annotate src/share/vm/memory/metaspace.cpp @ 4580:868d87ed63c8

8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions Reviewed-by: mgerdin, coleenp
author jmasa
date Tue, 12 Feb 2013 14:15:45 -0800
parents c23dbf0e8ab7
children 601183f604b2
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 // Parameters for stress mode testing
coleenp@3602 51 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 52 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 53 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 54
coleenp@3602 55 MetaWord* last_allocated = 0;
coleenp@3602 56
coleenp@3602 57 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 58 enum ChunkIndex {
jmasa@3947 59 ZeroIndex = 0,
jmasa@3947 60 SpecializedIndex = ZeroIndex,
jmasa@3947 61 SmallIndex = SpecializedIndex + 1,
jmasa@3947 62 MediumIndex = SmallIndex + 1,
jmasa@3947 63 HumongousIndex = MediumIndex + 1,
jmasa@3947 64 NumberOfFreeLists = 3,
jmasa@3947 65 NumberOfInUseLists = 4
jmasa@3947 66 };
jmasa@3947 67
jmasa@3947 68 enum ChunkSizes { // in words.
jmasa@3947 69 ClassSpecializedChunk = 128,
jmasa@3947 70 SpecializedChunk = 128,
jmasa@3947 71 ClassSmallChunk = 256,
jmasa@3947 72 SmallChunk = 512,
jmasa@3947 73 ClassMediumChunk = 1 * K,
jmasa@3947 74 MediumChunk = 8 * K,
jmasa@3947 75 HumongousChunkGranularity = 8
coleenp@3602 76 };
coleenp@3602 77
coleenp@3602 78 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 79 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 80 return (ChunkIndex) (i+1);
coleenp@3602 81 }
coleenp@3602 82
coleenp@3602 83 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 84 // the default MetaspaceSize before argument processing was being
coleenp@3602 85 // used which was not the desired value. See the code
coleenp@3602 86 // in should_expand() to see how the initialization is handled
coleenp@3602 87 // now.
coleenp@3602 88 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 89 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 90 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 91 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 92
coleenp@3602 93 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 94 //
coleenp@3602 95 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 96 // allocated there is no explicit link between a Metachunk and
coleenp@3602 97 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 98 //
coleenp@3602 99 // Each SpaceManager maintains a
coleenp@3602 100 // list of the chunks it is using and the current chunk. The current
coleenp@3602 101 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 102 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 103 // reused from there.
coleenp@3602 104
jmasa@4497 105 typedef class FreeList<Metachunk> ChunkList;
coleenp@3602 106
coleenp@3602 107 // Manages the global free lists of chunks.
coleenp@3602 108 // Has three lists of free chunks, and a total size and
coleenp@3602 109 // count that includes all three
coleenp@3602 110
coleenp@3602 111 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 112
coleenp@3602 113 // Free list of chunks of different sizes.
jmasa@4572 114 // SpecializedChunk
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@4572 168 // Remove the chunk from its freelist. It is
jmasa@4572 169 // expected to be on one of the _free_chunks[] lists.
jmasa@4572 170 void remove_chunk(Metachunk* chunk);
jmasa@4572 171
jmasa@4497 172 // Add the simple linked list of chunks to the freelist of chunks
jmasa@4497 173 // of type index.
jmasa@4497 174 void return_chunks(ChunkIndex index, Metachunk* chunks);
jmasa@4497 175
coleenp@3602 176 // Total of the space in the free chunks list
coleenp@3602 177 size_t free_chunks_total();
coleenp@3602 178 size_t free_chunks_total_in_bytes();
coleenp@3602 179
coleenp@3602 180 // Number of chunks in the free chunks list
coleenp@3602 181 size_t free_chunks_count();
coleenp@3602 182
coleenp@3602 183 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 184 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 185 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 186 }
jmasa@3761 187 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 188 return &_humongous_dictionary;
jmasa@3761 189 }
coleenp@3602 190
coleenp@3602 191 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 192
coleenp@3602 193 // Returns the list for the given chunk word size.
coleenp@3602 194 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 195
coleenp@3602 196 // Add and remove from a list by size. Selects
coleenp@3602 197 // list based on size of chunk.
coleenp@3602 198 void free_chunks_put(Metachunk* chuck);
coleenp@3602 199 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 200
coleenp@3602 201 // Debug support
coleenp@3602 202 void verify();
mgerdin@3829 203 void slow_verify() {
mgerdin@3829 204 if (metaspace_slow_verify) {
mgerdin@3829 205 verify();
mgerdin@3829 206 }
mgerdin@3829 207 }
coleenp@3602 208 void locked_verify();
mgerdin@3829 209 void slow_locked_verify() {
mgerdin@3829 210 if (metaspace_slow_verify) {
mgerdin@3829 211 locked_verify();
mgerdin@3829 212 }
mgerdin@3829 213 }
coleenp@3602 214 void verify_free_chunks_total();
coleenp@3602 215
coleenp@3602 216 void locked_print_free_chunks(outputStream* st);
coleenp@3602 217 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 218
jmasa@3761 219 void print_on(outputStream* st);
coleenp@3602 220 };
coleenp@3602 221
coleenp@3602 222 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 223 // to the allocation of a quantum of metadata).
coleenp@3602 224 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 225 BlockTreeDictionary* _dictionary;
jmasa@3761 226 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 227
coleenp@3602 228 // Accessors
jmasa@3761 229 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 230
coleenp@3602 231 public:
coleenp@3602 232 BlockFreelist();
coleenp@3602 233 ~BlockFreelist();
coleenp@3602 234
coleenp@3602 235 // Get and return a block to the free list
jmasa@3761 236 MetaWord* get_block(size_t word_size);
jmasa@3761 237 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 238
jmasa@3761 239 size_t total_size() {
jmasa@3761 240 if (dictionary() == NULL) {
coleenp@3602 241 return 0;
jmasa@3761 242 } else {
jmasa@3761 243 return dictionary()->total_size();
coleenp@3602 244 }
jmasa@3761 245 }
coleenp@3602 246
coleenp@3602 247 void print_on(outputStream* st) const;
coleenp@3602 248 };
coleenp@3602 249
coleenp@3602 250 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 251 friend class VirtualSpaceList;
coleenp@3602 252
coleenp@3602 253 // Link to next VirtualSpaceNode
coleenp@3602 254 VirtualSpaceNode* _next;
coleenp@3602 255
coleenp@3602 256 // total in the VirtualSpace
coleenp@3602 257 MemRegion _reserved;
coleenp@3602 258 ReservedSpace _rs;
coleenp@3602 259 VirtualSpace _virtual_space;
coleenp@3602 260 MetaWord* _top;
jmasa@4572 261 // count of chunks contained in this VirtualSpace
jmasa@4572 262 uintx _container_count;
coleenp@3602 263
coleenp@3602 264 // Convenience functions for logical bottom and end
coleenp@3602 265 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 266 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 267
coleenp@3602 268 // Convenience functions to access the _virtual_space
coleenp@3602 269 char* low() const { return virtual_space()->low(); }
coleenp@3602 270 char* high() const { return virtual_space()->high(); }
coleenp@3602 271
jmasa@4572 272 // The first Metachunk will be allocated at the bottom of the
jmasa@4572 273 // VirtualSpace
jmasa@4572 274 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
jmasa@4572 275
jmasa@4572 276 void inc_container_count();
jmasa@4572 277 #ifdef ASSERT
jmasa@4572 278 uint container_count_slow();
jmasa@4572 279 #endif
jmasa@4572 280
coleenp@3602 281 public:
coleenp@3602 282
coleenp@3602 283 VirtualSpaceNode(size_t byte_size);
jmasa@4572 284 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
coleenp@3602 285 ~VirtualSpaceNode();
coleenp@3602 286
coleenp@3602 287 // address of next available space in _virtual_space;
coleenp@3602 288 // Accessors
coleenp@3602 289 VirtualSpaceNode* next() { return _next; }
coleenp@3602 290 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 291
coleenp@3602 292 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 293 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 294
coleenp@3602 295 // Accessors
coleenp@3602 296 MemRegion* reserved() { return &_reserved; }
coleenp@3602 297 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 298
jmasa@4580 299 // Returns true if "word_size" is available in the VirtualSpace
coleenp@3602 300 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 301
coleenp@3602 302 MetaWord* top() const { return _top; }
coleenp@3602 303 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 304
jmasa@4572 305 uintx container_count() { return _container_count; }
jmasa@4572 306 void dec_container_count();
jmasa@4572 307 #ifdef ASSERT
jmasa@4572 308 void verify_container_count();
jmasa@4572 309 #endif
jmasa@4572 310
coleenp@3602 311 // used and capacity in this single entry in the list
coleenp@3602 312 size_t used_words_in_vs() const;
coleenp@3602 313 size_t capacity_words_in_vs() const;
jmasa@4580 314 size_t free_words_in_vs() const;
coleenp@3602 315
coleenp@3602 316 bool initialize();
coleenp@3602 317
coleenp@3602 318 // get space from the virtual space
coleenp@3602 319 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 320
coleenp@3602 321 // Allocate a chunk from the virtual space and return it.
coleenp@3602 322 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 323 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 324
coleenp@3602 325 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 326 // to Virtualspace
coleenp@3602 327 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 328 bool shrink_by(size_t words);
coleenp@3602 329
jmasa@4572 330 // In preparation for deleting this node, remove all the chunks
jmasa@4572 331 // in the node from any freelist.
jmasa@4572 332 void purge(ChunkManager* chunk_manager);
jmasa@4572 333
coleenp@3869 334 #ifdef ASSERT
coleenp@3602 335 // Debug support
coleenp@3602 336 static void verify_virtual_space_total();
coleenp@3602 337 static void verify_virtual_space_count();
coleenp@3602 338 void mangle();
coleenp@3869 339 #endif
coleenp@3602 340
coleenp@3602 341 void print_on(outputStream* st) const;
coleenp@3602 342 };
coleenp@3602 343
coleenp@3602 344 // byte_size is the size of the associated virtualspace.
jmasa@4572 345 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0), _container_count(0) {
zgu@4317 346 // align up to vm allocation granularity
zgu@4317 347 byte_size = align_size_up(byte_size, os::vm_allocation_granularity());
zgu@4317 348
coleenp@4369 349 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
coleenp@4369 350 // configurable address, generally at the top of the Java heap so other
coleenp@4369 351 // memory addresses don't conflict.
coleenp@3602 352 if (DumpSharedSpaces) {
coleenp@4369 353 char* shared_base = (char*)SharedBaseAddress;
coleenp@3602 354 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 355 if (_rs.is_reserved()) {
coleenp@4369 356 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
coleenp@3602 357 } else {
coleenp@4369 358 // Get a mmap region anywhere if the SharedBaseAddress fails.
coleenp@3602 359 _rs = ReservedSpace(byte_size);
coleenp@3602 360 }
coleenp@3602 361 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 362 } else {
coleenp@3602 363 _rs = ReservedSpace(byte_size);
coleenp@3602 364 }
coleenp@3602 365
coleenp@3602 366 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 367 }
coleenp@3602 368
jmasa@4572 369 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
jmasa@4572 370 Metachunk* chunk = first_chunk();
jmasa@4572 371 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 372 while (chunk < invalid_chunk ) {
jmasa@4572 373 assert(chunk->is_free(), "Should be marked free");
jmasa@4572 374 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 375 chunk_manager->remove_chunk(chunk);
jmasa@4572 376 assert(chunk->next() == NULL &&
jmasa@4572 377 chunk->prev() == NULL,
jmasa@4572 378 "Was not removed from its list");
jmasa@4572 379 chunk = (Metachunk*) next;
jmasa@4572 380 }
jmasa@4572 381 }
jmasa@4572 382
jmasa@4572 383 #ifdef ASSERT
jmasa@4572 384 uint VirtualSpaceNode::container_count_slow() {
jmasa@4572 385 uint count = 0;
jmasa@4572 386 Metachunk* chunk = first_chunk();
jmasa@4572 387 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 388 while (chunk < invalid_chunk ) {
jmasa@4572 389 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 390 // Don't count the chunks on the free lists. Those are
jmasa@4572 391 // still part of the VirtualSpaceNode but not currently
jmasa@4572 392 // counted.
jmasa@4572 393 if (!chunk->is_free()) {
jmasa@4572 394 count++;
jmasa@4572 395 }
jmasa@4572 396 chunk = (Metachunk*) next;
jmasa@4572 397 }
jmasa@4572 398 return count;
jmasa@4572 399 }
jmasa@4572 400 #endif
jmasa@4572 401
coleenp@3602 402 // List of VirtualSpaces for metadata allocation.
coleenp@3602 403 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 404 // for total space in the VirtualSpace.
coleenp@3602 405 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 406 friend class VirtualSpaceNode;
coleenp@3602 407
coleenp@3602 408 enum VirtualSpaceSizes {
coleenp@3602 409 VirtualSpaceSize = 256 * K
coleenp@3602 410 };
coleenp@3602 411
coleenp@3602 412 // Global list of virtual spaces
coleenp@3602 413 // Head of the list
coleenp@3602 414 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 415 // virtual space currently being used for allocations
coleenp@3602 416 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 417 // Free chunk list for all other metadata
coleenp@3602 418 ChunkManager _chunk_manager;
coleenp@3602 419
coleenp@3602 420 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 421 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 422 bool _is_class;
coleenp@3602 423 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 424
coleenp@3602 425 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 426 size_t _virtual_space_total;
coleenp@3602 427 size_t _virtual_space_count;
coleenp@3602 428
coleenp@3602 429 ~VirtualSpaceList();
coleenp@3602 430
coleenp@3602 431 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 432
coleenp@3602 433 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 434 _virtual_space_list = v;
coleenp@3602 435 }
coleenp@3602 436 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 437 _current_virtual_space = v;
coleenp@3602 438 }
coleenp@3602 439
coleenp@3602 440 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 441
coleenp@3602 442 // Get another virtual space and add it to the list. This
coleenp@3602 443 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 444 // and is typically followed by the allocation of a chunk.
coleenp@3602 445 bool grow_vs(size_t vs_word_size);
coleenp@3602 446
coleenp@3602 447 public:
coleenp@3602 448 VirtualSpaceList(size_t word_size);
coleenp@3602 449 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 450
jmasa@4580 451 size_t free_bytes();
jmasa@4580 452
jmasa@3947 453 Metachunk* get_new_chunk(size_t word_size,
jmasa@3947 454 size_t grow_chunks_by_words,
jmasa@3947 455 size_t medium_chunk_bunch);
jmasa@3947 456
jmasa@3947 457 // Get the first chunk for a Metaspace. Used for
jmasa@3947 458 // special cases such as the boot class loader, reflection
jmasa@3947 459 // class loader and anonymous class loader.
