annotate src/share/vm/memory/metaspace.cpp @ 5268:d6c266999345

8023476: Metaspace capacity > reserved Reviewed-by: stefank, hseigel, mgerdin
author ehelin
date Thu, 12 Sep 2013 10:15:30 +0200
parents 24e87613ee58
children c4c768305a8f
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"
hseigel@5093 38 #include "runtime/java.hpp"
coleenp@3602 39 #include "runtime/mutex.hpp"
coleenp@3860 40 #include "runtime/orderAccess.hpp"
coleenp@3602 41 #include "services/memTracker.hpp"
coleenp@3602 42 #include "utilities/copy.hpp"
coleenp@3602 43 #include "utilities/debug.hpp"
coleenp@3602 44
jmasa@3761 45 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
jmasa@3761 46 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
mgerdin@3829 47 // Define this macro to enable slow integrity checking of
mgerdin@3829 48 // the free chunk lists
mgerdin@3829 49 const bool metaspace_slow_verify = false;
mgerdin@3829 50
coleenp@3602 51 // Parameters for stress mode testing
coleenp@3602 52 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 53 const uint metadata_deallocate_a_lock_chunk = 3;
mgerdin@5264 54 size_t const allocation_from_dictionary_limit = 4 * K;
coleenp@3602 55
coleenp@3602 56 MetaWord* last_allocated = 0;
coleenp@3602 57
hseigel@5093 58 size_t Metaspace::_class_metaspace_size;
hseigel@5093 59
coleenp@3602 60 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 61 enum ChunkIndex {
jmasa@3947 62 ZeroIndex = 0,
jmasa@3947 63 SpecializedIndex = ZeroIndex,
jmasa@3947 64 SmallIndex = SpecializedIndex + 1,
jmasa@3947 65 MediumIndex = SmallIndex + 1,
jmasa@3947 66 HumongousIndex = MediumIndex + 1,
jmasa@3947 67 NumberOfFreeLists = 3,
jmasa@3947 68 NumberOfInUseLists = 4
jmasa@3947 69 };
jmasa@3947 70
jmasa@3947 71 enum ChunkSizes { // in words.
jmasa@3947 72 ClassSpecializedChunk = 128,
jmasa@3947 73 SpecializedChunk = 128,
jmasa@3947 74 ClassSmallChunk = 256,
jmasa@3947 75 SmallChunk = 512,
coleenp@4902 76 ClassMediumChunk = 4 * K,
jmasa@3947 77 MediumChunk = 8 * K,
jmasa@3947 78 HumongousChunkGranularity = 8
coleenp@3602 79 };
coleenp@3602 80
coleenp@3602 81 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 82 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 83 return (ChunkIndex) (i+1);
coleenp@3602 84 }
coleenp@3602 85
coleenp@3602 86 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 87 // the default MetaspaceSize before argument processing was being
coleenp@3602 88 // used which was not the desired value. See the code
coleenp@3602 89 // in should_expand() to see how the initialization is handled
coleenp@3602 90 // now.
coleenp@3602 91 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 92 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 93 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 94 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 95
coleenp@3602 96 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 97 //
coleenp@3602 98 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 99 // allocated there is no explicit link between a Metachunk and
coleenp@3602 100 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 101 //
coleenp@3602 102 // Each SpaceManager maintains a
coleenp@3602 103 // list of the chunks it is using and the current chunk. The current
coleenp@3602 104 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 105 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 106 // reused from there.
coleenp@3602 107
jmasa@4497 108 typedef class FreeList<Metachunk> ChunkList;
coleenp@3602 109
coleenp@3602 110 // Manages the global free lists of chunks.
coleenp@3602 111 // Has three lists of free chunks, and a total size and
coleenp@3602 112 // count that includes all three
coleenp@3602 113
coleenp@3602 114 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 115
coleenp@3602 116 // Free list of chunks of different sizes.
jmasa@4572 117 // SpecializedChunk
coleenp@3602 118 // SmallChunk
coleenp@3602 119 // MediumChunk
coleenp@3602 120 // HumongousChunk
jmasa@3761 121 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 122
jmasa@3947 123
jmasa@3761 124 // HumongousChunk
jmasa@3761 125 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 126
coleenp@3602 127 // ChunkManager in all lists of this type
coleenp@3602 128 size_t _free_chunks_total;
coleenp@3602 129 size_t _free_chunks_count;
coleenp@3602 130
coleenp@3602 131 void dec_free_chunks_total(size_t v) {
coleenp@3602 132 assert(_free_chunks_count > 0 &&
coleenp@3602 133 _free_chunks_total > 0,
coleenp@3602 134 "About to go negative");
coleenp@3602 135 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 136 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 137 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 138 }
coleenp@3602 139
coleenp@3602 140 // Debug support
coleenp@3602 141
coleenp@3602 142 size_t sum_free_chunks();
coleenp@3602 143 size_t sum_free_chunks_count();
coleenp@3602 144
coleenp@3602 145 void locked_verify_free_chunks_total();
mgerdin@3829 146 void slow_locked_verify_free_chunks_total() {
mgerdin@3829 147 if (metaspace_slow_verify) {
mgerdin@3829 148 locked_verify_free_chunks_total();
mgerdin@3829 149 }
mgerdin@3829 150 }
coleenp@3602 151 void locked_verify_free_chunks_count();
mgerdin@3829 152 void slow_locked_verify_free_chunks_count() {
mgerdin@3829 153 if (metaspace_slow_verify) {
mgerdin@3829 154 locked_verify_free_chunks_count();
mgerdin@3829 155 }
mgerdin@3829 156 }
coleenp@3602 157 void verify_free_chunks_count();
coleenp@3602 158
coleenp@3602 159 public:
coleenp@3602 160
coleenp@3602 161 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 162
coleenp@3602 163 // add or delete (return) a chunk to the global freelist.
coleenp@3602 164 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 165 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 166
jmasa@3947 167 // Map a size to a list index assuming that there are lists
jmasa@3947 168 // for special, small, medium, and humongous chunks.
jmasa@3947 169 static ChunkIndex list_index(size_t size);
jmasa@3947 170
jmasa@4572 171 // Remove the chunk from its freelist. It is
jmasa@4572 172 // expected to be on one of the _free_chunks[] lists.
jmasa@4572 173 void remove_chunk(Metachunk* chunk);
jmasa@4572 174
jmasa@4497 175 // Add the simple linked list of chunks to the freelist of chunks
jmasa@4497 176 // of type index.
jmasa@4497 177 void return_chunks(ChunkIndex index, Metachunk* chunks);
jmasa@4497 178
coleenp@3602 179 // Total of the space in the free chunks list
ehelin@5268 180 size_t free_chunks_total_words();
ehelin@5268 181 size_t free_chunks_total_bytes();
coleenp@3602 182
coleenp@3602 183 // Number of chunks in the free chunks list
coleenp@3602 184 size_t free_chunks_count();
coleenp@3602 185
coleenp@3602 186 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 187 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 188 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 189 }
jmasa@3761 190 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 191 return &_humongous_dictionary;
jmasa@3761 192 }
coleenp@3602 193
coleenp@3602 194 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 195
coleenp@3602 196 // Returns the list for the given chunk word size.
coleenp@3602 197 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 198
coleenp@3602 199 // Add and remove from a list by size. Selects
coleenp@3602 200 // list based on size of chunk.
coleenp@3602 201 void free_chunks_put(Metachunk* chuck);
coleenp@3602 202 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 203
coleenp@3602 204 // Debug support
coleenp@3602 205 void verify();
mgerdin@3829 206 void slow_verify() {
mgerdin@3829 207 if (metaspace_slow_verify) {
mgerdin@3829 208 verify();
mgerdin@3829 209 }
mgerdin@3829 210 }
coleenp@3602 211 void locked_verify();
mgerdin@3829 212 void slow_locked_verify() {
mgerdin@3829 213 if (metaspace_slow_verify) {
mgerdin@3829 214 locked_verify();
mgerdin@3829 215 }
mgerdin@3829 216 }
coleenp@3602 217 void verify_free_chunks_total();
coleenp@3602 218
coleenp@3602 219 void locked_print_free_chunks(outputStream* st);
coleenp@3602 220 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 221
jmasa@3761 222 void print_on(outputStream* st);
coleenp@3602 223 };
coleenp@3602 224
coleenp@3602 225 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 226 // to the allocation of a quantum of metadata).
coleenp@3602 227 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 228 BlockTreeDictionary* _dictionary;
jmasa@3761 229 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 230
mgerdin@5264 231 // Only allocate and split from freelist if the size of the allocation
mgerdin@5264 232 // is at least 1/4th the size of the available block.
mgerdin@5264 233 const static int WasteMultiplier = 4;
mgerdin@5264 234
coleenp@3602 235 // Accessors
jmasa@3761 236 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 237
coleenp@3602 238 public:
coleenp@3602 239 BlockFreelist();
coleenp@3602 240 ~BlockFreelist();
coleenp@3602 241
coleenp@3602 242 // Get and return a block to the free list
jmasa@3761 243 MetaWord* get_block(size_t word_size);
jmasa@3761 244 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 245
jmasa@3761 246 size_t total_size() {
jmasa@3761 247 if (dictionary() == NULL) {
coleenp@3602 248 return 0;
jmasa@3761 249 } else {
jmasa@3761 250 return dictionary()->total_size();
coleenp@3602 251 }
jmasa@3761 252 }
coleenp@3602 253
coleenp@3602 254 void print_on(outputStream* st) const;
coleenp@3602 255 };
coleenp@3602 256
coleenp@3602 257 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 258 friend class VirtualSpaceList;
coleenp@3602 259
coleenp@3602 260 // Link to next VirtualSpaceNode
coleenp@3602 261 VirtualSpaceNode* _next;
coleenp@3602 262
coleenp@3602 263 // total in the VirtualSpace
coleenp@3602 264 MemRegion _reserved;
coleenp@3602 265 ReservedSpace _rs;
coleenp@3602 266 VirtualSpace _virtual_space;
coleenp@3602 267 MetaWord* _top;
jmasa@4572 268 // count of chunks contained in this VirtualSpace
jmasa@4572 269 uintx _container_count;
coleenp@3602 270
coleenp@3602 271 // Convenience functions to access the _virtual_space
coleenp@3602 272 char* low() const { return virtual_space()->low(); }
coleenp@3602 273 char* high() const { return virtual_space()->high(); }
coleenp@3602 274
jmasa@4572 275 // The first Metachunk will be allocated at the bottom of the
jmasa@4572 276 // VirtualSpace
jmasa@4572 277 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
jmasa@4572 278
jmasa@4572 279 void inc_container_count();
jmasa@4572 280 #ifdef ASSERT
jmasa@4572 281 uint container_count_slow();
jmasa@4572 282 #endif
jmasa@4572 283
coleenp@3602 284 public:
coleenp@3602 285
coleenp@3602 286 VirtualSpaceNode(size_t byte_size);
jmasa@4572 287 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
coleenp@3602 288 ~VirtualSpaceNode();
coleenp@3602 289
hseigel@5093 290 // Convenience functions for logical bottom and end
hseigel@5093 291 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
hseigel@5093 292 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
hseigel@5093 293
coleenp@3602 294 // address of next available space in _virtual_space;
coleenp@3602 295 // Accessors
coleenp@3602 296 VirtualSpaceNode* next() { return _next; }
coleenp@3602 297 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 298
coleenp@3602 299 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 300 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 301
coleenp@3602 302 // Accessors
coleenp@3602 303 MemRegion* reserved() { return &_reserved; }
coleenp@3602 304 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 305
jmasa@4580 306 // Returns true if "word_size" is available in the VirtualSpace
coleenp@3602 307 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 308
coleenp@3602 309 MetaWord* top() const { return _top; }
coleenp@3602 310 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 311
jmasa@4572 312 uintx container_count() { return _container_count; }
jmasa@4572 313 void dec_container_count();
jmasa@4572 314 #ifdef ASSERT
jmasa@4572 315 void verify_container_count();
jmasa@4572 316 #endif
jmasa@4572 317
coleenp@3602 318 // used and capacity in this single entry in the list
coleenp@3602 319 size_t used_words_in_vs() const;
coleenp@3602 320 size_t capacity_words_in_vs() const;
jmasa@4580 321 size_t free_words_in_vs() const;
coleenp@3602 322
coleenp@3602 323 bool initialize();
coleenp@3602 324
coleenp@3602 325 // get space from the virtual space
coleenp@3602 326 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 327
coleenp@3602 328 // Allocate a chunk from the virtual space and return it.
coleenp@3602 329 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 330 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 331
coleenp@3602 332 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 333 // to Virtualspace
coleenp@3602 334 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 335 bool shrink_by(size_t words);
coleenp@3602 336
jmasa@4572 337 // In preparation for deleting this node, remove all the chunks
jmasa@4572 338 // in the node from any freelist.
jmasa@4572 339 void purge(ChunkManager* chunk_manager);
jmasa@4572 340
coleenp@3869 341 #ifdef ASSERT
coleenp@3602 342 // Debug support
coleenp@3602 343 static void verify_virtual_space_total();
coleenp@3602 344 static void verify_virtual_space_count();
coleenp@3602 345 void mangle();
coleenp@3869 346 #endif
coleenp@3602 347
coleenp@3602 348 void print_on(outputStream* st) const;
coleenp@3602 349 };
coleenp@3602 350
coleenp@3602 351 // byte_size is the size of the associated virtualspace.
stefank@5143 352 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
zgu@4317 353 // align up to vm allocation granularity
zgu@4317 354 byte_size = align_size_up(byte_size, os::vm_allocation_granularity());
zgu@4317 355
coleenp@4369 356 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
coleenp@4369 357 // configurable address, generally at the top of the Java heap so other
coleenp@4369 358 // memory addresses don't conflict.
coleenp@3602 359 if (DumpSharedSpaces) {
coleenp@4369 360 char* shared_base = (char*)SharedBaseAddress;
coleenp@3602 361 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 362 if (_rs.is_reserved()) {
coleenp@4369 363 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
coleenp@3602 364 } else {
coleenp@4369 365 // Get a mmap region anywhere if the SharedBaseAddress fails.
coleenp@3602 366 _rs = ReservedSpace(byte_size);
coleenp@3602 367 }
coleenp@3602 368 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 369 } else {
coleenp@3602 370 _rs = ReservedSpace(byte_size);
coleenp@3602 371 }
coleenp@3602 372
coleenp@3602 373 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 374 }
coleenp@3602 375
jmasa@4572 376 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
jmasa@4572 377 Metachunk* chunk = first_chunk();
jmasa@4572 378 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 379 while (chunk < invalid_chunk ) {
jmasa@4572 380 assert(chunk->is_free(), "Should be marked free");
jmasa@4572 381 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 382 chunk_manager->remove_chunk(chunk);
jmasa@4572 383 assert(chunk->next() == NULL &&
jmasa@4572 384 chunk->prev() == NULL,
jmasa@4572 385 "Was not removed from its list");
jmasa@4572 386 chunk = (Metachunk*) next;
jmasa@4572 387 }
jmasa@4572 388 }
jmasa@4572 389
jmasa@4572 390 #ifdef ASSERT
jmasa@4572 391 uint VirtualSpaceNode::container_count_slow() {
jmasa@4572 392 uint count = 0;
jmasa@4572 393 Metachunk* chunk = first_chunk();
jmasa@4572 394 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 395 while (chunk < invalid_chunk ) {
jmasa@4572 396 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 397 // Don't count the chunks on the free lists. Those are
jmasa@4572 398 // still part of the VirtualSpaceNode but not currently
jmasa@4572 399 // counted.
jmasa@4572 400 if (!chunk->is_free()) {
jmasa@4572 401 count++;
jmasa@4572 402 }
jmasa@4572 403 chunk = (Metachunk*) next;
jmasa@4572 404 }
jmasa@4572 405 return count;
jmasa@4572 406 }
jmasa@4572 407 #endif
jmasa@4572 408
coleenp@3602 409 // List of VirtualSpaces for metadata allocation.
coleenp@3602 410 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 411 // for total space in the VirtualSpace.
