annotate src/share/vm/memory/metaspace.cpp @ 4877:71963b3f802a

8013590: NPG: Add a memory pool MXBean for Metaspace Reviewed-by: jmasa, mgerdin
author ehelin
date Wed, 26 Jun 2013 16:58:37 +0200
parents df7e1c0e3dc1
children cedf20e2a655
rev   line source
coleenp@3602 1 /*
coleenp@4277 2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
coleenp@3602 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@3602 4 *
coleenp@3602 5 * This code is free software; you can redistribute it and/or modify it
coleenp@3602 6 * under the terms of the GNU General Public License version 2 only, as
coleenp@3602 7 * published by the Free Software Foundation.
coleenp@3602 8 *
coleenp@3602 9 * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@3602 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@3602 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
coleenp@3602 12 * version 2 for more details (a copy is included in the LICENSE file that
coleenp@3602 13 * accompanied this code).
coleenp@3602 14 *
coleenp@3602 15 * You should have received a copy of the GNU General Public License version
coleenp@3602 16 * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@3602 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@3602 18 *
coleenp@3602 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@3602 20 * or visit www.oracle.com if you need additional information or have any
coleenp@3602 21 * questions.
coleenp@3602 22 *
coleenp@3602 23 */
coleenp@3602 24 #include "precompiled.hpp"
coleenp@3602 25 #include "gc_interface/collectedHeap.hpp"
coleenp@3602 26 #include "memory/binaryTreeDictionary.hpp"
jmasa@3761 27 #include "memory/freeList.hpp"
coleenp@3602 28 #include "memory/collectorPolicy.hpp"
coleenp@3602 29 #include "memory/filemap.hpp"
coleenp@3602 30 #include "memory/freeList.hpp"
jmasa@3761 31 #include "memory/metablock.hpp"
jmasa@3761 32 #include "memory/metachunk.hpp"
coleenp@3602 33 #include "memory/metaspace.hpp"
coleenp@3602 34 #include "memory/metaspaceShared.hpp"
coleenp@3602 35 #include "memory/resourceArea.hpp"
coleenp@3602 36 #include "memory/universe.hpp"
coleenp@3602 37 #include "runtime/globals.hpp"
coleenp@3602 38 #include "runtime/mutex.hpp"
coleenp@3860 39 #include "runtime/orderAccess.hpp"
coleenp@3602 40 #include "services/memTracker.hpp"
coleenp@3602 41 #include "utilities/copy.hpp"
coleenp@3602 42 #include "utilities/debug.hpp"
coleenp@3602 43
jmasa@3761 44 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
jmasa@3761 45 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
mgerdin@3829 46 // Define this macro to enable slow integrity checking of
mgerdin@3829 47 // the free chunk lists
mgerdin@3829 48 const bool metaspace_slow_verify = false;
mgerdin@3829 49
coleenp@3602 50 // Parameters for stress mode testing
coleenp@3602 51 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 52 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 53 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 54
coleenp@3602 55 MetaWord* last_allocated = 0;
coleenp@3602 56
coleenp@3602 57 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 58 enum ChunkIndex {
jmasa@3947 59 ZeroIndex = 0,
jmasa@3947 60 SpecializedIndex = ZeroIndex,
jmasa@3947 61 SmallIndex = SpecializedIndex + 1,
jmasa@3947 62 MediumIndex = SmallIndex + 1,
jmasa@3947 63 HumongousIndex = MediumIndex + 1,
jmasa@3947 64 NumberOfFreeLists = 3,
jmasa@3947 65 NumberOfInUseLists = 4
jmasa@3947 66 };
jmasa@3947 67
jmasa@3947 68 enum ChunkSizes { // in words.
jmasa@3947 69 ClassSpecializedChunk = 128,
jmasa@3947 70 SpecializedChunk = 128,
jmasa@3947 71 ClassSmallChunk = 256,
jmasa@3947 72 SmallChunk = 512,
jmasa@3947 73 ClassMediumChunk = 1 * K,
jmasa@3947 74 MediumChunk = 8 * K,
jmasa@3947 75 HumongousChunkGranularity = 8
coleenp@3602 76 };
coleenp@3602 77
coleenp@3602 78 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 79 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 80 return (ChunkIndex) (i+1);
coleenp@3602 81 }
coleenp@3602 82
coleenp@3602 83 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 84 // the default MetaspaceSize before argument processing was being
coleenp@3602 85 // used which was not the desired value. See the code
coleenp@3602 86 // in should_expand() to see how the initialization is handled
coleenp@3602 87 // now.
