annotate src/share/vm/memory/metaspace.cpp @ 4497:df254344edf1

8011173: NPG: Replace the ChunkList implementation with class FreeList<Metachunk> Reviewed-by: mgerdin, tschatzl, johnc, coleenp
author jmasa
date Mon, 01 Apr 2013 10:50:30 -0700
parents 6574f999e0cf
children c23dbf0e8ab7
rev   line source
coleenp@3602 1 /*
coleenp@4277 2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
coleenp@3602 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@3602 4 *
coleenp@3602 5 * This code is free software; you can redistribute it and/or modify it
coleenp@3602 6 * under the terms of the GNU General Public License version 2 only, as
coleenp@3602 7 * published by the Free Software Foundation.
coleenp@3602 8 *
coleenp@3602 9 * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@3602 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@3602 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
coleenp@3602 12 * version 2 for more details (a copy is included in the LICENSE file that
coleenp@3602 13 * accompanied this code).
coleenp@3602 14 *
coleenp@3602 15 * You should have received a copy of the GNU General Public License version
coleenp@3602 16 * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@3602 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@3602 18 *
coleenp@3602 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@3602 20 * or visit www.oracle.com if you need additional information or have any
coleenp@3602 21 * questions.
coleenp@3602 22 *
coleenp@3602 23 */
coleenp@3602 24 #include "precompiled.hpp"
coleenp@3602 25 #include "gc_interface/collectedHeap.hpp"
coleenp@3602 26 #include "memory/binaryTreeDictionary.hpp"
jmasa@3761 27 #include "memory/freeList.hpp"
coleenp@3602 28 #include "memory/collectorPolicy.hpp"
coleenp@3602 29 #include "memory/filemap.hpp"
coleenp@3602 30 #include "memory/freeList.hpp"
jmasa@3761 31 #include "memory/metablock.hpp"
jmasa@3761 32 #include "memory/metachunk.hpp"
coleenp@3602 33 #include "memory/metaspace.hpp"
coleenp@3602 34 #include "memory/metaspaceShared.hpp"
coleenp@3602 35 #include "memory/resourceArea.hpp"
coleenp@3602 36 #include "memory/universe.hpp"
coleenp@3602 37 #include "runtime/globals.hpp"
coleenp@3602 38 #include "runtime/mutex.hpp"
coleenp@3860 39 #include "runtime/orderAccess.hpp"
coleenp@3602 40 #include "services/memTracker.hpp"
coleenp@3602 41 #include "utilities/copy.hpp"
coleenp@3602 42 #include "utilities/debug.hpp"
coleenp@3602 43
jmasa@3761 44 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
jmasa@3761 45 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
mgerdin@3829 46 // Define this macro to enable slow integrity checking of
mgerdin@3829 47 // the free chunk lists
mgerdin@3829 48 const bool metaspace_slow_verify = false;
mgerdin@3829 49
coleenp@3602 50
coleenp@3602 51 // Parameters for stress mode testing
coleenp@3602 52 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 53 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 54 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 55
coleenp@3602 56 MetaWord* last_allocated = 0;
coleenp@3602 57
coleenp@3602 58 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 59 enum ChunkIndex {
jmasa@3947 60 ZeroIndex = 0,
jmasa@3947 61 SpecializedIndex = ZeroIndex,
jmasa@3947 62 SmallIndex = SpecializedIndex + 1,
jmasa@3947 63 MediumIndex = SmallIndex + 1,
jmasa@3947 64 HumongousIndex = MediumIndex + 1,
jmasa@3947 65 NumberOfFreeLists = 3,
jmasa@3947 66 NumberOfInUseLists = 4
jmasa@3947 67 };
jmasa@3947 68
jmasa@3947 69 enum ChunkSizes { // in words.
jmasa@3947 70 ClassSpecializedChunk = 128,
jmasa@3947 71 SpecializedChunk = 128,
jmasa@3947 72 ClassSmallChunk = 256,
jmasa@3947 73 SmallChunk = 512,
jmasa@3947 74 ClassMediumChunk = 1 * K,
jmasa@3947 75 MediumChunk = 8 * K,
jmasa@3947 76 HumongousChunkGranularity = 8
coleenp@3602 77 };
coleenp@3602 78
coleenp@3602 79 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 80 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 81 return (ChunkIndex) (i+1);
coleenp@3602 82 }
coleenp@3602 83
coleenp@3602 84 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 85 // the default MetaspaceSize before argument processing was being
coleenp@3602 86 // used which was not the desired value. See the code
coleenp@3602 87 // in should_expand() to see how the initialization is handled
coleenp@3602 88 // now.
coleenp@3602 89 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 90 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 91 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 92 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 93
coleenp@3602 94 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 95 //
coleenp@3602 96 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 97 // allocated there is no explicit link between a Metachunk and
coleenp@3602 98 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 99 //
coleenp@3602 100 // Each SpaceManager maintains a
coleenp@3602 101 // list of the chunks it is using and the current chunk. The current
coleenp@3602 102 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 103 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 104 // reused from there.
coleenp@3602 105
jmasa@4497 106 typedef class FreeList<Metachunk> ChunkList;
coleenp@3602 107
coleenp@3602 108 // Manages the global free lists of chunks.
coleenp@3602 109 // Has three lists of free chunks, and a total size and
coleenp@3602 110 // count that includes all three
coleenp@3602 111
coleenp@3602 112 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 113
coleenp@3602 114 // Free list of chunks of different sizes.
coleenp@3602 115 // SmallChunk
coleenp@3602 116 // MediumChunk
coleenp@3602 117 // HumongousChunk
jmasa@3761 118 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 119
jmasa@3947 120
jmasa@3761 121 // HumongousChunk
jmasa@3761 122 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 123
coleenp@3602 124 // ChunkManager in all lists of this type
coleenp@3602 125 size_t _free_chunks_total;
coleenp@3602 126 size_t _free_chunks_count;
coleenp@3602 127
coleenp@3602 128 void dec_free_chunks_total(size_t v) {
coleenp@3602 129 assert(_free_chunks_count > 0 &&
coleenp@3602 130 _free_chunks_total > 0,
coleenp@3602 131 "About to go negative");
coleenp@3602 132 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 133 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 134 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 135 }
coleenp@3602 136
coleenp@3602 137 // Debug support
coleenp@3602 138
coleenp@3602 139 size_t sum_free_chunks();
coleenp@3602 140 size_t sum_free_chunks_count();
coleenp@3602 141
coleenp@3602 142 void locked_verify_free_chunks_total();
mgerdin@3829 143 void slow_locked_verify_free_chunks_total() {
mgerdin@3829 144 if (metaspace_slow_verify) {
mgerdin@3829 145 locked_verify_free_chunks_total();
mgerdin@3829 146 }
mgerdin@3829 147 }
coleenp@3602 148 void locked_verify_free_chunks_count();
mgerdin@3829 149 void slow_locked_verify_free_chunks_count() {
mgerdin@3829 150 if (metaspace_slow_verify) {
mgerdin@3829 151 locked_verify_free_chunks_count();
mgerdin@3829 152 }
mgerdin@3829 153 }
coleenp@3602 154 void verify_free_chunks_count();
coleenp@3602 155
coleenp@3602 156 public:
coleenp@3602 157
coleenp@3602 158 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 159
coleenp@3602 160 // add or delete (return) a chunk to the global freelist.
coleenp@3602 161 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 162 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 163
jmasa@3947 164 // Map a size to a list index assuming that there are lists
jmasa@3947 165 // for special, small, medium, and humongous chunks.
jmasa@3947 166 static ChunkIndex list_index(size_t size);
jmasa@3947 167
jmasa@4497 168 // Add the simple linked list of chunks to the freelist of chunks
jmasa@4497 169 // of type index.
jmasa@4497 170 void return_chunks(ChunkIndex index, Metachunk* chunks);
jmasa@4497 171
coleenp@3602 172 // Total of the space in the free chunks list
coleenp@3602 173 size_t free_chunks_total();
coleenp@3602 174 size_t free_chunks_total_in_bytes();
coleenp@3602 175
coleenp@3602 176 // Number of chunks in the free chunks list
coleenp@3602 177 size_t free_chunks_count();
coleenp@3602 178
coleenp@3602 179 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 180 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 181 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 182 }
jmasa@3761 183 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 184 return &_humongous_dictionary;
jmasa@3761 185 }
coleenp@3602 186
coleenp@3602 187 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 188
coleenp@3602 189 // Returns the list for the given chunk word size.
coleenp@3602 190 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 191
coleenp@3602 192 // Add and remove from a list by size. Selects
coleenp@3602 193 // list based on size of chunk.
coleenp@3602 194 void free_chunks_put(Metachunk* chuck);
coleenp@3602 195 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 196
coleenp@3602 197 // Debug support
coleenp@3602 198 void verify();
mgerdin@3829 199 void slow_verify() {
mgerdin@3829 200 if (metaspace_slow_verify) {
mgerdin@3829 201 verify();
mgerdin@3829 202 }
mgerdin@3829 203 }
coleenp@3602 204 void locked_verify();
mgerdin@3829 205 void slow_locked_verify() {
mgerdin@3829 206 if (metaspace_slow_verify) {
mgerdin@3829 207 locked_verify();
mgerdin@3829 208 }
mgerdin@3829 209 }
coleenp@3602 210 void verify_free_chunks_total();
coleenp@3602 211
coleenp@3602 212 void locked_print_free_chunks(outputStream* st);
coleenp@3602 213 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 214
jmasa@3761 215 void print_on(outputStream* st);
coleenp@3602 216 };
coleenp@3602 217
coleenp@3602 218
coleenp@3602 219 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 220 // to the allocation of a quantum of metadata).
coleenp@3602 221 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 222 BlockTreeDictionary* _dictionary;
jmasa@3761 223 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 224
coleenp@3602 225 // Accessors
jmasa@3761 226 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 227
coleenp@3602 228 public:
coleenp@3602 229 BlockFreelist();
coleenp@3602 230 ~BlockFreelist();
coleenp@3602 231
coleenp@3602 232 // Get and return a block to the free list
jmasa@3761 233 MetaWord* get_block(size_t word_size);
jmasa@3761 234 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 235
jmasa@3761 236 size_t total_size() {
jmasa@3761 237 if (dictionary() == NULL) {
coleenp@3602 238 return 0;
jmasa@3761 239 } else {
jmasa@3761 240 return dictionary()->total_size();
coleenp@3602 241 }
jmasa@3761 242 }
coleenp@3602 243
coleenp@3602 244 void print_on(outputStream* st) const;
coleenp@3602 245 };
coleenp@3602 246
coleenp@3602 247 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 248 friend class VirtualSpaceList;
coleenp@3602 249
coleenp@3602 250 // Link to next VirtualSpaceNode
coleenp@3602 251 VirtualSpaceNode* _next;
coleenp@3602 252
coleenp@3602 253 // total in the VirtualSpace
coleenp@3602 254 MemRegion _reserved;
coleenp@3602 255 ReservedSpace _rs;
coleenp@3602 256 VirtualSpace _virtual_space;
coleenp@3602 257 MetaWord* _top;
coleenp@3602 258
coleenp@3602 259 // Convenience functions for logical bottom and end
coleenp@3602 260 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 261 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 262
coleenp@3602 263 // Convenience functions to access the _virtual_space
coleenp@3602 264 char* low() const { return virtual_space()->low(); }
coleenp@3602 265 char* high() const { return virtual_space()->high(); }
coleenp@3602 266
coleenp@3602 267 public:
coleenp@3602 268
coleenp@3602 269 VirtualSpaceNode(size_t byte_size);
coleenp@3602 270 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {}
coleenp@3602 271 ~VirtualSpaceNode();
coleenp@3602 272
coleenp@3602 273 // address of next available space in _virtual_space;
coleenp@3602 274 // Accessors
coleenp@3602 275 VirtualSpaceNode* next() { return _next; }
coleenp@3602 276 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 277
coleenp@3602 278 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 279 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 280
coleenp@3602 281 // Accessors
coleenp@3602 282 MemRegion* reserved() { return &_reserved; }
coleenp@3602 283 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 284
coleenp@3602 285 // Returns true if "word_size" is available in the virtual space
coleenp@3602 286 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 287
coleenp@3602 288 MetaWord* top() const { return _top; }
coleenp@3602 289 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 290
coleenp@3602 291 // used and capacity in this single entry in the list
coleenp@3602 292 size_t used_words_in_vs() const;
coleenp@3602 293 size_t capacity_words_in_vs() const;
coleenp@3602 294
coleenp@3602 295 bool initialize();
coleenp@3602 296
coleenp@3602 297 // get space from the virtual space
coleenp@3602 298 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 299
coleenp@3602 300 // Allocate a chunk from the virtual space and return it.