jmasa@3947 460 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch);
coleenp@3602 461
coleenp@3602 462 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 463 return _current_virtual_space;
coleenp@3602 464 }
coleenp@3602 465
coleenp@3602 466 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 467 bool is_class() const { return _is_class; }
coleenp@3602 468
coleenp@3602 469 // Allocate the first virtualspace.
coleenp@3602 470 void initialize(size_t word_size);
coleenp@3602 471
coleenp@3602 472 size_t virtual_space_total() { return _virtual_space_total; }
jmasa@4572 473
jmasa@4572 474 void inc_virtual_space_total(size_t v);
jmasa@4572 475 void dec_virtual_space_total(size_t v);
jmasa@4572 476 void inc_virtual_space_count();
jmasa@4572 477 void dec_virtual_space_count();
jmasa@4572 478
jmasa@4572 479 // Unlink empty VirtualSpaceNodes and free it.
jmasa@4572 480 void purge();
coleenp@3602 481
coleenp@3602 482 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 483 // These are global values shared by all Metaspaces
coleenp@3602 484 size_t capacity_words_sum();
coleenp@3602 485 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 486 size_t used_words_sum();
coleenp@3602 487 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 488
coleenp@3602 489 bool contains(const void *ptr);
coleenp@3602 490
coleenp@3602 491 void print_on(outputStream* st) const;
coleenp@3602 492
coleenp@3602 493 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 494 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 495 public:
coleenp@3602 496 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 497 _virtual_spaces(virtual_spaces) {}
coleenp@3602 498
coleenp@3602 499 bool repeat() {
coleenp@3602 500 return _virtual_spaces != NULL;
coleenp@3602 501 }
coleenp@3602 502
coleenp@3602 503 VirtualSpaceNode* get_next() {
coleenp@3602 504 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 505 if (_virtual_spaces != NULL) {
coleenp@3602 506 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 507 }
coleenp@3602 508 return result;
coleenp@3602 509 }
coleenp@3602 510 };
coleenp@3602 511 };
coleenp@3602 512
coleenp@3602 513 class Metadebug : AllStatic {
coleenp@3602 514 // Debugging support for Metaspaces
coleenp@3602 515 static int _deallocate_block_a_lot_count;
coleenp@3602 516 static int _deallocate_chunk_a_lot_count;
coleenp@3602 517 static int _allocation_fail_alot_count;
coleenp@3602 518
coleenp@3602 519 public:
coleenp@3602 520 static int deallocate_block_a_lot_count() {
coleenp@3602 521 return _deallocate_block_a_lot_count;
coleenp@3602 522 }
coleenp@3602 523 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 524 _deallocate_block_a_lot_count = v;
coleenp@3602 525 }
coleenp@3602 526 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 527 _deallocate_block_a_lot_count++;
coleenp@3602 528 }
coleenp@3602 529 static int deallocate_chunk_a_lot_count() {
coleenp@3602 530 return _deallocate_chunk_a_lot_count;
coleenp@3602 531 }
coleenp@3602 532 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 533 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 534 }
coleenp@3602 535 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 536 _deallocate_chunk_a_lot_count++;
coleenp@3602 537 }
coleenp@3602 538
coleenp@3602 539 static void init_allocation_fail_alot_count();
coleenp@3602 540 #ifdef ASSERT
coleenp@3602 541 static bool test_metadata_failure();
coleenp@3602 542 #endif
coleenp@3602 543
coleenp@3602 544 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 545 size_t chunk_word_size);
coleenp@3602 546 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 547 size_t chunk_word_size);
coleenp@3602 548
coleenp@3602 549 };
coleenp@3602 550
coleenp@3602 551 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 552 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 553 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 554
coleenp@3602 555 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 556 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 557 friend class Metaspace;
coleenp@3602 558 friend class Metadebug;
coleenp@3602 559
coleenp@3602 560 private:
jmasa@3947 561
coleenp@3602 562 // protects allocations and contains.
coleenp@3602 563 Mutex* const _lock;
coleenp@3602 564
jmasa@3947 565 // Chunk related size
jmasa@3947 566 size_t _medium_chunk_bunch;
jmasa@3947 567
coleenp@3602 568 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 569 // are done from the current chunk. The list is used for deallocating
coleenp@3602 570 // chunks when the SpaceManager is freed.
jmasa@3761 571 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 572 Metachunk* _current_chunk;
coleenp@3602 573
coleenp@3602 574 // Virtual space where allocation comes from.
coleenp@3602 575 VirtualSpaceList* _vs_list;
coleenp@3602 576
coleenp@3602 577 // Number of small chunks to allocate to a manager
coleenp@3602 578 // If class space manager, small chunks are unlimited
coleenp@3602 579 static uint const _small_chunk_limit;
coleenp@3602 580 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 581
coleenp@3602 582 // Sum of all space in allocated chunks
jmasa@4580 583 size_t _allocated_blocks_words;
jmasa@4580 584
jmasa@4580 585 // Sum of all allocated chunks
jmasa@4580 586 size_t _allocated_chunks_words;
jmasa@4580 587 size_t _allocated_chunks_count;
coleenp@3602 588
coleenp@3602 589 // Free lists of blocks are per SpaceManager since they
coleenp@3602 590 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 591 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 592 // the class loader using the SpaceManager is collected.
coleenp@3602 593 BlockFreelist _block_freelists;
coleenp@3602 594
coleenp@3602 595 // protects virtualspace and chunk expansions
coleenp@3602 596 static const char* _expand_lock_name;
coleenp@3602 597 static const int _expand_lock_rank;
coleenp@3602 598 static Mutex* const _expand_lock;
coleenp@3602 599
jmasa@3947 600 private:
coleenp@3602 601 // Accessors
coleenp@3602 602 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 603 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 604
coleenp@3602 605 BlockFreelist* block_freelists() const {
coleenp@3602 606 return (BlockFreelist*) &_block_freelists;
coleenp@3602 607 }
coleenp@3602 608
coleenp@3602 609 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 610
coleenp@3602 611 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 612 void set_current_chunk(Metachunk* v) {
coleenp@3602 613 _current_chunk = v;
coleenp@3602 614 }
coleenp@3602 615
coleenp@3602 616 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 617
coleenp@3602 618 // Add chunk to the list of chunks in use
coleenp@3602 619 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 620
coleenp@3602 621 Mutex* lock() const { return _lock; }
coleenp@3602 622
jmasa@3947 623 const char* chunk_size_name(ChunkIndex index) const;
jmasa@3947 624
jmasa@3947 625 protected:
jmasa@3947 626 void initialize();
jmasa@3947 627
coleenp@3602 628 public:
jmasa@3947 629 SpaceManager(Mutex* lock,
jmasa@3947 630 VirtualSpaceList* vs_list);
coleenp@3602 631 ~SpaceManager();
coleenp@3602 632
jmasa@3947 633 enum ChunkMultiples {
jmasa@3947 634 MediumChunkMultiple = 4
coleenp@3602 635 };
coleenp@3602 636
coleenp@3602 637 // Accessors
jmasa@3947 638 size_t specialized_chunk_size() { return SpecializedChunk; }
jmasa@3947 639 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; }
jmasa@3947 640 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; }
jmasa@3947 641 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
jmasa@3947 642
jmasa@4580 643 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
jmasa@4580 644 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
jmasa@4580 645 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
jmasa@4580 646 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
jmasa@4580 647
jmasa@3947 648 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@3602 649
coleenp@3602 650 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 651
jmasa@4580 652 // Increment the per Metaspace and global running sums for Metachunks
jmasa@4580 653 // by the given size. This is used when a Metachunk to added to
jmasa@4580 654 // the in-use list.
jmasa@4580 655 void inc_size_metrics(size_t words);
jmasa@4580 656 // Increment the per Metaspace and global running sums Metablocks by the given
jmasa@4580 657 // size. This is used when a Metablock is allocated.
jmasa@4580 658 void inc_used_metrics(size_t words);
jmasa@4580 659 // Delete the portion of the running sums for this SpaceManager. That is,
jmasa@4580 660 // the globals running sums for the Metachunks and Metablocks are
jmasa@4580 661 // decremented for all the Metachunks in-use by this SpaceManager.
jmasa@4580 662 void dec_total_from_size_metrics();
jmasa@4580 663
jmasa@3947 664 // Set the sizes for the initial chunks.
jmasa@3947 665 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 666 size_t* chunk_word_size,
jmasa@3947 667 size_t* class_chunk_word_size);
jmasa@3947 668
coleenp@3602 669 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 670 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 671 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 672 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 673 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 674
coleenp@3602 675 size_t sum_count_in_chunks_in_use();
coleenp@3602 676 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 677
jmasa@3947 678 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@3947 679
coleenp@3602 680 // Block allocation and deallocation.
coleenp@3602 681 // Allocates a block from the current chunk
coleenp@3602 682 MetaWord* allocate(size_t word_size);
coleenp@3602 683
coleenp@3602 684 // Helper for allocations
jmasa@3761 685 MetaWord* allocate_work(size_t word_size);
coleenp@3602 686
coleenp@3602 687 // Returns a block to the per manager freelist
jmasa@3761 688 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 689
coleenp@3602 690 // Based on the allocation size and a minimum chunk size,
coleenp@3602 691 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 692 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 693
coleenp@3602 694 // Called when an allocation from the current chunk fails.
coleenp@3602 695 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 696 // and allocates from that chunk.
jmasa@3761 697 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 698
coleenp@3602 699 // debugging support.
coleenp@3602 700
coleenp@3602 701 void dump(outputStream* const out) const;
coleenp@3602 702 void print_on(outputStream* st) const;
coleenp@3602 703 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 704
coleenp@3602 705 void verify();
jmasa@3892 706 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 707 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 708 #ifdef ASSERT
jmasa@4580 709 void verify_allocated_blocks_words();
coleenp@3602 710 #endif
coleenp@3602 711 };
coleenp@3602 712
coleenp@3602 713 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 714
coleenp@3602 715 const char* SpaceManager::_expand_lock_name =
coleenp@3602 716 "SpaceManager chunk allocation lock";
coleenp@3602 717 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 718 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 719 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 720 SpaceManager::_expand_lock_name,
coleenp@3602 721 Mutex::_allow_vm_block_flag);
coleenp@3602 722
jmasa@4572 723 void VirtualSpaceNode::inc_container_count() {
jmasa@4572 724 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 725 _container_count++;
jmasa@4572 726 assert(_container_count == container_count_slow(),
jmasa@4572 727 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 728 "container_count_slow() " SIZE_FORMAT,
jmasa@4572 729 _container_count, container_count_slow()));
jmasa@4572 730 }
jmasa@4572 731
jmasa@4572 732 void VirtualSpaceNode::dec_container_count() {
jmasa@4572 733 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 734 _container_count--;
jmasa@4572 735 }
jmasa@4572 736
jmasa@4572 737 #ifdef ASSERT
jmasa@4572 738 void VirtualSpaceNode::verify_container_count() {
jmasa@4572 739 assert(_container_count == container_count_slow(),
jmasa@4572 740 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 741 "container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
jmasa@4572 742 }
jmasa@4572 743 #endif
jmasa@4572 744
coleenp@3602 745 // BlockFreelist methods
coleenp@3602 746
coleenp@3602 747 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 748
coleenp@3602 749 BlockFreelist::~BlockFreelist() {
coleenp@3602 750 if (_dictionary != NULL) {
coleenp@3602 751 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 752 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 753 }
coleenp@3602 754 delete _dictionary;
coleenp@3602 755 }
coleenp@3602 756 }
coleenp@3602 757
jmasa@3761 758 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 759 Metablock* block = (Metablock*) p;
jmasa@3761 760 block->set_word_size(word_size);
jmasa@3761 761 block->set_prev(NULL);
jmasa@3761 762 block->set_next(NULL);
jmasa@3761 763
coleenp@3602 764 return block;
coleenp@3602 765 }
coleenp@3602 766
jmasa@3761 767 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 768 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 769 if (dictionary() == NULL) {
jmasa@3761 770 _dictionary = new BlockTreeDictionary();
coleenp@3602 771 }
jmasa@3761 772 dictionary()->return_chunk(free_chunk);
coleenp@3602 773 }
coleenp@3602 774
jmasa@3761 775 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 776 if (dictionary() == NULL) {
coleenp@3602 777 return NULL;
coleenp@3602 778 }
coleenp@3602 779
jmasa@3761 780 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 781 // Dark matter. Too small for dictionary.
coleenp@3602 782 return NULL;
coleenp@3602 783 }
jmasa@3761 784
jmasa@3761 785 Metablock* free_block =
jmasa@3761 786 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 787 if (free_block == NULL) {
jmasa@3761 788 return NULL;
jmasa@3761 789 }
jmasa@3761 790
jmasa@3761 791 return (MetaWord*) free_block;
coleenp@3602 792 }
coleenp@3602 793
coleenp@3602 794 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 795 if (dictionary() == NULL) {
coleenp@3602 796 return;
coleenp@3602 797 }
coleenp@3602 798 dictionary()->print_free_lists(st);
coleenp@3602 799 }
coleenp@3602 800
coleenp@3602 801 // VirtualSpaceNode methods
coleenp@3602 802
coleenp@3602 803 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 804 _rs.release();
jmasa@4572 805 #ifdef ASSERT
jmasa@4572 806 size_t word_size = sizeof(*this) / BytesPerWord;
jmasa@4572 807 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
jmasa@4572 808 #endif
coleenp@3602 809 }
coleenp@3602 810
coleenp@3602 811 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 812 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 813 }
coleenp@3602 814
coleenp@3602 815 // Space committed in the VirtualSpace
coleenp@3602 816 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 817 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 818 }
coleenp@3602 819
jmasa@4580 820 size_t VirtualSpaceNode::free_words_in_vs() const {
jmasa@4580 821 return pointer_delta(end(), top(), sizeof(MetaWord));
jmasa@4580 822 }
coleenp@3602 823
coleenp@3602 824 // Allocates the chunk from the virtual space only.
coleenp@3602 825 // This interface is also used internally for debugging. Not all
coleenp@3602 826 // chunks removed here are necessarily used for allocation.
coleenp@3602 827 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 828 // Bottom of the new chunk
coleenp@3602 829 MetaWord* chunk_limit = top();
coleenp@3602 830 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 831
coleenp@3602 832 if (!is_available(chunk_word_size)) {
coleenp@3602 833 if (TraceMetadataChunkAllocation) {
coleenp@3602 834 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 835 // Dump some information about the virtual space that is nearly full
coleenp@3602 836 print_on(tty);
coleenp@3602 837 }
coleenp@3602 838 return NULL;
coleenp@3602 839 }
coleenp@3602 840
coleenp@3602 841 // Take the space (bump top on the current virtual space).