coleenp@3602 88 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 89 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 90 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 91 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 92
coleenp@3602 93 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 94 //
coleenp@3602 95 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 96 // allocated there is no explicit link between a Metachunk and
coleenp@3602 97 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 98 //
coleenp@3602 99 // Each SpaceManager maintains a
coleenp@3602 100 // list of the chunks it is using and the current chunk. The current
coleenp@3602 101 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 102 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 103 // reused from there.
coleenp@3602 104
jmasa@4497 105 typedef class FreeList<Metachunk> ChunkList;
coleenp@3602 106
coleenp@3602 107 // Manages the global free lists of chunks.
coleenp@3602 108 // Has three lists of free chunks, and a total size and
coleenp@3602 109 // count that includes all three
coleenp@3602 110
coleenp@3602 111 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 112
coleenp@3602 113 // Free list of chunks of different sizes.
jmasa@4572 114 // SpecializedChunk
coleenp@3602 115 // SmallChunk
coleenp@3602 116 // MediumChunk
coleenp@3602 117 // HumongousChunk
jmasa@3761 118 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 119
jmasa@3947 120
jmasa@3761 121 // HumongousChunk
jmasa@3761 122 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 123
coleenp@3602 124 // ChunkManager in all lists of this type
coleenp@3602 125 size_t _free_chunks_total;
coleenp@3602 126 size_t _free_chunks_count;
coleenp@3602 127
coleenp@3602 128 void dec_free_chunks_total(size_t v) {
coleenp@3602 129 assert(_free_chunks_count > 0 &&
coleenp@3602 130 _free_chunks_total > 0,
coleenp@3602 131 "About to go negative");
coleenp@3602 132 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 133 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 134 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 135 }
coleenp@3602 136
coleenp@3602 137 // Debug support
coleenp@3602 138
coleenp@3602 139 size_t sum_free_chunks();
coleenp@3602 140 size_t sum_free_chunks_count();
coleenp@3602 141
coleenp@3602 142 void locked_verify_free_chunks_total();
mgerdin@3829 143 void slow_locked_verify_free_chunks_total() {
mgerdin@3829 144 if (metaspace_slow_verify) {
mgerdin@3829 145 locked_verify_free_chunks_total();
mgerdin@3829 146 }
mgerdin@3829 147 }
coleenp@3602 148 void locked_verify_free_chunks_count();
mgerdin@3829 149 void slow_locked_verify_free_chunks_count() {
mgerdin@3829 150 if (metaspace_slow_verify) {
mgerdin@3829 151 locked_verify_free_chunks_count();
mgerdin@3829 152 }
mgerdin@3829 153 }
coleenp@3602 154 void verify_free_chunks_count();
coleenp@3602 155
coleenp@3602 156 public:
coleenp@3602 157
coleenp@3602 158 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 159
coleenp@3602 160 // add or delete (return) a chunk to the global freelist.
coleenp@3602 161 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 162 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 163
jmasa@3947 164 // Map a size to a list index assuming that there are lists
jmasa@3947 165 // for special, small, medium, and humongous chunks.
jmasa@3947 166 static ChunkIndex list_index(size_t size);
jmasa@3947 167
jmasa@4572 168 // Remove the chunk from its freelist. It is
jmasa@4572 169 // expected to be on one of the _free_chunks[] lists.
jmasa@4572 170 void remove_chunk(Metachunk* chunk);
jmasa@4572 171
jmasa@4497 172 // Add the simple linked list of chunks to the freelist of chunks
jmasa@4497 173 // of type index.
jmasa@4497 174 void return_chunks(ChunkIndex index, Metachunk* chunks);
jmasa@4497 175
coleenp@3602 176 // Total of the space in the free chunks list
coleenp@3602 177 size_t free_chunks_total();
coleenp@3602 178 size_t free_chunks_total_in_bytes();
coleenp@3602 179
coleenp@3602 180 // Number of chunks in the free chunks list
coleenp@3602 181 size_t free_chunks_count();
coleenp@3602 182
coleenp@3602 183 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 184 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 185 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 186 }
jmasa@3761 187 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 188 return &_humongous_dictionary;
jmasa@3761 189 }
coleenp@3602 190
coleenp@3602 191 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 192
coleenp@3602 193 // Returns the list for the given chunk word size.