coleenp@3602 301 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 302 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 303
coleenp@3602 304 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 305 // to Virtualspace
coleenp@3602 306 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 307 bool shrink_by(size_t words);
coleenp@3602 308
coleenp@3869 309 #ifdef ASSERT
coleenp@3602 310 // Debug support
coleenp@3602 311 static void verify_virtual_space_total();
coleenp@3602 312 static void verify_virtual_space_count();
coleenp@3602 313 void mangle();
coleenp@3869 314 #endif
coleenp@3602 315
coleenp@3602 316 void print_on(outputStream* st) const;
coleenp@3602 317 };
coleenp@3602 318
coleenp@3602 319 // byte_size is the size of the associated virtualspace.
coleenp@3602 320 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) {
zgu@4317 321 // align up to vm allocation granularity
zgu@4317 322 byte_size = align_size_up(byte_size, os::vm_allocation_granularity());
zgu@4317 323
coleenp@4369 324 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
coleenp@4369 325 // configurable address, generally at the top of the Java heap so other
coleenp@4369 326 // memory addresses don't conflict.
coleenp@3602 327 if (DumpSharedSpaces) {
coleenp@4369 328 char* shared_base = (char*)SharedBaseAddress;
coleenp@3602 329 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 330 if (_rs.is_reserved()) {
coleenp@4369 331 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
coleenp@3602 332 } else {
coleenp@4369 333 // Get a mmap region anywhere if the SharedBaseAddress fails.
coleenp@3602 334 _rs = ReservedSpace(byte_size);
coleenp@3602 335 }
coleenp@3602 336 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 337 } else {
coleenp@3602 338 _rs = ReservedSpace(byte_size);
coleenp@3602 339 }
coleenp@3602 340
coleenp@3602 341 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 342 }
coleenp@3602 343
coleenp@3602 344 // List of VirtualSpaces for metadata allocation.
coleenp@3602 345 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 346 // for total space in the VirtualSpace.
coleenp@3602 347 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 348 friend class VirtualSpaceNode;
coleenp@3602 349
coleenp@3602 350 enum VirtualSpaceSizes {
coleenp@3602 351 VirtualSpaceSize = 256 * K
coleenp@3602 352 };
coleenp@3602 353
coleenp@3602 354 // Global list of virtual spaces
coleenp@3602 355 // Head of the list
coleenp@3602 356 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 357 // virtual space currently being used for allocations
coleenp@3602 358 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 359 // Free chunk list for all other metadata
coleenp@3602 360 ChunkManager _chunk_manager;
coleenp@3602 361
coleenp@3602 362 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 363 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 364 bool _is_class;
coleenp@3602 365 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 366
coleenp@3602 367 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 368 size_t _virtual_space_total;
coleenp@3602 369 size_t _virtual_space_count;
coleenp@3602 370
coleenp@3602 371 ~VirtualSpaceList();
coleenp@3602 372
coleenp@3602 373 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 374
coleenp@3602 375 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 376 _virtual_space_list = v;
coleenp@3602 377 }
coleenp@3602 378 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 379 _current_virtual_space = v;
coleenp@3602 380 }
coleenp@3602 381
coleenp@3602 382 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 383
coleenp@3602 384 // Get another virtual space and add it to the list. This
coleenp@3602 385 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 386 // and is typically followed by the allocation of a chunk.
coleenp@3602 387 bool grow_vs(size_t vs_word_size);
coleenp@3602 388
coleenp@3602 389 public:
coleenp@3602 390 VirtualSpaceList(size_t word_size);
coleenp@3602 391 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 392
jmasa@3947 393 Metachunk* get_new_chunk(size_t word_size,
jmasa@3947 394 size_t grow_chunks_by_words,
jmasa@3947 395 size_t medium_chunk_bunch);
jmasa@3947 396
jmasa@3947 397 // Get the first chunk for a Metaspace. Used for
jmasa@3947 398 // special cases such as the boot class loader, reflection
jmasa@3947 399 // class loader and anonymous class loader.
jmasa@3947 400 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch);
coleenp@3602 401
coleenp@3602 402 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 403 return _current_virtual_space;
coleenp@3602 404 }
coleenp@3602 405
coleenp@3602 406 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 407 bool is_class() const { return _is_class; }
coleenp@3602 408
coleenp@3602 409 // Allocate the first virtualspace.
coleenp@3602 410 void initialize(size_t word_size);
coleenp@3602 411
coleenp@3602 412 size_t virtual_space_total() { return _virtual_space_total; }
coleenp@3602 413 void inc_virtual_space_total(size_t v) {
coleenp@3602 414 Atomic::add_ptr(v, &_virtual_space_total);
coleenp@3602 415 }
coleenp@3602 416
coleenp@3602 417 size_t virtual_space_count() { return _virtual_space_count; }
coleenp@3602 418 void inc_virtual_space_count() {
coleenp@3602 419 Atomic::inc_ptr(&_virtual_space_count);
coleenp@3602 420 }
coleenp@3602 421
coleenp@3602 422 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 423 // These are global values shared by all Metaspaces
coleenp@3602 424 size_t capacity_words_sum();
coleenp@3602 425 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 426 size_t used_words_sum();
coleenp@3602 427 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 428
coleenp@3602 429 bool contains(const void *ptr);
coleenp@3602 430
coleenp@3602 431 void print_on(outputStream* st) const;
coleenp@3602 432
coleenp@3602 433 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 434 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 435 public:
coleenp@3602 436 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 437 _virtual_spaces(virtual_spaces) {}
coleenp@3602 438
coleenp@3602 439 bool repeat() {
coleenp@3602 440 return _virtual_spaces != NULL;
coleenp@3602 441 }
coleenp@3602 442
coleenp@3602 443 VirtualSpaceNode* get_next() {
coleenp@3602 444 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 445 if (_virtual_spaces != NULL) {
coleenp@3602 446 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 447 }
coleenp@3602 448 return result;
coleenp@3602 449 }
coleenp@3602 450 };
coleenp@3602 451 };
coleenp@3602 452
coleenp@3602 453 class Metadebug : AllStatic {
coleenp@3602 454 // Debugging support for Metaspaces
coleenp@3602 455 static int _deallocate_block_a_lot_count;
coleenp@3602 456 static int _deallocate_chunk_a_lot_count;
coleenp@3602 457 static int _allocation_fail_alot_count;
coleenp@3602 458
coleenp@3602 459 public:
coleenp@3602 460 static int deallocate_block_a_lot_count() {
coleenp@3602 461 return _deallocate_block_a_lot_count;
coleenp@3602 462 }
coleenp@3602 463 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 464 _deallocate_block_a_lot_count = v;
coleenp@3602 465 }
coleenp@3602 466 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 467 _deallocate_block_a_lot_count++;
coleenp@3602 468 }
coleenp@3602 469 static int deallocate_chunk_a_lot_count() {
coleenp@3602 470 return _deallocate_chunk_a_lot_count;
coleenp@3602 471 }
coleenp@3602 472 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 473 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 474 }
coleenp@3602 475 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 476 _deallocate_chunk_a_lot_count++;
coleenp@3602 477 }
coleenp@3602 478
coleenp@3602 479 static void init_allocation_fail_alot_count();
coleenp@3602 480 #ifdef ASSERT
coleenp@3602 481 static bool test_metadata_failure();
coleenp@3602 482 #endif
coleenp@3602 483
coleenp@3602 484 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 485 size_t chunk_word_size);
coleenp@3602 486 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 487 size_t chunk_word_size);
coleenp@3602 488
coleenp@3602 489 };
coleenp@3602 490
coleenp@3602 491 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 492 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 493 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 494
coleenp@3602 495 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 496 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 497 friend class Metaspace;
coleenp@3602 498 friend class Metadebug;
coleenp@3602 499
coleenp@3602 500 private:
jmasa@3947 501
coleenp@3602 502 // protects allocations and contains.
coleenp@3602 503 Mutex* const _lock;
coleenp@3602 504
jmasa@3947 505 // Chunk related size
jmasa@3947 506 size_t _medium_chunk_bunch;
jmasa@3947 507
coleenp@3602 508 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 509 // are done from the current chunk. The list is used for deallocating
coleenp@3602 510 // chunks when the SpaceManager is freed.
jmasa@3761 511 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 512 Metachunk* _current_chunk;
coleenp@3602 513
coleenp@3602 514 // Virtual space where allocation comes from.
coleenp@3602 515 VirtualSpaceList* _vs_list;
coleenp@3602 516
coleenp@3602 517 // Number of small chunks to allocate to a manager
coleenp@3602 518 // If class space manager, small chunks are unlimited
coleenp@3602 519 static uint const _small_chunk_limit;
coleenp@3602 520 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 521
coleenp@3602 522 // Sum of all space in allocated chunks
coleenp@3602 523 size_t _allocation_total;
coleenp@3602 524
coleenp@3602 525 // Free lists of blocks are per SpaceManager since they
coleenp@3602 526 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 527 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 528 // the class loader using the SpaceManager is collected.
coleenp@3602 529 BlockFreelist _block_freelists;
coleenp@3602 530
coleenp@3602 531 // protects virtualspace and chunk expansions
coleenp@3602 532 static const char* _expand_lock_name;
coleenp@3602 533 static const int _expand_lock_rank;
coleenp@3602 534 static Mutex* const _expand_lock;
coleenp@3602 535
jmasa@3947 536 private:
coleenp@3602 537 // Accessors
coleenp@3602 538 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 539 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 540
coleenp@3602 541 BlockFreelist* block_freelists() const {
coleenp@3602 542 return (BlockFreelist*) &_block_freelists;
coleenp@3602 543 }
coleenp@3602 544
coleenp@3602 545 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 546
coleenp@3602 547 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 548 void set_current_chunk(Metachunk* v) {
coleenp@3602 549 _current_chunk = v;
coleenp@3602 550 }
coleenp@3602 551
coleenp@3602 552 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 553
coleenp@3602 554 // Add chunk to the list of chunks in use
coleenp@3602 555 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 556
coleenp@3602 557 Mutex* lock() const { return _lock; }
coleenp@3602 558
jmasa@3947 559 const char* chunk_size_name(ChunkIndex index) const;
jmasa@3947 560
jmasa@3947 561 protected:
jmasa@3947 562 void initialize();
jmasa@3947 563
coleenp@3602 564 public:
jmasa@3947 565 SpaceManager(Mutex* lock,
jmasa@3947 566 VirtualSpaceList* vs_list);
coleenp@3602 567 ~SpaceManager();
coleenp@3602 568
jmasa@3947 569 enum ChunkMultiples {
jmasa@3947 570 MediumChunkMultiple = 4
coleenp@3602 571 };
coleenp@3602 572
coleenp@3602 573 // Accessors
jmasa@3947 574 size_t specialized_chunk_size() { return SpecializedChunk; }
jmasa@3947 575 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; }
jmasa@3947 576 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; }
jmasa@3947 577 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
jmasa@3947 578
coleenp@3602 579 size_t allocation_total() const { return _allocation_total; }
coleenp@3602 580 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); }
jmasa@3947 581 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@3602 582
coleenp@3602 583 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 584
jmasa@3947 585 // Set the sizes for the initial chunks.
jmasa@3947 586 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 587 size_t* chunk_word_size,
jmasa@3947 588 size_t* class_chunk_word_size);
jmasa@3947 589
coleenp@3602 590 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 591 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 592 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 593 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 594 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 595
coleenp@3602 596 size_t sum_count_in_chunks_in_use();
coleenp@3602 597 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 598
jmasa@3947 599 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@3947 600
coleenp@3602 601 // Block allocation and deallocation.
coleenp@3602 602 // Allocates a block from the current chunk
coleenp@3602 603 MetaWord* allocate(size_t word_size);
coleenp@3602 604
coleenp@3602 605 // Helper for allocations
jmasa@3761 606 MetaWord* allocate_work(size_t word_size);
coleenp@3602 607
coleenp@3602 608 // Returns a block to the per manager freelist
jmasa@3761 609 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 610
coleenp@3602 611 // Based on the allocation size and a minimum chunk size,
coleenp@3602 612 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 613 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 614
coleenp@3602 615 // Called when an allocation from the current chunk fails.
coleenp@3602 616 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 617 // and allocates from that chunk.
jmasa@3761 618 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 619
coleenp@3602 620 // debugging support.
coleenp@3602 621
coleenp@3602 622 void dump(outputStream* const out) const;
coleenp@3602 623 void print_on(outputStream* st) const;
coleenp@3602 624 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 625
coleenp@3602 626 void verify();
jmasa@3892 627 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 628 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 629 #ifdef ASSERT
coleenp@3602 630 void verify_allocation_total();
coleenp@3602 631 #endif
coleenp@3602 632 };
coleenp@3602 633
coleenp@3602 634 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 635
coleenp@3602 636 const char* SpaceManager::_expand_lock_name =
coleenp@3602 637 "SpaceManager chunk allocation lock";
coleenp@3602 638 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 639 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 640 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 641 SpaceManager::_expand_lock_name,
coleenp@3602 642 Mutex::_allow_vm_block_flag);
coleenp@3602 643
coleenp@3602 644 // BlockFreelist methods
coleenp@3602 645
coleenp@3602 646 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 647
coleenp@3602 648 BlockFreelist::~BlockFreelist() {
coleenp@3602 649 if (_dictionary != NULL) {
coleenp@3602 650 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 651 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 652 }
coleenp@3602 653 delete _dictionary;
coleenp@3602 654 }
coleenp@3602 655 }
coleenp@3602 656
jmasa@3761 657 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 658 Metablock* block = (Metablock*) p;
jmasa@3761 659 block->set_word_size(word_size);
jmasa@3761 660 block->set_prev(NULL);
jmasa@3761 661 block->set_next(NULL);
jmasa@3761 662
coleenp@3602 663 return block;
coleenp@3602 664 }
coleenp@3602 665
jmasa@3761 666 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 667 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 668 if (dictionary() == NULL) {
jmasa@3761 669 _dictionary = new BlockTreeDictionary();
coleenp@3602 670 }
jmasa@3761 671 dictionary()->return_chunk(free_chunk);
coleenp@3602 672 }
coleenp@3602 673
jmasa@3761 674 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 675 if (dictionary() == NULL) {
coleenp@3602 676 return NULL;
coleenp@3602 677 }
coleenp@3602 678
jmasa@3761 679 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 680 // Dark matter. Too small for dictionary.
