_chunk() const { return _current_chunk; }
661 void set_current_chunk(Metachunk* v) {
662 _current_chunk = v;
663 }
664
665 Metachunk* find_current_chunk(size_t word_size);
666
667 // Add chunk to the list of chunks in use
668 void add_chunk(Metachunk* v, bool make_current);
669 void retire_current_chunk();
670
671 Mutex* lock() const { return _lock; }
672
673 const char* chunk_size_name(ChunkIndex index) const;
674
675 protected:
676 void initialize();
677
678 public:
679 SpaceManager(Metaspace::MetadataType mdtype,
680 Mutex* lock);
681 ~SpaceManager();
682
683 enum ChunkMultiples {
684 MediumChunkMultiple = 4
685 };
686
687 bool is_class() { return _mdtype == Metaspace::ClassType; }
688
689 // Accessors
690 size_t specialized_chunk_size() { return (size_t) is_class() ? ClassSpecializedChunk : SpecializedChunk; }
691 size_t small_chunk_size() { return (size_t) is_class() ? ClassSmallChunk : SmallChunk; }
692 size_t medium_chunk_size() { return (size_t) is_class() ? ClassMediumChunk : MediumChunk; }
693 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
694
695 size_t smallest_chunk_size() { return specialized_chunk_size(); }
696
697 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
698 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
699 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
700 size_t allocated_chunks_bytes() const { return _allocated_chunks_words * BytesPerWord; }
701 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
702
703 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
704
705 static Mutex* expand_lock() { return _expand_lock; }
706
707 // Increment the per Metaspace and global running sums for Metachunks
708 // by the given size. This is used when a Metachunk to added to
709 // the in-use list.
710 void inc_size_metrics(size_t words);
711 // Increment the per Metaspace and global running sums Metablocks by the given
712 // size. This is used when a Metablock is allocated.
713 void inc_used_metrics(size_t words);
714 // Delete the portion of the running sums for this SpaceManager. That is,
715 // the globals running sums for the Metachunks and Metablocks are
716 // decremented for all the Metachunks in-use by this SpaceManager.
717 void dec_total_from_size_metrics();
718
719 // Set the sizes for the initial chunks.
720 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
721 size_t* chunk_word_size,
722 size_t* class_chunk_word_size);
723
724 size_t sum_capacity_in_chunks_in_use() const;
725 size_t sum_used_in_chunks_in_use() const;
726 size_t sum_free_in_chunks_in_use() const;
727 size_t sum_waste_in_chunks_in_use() const;
728 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
729
730 size_t sum_count_in_chunks_in_use();
731 size_t sum_count_in_chunks_in_use(ChunkIndex i);
732
733 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
734
735 // Block allocation and deallocation.
736 // Allocates a block from the current chunk
737 MetaWord* allocate(size_t word_size);
738
739 // Helper for allocations
740 MetaWord* allocate_work(size_t word_size);
741
742 // Returns a block to the per manager freelist
743 void deallocate(MetaWord* p, size_t word_size);
744
745 // Based on the allocation size and a minimum chunk size,
746 // returned chunk size (for expanding space for chunk allocation).
747 size_t calc_chunk_size(size_t allocation_word_size);
748
749 // Called when an allocation from the current chunk fails.
750 // Gets a new chunk (may require getting a new virtual space),
751 // and allocates from that chunk.
752 MetaWord* grow_and_allocate(size_t word_size);
753
754 // Notify memory usage to MemoryService.
755 void track_metaspace_memory_usage();
756
757 // debugging support.
758
759 void dump(outputStream* const out) const;
760 void print_on(outputStream* st) const;
761 void locked_print_chunks_in_use_on(outputStream* st) const;
762
763 void verify();
764 void verify_chunk_size(Metachunk* chunk);
765 NOT_PRODUCT(void mangle_freed_chunks();)
766 #ifdef ASSERT
767 void verify_allocated_blocks_words();
768 #endif
769
770 size_t get_raw_word_size(size_t word_size) {
771 size_t byte_size = word_size * BytesPerWord;
772
773 size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock));
774 raw_bytes_size = align_size_up(raw_bytes_size, Metachunk::object_alignment());
775
776 size_t raw_word_size = raw_bytes_size / BytesPerWord;
777 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
778
779 return raw_word_size;
780 }
781 };
782
783 uint const SpaceManager::_small_chunk_limit = 4;
784
785 const char* SpaceManager::_expand_lock_name =
786 "SpaceManager chunk allocation lock";
787 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
788 Mutex* const SpaceManager::_expand_lock =
789 new Mutex(SpaceManager::_expand_lock_rank,
790 SpaceManager::_expand_lock_name,
791 Mutex::_allow_vm_block_flag);
792
793 void VirtualSpaceNode::inc_container_count() {
794 assert_lock_strong(SpaceManager::expand_lock());
795 _container_count++;
796 assert(_container_count == container_count_slow(),
797 err_msg("Inconsistency in container_count _container_count " SIZE_FORMAT
798 " container_count_slow() " SIZE_FORMAT,
799 _container_count, container_count_slow()));
800 }
801
802 void VirtualSpaceNode::dec_container_count() {
803 assert_lock_strong(SpaceManager::expand_lock());
804 _container_count--;
805 }
806
807 #ifdef ASSERT
808 void VirtualSpaceNode::verify_container_count() {
809 assert(_container_count == container_count_slow(),
810 err_msg("Inconsistency in container_count _container_count " SIZE_FORMAT
811 " container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
812 }
813 #endif
814
815 // BlockFreelist methods
816
817 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
818
819 BlockFreelist::~BlockFreelist() {
820 if (_dictionary != NULL) {
821 if (Verbose && TraceMetadataChunkAllocation) {
822 _dictionary->print_free_lists(gclog_or_tty);
823 }
824 delete _dictionary;
825 }
826 }
827
828 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
829 Metablock* free_chunk = ::new (p) Metablock(word_size);
830 if (dictionary() == NULL) {
831 _dictionary = new BlockTreeDictionary();
832 }
833 dictionary()->return_chunk(free_chunk);
834 }
835
836 MetaWord* BlockFreelist::get_block(size_t word_size) {
837 if (dictionary() == NULL) {
838 return NULL;
839 }
840
841 if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
842 // Dark matter. Too small for dictionary.
843 return NULL;
844 }
845
846 Metablock* free_block =
847 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast);
848 if (free_block == NULL) {
849 return NULL;
850 }
851
852 const size_t block_size = free_block->size();
853 if (block_size > WasteMultiplier * word_size) {
854 return_block((MetaWord*)free_block, block_size);
855 return NULL;
856 }
857
858 MetaWord* new_block = (MetaWord*)free_block;
859 assert(block_size >= word_size, "Incorrect size of block from freelist");
860 const size_t unused = block_size - word_size;
861 if (unused >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
862 return_block(new_block + word_size, unused);
863 }
864
865 return new_block;
866 }
867
868 void BlockFreelist::print_on(outputStream* st) const {
869 if (dictionary() == NULL) {
870 return;
871 }
872 dictionary()->print_free_lists(st);
873 }
874
875 // VirtualSpaceNode methods
876
877 VirtualSpaceNode::~VirtualSpaceNode() {
878 _rs.release();
879 #ifdef ASSERT
880 size_t word_size = sizeof(*this) / BytesPerWord;
881 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
882 #endif
883 }
884
885 size_t VirtualSpaceNode::used_words_in_vs() const {
886 return pointer_delta(top(), bottom(), sizeof(MetaWord));
887 }
888
889 // Space committed in the VirtualSpace
890 size_t VirtualSpaceNode::capacity_words_in_vs() const {
891 return pointer_delta(end(), bottom(), sizeof(MetaWord));
892 }
893
894 size_t VirtualSpaceNode::free_words_in_vs() const {
895 return pointer_delta(end(), top(), sizeof(MetaWord));
896 }
897
898 // Allocates the chunk from the virtual space only.
899 // This interface is also used internally for debugging. Not all
900 // chunks removed here are necessarily used for allocation.
901 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
902 // Bottom of the new chunk
903 MetaWord* chunk_limit = top();
904 assert(chunk_limit != NULL, "Not safe to call this method");
905
906 // The virtual spaces are always expanded by the
907 // commit granularity to enforce the following condition.
908 // Without this the is_available check will not work correctly.
909 assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(),
910 "The committed memory doesn't match the expanded memory.");
911
912 if (!is_available(chunk_word_size)) {
913 if (TraceMetadataChunkAllocation) {
914 gclog_or_tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
915 // Dump some information about the virtual space that is nearly full
916 print_on(gclog_or_tty);
917 }
918 return NULL;
919 }
920
921 // Take the space (bump top on the current virtual space).
922 inc_top(chunk_word_size);
923
924 // Initialize the chunk
925 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
926 return result;
927 }
928
929
930 // Expand the virtual space (commit more of the reserved space)
931 bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) {
932 size_t min_bytes = min_words * BytesPerWord;
933 size_t preferred_bytes = preferred_words * BytesPerWord;
934
935 size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size();
936
937 if (uncommitted < min_bytes) {
938 return false;
939 }
940
941 size_t commit = MIN2(preferred_bytes, uncommitted);
942 bool result = virtual_space()->expand_by(commit, false);
943
944 assert(result, "Failed to commit memory");
945
946 return result;
947 }
948
949 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
950 assert_lock_strong(SpaceManager::expand_lock());
951 Metachunk* result = take_from_committed(chunk_word_size);
952 if (result != NULL) {
953 inc_container_count();
954 }
955 return result;
956 }
957
958 bool VirtualSpaceNode::initialize() {
959
960 if (!_rs.is_reserved()) {
961 return false;
962 }
963
964 // These are necessary restriction to make sure that the virtual space always
965 // grows in steps of Metaspace::commit_alignment(). If both base and size are
966 // aligned only the middle alignment of the VirtualSpace is used.
967 assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment());
968 assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment());
969
970 // ReservedSpaces marked as special will have the entire memory
971 // pre-committed. Setting a committed size will make sure that
972 // committed_size and actual_committed_size agrees.
973 size_t pre_committed_size = _rs.special() ? _rs.size() : 0;
974
975 bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size,
976 Metaspace::commit_alignment());
977 if (result) {
978 assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(),
979 "Checking that the pre-committed memory was registered by the VirtualSpace");
980
981 set_top((MetaWord*)virtual_space()->low());
982 set_reserved(MemRegion((HeapWord*)_rs.base(),
983 (HeapWord*)(_rs.base() + _rs.size())));
984
985 assert(reserved()->start() == (HeapWord*) _rs.base(),
986 err_msg("Reserved start was not set properly " PTR_FORMAT
987 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
988 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
989 err_msg("Reserved size was not set properly " SIZE_FORMAT
990 " != " SIZE_FORMAT, reserved()->word_size(),
991 _rs.size() / BytesPerWord));
992 }
993
994 return result;
995 }
996
997 void VirtualSpaceNode::print_on(outputStream* st) const {
998 size_t used = used_words_in_vs();
999 size_t capacity = capacity_words_in_vs();
1000 VirtualSpace* vs = virtual_space();
1001 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
1002 "[" PTR_FORMAT ", " PTR_FORMAT ", "
1003 PTR_FORMAT ", " PTR_FORMAT ")",
1004 vs, capacity / K,
1005 capacity == 0 ? 0 : used * 100 / capacity,
1006 bottom(), top(), end(),
1007 vs->high_boundary());
1008 }
1009
1010 #ifdef ASSERT
1011 void VirtualSpaceNode::mangle() {
1012 size_t word_size = capacity_words_in_vs();
1013 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
1014 }
1015 #endif // ASSERT
1016
1017 // VirtualSpaceList methods
1018 // Space allocated from the VirtualSpace
1019
1020 VirtualSpaceList::~VirtualSpaceList() {
1021 VirtualSpaceListIterator iter(virtual_space_list());
1022 while (iter.repeat()) {
1023 VirtualSpaceNode* vsl = iter.get_next();
1024 delete vsl;
1025 }
1026 }
1027
1028 void VirtualSpaceList::inc_reserved_words(size_t v) {
1029 assert_lock_strong(SpaceManager::expand_lock());
1030 _reserved_words = _reserved_words + v;
1031 }
1032 void VirtualSpaceList::dec_reserved_words(size_t v) {
1033 assert_lock_strong(SpaceManager::expand_lock());
1034 _reserved_words = _reserved_words - v;
1035 }
1036
1037 #define assert_committed_below_limit() \
1038 assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize, \
1039 err_msg("Too much committed memory. Committed: " SIZE_FORMAT \
1040 " limit (MaxMetaspaceSize): " SIZE_FORMAT, \
1041 MetaspaceAux::committed_bytes(), MaxMetaspaceSize));
1042
1043 void VirtualSpaceList::inc_committed_words(size_t v) {
1044 assert_lock_strong(SpaceManager::expand_lock());
1045 _committed_words = _committed_words + v;
1046
1047 assert_committed_below_limit();
1048 }
1049 void VirtualSpaceList::dec_committed_words(size_t v) {
1050 assert_lock_strong(SpaceManager::expand_lock());
1051 _committed_words = _committed_words - v;
1052
1053 assert_committed_below_limit();
1054 }
1055
1056 void VirtualSpaceList::inc_virtual_space_count() {
1057 assert_lock_strong(SpaceManager::expand_lock());
1058 _virtual_space_count++;
1059 }
1060 void VirtualSpaceList::dec_virtual_space_count() {
1061 assert_lock_strong(SpaceManager::expand_lock());
1062 _virtual_space_count--;
1063 }
1064
1065 void ChunkManager::remove_chunk(Metachunk* chunk) {
1066 size_t word_size = chunk->word_size();
1067 ChunkIndex index = list_index(word_size);
1068 if (index != HumongousIndex) {
1069 free_chunks(index)->remove_chunk(chunk);
1070 } else {
1071 humongous_dictionary()->remove_chunk(chunk);
1072 }
1073
1074 // Chunk is being removed from the chunks free list.