coleenp@3602 194 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 195
coleenp@3602 196 // Add and remove from a list by size. Selects
coleenp@3602 197 // list based on size of chunk.
coleenp@3602 198 void free_chunks_put(Metachunk* chuck);
coleenp@3602 199 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 200
coleenp@3602 201 // Debug support
coleenp@3602 202 void verify();
mgerdin@3829 203 void slow_verify() {
mgerdin@3829 204 if (metaspace_slow_verify) {
mgerdin@3829 205 verify();
mgerdin@3829 206 }
mgerdin@3829 207 }
coleenp@3602 208 void locked_verify();
mgerdin@3829 209 void slow_locked_verify() {
mgerdin@3829 210 if (metaspace_slow_verify) {
mgerdin@3829 211 locked_verify();
mgerdin@3829 212 }
mgerdin@3829 213 }
coleenp@3602 214 void verify_free_chunks_total();
coleenp@3602 215
coleenp@3602 216 void locked_print_free_chunks(outputStream* st);
coleenp@3602 217 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 218
jmasa@3761 219 void print_on(outputStream* st);
coleenp@3602 220 };
coleenp@3602 221
coleenp@3602 222 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 223 // to the allocation of a quantum of metadata).
coleenp@3602 224 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 225 BlockTreeDictionary* _dictionary;
jmasa@3761 226 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 227
coleenp@3602 228 // Accessors
jmasa@3761 229 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 230
coleenp@3602 231 public:
coleenp@3602 232 BlockFreelist();
coleenp@3602 233 ~BlockFreelist();
coleenp@3602 234
coleenp@3602 235 // Get and return a block to the free list
jmasa@3761 236 MetaWord* get_block(size_t word_size);
jmasa@3761 237 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 238
jmasa@3761 239 size_t total_size() {
jmasa@3761 240 if (dictionary() == NULL) {
coleenp@3602 241 return 0;
jmasa@3761 242 } else {
jmasa@3761 243 return dictionary()->total_size();
coleenp@3602 244 }
jmasa@3761 245 }
coleenp@3602 246
coleenp@3602 247 void print_on(outputStream* st) const;
coleenp@3602 248 };
coleenp@3602 249
coleenp@3602 250 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 251 friend class VirtualSpaceList;
coleenp@3602 252
coleenp@3602 253 // Link to next VirtualSpaceNode
coleenp@3602 254 VirtualSpaceNode* _next;
coleenp@3602 255
coleenp@3602 256 // total in the VirtualSpace
coleenp@3602 257 MemRegion _reserved;
coleenp@3602 258 ReservedSpace _rs;
coleenp@3602 259 VirtualSpace _virtual_space;
coleenp@3602 260 MetaWord* _top;
jmasa@4572 261 // count of chunks contained in this VirtualSpace
jmasa@4572 262 uintx _container_count;
coleenp@3602 263
coleenp@3602 264 // Convenience functions for logical bottom and end
coleenp@3602 265 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 266 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 267
coleenp@3602 268 // Convenience functions to access the _virtual_space
coleenp@3602 269 char* low() const { return virtual_space()->low(); }
coleenp@3602 270 char* high() const { return virtual_space()->high(); }
coleenp@3602 271
jmasa@4572 272 // The first Metachunk will be allocated at the bottom of the
jmasa@4572 273 // VirtualSpace
jmasa@4572 274 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
jmasa@4572 275
jmasa@4572 276 void inc_container_count();
jmasa@4572 277 #ifdef ASSERT
jmasa@4572 278 uint container_count_slow();
jmasa@4572 279 #endif
jmasa@4572 280
coleenp@3602 281 public:
coleenp@3602 282
coleenp@3602 283 VirtualSpaceNode(size_t byte_size);
jmasa@4572 284 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
coleenp@3602 285 ~VirtualSpaceNode();
coleenp@3602 286
coleenp@3602 287 // address of next available space in _virtual_space;
coleenp@3602 288 // Accessors
coleenp@3602 289 VirtualSpaceNode* next() { return _next; }
coleenp@3602 290 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 291
coleenp@3602 292 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 293 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 294
coleenp@3602 295 // Accessors
coleenp@3602 296 MemRegion* reserved() { return &_reserved; }
coleenp@3602 297 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 298
jmasa@4580 299 // Returns true if "word_size" is available in the VirtualSpace
coleenp@3602 300 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 301
coleenp@3602 302 MetaWord* top() const { return _top; }
coleenp@3602 303 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 304
jmasa@4572 305 uintx container_count() { return _container_count; }
jmasa@4572 306 void dec_container_count();
jmasa@4572 307 #ifdef ASSERT
jmasa@4572 308 void verify_container_count();
jmasa@4572 309 #endif
jmasa@4572 310
coleenp@3602 311 // used and capacity in this single entry in the list
coleenp@3602 312 size_t used_words_in_vs() const;
coleenp@3602 313 size_t capacity_words_in_vs() const;
jmasa@4580 314 size_t free_words_in_vs() const;
coleenp@3602 315
coleenp@3602 316 bool initialize();
coleenp@3602 317
coleenp@3602 318 // get space from the virtual space
coleenp@3602 319 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 320
coleenp@3602 321 // Allocate a chunk from the virtual space and return it.