coleenp@3602 681 return NULL;
coleenp@3602 682 }
jmasa@3761 683
jmasa@3761 684 Metablock* free_block =
jmasa@3761 685 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 686 if (free_block == NULL) {
jmasa@3761 687 return NULL;
jmasa@3761 688 }
jmasa@3761 689
jmasa@3761 690 return (MetaWord*) free_block;
coleenp@3602 691 }
coleenp@3602 692
coleenp@3602 693 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 694 if (dictionary() == NULL) {
coleenp@3602 695 return;
coleenp@3602 696 }
coleenp@3602 697 dictionary()->print_free_lists(st);
coleenp@3602 698 }
coleenp@3602 699
coleenp@3602 700 // VirtualSpaceNode methods
coleenp@3602 701
coleenp@3602 702 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 703 _rs.release();
coleenp@3602 704 }
coleenp@3602 705
coleenp@3602 706 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 707 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 708 }
coleenp@3602 709
coleenp@3602 710 // Space committed in the VirtualSpace
coleenp@3602 711 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 712 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 713 }
coleenp@3602 714
coleenp@3602 715
coleenp@3602 716 // Allocates the chunk from the virtual space only.
coleenp@3602 717 // This interface is also used internally for debugging. Not all
coleenp@3602 718 // chunks removed here are necessarily used for allocation.
coleenp@3602 719 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 720 // Bottom of the new chunk
coleenp@3602 721 MetaWord* chunk_limit = top();
coleenp@3602 722 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 723
coleenp@3602 724 if (!is_available(chunk_word_size)) {
coleenp@3602 725 if (TraceMetadataChunkAllocation) {
coleenp@3602 726 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 727 // Dump some information about the virtual space that is nearly full
coleenp@3602 728 print_on(tty);
coleenp@3602 729 }
coleenp@3602 730 return NULL;
coleenp@3602 731 }
coleenp@3602 732
coleenp@3602 733 // Take the space (bump top on the current virtual space).
coleenp@3602 734 inc_top(chunk_word_size);
coleenp@3602 735
coleenp@3602 736 // Point the chunk at the space
coleenp@3602 737 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size);
coleenp@3602 738 return result;
coleenp@3602 739 }
coleenp@3602 740
coleenp@3602 741
coleenp@3602 742 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 743 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 744 size_t bytes = words * BytesPerWord;
coleenp@3602 745 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 746 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 747 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 748 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 749 virtual_space()->print();
coleenp@3602 750 }
coleenp@3602 751 return result;
coleenp@3602 752 }
coleenp@3602 753
coleenp@3602 754 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 755 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 756 size_t bytes = words * BytesPerWord;
coleenp@3602 757 virtual_space()->shrink_by(bytes);
coleenp@3602 758 return true;
coleenp@3602 759 }
coleenp@3602 760
coleenp@3602 761 // Add another chunk to the chunk list.
coleenp@3602 762
coleenp@3602 763 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 764 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 765 Metachunk* result = NULL;
coleenp@3602 766
coleenp@3602 767 return take_from_committed(chunk_word_size);
coleenp@3602 768 }
coleenp@3602 769
coleenp@3602 770 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 771 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 772
coleenp@3602 773 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 774
coleenp@3602 775 if (new_chunk == NULL) {
coleenp@3602 776 // Only a small part of the virtualspace is committed when first
coleenp@3602 777 // allocated so committing more here can be expected.
coleenp@3602 778 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 779 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 780 page_size_words);
coleenp@3602 781 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 782 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 783 }
coleenp@3602 784 return new_chunk;
coleenp@3602 785 }
coleenp@3602 786
coleenp@3602 787 bool VirtualSpaceNode::initialize() {
coleenp@3602 788
coleenp@3602 789 if (!_rs.is_reserved()) {
coleenp@3602 790 return false;
coleenp@3602 791 }
coleenp@3602 792
jmasa@3947 793 // An allocation out of this Virtualspace that is larger
jmasa@3947 794 // than an initial commit size can waste that initial committed
jmasa@3947 795 // space.
jmasa@3947 796 size_t committed_byte_size = 0;
coleenp@3602 797 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 798 if (result) {
coleenp@3602 799 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 800 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 801 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 802
coleenp@3603 803 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 804 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 805 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 806 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 807 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 808 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 809 _rs.size() / BytesPerWord));
coleenp@3602 810 }
coleenp@3602 811
coleenp@3602 812 return result;
coleenp@3602 813 }
coleenp@3602 814
coleenp@3602 815 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 816 size_t used = used_words_in_vs();
coleenp@3602 817 size_t capacity = capacity_words_in_vs();
coleenp@3602 818 VirtualSpace* vs = virtual_space();
coleenp@3602 819 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 820 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 821 PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@3947 822 vs, capacity / K,
jmasa@3947 823 capacity == 0 ? 0 : used * 100 / capacity,
coleenp@3602 824 bottom(), top(), end(),
coleenp@3602 825 vs->high_boundary());
coleenp@3602 826 }
coleenp@3602 827
coleenp@3869 828 #ifdef ASSERT
coleenp@3602 829 void VirtualSpaceNode::mangle() {
coleenp@3602 830 size_t word_size = capacity_words_in_vs();
coleenp@3602 831 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 832 }
coleenp@3869 833 #endif // ASSERT
coleenp@3602 834
coleenp@3602 835 // VirtualSpaceList methods
coleenp@3602 836 // Space allocated from the VirtualSpace
coleenp@3602 837
coleenp@3602 838 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 839 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 840 while (iter.repeat()) {
coleenp@3602 841 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 842 delete vsl;
coleenp@3602 843 }
coleenp@3602 844 }
coleenp@3602 845
coleenp@3602 846 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 847 size_t allocated_by_vs = 0;
coleenp@3602 848 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 849 while (iter.repeat()) {
coleenp@3602 850 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 851 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 852 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 853 }
coleenp@3602 854 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 855 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 856 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 857 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 858 size_t used =
coleenp@3602 859 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 860 return used;
coleenp@3602 861 }
coleenp@3602 862
coleenp@3602 863 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 864 // for metadata. This is the upper limit on the capacity
coleenp@3602 865 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 866 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 867 size_t capacity = 0;
coleenp@3602 868 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 869 while (iter.repeat()) {
coleenp@3602 870 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 871 capacity += vsl->capacity_words_in_vs();
coleenp@3602 872 }
coleenp@3602 873 return capacity;
coleenp@3602 874 }
coleenp@3602 875
coleenp@3602 876 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 877 _is_class(false),
coleenp@3602 878 _virtual_space_list(NULL),
coleenp@3602 879 _current_virtual_space(NULL),
coleenp@3602 880 _virtual_space_total(0),
coleenp@3602 881 _virtual_space_count(0) {
coleenp@3602 882 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 883 Mutex::_no_safepoint_check_flag);
coleenp@3602 884 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 885
jmasa@4497 886 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 887 _chunk_manager.free_chunks(SmallIndex)->set_size(SmallChunk);
jmasa@4497 888 _chunk_manager.free_chunks(MediumIndex)->set_size(MediumChunk);
coleenp@3602 889 assert(initialization_succeeded,
coleenp@3602 890 " VirtualSpaceList initialization should not fail");
coleenp@3602 891 }
coleenp@3602 892
coleenp@3602 893 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 894 _is_class(true),
coleenp@3602 895 _virtual_space_list(NULL),
coleenp@3602 896 _current_virtual_space(NULL),
coleenp@3602 897 _virtual_space_total(0),
coleenp@3602 898 _virtual_space_count(0) {
coleenp@3602 899 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 900 Mutex::_no_safepoint_check_flag);
coleenp@3602 901 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 902 bool succeeded = class_entry->initialize();
jmasa@4497 903 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 904 _chunk_manager.free_chunks(SmallIndex)->set_size(ClassSmallChunk);
jmasa@4497 905 _chunk_manager.free_chunks(MediumIndex)->set_size(ClassMediumChunk);
coleenp@3602 906 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 907 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 908 }
coleenp@3602 909
coleenp@3602 910 // Allocate another meta virtual space and add it to the list.
coleenp@3602 911 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 912 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 913 if (vs_word_size == 0) {
coleenp@3602 914 return false;
coleenp@3602 915 }
coleenp@3602 916 // Reserve the space
coleenp@3602 917 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 918 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 919
coleenp@3602 920 // Allocate the meta virtual space and initialize it.
coleenp@3602 921 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 922 if (!new_entry->initialize()) {
coleenp@3602 923 delete new_entry;
coleenp@3602 924 return false;
coleenp@3602 925 } else {
coleenp@3860 926 // ensure lock-free iteration sees fully initialized node
coleenp@3860 927 OrderAccess::storestore();
coleenp@3602 928 link_vs(new_entry, vs_word_size);
coleenp@3602 929 return true;
coleenp@3602 930 }
coleenp@3602 931 }
coleenp@3602 932
coleenp@3602 933 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 934 if (virtual_space_list() == NULL) {
coleenp@3602 935 set_virtual_space_list(new_entry);
coleenp@3602 936 } else {
coleenp@3602 937 current_virtual_space()->set_next(new_entry);
coleenp@3602 938 }
coleenp@3602 939 set_current_virtual_space(new_entry);
coleenp@3602 940 inc_virtual_space_total(vs_word_size);
coleenp@3602 941 inc_virtual_space_count();
coleenp@3602 942 #ifdef ASSERT
coleenp@3602 943 new_entry->mangle();
coleenp@3602 944 #endif
coleenp@3602 945 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 946 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 947 vsl->print_on(tty);
coleenp@3602 948 }
coleenp@3602 949 }
coleenp@3602 950
coleenp@3602 951 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@3947 952 size_t grow_chunks_by_words,
jmasa@3947 953 size_t medium_chunk_bunch) {
coleenp@3602 954
coleenp@3602 955 // Get a chunk from the chunk freelist
coleenp@3602 956 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 957
coleenp@3602 958 // Allocate a chunk out of the current virtual space.
coleenp@3602 959 if (next == NULL) {
coleenp@3602 960 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 961 }
coleenp@3602 962
coleenp@3602 963 if (next == NULL) {
coleenp@3602 964 // Not enough room in current virtual space. Try to commit
coleenp@3602 965 // more space.
jmasa@3947 966 size_t expand_vs_by_words = MAX2(medium_chunk_bunch,
jmasa@3947 967 grow_chunks_by_words);
coleenp@3602 968 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 969 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 970 page_size_words);
coleenp@3602 971 bool vs_expanded =
coleenp@3602 972 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 973 if (!vs_expanded) {
coleenp@3602 974 // Should the capacity of the metaspaces be expanded for
coleenp@3602 975 // this allocation? If it's the virtual space for classes and is
coleenp@3602 976 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 977 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 978 // Get another virtual space.