1075 dec_free_chunks_total(chunk->word_size());
1076 }
1077
1078 // Walk the list of VirtualSpaceNodes and delete
1079 // nodes with a 0 container_count. Remove Metachunks in
1080 // the node from their respective freelists.
1081 void VirtualSpaceList::purge(ChunkManager* chunk_manager) {
1082 assert(SafepointSynchronize::is_at_safepoint(), "must be called at safepoint for contains to work");
1083 assert_lock_strong(SpaceManager::expand_lock());
1084 // Don't use a VirtualSpaceListIterator because this
1085 // list is being changed and a straightforward use of an iterator is not safe.
1086 VirtualSpaceNode* purged_vsl = NULL;
1087 VirtualSpaceNode* prev_vsl = virtual_space_list();
1088 VirtualSpaceNode* next_vsl = prev_vsl;
1089 while (next_vsl != NULL) {
1090 VirtualSpaceNode* vsl = next_vsl;
1091 next_vsl = vsl->next();
1092 // Don't free the current virtual space since it will likely
1093 // be needed soon.
1094 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
1095 // Unlink it from the list
1096 if (prev_vsl == vsl) {
1097 // This is the case of the current node being the first node.
1098 assert(vsl == virtual_space_list(), "Expected to be the first node");
1099 set_virtual_space_list(vsl->next());
1100 } else {
1101 prev_vsl->set_next(vsl->next());
1102 }
1103
1104 vsl->purge(chunk_manager);
1105 dec_reserved_words(vsl->reserved_words());
1106 dec_committed_words(vsl->committed_words());
1107 dec_virtual_space_count();
1108 purged_vsl = vsl;
1109 delete vsl;
1110 } else {
1111 prev_vsl = vsl;
1112 }
1113 }
1114 #ifdef ASSERT
1115 if (purged_vsl != NULL) {
1116 // List should be stable enough to use an iterator here.
1117 VirtualSpaceListIterator iter(virtual_space_list());
1118 while (iter.repeat()) {
1119 VirtualSpaceNode* vsl = iter.get_next();
1120 assert(vsl != purged_vsl, "Purge of vsl failed");
1121 }
1122 }
1123 #endif
1124 }
1125
1126
1127 // This function looks at the mmap regions in the metaspace without locking.
1128 // The chunks are added with store ordering and not deleted except for at
1129 // unloading time during a safepoint.
1130 bool VirtualSpaceList::contains(const void* ptr) {
1131 // List should be stable enough to use an iterator here because removing virtual
1132 // space nodes is only allowed at a safepoint.
1133 VirtualSpaceListIterator iter(virtual_space_list());
1134 while (iter.repeat()) {
1135 VirtualSpaceNode* vsn = iter.get_next();
1136 if (vsn->contains(ptr)) {
1137 return true;
1138 }
1139 }
1140 return false;
1141 }
1142
1143 void VirtualSpaceList::retire_current_virtual_space() {
1144 assert_lock_strong(SpaceManager::expand_lock());
1145
1146 VirtualSpaceNode* vsn = current_virtual_space();
1147
1148 ChunkManager* cm = is_class() ? Metaspace::chunk_manager_class() :
1149 Metaspace::chunk_manager_metadata();
1150
1151 vsn->retire(cm);
1152 }
1153
1154 void VirtualSpaceNode::retire(ChunkManager* chunk_manager) {
1155 for (int i = (int)MediumIndex; i >= (int)ZeroIndex; --i) {
1156 ChunkIndex index = (ChunkIndex)i;
1157 size_t chunk_size = chunk_manager->free_chunks(index)->size();
1158
1159 while (free_words_in_vs() >= chunk_size) {
1160 DEBUG_ONLY(verify_container_count();)
1161 Metachunk* chunk = get_chunk_vs(chunk_size);
1162 assert(chunk != NULL, "allocation should have been successful");
1163
1164 chunk_manager->return_chunks(index, chunk);
1165 chunk_manager->inc_free_chunks_total(chunk_size);
1166 DEBUG_ONLY(verify_container_count();)
1167 }
1168 }
1169 assert(free_words_in_vs() == 0, "should be empty now");
1170 }
1171
1172 VirtualSpaceList::VirtualSpaceList(size_t word_size) :
1173 _is_class(false),
1174 _virtual_space_list(NULL),
1175 _current_virtual_space(NULL),
1176 _reserved_words(0),
1177 _committed_words(0),
1178 _virtual_space_count(0) {
1179 MutexLockerEx cl(SpaceManager::expand_lock(),
1180 Mutex::_no_safepoint_check_flag);
1181 create_new_virtual_space(word_size);
1182 }
1183
1184 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
1185 _is_class(true),
1186 _virtual_space_list(NULL),
1187 _current_virtual_space(NULL),
1188 _reserved_words(0),
1189 _committed_words(0),
1190 _virtual_space_count(0) {
1191 MutexLockerEx cl(SpaceManager::expand_lock(),
1192 Mutex::_no_safepoint_check_flag);
1193 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
1194 bool succeeded = class_entry->initialize();
1195 if (succeeded) {
1196 link_vs(class_entry);
1197 }
1198 }
1199
1200 size_t VirtualSpaceList::free_bytes() {
1201 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
1202 }
1203
1204 // Allocate another meta virtual space and add it to the list.
1205 bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) {
1206 assert_lock_strong(SpaceManager::expand_lock());
1207
1208 if (is_class()) {
1209 assert(false, "We currently don't support more than one VirtualSpace for"
1210 " the compressed class space. The initialization of the"
1211 " CCS uses another code path and should not hit this path.");
1212 return false;
1213 }
1214
1215 if (vs_word_size == 0) {
1216 assert(false, "vs_word_size should always be at least _reserve_alignment large.");
1217 return false;
1218 }
1219
1220 // Reserve the space
1221 size_t vs_byte_size = vs_word_size * BytesPerWord;
1222 assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment());
1223
1224 // Allocate the meta virtual space and initialize it.
1225 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
1226 if (!new_entry->initialize()) {
1227 delete new_entry;
1228 return false;
1229 } else {
1230 assert(new_entry->reserved_words() == vs_word_size,
1231 "Reserved memory size differs from requested memory size");
1232 // ensure lock-free iteration sees fully initialized node
1233 OrderAccess::storestore();
1234 link_vs(new_entry);
1235 return true;
1236 }
1237 }
1238
1239 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) {
1240 if (virtual_space_list() == NULL) {
1241 set_virtual_space_list(new_entry);
1242 } else {
1243 current_virtual_space()->set_next(new_entry);
1244 }
1245 set_current_virtual_space(new_entry);
1246 inc_reserved_words(new_entry->reserved_words());
1247 inc_committed_words(new_entry->committed_words());
1248 inc_virtual_space_count();
1249 #ifdef ASSERT
1250 new_entry->mangle();
1251 #endif
1252 if (TraceMetavirtualspaceAllocation && Verbose) {
1253 VirtualSpaceNode* vsl = current_virtual_space();
1254 vsl->print_on(gclog_or_tty);
1255 }
1256 }
1257
1258 bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node,
1259 size_t min_words,
1260 size_t preferred_words) {
1261 size_t before = node->committed_words();
1262
1263 bool result = node->expand_by(min_words, preferred_words);
1264
1265 size_t after = node->committed_words();
1266
1267 // after and before can be the same if the memory was pre-committed.
1268 assert(after >= before, "Inconsistency");
1269 inc_committed_words(after - before);
1270
1271 return result;
1272 }
1273
1274 bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) {
1275 assert_is_size_aligned(min_words, Metaspace::commit_alignment_words());
1276 assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words());
1277 assert(min_words <= preferred_words, "Invalid arguments");
1278
1279 if (!MetaspaceGC::can_expand(min_words, this->is_class())) {
1280 return false;
1281 }
1282
1283 size_t allowed_expansion_words = MetaspaceGC::allowed_expansion();
1284 if (allowed_expansion_words < min_words) {
1285 return false;
1286 }
1287
1288 size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words);
1289
1290 // Commit more memory from the the current virtual space.
1291 bool vs_expanded = expand_node_by(current_virtual_space(),
1292 min_words,
1293 max_expansion_words);
1294 if (vs_expanded) {
1295 return true;
1296 }
1297 retire_current_virtual_space();
1298
1299 // Get another virtual space.
1300 size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words);
1301 grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words());
1302
1303 if (create_new_virtual_space(grow_vs_words)) {
1304 if (current_virtual_space()->is_pre_committed()) {
1305 // The memory was pre-committed, so we are done here.
1306 assert(min_words <= current_virtual_space()->committed_words(),
1307 "The new VirtualSpace was pre-committed, so it"
1308 "should be large enough to fit the alloc request.");
1309 return true;
1310 }
1311
1312 return expand_node_by(current_virtual_space(),
1313 min_words,
1314 max_expansion_words);
1315 }
1316
1317 return false;
1318 }
1319
1320 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
1321 size_t grow_chunks_by_words,
1322 size_t medium_chunk_bunch) {
1323
1324 // Allocate a chunk out of the current virtual space.
1325 Metachunk* next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
1326
1327 if (next != NULL) {
1328 return next;
1329 }
1330
1331 // The expand amount is currently only determined by the requested sizes
1332 // and not how much committed memory is left in the current virtual space.
1333
1334 size_t min_word_size = align_size_up(grow_chunks_by_words, Metaspace::commit_alignment_words());
1335 size_t preferred_word_size = align_size_up(medium_chunk_bunch, Metaspace::commit_alignment_words());
1336 if (min_word_size >= preferred_word_size) {
1337 // Can happen when humongous chunks are allocated.
1338 preferred_word_size = min_word_size;
1339 }
1340
1341 bool expanded = expand_by(min_word_size, preferred_word_size);
1342 if (expanded) {
1343 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
1344 assert(next != NULL, "The allocation was expected to succeed after the expansion");
1345 }
1346
1347 return next;
1348 }
1349
1350 void VirtualSpaceList::print_on(outputStream* st) const {
1351 if (TraceMetadataChunkAllocation && Verbose) {
1352 VirtualSpaceListIterator iter(virtual_space_list());
1353 while (iter.repeat()) {
1354 VirtualSpaceNode* node = iter.get_next();
1355 node->print_on(st);
1356 }
1357 }
1358 }
1359
1360 // MetaspaceGC methods
1361
1362 // VM_CollectForMetadataAllocation is the vm operation used to GC.
1363 // Within the VM operation after the GC the attempt to allocate the metadata
1364 // should succeed. If the GC did not free enough space for the metaspace
1365 // allocation, the HWM is increased so that another virtualspace will be
1366 // allocated for the metadata. With perm gen the increase in the perm
1367 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
1368 // metaspace policy uses those as the small and large steps for the HWM.
1369 //
1370 // After the GC the compute_new_size() for MetaspaceGC is called to
1371 // resize the capacity of the metaspaces. The current implementation
1372 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
1373 // to resize the Java heap by some GC's. New flags can be implemented
1374 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
1375 // free space is desirable in the metaspace capacity to decide how much
1376 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
1377 // free space is desirable in the metaspace capacity before decreasing
1378 // the HWM.