coleenp@3602 412 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 413 friend class VirtualSpaceNode;
coleenp@3602 414
coleenp@3602 415 enum VirtualSpaceSizes {
coleenp@3602 416 VirtualSpaceSize = 256 * K
coleenp@3602 417 };
coleenp@3602 418
coleenp@3602 419 // Global list of virtual spaces
coleenp@3602 420 // Head of the list
coleenp@3602 421 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 422 // virtual space currently being used for allocations
coleenp@3602 423 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 424 // Free chunk list for all other metadata
coleenp@3602 425 ChunkManager _chunk_manager;
coleenp@3602 426
coleenp@3602 427 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 428 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 429 bool _is_class;
ehelin@5259 430 bool can_grow() const { return !is_class() || !UseCompressedClassPointers; }
coleenp@3602 431
coleenp@3602 432 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 433 size_t _virtual_space_total;
coleenp@3602 434 size_t _virtual_space_count;
coleenp@3602 435
coleenp@3602 436 ~VirtualSpaceList();
coleenp@3602 437
coleenp@3602 438 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 439
coleenp@3602 440 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 441 _virtual_space_list = v;
coleenp@3602 442 }
coleenp@3602 443 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 444 _current_virtual_space = v;
coleenp@3602 445 }
coleenp@3602 446
coleenp@3602 447 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 448
coleenp@3602 449 // Get another virtual space and add it to the list. This
coleenp@3602 450 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 451 // and is typically followed by the allocation of a chunk.
coleenp@3602 452 bool grow_vs(size_t vs_word_size);
coleenp@3602 453
coleenp@3602 454 public:
coleenp@3602 455 VirtualSpaceList(size_t word_size);
coleenp@3602 456 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 457
jmasa@4580 458 size_t free_bytes();
jmasa@4580 459
jmasa@3947 460 Metachunk* get_new_chunk(size_t word_size,
jmasa@3947 461 size_t grow_chunks_by_words,
jmasa@3947 462 size_t medium_chunk_bunch);
jmasa@3947 463
jmasa@3947 464 // Get the first chunk for a Metaspace. Used for
jmasa@3947 465 // special cases such as the boot class loader, reflection
jmasa@3947 466 // class loader and anonymous class loader.
jmasa@3947 467 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch);
coleenp@3602 468
coleenp@3602 469 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 470 return _current_virtual_space;
coleenp@3602 471 }
coleenp@3602 472
coleenp@3602 473 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 474 bool is_class() const { return _is_class; }
coleenp@3602 475
coleenp@3602 476 // Allocate the first virtualspace.
coleenp@3602 477 void initialize(size_t word_size);
coleenp@3602 478
coleenp@3602 479 size_t virtual_space_total() { return _virtual_space_total; }
jmasa@4572 480
jmasa@4572 481 void inc_virtual_space_total(size_t v);
jmasa@4572 482 void dec_virtual_space_total(size_t v);
jmasa@4572 483 void inc_virtual_space_count();
jmasa@4572 484 void dec_virtual_space_count();
jmasa@4572 485
jmasa@4572 486 // Unlink empty VirtualSpaceNodes and free it.
jmasa@4572 487 void purge();
coleenp@3602 488
coleenp@3602 489 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 490 // These are global values shared by all Metaspaces
coleenp@3602 491 size_t capacity_words_sum();
coleenp@3602 492 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 493 size_t used_words_sum();
coleenp@3602 494 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 495
coleenp@3602 496 bool contains(const void *ptr);
coleenp@3602 497
coleenp@3602 498 void print_on(outputStream* st) const;
coleenp@3602 499
coleenp@3602 500 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 501 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 502 public:
coleenp@3602 503 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 504 _virtual_spaces(virtual_spaces) {}
coleenp@3602 505
coleenp@3602 506 bool repeat() {
coleenp@3602 507 return _virtual_spaces != NULL;
coleenp@3602 508 }
coleenp@3602 509
coleenp@3602 510 VirtualSpaceNode* get_next() {
coleenp@3602 511 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 512 if (_virtual_spaces != NULL) {
coleenp@3602 513 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 514 }
coleenp@3602 515 return result;
coleenp@3602 516 }
coleenp@3602 517 };
coleenp@3602 518 };
coleenp@3602 519
coleenp@3602 520 class Metadebug : AllStatic {
coleenp@3602 521 // Debugging support for Metaspaces
coleenp@3602 522 static int _deallocate_block_a_lot_count;
coleenp@3602 523 static int _deallocate_chunk_a_lot_count;
coleenp@3602 524 static int _allocation_fail_alot_count;
coleenp@3602 525
coleenp@3602 526 public:
coleenp@3602 527 static int deallocate_block_a_lot_count() {
coleenp@3602 528 return _deallocate_block_a_lot_count;
coleenp@3602 529 }
coleenp@3602 530 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 531 _deallocate_block_a_lot_count = v;
coleenp@3602 532 }
coleenp@3602 533 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 534 _deallocate_block_a_lot_count++;
coleenp@3602 535 }
coleenp@3602 536 static int deallocate_chunk_a_lot_count() {
coleenp@3602 537 return _deallocate_chunk_a_lot_count;
coleenp@3602 538 }
coleenp@3602 539 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 540 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 541 }
coleenp@3602 542 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 543 _deallocate_chunk_a_lot_count++;
coleenp@3602 544 }
coleenp@3602 545
coleenp@3602 546 static void init_allocation_fail_alot_count();
coleenp@3602 547 #ifdef ASSERT
coleenp@3602 548 static bool test_metadata_failure();
coleenp@3602 549 #endif
coleenp@3602 550
coleenp@3602 551 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 552 size_t chunk_word_size);
coleenp@3602 553 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 554 size_t chunk_word_size);
coleenp@3602 555
coleenp@3602 556 };
coleenp@3602 557
coleenp@3602 558 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 559 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 560 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 561
coleenp@3602 562 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 563 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 564 friend class Metaspace;
coleenp@3602 565 friend class Metadebug;
coleenp@3602 566
coleenp@3602 567 private:
jmasa@3947 568
coleenp@3602 569 // protects allocations and contains.
coleenp@3602 570 Mutex* const _lock;
coleenp@3602 571
jmasa@4727 572 // Type of metadata allocated.
jmasa@4727 573 Metaspace::MetadataType _mdtype;
jmasa@4727 574
jmasa@3947 575 // Chunk related size
jmasa@3947 576 size_t _medium_chunk_bunch;
jmasa@3947 577
coleenp@3602 578 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 579 // are done from the current chunk. The list is used for deallocating
coleenp@3602 580 // chunks when the SpaceManager is freed.
jmasa@3761 581 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 582 Metachunk* _current_chunk;
coleenp@3602 583
coleenp@3602 584 // Virtual space where allocation comes from.
coleenp@3602 585 VirtualSpaceList* _vs_list;
coleenp@3602 586
coleenp@3602 587 // Number of small chunks to allocate to a manager
coleenp@3602 588 // If class space manager, small chunks are unlimited
coleenp@3602 589 static uint const _small_chunk_limit;
coleenp@3602 590
coleenp@3602 591 // Sum of all space in allocated chunks
jmasa@4580 592 size_t _allocated_blocks_words;
jmasa@4580 593
jmasa@4580 594 // Sum of all allocated chunks
jmasa@4580 595 size_t _allocated_chunks_words;
jmasa@4580 596 size_t _allocated_chunks_count;
coleenp@3602 597
coleenp@3602 598 // Free lists of blocks are per SpaceManager since they
coleenp@3602 599 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 600 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 601 // the class loader using the SpaceManager is collected.
coleenp@3602 602 BlockFreelist _block_freelists;
coleenp@3602 603
coleenp@3602 604 // protects virtualspace and chunk expansions
coleenp@3602 605 static const char* _expand_lock_name;
coleenp@3602 606 static const int _expand_lock_rank;
coleenp@3602 607 static Mutex* const _expand_lock;
coleenp@3602 608
jmasa@3947 609 private:
coleenp@3602 610 // Accessors
coleenp@3602 611 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 612 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 613
coleenp@3602 614 BlockFreelist* block_freelists() const {
coleenp@3602 615 return (BlockFreelist*) &_block_freelists;
coleenp@3602 616 }
coleenp@3602 617
jmasa@4727 618 Metaspace::MetadataType mdtype() { return _mdtype; }
coleenp@3602 619 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 620
coleenp@3602 621 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 622 void set_current_chunk(Metachunk* v) {
coleenp@3602 623 _current_chunk = v;
coleenp@3602 624 }
coleenp@3602 625
coleenp@3602 626 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 627
coleenp@3602 628 // Add chunk to the list of chunks in use
coleenp@3602 629 void add_chunk(Metachunk* v, bool make_current);
mgerdin@5264 630 void retire_current_chunk();
coleenp@3602 631
coleenp@3602 632 Mutex* lock() const { return _lock; }
coleenp@3602 633
jmasa@3947 634 const char* chunk_size_name(ChunkIndex index) const;
jmasa@3947 635
jmasa@3947 636 protected:
jmasa@3947 637 void initialize();
jmasa@3947 638
coleenp@3602 639 public:
jmasa@4727 640 SpaceManager(Metaspace::MetadataType mdtype,
jmasa@4727 641 Mutex* lock,
jmasa@3947 642 VirtualSpaceList* vs_list);
coleenp@3602 643 ~SpaceManager();
coleenp@3602 644
jmasa@3947 645 enum ChunkMultiples {
jmasa@3947 646 MediumChunkMultiple = 4
coleenp@3602 647 };
coleenp@3602 648
coleenp@3602 649 // Accessors
jmasa@3947 650 size_t specialized_chunk_size() { return SpecializedChunk; }
jmasa@3947 651 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; }
jmasa@3947 652 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; }
jmasa@3947 653 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
jmasa@3947 654
jmasa@4580 655 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
jmasa@4580 656 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
jmasa@4580 657 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
jmasa@4580 658 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
jmasa@4580 659
jmasa@3947 660 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@3602 661
coleenp@3602 662 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 663
jmasa@4580 664 // Increment the per Metaspace and global running sums for Metachunks
jmasa@4580 665 // by the given size. This is used when a Metachunk to added to
jmasa@4580 666 // the in-use list.
jmasa@4580 667 void inc_size_metrics(size_t words);
jmasa@4580 668 // Increment the per Metaspace and global running sums Metablocks by the given
jmasa@4580 669 // size. This is used when a Metablock is allocated.
jmasa@4580 670 void inc_used_metrics(size_t words);
jmasa@4580 671 // Delete the portion of the running sums for this SpaceManager. That is,
jmasa@4580 672 // the globals running sums for the Metachunks and Metablocks are
jmasa@4580 673 // decremented for all the Metachunks in-use by this SpaceManager.
jmasa@4580 674 void dec_total_from_size_metrics();
jmasa@4580 675
jmasa@3947 676 // Set the sizes for the initial chunks.
jmasa@3947 677 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 678 size_t* chunk_word_size,
jmasa@3947 679 size_t* class_chunk_word_size);
jmasa@3947 680
coleenp@3602 681 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 682 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 683 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 684 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 685 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 686
coleenp@3602 687 size_t sum_count_in_chunks_in_use();
coleenp@3602 688 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 689
jmasa@3947 690 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@3947 691
coleenp@3602 692 // Block allocation and deallocation.
coleenp@3602 693 // Allocates a block from the current chunk
coleenp@3602 694 MetaWord* allocate(size_t word_size);
coleenp@3602 695
coleenp@3602 696 // Helper for allocations
jmasa@3761 697 MetaWord* allocate_work(size_t word_size);
coleenp@3602 698
coleenp@3602 699 // Returns a block to the per manager freelist
jmasa@3761 700 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 701
coleenp@3602 702 // Based on the allocation size and a minimum chunk size,
coleenp@3602 703 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 704 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 705
coleenp@3602 706 // Called when an allocation from the current chunk fails.
coleenp@3602 707 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 708 // and allocates from that chunk.
jmasa@3761 709 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 710
coleenp@3602 711 // debugging support.
coleenp@3602 712
coleenp@3602 713 void dump(outputStream* const out) const;
coleenp@3602 714 void print_on(outputStream* st) const;
coleenp@3602 715 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 716
coleenp@3602 717 void verify();
jmasa@3892 718 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 719 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 720 #ifdef ASSERT
jmasa@4580 721 void verify_allocated_blocks_words();
coleenp@3602 722 #endif
iklam@4773 723
iklam@4773 724 size_t get_raw_word_size(size_t word_size) {
iklam@4773 725 // If only the dictionary is going to be used (i.e., no
iklam@4773 726 // indexed free list), then there is a minimum size requirement.
iklam@4773 727 // MinChunkSize is a placeholder for the real minimum size JJJ
iklam@4773 728 size_t byte_size = word_size * BytesPerWord;
iklam@4773 729
iklam@4773 730 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
iklam@4773 731
iklam@4773 732 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
iklam@4773 733 Metablock::min_block_byte_size());
iklam@4773 734 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
iklam@4773 735 size_t raw_word_size = raw_bytes_size / BytesPerWord;
iklam@4773 736 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
iklam@4773 737
iklam@4773 738 return raw_word_size;
iklam@4773 739 }
coleenp@3602 740 };
coleenp@3602 741
coleenp@3602 742 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 743
coleenp@3602 744 const char* SpaceManager::_expand_lock_name =
coleenp@3602 745 "SpaceManager chunk allocation lock";
coleenp@3602 746 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 747 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 748 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 749 SpaceManager::_expand_lock_name,
coleenp@3602 750 Mutex::_allow_vm_block_flag);
coleenp@3602 751
jmasa@4572 752 void VirtualSpaceNode::inc_container_count() {
jmasa@4572 753 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 754 _container_count++;
jmasa@4572 755 assert(_container_count == container_count_slow(),
jmasa@4572 756 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 757 "container_count_slow() " SIZE_FORMAT,
jmasa@4572 758 _container_count, container_count_slow()));
jmasa@4572 759 }
jmasa@4572 760
jmasa@4572 761 void VirtualSpaceNode::dec_container_count() {
jmasa@4572 762 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 763 _container_count--;
jmasa@4572 764 }
jmasa@4572 765
jmasa@4572 766 #ifdef ASSERT
jmasa@4572 767 void VirtualSpaceNode::verify_container_count() {
jmasa@4572 768 assert(_container_count == container_count_slow(),
jmasa@4572 769 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 770 "container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
jmasa@4572 771 }
jmasa@4572 772 #endif
jmasa@4572 773
coleenp@3602 774 // BlockFreelist methods
coleenp@3602 775
coleenp@3602 776 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 777
coleenp@3602 778 BlockFreelist::~BlockFreelist() {
coleenp@3602 779 if (_dictionary != NULL) {
coleenp@3602 780 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 781 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 782 }
coleenp@3602 783 delete _dictionary;
coleenp@3602 784 }
coleenp@3602 785 }
coleenp@3602 786
jmasa@3761 787 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 788 Metablock* block = (Metablock*) p;
jmasa@3761 789 block->set_word_size(word_size);
jmasa@3761 790 block->set_prev(NULL);
jmasa@3761 791 block->set_next(NULL);
jmasa@3761 792
coleenp@3602 793 return block;
coleenp@3602 794 }
coleenp@3602 795
jmasa@3761 796 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 797 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 798 if (dictionary() == NULL) {
jmasa@3761 799 _dictionary = new BlockTreeDictionary();
coleenp@3602 800 }
jmasa@3761 801 dictionary()->return_chunk(free_chunk);
coleenp@3602 802 }
coleenp@3602 803
jmasa@3761 804 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 805 if (dictionary() == NULL) {
coleenp@3602 806 return NULL;
coleenp@3602 807 }
coleenp@3602 808
jmasa@3761 809 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 810 // Dark matter. Too small for dictionary.