coleenp@3602 979 size_t grow_vs_words =
coleenp@3602 980 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 981 if (grow_vs(grow_vs_words)) {
coleenp@3602 982 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 983 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 984 }
coleenp@3602 985 } else {
coleenp@3602 986 // Allocation will fail and induce a GC
coleenp@3602 987 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 988 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 989 " Fail instead of expand the metaspace");
coleenp@3602 990 }
coleenp@3602 991 }
coleenp@3602 992 } else {
coleenp@3602 993 // The virtual space expanded, get a new chunk
coleenp@3602 994 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 995 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 996 }
coleenp@3602 997 }
coleenp@3602 998
jmasa@3947 999 assert(next == NULL || (next->next() == NULL && next->prev() == NULL),
jmasa@3947 1000 "New chunk is still on some list");
coleenp@3602 1001 return next;
coleenp@3602 1002 }
coleenp@3602 1003
jmasa@3947 1004 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size,
jmasa@3947 1005 size_t chunk_bunch) {
jmasa@3947 1006 // Get a chunk from the chunk freelist
jmasa@3947 1007 Metachunk* new_chunk = get_new_chunk(chunk_word_size,
jmasa@3947 1008 chunk_word_size,
jmasa@3947 1009 chunk_bunch);
jmasa@3947 1010 return new_chunk;
jmasa@3947 1011 }
jmasa@3947 1012
coleenp@3602 1013 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1014 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1015 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1016 while (iter.repeat()) {
coleenp@3602 1017 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1018 node->print_on(st);
coleenp@3602 1019 }
coleenp@3602 1020 }
coleenp@3602 1021 }
coleenp@3602 1022
coleenp@3602 1023 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1024 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1025 VirtualSpaceListIterator iter(list);
coleenp@3602 1026 while (iter.repeat()) {
coleenp@3602 1027 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1028 if (node->reserved()->contains(ptr)) {
coleenp@3602 1029 return true;
coleenp@3602 1030 }
coleenp@3602 1031 }
coleenp@3602 1032 return false;
coleenp@3602 1033 }
coleenp@3602 1034
coleenp@3602 1035
coleenp@3602 1036 // MetaspaceGC methods
coleenp@3602 1037
coleenp@3602 1038 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1039 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1040 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1041 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1042 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1043 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1044 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1045 //
coleenp@3602 1046 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1047 // resize the capacity of the metaspaces. The current implementation
jmasa@4146 1048 // is based on the flags MinMetaspaceFreeRatio and MaxHeapFreeRatio used
coleenp@3602 1049 // to resize the Java heap by some GC's. New flags can be implemented
coleenp@3602 1050 // if really needed. MinHeapFreeRatio is used to calculate how much
coleenp@3602 1051 // free space is desirable in the metaspace capacity to decide how much
jmasa@4146 1052 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
coleenp@3602 1053 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1054 // the HWM.
coleenp@3602 1055
coleenp@3602 1056 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1057 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1058 // another expansion is not requested too soon. If that is not
coleenp@3602 1059 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1060 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1061 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1062 // some.
coleenp@3602 1063 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1064 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1065 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1066 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1067 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1068 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1069 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1070 if (delta_words > min_delta_words) {
coleenp@3602 1071 // Don't want to hit the high water mark on the next
coleenp@3602 1072 // allocation so make the delta greater than just enough
coleenp@3602 1073 // for this allocation.
coleenp@3602 1074 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1075 if (delta_words > max_delta_words) {
coleenp@3602 1076 // This allocation is large but the next ones are probably not
coleenp@3602 1077 // so increase by the minimum.
coleenp@3602 1078 delta_words = delta_words + min_delta_words;
coleenp@3602 1079 }
coleenp@3602 1080 }
coleenp@3602 1081 return delta_words;
coleenp@3602 1082 }
coleenp@3602 1083
coleenp@3602 1084 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
mgerdin@4355 1085 // If the user wants a limit, impose one.
mgerdin@4355 1086 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
mgerdin@4355 1087 MetaspaceAux::reserved_in_bytes() >= MaxMetaspaceSize) {
mgerdin@4355 1088 return false;
mgerdin@4355 1089 }
coleenp@3602 1090
coleenp@3602 1091 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1092 // metadata virtual space.
coleenp@3602 1093 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1094
coleenp@3602 1095 // If this is part of an allocation after a GC, expand
coleenp@3602 1096 // unconditionally.
coleenp@3602 1097 if(MetaspaceGC::expand_after_GC()) {
coleenp@3602 1098 return true;
coleenp@3602 1099 }
coleenp@3602 1100
mgerdin@4355 1101 size_t metaspace_size_words = MetaspaceSize / BytesPerWord;
mgerdin@4355 1102
coleenp@3602 1103 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1104 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1105 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1106 // until that minimum capacity is exceeded.
coleenp@3602 1107 if (vsl->capacity_words_sum() < metaspace_size_words ||
coleenp@3602 1108 capacity_until_GC() == 0) {
coleenp@3602 1109 set_capacity_until_GC(metaspace_size_words);
coleenp@3602 1110 return true;
coleenp@3602 1111 } else {
coleenp@3602 1112 if (vsl->capacity_words_sum() < capacity_until_GC()) {
coleenp@3602 1113 return true;
coleenp@3602 1114 } else {
coleenp@3602 1115 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1116 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1117 " capacity_until_GC " SIZE_FORMAT
coleenp@3602 1118 " capacity_words_sum " SIZE_FORMAT
coleenp@3602 1119 " used_words_sum " SIZE_FORMAT
coleenp@3602 1120 " free chunks " SIZE_FORMAT
coleenp@3602 1121 " free chunks count %d",
coleenp@3602 1122 word_size,
coleenp@3602 1123 capacity_until_GC(),
coleenp@3602 1124 vsl->capacity_words_sum(),
coleenp@3602 1125 vsl->used_words_sum(),
coleenp@3602 1126 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1127 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1128 }
coleenp@3602 1129 return false;
coleenp@3602 1130 }
coleenp@3602 1131 }
coleenp@3602 1132 }
coleenp@3602 1133
coleenp@3602 1134 // Variables are in bytes
coleenp@3602 1135
coleenp@3602 1136 void MetaspaceGC::compute_new_size() {
coleenp@3602 1137 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1138 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1139 _shrink_factor = 0;
coleenp@3602 1140
coleenp@3602 1141 VirtualSpaceList *vsl = Metaspace::space_list();
coleenp@3602 1142
coleenp@3602 1143 size_t capacity_after_gc = vsl->capacity_bytes_sum();
coleenp@3602 1144 // Check to see if these two can be calculated without walking the CLDG
coleenp@3602 1145 size_t used_after_gc = vsl->used_bytes_sum();
coleenp@3602 1146 size_t capacity_until_GC = vsl->capacity_bytes_sum();
coleenp@3602 1147 size_t free_after_gc = capacity_until_GC - used_after_gc;
coleenp@3602 1148
jmasa@4146 1149 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1150 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1151
coleenp@3602 1152 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1153 size_t minimum_desired_capacity =
coleenp@3602 1154 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1155 // Don't shrink less than the initial generation size
coleenp@3602 1156 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1157 MetaspaceSize);
coleenp@3602 1158
coleenp@3602 1159 if (PrintGCDetails && Verbose) {
coleenp@3602 1160 const double free_percentage = ((double)free_after_gc) / capacity_until_GC;
coleenp@3602 1161 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1162 gclog_or_tty->print_cr(" "
coleenp@3602 1163 " minimum_free_percentage: %6.2f"
coleenp@3602 1164 " maximum_used_percentage: %6.2f",
coleenp@3602 1165 minimum_free_percentage,
coleenp@3602 1166 maximum_used_percentage);
coleenp@3602 1167 double d_free_after_gc = free_after_gc / (double) K;
coleenp@3602 1168 gclog_or_tty->print_cr(" "
coleenp@3602 1169 " free_after_gc : %6.1fK"
coleenp@3602 1170 " used_after_gc : %6.1fK"
coleenp@3602 1171 " capacity_after_gc : %6.1fK"
coleenp@3602 1172 " metaspace HWM : %6.1fK",
coleenp@3602 1173 free_after_gc / (double) K,
coleenp@3602 1174 used_after_gc / (double) K,
coleenp@3602 1175 capacity_after_gc / (double) K,
coleenp@3602 1176 capacity_until_GC / (double) K);
coleenp@3602 1177 gclog_or_tty->print_cr(" "
coleenp@3602 1178 " free_percentage: %6.2f",
coleenp@3602 1179 free_percentage);
coleenp@3602 1180 }
coleenp@3602 1181
coleenp@3602 1182
coleenp@3602 1183 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1184 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1185 // increment the HWM.
coleenp@3602 1186 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1187 // Don't expand unless it's significant
coleenp@3602 1188 if (expand_bytes >= MinMetaspaceExpansion) {
coleenp@3602 1189 size_t expand_words = expand_bytes / BytesPerWord;
coleenp@3602 1190 MetaspaceGC::inc_capacity_until_GC(expand_words);
coleenp@3602 1191 }
coleenp@3602 1192 if (PrintGCDetails && Verbose) {
coleenp@3602 1193 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1194 gclog_or_tty->print_cr(" expanding:"
coleenp@3602 1195 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1196 " expand_words: %6.1fK"
coleenp@3602 1197 " MinMetaspaceExpansion: %6.1fK"
coleenp@3602 1198 " new metaspace HWM: %6.1fK",
coleenp@3602 1199 minimum_desired_capacity / (double) K,
coleenp@3602 1200 expand_bytes / (double) K,
coleenp@3602 1201 MinMetaspaceExpansion / (double) K,
coleenp@3602 1202 new_capacity_until_GC / (double) K);
coleenp@3602 1203 }
coleenp@3602 1204 return;
coleenp@3602 1205 }
coleenp@3602 1206
coleenp@3602 1207 // No expansion, now see if we want to shrink
coleenp@3602 1208 size_t shrink_words = 0;
coleenp@3602 1209 // We would never want to shrink more than this
coleenp@3602 1210 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity;
coleenp@3602 1211 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT,
coleenp@3602 1212 max_shrink_words));
coleenp@3602 1213
coleenp@3602 1214 // Should shrinking be considered?
jmasa@4146 1215 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1216 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1217 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1218 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1219 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1220 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1221 MetaspaceSize);
coleenp@3602 1222 if (PrintGC && Verbose) {
coleenp@3602 1223 gclog_or_tty->print_cr(" "
coleenp@3602 1224 " maximum_free_percentage: %6.2f"
coleenp@3602 1225 " minimum_used_percentage: %6.2f",
coleenp@3602 1226 maximum_free_percentage,
coleenp@3602 1227 minimum_used_percentage);
coleenp@3602 1228 gclog_or_tty->print_cr(" "
coleenp@3602 1229 " capacity_until_GC: %6.1fK"
coleenp@3602 1230 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1231 " maximum_desired_capacity: %6.1fK",
coleenp@3602 1232 capacity_until_GC / (double) K,
coleenp@3602 1233 minimum_desired_capacity / (double) K,
coleenp@3602 1234 maximum_desired_capacity / (double) K);
coleenp@3602 1235 }
coleenp@3602 1236
coleenp@3602 1237 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1238 "sanity check");
coleenp@3602 1239
coleenp@3602 1240 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1241 // Capacity too large, compute shrinking size
coleenp@3602 1242 shrink_words = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1243 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1244 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1245 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1246 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1247 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1248 // size without shrinking, it goes back to 0%.