1379
1380 // Calculate the amount to increase the high water mark (HWM).
1381 // Increase by a minimum amount (MinMetaspaceExpansion) so that
1382 // another expansion is not requested too soon. If that is not
1383 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
1384 // If that is still not enough, expand by the size of the allocation
1385 // plus some.
1386 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
1387 size_t min_delta = MinMetaspaceExpansion;
1388 size_t max_delta = MaxMetaspaceExpansion;
1389 size_t delta = align_size_up(bytes, Metaspace::commit_alignment());
1390
1391 if (delta <= min_delta) {
1392 delta = min_delta;
1393 } else if (delta <= max_delta) {
1394 // Don't want to hit the high water mark on the next
1395 // allocation so make the delta greater than just enough
1396 // for this allocation.
1397 delta = max_delta;
1398 } else {
1399 // This allocation is large but the next ones are probably not
1400 // so increase by the minimum.
1401 delta = delta + min_delta;
1402 }
1403
1404 assert_is_size_aligned(delta, Metaspace::commit_alignment());
1405
1406 return delta;
1407 }
1408
1409 size_t MetaspaceGC::capacity_until_GC() {
1410 size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC);
1411 assert(value >= MetaspaceSize, "Not initialied properly?");
1412 return value;
1413 }
1414
1415 size_t MetaspaceGC::inc_capacity_until_GC(size_t v) {
1416 assert_is_size_aligned(v, Metaspace::commit_alignment());
1417
1418 size_t capacity_until_GC = (size_t) _capacity_until_GC;
1419 size_t new_value = capacity_until_GC + v;
1420
1421 if (new_value < capacity_until_GC) {
1422 // the addition wrapped around, set new_value to max value
1423 new_value = max_uintx;
1424 }
1425
1426 bool cas_succeeded = false;
1427 size_t num_retries = 5; // just to limit the number of CAS attempts
1428 for (size_t i = 0; i < num_retries; i++) {
1429 intptr_t cmp = (intptr_t) capacity_until_GC;
1430 intptr_t swap = (intptr_t) new_value;
1431 intptr_t prev = Atomic::cmpxchg_ptr(swap, &_capacity_until_GC, cmp);
1432
1433 if (prev == cmp) {
1434 cas_succeeded = true;
1435 break;
1436 }
1437 }
1438
1439 // if the CAS did not succeed, just return the current value
1440 return cas_succeeded ? new_value : _capacity_until_GC;
1441 }
1442
1443 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
1444 assert_is_size_aligned(v, Metaspace::commit_alignment());
1445
1446 return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC);
1447 }
1448
1449 void MetaspaceGC::initialize() {
1450 // Set the high-water mark to MaxMetapaceSize during VM initializaton since
1451 // we can't do a GC during initialization.
1452 _capacity_until_GC = MaxMetaspaceSize;
1453 }
1454
1455 void MetaspaceGC::post_initialize() {
1456 // Reset the high-water mark once the VM initialization is done.
1457 _capacity_until_GC = MAX2(MetaspaceAux::committed_bytes(), MetaspaceSize);
1458 }
1459
1460 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
1461 // Check if the compressed class space is full.
1462 if (is_class && Metaspace::using_class_space()) {
1463 size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);
1464 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
1465 return false;
1466 }
1467 }
1468
1469 // Check if the user has imposed a limit on the metaspace memory.
1470 size_t committed_bytes = MetaspaceAux::committed_bytes();
1471 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
1472 return false;
1473 }
1474
1475 return true;
1476 }
1477
1478 size_t MetaspaceGC::allowed_expansion() {
1479 size_t committed_bytes = MetaspaceAux::committed_bytes();
1480 size_t capacity_until_gc = capacity_until_GC();
1481
1482 assert(capacity_until_gc >= committed_bytes,
1483 err_msg("capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
1484 capacity_until_gc, committed_bytes));
1485
1486 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
1487 size_t left_until_GC = capacity_until_gc - committed_bytes;
1488 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
1489
1490 return left_to_commit / BytesPerWord;
1491 }
1492
1493 void MetaspaceGC::compute_new_size() {
1494 assert(_shrink_factor <= 100, "invalid shrink factor");
1495 uint current_shrink_factor = _shrink_factor;
1496 _shrink_factor = 0;
1497
1498 // Using committed_bytes() for used_after_gc is an overestimation, since the
1499 // chunk free lists are included in committed_bytes() and the memory in an
1500 // un-fragmented chunk free list is available for future allocations.
1501 // However, if the chunk free lists becomes fragmented, then the memory may
1502 // not be available for future allocations and the memory is therefore "in use".
1503 // Including the chunk free lists in the definition of "in use" is therefore
1504 // necessary. Not including the chunk free lists can cause capacity_until_GC to
1505 // shrink below committed_bytes() and this has caused serious bugs in the past.
1506 const size_t used_after_gc = MetaspaceAux::committed_bytes();
1507 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
1508
1509 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
1510 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
1511
1512 const double min_tmp = used_after_gc / maximum_used_percentage;
1513 size_t minimum_desired_capacity =
1514 (size_t)MIN2(min_tmp, double(max_uintx));
1515 // Don't shrink less than the initial generation size
1516 minimum_desired_capacity = MAX2(minimum_desired_capacity,
1517 MetaspaceSize);
1518
1519 if (PrintGCDetails && Verbose) {
1520 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
1521 gclog_or_tty->print_cr(" "
1522 " minimum_free_percentage: %6.2f"
1523 " maximum_used_percentage: %6.2f",
1524 minimum_free_percentage,
1525 maximum_used_percentage);
1526 gclog_or_tty->print_cr(" "
1527 " used_after_gc : %6.1fKB",
1528 used_after_gc / (double) K);
1529 }
1530
1531
1532 size_t shrink_bytes = 0;
1533 if (capacity_until_GC < minimum_desired_capacity) {
1534 // If we have less capacity below the metaspace HWM, then
1535 // increment the HWM.
1536 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
1537 expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment());
1538 // Don't expand unless it's significant
1539 if (expand_bytes >= MinMetaspaceExpansion) {
1540 size_t new_capacity_until_GC = MetaspaceGC::inc_capacity_until_GC(expand_bytes);
1541 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
1542 new_capacity_until_GC,
1543 MetaspaceGCThresholdUpdater::ComputeNewSize);
1544 if (PrintGCDetails && Verbose) {
1545 gclog_or_tty->print_cr(" expanding:"
1546 " minimum_desired_capacity: %6.1fKB"
1547 " expand_bytes: %6.1fKB"
1548 " MinMetaspaceExpansion: %6.1fKB"
1549 " new metaspace HWM: %6.1fKB",
1550 minimum_desired_capacity / (double) K,
1551 expand_bytes / (double) K,
1552 MinMetaspaceExpansion / (double) K,
1553 new_capacity_until_GC / (double) K);
1554 }
1555 }
1556 return;
1557 }
1558
1559 // No expansion, now see if we want to shrink
1560 // We would never want to shrink more than this
1561 assert(capacity_until_GC >= minimum_desired_capacity,
1562 err_msg(SIZE_FORMAT " >= " SIZE_FORMAT,
1563 capacity_until_GC, minimum_desired_capacity));
1564 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
1565
1566 // Should shrinking be considered?
1567 if (MaxMetaspaceFreeRatio < 100) {
1568 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
1569 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
1570 const double max_tmp = used_after_gc / minimum_used_percentage;
1571 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
1572 maximum_desired_capacity = MAX2(maximum_desired_capacity,
1573 MetaspaceSize);
1574 if (PrintGCDetails && Verbose) {
1575 gclog_or_tty->print_cr(" "
1576 " maximum_free_percentage: %6.2f"
1577 " minimum_used_percentage: %6.2f",
1578 maximum_free_percentage,
1579 minimum_used_percentage);
1580 gclog_or_tty->print_cr(" "
1581 " minimum_desired_capacity: %6.1fKB"
1582 " maximum_desired_capacity: %6.1fKB",
1583 minimum_desired_capacity / (double) K,
1584 maximum_desired_capacity / (double) K);
1585 }
1586
1587 assert(minimum_desired_capacity <= maximum_desired_capacity,
1588 "sanity check");
1589
1590 if (capacity_until_GC > maximum_desired_capacity) {
1591 // Capacity too large, compute shrinking size
1592 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
1593 // We don't want shrink all the way back to initSize if people call
1594 // System.gc(), because some programs do that between "phases" and then
1595 // we'd just have to grow the heap up again for the next phase. So we
1596 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
1597 // on the third call, and 100% by the fourth call. But if we recompute
1598 // size without shrinking, it goes back to 0%.
1599 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
1600
1601 shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment());
1602
1603 assert(shrink_bytes <= max_shrink_bytes,
1604 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
1605 shrink_bytes, max_shrink_bytes));
1606 if (current_shrink_factor == 0) {
1607 _shrink_factor = 10;
1608 } else {
1609 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
1610 }
1611 if (PrintGCDetails && Verbose) {
1612 gclog_or_tty->print_cr(" "
1613 " shrinking:"
1614 " initSize: %.1fK"
1615 " maximum_desired_capacity: %.1fK",
1616 MetaspaceSize / (double) K,
1617 maximum_desired_capacity / (double) K);
1618 gclog_or_tty->print_cr(" "
1619 " shrink_bytes: %.1fK"
1620 " current_shrink_factor: %d"
1621 " new shrink factor: %d"
1622 " MinMetaspaceExpansion: %.1fK",
1623 shrink_bytes / (double) K,
1624 current_shrink_factor,
1625 _shrink_factor,
1626 MinMetaspaceExpansion / (double) K);
1627 }
1628 }
1629 }
1630
1631 // Don't shrink unless it's significant
1632 if (shrink_bytes >= MinMetaspaceExpansion &&
1633 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
1634 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
1635 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
1636 new_capacity_until_GC,
1637 MetaspaceGCThresholdUpdater::ComputeNewSize);
1638 }
1639 }
1640
1641 // Metadebug methods
1642
1643 void Metadebug::init_allocation_fail_alot_count() {
1644 if (MetadataAllocationFailALot) {
1645 _allocation_fail_alot_count =
1646 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
1647 }
1648 }
1649
1650 #ifdef ASSERT
1651 bool Metadebug::test_metadata_failure() {
1652 if (MetadataAllocationFailALot &&
1653 Threads::is_vm_complete()) {
1654 if (_allocation_fail_alot_count > 0) {
1655 _allocation_fail_alot_count--;
1656 } else {
1657 if (TraceMetadataChunkAllocation && Verbose) {
1658 gclog_or_tty->print_cr("Metadata allocation failing for "
1659 "MetadataAllocationFailALot");
1660 }
1661 init_allocation_fail_alot_count();
1662 return true;
1663 }
1664 }
1665 return false;
1666 }
1667 #endif
1668
1669 // ChunkManager methods
1670
1671 size_t ChunkManager::free_chunks_total_words() {
1672 return _free_chunks_total;
1673 }
1674
1675 size_t ChunkManager::free_chunks_total_bytes() {
1676 return free_chunks_total_words() * BytesPerWord;
1677 }
1678
1679 size_t ChunkManager::free_chunks_count() {
1680 #ifdef ASSERT
1681 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
1682 MutexLockerEx cl(SpaceManager::expand_lock(),
1683 Mutex::_no_safepoint_check_flag);
1684 // This lock is only needed in debug because the verification
1685 // of the _free_chunks_totals walks the list of free chunks
1686 slow_locked_verify_free_chunks_count();
1687 }
1688 #endif
1689 return _free_chunks_count;
1690 }
1691
1692 void ChunkManager::locked_verify_free_chunks_total() {
1693 assert_lock_strong(SpaceManager::expand_lock());
1694 assert(sum_free_chunks() == _free_chunks_total,
1695 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
1696 " same as sum " SIZE_FORMAT, _free_chunks_total,
1697 sum_free_chunks()));
1698 }
1699
1700 void ChunkManager::verify_free_chunks_total() {
1701 MutexLockerEx cl(SpaceManager::expand_lock(),
1702 Mutex::_no_safepoint_check_flag);
1703 locked_verify_free_chunks_total();
1704 }
1705
1706 void ChunkManager::locked_verify_free_chunks_count() {
1707 assert_lock_strong(SpaceManager::expand_lock());
1708 assert(sum_free_chunks_count() == _free_chunks_count,
1709 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
1710 " same as sum " SIZE_FORMAT, _free_chunks_count,
1711 sum_free_chunks_count()));
1712 }
1713
1714 void ChunkManager::verify_free_chunks_count() {
1715 #ifdef ASSERT
1716 MutexLockerEx cl(SpaceManager::expand_lock(),
1717 Mutex::_no_safepoint_check_flag);
1718 locked_verify_free_chunks_count();
1719 #endif
1720 }
1721
1722 void ChunkManager::verify() {
1723 MutexLockerEx cl(SpaceManager::expand_lock(),
1724 Mutex::_no_safepoint_check_flag);
1725 locked_verify();
1726 }
1727
1728 void ChunkManager::locked_verify() {
1729 locked_verify_free_chunks_count();
1730 locked_verify_free_chunks_total();
1731 }
1732
1733 void ChunkManager::locked_print_free_chunks(outputStream* st) {
1734 assert_lock_strong(SpaceManager::expand_lock());
1735 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
1736 _free_chunks_total, _free_chunks_count);
1737 }
1738
1739 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
1740 assert_lock_strong(SpaceManager::expand_lock());
1741 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
1742 sum_free_chunks(), sum_free_chunks_count());
1743 }
1744 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
1745 return &_free_chunks[index];
1746 }
1747
1748 // These methods that sum the free chunk lists are used in printing
1749 // methods that are used in product builds.