coleenp@3602 842 inc_top(chunk_word_size);
coleenp@3602 843
jmasa@4572 844 // Initialize the chunk
jmasa@4572 845 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
coleenp@3602 846 return result;
coleenp@3602 847 }
coleenp@3602 848
coleenp@3602 849
coleenp@3602 850 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 851 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 852 size_t bytes = words * BytesPerWord;
coleenp@3602 853 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 854 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 855 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 856 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 857 virtual_space()->print();
coleenp@3602 858 }
coleenp@3602 859 return result;
coleenp@3602 860 }
coleenp@3602 861
coleenp@3602 862 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 863 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 864 size_t bytes = words * BytesPerWord;
coleenp@3602 865 virtual_space()->shrink_by(bytes);
coleenp@3602 866 return true;
coleenp@3602 867 }
coleenp@3602 868
coleenp@3602 869 // Add another chunk to the chunk list.
coleenp@3602 870
coleenp@3602 871 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 872 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 873 Metachunk* result = take_from_committed(chunk_word_size);
jmasa@4572 874 if (result != NULL) {
jmasa@4572 875 inc_container_count();
jmasa@4572 876 }
jmasa@4572 877 return result;
coleenp@3602 878 }
coleenp@3602 879
coleenp@3602 880 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 881 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 882
coleenp@3602 883 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 884
coleenp@3602 885 if (new_chunk == NULL) {
coleenp@3602 886 // Only a small part of the virtualspace is committed when first
coleenp@3602 887 // allocated so committing more here can be expected.
coleenp@3602 888 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 889 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 890 page_size_words);
coleenp@3602 891 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 892 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 893 }
coleenp@3602 894 return new_chunk;
coleenp@3602 895 }
coleenp@3602 896
coleenp@3602 897 bool VirtualSpaceNode::initialize() {
coleenp@3602 898
coleenp@3602 899 if (!_rs.is_reserved()) {
coleenp@3602 900 return false;
coleenp@3602 901 }
coleenp@3602 902
jmasa@3947 903 // An allocation out of this Virtualspace that is larger
jmasa@3947 904 // than an initial commit size can waste that initial committed
jmasa@3947 905 // space.
jmasa@3947 906 size_t committed_byte_size = 0;
coleenp@3602 907 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 908 if (result) {
coleenp@3602 909 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 910 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 911 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 912
coleenp@3603 913 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 914 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 915 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 916 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 917 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 918 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 919 _rs.size() / BytesPerWord));
coleenp@3602 920 }
coleenp@3602 921
coleenp@3602 922 return result;
coleenp@3602 923 }
coleenp@3602 924
coleenp@3602 925 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 926 size_t used = used_words_in_vs();
coleenp@3602 927 size_t capacity = capacity_words_in_vs();
coleenp@3602 928 VirtualSpace* vs = virtual_space();
coleenp@3602 929 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 930 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 931 PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@3947 932 vs, capacity / K,
jmasa@3947 933 capacity == 0 ? 0 : used * 100 / capacity,
coleenp@3602 934 bottom(), top(), end(),
coleenp@3602 935 vs->high_boundary());
coleenp@3602 936 }
coleenp@3602 937
coleenp@3869 938 #ifdef ASSERT
coleenp@3602 939 void VirtualSpaceNode::mangle() {
coleenp@3602 940 size_t word_size = capacity_words_in_vs();
coleenp@3602 941 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 942 }
coleenp@3869 943 #endif // ASSERT
coleenp@3602 944
coleenp@3602 945 // VirtualSpaceList methods
coleenp@3602 946 // Space allocated from the VirtualSpace
coleenp@3602 947
coleenp@3602 948 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 949 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 950 while (iter.repeat()) {
coleenp@3602 951 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 952 delete vsl;
coleenp@3602 953 }
coleenp@3602 954 }
coleenp@3602 955
jmasa@4572 956 void VirtualSpaceList::inc_virtual_space_total(size_t v) {
jmasa@4572 957 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 958 _virtual_space_total = _virtual_space_total + v;
jmasa@4572 959 }
jmasa@4572 960 void VirtualSpaceList::dec_virtual_space_total(size_t v) {
jmasa@4572 961 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 962 _virtual_space_total = _virtual_space_total - v;
jmasa@4572 963 }
jmasa@4572 964
jmasa@4572 965 void VirtualSpaceList::inc_virtual_space_count() {
jmasa@4572 966 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 967 _virtual_space_count++;
jmasa@4572 968 }
jmasa@4572 969 void VirtualSpaceList::dec_virtual_space_count() {
jmasa@4572 970 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 971 _virtual_space_count--;
jmasa@4572 972 }
jmasa@4572 973
jmasa@4572 974 void ChunkManager::remove_chunk(Metachunk* chunk) {
jmasa@4572 975 size_t word_size = chunk->word_size();
jmasa@4572 976 ChunkIndex index = list_index(word_size);
jmasa@4572 977 if (index != HumongousIndex) {
jmasa@4572 978 free_chunks(index)->remove_chunk(chunk);
jmasa@4572 979 } else {
jmasa@4572 980 humongous_dictionary()->remove_chunk(chunk);
jmasa@4572 981 }
jmasa@4572 982
jmasa@4572 983 // Chunk is being removed from the chunks free list.
jmasa@4572 984 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@4572 985 }
jmasa@4572 986
jmasa@4572 987 // Walk the list of VirtualSpaceNodes and delete
jmasa@4572 988 // nodes with a 0 container_count. Remove Metachunks in
jmasa@4572 989 // the node from their respective freelists.
jmasa@4572 990 void VirtualSpaceList::purge() {
jmasa@4572 991 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 992 // Don't use a VirtualSpaceListIterator because this
jmasa@4572 993 // list is being changed and a straightforward use of an iterator is not safe.
jmasa@4572 994 VirtualSpaceNode* purged_vsl = NULL;
jmasa@4572 995 VirtualSpaceNode* prev_vsl = virtual_space_list();
jmasa@4572 996 VirtualSpaceNode* next_vsl = prev_vsl;
jmasa@4572 997 while (next_vsl != NULL) {
jmasa@4572 998 VirtualSpaceNode* vsl = next_vsl;
jmasa@4572 999 next_vsl = vsl->next();
jmasa@4572 1000 // Don't free the current virtual space since it will likely
jmasa@4572 1001 // be needed soon.
jmasa@4572 1002 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
jmasa@4572 1003 // Unlink it from the list
jmasa@4572 1004 if (prev_vsl == vsl) {
jmasa@4572 1005 // This is the case of the current note being the first note.
jmasa@4572 1006 assert(vsl == virtual_space_list(), "Expected to be the first note");
jmasa@4572 1007 set_virtual_space_list(vsl->next());
jmasa@4572 1008 } else {
jmasa@4572 1009 prev_vsl->set_next(vsl->next());
jmasa@4572 1010 }
jmasa@4572 1011
jmasa@4572 1012 vsl->purge(chunk_manager());
jmasa@4572 1013 dec_virtual_space_total(vsl->reserved()->word_size());
jmasa@4572 1014 dec_virtual_space_count();
jmasa@4572 1015 purged_vsl = vsl;
jmasa@4572 1016 delete vsl;
jmasa@4572 1017 } else {
jmasa@4572 1018 prev_vsl = vsl;
jmasa@4572 1019 }
jmasa@4572 1020 }
jmasa@4572 1021 #ifdef ASSERT
jmasa@4572 1022 if (purged_vsl != NULL) {
jmasa@4572 1023 // List should be stable enough to use an iterator here.
jmasa@4572 1024 VirtualSpaceListIterator iter(virtual_space_list());
jmasa@4572 1025 while (iter.repeat()) {
jmasa@4572 1026 VirtualSpaceNode* vsl = iter.get_next();
jmasa@4572 1027 assert(vsl != purged_vsl, "Purge of vsl failed");
jmasa@4572 1028 }
jmasa@4572 1029 }
jmasa@4572 1030 #endif
jmasa@4572 1031 }
jmasa@4572 1032
coleenp@3602 1033 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 1034 size_t allocated_by_vs = 0;
coleenp@3602 1035 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1036 while (iter.repeat()) {
coleenp@3602 1037 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1038 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 1039 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 1040 }
coleenp@3602 1041 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 1042 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 1043 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 1044 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 1045 size_t used =
coleenp@3602 1046 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 1047 return used;
coleenp@3602 1048 }
coleenp@3602 1049
coleenp@3602 1050 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 1051 // for metadata. This is the upper limit on the capacity
coleenp@3602 1052 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 1053 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 1054 size_t capacity = 0;
coleenp@3602 1055 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1056 while (iter.repeat()) {
coleenp@3602 1057 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1058 capacity += vsl->capacity_words_in_vs();
coleenp@3602 1059 }
coleenp@3602 1060 return capacity;
coleenp@3602 1061 }
coleenp@3602 1062
coleenp@3602 1063 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 1064 _is_class(false),
coleenp@3602 1065 _virtual_space_list(NULL),
coleenp@3602 1066 _current_virtual_space(NULL),
coleenp@3602 1067 _virtual_space_total(0),
coleenp@3602 1068 _virtual_space_count(0) {
coleenp@3602 1069 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1070 Mutex::_no_safepoint_check_flag);
coleenp@3602 1071 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 1072
jmasa@4497 1073 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1074 _chunk_manager.free_chunks(SmallIndex)->set_size(SmallChunk);
jmasa@4497 1075 _chunk_manager.free_chunks(MediumIndex)->set_size(MediumChunk);
coleenp@3602 1076 assert(initialization_succeeded,
coleenp@3602 1077 " VirtualSpaceList initialization should not fail");
coleenp@3602 1078 }
coleenp@3602 1079
coleenp@3602 1080 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 1081 _is_class(true),
coleenp@3602 1082 _virtual_space_list(NULL),
coleenp@3602 1083 _current_virtual_space(NULL),
coleenp@3602 1084 _virtual_space_total(0),
coleenp@3602 1085 _virtual_space_count(0) {
coleenp@3602 1086 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1087 Mutex::_no_safepoint_check_flag);
coleenp@3602 1088 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 1089 bool succeeded = class_entry->initialize();
jmasa@4497 1090 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1091 _chunk_manager.free_chunks(SmallIndex)->set_size(ClassSmallChunk);
jmasa@4497 1092 _chunk_manager.free_chunks(MediumIndex)->set_size(ClassMediumChunk);
coleenp@3602 1093 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 1094 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 1095 }
coleenp@3602 1096
jmasa@4580 1097 size_t VirtualSpaceList::free_bytes() {
jmasa@4580 1098 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
jmasa@4580 1099 }
jmasa@4580 1100
coleenp@3602 1101 // Allocate another meta virtual space and add it to the list.
coleenp@3602 1102 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 1103 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1104 if (vs_word_size == 0) {
coleenp@3602 1105 return false;
coleenp@3602 1106 }
coleenp@3602 1107 // Reserve the space
coleenp@3602 1108 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 1109 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 1110
coleenp@3602 1111 // Allocate the meta virtual space and initialize it.
coleenp@3602 1112 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 1113 if (!new_entry->initialize()) {
coleenp@3602 1114 delete new_entry;
coleenp@3602 1115 return false;
coleenp@3602 1116 } else {
coleenp@3860 1117 // ensure lock-free iteration sees fully initialized node
coleenp@3860 1118 OrderAccess::storestore();
coleenp@3602 1119 link_vs(new_entry, vs_word_size);
coleenp@3602 1120 return true;
coleenp@3602 1121 }
coleenp@3602 1122 }
coleenp@3602 1123
coleenp@3602 1124 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 1125 if (virtual_space_list() == NULL) {
coleenp@3602 1126 set_virtual_space_list(new_entry);
coleenp@3602 1127 } else {
coleenp@3602 1128 current_virtual_space()->set_next(new_entry);
coleenp@3602 1129 }
coleenp@3602 1130 set_current_virtual_space(new_entry);
coleenp@3602 1131 inc_virtual_space_total(vs_word_size);
coleenp@3602 1132 inc_virtual_space_count();
coleenp@3602 1133 #ifdef ASSERT
coleenp@3602 1134 new_entry->mangle();
coleenp@3602 1135 #endif
coleenp@3602 1136 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 1137 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 1138 vsl->print_on(tty);
coleenp@3602 1139 }
coleenp@3602 1140 }
coleenp@3602 1141
coleenp@3602 1142 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@3947 1143 size_t grow_chunks_by_words,
jmasa@3947 1144 size_t medium_chunk_bunch) {
coleenp@3602 1145
coleenp@3602 1146 // Get a chunk from the chunk freelist
coleenp@3602 1147 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 1148
jmasa@4572 1149 if (next != NULL) {
jmasa@4572 1150 next->container()->inc_container_count();
jmasa@4572 1151 } else {
jmasa@4572 1152 // Allocate a chunk out of the current virtual space.
coleenp@3602 1153 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1154 }
coleenp@3602 1155
coleenp@3602 1156 if (next == NULL) {
coleenp@3602 1157 // Not enough room in current virtual space. Try to commit
coleenp@3602 1158 // more space.
jmasa@3947 1159 size_t expand_vs_by_words = MAX2(medium_chunk_bunch,
jmasa@3947 1160 grow_chunks_by_words);
coleenp@3602 1161 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1162 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 1163 page_size_words);
coleenp@3602 1164 bool vs_expanded =
coleenp@3602 1165 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 1166 if (!vs_expanded) {
coleenp@3602 1167 // Should the capacity of the metaspaces be expanded for
coleenp@3602 1168 // this allocation? If it's the virtual space for classes and is
coleenp@3602 1169 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 1170 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 1171 // Get another virtual space.