coleenp@3602 811 return NULL;
coleenp@3602 812 }
jmasa@3761 813
jmasa@3761 814 Metablock* free_block =
mgerdin@5264 815 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast);
jmasa@3761 816 if (free_block == NULL) {
jmasa@3761 817 return NULL;
jmasa@3761 818 }
jmasa@3761 819
mgerdin@5264 820 const size_t block_size = free_block->size();
mgerdin@5264 821 if (block_size > WasteMultiplier * word_size) {
mgerdin@5264 822 return_block((MetaWord*)free_block, block_size);
mgerdin@5264 823 return NULL;
mgerdin@5264 824 }
mgerdin@5264 825
mgerdin@5264 826 MetaWord* new_block = (MetaWord*)free_block;
mgerdin@5264 827 assert(block_size >= word_size, "Incorrect size of block from freelist");
mgerdin@5264 828 const size_t unused = block_size - word_size;
mgerdin@5264 829 if (unused >= TreeChunk<Metablock, FreeList>::min_size()) {
mgerdin@5264 830 return_block(new_block + word_size, unused);
mgerdin@5264 831 }
mgerdin@5264 832
mgerdin@5264 833 return new_block;
coleenp@3602 834 }
coleenp@3602 835
coleenp@3602 836 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 837 if (dictionary() == NULL) {
coleenp@3602 838 return;
coleenp@3602 839 }
coleenp@3602 840 dictionary()->print_free_lists(st);
coleenp@3602 841 }
coleenp@3602 842
coleenp@3602 843 // VirtualSpaceNode methods
coleenp@3602 844
coleenp@3602 845 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 846 _rs.release();
jmasa@4572 847 #ifdef ASSERT
jmasa@4572 848 size_t word_size = sizeof(*this) / BytesPerWord;
jmasa@4572 849 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
jmasa@4572 850 #endif
coleenp@3602 851 }
coleenp@3602 852
coleenp@3602 853 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 854 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 855 }
coleenp@3602 856
coleenp@3602 857 // Space committed in the VirtualSpace
coleenp@3602 858 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 859 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 860 }
coleenp@3602 861
jmasa@4580 862 size_t VirtualSpaceNode::free_words_in_vs() const {
jmasa@4580 863 return pointer_delta(end(), top(), sizeof(MetaWord));
jmasa@4580 864 }
coleenp@3602 865
coleenp@3602 866 // Allocates the chunk from the virtual space only.
coleenp@3602 867 // This interface is also used internally for debugging. Not all
coleenp@3602 868 // chunks removed here are necessarily used for allocation.
coleenp@3602 869 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 870 // Bottom of the new chunk
coleenp@3602 871 MetaWord* chunk_limit = top();
coleenp@3602 872 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 873
coleenp@3602 874 if (!is_available(chunk_word_size)) {
coleenp@3602 875 if (TraceMetadataChunkAllocation) {
coleenp@3602 876 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 877 // Dump some information about the virtual space that is nearly full
coleenp@3602 878 print_on(tty);
coleenp@3602 879 }
coleenp@3602 880 return NULL;
coleenp@3602 881 }
coleenp@3602 882
coleenp@3602 883 // Take the space (bump top on the current virtual space).
coleenp@3602 884 inc_top(chunk_word_size);
coleenp@3602 885
jmasa@4572 886 // Initialize the chunk
jmasa@4572 887 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
coleenp@3602 888 return result;
coleenp@3602 889 }
coleenp@3602 890
coleenp@3602 891
coleenp@3602 892 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 893 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 894 size_t bytes = words * BytesPerWord;
coleenp@3602 895 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 896 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 897 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 898 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 899 virtual_space()->print();
coleenp@3602 900 }
coleenp@3602 901 return result;
coleenp@3602 902 }
coleenp@3602 903
coleenp@3602 904 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 905 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 906 size_t bytes = words * BytesPerWord;
coleenp@3602 907 virtual_space()->shrink_by(bytes);
coleenp@3602 908 return true;
coleenp@3602 909 }
coleenp@3602 910
coleenp@3602 911 // Add another chunk to the chunk list.
coleenp@3602 912
coleenp@3602 913 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 914 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 915 Metachunk* result = take_from_committed(chunk_word_size);
jmasa@4572 916 if (result != NULL) {
jmasa@4572 917 inc_container_count();
jmasa@4572 918 }
jmasa@4572 919 return result;
coleenp@3602 920 }
coleenp@3602 921
coleenp@3602 922 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 923 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 924
coleenp@3602 925 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 926
coleenp@3602 927 if (new_chunk == NULL) {
coleenp@3602 928 // Only a small part of the virtualspace is committed when first
coleenp@3602 929 // allocated so committing more here can be expected.
coleenp@3602 930 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 931 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 932 page_size_words);
coleenp@3602 933 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 934 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 935 }
coleenp@3602 936 return new_chunk;
coleenp@3602 937 }
coleenp@3602 938
coleenp@3602 939 bool VirtualSpaceNode::initialize() {
coleenp@3602 940
coleenp@3602 941 if (!_rs.is_reserved()) {
coleenp@3602 942 return false;
coleenp@3602 943 }
coleenp@3602 944
jmasa@3947 945 // An allocation out of this Virtualspace that is larger
jmasa@3947 946 // than an initial commit size can waste that initial committed
jmasa@3947 947 // space.
jmasa@3947 948 size_t committed_byte_size = 0;
coleenp@3602 949 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 950 if (result) {
coleenp@3602 951 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 952 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 953 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 954
coleenp@3603 955 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 956 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 957 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 958 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 959 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 960 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 961 _rs.size() / BytesPerWord));
coleenp@3602 962 }
coleenp@3602 963
coleenp@3602 964 return result;
coleenp@3602 965 }
coleenp@3602 966
coleenp@3602 967 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 968 size_t used = used_words_in_vs();
coleenp@3602 969 size_t capacity = capacity_words_in_vs();
coleenp@3602 970 VirtualSpace* vs = virtual_space();
coleenp@3602 971 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 972 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 973 PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@3947 974 vs, capacity / K,
jmasa@3947 975 capacity == 0 ? 0 : used * 100 / capacity,
coleenp@3602 976 bottom(), top(), end(),
coleenp@3602 977 vs->high_boundary());
coleenp@3602 978 }
coleenp@3602 979
coleenp@3869 980 #ifdef ASSERT
coleenp@3602 981 void VirtualSpaceNode::mangle() {
coleenp@3602 982 size_t word_size = capacity_words_in_vs();
coleenp@3602 983 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 984 }
coleenp@3869 985 #endif // ASSERT
coleenp@3602 986
coleenp@3602 987 // VirtualSpaceList methods
coleenp@3602 988 // Space allocated from the VirtualSpace
coleenp@3602 989
coleenp@3602 990 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 991 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 992 while (iter.repeat()) {
coleenp@3602 993 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 994 delete vsl;
coleenp@3602 995 }
coleenp@3602 996 }
coleenp@3602 997
jmasa@4572 998 void VirtualSpaceList::inc_virtual_space_total(size_t v) {
jmasa@4572 999 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 1000 _virtual_space_total = _virtual_space_total + v;
jmasa@4572 1001 }
jmasa@4572 1002 void VirtualSpaceList::dec_virtual_space_total(size_t v) {
jmasa@4572 1003 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 1004 _virtual_space_total = _virtual_space_total - v;
jmasa@4572 1005 }
jmasa@4572 1006
jmasa@4572 1007 void VirtualSpaceList::inc_virtual_space_count() {
jmasa@4572 1008 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 1009 _virtual_space_count++;
jmasa@4572 1010 }
jmasa@4572 1011 void VirtualSpaceList::dec_virtual_space_count() {
jmasa@4572 1012 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 1013 _virtual_space_count--;
jmasa@4572 1014 }
jmasa@4572 1015
jmasa@4572 1016 void ChunkManager::remove_chunk(Metachunk* chunk) {
jmasa@4572 1017 size_t word_size = chunk->word_size();
jmasa@4572 1018 ChunkIndex index = list_index(word_size);
jmasa@4572 1019 if (index != HumongousIndex) {
jmasa@4572 1020 free_chunks(index)->remove_chunk(chunk);
jmasa@4572 1021 } else {
jmasa@4572 1022 humongous_dictionary()->remove_chunk(chunk);
jmasa@4572 1023 }
jmasa@4572 1024
jmasa@4572 1025 // Chunk is being removed from the chunks free list.
jmasa@4572 1026 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@4572 1027 }
jmasa@4572 1028
jmasa@4572 1029 // Walk the list of VirtualSpaceNodes and delete
jmasa@4572 1030 // nodes with a 0 container_count. Remove Metachunks in
jmasa@4572 1031 // the node from their respective freelists.
jmasa@4572 1032 void VirtualSpaceList::purge() {
jmasa@4572 1033 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 1034 // Don't use a VirtualSpaceListIterator because this
jmasa@4572 1035 // list is being changed and a straightforward use of an iterator is not safe.
jmasa@4572 1036 VirtualSpaceNode* purged_vsl = NULL;
jmasa@4572 1037 VirtualSpaceNode* prev_vsl = virtual_space_list();
jmasa@4572 1038 VirtualSpaceNode* next_vsl = prev_vsl;
jmasa@4572 1039 while (next_vsl != NULL) {
jmasa@4572 1040 VirtualSpaceNode* vsl = next_vsl;
jmasa@4572 1041 next_vsl = vsl->next();
jmasa@4572 1042 // Don't free the current virtual space since it will likely
jmasa@4572 1043 // be needed soon.
jmasa@4572 1044 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
jmasa@4572 1045 // Unlink it from the list
jmasa@4572 1046 if (prev_vsl == vsl) {
jmasa@4572 1047 // This is the case of the current note being the first note.
jmasa@4572 1048 assert(vsl == virtual_space_list(), "Expected to be the first note");
jmasa@4572 1049 set_virtual_space_list(vsl->next());
jmasa@4572 1050 } else {
jmasa@4572 1051 prev_vsl->set_next(vsl->next());
jmasa@4572 1052 }
jmasa@4572 1053
jmasa@4572 1054 vsl->purge(chunk_manager());
jmasa@4572 1055 dec_virtual_space_total(vsl->reserved()->word_size());
jmasa@4572 1056 dec_virtual_space_count();
jmasa@4572 1057 purged_vsl = vsl;
jmasa@4572 1058 delete vsl;
jmasa@4572 1059 } else {
jmasa@4572 1060 prev_vsl = vsl;
jmasa@4572 1061 }
jmasa@4572 1062 }
jmasa@4572 1063 #ifdef ASSERT
jmasa@4572 1064 if (purged_vsl != NULL) {
jmasa@4572 1065 // List should be stable enough to use an iterator here.
jmasa@4572 1066 VirtualSpaceListIterator iter(virtual_space_list());
jmasa@4572 1067 while (iter.repeat()) {
jmasa@4572 1068 VirtualSpaceNode* vsl = iter.get_next();
jmasa@4572 1069 assert(vsl != purged_vsl, "Purge of vsl failed");
jmasa@4572 1070 }
jmasa@4572 1071 }
jmasa@4572 1072 #endif
jmasa@4572 1073 }
jmasa@4572 1074
coleenp@3602 1075 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 1076 size_t allocated_by_vs = 0;
coleenp@3602 1077 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1078 while (iter.repeat()) {
coleenp@3602 1079 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1080 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 1081 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 1082 }
ehelin@5268 1083 assert(allocated_by_vs >= chunk_manager()->free_chunks_total_words(),
coleenp@3602 1084 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 1085 " greater than total from virtual_spaces " SIZE_FORMAT,
ehelin@5268 1086 allocated_by_vs, chunk_manager()->free_chunks_total_words()));
coleenp@3602 1087 size_t used =
ehelin@5268 1088 allocated_by_vs - chunk_manager()->free_chunks_total_words();
coleenp@3602 1089 return used;
coleenp@3602 1090 }
coleenp@3602 1091
coleenp@3602 1092 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 1093 // for metadata. This is the upper limit on the capacity
coleenp@3602 1094 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 1095 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 1096 size_t capacity = 0;
coleenp@3602 1097 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1098 while (iter.repeat()) {
coleenp@3602 1099 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1100 capacity += vsl->capacity_words_in_vs();
coleenp@3602 1101 }
coleenp@3602 1102 return capacity;
coleenp@3602 1103 }
coleenp@3602 1104
coleenp@3602 1105 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 1106 _is_class(false),
coleenp@3602 1107 _virtual_space_list(NULL),
coleenp@3602 1108 _current_virtual_space(NULL),
coleenp@3602 1109 _virtual_space_total(0),
coleenp@3602 1110 _virtual_space_count(0) {
coleenp@3602 1111 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1112 Mutex::_no_safepoint_check_flag);
coleenp@3602 1113 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 1114
jmasa@4497 1115 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1116 _chunk_manager.free_chunks(SmallIndex)->set_size(SmallChunk);
jmasa@4497 1117 _chunk_manager.free_chunks(MediumIndex)->set_size(MediumChunk);
coleenp@3602 1118 assert(initialization_succeeded,
coleenp@3602 1119 " VirtualSpaceList initialization should not fail");
coleenp@3602 1120 }
coleenp@3602 1121
coleenp@3602 1122 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 1123 _is_class(true),
coleenp@3602 1124 _virtual_space_list(NULL),
coleenp@3602 1125 _current_virtual_space(NULL),
coleenp@3602 1126 _virtual_space_total(0),
coleenp@3602 1127 _virtual_space_count(0) {
coleenp@3602 1128 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1129 Mutex::_no_safepoint_check_flag);
coleenp@3602 1130 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 1131 bool succeeded = class_entry->initialize();
jmasa@4497 1132 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1133 _chunk_manager.free_chunks(SmallIndex)->set_size(ClassSmallChunk);
jmasa@4497 1134 _chunk_manager.free_chunks(MediumIndex)->set_size(ClassMediumChunk);
coleenp@3602 1135 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 1136 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 1137 }
coleenp@3602 1138
jmasa@4580 1139 size_t VirtualSpaceList::free_bytes() {
jmasa@4580 1140 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
jmasa@4580 1141 }
jmasa@4580 1142
coleenp@3602 1143 // Allocate another meta virtual space and add it to the list.
coleenp@3602 1144 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 1145 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1146 if (vs_word_size == 0) {
coleenp@3602 1147 return false;
coleenp@3602 1148 }
coleenp@3602 1149 // Reserve the space
coleenp@3602 1150 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 1151 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 1152
coleenp@3602 1153 // Allocate the meta virtual space and initialize it.
coleenp@3602 1154 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 1155 if (!new_entry->initialize()) {
coleenp@3602 1156 delete new_entry;
coleenp@3602 1157 return false;
coleenp@3602 1158 } else {
coleenp@3860 1159 // ensure lock-free iteration sees fully initialized node
coleenp@3860 1160 OrderAccess::storestore();
coleenp@3602 1161 link_vs(new_entry, vs_word_size);
coleenp@3602 1162 return true;
coleenp@3602 1163 }
coleenp@3602 1164 }
coleenp@3602 1165
coleenp@3602 1166 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 1167 if (virtual_space_list() == NULL) {
coleenp@3602 1168 set_virtual_space_list(new_entry);
coleenp@3602 1169 } else {
coleenp@3602 1170 current_virtual_space()->set_next(new_entry);
coleenp@3602 1171 }
coleenp@3602 1172 set_current_virtual_space(new_entry);
coleenp@3602 1173 inc_virtual_space_total(vs_word_size);
coleenp@3602 1174 inc_virtual_space_count();
coleenp@3602 1175 #ifdef ASSERT
coleenp@3602 1176 new_entry->mangle();
coleenp@3602 1177 #endif
coleenp@3602 1178 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 1179 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 1180 vsl->print_on(tty);
coleenp@3602 1181 }
coleenp@3602 1182 }
coleenp@3602 1183
coleenp@3602 1184 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@3947 1185 size_t grow_chunks_by_words,
jmasa@3947 1186 size_t medium_chunk_bunch) {
coleenp@3602 1187
coleenp@3602 1188 // Get a chunk from the chunk freelist
coleenp@3602 1189 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 1190
jmasa@4572 1191 if (next != NULL) {
jmasa@4572 1192 next->container()->inc_container_count();
jmasa@4572 1193 } else {
jmasa@4572 1194 // Allocate a chunk out of the current virtual space.
coleenp@3602 1195 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1196 }
coleenp@3602 1197
coleenp@3602 1198 if (next == NULL) {
coleenp@3602 1199 // Not enough room in current virtual space. Try to commit
coleenp@3602 1200 // more space.