1750 size_t ChunkManager::sum_free_chunks() {
1751 assert_lock_strong(SpaceManager::expand_lock());
1752 size_t result = 0;
1753 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
1754 ChunkList* list = free_chunks(i);
1755
1756 if (list == NULL) {
1757 continue;
1758 }
1759
1760 result = result + list->count() * list->size();
1761 }
1762 result = result + humongous_dictionary()->total_size();
1763 return result;
1764 }
1765
1766 size_t ChunkManager::sum_free_chunks_count() {
1767 assert_lock_strong(SpaceManager::expand_lock());
1768 size_t count = 0;
1769 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
1770 ChunkList* list = free_chunks(i);
1771 if (list == NULL) {
1772 continue;
1773 }
1774 count = count + list->count();
1775 }
1776 count = count + humongous_dictionary()->total_free_blocks();
1777 return count;
1778 }
1779
1780 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
1781 ChunkIndex index = list_index(word_size);
1782 assert(index < HumongousIndex, "No humongous list");
1783 return free_chunks(index);
1784 }
1785
1786 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
1787 assert_lock_strong(SpaceManager::expand_lock());
1788
1789 slow_locked_verify();
1790
1791 Metachunk* chunk = NULL;
1792 if (list_index(word_size) != HumongousIndex) {
1793 ChunkList* free_list = find_free_chunks_list(word_size);
1794 assert(free_list != NULL, "Sanity check");
1795
1796 chunk = free_list->head();
1797
1798 if (chunk == NULL) {
1799 return NULL;
1800 }
1801
1802 // Remove the chunk as the head of the list.
1803 free_list->remove_chunk(chunk);
1804
1805 if (TraceMetadataChunkAllocation && Verbose) {
1806 gclog_or_tty->print_cr("ChunkManager::free_chunks_get: free_list "
1807 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
1808 free_list, chunk, chunk->word_size());
1809 }
1810 } else {
1811 chunk = humongous_dictionary()->get_chunk(
1812 word_size,
1813 FreeBlockDictionary<Metachunk>::atLeast);
1814
1815 if (chunk == NULL) {
1816 return NULL;
1817 }
1818
1819 if (TraceMetadataHumongousAllocation) {
1820 size_t waste = chunk->word_size() - word_size;
1821 gclog_or_tty->print_cr("Free list allocate humongous chunk size "
1822 SIZE_FORMAT " for requested size " SIZE_FORMAT
1823 " waste " SIZE_FORMAT,
1824 chunk->word_size(), word_size, waste);
1825 }
1826 }
1827
1828 // Chunk is being removed from the chunks free list.
1829 dec_free_chunks_total(chunk->word_size());
1830
1831 // Remove it from the links to this freelist
1832 chunk->set_next(NULL);
1833 chunk->set_prev(NULL);
1834 #ifdef ASSERT
1835 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
1836 // work.
1837 chunk->set_is_tagged_free(false);
1838 #endif
1839 chunk->container()->inc_container_count();
1840
1841 slow_locked_verify();
1842 return chunk;
1843 }
1844
1845 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
1846 assert_lock_strong(SpaceManager::expand_lock());
1847 slow_locked_verify();
1848
1849 // Take from the beginning of the list
1850 Metachunk* chunk = free_chunks_get(word_size);
1851 if (chunk == NULL) {
1852 return NULL;
1853 }
1854
1855 assert((word_size <= chunk->word_size()) ||
1856 list_index(chunk->word_size() == HumongousIndex),
1857 "Non-humongous variable sized chunk");
1858 if (TraceMetadataChunkAllocation) {
1859 size_t list_count;
1860 if (list_index(word_size) < HumongousIndex) {
1861 ChunkList* list = find_free_chunks_list(word_size);
1862 list_count = list->count();
1863 } else {
1864 list_count = humongous_dictionary()->total_count();
1865 }
1866 gclog_or_tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
1867 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
1868 this, chunk, chunk->word_size(), list_count);
1869 locked_print_free_chunks(gclog_or_tty);
1870 }
1871
1872 return chunk;
1873 }
1874
1875 void ChunkManager::print_on(outputStream* out) const {
1876 if (PrintFLSStatistics != 0) {
1877 const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics();
1878 }
1879 }
1880
1881 // SpaceManager methods
1882
1883 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
1884 size_t* chunk_word_size,
1885 size_t* class_chunk_word_size) {
1886 switch (type) {
1887 case Metaspace::BootMetaspaceType:
1888 *chunk_word_size = Metaspace::first_chunk_word_size();
1889 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
1890 break;
1891 case Metaspace::ROMetaspaceType:
1892 *chunk_word_size = SharedReadOnlySize / wordSize;
1893 *class_chunk_word_size = ClassSpecializedChunk;
1894 break;
1895 case Metaspace::ReadWriteMetaspaceType:
1896 *chunk_word_size = SharedReadWriteSize / wordSize;
1897 *class_chunk_word_size = ClassSpecializedChunk;
1898 break;
1899 case Metaspace::AnonymousMetaspaceType:
1900 case Metaspace::ReflectionMetaspaceType:
1901 *chunk_word_size = SpecializedChunk;
1902 *class_chunk_word_size = ClassSpecializedChunk;
1903 break;
1904 default:
1905 *chunk_word_size = SmallChunk;
1906 *class_chunk_word_size = ClassSmallChunk;
1907 break;
1908 }
1909 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
1910 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
1911 " class " SIZE_FORMAT,
1912 *chunk_word_size, *class_chunk_word_size));
1913 }
1914
1915 size_t SpaceManager::sum_free_in_chunks_in_use() const {
1916 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1917 size_t free = 0;
1918 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1919 Metachunk* chunk = chunks_in_use(i);
1920 while (chunk != NULL) {
1921 free += chunk->free_word_size();
1922 chunk = chunk->next();
1923 }
1924 }
1925 return free;
1926 }
1927
1928 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
1929 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1930 size_t result = 0;
1931 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1932 result += sum_waste_in_chunks_in_use(i);
1933 }
1934
1935 return result;
1936 }
1937
1938 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
1939 size_t result = 0;
1940 Metachunk* chunk = chunks_in_use(index);
1941 // Count the free space in all the chunk but not the
1942 // current chunk from which allocations are still being done.
1943 while (chunk != NULL) {
1944 if (chunk != current_chunk()) {
1945 result += chunk->free_word_size();
1946 }
1947 chunk = chunk->next();
1948 }
1949 return result;
1950 }
1951
1952 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
1953 // For CMS use "allocated_chunks_words()" which does not need the
1954 // Metaspace lock. For the other collectors sum over the
1955 // lists. Use both methods as a check that "allocated_chunks_words()"
1956 // is correct. That is, sum_capacity_in_chunks() is too expensive
1957 // to use in the product and allocated_chunks_words() should be used
1958 // but allow for checking that allocated_chunks_words() returns the same
1959 // value as sum_capacity_in_chunks_in_use() which is the definitive
1960 // answer.
1961 if (UseConcMarkSweepGC) {
1962 return allocated_chunks_words();
1963 } else {
1964 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1965 size_t sum = 0;
1966 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1967 Metachunk* chunk = chunks_in_use(i);
1968 while (chunk != NULL) {
1969 sum += chunk->word_size();
1970 chunk = chunk->next();
1971 }
1972 }
1973 return sum;
1974 }
1975 }
1976
1977 size_t SpaceManager::sum_count_in_chunks_in_use() {
1978 size_t count = 0;
1979 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1980 count = count + sum_count_in_chunks_in_use(i);
1981 }
1982
1983 return count;
1984 }
1985
1986 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
1987 size_t count = 0;
1988 Metachunk* chunk = chunks_in_use(i);
1989 while (chunk != NULL) {
1990 count++;
1991 chunk = chunk->next();
1992 }
1993 return count;
1994 }
1995
1996
1997 size_t SpaceManager::sum_used_in_chunks_in_use() const {
1998 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1999 size_t used = 0;
2000 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2001 Metachunk* chunk = chunks_in_use(i);
2002 while (chunk != NULL) {
2003 used += chunk->used_word_size();
2004 chunk = chunk->next();
2005 }
2006 }
2007 return used;
2008 }
2009
2010 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
2011
2012 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2013 Metachunk* chunk = chunks_in_use(i);
2014 st->print("SpaceManager: %s " PTR_FORMAT,
2015 chunk_size_name(i), chunk);
2016 if (chunk != NULL) {
2017 st->print_cr(" free " SIZE_FORMAT,
2018 chunk->free_word_size());
2019 } else {
2020 st->cr();
2021 }
2022 }
2023
2024 chunk_manager()->locked_print_free_chunks(st);
2025 chunk_manager()->locked_print_sum_free_chunks(st);
2026 }
2027
2028 size_t SpaceManager::calc_chunk_size(size_t word_size) {
2029
2030 // Decide between a small chunk and a medium chunk. Up to
2031 // _small_chunk_limit small chunks can be allocated but
2032 // once a medium chunk has been allocated, no more small
2033 // chunks will be allocated.
2034 size_t chunk_word_size;
2035 if (chunks_in_use(MediumIndex) == NULL &&
2036 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) {
2037 chunk_word_size = (size_t) small_chunk_size();
2038 if (word_size + Metachunk::overhead() > small_chunk_size()) {
2039 chunk_word_size = medium_chunk_size();
2040 }
2041 } else {
2042 chunk_word_size = medium_chunk_size();
2043 }
2044
2045 // Might still need a humongous chunk. Enforce
2046 // humongous allocations sizes to be aligned up to
2047 // the smallest chunk size.
2048 size_t if_humongous_sized_chunk =
2049 align_size_up(word_size + Metachunk::overhead(),
2050 smallest_chunk_size());
2051 chunk_word_size =
2052 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
2053
2054 assert(!SpaceManager::is_humongous(word_size) ||
2055 chunk_word_size == if_humongous_sized_chunk,
2056 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
2057 " chunk_word_size " SIZE_FORMAT,
2058 word_size, chunk_word_size));
2059 if (TraceMetadataHumongousAllocation &&
2060 SpaceManager::is_humongous(word_size)) {
2061 gclog_or_tty->print_cr("Metadata humongous allocation:");
2062 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
2063 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
2064 chunk_word_size);
2065 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
2066 Metachunk::overhead());
2067 }
2068 return chunk_word_size;
2069 }
2070
2071 void SpaceManager::track_metaspace_memory_usage() {
2072 if (is_init_completed()) {
2073 if (is_class()) {
2074 MemoryService::track_compressed_class_memory_usage();
2075 }
2076 MemoryService::track_metaspace_memory_usage();
2077 }
2078 }
2079
2080 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
2081 assert(vs_list()->current_virtual_space() != NULL,
2082 "Should have been set");
2083 assert(current_chunk() == NULL ||
2084 current_chunk()->allocate(word_size) == NULL,
2085 "Don't need to expand");
2086 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
2087
2088 if (TraceMetadataChunkAllocation && Verbose) {
2089 size_t words_left = 0;
2090 size_t words_used = 0;
2091 if (current_chunk() != NULL) {
2092 words_left = current_chunk()->free_word_size();
2093 words_used = current_chunk()->used_word_size();
2094 }
2095 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
2096 " words " SIZE_FORMAT " words used " SIZE_FORMAT
2097 " words left",
2098 word_size, words_used, words_left);
2099 }
2100
2101 // Get another chunk out of the virtual space
2102 size_t grow_chunks_by_words = calc_chunk_size(word_size);
2103 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
2104
2105 MetaWord* mem = NULL;
2106
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 }
2114
2115 // Track metaspace memory usage statistic.