coleenp@3602 1172 size_t grow_vs_words =
coleenp@3602 1173 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 1174 if (grow_vs(grow_vs_words)) {
coleenp@3602 1175 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 1176 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 1177 }
coleenp@3602 1178 } else {
coleenp@3602 1179 // Allocation will fail and induce a GC
coleenp@3602 1180 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1181 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 1182 " Fail instead of expand the metaspace");
coleenp@3602 1183 }
coleenp@3602 1184 }
coleenp@3602 1185 } else {
coleenp@3602 1186 // The virtual space expanded, get a new chunk
coleenp@3602 1187 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1188 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 1189 }
coleenp@3602 1190 }
coleenp@3602 1191
jmasa@3947 1192 assert(next == NULL || (next->next() == NULL && next->prev() == NULL),
jmasa@3947 1193 "New chunk is still on some list");
coleenp@3602 1194 return next;
coleenp@3602 1195 }
coleenp@3602 1196
jmasa@3947 1197 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size,
jmasa@3947 1198 size_t chunk_bunch) {
jmasa@3947 1199 // Get a chunk from the chunk freelist
jmasa@3947 1200 Metachunk* new_chunk = get_new_chunk(chunk_word_size,
jmasa@3947 1201 chunk_word_size,
jmasa@3947 1202 chunk_bunch);
jmasa@3947 1203 return new_chunk;
jmasa@3947 1204 }
jmasa@3947 1205
coleenp@3602 1206 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1207 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1208 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1209 while (iter.repeat()) {
coleenp@3602 1210 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1211 node->print_on(st);
coleenp@3602 1212 }
coleenp@3602 1213 }
coleenp@3602 1214 }
coleenp@3602 1215
coleenp@3602 1216 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1217 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1218 VirtualSpaceListIterator iter(list);
coleenp@3602 1219 while (iter.repeat()) {
coleenp@3602 1220 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1221 if (node->reserved()->contains(ptr)) {
coleenp@3602 1222 return true;
coleenp@3602 1223 }
coleenp@3602 1224 }
coleenp@3602 1225 return false;
coleenp@3602 1226 }
coleenp@3602 1227
coleenp@3602 1228
coleenp@3602 1229 // MetaspaceGC methods
coleenp@3602 1230
coleenp@3602 1231 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1232 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1233 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1234 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1235 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1236 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1237 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1238 //
coleenp@3602 1239 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1240 // resize the capacity of the metaspaces. The current implementation
jmasa@4580 1241 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
coleenp@3602 1242 // to resize the Java heap by some GC's. New flags can be implemented
jmasa@4580 1243 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
coleenp@3602 1244 // free space is desirable in the metaspace capacity to decide how much
jmasa@4146 1245 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
coleenp@3602 1246 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1247 // the HWM.
coleenp@3602 1248
coleenp@3602 1249 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1250 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1251 // another expansion is not requested too soon. If that is not
coleenp@3602 1252 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1253 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1254 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1255 // some.
coleenp@3602 1256 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1257 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1258 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1259 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1260 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1261 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1262 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1263 if (delta_words > min_delta_words) {
coleenp@3602 1264 // Don't want to hit the high water mark on the next
coleenp@3602 1265 // allocation so make the delta greater than just enough
coleenp@3602 1266 // for this allocation.
coleenp@3602 1267 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1268 if (delta_words > max_delta_words) {
coleenp@3602 1269 // This allocation is large but the next ones are probably not
coleenp@3602 1270 // so increase by the minimum.
coleenp@3602 1271 delta_words = delta_words + min_delta_words;
coleenp@3602 1272 }
coleenp@3602 1273 }
coleenp@3602 1274 return delta_words;
coleenp@3602 1275 }
coleenp@3602 1276
coleenp@3602 1277 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
jmasa@4580 1278
jmasa@4580 1279 size_t committed_capacity_bytes = MetaspaceAux::allocated_capacity_bytes();
mgerdin@4355 1280 // If the user wants a limit, impose one.
jmasa@4580 1281 size_t max_metaspace_size_bytes = MaxMetaspaceSize;
jmasa@4580 1282 size_t metaspace_size_bytes = MetaspaceSize;
mgerdin@4355 1283 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
mgerdin@4355 1284 MetaspaceAux::reserved_in_bytes() >= MaxMetaspaceSize) {
mgerdin@4355 1285 return false;
mgerdin@4355 1286 }
coleenp@3602 1287
coleenp@3602 1288 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1289 // metadata virtual space.
coleenp@3602 1290 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1291
coleenp@3602 1292 // If this is part of an allocation after a GC, expand
coleenp@3602 1293 // unconditionally.
jmasa@4580 1294 if (MetaspaceGC::expand_after_GC()) {
coleenp@3602 1295 return true;
coleenp@3602 1296 }
coleenp@3602 1297
jmasa@4580 1298
mgerdin@4355 1299
coleenp@3602 1300 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1301 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1302 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1303 // until that minimum capacity is exceeded.
jmasa@4580 1304 if (committed_capacity_bytes < metaspace_size_bytes ||
coleenp@3602 1305 capacity_until_GC() == 0) {
jmasa@4580 1306 set_capacity_until_GC(metaspace_size_bytes);
coleenp@3602 1307 return true;
coleenp@3602 1308 } else {
jmasa@4580 1309 if (committed_capacity_bytes < capacity_until_GC()) {
coleenp@3602 1310 return true;
coleenp@3602 1311 } else {
coleenp@3602 1312 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1313 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1314 " capacity_until_GC " SIZE_FORMAT
jmasa@4580 1315 " allocated_capacity_bytes " SIZE_FORMAT,
coleenp@3602 1316 word_size,
coleenp@3602 1317 capacity_until_GC(),
jmasa@4580 1318 MetaspaceAux::allocated_capacity_bytes());
coleenp@3602 1319 }
coleenp@3602 1320 return false;
coleenp@3602 1321 }
coleenp@3602 1322 }
coleenp@3602 1323 }
coleenp@3602 1324
jmasa@4580 1325
coleenp@3602 1326
coleenp@3602 1327 void MetaspaceGC::compute_new_size() {
coleenp@3602 1328 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1329 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1330 _shrink_factor = 0;
coleenp@3602 1331
jmasa@4580 1332 // Until a faster way of calculating the "used" quantity is implemented,
jmasa@4580 1333 // use "capacity".
jmasa@4580 1334 const size_t used_after_gc = MetaspaceAux::allocated_capacity_bytes();
jmasa@4580 1335 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
coleenp@3602 1336
jmasa@4146 1337 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1338 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1339
coleenp@3602 1340 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1341 size_t minimum_desired_capacity =
coleenp@3602 1342 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1343 // Don't shrink less than the initial generation size
coleenp@3602 1344 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1345 MetaspaceSize);
coleenp@3602 1346
coleenp@3602 1347 if (PrintGCDetails && Verbose) {
coleenp@3602 1348 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1349 gclog_or_tty->print_cr(" "
coleenp@3602 1350 " minimum_free_percentage: %6.2f"
coleenp@3602 1351 " maximum_used_percentage: %6.2f",
coleenp@3602 1352 minimum_free_percentage,
coleenp@3602 1353 maximum_used_percentage);
coleenp@3602 1354 gclog_or_tty->print_cr(" "
jmasa@4580 1355 " used_after_gc : %6.1fKB",
jmasa@4580 1356 used_after_gc / (double) K);
coleenp@3602 1357 }
coleenp@3602 1358
coleenp@3602 1359
jmasa@4580 1360 size_t shrink_bytes = 0;
coleenp@3602 1361 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1362 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1363 // increment the HWM.
coleenp@3602 1364 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1365 // Don't expand unless it's significant
coleenp@3602 1366 if (expand_bytes >= MinMetaspaceExpansion) {
jmasa@4580 1367 MetaspaceGC::set_capacity_until_GC(capacity_until_GC + expand_bytes);
coleenp@3602 1368 }
coleenp@3602 1369 if (PrintGCDetails && Verbose) {
jmasa@4580 1370 size_t new_capacity_until_GC = capacity_until_GC;
coleenp@3602 1371 gclog_or_tty->print_cr(" expanding:"
jmasa@4580 1372 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1373 " expand_bytes: %6.1fKB"
jmasa@4580 1374 " MinMetaspaceExpansion: %6.1fKB"
jmasa@4580 1375 " new metaspace HWM: %6.1fKB",
coleenp@3602 1376 minimum_desired_capacity / (double) K,
coleenp@3602 1377 expand_bytes / (double) K,
coleenp@3602 1378 MinMetaspaceExpansion / (double) K,
coleenp@3602 1379 new_capacity_until_GC / (double) K);
coleenp@3602 1380 }
coleenp@3602 1381 return;
coleenp@3602 1382 }
coleenp@3602 1383
coleenp@3602 1384 // No expansion, now see if we want to shrink
coleenp@3602 1385 // We would never want to shrink more than this
jmasa@4580 1386 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
jmasa@4580 1387 assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
jmasa@4580 1388 max_shrink_bytes));
coleenp@3602 1389
coleenp@3602 1390 // Should shrinking be considered?
jmasa@4146 1391 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1392 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1393 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1394 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1395 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1396 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1397 MetaspaceSize);
jmasa@4580 1398 if (PrintGCDetails && Verbose) {
coleenp@3602 1399 gclog_or_tty->print_cr(" "
coleenp@3602 1400 " maximum_free_percentage: %6.2f"
coleenp@3602 1401 " minimum_used_percentage: %6.2f",
coleenp@3602 1402 maximum_free_percentage,
coleenp@3602 1403 minimum_used_percentage);
coleenp@3602 1404 gclog_or_tty->print_cr(" "
jmasa@4580 1405 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1406 " maximum_desired_capacity: %6.1fKB",
coleenp@3602 1407 minimum_desired_capacity / (double) K,
coleenp@3602 1408 maximum_desired_capacity / (double) K);
coleenp@3602 1409 }
coleenp@3602 1410
coleenp@3602 1411 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1412 "sanity check");
coleenp@3602 1413
coleenp@3602 1414 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1415 // Capacity too large, compute shrinking size
jmasa@4580 1416 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1417 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1418 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1419 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1420 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1421 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1422 // size without shrinking, it goes back to 0%.
jmasa@4580 1423 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
jmasa@4580 1424 assert(shrink_bytes <= max_shrink_bytes,
coleenp@3602 1425 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
jmasa@4580 1426 shrink_bytes, max_shrink_bytes));
coleenp@3602 1427 if (current_shrink_factor == 0) {
coleenp@3602 1428 _shrink_factor = 10;
coleenp@3602 1429 } else {
coleenp@3602 1430 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1431 }
coleenp@3602 1432 if (PrintGCDetails && Verbose) {
coleenp@3602 1433 gclog_or_tty->print_cr(" "
coleenp@3602 1434 " shrinking:"
coleenp@3602 1435 " initSize: %.1fK"
coleenp@3602 1436 " maximum_desired_capacity: %.1fK",
coleenp@3602 1437 MetaspaceSize / (double) K,
coleenp@3602 1438 maximum_desired_capacity / (double) K);
coleenp@3602 1439 gclog_or_tty->print_cr(" "
jmasa@4580 1440 " shrink_bytes: %.1fK"
coleenp@3602 1441 " current_shrink_factor: %d"
coleenp@3602 1442 " new shrink factor: %d"
coleenp@3602 1443 " MinMetaspaceExpansion: %.1fK",
jmasa@4580 1444 shrink_bytes / (double) K,
coleenp@3602 1445 current_shrink_factor,
coleenp@3602 1446 _shrink_factor,
coleenp@3602 1447 MinMetaspaceExpansion / (double) K);
coleenp@3602 1448 }
coleenp@3602 1449 }
coleenp@3602 1450 }
coleenp@3602 1451
coleenp@3602 1452 // Don't shrink unless it's significant
jmasa@4580 1453 if (shrink_bytes >= MinMetaspaceExpansion &&
jmasa@4580 1454 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
jmasa@4580 1455 MetaspaceGC::set_capacity_until_GC(capacity_until_GC - shrink_bytes);
coleenp@3602 1456 }
coleenp@3602 1457 }
coleenp@3602 1458
coleenp@3602 1459 // Metadebug methods
coleenp@3602 1460
coleenp@3602 1461 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1462 size_t chunk_word_size){
coleenp@3602 1463 #ifdef ASSERT
coleenp@3602 1464 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1465 if (MetaDataDeallocateALot &&
coleenp@3602 1466 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1467 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1468 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1469 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1470 if (dummy_chunk == NULL) {
coleenp@3602 1471 break;
coleenp@3602 1472 }
coleenp@3602 1473 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1474
coleenp@3602 1475 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1476 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1477 sm->sum_count_in_chunks_in_use());
coleenp@3602 1478 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1479 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1480 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1481 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1482 }
coleenp@3602 1483 }
coleenp@3602 1484 } else {
coleenp@3602 1485 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1486 }
coleenp@3602 1487 #endif
coleenp@3602 1488 }
coleenp@3602 1489
coleenp@3602 1490 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1491 size_t raw_word_size){
coleenp@3602 1492 #ifdef ASSERT
coleenp@3602 1493 if (MetaDataDeallocateALot &&
coleenp@3602 1494 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1495 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1496 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1497 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1498 if (dummy_block == 0) {
coleenp@3602 1499 break;
coleenp@3602 1500 }
jmasa@3761 1501 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1502 }
coleenp@3602 1503 } else {
coleenp@3602 1504 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1505 }
coleenp@3602 1506 #endif
coleenp@3602 1507 }
coleenp@3602 1508
coleenp@3602 1509 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1510 if (MetadataAllocationFailALot) {
coleenp@3602 1511 _allocation_fail_alot_count =
coleenp@3602 1512 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1513 }
coleenp@3602 1514 }
coleenp@3602 1515
coleenp@3602 1516 #ifdef ASSERT
coleenp@3602 1517 bool Metadebug::test_metadata_failure() {
coleenp@3602 1518 if (MetadataAllocationFailALot &&
coleenp@3602 1519 Threads::is_vm_complete()) {
coleenp@3602 1520 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1521 _allocation_fail_alot_count--;
coleenp@3602 1522 } else {
coleenp@3602 1523 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1524 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1525 "MetadataAllocationFailALot");
coleenp@3602 1526 }
coleenp@3602 1527 init_allocation_fail_alot_count();
coleenp@3602 1528 return true;
coleenp@3602 1529 }
coleenp@3602 1530 }
coleenp@3602 1531 return false;
coleenp@3602 1532 }
coleenp@3602 1533 #endif
coleenp@3602 1534
coleenp@3602 1535 // ChunkManager methods
coleenp@3602 1536
coleenp@3602 1537 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1538 // work with the CMS collector because its use of additional locks
coleenp@3602 1539 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1540 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1541
coleenp@3602 1542 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1543 #ifdef ASSERT
coleenp@3602 1544 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1545 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1546 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1547 slow_locked_verify_free_chunks_total();
coleenp@3602 1548 }
coleenp@3602 1549 #endif
coleenp@3602 1550 return _free_chunks_total;
coleenp@3602 1551 }
coleenp@3602 1552
coleenp@3602 1553 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1554 return free_chunks_total() * BytesPerWord;
coleenp@3602 1555 }
coleenp@3602 1556
coleenp@3602 1557 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1558 #ifdef ASSERT
coleenp@3602 1559 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1560 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1561 Mutex::_no_safepoint_check_flag);
coleenp@3602 1562 // This lock is only needed in debug because the verification
coleenp@3602 1563 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1564 slow_locked_verify_free_chunks_count();
coleenp@3602 1565 }
coleenp@3602 1566 #endif
mgerdin@3829 1567 return _free_chunks_count;
coleenp@3602 1568 }
coleenp@3602 1569
coleenp@3602 1570 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1571 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1572 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1573 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1574 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1575 sum_free_chunks()));
coleenp@3602 1576 }
coleenp@3602 1577
coleenp@3602 1578 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1579 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1580 Mutex::_no_safepoint_check_flag);
coleenp@3602 1581 locked_verify_free_chunks_total();
coleenp@3602 1582 }
coleenp@3602 1583
coleenp@3602 1584 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1585 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1586 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1587 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1588 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1589 sum_free_chunks_count()));
coleenp@3602 1590 }
coleenp@3602 1591
coleenp@3602 1592 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1593 #ifdef ASSERT
coleenp@3602 1594 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1595 Mutex::_no_safepoint_check_flag);
coleenp@3602 1596 locked_verify_free_chunks_count();
coleenp@3602 1597 #endif
coleenp@3602 1598 }
coleenp@3602 1599
coleenp@3602 1600 void ChunkManager::verify() {
mgerdin@3829 1601 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1602 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1603 locked_verify();
coleenp@3602 1604 }
coleenp@3602 1605
coleenp@3602 1606 void ChunkManager::locked_verify() {
jmasa@3761 1607 locked_verify_free_chunks_count();
coleenp@3602 1608 locked_verify_free_chunks_total();
coleenp@3602 1609 }
coleenp@3602 1610
coleenp@3602 1611 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1612 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1613 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1614 _free_chunks_total, _free_chunks_count);
coleenp@3602 1615 }
coleenp@3602 1616
coleenp@3602 1617 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1618 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1619 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1620 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1621 }
coleenp@3602 1622 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1623 return &_free_chunks[index];
coleenp@3602 1624 }
coleenp@3602 1625
coleenp@3602 1626 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1627 // methods that are used in product builds.