jmasa@3947 1201 size_t expand_vs_by_words = MAX2(medium_chunk_bunch,
jmasa@3947 1202 grow_chunks_by_words);
coleenp@3602 1203 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1204 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 1205 page_size_words);
coleenp@3602 1206 bool vs_expanded =
coleenp@3602 1207 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 1208 if (!vs_expanded) {
coleenp@3602 1209 // Should the capacity of the metaspaces be expanded for
coleenp@3602 1210 // this allocation? If it's the virtual space for classes and is
coleenp@3602 1211 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 1212 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 1213 // Get another virtual space.
coleenp@3602 1214 size_t grow_vs_words =
coleenp@3602 1215 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 1216 if (grow_vs(grow_vs_words)) {
coleenp@3602 1217 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 1218 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 1219 }
coleenp@3602 1220 } else {
coleenp@3602 1221 // Allocation will fail and induce a GC
coleenp@3602 1222 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1223 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 1224 " Fail instead of expand the metaspace");
coleenp@3602 1225 }
coleenp@3602 1226 }
coleenp@3602 1227 } else {
coleenp@3602 1228 // The virtual space expanded, get a new chunk
coleenp@3602 1229 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1230 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 1231 }
coleenp@3602 1232 }
coleenp@3602 1233
jmasa@3947 1234 assert(next == NULL || (next->next() == NULL && next->prev() == NULL),
jmasa@3947 1235 "New chunk is still on some list");
coleenp@3602 1236 return next;
coleenp@3602 1237 }
coleenp@3602 1238
jmasa@3947 1239 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size,
jmasa@3947 1240 size_t chunk_bunch) {
jmasa@3947 1241 // Get a chunk from the chunk freelist
jmasa@3947 1242 Metachunk* new_chunk = get_new_chunk(chunk_word_size,
jmasa@3947 1243 chunk_word_size,
jmasa@3947 1244 chunk_bunch);
jmasa@3947 1245 return new_chunk;
jmasa@3947 1246 }
jmasa@3947 1247
coleenp@3602 1248 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1249 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1250 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1251 while (iter.repeat()) {
coleenp@3602 1252 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1253 node->print_on(st);
coleenp@3602 1254 }
coleenp@3602 1255 }
coleenp@3602 1256 }
coleenp@3602 1257
coleenp@3602 1258 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1259 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1260 VirtualSpaceListIterator iter(list);
coleenp@3602 1261 while (iter.repeat()) {
coleenp@3602 1262 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1263 if (node->reserved()->contains(ptr)) {
coleenp@3602 1264 return true;
coleenp@3602 1265 }
coleenp@3602 1266 }
coleenp@3602 1267 return false;
coleenp@3602 1268 }
coleenp@3602 1269
coleenp@3602 1270
coleenp@3602 1271 // MetaspaceGC methods
coleenp@3602 1272
coleenp@3602 1273 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1274 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1275 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1276 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1277 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1278 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1279 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1280 //
coleenp@3602 1281 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1282 // resize the capacity of the metaspaces. The current implementation
jmasa@4580 1283 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
coleenp@3602 1284 // to resize the Java heap by some GC's. New flags can be implemented
jmasa@4580 1285 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
coleenp@3602 1286 // free space is desirable in the metaspace capacity to decide how much
jmasa@4146 1287 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
coleenp@3602 1288 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1289 // the HWM.
coleenp@3602 1290
coleenp@3602 1291 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1292 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1293 // another expansion is not requested too soon. If that is not
coleenp@3602 1294 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1295 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1296 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1297 // some.
coleenp@3602 1298 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1299 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1300 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1301 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1302 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1303 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1304 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1305 if (delta_words > min_delta_words) {
coleenp@3602 1306 // Don't want to hit the high water mark on the next
coleenp@3602 1307 // allocation so make the delta greater than just enough
coleenp@3602 1308 // for this allocation.
coleenp@3602 1309 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1310 if (delta_words > max_delta_words) {
coleenp@3602 1311 // This allocation is large but the next ones are probably not
coleenp@3602 1312 // so increase by the minimum.
coleenp@3602 1313 delta_words = delta_words + min_delta_words;
coleenp@3602 1314 }
coleenp@3602 1315 }
coleenp@3602 1316 return delta_words;
coleenp@3602 1317 }
coleenp@3602 1318
coleenp@3602 1319 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
jmasa@4580 1320
mgerdin@4355 1321 // If the user wants a limit, impose one.
coleenp@4902 1322 // The reason for someone using this flag is to limit reserved space. So
coleenp@4902 1323 // for non-class virtual space, compare against virtual spaces that are reserved.
coleenp@4902 1324 // For class virtual space, we only compare against the committed space, not
coleenp@4902 1325 // reserved space, because this is a larger space prereserved for compressed
coleenp@4902 1326 // class pointers.
coleenp@4902 1327 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize)) {
coleenp@4902 1328 size_t real_allocated = Metaspace::space_list()->virtual_space_total() +
coleenp@4902 1329 MetaspaceAux::allocated_capacity_bytes(Metaspace::ClassType);
coleenp@4902 1330 if (real_allocated >= MaxMetaspaceSize) {
coleenp@4902 1331 return false;
coleenp@4902 1332 }
mgerdin@4355 1333 }
coleenp@3602 1334
coleenp@3602 1335 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1336 // metadata virtual space.
hseigel@5093 1337 if (Metaspace::using_class_space() &&
hseigel@5093 1338 (vsl == Metaspace::class_space_list())) return true;
coleenp@3602 1339
coleenp@3602 1340 // If this is part of an allocation after a GC, expand
coleenp@3602 1341 // unconditionally.
jmasa@4580 1342 if (MetaspaceGC::expand_after_GC()) {
coleenp@3602 1343 return true;
coleenp@3602 1344 }
coleenp@3602 1345
jmasa@4580 1346
coleenp@3602 1347 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1348 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1349 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1350 // until that minimum capacity is exceeded.
coleenp@4902 1351 size_t committed_capacity_bytes = MetaspaceAux::allocated_capacity_bytes();
coleenp@4902 1352 size_t metaspace_size_bytes = MetaspaceSize;
jmasa@4580 1353 if (committed_capacity_bytes < metaspace_size_bytes ||
coleenp@3602 1354 capacity_until_GC() == 0) {
jmasa@4580 1355 set_capacity_until_GC(metaspace_size_bytes);
coleenp@3602 1356 return true;
coleenp@3602 1357 } else {
jmasa@4580 1358 if (committed_capacity_bytes < capacity_until_GC()) {
coleenp@3602 1359 return true;
coleenp@3602 1360 } else {
coleenp@3602 1361 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1362 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1363 " capacity_until_GC " SIZE_FORMAT
jmasa@4580 1364 " allocated_capacity_bytes " SIZE_FORMAT,
coleenp@3602 1365 word_size,
coleenp@3602 1366 capacity_until_GC(),
jmasa@4580 1367 MetaspaceAux::allocated_capacity_bytes());
coleenp@3602 1368 }
coleenp@3602 1369 return false;
coleenp@3602 1370 }
coleenp@3602 1371 }
coleenp@3602 1372 }
coleenp@3602 1373
jmasa@4580 1374
coleenp@3602 1375
coleenp@3602 1376 void MetaspaceGC::compute_new_size() {
coleenp@3602 1377 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1378 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1379 _shrink_factor = 0;
coleenp@3602 1380
jmasa@4580 1381 // Until a faster way of calculating the "used" quantity is implemented,
jmasa@4580 1382 // use "capacity".
jmasa@4580 1383 const size_t used_after_gc = MetaspaceAux::allocated_capacity_bytes();
jmasa@4580 1384 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
coleenp@3602 1385
jmasa@4146 1386 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1387 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1388
coleenp@3602 1389 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1390 size_t minimum_desired_capacity =
coleenp@3602 1391 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1392 // Don't shrink less than the initial generation size
coleenp@3602 1393 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1394 MetaspaceSize);
coleenp@3602 1395
coleenp@3602 1396 if (PrintGCDetails && Verbose) {
coleenp@3602 1397 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1398 gclog_or_tty->print_cr(" "
coleenp@3602 1399 " minimum_free_percentage: %6.2f"
coleenp@3602 1400 " maximum_used_percentage: %6.2f",
coleenp@3602 1401 minimum_free_percentage,
coleenp@3602 1402 maximum_used_percentage);
coleenp@3602 1403 gclog_or_tty->print_cr(" "
jmasa@4580 1404 " used_after_gc : %6.1fKB",
jmasa@4580 1405 used_after_gc / (double) K);
coleenp@3602 1406 }
coleenp@3602 1407
coleenp@3602 1408
jmasa@4580 1409 size_t shrink_bytes = 0;
coleenp@3602 1410 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1411 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1412 // increment the HWM.
coleenp@3602 1413 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1414 // Don't expand unless it's significant
coleenp@3602 1415 if (expand_bytes >= MinMetaspaceExpansion) {
jmasa@4580 1416 MetaspaceGC::set_capacity_until_GC(capacity_until_GC + expand_bytes);
coleenp@3602 1417 }
coleenp@3602 1418 if (PrintGCDetails && Verbose) {
jmasa@4580 1419 size_t new_capacity_until_GC = capacity_until_GC;
coleenp@3602 1420 gclog_or_tty->print_cr(" expanding:"
jmasa@4580 1421 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1422 " expand_bytes: %6.1fKB"
jmasa@4580 1423 " MinMetaspaceExpansion: %6.1fKB"
jmasa@4580 1424 " new metaspace HWM: %6.1fKB",
coleenp@3602 1425 minimum_desired_capacity / (double) K,
coleenp@3602 1426 expand_bytes / (double) K,
coleenp@3602 1427 MinMetaspaceExpansion / (double) K,
coleenp@3602 1428 new_capacity_until_GC / (double) K);
coleenp@3602 1429 }
coleenp@3602 1430 return;
coleenp@3602 1431 }
coleenp@3602 1432
coleenp@3602 1433 // No expansion, now see if we want to shrink
coleenp@3602 1434 // We would never want to shrink more than this
jmasa@4580 1435 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
jmasa@4580 1436 assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
jmasa@4580 1437 max_shrink_bytes));
coleenp@3602 1438
coleenp@3602 1439 // Should shrinking be considered?
jmasa@4146 1440 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1441 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1442 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1443 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1444 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1445 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1446 MetaspaceSize);
jmasa@4580 1447 if (PrintGCDetails && Verbose) {
coleenp@3602 1448 gclog_or_tty->print_cr(" "
coleenp@3602 1449 " maximum_free_percentage: %6.2f"
coleenp@3602 1450 " minimum_used_percentage: %6.2f",
coleenp@3602 1451 maximum_free_percentage,
coleenp@3602 1452 minimum_used_percentage);
coleenp@3602 1453 gclog_or_tty->print_cr(" "
jmasa@4580 1454 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1455 " maximum_desired_capacity: %6.1fKB",
coleenp@3602 1456 minimum_desired_capacity / (double) K,
coleenp@3602 1457 maximum_desired_capacity / (double) K);
coleenp@3602 1458 }
coleenp@3602 1459
coleenp@3602 1460 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1461 "sanity check");
coleenp@3602 1462
coleenp@3602 1463 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1464 // Capacity too large, compute shrinking size
jmasa@4580 1465 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1466 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1467 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1468 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1469 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1470 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1471 // size without shrinking, it goes back to 0%.
jmasa@4580 1472 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
jmasa@4580 1473 assert(shrink_bytes <= max_shrink_bytes,
coleenp@3602 1474 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
jmasa@4580 1475 shrink_bytes, max_shrink_bytes));
coleenp@3602 1476 if (current_shrink_factor == 0) {
coleenp@3602 1477 _shrink_factor = 10;
coleenp@3602 1478 } else {
coleenp@3602 1479 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1480 }
coleenp@3602 1481 if (PrintGCDetails && Verbose) {
coleenp@3602 1482 gclog_or_tty->print_cr(" "
coleenp@3602 1483 " shrinking:"
coleenp@3602 1484 " initSize: %.1fK"
coleenp@3602 1485 " maximum_desired_capacity: %.1fK",
coleenp@3602 1486 MetaspaceSize / (double) K,
coleenp@3602 1487 maximum_desired_capacity / (double) K);
coleenp@3602 1488 gclog_or_tty->print_cr(" "
jmasa@4580 1489 " shrink_bytes: %.1fK"
coleenp@3602 1490 " current_shrink_factor: %d"
coleenp@3602 1491 " new shrink factor: %d"
coleenp@3602 1492 " MinMetaspaceExpansion: %.1fK",
jmasa@4580 1493 shrink_bytes / (double) K,
coleenp@3602 1494 current_shrink_factor,
coleenp@3602 1495 _shrink_factor,
coleenp@3602 1496 MinMetaspaceExpansion / (double) K);
coleenp@3602 1497 }
coleenp@3602 1498 }
coleenp@3602 1499 }
coleenp@3602 1500
coleenp@3602 1501 // Don't shrink unless it's significant
jmasa@4580 1502 if (shrink_bytes >= MinMetaspaceExpansion &&
jmasa@4580 1503 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
jmasa@4580 1504 MetaspaceGC::set_capacity_until_GC(capacity_until_GC - shrink_bytes);
coleenp@3602 1505 }
coleenp@3602 1506 }
coleenp@3602 1507
coleenp@3602 1508 // Metadebug methods
coleenp@3602 1509
coleenp@3602 1510 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1511 size_t chunk_word_size){
coleenp@3602 1512 #ifdef ASSERT
coleenp@3602 1513 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1514 if (MetaDataDeallocateALot &&
coleenp@3602 1515 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1516 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1517 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1518 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1519 if (dummy_chunk == NULL) {
coleenp@3602 1520 break;
coleenp@3602 1521 }
coleenp@3602 1522 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1523
coleenp@3602 1524 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1525 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1526 sm->sum_count_in_chunks_in_use());
coleenp@3602 1527 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1528 gclog_or_tty->print_cr(" Free chunks total %d count %d",
ehelin@5268 1529 vsl->chunk_manager()->free_chunks_total_words(),
coleenp@3602 1530 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1531 }
coleenp@3602 1532 }
coleenp@3602 1533 } else {
coleenp@3602 1534 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1535 }
coleenp@3602 1536 #endif
coleenp@3602 1537 }
coleenp@3602 1538
coleenp@3602 1539 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1540 size_t raw_word_size){
coleenp@3602 1541 #ifdef ASSERT
coleenp@3602 1542 if (MetaDataDeallocateALot &&
coleenp@3602 1543 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1544 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1545 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1546 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1547 if (dummy_block == 0) {
coleenp@3602 1548 break;
coleenp@3602 1549 }
jmasa@3761 1550 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1551 }
coleenp@3602 1552 } else {
coleenp@3602 1553 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1554 }
coleenp@3602 1555 #endif
coleenp@3602 1556 }
coleenp@3602 1557
coleenp@3602 1558 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1559 if (MetadataAllocationFailALot) {
coleenp@3602 1560 _allocation_fail_alot_count =
coleenp@3602 1561 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1562 }
coleenp@3602 1563 }
coleenp@3602 1564
coleenp@3602 1565 #ifdef ASSERT
coleenp@3602 1566 bool Metadebug::test_metadata_failure() {
coleenp@3602 1567 if (MetadataAllocationFailALot &&
coleenp@3602 1568 Threads::is_vm_complete()) {
coleenp@3602 1569 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1570 _allocation_fail_alot_count--;
coleenp@3602 1571 } else {
coleenp@3602 1572 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1573 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1574 "MetadataAllocationFailALot");
coleenp@3602 1575 }
coleenp@3602 1576 init_allocation_fail_alot_count();
coleenp@3602 1577 return true;
coleenp@3602 1578 }
coleenp@3602 1579 }
coleenp@3602 1580 return false;
coleenp@3602 1581 }
coleenp@3602 1582 #endif
coleenp@3602 1583
coleenp@3602 1584 // ChunkManager methods
coleenp@3602 1585
ehelin@5268 1586 size_t ChunkManager::free_chunks_total_words() {
coleenp@3602 1587 return _free_chunks_total;
coleenp@3602 1588 }
coleenp@3602 1589
ehelin@5268 1590 size_t ChunkManager::free_chunks_total_bytes() {
ehelin@5268 1591 return free_chunks_total_words() * BytesPerWord;
coleenp@3602 1592 }
coleenp@3602 1593
coleenp@3602 1594 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1595 #ifdef ASSERT
coleenp@3602 1596 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1597 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1598 Mutex::_no_safepoint_check_flag);
coleenp@3602 1599 // This lock is only needed in debug because the verification
coleenp@3602 1600 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1601 slow_locked_verify_free_chunks_count();
coleenp@3602 1602 }
coleenp@3602 1603 #endif
mgerdin@3829 1604 return _free_chunks_count;
coleenp@3602 1605 }
coleenp@3602 1606
coleenp@3602 1607 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1608 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1609 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1610 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1611 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1612 sum_free_chunks()));
coleenp@3602 1613 }
coleenp@3602 1614
coleenp@3602 1615 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1616 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1617 Mutex::_no_safepoint_check_flag);
coleenp@3602 1618 locked_verify_free_chunks_total();
coleenp@3602 1619 }
coleenp@3602 1620
coleenp@3602 1621 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1622 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1623 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1624 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1625 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1626 sum_free_chunks_count()));
coleenp@3602 1627 }
coleenp@3602 1628
coleenp@3602 1629 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1630 #ifdef ASSERT
coleenp@3602 1631 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1632 Mutex::_no_safepoint_check_flag);
coleenp@3602 1633 locked_verify_free_chunks_count();
coleenp@3602 1634 #endif
coleenp@3602 1635 }
coleenp@3602 1636
coleenp@3602 1637 void ChunkManager::verify() {
mgerdin@3829 1638 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1639 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1640 locked_verify();
coleenp@3602 1641 }
coleenp@3602 1642
coleenp@3602 1643 void ChunkManager::locked_verify() {
jmasa@3761 1644 locked_verify_free_chunks_count();
coleenp@3602 1645 locked_verify_free_chunks_total();
coleenp@3602 1646 }
coleenp@3602 1647
coleenp@3602 1648 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1649 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1650 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1651 _free_chunks_total, _free_chunks_count);
coleenp@3602 1652 }
coleenp@3602 1653
coleenp@3602 1654 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1655 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1656 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1657 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1658 }
coleenp@3602 1659 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1660 return &_free_chunks[index];
coleenp@3602 1661 }
coleenp@3602 1662
coleenp@3602 1663 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1664 // methods that are used in product builds.