2116 track_metaspace_memory_usage();
2117
2118 return mem;
2119 }
2120
2121 void SpaceManager::print_on(outputStream* st) const {
2122
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 }
2141
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 }
2152
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 }
2168
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 }
2175
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 }
2182
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 }
2193
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;
2202
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 DEBUG_ONLY(cur->set_is_tagged_free(true);)
2214 list->return_chunk_at_head(cur);
2215 cur = next;
2216 }
2217 }
2218
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()));
2225
2226 MutexLockerEx fcl(SpaceManager::expand_lock(),
2227 Mutex::_no_safepoint_check_flag);
2228
2229 chunk_manager()->slow_locked_verify();
2230
2231 dec_total_from_size_metrics();
2232
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 }
2237
2238 // Do not mangle freed Metachunks. The chunk size inside Metachunks
2239 // is during the freeing of a VirtualSpaceNodes.
2240
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());
2245
2246 // Add all the chunks in use by this space manager
2247 // to the global list of free chunks.
2248
2249 // Follow each list of chunks-in-use and add them to the
2250 // free lists. Each list is NULL terminated.
2251
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 }
2268
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.
2272
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);
2282
2283 while (humongous_chunks != NULL) {
2284 #ifdef ASSERT
2285 humongous_chunks->set_is_tagged_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 smallest_chunk_size()),
2295 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
2296 " granularity %d",
2297 humongous_chunks->word_size(), smallest_chunk_size()));
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->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 }
2311
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 }
2326
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 }
2345
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<Metablock> >::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 }
2354
2355 // Adds a chunk to the list of chunks in use.
2356 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
2357
2358 assert(new_chunk != NULL, "Should not be NULL");
2359 assert(new_chunk->next() == NULL, "Should not be on a list");
2360
2361 new_chunk->reset_empty();
2362
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());
2366
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);
2386
2387 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
2388 }
2389
2390 // Add to the running sum of capacity
2391 inc_size_metrics(new_chunk->word_size());
2392
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 }
2401
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<Metablock> >::min_size()) {
2406 block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words);
2407 inc_used_metrics(remaining_words);
2408 }
2409 }
2410 }
2411
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);
2416
2417 if (next == NULL) {
2418 next = vs_list()->get_new_chunk(word_size,
2419 grow_chunks_by_words,
2420 medium_chunk_bunch());
2421 }
2422
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 }
2428
2429 return next;
2430 }
2431
2432 MetaWord* SpaceManager::allocate(size_t word_size) {
2433 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
2434
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
2450 return p;
2451 }
2452
2453 // Returns the address of spaced allocated for "word_size".
2454 // This methods does not know about blocks (Metablocks)
2455 MetaWord* SpaceManager::allocate_work(size_t word_size) {
2456 assert_lock_strong(_lock);
2457 #ifdef ASSERT
2458 if (Metadebug::test_metadata_failure()) {
2459 return NULL;
2460 }
2461 #endif
2462 // Is there space in the current chunk?
2463 MetaWord* result = NULL;
2464
2465 // For DumpSharedSpaces, only allocate out of the current chunk which is
2466 // never null because we gave it the size we wanted. Caller reports out
2467 // of memory if this returns null.
2468 if (DumpSharedSpaces) {
2469 assert(current_chunk() != NULL, "should never happen");
2470 inc_used_metrics(word_size);
2471 return current_chunk()->allocate(word_size); // caller handles null result
2472 }
2473
2474 if (current_chunk() != NULL) {
2475 result = current_chunk()->allocate(word_size);
2476 }
2477
2478 if (result == NULL) {
2479 result = grow_and_allocate(word_size);
2480 }
2481
2482 if (result != NULL) {
2483 inc_used_metrics(word_size);
2484 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
2485 "Head of the list is being allocated");
2486 }
2487
2488 return result;
2489 }
2490
2491 void SpaceManager::verify() {
2492 // If there are blocks in the dictionary, then
2493 // verification of chunks does not work since
2494 // being in the dictionary alters a chunk.
2495 if (block_freelists()->total_size() == 0) {
2496 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2497 Metachunk* curr = chunks_in_use(i);
2498 while (curr != NULL) {
2499 curr->verify();
2500 verify_chunk_size(curr);
2501 curr = curr->next();
2502 }
2503 }
2504 }
2505 }
2506
2507 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
2508 assert(is_humongous(chunk->word_size()) ||
2509 chunk->word_size() == medium_chunk_size() ||
2510 chunk->word_size() == small_chunk_size() ||
2511 chunk->word_size() == specialized_chunk_size(),
2512 "Chunk size is wrong");
2513 return;
2514 }
2515
2516 #ifdef ASSERT
2517 void SpaceManager::verify_allocated_blocks_words() {
2518 // Verification is only guaranteed at a safepoint.
2519 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
2520 "Verification can fail if the applications is running");
2521 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
2522 err_msg("allocation total is not consistent " SIZE_FORMAT
2523 " vs " SIZE_FORMAT,
2524 allocated_blocks_words(), sum_used_in_chunks_in_use()));
2525 }
2526
2527 #endif
2528
2529 void SpaceManager::dump(outputStream* const out) const {
2530 size_t curr_total = 0;
2531 size_t waste = 0;
2532 uint i = 0;
2533 size_t used = 0;
2534 size_t capacity = 0;
2535
2536 // Add up statistics for all chunks in this SpaceManager.
2537 for (ChunkIndex index = ZeroIndex;
2538 index < NumberOfInUseLists;
2539 index = next_chunk_index(index)) {
2540 for (Metachunk* curr = chunks_in_use(index);
2541 curr != NULL;
2542 curr = curr->next()) {
2543 out->print("%d) ", i++);
2544 curr->print_on(out);
2545 curr_total += curr->word_size();
2546 used += curr->used_word_size();
2547 capacity += curr->word_size();
2548 waste += curr->free_word_size() + curr->overhead();;
2549 }
2550 }
2551
2552 if (TraceMetadataChunkAllocation && Verbose) {
2553 block_freelists()->print_on(out);
2554 }
2555
2556 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
2557 // Free space isn't wasted.
2558 waste -= free;
2559
2560 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
2561 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
2562 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
2563 }
2564
2565 #ifndef PRODUCT
2566 void SpaceManager::mangle_freed_chunks() {
2567 for (ChunkIndex index = ZeroIndex;
2568 index < NumberOfInUseLists;
2569 index = next_chunk_index(index)) {
2570 for (Metachunk* curr = chunks_in_use(index);
2571 curr != NULL;
2572 curr = curr->next()) {
2573 curr->mangle();
2574 }
2575 }
2576 }
2577 #endif // PRODUCT
2578
2579 // MetaspaceAux
2580
2581
2582 size_t MetaspaceAux::_capacity_words[] = {0, 0};
2583 size_t MetaspaceAux::_used_words[] = {0, 0};
2584
2585 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
2586 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2587 return list == NULL ? 0 : list->free_bytes();
2588 }
2589
2590 size_t MetaspaceAux::free_bytes() {
2591 return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
2592 }
2593
2594 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
2595 assert_lock_strong(SpaceManager::expand_lock());
2596 assert(words <= capacity_words(mdtype),
2597 err_msg("About to decrement below 0: words " SIZE_FORMAT
2598 " is greater than _capacity_words[%u] " SIZE_FORMAT,
2599 words, mdtype, capacity_words(mdtype)));
2600 _capacity_words[mdtype] -= words;
2601 }
2602
2603 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
2604 assert_lock_strong(SpaceManager::expand_lock());
2605 // Needs to be atomic
2606 _capacity_words[mdtype] += words;
2607 }
2608
2609 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
2610 assert(words <= used_words(mdtype),
2611 err_msg("About to decrement below 0: words " SIZE_FORMAT
2612 " is greater than _used_words[%u] " SIZE_FORMAT,
2613 words, mdtype, used_words(mdtype)));
2614 // For CMS deallocation of the Metaspaces occurs during the
2615 // sweep which is a concurrent phase. Protection by the expand_lock()
2616 // is not enough since allocation is on a per Metaspace basis
2617 // and protected by the Metaspace lock.
2618 jlong minus_words = (jlong) - (jlong) words;
2619 Atomic::add_ptr(minus_words, &_used_words[mdtype]);
2620 }
2621
2622 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
2623 // _used_words tracks allocations for
2624 // each piece of metadata. Those allocations are
2625 // generally done concurrently by different application
2626 // threads so must be done atomically.
2627 Atomic::add_ptr(words, &_used_words[mdtype]);
2628 }
2629
2630 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
2631 size_t used = 0;
2632 ClassLoaderDataGraphMetaspaceIterator iter;
2633 while (iter.repeat()) {
2634 Metaspace* msp = iter.get_next();
2635 // Sum allocated_blocks_words for each metaspace
2636 if (msp != NULL) {
2637 used += msp->used_words_slow(mdtype);
2638 }
2639 }
2640 return used * BytesPerWord;
2641 }
2642
2643 size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) {
2644 size_t free = 0;
2645 ClassLoaderDataGraphMetaspaceIterator iter;
2646 while (iter.repeat()) {
2647 Metaspace* msp = iter.get_next();
2648 if (msp != NULL) {
2649 free += msp->free_words_slow(mdtype);
2650 }
2651 }
2652 return free * BytesPerWord;
2653 }
2654
2655 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
2656 if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
2657 return 0;
2658 }
2659 // Don't count the space in the freelists. That space will be
2660 // added to the capacity calculation as needed.
2661 size_t capacity = 0;
2662 ClassLoaderDataGraphMetaspaceIterator iter;
2663 while (iter.repeat()) {
2664 Metaspace* msp = iter.get_next();
2665 if (msp != NULL) {
2666 capacity += msp->capacity_words_slow(mdtype);
2667 }
2668 }
2669 return capacity * BytesPerWord;
2670 }
2671
2672 size_t MetaspaceAux::capacity_bytes_slow() {
2673 #ifdef PRODUCT
2674 // Use capacity_bytes() in PRODUCT instead of this function.
2675 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
2676 #endif
2677 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
2678 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
2679 assert(capacity_bytes() == class_capacity + non_class_capacity,
2680 err_msg("bad accounting: capacity_bytes() " SIZE_FORMAT
2681 " class_capacity + non_class_capacity " SIZE_FORMAT
2682 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
2683 capacity_bytes(), class_capacity + non_class_capacity,
2684 class_capacity, non_class_capacity));
2685
2686 return class_capacity + non_class_capacity;
2687 }
2688
2689 size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) {
2690 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2691 return list == NULL ? 0 : list->reserved_bytes();
2692 }
2693
2694 size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) {
2695 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2696 return list == NULL ? 0 : list->committed_bytes();
2697 }
2698
2699 size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
2700
2701 size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) {
2702 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
2703 if (chunk_manager == NULL) {
2704 return 0;
2705 }
2706 chunk_manager->slow_verify();
2707 return chunk_manager->free_chunks_total_words();
2708 }
2709
2710 size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
2711 return free_chunks_total_words(mdtype) * BytesPerWord;
2712 }
2713
2714 size_t MetaspaceAux::free_chunks_total_words() {
2715 return free_chunks_total_words(Metaspace::ClassType) +
2716 free_chunks_total_words(Metaspace::NonClassType);
2717 }
2718
2719 size_t MetaspaceAux::free_chunks_total_bytes() {
2720 return free_chunks_total_words() * BytesPerWord;
2721 }
2722
2723 bool MetaspaceAux::has_chunk_free_list(Metaspace::MetadataType mdtype) {
2724 return Metaspace::get_chunk_manager(mdtype) != NULL;
2725 }
2726
2727 MetaspaceChunkFreeListSummary MetaspaceAux::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
2728 if (!has_chunk_free_list(mdtype)) {
2729 return MetaspaceChunkFreeListSummary();
2730 }
2731
2732 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
2733 return cm->chunk_free_list_summary();
2734 }
2735
2736 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
2737 gclog_or_tty->print(", [Metaspace:");
2738 if (PrintGCDetails && Verbose) {
2739 gclog_or_tty->print(" " SIZE_FORMAT
2740 "->" SIZE_FORMAT
2741 "(" SIZE_FORMAT ")",
2742 prev_metadata_used,
2743 used_bytes(),
2744 reserved_bytes());
2745 } else {
2746 gclog_or_tty->print(" " SIZE_FORMAT "K"
2747 "->" SIZE_FORMAT "K"
2748 "(" SIZE_FORMAT "K)",
2749 prev_metadata_used/K,
2750 used_bytes()/K,
2751 reserved_bytes()/K);
2752 }
2753
2754 gclog_or_tty->print("]");
2755 }
2756
2757 // This is printed when PrintGCDetails
2758 void MetaspaceAux::print_on(outputStream* out) {
2759 Metaspace::MetadataType nct = Metaspace::NonClassType;
2760
2761 out->print_cr(" Metaspace "
2762 "used " SIZE_FORMAT "K, "
2763 "capacity " SIZE_FORMAT "K, "
2764 "committed " SIZE_FORMAT "K, "
2765 "reserved " SIZE_FORMAT "K",
2766 used_bytes()/K,
2767 capacity_bytes()/K,
2768 committed_bytes()/K,
2769 reserved_bytes()/K);
2770
2771 if (Metaspace::using_class_space()) {
2772 Metaspace::MetadataType ct = Metaspace::ClassType;
2773 out->print_cr(" class space "
2774 "used " SIZE_FORMAT "K, "
2775 "capacity " SIZE_FORMAT "K, "
2776 "committed " SIZE_FORMAT "K, "
2777 "reserved " SIZE_FORMAT "K",
2778 used_bytes(ct)/K,
2779 capacity_bytes(ct)/K,
2780 committed_bytes(ct)/K,
2781 reserved_bytes(ct)/K);
2782 }
2783 }
2784
2785 // Print information for class space and data space separately.