coleenp@3602 1628 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1629 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1630 size_t result = 0;
jmasa@3947 1631 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1632 ChunkList* list = free_chunks(i);
coleenp@3602 1633
coleenp@3602 1634 if (list == NULL) {
coleenp@3602 1635 continue;
coleenp@3602 1636 }
coleenp@3602 1637
jmasa@4497 1638 result = result + list->count() * list->size();
coleenp@3602 1639 }
jmasa@3761 1640 result = result + humongous_dictionary()->total_size();
coleenp@3602 1641 return result;
coleenp@3602 1642 }
coleenp@3602 1643
coleenp@3602 1644 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1645 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1646 size_t count = 0;
jmasa@3947 1647 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1648 ChunkList* list = free_chunks(i);
coleenp@3602 1649 if (list == NULL) {
coleenp@3602 1650 continue;
coleenp@3602 1651 }
jmasa@4497 1652 count = count + list->count();
coleenp@3602 1653 }
jmasa@3761 1654 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1655 return count;
coleenp@3602 1656 }
coleenp@3602 1657
coleenp@3602 1658 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1659 ChunkIndex index = list_index(word_size);
jmasa@3947 1660 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1661 return free_chunks(index);
coleenp@3602 1662 }
coleenp@3602 1663
coleenp@3602 1664 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1665 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1666 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1667 chunk->set_next(free_list->head());
coleenp@3602 1668 free_list->set_head(chunk);
coleenp@3602 1669 // chunk is being returned to the chunk free list
coleenp@3602 1670 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1671 slow_locked_verify();
coleenp@3602 1672 }
coleenp@3602 1673
coleenp@3602 1674 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1675 // The deallocation of a chunk originates in the freelist
coleenp@3602 1676 // manangement code for a Metaspace and does not hold the
coleenp@3602 1677 // lock.
coleenp@3602 1678 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1679 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1680 slow_locked_verify();
coleenp@3602 1681 if (TraceMetadataChunkAllocation) {
coleenp@3602 1682 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1683 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1684 chunk, chunk->word_size());
coleenp@3602 1685 }
coleenp@3602 1686 free_chunks_put(chunk);
coleenp@3602 1687 }
coleenp@3602 1688
coleenp@3602 1689 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1690 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1691
mgerdin@3829 1692 slow_locked_verify();
jmasa@3761 1693
jmasa@3761 1694 Metachunk* chunk = NULL;
jmasa@3947 1695 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1696 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1697 assert(free_list != NULL, "Sanity check");
jmasa@3761 1698
jmasa@3761 1699 chunk = free_list->head();
jmasa@3761 1700 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1701
jmasa@3761 1702 if (chunk == NULL) {
jmasa@3761 1703 return NULL;
jmasa@3761 1704 }
jmasa@3761 1705
coleenp@3602 1706 // Remove the chunk as the head of the list.
jmasa@4497 1707 free_list->remove_chunk(chunk);
jmasa@3947 1708
jmasa@3947 1709 // Chunk is being removed from the chunks free list.
jmasa@3761 1710 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1711
coleenp@3602 1712 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1713 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1714 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1715 free_list, chunk, chunk->word_size());
coleenp@3602 1716 }
coleenp@3602 1717 } else {
jmasa@3761 1718 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1719 word_size,
jmasa@3761 1720 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1721
jmasa@3761 1722 if (chunk != NULL) {
jmasa@3761 1723 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1724 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1725 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1726 " for requested size " SIZE_FORMAT
jmasa@3761 1727 " waste " SIZE_FORMAT,
jmasa@3761 1728 chunk->word_size(), word_size, waste);
coleenp@3602 1729 }
jmasa@3761 1730 // Chunk is being removed from the chunks free list.
jmasa@3761 1731 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3947 1732 } else {
jmasa@3947 1733 return NULL;
coleenp@3602 1734 }
coleenp@3602 1735 }
jmasa@3947 1736
jmasa@3947 1737 // Remove it from the links to this freelist
jmasa@3947 1738 chunk->set_next(NULL);
jmasa@3947 1739 chunk->set_prev(NULL);
jmasa@4572 1740 #ifdef ASSERT
jmasa@4572 1741 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
jmasa@4572 1742 // work.
jmasa@4572 1743 chunk->set_is_free(false);
jmasa@4572 1744 #endif
mgerdin@3829 1745 slow_locked_verify();
coleenp@3602 1746 return chunk;
coleenp@3602 1747 }
coleenp@3602 1748
coleenp@3602 1749 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1750 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1751 slow_locked_verify();
coleenp@3602 1752
coleenp@3602 1753 // Take from the beginning of the list
coleenp@3602 1754 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1755 if (chunk == NULL) {
coleenp@3602 1756 return NULL;
coleenp@3602 1757 }
coleenp@3602 1758
jmasa@3947 1759 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1760 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1761 "Non-humongous variable sized chunk");
coleenp@3602 1762 if (TraceMetadataChunkAllocation) {
jmasa@3947 1763 size_t list_count;
jmasa@3947 1764 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1765 ChunkList* list = find_free_chunks_list(word_size);
jmasa@4497 1766 list_count = list->count();
jmasa@3947 1767 } else {
jmasa@3947 1768 list_count = humongous_dictionary()->total_count();
jmasa@3947 1769 }
jmasa@3947 1770 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1771 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1772 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1773 locked_print_free_chunks(tty);
coleenp@3602 1774 }
coleenp@3602 1775
coleenp@3602 1776 return chunk;
coleenp@3602 1777 }
coleenp@3602 1778
jmasa@3761 1779 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1780 if (PrintFLSStatistics != 0) {
jmasa@3761 1781 humongous_dictionary()->report_statistics();
jmasa@3761 1782 }
jmasa@3761 1783 }
jmasa@3761 1784
coleenp@3602 1785 // SpaceManager methods
coleenp@3602 1786
jmasa@3947 1787 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1788 size_t* chunk_word_size,
jmasa@3947 1789 size_t* class_chunk_word_size) {
jmasa@3947 1790 switch (type) {
jmasa@3947 1791 case Metaspace::BootMetaspaceType:
jmasa@3947 1792 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1793 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1794 break;
jmasa@3947 1795 case Metaspace::ROMetaspaceType:
jmasa@3947 1796 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1797 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1798 break;
jmasa@3947 1799 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1800 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1801 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1802 break;
jmasa@3947 1803 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1804 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1805 *chunk_word_size = SpecializedChunk;
jmasa@3947 1806 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1807 break;
jmasa@3947 1808 default:
jmasa@3947 1809 *chunk_word_size = SmallChunk;
jmasa@3947 1810 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1811 break;
jmasa@3947 1812 }
mikael@4113 1813 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1814 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1815 " class " SIZE_FORMAT,
mikael@4113 1816 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1817 }
jmasa@3947 1818
coleenp@3602 1819 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1820 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1821 size_t free = 0;
jmasa@3947 1822 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1823 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1824 while (chunk != NULL) {
coleenp@3602 1825 free += chunk->free_word_size();
coleenp@3602 1826 chunk = chunk->next();
coleenp@3602 1827 }
coleenp@3602 1828 }
coleenp@3602 1829 return free;
coleenp@3602 1830 }
coleenp@3602 1831
coleenp@3602 1832 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1833 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1834 size_t result = 0;
jmasa@3947 1835 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1836 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1837 }
jmasa@3761 1838
coleenp@3602 1839 return result;
coleenp@3602 1840 }
coleenp@3602 1841
coleenp@3602 1842 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1843 size_t result = 0;
coleenp@3602 1844 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1845 // Count the free space in all the chunk but not the
coleenp@3602 1846 // current chunk from which allocations are still being done.
coleenp@3602 1847 if (chunk != NULL) {
jmasa@3761 1848 Metachunk* prev = chunk;
jmasa@3761 1849 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1850 result += chunk->free_word_size();
jmasa@3761 1851 prev = chunk;
coleenp@3602 1852 chunk = chunk->next();
coleenp@3602 1853 }
coleenp@3602 1854 }
coleenp@3602 1855 return result;
coleenp@3602 1856 }
coleenp@3602 1857
coleenp@3602 1858 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
jmasa@4580 1859 // For CMS use "allocated_chunks_words()" which does not need the
jmasa@4580 1860 // Metaspace lock. For the other collectors sum over the
jmasa@4580 1861 // lists. Use both methods as a check that "allocated_chunks_words()"
jmasa@4580 1862 // is correct. That is, sum_capacity_in_chunks() is too expensive
jmasa@4580 1863 // to use in the product and allocated_chunks_words() should be used
jmasa@4580 1864 // but allow for checking that allocated_chunks_words() returns the same
jmasa@4580 1865 // value as sum_capacity_in_chunks_in_use() which is the definitive
jmasa@4580 1866 // answer.
jmasa@4580 1867 if (UseConcMarkSweepGC) {
jmasa@4580 1868 return allocated_chunks_words();
jmasa@4580 1869 } else {
jmasa@4580 1870 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
jmasa@4580 1871 size_t sum = 0;
jmasa@4580 1872 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@4580 1873 Metachunk* chunk = chunks_in_use(i);
jmasa@4580 1874 while (chunk != NULL) {
jmasa@4580 1875 sum += chunk->capacity_word_size();
jmasa@4580 1876 chunk = chunk->next();
jmasa@4580 1877 }
coleenp@3602 1878 }
jmasa@4580 1879 return sum;
coleenp@3602 1880 }
coleenp@3602 1881 }
coleenp@3602 1882
coleenp@3602 1883 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1884 size_t count = 0;
jmasa@3947 1885 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1886 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1887 }
jmasa@3761 1888
coleenp@3602 1889 return count;
coleenp@3602 1890 }
coleenp@3602 1891
coleenp@3602 1892 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1893 size_t count = 0;
coleenp@3602 1894 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1895 while (chunk != NULL) {
coleenp@3602 1896 count++;
coleenp@3602 1897 chunk = chunk->next();
coleenp@3602 1898 }
coleenp@3602 1899 return count;
coleenp@3602 1900 }
coleenp@3602 1901
coleenp@3602 1902
coleenp@3602 1903 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1904 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1905 size_t used = 0;
jmasa@3947 1906 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1907 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1908 while (chunk != NULL) {
coleenp@3602 1909 used += chunk->used_word_size();
coleenp@3602 1910 chunk = chunk->next();
coleenp@3602 1911 }
coleenp@3602 1912 }
coleenp@3602 1913 return used;
coleenp@3602 1914 }
coleenp@3602 1915
coleenp@3602 1916 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1917
jmasa@3947 1918 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1919 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1920 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1921 chunk_size_name(i), chunk);
jmasa@3947 1922 if (chunk != NULL) {
jmasa@3947 1923 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1924 chunk->free_word_size());
jmasa@3947 1925 } else {
jmasa@3947 1926 st->print_cr("");
jmasa@3947 1927 }
jmasa@3947 1928 }
coleenp@3602 1929
coleenp@3602 1930 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1931 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1932 }
coleenp@3602 1933
coleenp@3602 1934 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1935
coleenp@3602 1936 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1937 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1938 // once a medium chunk has been allocated, no more small
coleenp@3602 1939 // chunks will be allocated.
coleenp@3602 1940 size_t chunk_word_size;
coleenp@3602 1941 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1942 (!has_small_chunk_limit() ||
coleenp@3602 1943 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
jmasa@3947 1944 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1945 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1946 chunk_word_size = medium_chunk_size();
coleenp@3602 1947 }
coleenp@3602 1948 } else {
jmasa@3947 1949 chunk_word_size = medium_chunk_size();
coleenp@3602 1950 }
coleenp@3602 1951
jmasa@3947 1952 // Might still need a humongous chunk. Enforce an
jmasa@3947 1953 // eight word granularity to facilitate reuse (some
jmasa@3947 1954 // wastage but better chance of reuse).
jmasa@3947 1955 size_t if_humongous_sized_chunk =
jmasa@3947 1956 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1957 HumongousChunkGranularity);
coleenp@3602 1958 chunk_word_size =
jmasa@3947 1959 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1960
jmasa@3947 1961 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1962 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1963 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1964 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1965 word_size, chunk_word_size));
coleenp@3602 1966 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1967 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1968 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1969 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1970 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1971 chunk_word_size);
jmasa@3761 1972 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1973 Metachunk::overhead());
coleenp@3602 1974 }
coleenp@3602 1975 return chunk_word_size;
coleenp@3602 1976 }
coleenp@3602 1977
jmasa@3761 1978 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1979 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1980 "Should have been set");
coleenp@3602 1981 assert(current_chunk() == NULL ||
coleenp@3602 1982 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1983 "Don't need to expand");
coleenp@3602 1984 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1985
coleenp@3602 1986 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1987 size_t words_left = 0;
jmasa@3947 1988 size_t words_used = 0;
jmasa@3947 1989 if (current_chunk() != NULL) {
jmasa@3947 1990 words_left = current_chunk()->free_word_size();
jmasa@3947 1991 words_used = current_chunk()->used_word_size();
jmasa@3947 1992 }
coleenp@3602 1993 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 1994 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 1995 " words left",
jmasa@3947 1996 word_size, words_used, words_left);
coleenp@3602 1997 }
coleenp@3602 1998
coleenp@3602 1999 // Get another chunk out of the virtual space
coleenp@3602 2000 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 2001 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 2002
coleenp@3602 2003 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 2004 // and do an allocation from it.