coleenp@3602 322 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 323 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 324
coleenp@3602 325 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 326 // to Virtualspace
coleenp@3602 327 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 328 bool shrink_by(size_t words);
coleenp@3602 329
jmasa@4572 330 // In preparation for deleting this node, remove all the chunks
jmasa@4572 331 // in the node from any freelist.
jmasa@4572 332 void purge(ChunkManager* chunk_manager);
jmasa@4572 333
coleenp@3869 334 #ifdef ASSERT
coleenp@3602 335 // Debug support
coleenp@3602 336 static void verify_virtual_space_total();
coleenp@3602 337 static void verify_virtual_space_count();
coleenp@3602 338 void mangle();
coleenp@3869 339 #endif
coleenp@3602 340
coleenp@3602 341 void print_on(outputStream* st) const;
coleenp@3602 342 };
coleenp@3602 343
coleenp@3602 344 // byte_size is the size of the associated virtualspace.
jmasa@4572 345 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0), _container_count(0) {
zgu@4317 346 // align up to vm allocation granularity
zgu@4317 347 byte_size = align_size_up(byte_size, os::vm_allocation_granularity());
zgu@4317 348
coleenp@4369 349 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
coleenp@4369 350 // configurable address, generally at the top of the Java heap so other
coleenp@4369 351 // memory addresses don't conflict.
coleenp@3602 352 if (DumpSharedSpaces) {
coleenp@4369 353 char* shared_base = (char*)SharedBaseAddress;
coleenp@3602 354 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 355 if (_rs.is_reserved()) {
coleenp@4369 356 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
coleenp@3602 357 } else {
coleenp@4369 358 // Get a mmap region anywhere if the SharedBaseAddress fails.
coleenp@3602 359 _rs = ReservedSpace(byte_size);
coleenp@3602 360 }
coleenp@3602 361 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 362 } else {
coleenp@3602 363 _rs = ReservedSpace(byte_size);
coleenp@3602 364 }
coleenp@3602 365
coleenp@3602 366 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 367 }
coleenp@3602 368
jmasa@4572 369 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
jmasa@4572 370 Metachunk* chunk = first_chunk();
jmasa@4572 371 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 372 while (chunk < invalid_chunk ) {
jmasa@4572 373 assert(chunk->is_free(), "Should be marked free");
jmasa@4572 374 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 375 chunk_manager->remove_chunk(chunk);
jmasa@4572 376 assert(chunk->next() == NULL &&
jmasa@4572 377 chunk->prev() == NULL,
jmasa@4572 378 "Was not removed from its list");
jmasa@4572 379 chunk = (Metachunk*) next;
jmasa@4572 380 }
jmasa@4572 381 }
jmasa@4572 382
jmasa@4572 383 #ifdef ASSERT
jmasa@4572 384 uint VirtualSpaceNode::container_count_slow() {
jmasa@4572 385 uint count = 0;
jmasa@4572 386 Metachunk* chunk = first_chunk();
jmasa@4572 387 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 388 while (chunk < invalid_chunk ) {
jmasa@4572 389 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 390 // Don't count the chunks on the free lists. Those are
jmasa@4572 391 // still part of the VirtualSpaceNode but not currently
jmasa@4572 392 // counted.
jmasa@4572 393 if (!chunk->is_free()) {
jmasa@4572 394 count++;
jmasa@4572 395 }
jmasa@4572 396 chunk = (Metachunk*) next;
jmasa@4572 397 }
jmasa@4572 398 return count;
jmasa@4572 399 }
jmasa@4572 400 #endif
jmasa@4572 401
coleenp@3602 402 // List of VirtualSpaces for metadata allocation.