coleenp@3602 1665 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1666 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1667 size_t result = 0;
jmasa@3947 1668 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1669 ChunkList* list = free_chunks(i);
coleenp@3602 1670
coleenp@3602 1671 if (list == NULL) {
coleenp@3602 1672 continue;
coleenp@3602 1673 }
coleenp@3602 1674
jmasa@4497 1675 result = result + list->count() * list->size();
coleenp@3602 1676 }
jmasa@3761 1677 result = result + humongous_dictionary()->total_size();
coleenp@3602 1678 return result;
coleenp@3602 1679 }
coleenp@3602 1680
coleenp@3602 1681 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1682 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1683 size_t count = 0;
jmasa@3947 1684 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1685 ChunkList* list = free_chunks(i);
coleenp@3602 1686 if (list == NULL) {
coleenp@3602 1687 continue;
coleenp@3602 1688 }
jmasa@4497 1689 count = count + list->count();
coleenp@3602 1690 }
jmasa@3761 1691 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1692 return count;
coleenp@3602 1693 }
coleenp@3602 1694
coleenp@3602 1695 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1696 ChunkIndex index = list_index(word_size);
jmasa@3947 1697 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1698 return free_chunks(index);
coleenp@3602 1699 }
coleenp@3602 1700
coleenp@3602 1701 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1702 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1703 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1704 chunk->set_next(free_list->head());
coleenp@3602 1705 free_list->set_head(chunk);
coleenp@3602 1706 // chunk is being returned to the chunk free list
coleenp@3602 1707 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1708 slow_locked_verify();
coleenp@3602 1709 }
coleenp@3602 1710
coleenp@3602 1711 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1712 // The deallocation of a chunk originates in the freelist
coleenp@3602 1713 // manangement code for a Metaspace and does not hold the
coleenp@3602 1714 // lock.
coleenp@3602 1715 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1716 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1717 slow_locked_verify();
coleenp@3602 1718 if (TraceMetadataChunkAllocation) {
coleenp@3602 1719 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1720 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1721 chunk, chunk->word_size());
coleenp@3602 1722 }
coleenp@3602 1723 free_chunks_put(chunk);
coleenp@3602 1724 }
coleenp@3602 1725
coleenp@3602 1726 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1727 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1728
mgerdin@3829 1729 slow_locked_verify();
jmasa@3761 1730
jmasa@3761 1731 Metachunk* chunk = NULL;
jmasa@3947 1732 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1733 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1734 assert(free_list != NULL, "Sanity check");
jmasa@3761 1735
jmasa@3761 1736 chunk = free_list->head();
jmasa@3761 1737 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1738
jmasa@3761 1739 if (chunk == NULL) {
jmasa@3761 1740 return NULL;
jmasa@3761 1741 }
jmasa@3761 1742
coleenp@3602 1743 // Remove the chunk as the head of the list.
jmasa@4497 1744 free_list->remove_chunk(chunk);
jmasa@3947 1745
jmasa@3947 1746 // Chunk is being removed from the chunks free list.
jmasa@3761 1747 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1748
coleenp@3602 1749 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1750 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1751 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1752 free_list, chunk, chunk->word_size());
coleenp@3602 1753 }
coleenp@3602 1754 } else {
jmasa@3761 1755 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1756 word_size,
jmasa@3761 1757 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1758
jmasa@3761 1759 if (chunk != NULL) {
jmasa@3761 1760 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1761 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1762 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1763 " for requested size " SIZE_FORMAT
jmasa@3761 1764 " waste " SIZE_FORMAT,
jmasa@3761 1765 chunk->word_size(), word_size, waste);
coleenp@3602 1766 }
jmasa@3761 1767 // Chunk is being removed from the chunks free list.
jmasa@3761 1768 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3947 1769 } else {
jmasa@3947 1770 return NULL;
coleenp@3602 1771 }
coleenp@3602 1772 }
jmasa@3947 1773
jmasa@3947 1774 // Remove it from the links to this freelist
jmasa@3947 1775 chunk->set_next(NULL);
jmasa@3947 1776 chunk->set_prev(NULL);
jmasa@4572 1777 #ifdef ASSERT
jmasa@4572 1778 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
jmasa@4572 1779 // work.
jmasa@4572 1780 chunk->set_is_free(false);
jmasa@4572 1781 #endif
mgerdin@3829 1782 slow_locked_verify();
coleenp@3602 1783 return chunk;
coleenp@3602 1784 }
coleenp@3602 1785
coleenp@3602 1786 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1787 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1788 slow_locked_verify();
coleenp@3602 1789
coleenp@3602 1790 // Take from the beginning of the list
coleenp@3602 1791 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1792 if (chunk == NULL) {
coleenp@3602 1793 return NULL;
coleenp@3602 1794 }
coleenp@3602 1795
jmasa@3947 1796 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1797 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1798 "Non-humongous variable sized chunk");
coleenp@3602 1799 if (TraceMetadataChunkAllocation) {
jmasa@3947 1800 size_t list_count;
jmasa@3947 1801 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1802 ChunkList* list = find_free_chunks_list(word_size);
jmasa@4497 1803 list_count = list->count();
jmasa@3947 1804 } else {
jmasa@3947 1805 list_count = humongous_dictionary()->total_count();
jmasa@3947 1806 }
jmasa@3947 1807 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1808 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1809 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1810 locked_print_free_chunks(tty);
coleenp@3602 1811 }
coleenp@3602 1812
coleenp@3602 1813 return chunk;
coleenp@3602 1814 }
coleenp@3602 1815
jmasa@3761 1816 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1817 if (PrintFLSStatistics != 0) {
jmasa@3761 1818 humongous_dictionary()->report_statistics();
jmasa@3761 1819 }
jmasa@3761 1820 }
jmasa@3761 1821
coleenp@3602 1822 // SpaceManager methods
coleenp@3602 1823
jmasa@3947 1824 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1825 size_t* chunk_word_size,
jmasa@3947 1826 size_t* class_chunk_word_size) {
jmasa@3947 1827 switch (type) {
jmasa@3947 1828 case Metaspace::BootMetaspaceType:
jmasa@3947 1829 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1830 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1831 break;
jmasa@3947 1832 case Metaspace::ROMetaspaceType:
jmasa@3947 1833 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1834 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1835 break;
jmasa@3947 1836 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1837 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1838 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1839 break;
jmasa@3947 1840 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1841 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1842 *chunk_word_size = SpecializedChunk;
jmasa@3947 1843 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1844 break;
jmasa@3947 1845 default:
jmasa@3947 1846 *chunk_word_size = SmallChunk;
jmasa@3947 1847 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1848 break;
jmasa@3947 1849 }
mikael@4113 1850 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1851 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1852 " class " SIZE_FORMAT,
mikael@4113 1853 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1854 }
jmasa@3947 1855
coleenp@3602 1856 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1857 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1858 size_t free = 0;
jmasa@3947 1859 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1860 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1861 while (chunk != NULL) {
coleenp@3602 1862 free += chunk->free_word_size();
coleenp@3602 1863 chunk = chunk->next();
coleenp@3602 1864 }
coleenp@3602 1865 }
coleenp@3602 1866 return free;
coleenp@3602 1867 }
coleenp@3602 1868
coleenp@3602 1869 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1870 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1871 size_t result = 0;
jmasa@3947 1872 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1873 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1874 }
jmasa@3761 1875
coleenp@3602 1876 return result;
coleenp@3602 1877 }
coleenp@3602 1878
coleenp@3602 1879 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1880 size_t result = 0;
coleenp@3602 1881 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1882 // Count the free space in all the chunk but not the
coleenp@3602 1883 // current chunk from which allocations are still being done.
coleenp@4902 1884 while (chunk != NULL) {
coleenp@4902 1885 if (chunk != current_chunk()) {
jmasa@3761 1886 result += chunk->free_word_size();
coleenp@3602 1887 }
coleenp@4902 1888 chunk = chunk->next();
coleenp@3602 1889 }
coleenp@3602 1890 return result;
coleenp@3602 1891 }
coleenp@3602 1892
coleenp@3602 1893 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
jmasa@4580 1894 // For CMS use "allocated_chunks_words()" which does not need the
jmasa@4580 1895 // Metaspace lock. For the other collectors sum over the
jmasa@4580 1896 // lists. Use both methods as a check that "allocated_chunks_words()"
jmasa@4580 1897 // is correct. That is, sum_capacity_in_chunks() is too expensive
jmasa@4580 1898 // to use in the product and allocated_chunks_words() should be used
jmasa@4580 1899 // but allow for checking that allocated_chunks_words() returns the same
jmasa@4580 1900 // value as sum_capacity_in_chunks_in_use() which is the definitive
jmasa@4580 1901 // answer.
jmasa@4580 1902 if (UseConcMarkSweepGC) {
jmasa@4580 1903 return allocated_chunks_words();
jmasa@4580 1904 } else {
jmasa@4580 1905 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
jmasa@4580 1906 size_t sum = 0;
jmasa@4580 1907 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@4580 1908 Metachunk* chunk = chunks_in_use(i);
jmasa@4580 1909 while (chunk != NULL) {
jmasa@4580 1910 sum += chunk->capacity_word_size();
jmasa@4580 1911 chunk = chunk->next();
jmasa@4580 1912 }
coleenp@3602 1913 }
jmasa@4580 1914 return sum;
coleenp@3602 1915 }
coleenp@3602 1916 }
coleenp@3602 1917
coleenp@3602 1918 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1919 size_t count = 0;
jmasa@3947 1920 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1921 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1922 }
jmasa@3761 1923
coleenp@3602 1924 return count;
coleenp@3602 1925 }
coleenp@3602 1926
coleenp@3602 1927 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1928 size_t count = 0;
coleenp@3602 1929 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1930 while (chunk != NULL) {
coleenp@3602 1931 count++;
coleenp@3602 1932 chunk = chunk->next();
coleenp@3602 1933 }
coleenp@3602 1934 return count;
coleenp@3602 1935 }
coleenp@3602 1936
coleenp@3602 1937
coleenp@3602 1938 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1939 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1940 size_t used = 0;
jmasa@3947 1941 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1942 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1943 while (chunk != NULL) {
coleenp@3602 1944 used += chunk->used_word_size();
coleenp@3602 1945 chunk = chunk->next();
coleenp@3602 1946 }
coleenp@3602 1947 }
coleenp@3602 1948 return used;
coleenp@3602 1949 }
coleenp@3602 1950
coleenp@3602 1951 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1952
jmasa@3947 1953 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1954 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1955 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1956 chunk_size_name(i), chunk);
jmasa@3947 1957 if (chunk != NULL) {
jmasa@3947 1958 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1959 chunk->free_word_size());
jmasa@3947 1960 } else {
jmasa@3947 1961 st->print_cr("");
jmasa@3947 1962 }
jmasa@3947 1963 }
coleenp@3602 1964
coleenp@3602 1965 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1966 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1967 }
coleenp@3602 1968
coleenp@3602 1969 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1970
coleenp@3602 1971 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1972 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1973 // once a medium chunk has been allocated, no more small
coleenp@3602 1974 // chunks will be allocated.
coleenp@3602 1975 size_t chunk_word_size;
coleenp@3602 1976 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@4902 1977 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) {
jmasa@3947 1978 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1979 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1980 chunk_word_size = medium_chunk_size();
coleenp@3602 1981 }
coleenp@3602 1982 } else {
jmasa@3947 1983 chunk_word_size = medium_chunk_size();
coleenp@3602 1984 }
coleenp@3602 1985
jmasa@3947 1986 // Might still need a humongous chunk. Enforce an
jmasa@3947 1987 // eight word granularity to facilitate reuse (some
jmasa@3947 1988 // wastage but better chance of reuse).
jmasa@3947 1989 size_t if_humongous_sized_chunk =
jmasa@3947 1990 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1991 HumongousChunkGranularity);
coleenp@3602 1992 chunk_word_size =
jmasa@3947 1993 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1994
jmasa@3947 1995 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1996 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1997 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1998 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1999 word_size, chunk_word_size));
coleenp@3602 2000 if (TraceMetadataHumongousAllocation &&
coleenp@3602 2001 SpaceManager::is_humongous(word_size)) {
coleenp@3602 2002 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 2003 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 2004 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 2005 chunk_word_size);
jmasa@3761 2006 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 2007 Metachunk::overhead());
coleenp@3602 2008 }
coleenp@3602 2009 return chunk_word_size;
coleenp@3602 2010 }
coleenp@3602 2011
jmasa@3761 2012 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 2013 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 2014 "Should have been set");
coleenp@3602 2015 assert(current_chunk() == NULL ||
coleenp@3602 2016 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 2017 "Don't need to expand");
coleenp@3602 2018 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2019
coleenp@3602 2020 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2021 size_t words_left = 0;
jmasa@3947 2022 size_t words_used = 0;
jmasa@3947 2023 if (current_chunk() != NULL) {
jmasa@3947 2024 words_left = current_chunk()->free_word_size();
jmasa@3947 2025 words_used = current_chunk()->used_word_size();
jmasa@3947 2026 }
coleenp@3602 2027 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 2028 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 2029 " words left",
jmasa@3947 2030 word_size, words_used, words_left);
coleenp@3602 2031 }
coleenp@3602 2032
coleenp@3602 2033 // Get another chunk out of the virtual space
coleenp@3602 2034 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 2035 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 2036
coleenp@3602 2037 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 2038 // and do an allocation from it.
coleenp@3602 2039 if (next != NULL) {
coleenp@3602 2040 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 2041 // Add to this manager's list of chunks in use.