coleenp@3602 2005 if (next != NULL) {
coleenp@3602 2006 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 2007 // Add to this manager's list of chunks in use.
coleenp@3602 2008 add_chunk(next, false);
coleenp@3602 2009 return next->allocate(word_size);
coleenp@3602 2010 }
coleenp@3602 2011 return NULL;
coleenp@3602 2012 }
coleenp@3602 2013
coleenp@3602 2014 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 2015
jmasa@3947 2016 for (ChunkIndex i = ZeroIndex;
jmasa@3761 2017 i < NumberOfInUseLists ;
coleenp@3602 2018 i = next_chunk_index(i) ) {
coleenp@3602 2019 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 2020 chunks_in_use(i),
coleenp@3602 2021 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 2022 }
coleenp@3602 2023 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 2024 " Humongous " SIZE_FORMAT,
coleenp@3602 2025 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 2026 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 2027 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 2028 // block free lists
jmasa@3761 2029 if (block_freelists() != NULL) {
jmasa@3761 2030 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 2031 block_freelists()->total_size());
jmasa@3761 2032 }
coleenp@3602 2033 }
coleenp@3602 2034
jmasa@3947 2035 SpaceManager::SpaceManager(Mutex* lock,
jmasa@3947 2036 VirtualSpaceList* vs_list) :
coleenp@3602 2037 _vs_list(vs_list),
jmasa@4580 2038 _allocated_blocks_words(0),
jmasa@4580 2039 _allocated_chunks_words(0),
jmasa@4580 2040 _allocated_chunks_count(0),
jmasa@3947 2041 _lock(lock)
jmasa@3947 2042 {
jmasa@3947 2043 initialize();
jmasa@3947 2044 }
jmasa@3947 2045
jmasa@4580 2046 void SpaceManager::inc_size_metrics(size_t words) {
jmasa@4580 2047 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2048 // Total of allocated Metachunks and allocated Metachunks count
jmasa@4580 2049 // for each SpaceManager
jmasa@4580 2050 _allocated_chunks_words = _allocated_chunks_words + words;
jmasa@4580 2051 _allocated_chunks_count++;
jmasa@4580 2052 // Global total of capacity in allocated Metachunks
jmasa@4580 2053 MetaspaceAux::inc_capacity(words);
jmasa@4580 2054 // Global total of allocated Metablocks.
jmasa@4580 2055 // used_words_slow() includes the overhead in each
jmasa@4580 2056 // Metachunk so include it in the used when the
jmasa@4580 2057 // Metachunk is first added (so only added once per
jmasa@4580 2058 // Metachunk).
jmasa@4580 2059 MetaspaceAux::inc_used(Metachunk::overhead());
jmasa@4580 2060 }
jmasa@4580 2061
jmasa@4580 2062 void SpaceManager::inc_used_metrics(size_t words) {
jmasa@4580 2063 // Add to the per SpaceManager total
jmasa@4580 2064 Atomic::add_ptr(words, &_allocated_blocks_words);
jmasa@4580 2065 // Add to the global total
jmasa@4580 2066 MetaspaceAux::inc_used(words);
jmasa@4580 2067 }
jmasa@4580 2068
jmasa@4580 2069 void SpaceManager::dec_total_from_size_metrics() {
jmasa@4580 2070 MetaspaceAux::dec_capacity(allocated_chunks_words());
jmasa@4580 2071 MetaspaceAux::dec_used(allocated_blocks_words());
jmasa@4580 2072 // Also deduct the overhead per Metachunk
jmasa@4580 2073 MetaspaceAux::dec_used(allocated_chunks_count() * Metachunk::overhead());
jmasa@4580 2074 }
jmasa@4580 2075
jmasa@3947 2076 void SpaceManager::initialize() {
coleenp@3602 2077 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 2078 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2079 _chunks_in_use[i] = NULL;
coleenp@3602 2080 }
coleenp@3602 2081 _current_chunk = NULL;
coleenp@3602 2082 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2083 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2084 }
coleenp@3602 2085 }
coleenp@3602 2086
jmasa@4497 2087 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
jmasa@4497 2088 if (chunks == NULL) {
jmasa@4497 2089 return;
jmasa@4497 2090 }
jmasa@4497 2091 ChunkList* list = free_chunks(index);
jmasa@4497 2092 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
jmasa@4497 2093 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4497 2094 Metachunk* cur = chunks;
jmasa@4497 2095
jmasa@4572 2096 // This returns chunks one at a time. If a new
jmasa@4497 2097 // class List can be created that is a base class
jmasa@4497 2098 // of FreeList then something like FreeList::prepend()
jmasa@4497 2099 // can be used in place of this loop
jmasa@4497 2100 while (cur != NULL) {
jmasa@4572 2101 assert(cur->container() != NULL, "Container should have been set");
jmasa@4572 2102 cur->container()->dec_container_count();
jmasa@4497 2103 // Capture the next link before it is changed
jmasa@4497 2104 // by the call to return_chunk_at_head();
jmasa@4497 2105 Metachunk* next = cur->next();
jmasa@4497 2106 cur->set_is_free(true);
jmasa@4497 2107 list->return_chunk_at_head(cur);
jmasa@4497 2108 cur = next;
jmasa@4497 2109 }
jmasa@4497 2110 }
jmasa@4497 2111
coleenp@3602 2112 SpaceManager::~SpaceManager() {
mgerdin@4349 2113 // This call this->_lock which can't be done while holding expand_lock()
jmasa@4580 2114 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
jmasa@4580 2115 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
jmasa@4580 2116 " allocated_chunks_words() " SIZE_FORMAT,
jmasa@4580 2117 sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
mgerdin@4349 2118
coleenp@3602 2119 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 2120 Mutex::_no_safepoint_check_flag);
coleenp@3602 2121
coleenp@3602 2122 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 2123
mgerdin@3829 2124 chunk_manager->slow_locked_verify();
coleenp@3602 2125
jmasa@4580 2126 dec_total_from_size_metrics();
jmasa@4580 2127
coleenp@3602 2128 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2129 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2130 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 2131 }
coleenp@3602 2132
jmasa@4572 2133 // Do not mangle freed Metachunks. The chunk size inside Metachunks
jmasa@4572 2134 // is during the freeing of a VirtualSpaceNodes.
coleenp@3869 2135
coleenp@3602 2136 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 2137 // below.
jmasa@4580 2138 chunk_manager->inc_free_chunks_total(allocated_chunks_words(),
coleenp@3602 2139 sum_count_in_chunks_in_use());
coleenp@3602 2140
coleenp@3602 2141 // Add all the chunks in use by this space manager
coleenp@3602 2142 // to the global list of free chunks.
coleenp@3602 2143
jmasa@3947 2144 // Follow each list of chunks-in-use and add them to the
jmasa@3947 2145 // free lists. Each list is NULL terminated.
jmasa@3947 2146
jmasa@3947 2147 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 2148 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2149 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 2150 sum_count_in_chunks_in_use(i),
jmasa@3947 2151 chunk_size_name(i));
jmasa@3947 2152 }
jmasa@3947 2153 Metachunk* chunks = chunks_in_use(i);
jmasa@4497 2154 chunk_manager->return_chunks(i, chunks);
jmasa@3947 2155 set_chunks_in_use(i, NULL);
jmasa@3947 2156 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2157 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@4497 2158 chunk_manager->free_chunks(i)->count(),
jmasa@3947 2159 chunk_size_name(i));
jmasa@3947 2160 }
jmasa@3947 2161 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 2162 }
coleenp@3602 2163
jmasa@3947 2164 // The medium chunk case may be optimized by passing the head and
jmasa@3947 2165 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 2166 // the current chunk but there are probably exceptions.
jmasa@3947 2167
coleenp@3602 2168 // Humongous chunks
jmasa@3947 2169 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2170 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 2171 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 2172 chunk_size_name(HumongousIndex));
jmasa@3947 2173 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 2174 }
coleenp@3602 2175 // Humongous chunks are never the current chunk.
coleenp@3602 2176 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2177
jmasa@3761 2178 while (humongous_chunks != NULL) {
jmasa@3761 2179 #ifdef ASSERT
jmasa@3761 2180 humongous_chunks->set_is_free(true);
jmasa@3761 2181 #endif
jmasa@3947 2182 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2183 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 2184 humongous_chunks,
jmasa@3947 2185 humongous_chunks->word_size());
jmasa@3947 2186 }
jmasa@3947 2187 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 2188 align_size_up(humongous_chunks->word_size(),
jmasa@3947 2189 HumongousChunkGranularity),
jmasa@3947 2190 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 2191 " granularity %d",
jmasa@3947 2192 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 2193 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@4572 2194 humongous_chunks->container()->dec_container_count();
jmasa@3761 2195 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2196 humongous_chunks = next_humongous_chunks;
coleenp@3602 2197 }
jmasa@3947 2198 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2199 gclog_or_tty->print_cr("");
jmasa@3947 2200 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 2201 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 2202 chunk_size_name(HumongousIndex));
jmasa@3947 2203 }
mgerdin@3829 2204 chunk_manager->slow_locked_verify();
coleenp@3602 2205 }
coleenp@3602 2206
jmasa@3947 2207 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 2208 switch (index) {
jmasa@3947 2209 case SpecializedIndex:
jmasa@3947 2210 return "Specialized";
jmasa@3947 2211 case SmallIndex:
jmasa@3947 2212 return "Small";
jmasa@3947 2213 case MediumIndex:
jmasa@3947 2214 return "Medium";
jmasa@3947 2215 case HumongousIndex:
jmasa@3947 2216 return "Humongous";
jmasa@3947 2217 default:
jmasa@3947 2218 return NULL;
jmasa@3947 2219 }
jmasa@3947 2220 }
jmasa@3947 2221
jmasa@3947 2222 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2223 switch (size) {
jmasa@3947 2224 case SpecializedChunk:
jmasa@3947 2225 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2226 "Need branch for ClassSpecializedChunk");
jmasa@3947 2227 return SpecializedIndex;
jmasa@3947 2228 case SmallChunk:
jmasa@3947 2229 case ClassSmallChunk:
jmasa@3947 2230 return SmallIndex;
jmasa@3947 2231 case MediumChunk:
jmasa@3947 2232 case ClassMediumChunk:
jmasa@3947 2233 return MediumIndex;
jmasa@3947 2234 default:
jmasa@3948 2235 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2236 "Not a humongous chunk");
jmasa@3947 2237 return HumongousIndex;
jmasa@3947 2238 }
jmasa@3947 2239 }
jmasa@3947 2240
jmasa@3761 2241 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2242 assert_lock_strong(_lock);
jmasa@3761 2243 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2244 assert(word_size >= min_size,
jmasa@3761 2245 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2246 block_freelists()->return_block(p, word_size);
coleenp@3602 2247 }
coleenp@3602 2248
coleenp@3602 2249 // Adds a chunk to the list of chunks in use.
coleenp@3602 2250 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2251
coleenp@3602 2252 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2253 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2254
coleenp@3602 2255 new_chunk->reset_empty();
coleenp@3602 2256
coleenp@3602 2257 // Find the correct list and and set the current
coleenp@3602 2258 // chunk for that list.
jmasa@3947 2259 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2260
jmasa@3947 2261 if (index != HumongousIndex) {
coleenp@3602 2262 set_current_chunk(new_chunk);
jmasa@3947 2263 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2264 set_chunks_in_use(index, new_chunk);
jmasa@3947 2265 } else {
coleenp@3602 2266 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2267 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2268 // chunk.
coleenp@3602 2269 if (make_current) {
coleenp@3602 2270 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2271 set_current_chunk(new_chunk);
coleenp@3602 2272 }
coleenp@3602 2273 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2274 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2275 // any humongous chunks so will not point to the tail
coleenp@3602 2276 // of the humongous chunks list.
coleenp@3602 2277 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2278 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2279
jmasa@3948 2280 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2281 }
coleenp@3602 2282
jmasa@4580 2283 // Add to the running sum of capacity
jmasa@4580 2284 inc_size_metrics(new_chunk->word_size());
jmasa@4580 2285
coleenp@3602 2286 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2287 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2288 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2289 sum_count_in_chunks_in_use());
coleenp@3602 2290 new_chunk->print_on(gclog_or_tty);
jmasa@4580 2291 if (vs_list() != NULL) {
jmasa@4580 2292 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
jmasa@4580 2293 }
coleenp@3602 2294 }
coleenp@3602 2295 }
coleenp@3602 2296
jmasa@3947 2297 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2298 size_t grow_chunks_by_words) {
jmasa@3947 2299
jmasa@3947 2300 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2301 grow_chunks_by_words,
jmasa@3947 2302 medium_chunk_bunch());
jmasa@3947 2303
jmasa@3947 2304 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2305 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2306 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2307 next->word_size());
jmasa@3947 2308 }
jmasa@3947 2309
jmasa@3947 2310 return next;
jmasa@3947 2311 }
jmasa@3947 2312
coleenp@3602 2313 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2314 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2315
coleenp@3602 2316 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2317 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2318 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2319 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2320
jmasa@3761 2321 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2322
jmasa@3761 2323 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2324 Metablock::min_block_byte_size());
jmasa@3761 2325 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2326 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2327 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2328
coleenp@3602 2329 BlockFreelist* fl = block_freelists();
jmasa@3761 2330 MetaWord* p = NULL;
coleenp@3602 2331 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2332 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2333 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2334 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2335 // for allocations. Do some profiling. JJJ
jmasa@3761 2336 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2337 p = fl->get_block(raw_word_size);
coleenp@3602 2338 }
jmasa@3761 2339 if (p == NULL) {
jmasa@3761 2340 p = allocate_work(raw_word_size);
coleenp@3602 2341 }
coleenp@3602 2342 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2343
jmasa@3761 2344 return p;
coleenp@3602 2345 }
coleenp@3602 2346
coleenp@3602 2347 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2348 // This methods does not know about blocks (Metablocks)
jmasa@3761 2349 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2350 assert_lock_strong(_lock);
coleenp@3602 2351 #ifdef ASSERT
coleenp@3602 2352 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2353 return NULL;
coleenp@3602 2354 }
coleenp@3602 2355 #endif
coleenp@3602 2356 // Is there space in the current chunk?