coleenp@3602 403 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 404 // for total space in the VirtualSpace.
coleenp@3602 405 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 406 friend class VirtualSpaceNode;
coleenp@3602 407
coleenp@3602 408 enum VirtualSpaceSizes {
coleenp@3602 409 VirtualSpaceSize = 256 * K
coleenp@3602 410 };
coleenp@3602 411
coleenp@3602 412 // Global list of virtual spaces
coleenp@3602 413 // Head of the list
coleenp@3602 414 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 415 // virtual space currently being used for allocations
coleenp@3602 416 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 417 // Free chunk list for all other metadata
coleenp@3602 418 ChunkManager _chunk_manager;
coleenp@3602 419
coleenp@3602 420 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 421 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 422 bool _is_class;
coleenp@3602 423 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 424
coleenp@3602 425 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 426 size_t _virtual_space_total;
coleenp@3602 427 size_t _virtual_space_count;
coleenp@3602 428
coleenp@3602 429 ~VirtualSpaceList();
coleenp@3602 430
coleenp@3602 431 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 432
coleenp@3602 433 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 434 _virtual_space_list = v;
coleenp@3602 435 }
coleenp@3602 436 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 437 _current_virtual_space = v;
coleenp@3602 438 }
coleenp@3602 439
coleenp@3602 440 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 441
coleenp@3602 442 // Get another virtual space and add it to the list. This
coleenp@3602 443 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 444 // and is typically followed by the allocation of a chunk.
coleenp@3602 445 bool grow_vs(size_t vs_word_size);
coleenp@3602 446
coleenp@3602 447 public:
coleenp@3602 448 VirtualSpaceList(size_t word_size);
coleenp@3602 449 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 450
jmasa@4580 451 size_t free_bytes();
jmasa@4580 452
jmasa@3947 453 Metachunk* get_new_chunk(size_t word_size,
jmasa@3947 454 size_t grow_chunks_by_words,
jmasa@3947 455 size_t medium_chunk_bunch);
jmasa@3947 456
jmasa@3947 457 // Get the first chunk for a Metaspace. Used for
jmasa@3947 458 // special cases such as the boot class loader, reflection
jmasa@3947 459 // class loader and anonymous class loader.
jmasa@3947 460 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch);
coleenp@3602 461
coleenp@3602 462 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 463 return _current_virtual_space;
coleenp@3602 464 }
coleenp@3602 465
coleenp@3602 466 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 467 bool is_class() const { return _is_class; }
coleenp@3602 468
coleenp@3602 469 // Allocate the first virtualspace.
coleenp@3602 470 void initialize(size_t word_size);
coleenp@3602 471
coleenp@3602 472 size_t virtual_space_total() { return _virtual_space_total; }
jmasa@4572 473
jmasa@4572 474 void inc_virtual_space_total(size_t v);
jmasa@4572 475 void dec_virtual_space_total(size_t v);
jmasa@4572 476 void inc_virtual_space_count();
jmasa@4572 477 void dec_virtual_space_count();
jmasa@4572 478
jmasa@4572 479 // Unlink empty VirtualSpaceNodes and free it.