coleenp@3602 2042 add_chunk(next, false);
coleenp@3602 2043 return next->allocate(word_size);
coleenp@3602 2044 }
coleenp@3602 2045 return NULL;
coleenp@3602 2046 }
coleenp@3602 2047
coleenp@3602 2048 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 2049
jmasa@3947 2050 for (ChunkIndex i = ZeroIndex;
jmasa@3761 2051 i < NumberOfInUseLists ;
coleenp@3602 2052 i = next_chunk_index(i) ) {
coleenp@3602 2053 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 2054 chunks_in_use(i),
coleenp@3602 2055 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 2056 }
coleenp@3602 2057 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 2058 " Humongous " SIZE_FORMAT,
coleenp@3602 2059 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 2060 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 2061 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 2062 // block free lists
jmasa@3761 2063 if (block_freelists() != NULL) {
jmasa@3761 2064 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 2065 block_freelists()->total_size());
jmasa@3761 2066 }
coleenp@3602 2067 }
coleenp@3602 2068
jmasa@4727 2069 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
jmasa@4727 2070 Mutex* lock,
jmasa@3947 2071 VirtualSpaceList* vs_list) :
coleenp@3602 2072 _vs_list(vs_list),
jmasa@4727 2073 _mdtype(mdtype),
jmasa@4580 2074 _allocated_blocks_words(0),
jmasa@4580 2075 _allocated_chunks_words(0),
jmasa@4580 2076 _allocated_chunks_count(0),
jmasa@3947 2077 _lock(lock)
jmasa@3947 2078 {
jmasa@3947 2079 initialize();
jmasa@3947 2080 }
jmasa@3947 2081
jmasa@4580 2082 void SpaceManager::inc_size_metrics(size_t words) {
jmasa@4580 2083 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2084 // Total of allocated Metachunks and allocated Metachunks count
jmasa@4580 2085 // for each SpaceManager
jmasa@4580 2086 _allocated_chunks_words = _allocated_chunks_words + words;
jmasa@4580 2087 _allocated_chunks_count++;
jmasa@4580 2088 // Global total of capacity in allocated Metachunks
jmasa@4727 2089 MetaspaceAux::inc_capacity(mdtype(), words);
jmasa@4580 2090 // Global total of allocated Metablocks.
jmasa@4580 2091 // used_words_slow() includes the overhead in each
jmasa@4580 2092 // Metachunk so include it in the used when the
jmasa@4580 2093 // Metachunk is first added (so only added once per
jmasa@4580 2094 // Metachunk).
jmasa@4727 2095 MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
jmasa@4580 2096 }
jmasa@4580 2097
jmasa@4580 2098 void SpaceManager::inc_used_metrics(size_t words) {
jmasa@4580 2099 // Add to the per SpaceManager total
jmasa@4580 2100 Atomic::add_ptr(words, &_allocated_blocks_words);
jmasa@4580 2101 // Add to the global total
jmasa@4727 2102 MetaspaceAux::inc_used(mdtype(), words);
jmasa@4580 2103 }
jmasa@4580 2104
jmasa@4580 2105 void SpaceManager::dec_total_from_size_metrics() {
jmasa@4727 2106 MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
jmasa@4727 2107 MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
jmasa@4580 2108 // Also deduct the overhead per Metachunk
jmasa@4727 2109 MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
jmasa@4580 2110 }
jmasa@4580 2111
jmasa@3947 2112 void SpaceManager::initialize() {
coleenp@3602 2113 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 2114 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2115 _chunks_in_use[i] = NULL;
coleenp@3602 2116 }
coleenp@3602 2117 _current_chunk = NULL;
coleenp@3602 2118 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2119 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2120 }
coleenp@3602 2121 }
coleenp@3602 2122
jmasa@4497 2123 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
jmasa@4497 2124 if (chunks == NULL) {
jmasa@4497 2125 return;
jmasa@4497 2126 }
jmasa@4497 2127 ChunkList* list = free_chunks(index);
jmasa@4497 2128 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
jmasa@4497 2129 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4497 2130 Metachunk* cur = chunks;
jmasa@4497 2131
jmasa@4572 2132 // This returns chunks one at a time. If a new
jmasa@4497 2133 // class List can be created that is a base class
jmasa@4497 2134 // of FreeList then something like FreeList::prepend()
jmasa@4497 2135 // can be used in place of this loop
jmasa@4497 2136 while (cur != NULL) {
jmasa@4572 2137 assert(cur->container() != NULL, "Container should have been set");
jmasa@4572 2138 cur->container()->dec_container_count();
jmasa@4497 2139 // Capture the next link before it is changed
jmasa@4497 2140 // by the call to return_chunk_at_head();
jmasa@4497 2141 Metachunk* next = cur->next();
jmasa@4497 2142 cur->set_is_free(true);
jmasa@4497 2143 list->return_chunk_at_head(cur);
jmasa@4497 2144 cur = next;
jmasa@4497 2145 }
jmasa@4497 2146 }
jmasa@4497 2147
coleenp@3602 2148 SpaceManager::~SpaceManager() {
mgerdin@4349 2149 // This call this->_lock which can't be done while holding expand_lock()
jmasa@4580 2150 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
jmasa@4580 2151 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
jmasa@4580 2152 " allocated_chunks_words() " SIZE_FORMAT,
jmasa@4580 2153 sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
mgerdin@4349 2154
coleenp@3602 2155 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 2156 Mutex::_no_safepoint_check_flag);
coleenp@3602 2157
coleenp@3602 2158 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 2159
mgerdin@3829 2160 chunk_manager->slow_locked_verify();
coleenp@3602 2161
jmasa@4580 2162 dec_total_from_size_metrics();
jmasa@4580 2163
coleenp@3602 2164 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2165 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2166 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 2167 }
coleenp@3602 2168
jmasa@4572 2169 // Do not mangle freed Metachunks. The chunk size inside Metachunks
jmasa@4572 2170 // is during the freeing of a VirtualSpaceNodes.
coleenp@3869 2171
coleenp@3602 2172 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 2173 // below.
jmasa@4580 2174 chunk_manager->inc_free_chunks_total(allocated_chunks_words(),
coleenp@3602 2175 sum_count_in_chunks_in_use());
coleenp@3602 2176
coleenp@3602 2177 // Add all the chunks in use by this space manager
coleenp@3602 2178 // to the global list of free chunks.
coleenp@3602 2179
jmasa@3947 2180 // Follow each list of chunks-in-use and add them to the
jmasa@3947 2181 // free lists. Each list is NULL terminated.
jmasa@3947 2182
jmasa@3947 2183 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 2184 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2185 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 2186 sum_count_in_chunks_in_use(i),
jmasa@3947 2187 chunk_size_name(i));
jmasa@3947 2188 }
jmasa@3947 2189 Metachunk* chunks = chunks_in_use(i);
jmasa@4497 2190 chunk_manager->return_chunks(i, chunks);
jmasa@3947 2191 set_chunks_in_use(i, NULL);
jmasa@3947 2192 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2193 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@4497 2194 chunk_manager->free_chunks(i)->count(),
jmasa@3947 2195 chunk_size_name(i));
jmasa@3947 2196 }
jmasa@3947 2197 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 2198 }
coleenp@3602 2199
jmasa@3947 2200 // The medium chunk case may be optimized by passing the head and
jmasa@3947 2201 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 2202 // the current chunk but there are probably exceptions.
jmasa@3947 2203
coleenp@3602 2204 // Humongous chunks
jmasa@3947 2205 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2206 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 2207 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 2208 chunk_size_name(HumongousIndex));
jmasa@3947 2209 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 2210 }
coleenp@3602 2211 // Humongous chunks are never the current chunk.
coleenp@3602 2212 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2213
jmasa@3761 2214 while (humongous_chunks != NULL) {
jmasa@3761 2215 #ifdef ASSERT
jmasa@3761 2216 humongous_chunks->set_is_free(true);
jmasa@3761 2217 #endif
jmasa@3947 2218 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2219 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 2220 humongous_chunks,
jmasa@3947 2221 humongous_chunks->word_size());
jmasa@3947 2222 }
jmasa@3947 2223 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 2224 align_size_up(humongous_chunks->word_size(),
jmasa@3947 2225 HumongousChunkGranularity),
jmasa@3947 2226 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 2227 " granularity %d",
jmasa@3947 2228 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 2229 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@4572 2230 humongous_chunks->container()->dec_container_count();
jmasa@3761 2231 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2232 humongous_chunks = next_humongous_chunks;
coleenp@3602 2233 }
jmasa@3947 2234 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2235 gclog_or_tty->print_cr("");
jmasa@3947 2236 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 2237 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 2238 chunk_size_name(HumongousIndex));
jmasa@3947 2239 }
mgerdin@3829 2240 chunk_manager->slow_locked_verify();
coleenp@3602 2241 }
coleenp@3602 2242
jmasa@3947 2243 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 2244 switch (index) {
jmasa@3947 2245 case SpecializedIndex:
jmasa@3947 2246 return "Specialized";
jmasa@3947 2247 case SmallIndex:
jmasa@3947 2248 return "Small";
jmasa@3947 2249 case MediumIndex:
jmasa@3947 2250 return "Medium";
jmasa@3947 2251 case HumongousIndex:
jmasa@3947 2252 return "Humongous";
jmasa@3947 2253 default:
jmasa@3947 2254 return NULL;
jmasa@3947 2255 }
jmasa@3947 2256 }
jmasa@3947 2257
jmasa@3947 2258 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2259 switch (size) {
jmasa@3947 2260 case SpecializedChunk:
jmasa@3947 2261 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2262 "Need branch for ClassSpecializedChunk");
jmasa@3947 2263 return SpecializedIndex;
jmasa@3947 2264 case SmallChunk:
jmasa@3947 2265 case ClassSmallChunk:
jmasa@3947 2266 return SmallIndex;
jmasa@3947 2267 case MediumChunk:
jmasa@3947 2268 case ClassMediumChunk:
jmasa@3947 2269 return MediumIndex;
jmasa@3947 2270 default:
jmasa@3948 2271 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2272 "Not a humongous chunk");
jmasa@3947 2273 return HumongousIndex;
jmasa@3947 2274 }
jmasa@3947 2275 }
jmasa@3947 2276
jmasa@3761 2277 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2278 assert_lock_strong(_lock);
fparain@5017 2279 size_t raw_word_size = get_raw_word_size(word_size);
jmasa@3761 2280 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
fparain@5017 2281 assert(raw_word_size >= min_size,
hseigel@5093 2282 err_msg("Should not deallocate dark matter " SIZE_FORMAT "<" SIZE_FORMAT, word_size, min_size));
fparain@5017 2283 block_freelists()->return_block(p, raw_word_size);
coleenp@3602 2284 }
coleenp@3602 2285
coleenp@3602 2286 // Adds a chunk to the list of chunks in use.
coleenp@3602 2287 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2288
coleenp@3602 2289 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2290 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2291
coleenp@3602 2292 new_chunk->reset_empty();
coleenp@3602 2293
coleenp@3602 2294 // Find the correct list and and set the current
coleenp@3602 2295 // chunk for that list.
jmasa@3947 2296 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2297
jmasa@3947 2298 if (index != HumongousIndex) {
mgerdin@5264 2299 retire_current_chunk();
coleenp@3602 2300 set_current_chunk(new_chunk);
jmasa@3947 2301 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2302 set_chunks_in_use(index, new_chunk);
jmasa@3947 2303 } else {
coleenp@3602 2304 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2305 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2306 // chunk.
coleenp@3602 2307 if (make_current) {
coleenp@3602 2308 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2309 set_current_chunk(new_chunk);
coleenp@3602 2310 }
coleenp@3602 2311 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2312 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2313 // any humongous chunks so will not point to the tail
coleenp@3602 2314 // of the humongous chunks list.
coleenp@3602 2315 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2316 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2317
jmasa@3948 2318 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2319 }
coleenp@3602 2320
jmasa@4580 2321 // Add to the running sum of capacity
jmasa@4580 2322 inc_size_metrics(new_chunk->word_size());
jmasa@4580 2323
coleenp@3602 2324 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2325 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2326 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2327 sum_count_in_chunks_in_use());
coleenp@3602 2328 new_chunk->print_on(gclog_or_tty);
jmasa@4580 2329 if (vs_list() != NULL) {
jmasa@4580 2330 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
jmasa@4580 2331 }
coleenp@3602 2332 }
coleenp@3602 2333 }
coleenp@3602 2334
mgerdin@5264 2335 void SpaceManager::retire_current_chunk() {
mgerdin@5264 2336 if (current_chunk() != NULL) {
mgerdin@5264 2337 size_t remaining_words = current_chunk()->free_word_size();
mgerdin@5264 2338 if (remaining_words >= TreeChunk<Metablock, FreeList>::min_size()) {
mgerdin@5264 2339 block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words);
mgerdin@5264 2340 inc_used_metrics(remaining_words);
mgerdin@5264 2341 }
mgerdin@5264 2342 }
mgerdin@5264 2343 }
mgerdin@5264 2344
jmasa@3947 2345 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2346 size_t grow_chunks_by_words) {
jmasa@3947 2347
jmasa@3947 2348 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2349 grow_chunks_by_words,
jmasa@3947 2350 medium_chunk_bunch());
jmasa@3947 2351
jmasa@3947 2352 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2353 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2354 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2355 next->word_size());
jmasa@3947 2356 }
jmasa@3947 2357
jmasa@3947 2358 return next;
jmasa@3947 2359 }
jmasa@3947 2360
coleenp@3602 2361 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2362 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2363
iklam@4773 2364 size_t raw_word_size = get_raw_word_size(word_size);
coleenp@3602 2365 BlockFreelist* fl = block_freelists();
jmasa@3761 2366 MetaWord* p = NULL;
coleenp@3602 2367 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2368 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2369 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2370 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2371 // for allocations. Do some profiling. JJJ
jmasa@3761 2372 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2373 p = fl->get_block(raw_word_size);
coleenp@3602 2374 }
jmasa@3761 2375 if (p == NULL) {
jmasa@3761 2376 p = allocate_work(raw_word_size);
coleenp@3602 2377 }
coleenp@3602 2378 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2379
jmasa@3761 2380 return p;
coleenp@3602 2381 }
coleenp@3602 2382
coleenp@3602 2383 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2384 // This methods does not know about blocks (Metablocks)
jmasa@3761 2385 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2386 assert_lock_strong(_lock);
coleenp@3602 2387 #ifdef ASSERT
coleenp@3602 2388 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2389 return NULL;
coleenp@3602 2390 }
coleenp@3602 2391 #endif
coleenp@3602 2392 // Is there space in the current chunk?
jmasa@3761 2393 MetaWord* result = NULL;
coleenp@3602 2394
coleenp@3602 2395 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2396 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2397 // of memory if this returns null.
coleenp@3602 2398 if (DumpSharedSpaces) {
coleenp@3602 2399 assert(current_chunk() != NULL, "should never happen");
jmasa@4580 2400 inc_used_metrics(word_size);
coleenp@3602 2401 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2402 }
coleenp@3602 2403 if (current_chunk() != NULL) {
coleenp@3602 2404 result = current_chunk()->allocate(word_size);
coleenp@3602 2405 }
coleenp@3602 2406
coleenp@3602 2407 if (result == NULL) {
coleenp@3602 2408 result = grow_and_allocate(word_size);
coleenp@3602 2409 }
hseigel@5093 2410 if (result != 0) {
jmasa@4580 2411 inc_used_metrics(word_size);
jmasa@3761 2412 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2413 "Head of the list is being allocated");
coleenp@3602 2414 }
coleenp@3602 2415
coleenp@3602 2416 return result;
coleenp@3602 2417 }
coleenp@3602 2418
coleenp@3602 2419 void SpaceManager::verify() {
coleenp@3602 2420 // If there are blocks in the dictionary, then
coleenp@3602 2421 // verfication of chunks does not work since
coleenp@3602 2422 // being in the dictionary alters a chunk.
jmasa@3761 2423 if (block_freelists()->total_size() == 0) {
jmasa@3947 2424 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2425 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2426 while (curr != NULL) {
coleenp@3602 2427 curr->verify();
jmasa@3892 2428 verify_chunk_size(curr);
coleenp@3602 2429 curr = curr->next();
coleenp@3602 2430 }
coleenp@3602 2431 }
coleenp@3602 2432 }
coleenp@3602 2433 }
coleenp@3602 2434
jmasa@3892 2435 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2436 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2437 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2438 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2439 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2440 "Chunk size is wrong");
jmasa@3892 2441 return;
jmasa@3892 2442 }
jmasa@3892 2443
coleenp@3602 2444 #ifdef ASSERT
jmasa@4580 2445 void SpaceManager::verify_allocated_blocks_words() {
coleenp@3602 2446 // Verification is only guaranteed at a safepoint.