coleenp@3602 1249 shrink_words = shrink_words / 100 * current_shrink_factor;
coleenp@3602 1250 assert(shrink_words <= max_shrink_words,
coleenp@3602 1251 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
coleenp@3602 1252 shrink_words, max_shrink_words));
coleenp@3602 1253 if (current_shrink_factor == 0) {
coleenp@3602 1254 _shrink_factor = 10;
coleenp@3602 1255 } else {
coleenp@3602 1256 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1257 }
coleenp@3602 1258 if (PrintGCDetails && Verbose) {
coleenp@3602 1259 gclog_or_tty->print_cr(" "
coleenp@3602 1260 " shrinking:"
coleenp@3602 1261 " initSize: %.1fK"
coleenp@3602 1262 " maximum_desired_capacity: %.1fK",
coleenp@3602 1263 MetaspaceSize / (double) K,
coleenp@3602 1264 maximum_desired_capacity / (double) K);
coleenp@3602 1265 gclog_or_tty->print_cr(" "
coleenp@3602 1266 " shrink_words: %.1fK"
coleenp@3602 1267 " current_shrink_factor: %d"
coleenp@3602 1268 " new shrink factor: %d"
coleenp@3602 1269 " MinMetaspaceExpansion: %.1fK",
coleenp@3602 1270 shrink_words / (double) K,
coleenp@3602 1271 current_shrink_factor,
coleenp@3602 1272 _shrink_factor,
coleenp@3602 1273 MinMetaspaceExpansion / (double) K);
coleenp@3602 1274 }
coleenp@3602 1275 }
coleenp@3602 1276 }
coleenp@3602 1277
coleenp@3602 1278
coleenp@3602 1279 // Don't shrink unless it's significant
coleenp@3602 1280 if (shrink_words >= MinMetaspaceExpansion) {
coleenp@3602 1281 VirtualSpaceNode* csp = vsl->current_virtual_space();
coleenp@3602 1282 size_t available_to_shrink = csp->capacity_words_in_vs() -
coleenp@3602 1283 csp->used_words_in_vs();
coleenp@3602 1284 shrink_words = MIN2(shrink_words, available_to_shrink);
coleenp@3602 1285 csp->shrink_by(shrink_words);
coleenp@3602 1286 MetaspaceGC::dec_capacity_until_GC(shrink_words);
coleenp@3602 1287 if (PrintGCDetails && Verbose) {
coleenp@3602 1288 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1289 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K);
coleenp@3602 1290 }
coleenp@3602 1291 }
mgerdin@4349 1292 assert(used_after_gc <= vsl->capacity_bytes_sum(),
coleenp@3602 1293 "sanity check");
coleenp@3602 1294
coleenp@3602 1295 }
coleenp@3602 1296
coleenp@3602 1297 // Metadebug methods
coleenp@3602 1298
coleenp@3602 1299 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1300 size_t chunk_word_size){
coleenp@3602 1301 #ifdef ASSERT
coleenp@3602 1302 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1303 if (MetaDataDeallocateALot &&
coleenp@3602 1304 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1305 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1306 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1307 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1308 if (dummy_chunk == NULL) {
coleenp@3602 1309 break;
coleenp@3602 1310 }
coleenp@3602 1311 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1312
coleenp@3602 1313 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1314 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1315 sm->sum_count_in_chunks_in_use());
coleenp@3602 1316 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1317 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1318 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1319 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1320 }
coleenp@3602 1321 }
coleenp@3602 1322 } else {
coleenp@3602 1323 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1324 }
coleenp@3602 1325 #endif
coleenp@3602 1326 }
coleenp@3602 1327
coleenp@3602 1328 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1329 size_t raw_word_size){
coleenp@3602 1330 #ifdef ASSERT
coleenp@3602 1331 if (MetaDataDeallocateALot &&
coleenp@3602 1332 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1333 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1334 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1335 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1336 if (dummy_block == 0) {
coleenp@3602 1337 break;
coleenp@3602 1338 }
jmasa@3761 1339 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1340 }
coleenp@3602 1341 } else {
coleenp@3602 1342 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1343 }
coleenp@3602 1344 #endif
coleenp@3602 1345 }
coleenp@3602 1346
coleenp@3602 1347 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1348 if (MetadataAllocationFailALot) {
coleenp@3602 1349 _allocation_fail_alot_count =
coleenp@3602 1350 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1351 }
coleenp@3602 1352 }
coleenp@3602 1353
coleenp@3602 1354 #ifdef ASSERT
coleenp@3602 1355 bool Metadebug::test_metadata_failure() {
coleenp@3602 1356 if (MetadataAllocationFailALot &&
coleenp@3602 1357 Threads::is_vm_complete()) {
coleenp@3602 1358 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1359 _allocation_fail_alot_count--;
coleenp@3602 1360 } else {
coleenp@3602 1361 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1362 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1363 "MetadataAllocationFailALot");
coleenp@3602 1364 }
coleenp@3602 1365 init_allocation_fail_alot_count();
coleenp@3602 1366 return true;
coleenp@3602 1367 }
coleenp@3602 1368 }
coleenp@3602 1369 return false;
coleenp@3602 1370 }
coleenp@3602 1371 #endif
coleenp@3602 1372
coleenp@3602 1373 // ChunkManager methods
coleenp@3602 1374
coleenp@3602 1375 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1376 // work with the CMS collector because its use of additional locks
coleenp@3602 1377 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1378 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1379
coleenp@3602 1380 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1381 #ifdef ASSERT
coleenp@3602 1382 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1383 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1384 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1385 slow_locked_verify_free_chunks_total();
coleenp@3602 1386 }
coleenp@3602 1387 #endif
coleenp@3602 1388 return _free_chunks_total;
coleenp@3602 1389 }
coleenp@3602 1390
coleenp@3602 1391 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1392 return free_chunks_total() * BytesPerWord;
coleenp@3602 1393 }
coleenp@3602 1394
coleenp@3602 1395 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1396 #ifdef ASSERT
coleenp@3602 1397 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1398 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1399 Mutex::_no_safepoint_check_flag);
coleenp@3602 1400 // This lock is only needed in debug because the verification
coleenp@3602 1401 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1402 slow_locked_verify_free_chunks_count();
coleenp@3602 1403 }
coleenp@3602 1404 #endif
mgerdin@3829 1405 return _free_chunks_count;
coleenp@3602 1406 }
coleenp@3602 1407
coleenp@3602 1408 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1409 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1410 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1411 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1412 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1413 sum_free_chunks()));
coleenp@3602 1414 }
coleenp@3602 1415
coleenp@3602 1416 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1417 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1418 Mutex::_no_safepoint_check_flag);
coleenp@3602 1419 locked_verify_free_chunks_total();
coleenp@3602 1420 }
coleenp@3602 1421
coleenp@3602 1422 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1423 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1424 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1425 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1426 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1427 sum_free_chunks_count()));
coleenp@3602 1428 }
coleenp@3602 1429
coleenp@3602 1430 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1431 #ifdef ASSERT
coleenp@3602 1432 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1433 Mutex::_no_safepoint_check_flag);
coleenp@3602 1434 locked_verify_free_chunks_count();
coleenp@3602 1435 #endif
coleenp@3602 1436 }
coleenp@3602 1437
coleenp@3602 1438 void ChunkManager::verify() {
mgerdin@3829 1439 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1440 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1441 locked_verify();
coleenp@3602 1442 }
coleenp@3602 1443
coleenp@3602 1444 void ChunkManager::locked_verify() {
jmasa@3761 1445 locked_verify_free_chunks_count();
coleenp@3602 1446 locked_verify_free_chunks_total();
coleenp@3602 1447 }
coleenp@3602 1448
coleenp@3602 1449 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1450 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1451 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1452 _free_chunks_total, _free_chunks_count);
coleenp@3602 1453 }
coleenp@3602 1454
coleenp@3602 1455 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1456 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1457 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1458 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1459 }
coleenp@3602 1460 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1461 return &_free_chunks[index];
coleenp@3602 1462 }
coleenp@3602 1463
coleenp@3602 1464 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1465 // methods that are used in product builds.
coleenp@3602 1466 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1467 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1468 size_t result = 0;
jmasa@3947 1469 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1470 ChunkList* list = free_chunks(i);
coleenp@3602 1471
coleenp@3602 1472 if (list == NULL) {
coleenp@3602 1473 continue;
coleenp@3602 1474 }
coleenp@3602 1475
jmasa@4497 1476 result = result + list->count() * list->size();
coleenp@3602 1477 }
jmasa@3761 1478 result = result + humongous_dictionary()->total_size();
coleenp@3602 1479 return result;
coleenp@3602 1480 }
coleenp@3602 1481
coleenp@3602 1482 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1483 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1484 size_t count = 0;
jmasa@3947 1485 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1486 ChunkList* list = free_chunks(i);
coleenp@3602 1487 if (list == NULL) {
coleenp@3602 1488 continue;
coleenp@3602 1489 }
jmasa@4497 1490 count = count + list->count();
coleenp@3602 1491 }
jmasa@3761 1492 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1493 return count;
coleenp@3602 1494 }
coleenp@3602 1495
coleenp@3602 1496 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1497 ChunkIndex index = list_index(word_size);
jmasa@3947 1498 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1499 return free_chunks(index);
coleenp@3602 1500 }
coleenp@3602 1501
coleenp@3602 1502 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1503 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1504 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1505 chunk->set_next(free_list->head());
coleenp@3602 1506 free_list->set_head(chunk);
coleenp@3602 1507 // chunk is being returned to the chunk free list
coleenp@3602 1508 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1509 slow_locked_verify();
coleenp@3602 1510 }
coleenp@3602 1511
coleenp@3602 1512 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1513 // The deallocation of a chunk originates in the freelist
coleenp@3602 1514 // manangement code for a Metaspace and does not hold the
coleenp@3602 1515 // lock.
coleenp@3602 1516 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1517 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1518 slow_locked_verify();
coleenp@3602 1519 if (TraceMetadataChunkAllocation) {
coleenp@3602 1520 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1521 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1522 chunk, chunk->word_size());
coleenp@3602 1523 }
coleenp@3602 1524 free_chunks_put(chunk);
coleenp@3602 1525 }
coleenp@3602 1526
coleenp@3602 1527 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1528 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1529
mgerdin@3829 1530 slow_locked_verify();
jmasa@3761 1531
jmasa@3761 1532 Metachunk* chunk = NULL;
jmasa@3947 1533 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1534 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1535 assert(free_list != NULL, "Sanity check");
jmasa@3761 1536
jmasa@3761 1537 chunk = free_list->head();
jmasa@3761 1538 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1539
jmasa@3761 1540 if (chunk == NULL) {
jmasa@3761 1541 return NULL;
jmasa@3761 1542 }
jmasa@3761 1543
coleenp@3602 1544 // Remove the chunk as the head of the list.
jmasa@4497 1545 free_list->remove_chunk(chunk);
jmasa@3947 1546
jmasa@3947 1547 // Chunk is being removed from the chunks free list.
jmasa@3761 1548 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1549
coleenp@3602 1550 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1551 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1552 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1553 free_list, chunk, chunk->word_size());
coleenp@3602 1554 }
coleenp@3602 1555 } else {
jmasa@3761 1556 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1557 word_size,
jmasa@3761 1558 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1559
jmasa@3761 1560 if (chunk != NULL) {
jmasa@3761 1561 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1562 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1563 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1564 " for requested size " SIZE_FORMAT
jmasa@3761 1565 " waste " SIZE_FORMAT,
jmasa@3761 1566 chunk->word_size(), word_size, waste);
coleenp@3602 1567 }
jmasa@3761 1568 // Chunk is being removed from the chunks free list.
jmasa@3761 1569 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3761 1570 #ifdef ASSERT
jmasa@3761 1571 chunk->set_is_free(false);
jmasa@3761 1572 #endif
jmasa@3947 1573 } else {
jmasa@3947 1574 return NULL;
coleenp@3602 1575 }
coleenp@3602 1576 }
jmasa@3947 1577
jmasa@3947 1578 // Remove it from the links to this freelist
jmasa@3947 1579 chunk->set_next(NULL);
jmasa@3947 1580 chunk->set_prev(NULL);
mgerdin@3829 1581 slow_locked_verify();
coleenp@3602 1582 return chunk;
coleenp@3602 1583 }
coleenp@3602 1584
coleenp@3602 1585 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1586 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1587 slow_locked_verify();
coleenp@3602 1588
coleenp@3602 1589 // Take from the beginning of the list
coleenp@3602 1590 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1591 if (chunk == NULL) {
coleenp@3602 1592 return NULL;
coleenp@3602 1593 }
coleenp@3602 1594
jmasa@3947 1595 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1596 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1597 "Non-humongous variable sized chunk");
coleenp@3602 1598 if (TraceMetadataChunkAllocation) {
jmasa@3947 1599 size_t list_count;
jmasa@3947 1600 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1601 ChunkList* list = find_free_chunks_list(word_size);
jmasa@4497 1602 list_count = list->count();
jmasa@3947 1603 } else {
jmasa@3947 1604 list_count = humongous_dictionary()->total_count();
jmasa@3947 1605 }
jmasa@3947 1606 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1607 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1608 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1609 locked_print_free_chunks(tty);
coleenp@3602 1610 }
coleenp@3602 1611
coleenp@3602 1612 return chunk;
coleenp@3602 1613 }
coleenp@3602 1614
jmasa@3761 1615 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1616 if (PrintFLSStatistics != 0) {
jmasa@3761 1617 humongous_dictionary()->report_statistics();
jmasa@3761 1618 }
jmasa@3761 1619 }
jmasa@3761 1620
coleenp@3602 1621 // SpaceManager methods
coleenp@3602 1622
jmasa@3947 1623 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1624 size_t* chunk_word_size,
jmasa@3947 1625 size_t* class_chunk_word_size) {
jmasa@3947 1626 switch (type) {
jmasa@3947 1627 case Metaspace::BootMetaspaceType:
jmasa@3947 1628 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1629 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1630 break;
jmasa@3947 1631 case Metaspace::ROMetaspaceType:
jmasa@3947 1632 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1633 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1634 break;
jmasa@3947 1635 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1636 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1637 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1638 break;
jmasa@3947 1639 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1640 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1641 *chunk_word_size = SpecializedChunk;
jmasa@3947 1642 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1643 break;
jmasa@3947 1644 default:
jmasa@3947 1645 *chunk_word_size = SmallChunk;
jmasa@3947 1646 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1647 break;
jmasa@3947 1648 }
mikael@4113 1649 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1650 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1651 " class " SIZE_FORMAT,
mikael@4113 1652 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1653 }
jmasa@3947 1654
coleenp@3602 1655 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1656 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1657 size_t free = 0;
jmasa@3947 1658 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1659 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1660 while (chunk != NULL) {
coleenp@3602 1661 free += chunk->free_word_size();
coleenp@3602 1662 chunk = chunk->next();
coleenp@3602 1663 }
coleenp@3602 1664 }
coleenp@3602 1665 return free;
coleenp@3602 1666 }
coleenp@3602 1667
coleenp@3602 1668 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1669 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1670 size_t result = 0;
jmasa@3947 1671 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1672 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1673 }
jmasa@3761 1674
coleenp@3602 1675 return result;
coleenp@3602 1676 }
coleenp@3602 1677
coleenp@3602 1678 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1679 size_t result = 0;
coleenp@3602 1680 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1681 // Count the free space in all the chunk but not the
coleenp@3602 1682 // current chunk from which allocations are still being done.