jmasa@4572 480 void purge();
coleenp@3602 481
coleenp@3602 482 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 483 // These are global values shared by all Metaspaces
coleenp@3602 484 size_t capacity_words_sum();
coleenp@3602 485 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 486 size_t used_words_sum();
coleenp@3602 487 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 488
coleenp@3602 489 bool contains(const void *ptr);
coleenp@3602 490
coleenp@3602 491 void print_on(outputStream* st) const;
coleenp@3602 492
coleenp@3602 493 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 494 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 495 public:
coleenp@3602 496 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 497 _virtual_spaces(virtual_spaces) {}
coleenp@3602 498
coleenp@3602 499 bool repeat() {
coleenp@3602 500 return _virtual_spaces != NULL;
coleenp@3602 501 }
coleenp@3602 502
coleenp@3602 503 VirtualSpaceNode* get_next() {
coleenp@3602 504 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 505 if (_virtual_spaces != NULL) {
coleenp@3602 506 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 507 }
coleenp@3602 508 return result;
coleenp@3602 509 }
coleenp@3602 510 };
coleenp@3602 511 };
coleenp@3602 512
coleenp@3602 513 class Metadebug : AllStatic {
coleenp@3602 514 // Debugging support for Metaspaces
coleenp@3602 515 static int _deallocate_block_a_lot_count;
coleenp@3602 516 static int _deallocate_chunk_a_lot_count;
coleenp@3602 517 static int _allocation_fail_alot_count;
coleenp@3602 518
coleenp@3602 519 public:
coleenp@3602 520 static int deallocate_block_a_lot_count() {
coleenp@3602 521 return _deallocate_block_a_lot_count;
coleenp@3602 522 }
coleenp@3602 523 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 524 _deallocate_block_a_lot_count = v;
coleenp@3602 525 }
coleenp@3602 526 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 527 _deallocate_block_a_lot_count++;
coleenp@3602 528 }
coleenp@3602 529 static int deallocate_chunk_a_lot_count() {
coleenp@3602 530 return _deallocate_chunk_a_lot_count;
coleenp@3602 531 }
coleenp@3602 532 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 533 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 534 }
coleenp@3602 535 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 536 _deallocate_chunk_a_lot_count++;
coleenp@3602 537 }
coleenp@3602 538
coleenp@3602 539 static void init_allocation_fail_alot_count();
coleenp@3602 540 #ifdef ASSERT
coleenp@3602 541 static bool test_metadata_failure();
coleenp@3602 542 #endif
coleenp@3602 543
coleenp@3602 544 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 545 size_t chunk_word_size);
coleenp@3602 546 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 547 size_t chunk_word_size);
coleenp@3602 548
coleenp@3602 549 };
coleenp@3602 550
coleenp@3602 551 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 552 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 553 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 554
coleenp@3602 555 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 556 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 557 friend class Metaspace;
coleenp@3602 558 friend class Metadebug;
coleenp@3602 559
coleenp@3602 560 private:
jmasa@3947 561
coleenp@3602 562 // protects allocations and contains.
coleenp@3602 563 Mutex* const _lock;
coleenp@3602 564
jmasa@4727 565 // Type of metadata allocated.
jmasa@4727 566 Metaspace::MetadataType _mdtype;
jmasa@4727 567
jmasa@3947 568 // Chunk related size
jmasa@3947 569 size_t _medium_chunk_bunch;
jmasa@3947 570
coleenp@3602 571 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 572 // are done from the current chunk. The list is used for deallocating
coleenp@3602 573 // chunks when the SpaceManager is freed.
jmasa@3761 574 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 575 Metachunk* _current_chunk;
coleenp@3602 576
coleenp@3602 577 // Virtual space where allocation comes from.
coleenp@3602 578 VirtualSpaceList* _vs_list;
coleenp@3602 579
coleenp@3602 580 // Number of small chunks to allocate to a manager
coleenp@3602 581 // If class space manager, small chunks are unlimited
coleenp@3602 582 static uint const _small_chunk_limit;
coleenp@3602 583 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 584
coleenp@3602 585 // Sum of all space in allocated chunks
jmasa@4580 586 size_t _allocated_blocks_words;
jmasa@4580 587
jmasa@4580 588 // Sum of all allocated chunks
jmasa@4580 589 size_t _allocated_chunks_words;
jmasa@4580 590 size_t _allocated_chunks_count;
coleenp@3602 591
coleenp@3602 592 // Free lists of blocks are per SpaceManager since they
coleenp@3602 593 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 594 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 595 // the class loader using the SpaceManager is collected.