2786 // This is almost the same as above.
2787 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
2788 size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
2789 size_t capacity_bytes = capacity_bytes_slow(mdtype);
2790 size_t used_bytes = used_bytes_slow(mdtype);
2791 size_t free_bytes = free_bytes_slow(mdtype);
2792 size_t used_and_free = used_bytes + free_bytes +
2793 free_chunks_capacity_bytes;
2794 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
2795 "K + unused in chunks " SIZE_FORMAT "K + "
2796 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
2797 "K capacity in allocated chunks " SIZE_FORMAT "K",
2798 used_bytes / K,
2799 free_bytes / K,
2800 free_chunks_capacity_bytes / K,
2801 used_and_free / K,
2802 capacity_bytes / K);
2803 // Accounting can only be correct if we got the values during a safepoint
2804 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
2805 }
2806
2807 // Print total fragmentation for class metaspaces
2808 void MetaspaceAux::print_class_waste(outputStream* out) {
2809 assert(Metaspace::using_class_space(), "class metaspace not used");
2810 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
2811 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
2812 ClassLoaderDataGraphMetaspaceIterator iter;
2813 while (iter.repeat()) {
2814 Metaspace* msp = iter.get_next();
2815 if (msp != NULL) {
2816 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
2817 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
2818 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
2819 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
2820 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
2821 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
2822 cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
2823 }
2824 }
2825 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
2826 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
2827 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
2828 "large count " SIZE_FORMAT,
2829 cls_specialized_count, cls_specialized_waste,
2830 cls_small_count, cls_small_waste,
2831 cls_medium_count, cls_medium_waste, cls_humongous_count);
2832 }
2833
2834 // Print total fragmentation for data and class metaspaces separately
2835 void MetaspaceAux::print_waste(outputStream* out) {
2836 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
2837 size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
2838
2839 ClassLoaderDataGraphMetaspaceIterator iter;
2840 while (iter.repeat()) {
2841 Metaspace* msp = iter.get_next();
2842 if (msp != NULL) {
2843 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
2844 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
2845 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
2846 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
2847 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
2848 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
2849 humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
2850 }
2851 }
2852 out->print_cr("Total fragmentation waste (words) doesn't count free space");
2853 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
2854 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
2855 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
2856 "large count " SIZE_FORMAT,
2857 specialized_count, specialized_waste, small_count,
2858 small_waste, medium_count, medium_waste, humongous_count);
2859 if (Metaspace::using_class_space()) {
2860 print_class_waste(out);
2861 }
2862 }
2863
2864 // Dump global metaspace things from the end of ClassLoaderDataGraph
2865 void MetaspaceAux::dump(outputStream* out) {
2866 out->print_cr("All Metaspace:");
2867 out->print("data space: "); print_on(out, Metaspace::NonClassType);
2868 out->print("class space: "); print_on(out, Metaspace::ClassType);
2869 print_waste(out);
2870 }
2871
2872 void MetaspaceAux::verify_free_chunks() {
2873 Metaspace::chunk_manager_metadata()->verify();
2874 if (Metaspace::using_class_space()) {
2875 Metaspace::chunk_manager_class()->verify();
2876 }
2877 }
2878
2879 void MetaspaceAux::verify_capacity() {
2880 #ifdef ASSERT
2881 size_t running_sum_capacity_bytes = capacity_bytes();
2882 // For purposes of the running sum of capacity, verify against capacity
2883 size_t capacity_in_use_bytes = capacity_bytes_slow();
2884 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
2885 err_msg("capacity_words() * BytesPerWord " SIZE_FORMAT
2886 " capacity_bytes_slow()" SIZE_FORMAT,
2887 running_sum_capacity_bytes, capacity_in_use_bytes));
2888 for (Metaspace::MetadataType i = Metaspace::ClassType;
2889 i < Metaspace:: MetadataTypeCount;
2890 i = (Metaspace::MetadataType)(i + 1)) {
2891 size_t capacity_in_use_bytes = capacity_bytes_slow(i);
2892 assert(capacity_bytes(i) == capacity_in_use_bytes,
2893 err_msg("capacity_bytes(%u) " SIZE_FORMAT
2894 " capacity_bytes_slow(%u)" SIZE_FORMAT,
2895 i, capacity_bytes(i), i, capacity_in_use_bytes));
2896 }
2897 #endif
2898 }
2899
2900 void MetaspaceAux::verify_used() {
2901 #ifdef ASSERT
2902 size_t running_sum_used_bytes = used_bytes();
2903 // For purposes of the running sum of used, verify against used
2904 size_t used_in_use_bytes = used_bytes_slow();
2905 assert(used_bytes() == used_in_use_bytes,
2906 err_msg("used_bytes() " SIZE_FORMAT
2907 " used_bytes_slow()" SIZE_FORMAT,
2908 used_bytes(), used_in_use_bytes));
2909 for (Metaspace::MetadataType i = Metaspace::ClassType;
2910 i < Metaspace:: MetadataTypeCount;
2911 i = (Metaspace::MetadataType)(i + 1)) {
2912 size_t used_in_use_bytes = used_bytes_slow(i);
2913 assert(used_bytes(i) == used_in_use_bytes,
2914 err_msg("used_bytes(%u) " SIZE_FORMAT
2915 " used_bytes_slow(%u)" SIZE_FORMAT,
2916 i, used_bytes(i), i, used_in_use_bytes));
2917 }
2918 #endif
2919 }
2920
2921 void MetaspaceAux::verify_metrics() {
2922 verify_capacity();
2923 verify_used();
2924 }
2925
2926
2927 // Metaspace methods
2928
2929 size_t Metaspace::_first_chunk_word_size = 0;
2930 size_t Metaspace::_first_class_chunk_word_size = 0;
2931
2932 size_t Metaspace::_commit_alignment = 0;
2933 size_t Metaspace::_reserve_alignment = 0;
2934
2935 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
2936 initialize(lock, type);
2937 }
2938
2939 Metaspace::~Metaspace() {
2940 delete _vsm;
2941 if (using_class_space()) {
2942 delete _class_vsm;
2943 }
2944 }
2945
2946 VirtualSpaceList* Metaspace::_space_list = NULL;
2947 VirtualSpaceList* Metaspace::_class_space_list = NULL;
2948
2949 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
2950 ChunkManager* Metaspace::_chunk_manager_class = NULL;
2951
2952 #define VIRTUALSPACEMULTIPLIER 2
2953
2954 #ifdef _LP64
2955 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
2956
2957 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
2958 // Figure out the narrow_klass_base and the narrow_klass_shift. The
2959 // narrow_klass_base is the lower of the metaspace base and the cds base
2960 // (if cds is enabled). The narrow_klass_shift depends on the distance
2961 // between the lower base and higher address.
2962 address lower_base;
2963 address higher_address;
2964 if (UseSharedSpaces) {
2965 higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
2966 (address)(metaspace_base + compressed_class_space_size()));
2967 lower_base = MIN2(metaspace_base, cds_base);
2968 } else {
2969 higher_address = metaspace_base + compressed_class_space_size();
2970 lower_base = metaspace_base;
2971
2972 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
2973 // If compressed class space fits in lower 32G, we don't need a base.
2974 if (higher_address <= (address)klass_encoding_max) {
2975 lower_base = 0; // Effectively lower base is zero.
2976 }
2977 }
2978
2979 Universe::set_narrow_klass_base(lower_base);
2980
2981 if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
2982 Universe::set_narrow_klass_shift(0);
2983 } else {
2984 assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
2985 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
2986 }
2987 }
2988
2989 // Return TRUE if the specified metaspace_base and cds_base are close enough
2990 // to work with compressed klass pointers.
2991 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
2992 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
2993 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
2994 address lower_base = MIN2((address)metaspace_base, cds_base);
2995 address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
2996 (address)(metaspace_base + compressed_class_space_size()));
2997 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
2998 }
2999
3000 // Try to allocate the metaspace at the requested addr.
3001 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
3002 assert(using_class_space(), "called improperly");
3003 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
3004 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
3005 "Metaspace size is too big");
3006 assert_is_ptr_aligned(requested_addr, _reserve_alignment);
3007 assert_is_ptr_aligned(cds_base, _reserve_alignment);
3008 assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment);
3009
3010 // Don't use large pages for the class space.
3011 bool large_pages = false;
3012
3013 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
3014 _reserve_alignment,
3015 large_pages,
3016 requested_addr, 0);
3017 if (!metaspace_rs.is_reserved()) {
3018 if (UseSharedSpaces) {
3019 size_t increment = align_size_up(1*G, _reserve_alignment);
3020
3021 // Keep trying to allocate the metaspace, increasing the requested_addr
3022 // by 1GB each time, until we reach an address that will no longer allow
3023 // use of CDS with compressed klass pointers.
3024 char *addr = requested_addr;
3025 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
3026 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
3027 addr = addr + increment;
3028 metaspace_rs = ReservedSpace(compressed_class_space_size(),
3029 _reserve_alignment, large_pages, addr, 0);
3030 }
3031 }
3032
3033 // If no successful allocation then try to allocate the space anywhere. If
3034 // that fails then OOM doom. At this point we cannot try allocating the
3035 // metaspace as if UseCompressedClassPointers is off because too much
3036 // initialization has happened that depends on UseCompressedClassPointers.
3037 // So, UseCompressedClassPointers cannot be turned off at this point.
3038 if (!metaspace_rs.is_reserved()) {
3039 metaspace_rs = ReservedSpace(compressed_class_space_size(),
3040 _reserve_alignment, large_pages);
3041 if (!metaspace_rs.is_reserved()) {
3042 vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes",
3043 compressed_class_space_size()));
3044 }
3045 }
3046 }
3047
3048 // If we got here then the metaspace got allocated.
3049 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
3050
3051 // Verify that we can use shared spaces. Otherwise, turn off CDS.
3052 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
3053 FileMapInfo::stop_sharing_and_unmap(
3054 "Could not allocate metaspace at a compatible address");
3055 }
3056
3057 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
3058 UseSharedSpaces ? (address)cds_base : 0);
3059
3060 initialize_class_space(metaspace_rs);
3061
3062 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
3063 gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
3064 Universe::narrow_klass_base(), Universe::narrow_klass_shift());
3065 gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
3066 compressed_class_space_size(), metaspace_rs.base(), requested_addr);
3067 }
3068 }
3069
3070 // For UseCompressedClassPointers the class space is reserved above the top of
3071 // the Java heap. The argument passed in is at the base of the compressed space.
3072 void Metaspace::initialize_class_space(ReservedSpace rs) {
3073 // The reserved space size may be bigger because of alignment, esp with UseLargePages
3074 assert(rs.size() >= CompressedClassSpaceSize,
3075 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), CompressedClassSpaceSize));
3076 assert(using_class_space(), "Must be using class space");
3077 _class_space_list = new VirtualSpaceList(rs);
3078 _chunk_manager_class = new ChunkManager(SpecializedChunk, ClassSmallChunk, ClassMediumChunk);
3079
3080 if (!_class_space_list->initialization_succeeded()) {
3081 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
3082 }
3083 }
3084
3085 #endif
3086
3087 void Metaspace::ergo_initialize() {
3088 if (DumpSharedSpaces) {
3089 // Using large pages when dumping the shared archive is currently not implemented.