coleenp@3602 1683 if (chunk != NULL) {
jmasa@3761 1684 Metachunk* prev = chunk;
jmasa@3761 1685 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1686 result += chunk->free_word_size();
jmasa@3761 1687 prev = chunk;
coleenp@3602 1688 chunk = chunk->next();
coleenp@3602 1689 }
coleenp@3602 1690 }
coleenp@3602 1691 return result;
coleenp@3602 1692 }
coleenp@3602 1693
coleenp@3602 1694 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
coleenp@3602 1695 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1696 size_t sum = 0;
jmasa@3947 1697 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1698 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1699 while (chunk != NULL) {
coleenp@3602 1700 // Just changed this sum += chunk->capacity_word_size();
coleenp@3602 1701 // sum += chunk->word_size() - Metachunk::overhead();
coleenp@3602 1702 sum += chunk->capacity_word_size();
coleenp@3602 1703 chunk = chunk->next();
coleenp@3602 1704 }
coleenp@3602 1705 }
coleenp@3602 1706 return sum;
coleenp@3602 1707 }
coleenp@3602 1708
coleenp@3602 1709 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1710 size_t count = 0;
jmasa@3947 1711 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1712 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1713 }
jmasa@3761 1714
coleenp@3602 1715 return count;
coleenp@3602 1716 }
coleenp@3602 1717
coleenp@3602 1718 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1719 size_t count = 0;
coleenp@3602 1720 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1721 while (chunk != NULL) {
coleenp@3602 1722 count++;
coleenp@3602 1723 chunk = chunk->next();
coleenp@3602 1724 }
coleenp@3602 1725 return count;
coleenp@3602 1726 }
coleenp@3602 1727
coleenp@3602 1728
coleenp@3602 1729 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1730 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1731 size_t used = 0;
jmasa@3947 1732 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1733 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1734 while (chunk != NULL) {
coleenp@3602 1735 used += chunk->used_word_size();
coleenp@3602 1736 chunk = chunk->next();
coleenp@3602 1737 }
coleenp@3602 1738 }
coleenp@3602 1739 return used;
coleenp@3602 1740 }
coleenp@3602 1741
coleenp@3602 1742 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1743
jmasa@3947 1744 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1745 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1746 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1747 chunk_size_name(i), chunk);
jmasa@3947 1748 if (chunk != NULL) {
jmasa@3947 1749 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1750 chunk->free_word_size());
jmasa@3947 1751 } else {
jmasa@3947 1752 st->print_cr("");
jmasa@3947 1753 }
jmasa@3947 1754 }
coleenp@3602 1755
coleenp@3602 1756 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1757 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1758 }
coleenp@3602 1759
coleenp@3602 1760 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1761
coleenp@3602 1762 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1763 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1764 // once a medium chunk has been allocated, no more small
coleenp@3602 1765 // chunks will be allocated.
coleenp@3602 1766 size_t chunk_word_size;
coleenp@3602 1767 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1768 (!has_small_chunk_limit() ||
coleenp@3602 1769 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
jmasa@3947 1770 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1771 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1772 chunk_word_size = medium_chunk_size();
coleenp@3602 1773 }
coleenp@3602 1774 } else {
jmasa@3947 1775 chunk_word_size = medium_chunk_size();
coleenp@3602 1776 }
coleenp@3602 1777
jmasa@3947 1778 // Might still need a humongous chunk. Enforce an
jmasa@3947 1779 // eight word granularity to facilitate reuse (some
jmasa@3947 1780 // wastage but better chance of reuse).
jmasa@3947 1781 size_t if_humongous_sized_chunk =
jmasa@3947 1782 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1783 HumongousChunkGranularity);
coleenp@3602 1784 chunk_word_size =
jmasa@3947 1785 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1786
jmasa@3947 1787 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1788 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1789 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1790 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1791 word_size, chunk_word_size));
coleenp@3602 1792 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1793 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1794 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1795 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1796 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1797 chunk_word_size);
jmasa@3761 1798 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1799 Metachunk::overhead());
coleenp@3602 1800 }
coleenp@3602 1801 return chunk_word_size;
coleenp@3602 1802 }
coleenp@3602 1803
jmasa@3761 1804 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1805 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1806 "Should have been set");
coleenp@3602 1807 assert(current_chunk() == NULL ||
coleenp@3602 1808 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1809 "Don't need to expand");
coleenp@3602 1810 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1811
coleenp@3602 1812 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1813 size_t words_left = 0;
jmasa@3947 1814 size_t words_used = 0;
jmasa@3947 1815 if (current_chunk() != NULL) {
jmasa@3947 1816 words_left = current_chunk()->free_word_size();
jmasa@3947 1817 words_used = current_chunk()->used_word_size();
jmasa@3947 1818 }
coleenp@3602 1819 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 1820 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 1821 " words left",
jmasa@3947 1822 word_size, words_used, words_left);
coleenp@3602 1823 }
coleenp@3602 1824
coleenp@3602 1825 // Get another chunk out of the virtual space
coleenp@3602 1826 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 1827 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 1828
coleenp@3602 1829 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 1830 // and do an allocation from it.
coleenp@3602 1831 if (next != NULL) {
coleenp@3602 1832 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 1833 // Add to this manager's list of chunks in use.
coleenp@3602 1834 add_chunk(next, false);
coleenp@3602 1835 return next->allocate(word_size);
coleenp@3602 1836 }
coleenp@3602 1837 return NULL;
coleenp@3602 1838 }
coleenp@3602 1839
coleenp@3602 1840 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 1841
jmasa@3947 1842 for (ChunkIndex i = ZeroIndex;
jmasa@3761 1843 i < NumberOfInUseLists ;
coleenp@3602 1844 i = next_chunk_index(i) ) {
coleenp@3602 1845 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 1846 chunks_in_use(i),
coleenp@3602 1847 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 1848 }
coleenp@3602 1849 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 1850 " Humongous " SIZE_FORMAT,
coleenp@3602 1851 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 1852 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 1853 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 1854 // block free lists
jmasa@3761 1855 if (block_freelists() != NULL) {
jmasa@3761 1856 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 1857 block_freelists()->total_size());
jmasa@3761 1858 }
coleenp@3602 1859 }
coleenp@3602 1860
jmasa@3947 1861 SpaceManager::SpaceManager(Mutex* lock,
jmasa@3947 1862 VirtualSpaceList* vs_list) :
coleenp@3602 1863 _vs_list(vs_list),
coleenp@3602 1864 _allocation_total(0),
jmasa@3947 1865 _lock(lock)
jmasa@3947 1866 {
jmasa@3947 1867 initialize();
jmasa@3947 1868 }
jmasa@3947 1869
jmasa@3947 1870 void SpaceManager::initialize() {
coleenp@3602 1871 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 1872 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1873 _chunks_in_use[i] = NULL;
coleenp@3602 1874 }
coleenp@3602 1875 _current_chunk = NULL;
coleenp@3602 1876 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1877 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1878 }
coleenp@3602 1879 }
coleenp@3602 1880
jmasa@4497 1881 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
jmasa@4497 1882 if (chunks == NULL) {
jmasa@4497 1883 return;
jmasa@4497 1884 }
jmasa@4497 1885 ChunkList* list = free_chunks(index);
jmasa@4497 1886 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
jmasa@4497 1887 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4497 1888 Metachunk* cur = chunks;
jmasa@4497 1889
jmasa@4497 1890 // This return chunks one at a time. If a new
jmasa@4497 1891 // class List can be created that is a base class
jmasa@4497 1892 // of FreeList then something like FreeList::prepend()
jmasa@4497 1893 // can be used in place of this loop
jmasa@4497 1894 while (cur != NULL) {
jmasa@4497 1895 // Capture the next link before it is changed
jmasa@4497 1896 // by the call to return_chunk_at_head();
jmasa@4497 1897 Metachunk* next = cur->next();
jmasa@4497 1898 cur->set_is_free(true);
jmasa@4497 1899 list->return_chunk_at_head(cur);
jmasa@4497 1900 cur = next;
jmasa@4497 1901 }
jmasa@4497 1902 }
jmasa@4497 1903
coleenp@3602 1904 SpaceManager::~SpaceManager() {
mgerdin@4349 1905 // This call this->_lock which can't be done while holding expand_lock()
mgerdin@4349 1906 const size_t in_use_before = sum_capacity_in_chunks_in_use();
mgerdin@4349 1907
coleenp@3602 1908 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 1909 Mutex::_no_safepoint_check_flag);
coleenp@3602 1910
coleenp@3602 1911 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 1912
mgerdin@3829 1913 chunk_manager->slow_locked_verify();
coleenp@3602 1914
coleenp@3602 1915 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1916 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1917 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 1918 }
coleenp@3602 1919
coleenp@3869 1920 // Mangle freed memory.
coleenp@3869 1921 NOT_PRODUCT(mangle_freed_chunks();)
coleenp@3869 1922
coleenp@3602 1923 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 1924 // below.
mgerdin@4349 1925 chunk_manager->inc_free_chunks_total(in_use_before,
coleenp@3602 1926 sum_count_in_chunks_in_use());
coleenp@3602 1927
coleenp@3602 1928 // Add all the chunks in use by this space manager
coleenp@3602 1929 // to the global list of free chunks.
coleenp@3602 1930
jmasa@3947 1931 // Follow each list of chunks-in-use and add them to the
jmasa@3947 1932 // free lists. Each list is NULL terminated.
jmasa@3947 1933
jmasa@3947 1934 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 1935 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1936 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 1937 sum_count_in_chunks_in_use(i),
jmasa@3947 1938 chunk_size_name(i));
jmasa@3947 1939 }
jmasa@3947 1940 Metachunk* chunks = chunks_in_use(i);
jmasa@4497 1941 chunk_manager->return_chunks(i, chunks);
jmasa@3947 1942 set_chunks_in_use(i, NULL);
jmasa@3947 1943 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1944 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@4497 1945 chunk_manager->free_chunks(i)->count(),
jmasa@3947 1946 chunk_size_name(i));
jmasa@3947 1947 }
jmasa@3947 1948 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 1949 }
coleenp@3602 1950
jmasa@3947 1951 // The medium chunk case may be optimized by passing the head and
jmasa@3947 1952 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 1953 // the current chunk but there are probably exceptions.
jmasa@3947 1954
coleenp@3602 1955 // Humongous chunks
jmasa@3947 1956 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1957 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 1958 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 1959 chunk_size_name(HumongousIndex));
jmasa@3947 1960 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 1961 }
coleenp@3602 1962 // Humongous chunks are never the current chunk.
coleenp@3602 1963 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 1964
jmasa@3761 1965 while (humongous_chunks != NULL) {
jmasa@3761 1966 #ifdef ASSERT
jmasa@3761 1967 humongous_chunks->set_is_free(true);
jmasa@3761 1968 #endif
jmasa@3947 1969 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1970 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 1971 humongous_chunks,
jmasa@3947 1972 humongous_chunks->word_size());
jmasa@3947 1973 }
jmasa@3947 1974 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 1975 align_size_up(humongous_chunks->word_size(),
jmasa@3947 1976 HumongousChunkGranularity),
jmasa@3947 1977 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 1978 " granularity %d",
jmasa@3947 1979 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 1980 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@3761 1981 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 1982 humongous_chunks = next_humongous_chunks;
coleenp@3602 1983 }
jmasa@3947 1984 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1985 gclog_or_tty->print_cr("");
jmasa@3947 1986 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 1987 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 1988 chunk_size_name(HumongousIndex));
jmasa@3947 1989 }
jmasa@3761 1990 set_chunks_in_use(HumongousIndex, NULL);
mgerdin@3829 1991 chunk_manager->slow_locked_verify();
coleenp@3602 1992 }
coleenp@3602 1993
jmasa@3947 1994 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 1995 switch (index) {
jmasa@3947 1996 case SpecializedIndex:
jmasa@3947 1997 return "Specialized";
jmasa@3947 1998 case SmallIndex:
jmasa@3947 1999 return "Small";
jmasa@3947 2000 case MediumIndex:
jmasa@3947 2001 return "Medium";
jmasa@3947 2002 case HumongousIndex:
jmasa@3947 2003 return "Humongous";
jmasa@3947 2004 default:
jmasa@3947 2005 return NULL;
jmasa@3947 2006 }
jmasa@3947 2007 }
jmasa@3947 2008
jmasa@3947 2009 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2010 switch (size) {
jmasa@3947 2011 case SpecializedChunk:
jmasa@3947 2012 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2013 "Need branch for ClassSpecializedChunk");
jmasa@3947 2014 return SpecializedIndex;
jmasa@3947 2015 case SmallChunk:
jmasa@3947 2016 case ClassSmallChunk:
jmasa@3947 2017 return SmallIndex;
jmasa@3947 2018 case MediumChunk:
jmasa@3947 2019 case ClassMediumChunk:
jmasa@3947 2020 return MediumIndex;
jmasa@3947 2021 default:
jmasa@3948 2022 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2023 "Not a humongous chunk");
jmasa@3947 2024 return HumongousIndex;
jmasa@3947 2025 }
jmasa@3947 2026 }
jmasa@3947 2027
jmasa@3761 2028 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2029 assert_lock_strong(_lock);
jmasa@3761 2030 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2031 assert(word_size >= min_size,
jmasa@3761 2032 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2033 block_freelists()->return_block(p, word_size);
coleenp@3602 2034 }
coleenp@3602 2035
coleenp@3602 2036 // Adds a chunk to the list of chunks in use.