jmasa@3761 2357 MetaWord* result = NULL;
coleenp@3602 2358
coleenp@3602 2359 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2360 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2361 // of memory if this returns null.
coleenp@3602 2362 if (DumpSharedSpaces) {
coleenp@3602 2363 assert(current_chunk() != NULL, "should never happen");
jmasa@4580 2364 inc_used_metrics(word_size);
coleenp@3602 2365 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2366 }
coleenp@3602 2367 if (current_chunk() != NULL) {
coleenp@3602 2368 result = current_chunk()->allocate(word_size);
coleenp@3602 2369 }
coleenp@3602 2370
coleenp@3602 2371 if (result == NULL) {
coleenp@3602 2372 result = grow_and_allocate(word_size);
coleenp@3602 2373 }
coleenp@3602 2374 if (result > 0) {
jmasa@4580 2375 inc_used_metrics(word_size);
jmasa@3761 2376 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2377 "Head of the list is being allocated");
coleenp@3602 2378 }
coleenp@3602 2379
coleenp@3602 2380 return result;
coleenp@3602 2381 }
coleenp@3602 2382
coleenp@3602 2383 void SpaceManager::verify() {
coleenp@3602 2384 // If there are blocks in the dictionary, then
coleenp@3602 2385 // verfication of chunks does not work since
coleenp@3602 2386 // being in the dictionary alters a chunk.
jmasa@3761 2387 if (block_freelists()->total_size() == 0) {
jmasa@3947 2388 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2389 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2390 while (curr != NULL) {
coleenp@3602 2391 curr->verify();
jmasa@3892 2392 verify_chunk_size(curr);
coleenp@3602 2393 curr = curr->next();
coleenp@3602 2394 }
coleenp@3602 2395 }
coleenp@3602 2396 }
coleenp@3602 2397 }
coleenp@3602 2398
jmasa@3892 2399 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2400 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2401 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2402 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2403 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2404 "Chunk size is wrong");
jmasa@3892 2405 return;
jmasa@3892 2406 }
jmasa@3892 2407
coleenp@3602 2408 #ifdef ASSERT
jmasa@4580 2409 void SpaceManager::verify_allocated_blocks_words() {
coleenp@3602 2410 // Verification is only guaranteed at a safepoint.
jmasa@4580 2411 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
jmasa@4580 2412 "Verification can fail if the applications is running");
jmasa@4580 2413 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
mikael@4113 2414 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2415 " vs " SIZE_FORMAT,
jmasa@4580 2416 allocated_blocks_words(), sum_used_in_chunks_in_use()));
coleenp@3602 2417 }
coleenp@3602 2418
coleenp@3602 2419 #endif
coleenp@3602 2420
coleenp@3602 2421 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2422 size_t curr_total = 0;
coleenp@3602 2423 size_t waste = 0;
coleenp@3602 2424 uint i = 0;
coleenp@3602 2425 size_t used = 0;
coleenp@3602 2426 size_t capacity = 0;
coleenp@3602 2427
coleenp@3602 2428 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2429 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2430 index < NumberOfInUseLists;
coleenp@3602 2431 index = next_chunk_index(index)) {
coleenp@3602 2432 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2433 curr != NULL;
coleenp@3602 2434 curr = curr->next()) {
coleenp@3602 2435 out->print("%d) ", i++);
coleenp@3602 2436 curr->print_on(out);
coleenp@3602 2437 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2438 block_freelists()->print_on(out);
coleenp@3602 2439 }
coleenp@3602 2440 curr_total += curr->word_size();
coleenp@3602 2441 used += curr->used_word_size();
coleenp@3602 2442 capacity += curr->capacity_word_size();
coleenp@3602 2443 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2444 }
coleenp@3602 2445 }
coleenp@3602 2446
jmasa@3947 2447 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2448 // Free space isn't wasted.
coleenp@3602 2449 waste -= free;
coleenp@3602 2450
coleenp@3602 2451 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2452 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2453 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2454 }
coleenp@3602 2455
coleenp@3869 2456 #ifndef PRODUCT
coleenp@3602 2457 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2458 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2459 index < NumberOfInUseLists;
coleenp@3602 2460 index = next_chunk_index(index)) {
coleenp@3602 2461 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2462 curr != NULL;
coleenp@3602 2463 curr = curr->next()) {
coleenp@3602 2464 curr->mangle();
coleenp@3602 2465 }
coleenp@3602 2466 }
coleenp@3602 2467 }
coleenp@3869 2468 #endif // PRODUCT
coleenp@3602 2469
coleenp@3602 2470 // MetaspaceAux
coleenp@3602 2471
jmasa@4580 2472
jmasa@4580 2473 size_t MetaspaceAux::_allocated_capacity_words = 0;
jmasa@4580 2474 size_t MetaspaceAux::_allocated_used_words = 0;
jmasa@4580 2475
jmasa@4580 2476 size_t MetaspaceAux::free_bytes() {
jmasa@4580 2477 size_t result = 0;
jmasa@4580 2478 if (Metaspace::class_space_list() != NULL) {
jmasa@4580 2479 result = result + Metaspace::class_space_list()->free_bytes();
jmasa@4580 2480 }
jmasa@4580 2481 if (Metaspace::space_list() != NULL) {
jmasa@4580 2482 result = result + Metaspace::space_list()->free_bytes();
jmasa@4580 2483 }
jmasa@4580 2484 return result;
jmasa@4580 2485 }
jmasa@4580 2486
jmasa@4580 2487 void MetaspaceAux::dec_capacity(size_t words) {
jmasa@4580 2488 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2489 assert(words <= _allocated_capacity_words,
jmasa@4580 2490 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4580 2491 " is greater than _allocated_capacity_words " SIZE_FORMAT,
jmasa@4580 2492 words, _allocated_capacity_words));
jmasa@4580 2493 _allocated_capacity_words = _allocated_capacity_words - words;
jmasa@4580 2494 }
jmasa@4580 2495
jmasa@4580 2496 void MetaspaceAux::inc_capacity(size_t words) {
jmasa@4580 2497 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2498 // Needs to be atomic
jmasa@4580 2499 _allocated_capacity_words = _allocated_capacity_words + words;
jmasa@4580 2500 }
jmasa@4580 2501
jmasa@4580 2502 void MetaspaceAux::dec_used(size_t words) {
jmasa@4580 2503 assert(words <= _allocated_used_words,
jmasa@4580 2504 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4580 2505 " is greater than _allocated_used_words " SIZE_FORMAT,
jmasa@4580 2506 words, _allocated_used_words));
jmasa@4580 2507 // For CMS deallocation of the Metaspaces occurs during the
jmasa@4580 2508 // sweep which is a concurrent phase. Protection by the expand_lock()
jmasa@4580 2509 // is not enough since allocation is on a per Metaspace basis
jmasa@4580 2510 // and protected by the Metaspace lock.
jmasa@4580 2511 jlong minus_words = (jlong) - (jlong) words;
jmasa@4580 2512 Atomic::add_ptr(minus_words, &_allocated_used_words);
jmasa@4580 2513 }
jmasa@4580 2514
jmasa@4580 2515 void MetaspaceAux::inc_used(size_t words) {
jmasa@4580 2516 // _allocated_used_words tracks allocations for
jmasa@4580 2517 // each piece of metadata. Those allocations are
jmasa@4580 2518 // generally done concurrently by different application
jmasa@4580 2519 // threads so must be done atomically.
jmasa@4580 2520 Atomic::add_ptr(words, &_allocated_used_words);
jmasa@4580 2521 }
jmasa@4580 2522
jmasa@4580 2523 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@3607 2524 size_t used = 0;
jmasa@3607 2525 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2526 while (iter.repeat()) {
jmasa@3607 2527 Metaspace* msp = iter.get_next();
jmasa@4580 2528 // Sum allocated_blocks_words for each metaspace
jmasa@3607 2529 if (msp != NULL) {
jmasa@4580 2530 used += msp->used_words_slow(mdtype);
jmasa@3607 2531 }
jmasa@3607 2532 }
jmasa@3607 2533 return used * BytesPerWord;
jmasa@3607 2534 }
jmasa@3607 2535
coleenp@3602 2536 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2537 size_t free = 0;
coleenp@3602 2538 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2539 while (iter.repeat()) {
coleenp@3602 2540 Metaspace* msp = iter.get_next();
coleenp@3602 2541 if (msp != NULL) {
coleenp@3602 2542 free += msp->free_words(mdtype);
coleenp@3602 2543 }
coleenp@3602 2544 }
coleenp@3602 2545 return free * BytesPerWord;
coleenp@3602 2546 }
coleenp@3602 2547
jmasa@4580 2548 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@4580 2549 // Don't count the space in the freelists. That space will be
jmasa@4580 2550 // added to the capacity calculation as needed.
jmasa@4580 2551 size_t capacity = 0;
coleenp@3602 2552 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2553 while (iter.repeat()) {
coleenp@3602 2554 Metaspace* msp = iter.get_next();
coleenp@3602 2555 if (msp != NULL) {
jmasa@4580 2556 capacity += msp->capacity_words_slow(mdtype);
coleenp@3602 2557 }
coleenp@3602 2558 }
coleenp@3602 2559 return capacity * BytesPerWord;
coleenp@3602 2560 }
coleenp@3602 2561
coleenp@3602 2562 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2563 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2564 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2565 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2566 return reserved * BytesPerWord;
coleenp@3602 2567 }
coleenp@3602 2568
jmasa@3947 2569 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
coleenp@3602 2570
coleenp@3602 2571 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2572 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2573 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2574 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2575 chunk->slow_verify();
coleenp@3602 2576 return chunk->free_chunks_total();
coleenp@3602 2577 }
coleenp@3602 2578
coleenp@3602 2579 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2580 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2581 }
coleenp@3602 2582
jmasa@4580 2583 size_t MetaspaceAux::free_chunks_total() {
jmasa@4580 2584 return free_chunks_total(Metaspace::ClassType) +
jmasa@4580 2585 free_chunks_total(Metaspace::NonClassType);
jmasa@4580 2586 }
jmasa@4580 2587
jmasa@4580 2588 size_t MetaspaceAux::free_chunks_total_in_bytes() {
jmasa@4580 2589 return free_chunks_total() * BytesPerWord;
jmasa@4580 2590 }
jmasa@4580 2591
coleenp@3602 2592 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2593 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2594 if (PrintGCDetails && Verbose) {
coleenp@3602 2595 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2596 "->" SIZE_FORMAT
jmasa@4580 2597 "(" SIZE_FORMAT ")",
coleenp@3602 2598 prev_metadata_used,
jmasa@4580 2599 allocated_capacity_bytes(),
coleenp@3602 2600 reserved_in_bytes());
coleenp@3602 2601 } else {
coleenp@3602 2602 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2603 "->" SIZE_FORMAT "K"
jmasa@4580 2604 "(" SIZE_FORMAT "K)",
coleenp@3602 2605 prev_metadata_used / K,
jmasa@4580 2606 allocated_capacity_bytes() / K,
coleenp@3602 2607 reserved_in_bytes()/ K);
coleenp@3602 2608 }
coleenp@3602 2609
coleenp@3602 2610 gclog_or_tty->print("]");
coleenp@3602 2611 }
coleenp@3602 2612
coleenp@3602 2613 // This is printed when PrintGCDetails
coleenp@3602 2614 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2615 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2616 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2617
coleenp@3602 2618 out->print_cr(" Metaspace total "
coleenp@3602 2619 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2620 " reserved " SIZE_FORMAT "K",
jmasa@4580 2621 allocated_capacity_bytes()/K, allocated_used_bytes()/K, reserved_in_bytes()/K);
jmasa@4580 2622 #if 0
jmasa@4580 2623 // The calls to capacity_bytes_slow() and used_bytes_slow() cause
jmasa@4580 2624 // lock ordering assertion failures with some collectors. Do
jmasa@4580 2625 // not include this code until the lock ordering is fixed.
jmasa@4580 2626 if (PrintGCDetails && Verbose) {
jmasa@4580 2627 out->print_cr(" data space "
jmasa@4580 2628 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4580 2629 " reserved " SIZE_FORMAT "K",
jmasa@4580 2630 capacity_bytes_slow(nct)/K, used_bytes_slow(nct)/K, reserved_in_bytes(nct)/K);
jmasa@4580 2631 out->print_cr(" class space "
jmasa@4580 2632 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4580 2633 " reserved " SIZE_FORMAT "K",
jmasa@4580 2634 capacity_bytes_slow(ct)/K, used_bytes_slow(ct)/K, reserved_in_bytes(ct)/K);
jmasa@4580 2635 }
jmasa@4580 2636 #endif
coleenp@3602 2637 }
coleenp@3602 2638
coleenp@3602 2639 // Print information for class space and data space separately.
coleenp@3602 2640 // This is almost the same as above.