coleenp@3602 596 BlockFreelist _block_freelists;
coleenp@3602 597
coleenp@3602 598 // protects virtualspace and chunk expansions
coleenp@3602 599 static const char* _expand_lock_name;
coleenp@3602 600 static const int _expand_lock_rank;
coleenp@3602 601 static Mutex* const _expand_lock;
coleenp@3602 602
jmasa@3947 603 private:
coleenp@3602 604 // Accessors
coleenp@3602 605 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 606 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 607
coleenp@3602 608 BlockFreelist* block_freelists() const {
coleenp@3602 609 return (BlockFreelist*) &_block_freelists;
coleenp@3602 610 }
coleenp@3602 611
jmasa@4727 612 Metaspace::MetadataType mdtype() { return _mdtype; }
coleenp@3602 613 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 614
coleenp@3602 615 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 616 void set_current_chunk(Metachunk* v) {
coleenp@3602 617 _current_chunk = v;
coleenp@3602 618 }
coleenp@3602 619
coleenp@3602 620 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 621
coleenp@3602 622 // Add chunk to the list of chunks in use
coleenp@3602 623 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 624
coleenp@3602 625 Mutex* lock() const { return _lock; }
coleenp@3602 626
jmasa@3947 627 const char* chunk_size_name(ChunkIndex index) const;
jmasa@3947 628
jmasa@3947 629 protected:
jmasa@3947 630 void initialize();
jmasa@3947 631
coleenp@3602 632 public:
jmasa@4727 633 SpaceManager(Metaspace::MetadataType mdtype,
jmasa@4727 634 Mutex* lock,
jmasa@3947 635 VirtualSpaceList* vs_list);
coleenp@3602 636 ~SpaceManager();
coleenp@3602 637
jmasa@3947 638 enum ChunkMultiples {
jmasa@3947 639 MediumChunkMultiple = 4
coleenp@3602 640 };
coleenp@3602 641
coleenp@3602 642 // Accessors
jmasa@3947 643 size_t specialized_chunk_size() { return SpecializedChunk; }
jmasa@3947 644 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; }
jmasa@3947 645 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; }
jmasa@3947 646 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
jmasa@3947 647
jmasa@4580 648 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
jmasa@4580 649 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
jmasa@4580 650 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
jmasa@4580 651 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
jmasa@4580 652
jmasa@3947 653 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@3602 654
coleenp@3602 655 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 656
jmasa@4580 657 // Increment the per Metaspace and global running sums for Metachunks
jmasa@4580 658 // by the given size. This is used when a Metachunk to added to
jmasa@4580 659 // the in-use list.
jmasa@4580 660 void inc_size_metrics(size_t words);
jmasa@4580 661 // Increment the per Metaspace and global running sums Metablocks by the given
jmasa@4580 662 // size. This is used when a Metablock is allocated.
jmasa@4580 663 void inc_used_metrics(size_t words);
jmasa@4580 664 // Delete the portion of the running sums for this SpaceManager. That is,
jmasa@4580 665 // the globals running sums for the Metachunks and Metablocks are
jmasa@4580 666 // decremented for all the Metachunks in-use by this SpaceManager.
jmasa@4580 667 void dec_total_from_size_metrics();
jmasa@4580 668
jmasa@3947 669 // Set the sizes for the initial chunks.
jmasa@3947 670 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 671 size_t* chunk_word_size,
jmasa@3947 672 size_t* class_chunk_word_size);
jmasa@3947 673
coleenp@3602 674 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 675 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 676 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 677 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 678 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 679
coleenp@3602 680 size_t sum_count_in_chunks_in_use();
coleenp@3602 681 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 682
jmasa@3947 683 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@3947 684
coleenp@3602 685 // Block allocation and deallocation.
coleenp@3602 686 // Allocates a block from the current chunk
coleenp@3602 687 MetaWord* allocate(size_t word_size);
coleenp@3602 688
coleenp@3602 689 // Helper for allocations
jmasa@3761 690 MetaWord* allocate_work(size_t word_size);
coleenp@3602 691
coleenp@3602 692 // Returns a block to the per manager freelist
jmasa@3761 693 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 694
coleenp@3602 695 // Based on the allocation size and a minimum chunk size,
coleenp@3602 696 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 697 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 698
coleenp@3602 699 // Called when an allocation from the current chunk fails.
coleenp@3602 700 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 701 // and allocates from that chunk.
jmasa@3761 702 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 703
coleenp@3602 704 // debugging support.
coleenp@3602 705
coleenp@3602 706 void dump(outputStream* const out) const;
coleenp@3602 707 void print_on(outputStream* st) const;
coleenp@3602 708 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 709
coleenp@3602 710 void verify();
jmasa@3892 711 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 712 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 713 #ifdef ASSERT
jmasa@4580 714 void verify_allocated_blocks_words();
coleenp@3602 715 #endif
iklam@4773 716
iklam@4773 717 size_t get_raw_word_size(size_t word_size) {
iklam@4773 718 // If only the dictionary is going to be used (i.e., no
iklam@4773 719 // indexed free list), then there is a minimum size requirement.