coleenp@3602 2037 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2038
coleenp@3602 2039 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2040 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2041
coleenp@3602 2042 new_chunk->reset_empty();
coleenp@3602 2043
coleenp@3602 2044 // Find the correct list and and set the current
coleenp@3602 2045 // chunk for that list.
jmasa@3947 2046 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2047
jmasa@3947 2048 if (index != HumongousIndex) {
coleenp@3602 2049 set_current_chunk(new_chunk);
jmasa@3947 2050 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2051 set_chunks_in_use(index, new_chunk);
jmasa@3947 2052 } else {
coleenp@3602 2053 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2054 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2055 // chunk.
coleenp@3602 2056 if (make_current) {
coleenp@3602 2057 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2058 set_current_chunk(new_chunk);
coleenp@3602 2059 }
coleenp@3602 2060 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2061 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2062 // any humongous chunks so will not point to the tail
coleenp@3602 2063 // of the humongous chunks list.
coleenp@3602 2064 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2065 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2066
jmasa@3948 2067 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2068 }
coleenp@3602 2069
coleenp@3602 2070 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2071 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2072 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2073 sum_count_in_chunks_in_use());
coleenp@3602 2074 new_chunk->print_on(gclog_or_tty);
coleenp@3602 2075 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
coleenp@3602 2076 }
coleenp@3602 2077 }
coleenp@3602 2078
jmasa@3947 2079 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2080 size_t grow_chunks_by_words) {
jmasa@3947 2081
jmasa@3947 2082 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2083 grow_chunks_by_words,
jmasa@3947 2084 medium_chunk_bunch());
jmasa@3947 2085
jmasa@3947 2086 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2087 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2088 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2089 next->word_size());
jmasa@3947 2090 }
jmasa@3947 2091
jmasa@3947 2092 return next;
jmasa@3947 2093 }
jmasa@3947 2094
coleenp@3602 2095 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2096 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2097
coleenp@3602 2098 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2099 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2100 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2101 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2102
jmasa@3761 2103 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2104
jmasa@3761 2105 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2106 Metablock::min_block_byte_size());
jmasa@3761 2107 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2108 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2109 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2110
coleenp@3602 2111 BlockFreelist* fl = block_freelists();
jmasa@3761 2112 MetaWord* p = NULL;
coleenp@3602 2113 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2114 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2115 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2116 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2117 // for allocations. Do some profiling. JJJ
jmasa@3761 2118 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2119 p = fl->get_block(raw_word_size);
coleenp@3602 2120 }
jmasa@3761 2121 if (p == NULL) {
jmasa@3761 2122 p = allocate_work(raw_word_size);
coleenp@3602 2123 }
coleenp@3602 2124 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2125
jmasa@3761 2126 return p;
coleenp@3602 2127 }
coleenp@3602 2128
coleenp@3602 2129 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2130 // This methods does not know about blocks (Metablocks)
jmasa@3761 2131 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2132 assert_lock_strong(_lock);
coleenp@3602 2133 #ifdef ASSERT
coleenp@3602 2134 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2135 return NULL;
coleenp@3602 2136 }
coleenp@3602 2137 #endif
coleenp@3602 2138 // Is there space in the current chunk?
jmasa@3761 2139 MetaWord* result = NULL;
coleenp@3602 2140
coleenp@3602 2141 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2142 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2143 // of memory if this returns null.
coleenp@3602 2144 if (DumpSharedSpaces) {
coleenp@3602 2145 assert(current_chunk() != NULL, "should never happen");
coleenp@3602 2146 inc_allocation_total(word_size);
coleenp@3602 2147 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2148 }
coleenp@3602 2149 if (current_chunk() != NULL) {
coleenp@3602 2150 result = current_chunk()->allocate(word_size);
coleenp@3602 2151 }
coleenp@3602 2152
coleenp@3602 2153 if (result == NULL) {
coleenp@3602 2154 result = grow_and_allocate(word_size);
coleenp@3602 2155 }
coleenp@3602 2156 if (result > 0) {
coleenp@3602 2157 inc_allocation_total(word_size);
jmasa@3761 2158 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2159 "Head of the list is being allocated");
coleenp@3602 2160 }
coleenp@3602 2161
coleenp@3602 2162 return result;
coleenp@3602 2163 }
coleenp@3602 2164
coleenp@3602 2165 void SpaceManager::verify() {
coleenp@3602 2166 // If there are blocks in the dictionary, then
coleenp@3602 2167 // verfication of chunks does not work since
coleenp@3602 2168 // being in the dictionary alters a chunk.
jmasa@3761 2169 if (block_freelists()->total_size() == 0) {
jmasa@3947 2170 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2171 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2172 while (curr != NULL) {
coleenp@3602 2173 curr->verify();
jmasa@3892 2174 verify_chunk_size(curr);
coleenp@3602 2175 curr = curr->next();
coleenp@3602 2176 }
coleenp@3602 2177 }
coleenp@3602 2178 }
coleenp@3602 2179 }
coleenp@3602 2180
jmasa@3892 2181 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2182 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2183 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2184 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2185 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2186 "Chunk size is wrong");
jmasa@3892 2187 return;
jmasa@3892 2188 }
jmasa@3892 2189
coleenp@3602 2190 #ifdef ASSERT
coleenp@3602 2191 void SpaceManager::verify_allocation_total() {
coleenp@3602 2192 // Verification is only guaranteed at a safepoint.
coleenp@3602 2193 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2194 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT
coleenp@3602 2195 " sum_used_in_chunks_in_use " SIZE_FORMAT,
coleenp@3602 2196 this,
coleenp@3602 2197 allocation_total(),
coleenp@3602 2198 sum_used_in_chunks_in_use());
coleenp@3602 2199 }
coleenp@3602 2200 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2201 assert(allocation_total() == sum_used_in_chunks_in_use(),
mikael@4113 2202 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2203 " vs " SIZE_FORMAT,
coleenp@3602 2204 allocation_total(), sum_used_in_chunks_in_use()));
coleenp@3602 2205 }
coleenp@3602 2206
coleenp@3602 2207 #endif
coleenp@3602 2208
coleenp@3602 2209 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2210 size_t curr_total = 0;
coleenp@3602 2211 size_t waste = 0;
coleenp@3602 2212 uint i = 0;
coleenp@3602 2213 size_t used = 0;
coleenp@3602 2214 size_t capacity = 0;
coleenp@3602 2215
coleenp@3602 2216 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2217 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2218 index < NumberOfInUseLists;
coleenp@3602 2219 index = next_chunk_index(index)) {
coleenp@3602 2220 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2221 curr != NULL;
coleenp@3602 2222 curr = curr->next()) {
coleenp@3602 2223 out->print("%d) ", i++);
coleenp@3602 2224 curr->print_on(out);
coleenp@3602 2225 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2226 block_freelists()->print_on(out);
coleenp@3602 2227 }
coleenp@3602 2228 curr_total += curr->word_size();
coleenp@3602 2229 used += curr->used_word_size();
coleenp@3602 2230 capacity += curr->capacity_word_size();
coleenp@3602 2231 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2232 }
coleenp@3602 2233 }
coleenp@3602 2234
jmasa@3947 2235 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2236 // Free space isn't wasted.
coleenp@3602 2237 waste -= free;
coleenp@3602 2238
coleenp@3602 2239 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2240 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2241 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2242 }
coleenp@3602 2243
coleenp@3869 2244 #ifndef PRODUCT
coleenp@3602 2245 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2246 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2247 index < NumberOfInUseLists;
coleenp@3602 2248 index = next_chunk_index(index)) {
coleenp@3602 2249 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2250 curr != NULL;
coleenp@3602 2251 curr = curr->next()) {
coleenp@3602 2252 curr->mangle();
coleenp@3602 2253 }
coleenp@3602 2254 }
coleenp@3602 2255 }
coleenp@3869 2256 #endif // PRODUCT
coleenp@3602 2257
coleenp@3602 2258 // MetaspaceAux
coleenp@3602 2259
jmasa@3611 2260 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) {
jmasa@3607 2261 size_t used = 0;
jmasa@3607 2262 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2263 while (iter.repeat()) {
jmasa@3607 2264 Metaspace* msp = iter.get_next();
jmasa@3607 2265 // Sum allocation_total for each metaspace
jmasa@3607 2266 if (msp != NULL) {
jmasa@3607 2267 used += msp->used_words(mdtype);
jmasa@3607 2268 }
jmasa@3607 2269 }
jmasa@3607 2270 return used * BytesPerWord;
jmasa@3607 2271 }
jmasa@3607 2272
coleenp@3602 2273 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2274 size_t free = 0;
coleenp@3602 2275 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2276 while (iter.repeat()) {
coleenp@3602 2277 Metaspace* msp = iter.get_next();
coleenp@3602 2278 if (msp != NULL) {
coleenp@3602 2279 free += msp->free_words(mdtype);
coleenp@3602 2280 }
coleenp@3602 2281 }
coleenp@3602 2282 return free * BytesPerWord;
coleenp@3602 2283 }
coleenp@3602 2284
coleenp@3602 2285 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2286 size_t capacity = free_chunks_total(mdtype);
coleenp@3602 2287 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2288 while (iter.repeat()) {
coleenp@3602 2289 Metaspace* msp = iter.get_next();
coleenp@3602 2290 if (msp != NULL) {
coleenp@3602 2291 capacity += msp->capacity_words(mdtype);
coleenp@3602 2292 }
coleenp@3602 2293 }
coleenp@3602 2294 return capacity * BytesPerWord;
coleenp@3602 2295 }
coleenp@3602 2296
coleenp@3602 2297 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2298 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2299 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2300 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2301 return reserved * BytesPerWord;
coleenp@3602 2302 }
coleenp@3602 2303
jmasa@3947 2304 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
coleenp@3602 2305
coleenp@3602 2306 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2307 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2308 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2309 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2310 chunk->slow_verify();
coleenp@3602 2311 return chunk->free_chunks_total();
coleenp@3602 2312 }
coleenp@3602 2313
coleenp@3602 2314 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2315 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2316 }
coleenp@3602 2317
coleenp@3602 2318 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2319 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2320 if (PrintGCDetails && Verbose) {
coleenp@3602 2321 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2322 "->" SIZE_FORMAT
coleenp@3602 2323 "(" SIZE_FORMAT "/" SIZE_FORMAT ")",
coleenp@3602 2324 prev_metadata_used,
coleenp@3602 2325 used_in_bytes(),
coleenp@3602 2326 capacity_in_bytes(),
coleenp@3602 2327 reserved_in_bytes());
coleenp@3602 2328 } else {
coleenp@3602 2329 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2330 "->" SIZE_FORMAT "K"
coleenp@3602 2331 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)",
coleenp@3602 2332 prev_metadata_used / K,
coleenp@3602 2333 used_in_bytes()/ K,
coleenp@3602 2334 capacity_in_bytes()/K,
coleenp@3602 2335 reserved_in_bytes()/ K);
coleenp@3602 2336 }
coleenp@3602 2337
coleenp@3602 2338 gclog_or_tty->print("]");
coleenp@3602 2339 }
coleenp@3602 2340
coleenp@3602 2341 // This is printed when PrintGCDetails
coleenp@3602 2342 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2343 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2344 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2345
coleenp@3602 2346 out->print_cr(" Metaspace total "
coleenp@3602 2347 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2348 " reserved " SIZE_FORMAT "K",
jmasa@3611 2349 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K);
coleenp@3602 2350 out->print_cr(" data space "
coleenp@3602 2351 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2352 " reserved " SIZE_FORMAT "K",
jmasa@3611 2353 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K);
coleenp@3602 2354 out->print_cr(" class space "
coleenp@3602 2355 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2356 " reserved " SIZE_FORMAT "K",
jmasa@3611 2357 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K);
coleenp@3602 2358 }
coleenp@3602 2359
coleenp@3602 2360 // Print information for class space and data space separately.
coleenp@3602 2361 // This is almost the same as above.