jmasa@4580 2447 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
jmasa@4580 2448 "Verification can fail if the applications is running");
jmasa@4580 2449 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
mikael@4113 2450 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2451 " vs " SIZE_FORMAT,
jmasa@4580 2452 allocated_blocks_words(), sum_used_in_chunks_in_use()));
coleenp@3602 2453 }
coleenp@3602 2454
coleenp@3602 2455 #endif
coleenp@3602 2456
coleenp@3602 2457 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2458 size_t curr_total = 0;
coleenp@3602 2459 size_t waste = 0;
coleenp@3602 2460 uint i = 0;
coleenp@3602 2461 size_t used = 0;
coleenp@3602 2462 size_t capacity = 0;
coleenp@3602 2463
coleenp@3602 2464 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2465 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2466 index < NumberOfInUseLists;
coleenp@3602 2467 index = next_chunk_index(index)) {
coleenp@3602 2468 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2469 curr != NULL;
coleenp@3602 2470 curr = curr->next()) {
coleenp@3602 2471 out->print("%d) ", i++);
coleenp@3602 2472 curr->print_on(out);
coleenp@3602 2473 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2474 block_freelists()->print_on(out);
coleenp@3602 2475 }
coleenp@3602 2476 curr_total += curr->word_size();
coleenp@3602 2477 used += curr->used_word_size();
coleenp@3602 2478 capacity += curr->capacity_word_size();
coleenp@3602 2479 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2480 }
coleenp@3602 2481 }
coleenp@3602 2482
jmasa@3947 2483 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2484 // Free space isn't wasted.
coleenp@3602 2485 waste -= free;
coleenp@3602 2486
coleenp@3602 2487 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2488 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2489 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2490 }
coleenp@3602 2491
coleenp@3869 2492 #ifndef PRODUCT
coleenp@3602 2493 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2494 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2495 index < NumberOfInUseLists;
coleenp@3602 2496 index = next_chunk_index(index)) {
coleenp@3602 2497 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2498 curr != NULL;
coleenp@3602 2499 curr = curr->next()) {
coleenp@3602 2500 curr->mangle();
coleenp@3602 2501 }
coleenp@3602 2502 }
coleenp@3602 2503 }
coleenp@3869 2504 #endif // PRODUCT
coleenp@3602 2505
coleenp@3602 2506 // MetaspaceAux
coleenp@3602 2507
jmasa@4580 2508
jmasa@4727 2509 size_t MetaspaceAux::_allocated_capacity_words[] = {0, 0};
jmasa@4727 2510 size_t MetaspaceAux::_allocated_used_words[] = {0, 0};
jmasa@4580 2511
ehelin@5096 2512 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
ehelin@5096 2513 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
ehelin@5096 2514 return list == NULL ? 0 : list->free_bytes();
ehelin@5096 2515 }
ehelin@5096 2516
jmasa@4580 2517 size_t MetaspaceAux::free_bytes() {
ehelin@5096 2518 return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
jmasa@4580 2519 }
jmasa@4580 2520
jmasa@4727 2521 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2522 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4727 2523 assert(words <= allocated_capacity_words(mdtype),
jmasa@4580 2524 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4727 2525 " is greater than _allocated_capacity_words[%u] " SIZE_FORMAT,
jmasa@4727 2526 words, mdtype, allocated_capacity_words(mdtype)));
jmasa@4727 2527 _allocated_capacity_words[mdtype] -= words;
jmasa@4580 2528 }
jmasa@4580 2529
jmasa@4727 2530 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2531 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2532 // Needs to be atomic
jmasa@4727 2533 _allocated_capacity_words[mdtype] += words;
jmasa@4580 2534 }
jmasa@4580 2535
jmasa@4727 2536 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4727 2537 assert(words <= allocated_used_words(mdtype),
jmasa@4580 2538 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4727 2539 " is greater than _allocated_used_words[%u] " SIZE_FORMAT,
jmasa@4727 2540 words, mdtype, allocated_used_words(mdtype)));
jmasa@4580 2541 // For CMS deallocation of the Metaspaces occurs during the
jmasa@4580 2542 // sweep which is a concurrent phase. Protection by the expand_lock()
jmasa@4580 2543 // is not enough since allocation is on a per Metaspace basis
jmasa@4580 2544 // and protected by the Metaspace lock.
jmasa@4580 2545 jlong minus_words = (jlong) - (jlong) words;
jmasa@4727 2546 Atomic::add_ptr(minus_words, &_allocated_used_words[mdtype]);
jmasa@4580 2547 }
jmasa@4580 2548
jmasa@4727 2549 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2550 // _allocated_used_words tracks allocations for
jmasa@4580 2551 // each piece of metadata. Those allocations are
jmasa@4580 2552 // generally done concurrently by different application
jmasa@4580 2553 // threads so must be done atomically.
jmasa@4727 2554 Atomic::add_ptr(words, &_allocated_used_words[mdtype]);
jmasa@4580 2555 }
jmasa@4580 2556
jmasa@4580 2557 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@3607 2558 size_t used = 0;
jmasa@3607 2559 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2560 while (iter.repeat()) {
jmasa@3607 2561 Metaspace* msp = iter.get_next();
jmasa@4580 2562 // Sum allocated_blocks_words for each metaspace
jmasa@3607 2563 if (msp != NULL) {
jmasa@4580 2564 used += msp->used_words_slow(mdtype);
jmasa@3607 2565 }
jmasa@3607 2566 }
jmasa@3607 2567 return used * BytesPerWord;
jmasa@3607 2568 }
jmasa@3607 2569
ehelin@5268 2570 size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) {
coleenp@3602 2571 size_t free = 0;
coleenp@3602 2572 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2573 while (iter.repeat()) {
coleenp@3602 2574 Metaspace* msp = iter.get_next();
coleenp@3602 2575 if (msp != NULL) {
ehelin@5268 2576 free += msp->free_words_slow(mdtype);
coleenp@3602 2577 }
coleenp@3602 2578 }
coleenp@3602 2579 return free * BytesPerWord;
coleenp@3602 2580 }
coleenp@3602 2581
jmasa@4580 2582 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
hseigel@5093 2583 if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
hseigel@5093 2584 return 0;
hseigel@5093 2585 }
jmasa@4580 2586 // Don't count the space in the freelists. That space will be
jmasa@4580 2587 // added to the capacity calculation as needed.
jmasa@4580 2588 size_t capacity = 0;
coleenp@3602 2589 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2590 while (iter.repeat()) {
coleenp@3602 2591 Metaspace* msp = iter.get_next();
coleenp@3602 2592 if (msp != NULL) {
jmasa@4580 2593 capacity += msp->capacity_words_slow(mdtype);
coleenp@3602 2594 }
coleenp@3602 2595 }
coleenp@3602 2596 return capacity * BytesPerWord;
coleenp@3602 2597 }
coleenp@3602 2598
ehelin@5268 2599 size_t MetaspaceAux::capacity_bytes_slow() {
ehelin@5268 2600 #ifdef PRODUCT
ehelin@5268 2601 // Use allocated_capacity_bytes() in PRODUCT instead of this function.
ehelin@5268 2602 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
ehelin@5268 2603 #endif
ehelin@5268 2604 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
ehelin@5268 2605 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
ehelin@5268 2606 assert(allocated_capacity_bytes() == class_capacity + non_class_capacity,
ehelin@5268 2607 err_msg("bad accounting: allocated_capacity_bytes() " SIZE_FORMAT
ehelin@5268 2608 " class_capacity + non_class_capacity " SIZE_FORMAT
ehelin@5268 2609 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
ehelin@5268 2610 allocated_capacity_bytes(), class_capacity + non_class_capacity,
ehelin@5268 2611 class_capacity, non_class_capacity));
ehelin@5268 2612
ehelin@5268 2613 return class_capacity + non_class_capacity;
ehelin@5268 2614 }
ehelin@5268 2615
ehelin@5268 2616 size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) {
ehelin@5096 2617 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
ehelin@5268 2618 return list == NULL ? 0 : list->virtual_space_total() * BytesPerWord;
coleenp@3602 2619 }
coleenp@3602 2620
ehelin@5268 2621 size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
ehelin@5268 2622
ehelin@5268 2623 size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) {
ehelin@5096 2624 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
ehelin@5096 2625 if (list == NULL) {
hseigel@5093 2626 return 0;
hseigel@5093 2627 }
ehelin@5096 2628 ChunkManager* chunk = list->chunk_manager();
mgerdin@3829 2629 chunk->slow_verify();
ehelin@5268 2630 return chunk->free_chunks_total_words();
coleenp@3602 2631 }
coleenp@3602 2632
ehelin@5268 2633 size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
ehelin@5268 2634 return free_chunks_total_words(mdtype) * BytesPerWord;
coleenp@3602 2635 }
coleenp@3602 2636
ehelin@5268 2637 size_t MetaspaceAux::free_chunks_total_words() {
ehelin@5268 2638 return free_chunks_total_words(Metaspace::ClassType) +
ehelin@5268 2639 free_chunks_total_words(Metaspace::NonClassType);
jmasa@4580 2640 }
jmasa@4580 2641
ehelin@5268 2642 size_t MetaspaceAux::free_chunks_total_bytes() {
ehelin@5268 2643 return free_chunks_total_words() * BytesPerWord;
jmasa@4580 2644 }
jmasa@4580 2645
coleenp@3602 2646 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2647 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2648 if (PrintGCDetails && Verbose) {
coleenp@3602 2649 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2650 "->" SIZE_FORMAT
jmasa@4580 2651 "(" SIZE_FORMAT ")",
coleenp@3602 2652 prev_metadata_used,
jmasa@4875 2653 allocated_used_bytes(),
ehelin@5268 2654 reserved_bytes());
coleenp@3602 2655 } else {
coleenp@3602 2656 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2657 "->" SIZE_FORMAT "K"
jmasa@4580 2658 "(" SIZE_FORMAT "K)",
ehelin@5268 2659 prev_metadata_used/K,
ehelin@5268 2660 allocated_used_bytes()/K,
ehelin@5268 2661 reserved_bytes()/K);
coleenp@3602 2662 }
coleenp@3602 2663
coleenp@3602 2664 gclog_or_tty->print("]");
coleenp@3602 2665 }
coleenp@3602 2666
coleenp@3602 2667 // This is printed when PrintGCDetails
coleenp@3602 2668 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2669 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2670
coleenp@3602 2671 out->print_cr(" Metaspace total "
coleenp@3602 2672 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2673 " reserved " SIZE_FORMAT "K",
ehelin@5268 2674 allocated_capacity_bytes()/K, allocated_used_bytes()/K, reserved_bytes()/K);
jmasa@4727 2675
jmasa@4727 2676 out->print_cr(" data space "
jmasa@4727 2677 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4727 2678 " reserved " SIZE_FORMAT "K",
jmasa@4727 2679 allocated_capacity_bytes(nct)/K,
jmasa@4727 2680 allocated_used_bytes(nct)/K,
ehelin@5268 2681 reserved_bytes(nct)/K);
hseigel@5093 2682 if (Metaspace::using_class_space()) {
hseigel@5093 2683 Metaspace::MetadataType ct = Metaspace::ClassType;
hseigel@5093 2684 out->print_cr(" class space "
hseigel@5093 2685 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
hseigel@5093 2686 " reserved " SIZE_FORMAT "K",
hseigel@5093 2687 allocated_capacity_bytes(ct)/K,
hseigel@5093 2688 allocated_used_bytes(ct)/K,
ehelin@5268 2689 reserved_bytes(ct)/K);
hseigel@5093 2690 }
coleenp@3602 2691 }
coleenp@3602 2692
coleenp@3602 2693 // Print information for class space and data space separately.
coleenp@3602 2694 // This is almost the same as above.
coleenp@3602 2695 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
ehelin@5268 2696 size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
jmasa@4580 2697 size_t capacity_bytes = capacity_bytes_slow(mdtype);
jmasa@4580 2698 size_t used_bytes = used_bytes_slow(mdtype);
ehelin@5268 2699 size_t free_bytes = free_bytes_slow(mdtype);
coleenp@3602 2700 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2701 free_chunks_capacity_bytes;
coleenp@3602 2702 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2703 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2704 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2705 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2706 used_bytes / K,
coleenp@3602 2707 free_bytes / K,
coleenp@3602 2708 free_chunks_capacity_bytes / K,
coleenp@3602 2709 used_and_free / K,
coleenp@3602 2710 capacity_bytes / K);
mgerdin@4303 2711 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2712 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2713 }
coleenp@3602 2714
hseigel@5093 2715 // Print total fragmentation for class metaspaces
hseigel@5093 2716 void MetaspaceAux::print_class_waste(outputStream* out) {
hseigel@5093 2717 assert(Metaspace::using_class_space(), "class metaspace not used");
hseigel@5093 2718 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
hseigel@5093 2719 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
hseigel@5093 2720 ClassLoaderDataGraphMetaspaceIterator iter;
hseigel@5093 2721 while (iter.repeat()) {
hseigel@5093 2722 Metaspace* msp = iter.get_next();
hseigel@5093 2723 if (msp != NULL) {
hseigel@5093 2724 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
hseigel@5093 2725 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
hseigel@5093 2726 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
hseigel@5093 2727 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
hseigel@5093 2728 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
hseigel@5093 2729 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
hseigel@5093 2730 cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
hseigel@5093 2731 }
hseigel@5093 2732 }
hseigel@5093 2733 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
hseigel@5093 2734 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
hseigel@5093 2735 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
hseigel@5093 2736 "large count " SIZE_FORMAT,
hseigel@5093 2737 cls_specialized_count, cls_specialized_waste,
hseigel@5093 2738 cls_small_count, cls_small_waste,
hseigel@5093 2739 cls_medium_count, cls_medium_waste, cls_humongous_count);
hseigel@5093 2740 }
hseigel@5093 2741
hseigel@5093 2742 // Print total fragmentation for data and class metaspaces separately
coleenp@3602 2743 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@4902 2744 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
coleenp@4902 2745 size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
coleenp@3602 2746
coleenp@3602 2747 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2748 while (iter.repeat()) {
coleenp@3602 2749 Metaspace* msp = iter.get_next();
coleenp@3602 2750 if (msp != NULL) {
jmasa@3947 2751 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2752 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2753 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2754 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2755 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2756 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@4902 2757 humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2758 }
coleenp@3602 2759 }
coleenp@3602 2760 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2761 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2762 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
coleenp@4902 2763 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
coleenp@4902 2764 "large count " SIZE_FORMAT,
jmasa@3947 2765 specialized_count, specialized_waste, small_count,
coleenp@4902 2766 small_waste, medium_count, medium_waste, humongous_count);
hseigel@5093 2767 if (Metaspace::using_class_space()) {
hseigel@5093 2768 print_class_waste(out);
hseigel@5093 2769 }
coleenp@3602 2770 }
coleenp@3602 2771
coleenp@3602 2772 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2773 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2774 out->print_cr("All Metaspace:");
coleenp@3602 2775 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2776 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2777 print_waste(out);
coleenp@3602 2778 }
coleenp@3602 2779
mgerdin@3829 2780 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2781 Metaspace::space_list()->chunk_manager()->verify();
hseigel@5093 2782 if (Metaspace::using_class_space()) {
hseigel@5093 2783 Metaspace::class_space_list()->chunk_manager()->verify();
hseigel@5093 2784 }
mgerdin@3829 2785 }
mgerdin@3829 2786
jmasa@4580 2787 void MetaspaceAux::verify_capacity() {
jmasa@4580 2788 #ifdef ASSERT
jmasa@4580 2789 size_t running_sum_capacity_bytes = allocated_capacity_bytes();
jmasa@4727 2790 // For purposes of the running sum of capacity, verify against capacity
jmasa@4580 2791 size_t capacity_in_use_bytes = capacity_bytes_slow();
jmasa@4580 2792 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
jmasa@4580 2793 err_msg("allocated_capacity_words() * BytesPerWord " SIZE_FORMAT
jmasa@4580 2794 " capacity_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2795 running_sum_capacity_bytes, capacity_in_use_bytes));
jmasa@4727 2796 for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@4727 2797 i < Metaspace:: MetadataTypeCount;
jmasa@4727 2798 i = (Metaspace::MetadataType)(i + 1)) {
jmasa@4727 2799 size_t capacity_in_use_bytes = capacity_bytes_slow(i);
jmasa@4727 2800 assert(allocated_capacity_bytes(i) == capacity_in_use_bytes,
jmasa@4727 2801 err_msg("allocated_capacity_bytes(%u) " SIZE_FORMAT
jmasa@4727 2802 " capacity_bytes_slow(%u)" SIZE_FORMAT,
jmasa@4727 2803 i, allocated_capacity_bytes(i), i, capacity_in_use_bytes));
jmasa@4727 2804 }
jmasa@4580 2805 #endif
jmasa@4580 2806 }
jmasa@4580 2807
jmasa@4580 2808 void MetaspaceAux::verify_used() {
jmasa@4580 2809 #ifdef ASSERT
jmasa@4580 2810 size_t running_sum_used_bytes = allocated_used_bytes();
jmasa@4727 2811 // For purposes of the running sum of used, verify against used
jmasa@4580 2812 size_t used_in_use_bytes = used_bytes_slow();
jmasa@4580 2813 assert(allocated_used_bytes() == used_in_use_bytes,
jmasa@4580 2814 err_msg("allocated_used_bytes() " SIZE_FORMAT
jmasa@4727 2815 " used_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2816 allocated_used_bytes(), used_in_use_bytes));
jmasa@4727 2817 for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@4727 2818 i < Metaspace:: MetadataTypeCount;
jmasa@4727 2819 i = (Metaspace::MetadataType)(i + 1)) {
jmasa@4727 2820 size_t used_in_use_bytes = used_bytes_slow(i);
jmasa@4727 2821 assert(allocated_used_bytes(i) == used_in_use_bytes,
jmasa@4727 2822 err_msg("allocated_used_bytes(%u) " SIZE_FORMAT
jmasa@4727 2823 " used_bytes_slow(%u)" SIZE_FORMAT,
jmasa@4727 2824 i, allocated_used_bytes(i), i, used_in_use_bytes));
jmasa@4727 2825 }
jmasa@4580 2826 #endif
jmasa@4580 2827 }
jmasa@4580 2828
jmasa@4580 2829 void MetaspaceAux::verify_metrics() {
jmasa@4580 2830 verify_capacity();
jmasa@4580 2831 verify_used();
jmasa@4580 2832 }
jmasa@4580 2833
jmasa@4580 2834
coleenp@3602 2835 // Metaspace methods
coleenp@3602 2836
coleenp@3602 2837 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2838 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2839
jmasa@3947 2840 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2841 initialize(lock, type);
coleenp@3602 2842 }
coleenp@3602 2843
coleenp@3602 2844 Metaspace::~Metaspace() {
coleenp@3602 2845 delete _vsm;
hseigel@5093 2846 if (using_class_space()) {
hseigel@5093 2847 delete _class_vsm;
hseigel@5093 2848 }
coleenp@3602 2849 }
coleenp@3602 2850
coleenp@3602 2851 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2852 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2853
coleenp@3602 2854 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2855
hseigel@5093 2856 #ifdef _LP64
hseigel@5093 2857 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
hseigel@5093 2858 // Figure out the narrow_klass_base and the narrow_klass_shift. The
hseigel@5093 2859 // narrow_klass_base is the lower of the metaspace base and the cds base
hseigel@5093 2860 // (if cds is enabled). The narrow_klass_shift depends on the distance
hseigel@5093 2861 // between the lower base and higher address.