coleenp@3602 2641 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2642 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
jmasa@4580 2643 size_t capacity_bytes = capacity_bytes_slow(mdtype);
jmasa@4580 2644 size_t used_bytes = used_bytes_slow(mdtype);
coleenp@3602 2645 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2646 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2647 free_chunks_capacity_bytes;
coleenp@3602 2648 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2649 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2650 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2651 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2652 used_bytes / K,
coleenp@3602 2653 free_bytes / K,
coleenp@3602 2654 free_chunks_capacity_bytes / K,
coleenp@3602 2655 used_and_free / K,
coleenp@3602 2656 capacity_bytes / K);
mgerdin@4303 2657 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2658 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2659 }
coleenp@3602 2660
coleenp@3602 2661 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2662 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2663
jmasa@3947 2664 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0;
jmasa@3947 2665 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0;
jmasa@3947 2666 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
jmasa@3947 2667 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0;
coleenp@3602 2668
coleenp@3602 2669 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2670 while (iter.repeat()) {
coleenp@3602 2671 Metaspace* msp = iter.get_next();
coleenp@3602 2672 if (msp != NULL) {
jmasa@3947 2673 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2674 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2675 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2676 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2677 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2678 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2679 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2680 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
jmasa@3947 2681
jmasa@3947 2682 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2683 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2684 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2685 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2686 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2687 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2688 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2689 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2690 }
coleenp@3602 2691 }
coleenp@3602 2692 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2693 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2694 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
jmasa@3947 2695 SIZE_FORMAT " medium(s) " SIZE_FORMAT,
jmasa@3947 2696 specialized_count, specialized_waste, small_count,
jmasa@3947 2697 small_waste, medium_count, medium_waste);
jmasa@3947 2698 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2699 SIZE_FORMAT " small(s) " SIZE_FORMAT,
jmasa@3947 2700 cls_specialized_count, cls_specialized_waste,
jmasa@3947 2701 cls_small_count, cls_small_waste);
coleenp@3602 2702 }
coleenp@3602 2703
coleenp@3602 2704 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2705 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2706 out->print_cr("All Metaspace:");
coleenp@3602 2707 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2708 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2709 print_waste(out);
coleenp@3602 2710 }
coleenp@3602 2711
mgerdin@3829 2712 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2713 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2714 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2715 }
mgerdin@3829 2716
jmasa@4580 2717 void MetaspaceAux::verify_capacity() {
jmasa@4580 2718 #ifdef ASSERT
jmasa@4580 2719 size_t running_sum_capacity_bytes = allocated_capacity_bytes();
jmasa@4580 2720 // For purposes of the running sum of used, verify against capacity
jmasa@4580 2721 size_t capacity_in_use_bytes = capacity_bytes_slow();
jmasa@4580 2722 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
jmasa@4580 2723 err_msg("allocated_capacity_words() * BytesPerWord " SIZE_FORMAT
jmasa@4580 2724 " capacity_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2725 running_sum_capacity_bytes, capacity_in_use_bytes));
jmasa@4580 2726 #endif
jmasa@4580 2727 }
jmasa@4580 2728
jmasa@4580 2729 void MetaspaceAux::verify_used() {
jmasa@4580 2730 #ifdef ASSERT
jmasa@4580 2731 size_t running_sum_used_bytes = allocated_used_bytes();
jmasa@4580 2732 // For purposes of the running sum of used, verify against capacity
jmasa@4580 2733 size_t used_in_use_bytes = used_bytes_slow();
jmasa@4580 2734 assert(allocated_used_bytes() == used_in_use_bytes,
jmasa@4580 2735 err_msg("allocated_used_bytes() " SIZE_FORMAT
jmasa@4580 2736 " used_bytes_slow()()" SIZE_FORMAT,
jmasa@4580 2737 allocated_used_bytes(), used_in_use_bytes));
jmasa@4580 2738 #endif
jmasa@4580 2739 }
jmasa@4580 2740
jmasa@4580 2741 void MetaspaceAux::verify_metrics() {
jmasa@4580 2742 verify_capacity();
jmasa@4580 2743 verify_used();
jmasa@4580 2744 }
jmasa@4580 2745
jmasa@4580 2746
coleenp@3602 2747 // Metaspace methods
coleenp@3602 2748
coleenp@3602 2749 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2750 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2751
jmasa@3947 2752 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2753 initialize(lock, type);
coleenp@3602 2754 }
coleenp@3602 2755
coleenp@3602 2756 Metaspace::~Metaspace() {
coleenp@3602 2757 delete _vsm;
coleenp@3602 2758 delete _class_vsm;
coleenp@3602 2759 }
coleenp@3602 2760
coleenp@3602 2761 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2762 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2763
coleenp@3602 2764 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2765
coleenp@3602 2766 void Metaspace::global_initialize() {
coleenp@3602 2767 // Initialize the alignment for shared spaces.
coleenp@3602 2768 int max_alignment = os::vm_page_size();
coleenp@3602 2769 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2770
coleenp@3602 2771 if (DumpSharedSpaces) {
coleenp@3602 2772 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2773 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2774 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2775 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2776
coleenp@3602 2777 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2778 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2779 // remainder is the misc code and data chunks.
coleenp@3602 2780 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2781 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2782 os::vm_allocation_granularity());
coleenp@3602 2783 size_t word_size = total/wordSize;
coleenp@3602 2784 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2785 } else {
coleenp@3602 2786 // If using shared space, open the file that contains the shared space
coleenp@3602 2787 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2788 // the addresses don't conflict)
coleenp@3602 2789 if (UseSharedSpaces) {
coleenp@3602 2790 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2791 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2792
coleenp@3602 2793 // Open the shared archive file, read and validate the header. If
coleenp@3602 2794 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2795 // disabled and the file is closed.
coleenp@3602 2796 // Map in spaces now also
coleenp@3602 2797 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2798 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2799 } else {
coleenp@3602 2800 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2801 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2802 }
coleenp@3602 2803 }
coleenp@3602 2804
jmasa@3947 2805 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 2806 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 2807 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 2808 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 2809 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 2810 // from there. This size calculated by -version.
jmasa@3947 2811 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
jmasa@3947 2812 (ClassMetaspaceSize/BytesPerWord)*2);
jmasa@3947 2813 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 2814 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2815 // of the boot class loader size.
jmasa@3947 2816 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 2817 // Initialize the list of virtual spaces.
coleenp@3602 2818 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2819 }
coleenp@3602 2820 }
coleenp@3602 2821
coleenp@3602 2822 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2823 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2824 // argument passed in is at the top of the compressed space
coleenp@3602 2825 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2826 // The reserved space size may be bigger because of alignment, esp with UseLargePages
mikael@4113 2827 assert(rs.size() >= ClassMetaspaceSize,
mikael@4113 2828 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize));
coleenp@3602 2829 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2830 }
coleenp@3602 2831
jmasa@3947 2832 void Metaspace::initialize(Mutex* lock,
jmasa@3947 2833 MetaspaceType type) {
coleenp@3602 2834
coleenp@3602 2835 assert(space_list() != NULL,
coleenp@3602 2836 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2837
coleenp@3602 2838 _vsm = new SpaceManager(lock, space_list());
coleenp@3602 2839 if (_vsm == NULL) {
coleenp@3602 2840 return;
coleenp@3602 2841 }
jmasa@3947 2842 size_t word_size;
jmasa@3947 2843 size_t class_word_size;
jmasa@3947 2844 vsm()->get_initial_chunk_sizes(type,
jmasa@3947 2845 &word_size,
jmasa@3947 2846 &class_word_size);
coleenp@3602 2847
coleenp@3602 2848 assert(class_space_list() != NULL,
coleenp@3602 2849 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2850
coleenp@3602 2851 // Allocate SpaceManager for classes.
coleenp@3602 2852 _class_vsm = new SpaceManager(lock, class_space_list());
coleenp@3602 2853 if (_class_vsm == NULL) {
coleenp@3602 2854 return;
coleenp@3602 2855 }
coleenp@3602 2856
coleenp@3602 2857 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2858
coleenp@3602 2859 // Allocate chunk for metadata objects
coleenp@3602 2860 Metachunk* new_chunk =
jmasa@3947 2861 space_list()->get_initialization_chunk(word_size,
jmasa@3947 2862 vsm()->medium_chunk_bunch());
coleenp@3602 2863 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2864 if (new_chunk != NULL) {
coleenp@3602 2865 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2866 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2867 }
coleenp@3602 2868
coleenp@3602 2869 // Allocate chunk for class metadata objects
coleenp@3602 2870 Metachunk* class_chunk =
jmasa@3947 2871 class_space_list()->get_initialization_chunk(class_word_size,
jmasa@3947 2872 class_vsm()->medium_chunk_bunch());
coleenp@3602 2873 if (class_chunk != NULL) {
coleenp@3602 2874 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2875 }
coleenp@3602 2876 }
coleenp@3602 2877
jmasa@3947 2878 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 2879 size_t byte_size = word_size * wordSize;
jmasa@3947 2880 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@3947 2881 }
jmasa@3947 2882
coleenp@3602 2883 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2884 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2885 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2886 return class_vsm()->allocate(word_size);
coleenp@3602 2887 } else {
jmasa@3761 2888 return vsm()->allocate(word_size);
coleenp@3602 2889 }
coleenp@3602 2890 }
coleenp@3602 2891
jmasa@3629 2892 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2893 MetaWord* result;
jmasa@3629 2894 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2895 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@4580 2896 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size) * BytesPerWord;
jmasa@4580 2897 MetaspaceGC::inc_capacity_until_GC(delta_bytes);
jmasa@3629 2898 if (PrintGCDetails && Verbose) {
jmasa@3629 2899 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2900 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2901 }
jmasa@3761 2902
jmasa@3629 2903 result = allocate(word_size, mdtype);
jmasa@3629 2904
jmasa@3629 2905 return result;
jmasa@3629 2906 }
jmasa@3629 2907
coleenp@3602 2908 // Space allocated in the Metaspace. This may
coleenp@3602 2909 // be across several metadata virtual spaces.
coleenp@3602 2910 char* Metaspace::bottom() const {
coleenp@3602 2911 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2912 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2913 }
coleenp@3602 2914
jmasa@4580 2915 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
jmasa@4580 2916 // return vsm()->allocated_used_words();
coleenp@3602 2917 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2918 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2919 }
coleenp@3602 2920
coleenp@3602 2921 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2922 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2923 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2924 }
coleenp@3602 2925
coleenp@3602 2926 // Space capacity in the Metaspace. It includes
coleenp@3602 2927 // space in the list of chunks from which allocations
coleenp@3602 2928 // have been made. Don't include space in the global freelist and
coleenp@3602 2929 // in the space available in the dictionary which
coleenp@3602 2930 // is already counted in some chunk.
jmasa@4580 2931 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
coleenp@3602 2932 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2933 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2934 }
coleenp@3602 2935
jmasa@4580 2936 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
jmasa@4580 2937 return used_words_slow(mdtype) * BytesPerWord;
jmasa@4580 2938 }
jmasa@4580 2939
jmasa@4580 2940 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
jmasa@4580 2941 return capacity_words_slow(mdtype) * BytesPerWord;
jmasa@4580 2942 }
jmasa@4580 2943
coleenp@3602 2944 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2945 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2946 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2947 // Don't take Heap_lock
jmasa@3761 2948 MutexLocker ml(vsm()->lock());
jmasa@3761 2949 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2950 // Dark matter. Too small for dictionary.
jmasa@3761 2951 #ifdef ASSERT
jmasa@3761 2952 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2953 #endif
jmasa@3761 2954 return;
jmasa@3761 2955 }
coleenp@3602 2956 if (is_class) {
jmasa@3761 2957 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2958 } else {
jmasa@3761 2959 vsm()->deallocate(ptr, word_size);
coleenp@3602 2960 }
coleenp@3602 2961 } else {
coleenp@3602 2962 MutexLocker ml(vsm()->lock());
coleenp@3602 2963
jmasa@3761 2964 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2965 // Dark matter. Too small for dictionary.
jmasa@3761 2966 #ifdef ASSERT
jmasa@3761 2967 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2968 #endif
jmasa@3761 2969 return;
jmasa@3761 2970 }
coleenp@3602 2971 if (is_class) {
jmasa@3761 2972 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2973 } else {
jmasa@3761 2974 vsm()->deallocate(ptr, word_size);
coleenp@3602 2975 }
coleenp@3602 2976 }
coleenp@3602 2977 }
coleenp@3602 2978
jmasa@3761 2979 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 2980 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 2981 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 2982 assert(false, "Should not allocate with exception pending");
coleenp@3602 2983 return NULL; // caller does a CHECK_NULL too
coleenp@3602 2984 }
coleenp@3602 2985
coleenp@3602 2986 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 2987 MetaWord* result = NULL;
coleenp@3602 2988
coleenp@3602 2989 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 2990 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 2991 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 2992 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 2993 // to revisit this for application class data sharing.
coleenp@3602 2994 if (DumpSharedSpaces) {
coleenp@3602 2995 if (read_only) {
coleenp@3602 2996 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2997 } else {
coleenp@3602 2998 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2999 }
coleenp@3602 3000 if (result == NULL) {
coleenp@3602 3001 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 3002 }
jmasa@3761 3003 return Metablock::initialize(result, word_size);
coleenp@3602 3004 }
coleenp@3602 3005
coleenp@3602 3006 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 3007
coleenp@3602 3008 if (result == NULL) {
coleenp@3602 3009 // Try to clean out some memory and retry.
coleenp@3602 3010 result =
jmasa@3761 3011 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 3012 loader_data, word_size, mdtype);
coleenp@3602 3013
coleenp@3602 3014 // If result is still null, we are out of memory.
coleenp@3602 3015 if (result == NULL) {
jmasa@3947 3016 if (Verbose && TraceMetadataChunkAllocation) {
jmasa@3947 3017 gclog_or_tty->print_cr("Metaspace allocation failed for size "
jmasa@3947 3018 SIZE_FORMAT, word_size);
jmasa@3947 3019 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty);
jmasa@3947 3020 MetaspaceAux::dump(gclog_or_tty);
jmasa@3947 3021 }
coleenp@3602 3022 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 3023 report_java_out_of_memory("Metadata space");
coleenp@3602 3024
coleenp@3602 3025 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 3026 JvmtiExport::post_resource_exhausted(
coleenp@3602 3027 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 3028 "Metadata space");
coleenp@3602 3029 }
coleenp@3602 3030 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 3031 }
coleenp@3602 3032 }
jmasa@3761 3033 return Metablock::initialize(result, word_size);
coleenp@3602 3034 }
coleenp@3602 3035
jmasa@4572 3036 void Metaspace::purge() {
jmasa@4572 3037 MutexLockerEx cl(SpaceManager::expand_lock(),
jmasa@4572 3038 Mutex::_no_safepoint_check_flag);
jmasa@4572 3039 space_list()->purge();
jmasa@4572 3040 class_space_list()->purge();
jmasa@4572 3041 }
jmasa@4572 3042
coleenp@3602 3043 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 3044 // Print both class virtual space counts and metaspace.
coleenp@3602 3045 if (Verbose) {
coleenp@3602 3046 vsm()->print_on(out);
coleenp@3602 3047 class_vsm()->print_on(out);
coleenp@3602 3048 }
coleenp@3602 3049 }
coleenp@3602 3050
coleenp@3860 3051 bool Metaspace::contains(const void * ptr) {
coleenp@3602 3052 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 3053 return true;
coleenp@3602 3054 }
coleenp@3860 3055 // This is checked while unlocked. As long as the virtualspaces are added
coleenp@3860 3056 // at the end, the pointer will be in one of them. The virtual spaces
coleenp@3860 3057 // aren't deleted presently. When they are, some sort of locking might
coleenp@3860 3058 // be needed. Note, locking this can cause inversion problems with the
coleenp@3860 3059 // caller in MetaspaceObj::is_metadata() function.
jmasa@4572 3060 return space_list()->contains(ptr) ||
jmasa@4572 3061 class_space_list()->contains(ptr);
coleenp@3602 3062 }
coleenp@3602 3063
coleenp@3602 3064 void Metaspace::verify() {
coleenp@3602 3065 vsm()->verify();
coleenp@3602 3066 class_vsm()->verify();
coleenp@3602 3067 }
coleenp@3602 3068
coleenp@3602 3069 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 3070 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 3071 vsm()->dump(out);
coleenp@3602 3072 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 3073 class_vsm()->dump(out);
coleenp@3602 3074 }