coleenp@3602 2362 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2363 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
coleenp@3602 2364 size_t capacity_bytes = capacity_in_bytes(mdtype);
coleenp@3602 2365 size_t used_bytes = used_in_bytes(mdtype);
coleenp@3602 2366 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2367 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2368 free_chunks_capacity_bytes;
coleenp@3602 2369 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2370 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2371 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2372 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2373 used_bytes / K,
coleenp@3602 2374 free_bytes / K,
coleenp@3602 2375 free_chunks_capacity_bytes / K,
coleenp@3602 2376 used_and_free / K,
coleenp@3602 2377 capacity_bytes / K);
mgerdin@4303 2378 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2379 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2380 }
coleenp@3602 2381
coleenp@3602 2382 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2383 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2384
jmasa@3947 2385 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0;
jmasa@3947 2386 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0;
jmasa@3947 2387 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
jmasa@3947 2388 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0;
coleenp@3602 2389
coleenp@3602 2390 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2391 while (iter.repeat()) {
coleenp@3602 2392 Metaspace* msp = iter.get_next();
coleenp@3602 2393 if (msp != NULL) {
jmasa@3947 2394 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2395 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2396 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2397 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2398 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2399 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2400 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2401 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
jmasa@3947 2402
jmasa@3947 2403 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2404 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2405 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2406 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2407 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2408 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2409 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2410 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2411 }
coleenp@3602 2412 }
coleenp@3602 2413 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2414 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2415 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
jmasa@3947 2416 SIZE_FORMAT " medium(s) " SIZE_FORMAT,
jmasa@3947 2417 specialized_count, specialized_waste, small_count,
jmasa@3947 2418 small_waste, medium_count, medium_waste);
jmasa@3947 2419 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2420 SIZE_FORMAT " small(s) " SIZE_FORMAT,
jmasa@3947 2421 cls_specialized_count, cls_specialized_waste,
jmasa@3947 2422 cls_small_count, cls_small_waste);
coleenp@3602 2423 }
coleenp@3602 2424
coleenp@3602 2425 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2426 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2427 out->print_cr("All Metaspace:");
coleenp@3602 2428 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2429 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2430 print_waste(out);
coleenp@3602 2431 }
coleenp@3602 2432
mgerdin@3829 2433 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2434 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2435 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2436 }
mgerdin@3829 2437
coleenp@3602 2438 // Metaspace methods
coleenp@3602 2439
coleenp@3602 2440 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2441 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2442
jmasa@3947 2443 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2444 initialize(lock, type);
coleenp@3602 2445 }
coleenp@3602 2446
coleenp@3602 2447 Metaspace::~Metaspace() {
coleenp@3602 2448 delete _vsm;
coleenp@3602 2449 delete _class_vsm;
coleenp@3602 2450 }
coleenp@3602 2451
coleenp@3602 2452 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2453 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2454
coleenp@3602 2455 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2456
coleenp@3602 2457 void Metaspace::global_initialize() {
coleenp@3602 2458 // Initialize the alignment for shared spaces.
coleenp@3602 2459 int max_alignment = os::vm_page_size();
coleenp@3602 2460 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2461
coleenp@3602 2462 if (DumpSharedSpaces) {
coleenp@3602 2463 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2464 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2465 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2466 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2467
coleenp@3602 2468 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2469 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2470 // remainder is the misc code and data chunks.
coleenp@3602 2471 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2472 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2473 os::vm_allocation_granularity());
coleenp@3602 2474 size_t word_size = total/wordSize;
coleenp@3602 2475 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2476 } else {
coleenp@3602 2477 // If using shared space, open the file that contains the shared space
coleenp@3602 2478 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2479 // the addresses don't conflict)
coleenp@3602 2480 if (UseSharedSpaces) {
coleenp@3602 2481 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2482 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2483
coleenp@3602 2484 // Open the shared archive file, read and validate the header. If
coleenp@3602 2485 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2486 // disabled and the file is closed.
coleenp@3602 2487 // Map in spaces now also
coleenp@3602 2488 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2489 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2490 } else {
coleenp@3602 2491 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2492 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2493 }
coleenp@3602 2494 }
coleenp@3602 2495
jmasa@3947 2496 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 2497 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 2498 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 2499 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 2500 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 2501 // from there. This size calculated by -version.
jmasa@3947 2502 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
jmasa@3947 2503 (ClassMetaspaceSize/BytesPerWord)*2);
jmasa@3947 2504 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 2505 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2506 // of the boot class loader size.
jmasa@3947 2507 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 2508 // Initialize the list of virtual spaces.
coleenp@3602 2509 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2510 }
coleenp@3602 2511 }
coleenp@3602 2512
coleenp@3602 2513 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2514 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2515 // argument passed in is at the top of the compressed space
coleenp@3602 2516 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2517 // The reserved space size may be bigger because of alignment, esp with UseLargePages
mikael@4113 2518 assert(rs.size() >= ClassMetaspaceSize,
mikael@4113 2519 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize));
coleenp@3602 2520 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2521 }
coleenp@3602 2522
jmasa@3947 2523 void Metaspace::initialize(Mutex* lock,
jmasa@3947 2524 MetaspaceType type) {
coleenp@3602 2525
coleenp@3602 2526 assert(space_list() != NULL,
coleenp@3602 2527 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2528
coleenp@3602 2529 _vsm = new SpaceManager(lock, space_list());
coleenp@3602 2530 if (_vsm == NULL) {
coleenp@3602 2531 return;
coleenp@3602 2532 }
jmasa@3947 2533 size_t word_size;
jmasa@3947 2534 size_t class_word_size;
jmasa@3947 2535 vsm()->get_initial_chunk_sizes(type,
jmasa@3947 2536 &word_size,
jmasa@3947 2537 &class_word_size);
coleenp@3602 2538
coleenp@3602 2539 assert(class_space_list() != NULL,
coleenp@3602 2540 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2541
coleenp@3602 2542 // Allocate SpaceManager for classes.
coleenp@3602 2543 _class_vsm = new SpaceManager(lock, class_space_list());
coleenp@3602 2544 if (_class_vsm == NULL) {
coleenp@3602 2545 return;
coleenp@3602 2546 }
coleenp@3602 2547
coleenp@3602 2548 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2549
coleenp@3602 2550 // Allocate chunk for metadata objects
coleenp@3602 2551 Metachunk* new_chunk =
jmasa@3947 2552 space_list()->get_initialization_chunk(word_size,
jmasa@3947 2553 vsm()->medium_chunk_bunch());
coleenp@3602 2554 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2555 if (new_chunk != NULL) {
coleenp@3602 2556 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2557 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2558 }
coleenp@3602 2559
coleenp@3602 2560 // Allocate chunk for class metadata objects
coleenp@3602 2561 Metachunk* class_chunk =
jmasa@3947 2562 class_space_list()->get_initialization_chunk(class_word_size,
jmasa@3947 2563 class_vsm()->medium_chunk_bunch());
coleenp@3602 2564 if (class_chunk != NULL) {
coleenp@3602 2565 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2566 }
coleenp@3602 2567 }
coleenp@3602 2568
jmasa@3947 2569 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 2570 size_t byte_size = word_size * wordSize;
jmasa@3947 2571 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@3947 2572 }
jmasa@3947 2573
coleenp@3602 2574 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2575 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2576 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2577 return class_vsm()->allocate(word_size);
coleenp@3602 2578 } else {
jmasa@3761 2579 return vsm()->allocate(word_size);
coleenp@3602 2580 }
coleenp@3602 2581 }
coleenp@3602 2582
jmasa@3629 2583 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2584 MetaWord* result;
jmasa@3629 2585 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2586 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@3629 2587 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size);
jmasa@3629 2588 MetaspaceGC::inc_capacity_until_GC(delta_words);
jmasa@3629 2589 if (PrintGCDetails && Verbose) {
jmasa@3629 2590 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2591 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2592 }
jmasa@3761 2593
jmasa@3629 2594 result = allocate(word_size, mdtype);
jmasa@3629 2595
jmasa@3629 2596 return result;
jmasa@3629 2597 }
jmasa@3629 2598
coleenp@3602 2599 // Space allocated in the Metaspace. This may
coleenp@3602 2600 // be across several metadata virtual spaces.
coleenp@3602 2601 char* Metaspace::bottom() const {
coleenp@3602 2602 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2603 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2604 }
coleenp@3602 2605
coleenp@3602 2606 size_t Metaspace::used_words(MetadataType mdtype) const {
coleenp@3602 2607 // return vsm()->allocation_total();
coleenp@3602 2608 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2609 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2610 }
coleenp@3602 2611
coleenp@3602 2612 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2613 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2614 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2615 }
coleenp@3602 2616
coleenp@3602 2617 // Space capacity in the Metaspace. It includes
coleenp@3602 2618 // space in the list of chunks from which allocations
coleenp@3602 2619 // have been made. Don't include space in the global freelist and
coleenp@3602 2620 // in the space available in the dictionary which
coleenp@3602 2621 // is already counted in some chunk.
coleenp@3602 2622 size_t Metaspace::capacity_words(MetadataType mdtype) const {
coleenp@3602 2623 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2624 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2625 }
coleenp@3602 2626
coleenp@3602 2627 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2628 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2629 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2630 // Don't take Heap_lock
jmasa@3761 2631 MutexLocker ml(vsm()->lock());
jmasa@3761 2632 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2633 // Dark matter. Too small for dictionary.
jmasa@3761 2634 #ifdef ASSERT
jmasa@3761 2635 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2636 #endif
jmasa@3761 2637 return;
jmasa@3761 2638 }
coleenp@3602 2639 if (is_class) {
jmasa@3761 2640 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2641 } else {
jmasa@3761 2642 vsm()->deallocate(ptr, word_size);
coleenp@3602 2643 }
coleenp@3602 2644 } else {
coleenp@3602 2645 MutexLocker ml(vsm()->lock());
coleenp@3602 2646
jmasa@3761 2647 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2648 // Dark matter. Too small for dictionary.
jmasa@3761 2649 #ifdef ASSERT
jmasa@3761 2650 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2651 #endif
jmasa@3761 2652 return;
jmasa@3761 2653 }
coleenp@3602 2654 if (is_class) {
jmasa@3761 2655 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2656 } else {
jmasa@3761 2657 vsm()->deallocate(ptr, word_size);
coleenp@3602 2658 }
coleenp@3602 2659 }
coleenp@3602 2660 }
coleenp@3602 2661
jmasa@3761 2662 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 2663 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 2664 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 2665 assert(false, "Should not allocate with exception pending");
coleenp@3602 2666 return NULL; // caller does a CHECK_NULL too
coleenp@3602 2667 }
coleenp@3602 2668
coleenp@3602 2669 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 2670 MetaWord* result = NULL;
coleenp@3602 2671
coleenp@3602 2672 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 2673 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 2674 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 2675 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 2676 // to revisit this for application class data sharing.
coleenp@3602 2677 if (DumpSharedSpaces) {
coleenp@3602 2678 if (read_only) {
coleenp@3602 2679 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2680 } else {
coleenp@3602 2681 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2682 }
coleenp@3602 2683 if (result == NULL) {
coleenp@3602 2684 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 2685 }
jmasa@3761 2686 return Metablock::initialize(result, word_size);
coleenp@3602 2687 }
coleenp@3602 2688
coleenp@3602 2689 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 2690
coleenp@3602 2691 if (result == NULL) {
coleenp@3602 2692 // Try to clean out some memory and retry.
coleenp@3602 2693 result =
jmasa@3761 2694 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 2695 loader_data, word_size, mdtype);
coleenp@3602 2696
coleenp@3602 2697 // If result is still null, we are out of memory.
coleenp@3602 2698 if (result == NULL) {
jmasa@3947 2699 if (Verbose && TraceMetadataChunkAllocation) {
jmasa@3947 2700 gclog_or_tty->print_cr("Metaspace allocation failed for size "
jmasa@3947 2701 SIZE_FORMAT, word_size);
jmasa@3947 2702 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty);
jmasa@3947 2703 MetaspaceAux::dump(gclog_or_tty);
jmasa@3947 2704 }
coleenp@3602 2705 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 2706 report_java_out_of_memory("Metadata space");
coleenp@3602 2707
coleenp@3602 2708 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 2709 JvmtiExport::post_resource_exhausted(
coleenp@3602 2710 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 2711 "Metadata space");
coleenp@3602 2712 }
coleenp@3602 2713 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 2714 }
coleenp@3602 2715 }
jmasa@3761 2716 return Metablock::initialize(result, word_size);
coleenp@3602 2717 }
coleenp@3602 2718
coleenp@3602 2719 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 2720 // Print both class virtual space counts and metaspace.
coleenp@3602 2721 if (Verbose) {
coleenp@3602 2722 vsm()->print_on(out);
coleenp@3602 2723 class_vsm()->print_on(out);
coleenp@3602 2724 }
coleenp@3602 2725 }
coleenp@3602 2726
coleenp@3860 2727 bool Metaspace::contains(const void * ptr) {
coleenp@3602 2728 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 2729 return true;
coleenp@3602 2730 }
coleenp@3860 2731 // This is checked while unlocked. As long as the virtualspaces are added
coleenp@3860 2732 // at the end, the pointer will be in one of them. The virtual spaces
coleenp@3860 2733 // aren't deleted presently. When they are, some sort of locking might
coleenp@3860 2734 // be needed. Note, locking this can cause inversion problems with the
coleenp@3860 2735 // caller in MetaspaceObj::is_metadata() function.
coleenp@3602 2736 return space_list()->contains(ptr) || class_space_list()->contains(ptr);
coleenp@3602 2737 }
coleenp@3602 2738
coleenp@3602 2739 void Metaspace::verify() {
coleenp@3602 2740 vsm()->verify();
coleenp@3602 2741 class_vsm()->verify();
coleenp@3602 2742 }
coleenp@3602 2743
coleenp@3602 2744 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 2745 if (UseMallocOnly) {
coleenp@3602 2746 // Just print usage for now
coleenp@3602 2747 out->print_cr("usage %d", used_words(Metaspace::NonClassType));
coleenp@3602 2748 }
coleenp@3602 2749 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 2750 vsm()->dump(out);
coleenp@3602 2751 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 2752 class_vsm()->dump(out);
coleenp@3602 2753 }