hseigel@5093 2862 address lower_base;
hseigel@5093 2863 address higher_address;
hseigel@5093 2864 if (UseSharedSpaces) {
hseigel@5093 2865 higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
hseigel@5093 2866 (address)(metaspace_base + class_metaspace_size()));
hseigel@5093 2867 lower_base = MIN2(metaspace_base, cds_base);
hseigel@5093 2868 } else {
hseigel@5093 2869 higher_address = metaspace_base + class_metaspace_size();
hseigel@5093 2870 lower_base = metaspace_base;
hseigel@5093 2871 }
hseigel@5093 2872 Universe::set_narrow_klass_base(lower_base);
hseigel@5093 2873 if ((uint64_t)(higher_address - lower_base) < (uint64_t)max_juint) {
hseigel@5093 2874 Universe::set_narrow_klass_shift(0);
hseigel@5093 2875 } else {
hseigel@5093 2876 assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
hseigel@5093 2877 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
hseigel@5093 2878 }
hseigel@5093 2879 }
hseigel@5093 2880
hseigel@5093 2881 // Return TRUE if the specified metaspace_base and cds_base are close enough
hseigel@5093 2882 // to work with compressed klass pointers.
hseigel@5093 2883 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
hseigel@5093 2884 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
ehelin@5259 2885 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
hseigel@5093 2886 address lower_base = MIN2((address)metaspace_base, cds_base);
hseigel@5093 2887 address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
hseigel@5093 2888 (address)(metaspace_base + class_metaspace_size()));
hseigel@5093 2889 return ((uint64_t)(higher_address - lower_base) < (uint64_t)max_juint);
hseigel@5093 2890 }
hseigel@5093 2891
hseigel@5093 2892 // Try to allocate the metaspace at the requested addr.
hseigel@5093 2893 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
hseigel@5093 2894 assert(using_class_space(), "called improperly");
ehelin@5259 2895 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
hseigel@5093 2896 assert(class_metaspace_size() < KlassEncodingMetaspaceMax,
hseigel@5093 2897 "Metaspace size is too big");
hseigel@5093 2898
hseigel@5093 2899 ReservedSpace metaspace_rs = ReservedSpace(class_metaspace_size(),
hseigel@5093 2900 os::vm_allocation_granularity(),
hseigel@5093 2901 false, requested_addr, 0);
hseigel@5093 2902 if (!metaspace_rs.is_reserved()) {
hseigel@5093 2903 if (UseSharedSpaces) {
hseigel@5093 2904 // Keep trying to allocate the metaspace, increasing the requested_addr
hseigel@5093 2905 // by 1GB each time, until we reach an address that will no longer allow
hseigel@5093 2906 // use of CDS with compressed klass pointers.
hseigel@5093 2907 char *addr = requested_addr;
hseigel@5093 2908 while (!metaspace_rs.is_reserved() && (addr + 1*G > addr) &&
hseigel@5093 2909 can_use_cds_with_metaspace_addr(addr + 1*G, cds_base)) {
hseigel@5093 2910 addr = addr + 1*G;
hseigel@5093 2911 metaspace_rs = ReservedSpace(class_metaspace_size(),
hseigel@5093 2912 os::vm_allocation_granularity(), false, addr, 0);
hseigel@5093 2913 }
hseigel@5093 2914 }
hseigel@5093 2915
hseigel@5093 2916 // If no successful allocation then try to allocate the space anywhere. If
hseigel@5093 2917 // that fails then OOM doom. At this point we cannot try allocating the
ehelin@5259 2918 // metaspace as if UseCompressedClassPointers is off because too much
ehelin@5259 2919 // initialization has happened that depends on UseCompressedClassPointers.
ehelin@5259 2920 // So, UseCompressedClassPointers cannot be turned off at this point.
hseigel@5093 2921 if (!metaspace_rs.is_reserved()) {
hseigel@5093 2922 metaspace_rs = ReservedSpace(class_metaspace_size(),
hseigel@5093 2923 os::vm_allocation_granularity(), false);
hseigel@5093 2924 if (!metaspace_rs.is_reserved()) {
hseigel@5093 2925 vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes",
hseigel@5093 2926 class_metaspace_size()));
hseigel@5093 2927 }
hseigel@5093 2928 }
hseigel@5093 2929 }
hseigel@5093 2930
hseigel@5093 2931 // If we got here then the metaspace got allocated.
hseigel@5093 2932 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
hseigel@5093 2933
hseigel@5093 2934 // Verify that we can use shared spaces. Otherwise, turn off CDS.
hseigel@5093 2935 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
hseigel@5093 2936 FileMapInfo::stop_sharing_and_unmap(
hseigel@5093 2937 "Could not allocate metaspace at a compatible address");
hseigel@5093 2938 }
hseigel@5093 2939
hseigel@5093 2940 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
hseigel@5093 2941 UseSharedSpaces ? (address)cds_base : 0);
hseigel@5093 2942
hseigel@5093 2943 initialize_class_space(metaspace_rs);
hseigel@5093 2944
hseigel@5093 2945 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
hseigel@5093 2946 gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
hseigel@5093 2947 Universe::narrow_klass_base(), Universe::narrow_klass_shift());
hseigel@5093 2948 gclog_or_tty->print_cr("Metaspace Size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
hseigel@5093 2949 class_metaspace_size(), metaspace_rs.base(), requested_addr);
hseigel@5093 2950 }
hseigel@5093 2951 }
hseigel@5093 2952
ehelin@5259 2953 // For UseCompressedClassPointers the class space is reserved above the top of
hseigel@5093 2954 // the Java heap. The argument passed in is at the base of the compressed space.
hseigel@5093 2955 void Metaspace::initialize_class_space(ReservedSpace rs) {
hseigel@5093 2956 // The reserved space size may be bigger because of alignment, esp with UseLargePages
ehelin@5259 2957 assert(rs.size() >= CompressedClassSpaceSize,
ehelin@5259 2958 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), CompressedClassSpaceSize));
hseigel@5093 2959 assert(using_class_space(), "Must be using class space");
hseigel@5093 2960 _class_space_list = new VirtualSpaceList(rs);
hseigel@5093 2961 }
hseigel@5093 2962
hseigel@5093 2963 #endif
hseigel@5093 2964
coleenp@3602 2965 void Metaspace::global_initialize() {
coleenp@3602 2966 // Initialize the alignment for shared spaces.
coleenp@3602 2967 int max_alignment = os::vm_page_size();
hseigel@5093 2968 size_t cds_total = 0;
hseigel@5093 2969
ehelin@5259 2970 set_class_metaspace_size(align_size_up(CompressedClassSpaceSize,
hseigel@5093 2971 os::vm_allocation_granularity()));
hseigel@5093 2972
coleenp@3602 2973 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2974
coleenp@3602 2975 if (DumpSharedSpaces) {
coleenp@3602 2976 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2977 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2978 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2979 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2980
coleenp@3602 2981 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2982 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2983 // remainder is the misc code and data chunks.
hseigel@5093 2984 cds_total = FileMapInfo::shared_spaces_size();
hseigel@5093 2985 _space_list = new VirtualSpaceList(cds_total/wordSize);
hseigel@5093 2986
hseigel@5093 2987 #ifdef _LP64
hseigel@5093 2988 // Set the compressed klass pointer base so that decoding of these pointers works
hseigel@5093 2989 // properly when creating the shared archive.
ehelin@5259 2990 assert(UseCompressedOops && UseCompressedClassPointers,
ehelin@5259 2991 "UseCompressedOops and UseCompressedClassPointers must be set");
hseigel@5093 2992 Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom());
hseigel@5093 2993 if (TraceMetavirtualspaceAllocation && Verbose) {
hseigel@5093 2994 gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT,
hseigel@5093 2995 _space_list->current_virtual_space()->bottom());
hseigel@5093 2996 }
hseigel@5093 2997
hseigel@5093 2998 // Set the shift to zero.
hseigel@5093 2999 assert(class_metaspace_size() < (uint64_t)(max_juint) - cds_total,
hseigel@5093 3000 "CDS region is too large");
hseigel@5093 3001 Universe::set_narrow_klass_shift(0);
hseigel@5093 3002 #endif
hseigel@5093 3003
coleenp@3602 3004 } else {
coleenp@3602 3005 // If using shared space, open the file that contains the shared space
coleenp@3602 3006 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 3007 // the addresses don't conflict)
hseigel@5093 3008 address cds_address = NULL;
coleenp@3602 3009 if (UseSharedSpaces) {
coleenp@3602 3010 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 3011 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 3012
coleenp@3602 3013 // Open the shared archive file, read and validate the header. If
coleenp@3602 3014 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 3015 // disabled and the file is closed.
coleenp@3602 3016 // Map in spaces now also
coleenp@3602 3017 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 3018 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 3019 } else {
coleenp@3602 3020 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 3021 "archive file not closed or shared spaces not disabled.");
coleenp@3602 3022 }
hseigel@5093 3023 cds_total = FileMapInfo::shared_spaces_size();
hseigel@5093 3024 cds_address = (address)mapinfo->region_base(0);
coleenp@3602 3025 }
coleenp@3602 3026
hseigel@5093 3027 #ifdef _LP64
ehelin@5259 3028 // If UseCompressedClassPointers is set then allocate the metaspace area
hseigel@5093 3029 // above the heap and above the CDS area (if it exists).
hseigel@5093 3030 if (using_class_space()) {
hseigel@5093 3031 if (UseSharedSpaces) {
hseigel@5093 3032 allocate_metaspace_compressed_klass_ptrs((char *)(cds_address + cds_total), cds_address);
hseigel@5093 3033 } else {
hseigel@5093 3034 allocate_metaspace_compressed_klass_ptrs((char *)CompressedKlassPointersBase, 0);
hseigel@5093 3035 }
hseigel@5093 3036 }
hseigel@5093 3037 #endif
hseigel@5093 3038
jmasa@3947 3039 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 3040 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 3041 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 3042 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 3043 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 3044 // from there. This size calculated by -version.
jmasa@3947 3045 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
ehelin@5259 3046 (CompressedClassSpaceSize/BytesPerWord)*2);
jmasa@3947 3047 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 3048 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 3049 // of the boot class loader size.
jmasa@3947 3050 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 3051 // Initialize the list of virtual spaces.
coleenp@3602 3052 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 3053 }
coleenp@3602 3054 }
coleenp@3602 3055
hseigel@5093 3056 void Metaspace::initialize(Mutex* lock, MetaspaceType type) {
coleenp@3602 3057
coleenp@3602 3058 assert(space_list() != NULL,
coleenp@3602 3059 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 3060
hseigel@5093 3061 _vsm = new SpaceManager(NonClassType, lock, space_list());
coleenp@3602 3062 if (_vsm == NULL) {
coleenp@3602 3063 return;
coleenp@3602 3064 }
jmasa@3947 3065 size_t word_size;
jmasa@3947 3066 size_t class_word_size;
hseigel@5093 3067 vsm()->get_initial_chunk_sizes(type, &word_size, &class_word_size);
hseigel@5093 3068
hseigel@5093 3069 if (using_class_space()) {
hseigel@5093 3070 assert(class_space_list() != NULL,
hseigel@5093 3071 "Class VirtualSpaceList has not been initialized");
hseigel@5093 3072
hseigel@5093 3073 // Allocate SpaceManager for classes.
hseigel@5093 3074 _class_vsm = new SpaceManager(ClassType, lock, class_space_list());
hseigel@5093 3075 if (_class_vsm == NULL) {
hseigel@5093 3076 return;
hseigel@5093 3077 }
coleenp@3602 3078 }
coleenp@3602 3079
coleenp@3602 3080 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 3081
coleenp@3602 3082 // Allocate chunk for metadata objects
coleenp@3602 3083 Metachunk* new_chunk =
jmasa@3947 3084 space_list()->get_initialization_chunk(word_size,
jmasa@3947 3085 vsm()->medium_chunk_bunch());
coleenp@3602 3086 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 3087 if (new_chunk != NULL) {
coleenp@3602 3088 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 3089 vsm()->add_chunk(new_chunk, true);
coleenp@3602 3090 }
coleenp@3602 3091
coleenp@3602 3092 // Allocate chunk for class metadata objects
hseigel@5093 3093 if (using_class_space()) {
hseigel@5093 3094 Metachunk* class_chunk =
hseigel@5093 3095 class_space_list()->get_initialization_chunk(class_word_size,
hseigel@5093 3096 class_vsm()->medium_chunk_bunch());
hseigel@5093 3097 if (class_chunk != NULL) {
hseigel@5093 3098 class_vsm()->add_chunk(class_chunk, true);
hseigel@5093 3099 }
coleenp@3602 3100 }
iklam@4773 3101
iklam@4773 3102 _alloc_record_head = NULL;
iklam@4773 3103 _alloc_record_tail = NULL;
coleenp@3602 3104 }
coleenp@3602 3105
jmasa@3947 3106 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 3107 size_t byte_size = word_size * wordSize;