3090 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
3091 }
3092
3093 size_t page_size = os::vm_page_size();
3094 if (UseLargePages && UseLargePagesInMetaspace) {
3095 page_size = os::large_page_size();
3096 }
3097
3098 _commit_alignment = page_size;
3099 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
3100
3101 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
3102 // override if MaxMetaspaceSize was set on the command line or not.
3103 // This information is needed later to conform to the specification of the
3104 // java.lang.management.MemoryUsage API.
3105 //
3106 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
3107 // globals.hpp to the aligned value, but this is not possible, since the
3108 // alignment depends on other flags being parsed.
3109 MaxMetaspaceSize = align_size_down_bounded(MaxMetaspaceSize, _reserve_alignment);
3110
3111 if (MetaspaceSize > MaxMetaspaceSize) {
3112 MetaspaceSize = MaxMetaspaceSize;
3113 }
3114
3115 MetaspaceSize = align_size_down_bounded(MetaspaceSize, _commit_alignment);
3116
3117 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
3118
3119 if (MetaspaceSize < 256*K) {
3120 vm_exit_during_initialization("Too small initial Metaspace size");
3121 }
3122
3123 MinMetaspaceExpansion = align_size_down_bounded(MinMetaspaceExpansion, _commit_alignment);
3124 MaxMetaspaceExpansion = align_size_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
3125
3126 CompressedClassSpaceSize = align_size_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
3127 set_compressed_class_space_size(CompressedClassSpaceSize);
3128 }
3129
3130 void Metaspace::global_initialize() {
3131 MetaspaceGC::initialize();
3132
3133 // Initialize the alignment for shared spaces.
3134 int max_alignment = os::vm_allocation_granularity();
3135 size_t cds_total = 0;
3136
3137 MetaspaceShared::set_max_alignment(max_alignment);
3138
3139 if (DumpSharedSpaces) {
3140 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
3141 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
3142 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
3143 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
3144
3145 // Initialize with the sum of the shared space sizes. The read-only
3146 // and read write metaspace chunks will be allocated out of this and the
3147 // remainder is the misc code and data chunks.
3148 cds_total = FileMapInfo::shared_spaces_size();
3149 cds_total = align_size_up(cds_total, _reserve_alignment);
3150 _space_list = new VirtualSpaceList(cds_total/wordSize);
3151 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
3152
3153 if (!_space_list->initialization_succeeded()) {
3154 vm_exit_during_initialization("Unable to dump shared archive.", NULL);
3155 }
3156
3157 #ifdef _LP64
3158 if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) {
3159 vm_exit_during_initialization("Unable to dump shared archive.",
3160 err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space ("
3161 SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed "
3162 "klass limit: " SIZE_FORMAT, cds_total, compressed_class_space_size(),
3163 cds_total + compressed_class_space_size(), UnscaledClassSpaceMax));
3164 }
3165
3166 // Set the compressed klass pointer base so that decoding of these pointers works
3167 // properly when creating the shared archive.
3168 assert(UseCompressedOops && UseCompressedClassPointers,
3169 "UseCompressedOops and UseCompressedClassPointers must be set");
3170 Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom());
3171 if (TraceMetavirtualspaceAllocation && Verbose) {
3172 gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT,
3173 _space_list->current_virtual_space()->bottom());
3174 }
3175
3176 Universe::set_narrow_klass_shift(0);
3177 #endif
3178
3179 } else {
3180 // If using shared space, open the file that contains the shared space
3181 // and map in the memory before initializing the rest of metaspace (so
3182 // the addresses don't conflict)
3183 address cds_address = NULL;
3184 if (UseSharedSpaces) {
3185 FileMapInfo* mapinfo = new FileMapInfo();
3186 memset(mapinfo, 0, sizeof(FileMapInfo));
3187
3188 // Open the shared archive file, read and validate the header. If
3189 // initialization fails, shared spaces [UseSharedSpaces] are
3190 // disabled and the file is closed.
3191 // Map in spaces now also
3192 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
3193 FileMapInfo::set_current_info(mapinfo);
3194 cds_total = FileMapInfo::shared_spaces_size();
3195 cds_address = (address)mapinfo->region_base(0);
3196 } else {
3197 assert(!mapinfo->is_open() && !UseSharedSpaces,
3198 "archive file not closed or shared spaces not disabled.");
3199 }
3200 }
3201
3202 #ifdef _LP64
3203 // If UseCompressedClassPointers is set then allocate the metaspace area
3204 // above the heap and above the CDS area (if it exists).
3205 if (using_class_space()) {
3206 if (UseSharedSpaces) {
3207 char* cds_end = (char*)(cds_address + cds_total);
3208 cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
3209 allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
3210 } else {
3211 char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
3212 allocate_metaspace_compressed_klass_ptrs(base, 0);
3213 }
3214 }
3215 #endif
3216
3217 // Initialize these before initializing the VirtualSpaceList
3218 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
3219 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
3220 // Make the first class chunk bigger than a medium chunk so it's not put
3221 // on the medium chunk list. The next chunk will be small and progress
3222 // from there. This size calculated by -version.
3223 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
3224 (CompressedClassSpaceSize/BytesPerWord)*2);
3225 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
3226 // Arbitrarily set the initial virtual space to a multiple
3227 // of the boot class loader size.
3228 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
3229 word_size = align_size_up(word_size, Metaspace::reserve_alignment_words());
3230
3231 // Initialize the list of virtual spaces.
3232 _space_list = new VirtualSpaceList(word_size);
3233 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
3234
3235 if (!_space_list->initialization_succeeded()) {
3236 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
3237 }
3238 }
3239
3240 _tracer = new MetaspaceTracer();
3241 }
3242
3243 void Metaspace::post_initialize() {
3244 MetaspaceGC::post_initialize();
3245 }
3246
3247 Metachunk* Metaspace::get_initialization_chunk(MetadataType mdtype,
3248 size_t chunk_word_size,
3249 size_t chunk_bunch) {
3250 // Get a chunk from the chunk freelist
3251 Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
3252 if (chunk != NULL) {
3253 return chunk;
3254 }
3255
3256 return get_space_list(mdtype)->get_new_chunk(chunk_word_size, chunk_word_size, chunk_bunch);
3257 }
3258
3259 void Metaspace::initialize(Mutex* lock, MetaspaceType type) {
3260
3261 assert(space_list() != NULL,
3262 "Metadata VirtualSpaceList has not been initialized");
3263 assert(chunk_manager_metadata() != NULL,
3264 "Metadata ChunkManager has not been initialized");
3265
3266 _vsm = new SpaceManager(NonClassType, lock);
3267 if (_vsm == NULL) {
3268 return;
3269 }
3270 size_t word_size;
3271 size_t class_word_size;
3272 vsm()->get_initial_chunk_sizes(type, &word_size, &class_word_size);
3273
3274 if (using_class_space()) {
3275 assert(class_space_list() != NULL,
3276 "Class VirtualSpaceList has not been initialized");
3277 assert(chunk_manager_class() != NULL,
3278 "Class ChunkManager has not been initialized");
3279
3280 // Allocate SpaceManager for classes.
3281 _class_vsm = new SpaceManager(ClassType, lock);
3282 if (_class_vsm == NULL) {
3283 return;
3284 }
3285 }
3286
3287 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3288
3289 // Allocate chunk for metadata objects
3290 Metachunk* new_chunk = get_initialization_chunk(NonClassType,
3291 word_size,
3292 vsm()->medium_chunk_bunch());
3293 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
3294 if (new_chunk != NULL) {
3295 // Add to this manager's list of chunks in use and current_chunk().
3296 vsm()->add_chunk(new_chunk, true);
3297 }
3298
3299 // Allocate chunk for class metadata objects
3300 if (using_class_space()) {
3301 Metachunk* class_chunk = get_initialization_chunk(ClassType,
3302 class_word_size,
3303 class_vsm()->medium_chunk_bunch());
3304 if (class_chunk != NULL) {
3305 class_vsm()->add_chunk(class_chunk, true);
3306 }
3307 }
3308
3309 _alloc_record_head = NULL;
3310 _alloc_record_tail = NULL;
3311 }
3312
3313 size_t Metaspace::align_word_size_up(size_t word_size) {
3314 size_t byte_size = word_size * wordSize;
3315 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
3316 }
3317
3318 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
3319 // DumpSharedSpaces doesn't use class metadata area (yet)
3320 // Also, don't use class_vsm() unless UseCompressedClassPointers is true.
3321 if (is_class_space_allocation(mdtype)) {
3322 return class_vsm()->allocate(word_size);
3323 } else {
3324 return vsm()->allocate(word_size);
3325 }
3326 }
3327
3328 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
3329 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
3330 assert(delta_bytes > 0, "Must be");
3331
3332 size_t after_inc = MetaspaceGC::inc_capacity_until_GC(delta_bytes);
3333
3334 // capacity_until_GC might be updated concurrently, must calculate previous value.
3335 size_t before_inc = after_inc - delta_bytes;
3336
3337 tracer()->report_gc_threshold(before_inc, after_inc,
3338 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
3339 if (PrintGCDetails && Verbose) {
3340 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
3341 " to " SIZE_FORMAT, before_inc, after_inc);
3342 }
3343
3344 return allocate(word_size, mdtype);
3345 }
3346
3347 // Space allocated in the Metaspace. This may
3348 // be across several metadata virtual spaces.
3349 char* Metaspace::bottom() const {
3350 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
3351 return (char*)vsm()->current_chunk()->bottom();
3352 }
3353
3354 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
3355 if (mdtype == ClassType) {
3356 return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0;
3357 } else {
3358 return vsm()->sum_used_in_chunks_in_use(); // includes overhead!
3359 }
3360 }
3361
3362 size_t Metaspace::free_words_slow(MetadataType mdtype) const {
3363 if (mdtype == ClassType) {
3364 return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0;
3365 } else {
3366 return vsm()->sum_free_in_chunks_in_use();
3367 }
3368 }
3369
3370 // Space capacity in the Metaspace. It includes
3371 // space in the list of chunks from which allocations
3372 // have been made. Don't include space in the global freelist and
3373 // in the space available in the dictionary which
3374 // is already counted in some chunk.
3375 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
3376 if (mdtype == ClassType) {
3377 return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0;
3378 } else {
3379 return vsm()->sum_capacity_in_chunks_in_use();
3380 }
3381 }
3382
3383 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
3384 return used_words_slow(mdtype) * BytesPerWord;
3385 }
3386
3387 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
3388 return capacity_words_slow(mdtype) * BytesPerWord;
3389 }
3390
3391 size_t Metaspace::allocated_blocks_bytes() const {
3392 return vsm()->allocated_blocks_bytes() +
3393 (using_class_space() ? class_vsm()->allocated_blocks_bytes() : 0);
3394 }
3395
3396 size_t Metaspace::allocated_chunks_bytes() const {
3397 return vsm()->allocated_chunks_bytes() +
3398 (using_class_space() ? class_vsm()->allocated_chunks_bytes() : 0);
3399 }
3400
3401 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
3402 assert(!SafepointSynchronize::is_at_safepoint()
3403 || Thread::current()->is_VM_thread(), "should be the VM thread");
3404
3405 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
3406
3407 if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
3408 // Dark matter. Too small for dictionary.
3409 #ifdef ASSERT
3410 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
3411 #endif
3412 return;
3413 }
3414 if (is_class && using_class_space()) {
3415 class_vsm()->deallocate(ptr, word_size);
3416 } else {
3417 vsm()->deallocate(ptr, word_size);
3418 }
3419 }
3420
3421
3422 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
3423 bool read_only, MetaspaceObj::Type type, TRAPS) {
3424 if (HAS_PENDING_EXCEPTION) {
3425 assert(false, "Should not allocate with exception pending");
3426 return NULL; // caller does a CHECK_NULL too
3427 }
3428
3429 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
3430 "ClassLoaderData::the_null_class_loader_data() should have been used.");
3431
3432 // Allocate in metaspaces without taking out a lock, because it deadlocks
3433 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
3434 // to revisit this for application class data sharing.
3435 if (DumpSharedSpaces) {
3436 assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity");
3437 Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace();
3438 MetaWord* result = space->allocate(word_size, NonClassType);
3439 if (result == NULL) {
3440 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
3441 }
3442
3443 space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
3444
3445 // Zero initialize.
3446 Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
3447
3448 return result;
3449 }
3450
3451 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
3452
3453 // Try to allocate metadata.
3454 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
3455
3456 if (result == NULL) {
3457 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
3458
3459 // Allocation failed.
3460 if (is_init_completed()) {
3461 // Only start a GC if the bootstrapping has completed.
3462
3463 // Try to clean out some memory and retry.
3464 result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
3465 loader_data, word_size, mdtype);
3466 }
3467 }
3468
3469 if (result == NULL) {
3470 report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL);
3471 }
3472
3473 // Zero initialize.
3474 Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
3475
3476 return result;
3477 }
3478
3479 size_t Metaspace::class_chunk_size(size_t word_size) {
3480 assert(using_class_space(), "Has to use class space");
3481 return class_vsm()->calc_chunk_size(word_size);
3482 }
3483
3484 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
3485 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
3486
3487 // If result is still null, we are out of memory.
3488 if (Verbose && TraceMetadataChunkAllocation) {
3489 gclog_or_tty->print_cr("Metaspace allocation failed for size "
3490 SIZE_FORMAT, word_size);
3491 if (loader_data->metaspace_or_null() != NULL) {
3492 loader_data->dump(gclog_or_tty);
3493 }
3494 MetaspaceAux::dump(gclog_or_tty);
3495 }
3496
3497 bool out_of_compressed_class_space = false;
3498 if (is_class_space_allocation(mdtype)) {
3499 Metaspace* metaspace = loader_data->metaspace_non_null();
3500 out_of_compressed_class_space =
3501 MetaspaceAux::committed_bytes(Metaspace::ClassType) +
3502 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
3503 CompressedClassSpaceSize;
3504 }
3505
3506 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
3507 const char* space_string = out_of_compressed_class_space ?
3508 "Compressed class space" : "Metaspace";
3509
3510 report_java_out_of_memory(space_string);
3511
3512 if (JvmtiExport::should_post_resource_exhausted()) {
3513 JvmtiExport::post_resource_exhausted(
3514 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
3515 space_string);
3516 }
3517
3518 if (!is_init_completed()) {
3519 vm_exit_during_initialization("OutOfMemoryError", space_string);
3520 }
3521
3522 if (out_of_compressed_class_space) {
3523 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
3524 } else {
3525 THROW_OOP(Universe::out_of_memory_error_metaspace());
3526 }
3527 }
3528
3529 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
3530 switch (mdtype) {
3531 case Metaspace::ClassType: return "Class";
3532 case Metaspace::NonClassType: return "Metadata";
3533 default:
3534 assert(false, err_msg("Got bad mdtype: %d", (int) mdtype));
3535 return NULL;
3536 }
3537 }
3538
3539 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
3540 assert(DumpSharedSpaces, "sanity");
3541
3542 AllocRecord *rec = new AllocRecord((address)ptr, type, (int)word_size * HeapWordSize);
3543 if (_alloc_record_head == NULL) {
3544 _alloc_record_head = _alloc_record_tail = rec;
3545 } else {
3546 _alloc_record_tail->_next = rec;
3547 _alloc_record_tail = rec;
3548 }
3549 }
3550
3551 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
3552 assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
3553
3554 address last_addr = (address)bottom();
3555
3556 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
3557 address ptr = rec->_ptr;
3558 if (last_addr < ptr) {
3559 closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr);
3560 }
3561 closure->doit(ptr, rec->_type, rec->_byte_size);
3562 last_addr = ptr + rec->_byte_size;
3563 }
3564
3565 address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType);
3566 if (last_addr < top) {
3567 closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr);
3568 }
3569 }
3570
3571 void Metaspace::purge(MetadataType mdtype) {
3572 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
3573 }
3574
3575 void Metaspace::purge() {
3576 MutexLockerEx cl(SpaceManager::expand_lock(),
3577 Mutex::_no_safepoint_check_flag);
3578 purge(NonClassType);
3579 if (using_class_space()) {
3580 purge(ClassType);
3581 }
3582 }
3583
3584 void Metaspace::print_on(outputStream* out) const {
3585 // Print both class virtual space counts and metaspace.
3586 if (Verbose) {
3587 vsm()->print_on(out);
3588 if (using_class_space()) {
3589 class_vsm()->print_on(out);
3590 }
3591 }
3592 }
3593
3594 bool Metaspace::contains(const void* ptr) {
3595 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(ptr)) {
3596 return true;
3597 }
3598
3599 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
3600 return true;
3601 }
3602
3603 return get_space_list(NonClassType)->contains(ptr);
3604 }
3605
3606 void Metaspace::verify() {
3607 vsm()->verify();
3608 if (using_class_space()) {
3609 class_vsm()->verify();
3610 }
3611 }
3612
3613 void Metaspace::dump(outputStream* const out) const {
3614 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
3615 vsm()->dump(out);
3616 if (using_class_space()) {
3617 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
3618 class_vsm()->dump(out);
3619 }
3620 }
3621
3622 /////////////// Unit tests ///////////////
3623
3624 #ifndef PRODUCT
3625
3626 class TestMetaspaceAuxTest : AllStatic {
3627 public:
3628 static void test_reserved() {
3629 size_t reserved = MetaspaceAux::reserved_bytes();
3630
3631 assert(reserved > 0, "assert");
3632
3633 size_t committed = MetaspaceAux::committed_bytes();
3634 assert(committed <= reserved, "assert");
3635
3636 size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType);
3637 assert(reserved_metadata > 0, "assert");
3638 assert(reserved_metadata <= reserved, "assert");
3639
3640 if (UseCompressedClassPointers) {
3641 size_t reserved_class = MetaspaceAux::reserved_bytes(Metaspace::ClassType);
3642 assert(reserved_class > 0, "assert");
3643 assert(reserved_class < reserved, "assert");
3644 }
3645 }
3646
3647 static void test_committed() {
3648 size_t committed = MetaspaceAux::committed_bytes();
3649
3650 assert(committed > 0, "assert");
3651
3652 size_t reserved = MetaspaceAux::reserved_bytes();
3653 assert(committed <= reserved, "assert");
3654
3655 size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType);
3656 assert(committed_metadata > 0, "assert");
3657 assert(committed_metadata <= committed, "assert");
3658
3659 if (UseCompressedClassPointers) {
3660 size_t committed_class = MetaspaceAux::committed_bytes(Metaspace::ClassType);
3661 assert(committed_class > 0, "assert");
3662 assert(committed_class < committed, "assert");
3663 }
3664 }
3665
3666 static void test_virtual_space_list_large_chunk() {
3667 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
3668 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3669 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
3670 // vm_allocation_granularity aligned on Windows.
3671 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
3672 large_size += (os::vm_page_size()/BytesPerWord);
3673 vs_list->get_new_chunk(large_size, large_size, 0);
3674 }
3675
3676 static void test() {
3677 test_reserved();
3678 test_committed();
3679 test_virtual_space_list_large_chunk();
3680 }
3681 };
3682
3683 void TestMetaspaceAux_test() {
3684 TestMetaspaceAuxTest::test();
3685 }
3686
3687 class TestVirtualSpaceNodeTest {
3688 static void chunk_up(size_t words_left, size_t& num_medium_chunks,
3689 size_t& num_small_chunks,
3690 size_t& num_specialized_chunks) {
3691 num_medium_chunks = words_left / MediumChunk;
3692 words_left = words_left % MediumChunk;
3693
3694 num_small_chunks = words_left / SmallChunk;
3695 words_left = words_left % SmallChunk;
3696 // how many specialized chunks can we get?
3697 num_specialized_chunks = words_left / SpecializedChunk;
3698 assert(words_left % SpecializedChunk == 0, "should be nothing left");
3699 }
3700
3701 public:
3702 static void test() {
3703 MutexLockerEx ml(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3704 const size_t vsn_test_size_words = MediumChunk * 4;
3705 const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
3706
3707 // The chunk sizes must be multiples of eachother, or this will fail
3708 STATIC_ASSERT(MediumChunk % SmallChunk == 0);
3709 STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
3710
3711 { // No committed memory in VSN
3712 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3713 VirtualSpaceNode vsn(vsn_test_size_bytes);
3714 vsn.initialize();
3715 vsn.retire(&cm);
3716 assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
3717 }
3718
3719 { // All of VSN is committed, half is used by chunks
3720 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3721 VirtualSpaceNode vsn(vsn_test_size_bytes);
3722 vsn.initialize();
3723 vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
3724 vsn.get_chunk_vs(MediumChunk);
3725 vsn.get_chunk_vs(MediumChunk);
3726 vsn.retire(&cm);
3727 assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
3728 assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
3729 }
3730
3731 { // 4 pages of VSN is committed, some is used by chunks
3732 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3733 VirtualSpaceNode vsn(vsn_test_size_bytes);
3734 const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
3735 assert(page_chunks < MediumChunk, "Test expects medium chunks to be at least 4*page_size");
3736 vsn.initialize();
3737 vsn.expand_by(page_chunks, page_chunks);
3738 vsn.get_chunk_vs(SmallChunk);
3739 vsn.get_chunk_vs(SpecializedChunk);
3740 vsn.retire(&cm);
3741
3742 // committed - used = words left to retire
3743 const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
3744
3745 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
3746 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
3747
3748 assert(num_medium_chunks == 0, "should not get any medium chunks");
3749 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
3750 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
3751 }
3752
3753 { // Half of VSN is committed, a humongous chunk is used
3754 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3755 VirtualSpaceNode vsn(vsn_test_size_bytes);
3756 vsn.initialize();
3757 vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
3758 vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
3759 vsn.retire(&cm);
3760
3761 const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
3762 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
3763 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
3764
3765 assert(num_medium_chunks == 0, "should not get any medium chunks");
3766 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
3767 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
3768 }
3769
3770 }
3771
3772 #define assert_is_available_positive(word_size) \
3773 assert(vsn.is_available(word_size), \
3774 err_msg(#word_size ": " PTR_FORMAT " bytes were not available in " \
3775 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
3776 (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
3777
3778 #define assert_is_available_negative(word_size) \
3779 assert(!vsn.is_available(word_size), \
3780 err_msg(#word_size ": " PTR_FORMAT " bytes should not be available in " \
3781 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
3782 (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
3783
3784 static void test_is_available_positive() {
3785 // Reserve some memory.
3786 VirtualSpaceNode vsn(os::vm_allocation_granularity());
3787 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
3788
3789 // Commit some memory.
3790 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
3791 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
3792 assert(expanded, "Failed to commit");
3793
3794 // Check that is_available accepts the committed size.
3795 assert_is_available_positive(commit_word_size);
3796
3797 // Check that is_available accepts half the committed size.
3798 size_t expand_word_size = commit_word_size / 2;
3799 assert_is_available_positive(expand_word_size);
3800 }
3801
3802 static void test_is_available_negative() {
3803 // Reserve some memory.
3804 VirtualSpaceNode vsn(os::vm_allocation_granularity());
3805 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
3806
3807 // Commit some memory.
3808 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
3809 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
3810 assert(expanded, "Failed to commit");
3811
3812 // Check that is_available doesn't accept a too large size.
3813 size_t two_times_commit_word_size = commit_word_size * 2;
3814 assert_is_available_negative(two_times_commit_word_size);
3815 }
3816
3817 static void test_is_available_overflow() {
3818 // Reserve some memory.
3819 VirtualSpaceNode vsn(os::vm_allocation_granularity());
3820 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
3821
3822 // Commit some memory.
3823 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
3824 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
3825 assert(expanded, "Failed to commit");
3826
3827 // Calculate a size that will overflow the virtual space size.
3828 void* virtual_space_max = (void*)(uintptr_t)-1;
3829 size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
3830 size_t overflow_size = bottom_to_max + BytesPerWord;
3831 size_t overflow_word_size = overflow_size / BytesPerWord;
3832
3833 // Check that is_available can handle the overflow.
3834 assert_is_available_negative(overflow_word_size);
3835 }
3836
3837 static void test_is_available() {
3838 TestVirtualSpaceNodeTest::test_is_available_positive();
3839 TestVirtualSpaceNodeTest::test_is_available_negative();
3840 TestVirtualSpaceNodeTest::test_is_available_overflow();
3841 }
3842 };
3843
3844 void TestVirtualSpaceNode_test() {
3845 TestVirtualSpaceNodeTest::test();
3846 TestVirtualSpaceNodeTest::test_is_available();
3847 }
3848 #endif