iklam@4773 720 // MinChunkSize is a placeholder for the real minimum size JJJ
iklam@4773 721 size_t byte_size = word_size * BytesPerWord;
iklam@4773 722
iklam@4773 723 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
iklam@4773 724
iklam@4773 725 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
iklam@4773 726 Metablock::min_block_byte_size());
iklam@4773 727 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
iklam@4773 728 size_t raw_word_size = raw_bytes_size / BytesPerWord;
iklam@4773 729 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
iklam@4773 730
iklam@4773 731 return raw_word_size;
iklam@4773 732 }
coleenp@3602 733 };
coleenp@3602 734
coleenp@3602 735 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 736
coleenp@3602 737 const char* SpaceManager::_expand_lock_name =
coleenp@3602 738 "SpaceManager chunk allocation lock";
coleenp@3602 739 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 740 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 741 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 742 SpaceManager::_expand_lock_name,
coleenp@3602 743 Mutex::_allow_vm_block_flag);
coleenp@3602 744
jmasa@4572 745 void VirtualSpaceNode::inc_container_count() {
jmasa@4572 746 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 747 _container_count++;
jmasa@4572 748 assert(_container_count == container_count_slow(),
jmasa@4572 749 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 750 "container_count_slow() " SIZE_FORMAT,
jmasa@4572 751 _container_count, container_count_slow()));
jmasa@4572 752 }
jmasa@4572 753
jmasa@4572 754 void VirtualSpaceNode::dec_container_count() {
jmasa@4572 755 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 756 _container_count--;
jmasa@4572 757 }
jmasa@4572 758
jmasa@4572 759 #ifdef ASSERT
jmasa@4572 760 void VirtualSpaceNode::verify_container_count() {
jmasa@4572 761 assert(_container_count == container_count_slow(),
jmasa@4572 762 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 763 "container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
jmasa@4572 764 }
jmasa@4572 765 #endif
jmasa@4572 766
coleenp@3602 767 // BlockFreelist methods
coleenp@3602 768
coleenp@3602 769 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 770
coleenp@3602 771 BlockFreelist::~BlockFreelist() {
coleenp@3602 772 if (_dictionary != NULL) {
coleenp@3602 773 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 774 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 775 }
coleenp@3602 776 delete _dictionary;
coleenp@3602 777 }
coleenp@3602 778 }
coleenp@3602 779
jmasa@3761 780 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 781 Metablock* block = (Metablock*) p;
jmasa@3761 782 block->set_word_size(word_size);
jmasa@3761 783 block->set_prev(NULL);
jmasa@3761 784 block->set_next(NULL);
jmasa@3761 785
coleenp@3602 786 return block;
coleenp@3602 787 }
coleenp@3602 788
jmasa@3761 789 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 790 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 791 if (dictionary() == NULL) {
jmasa@3761 792 _dictionary = new BlockTreeDictionary();
coleenp@3602 793 }
jmasa@3761 794 dictionary()->return_chunk(free_chunk);
coleenp@3602 795 }
coleenp@3602 796
jmasa@3761 797 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 798 if (dictionary() == NULL) {
coleenp@3602 799 return NULL;
coleenp@3602 800 }
coleenp@3602 801
jmasa@3761 802 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 803 // Dark matter. Too small for dictionary.
coleenp@3602 804 return NULL;
coleenp@3602 805 }
jmasa@3761 806
jmasa@3761 807 Metablock* free_block =
jmasa@3761 808 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 809 if (free_block == NULL) {
jmasa@3761 810 return NULL;
jmasa@3761 811 }
jmasa@3761 812
jmasa@3761 813 return (MetaWord*) free_block;
coleenp@3602 814 }
coleenp@3602 815
coleenp@3602 816 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 817 if (dictionary() == NULL) {
coleenp@3602 818 return;
coleenp@3602 819 }
coleenp@3602 820 dictionary()->print_free_lists(st);
coleenp@3602 821 }
coleenp@3602 822
coleenp@3602 823 // VirtualSpaceNode methods
coleenp@3602 824
coleenp@3602 825 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 826 _rs.release();
jmasa@4572 827 #ifdef ASSERT
jmasa@4572 828 size_t word_size = sizeof(*this) / BytesPerWord;
jmasa@4572 829 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
jmasa@4572 830 #endif
coleenp@3602 831 }
coleenp@3602 832
coleenp@3602 833 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 834 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 835 }
coleenp@3602 836
coleenp@3602 837 // Space committed in the VirtualSpace
coleenp@3602 838 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 839 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 840 }
coleenp@3602 841
jmasa@4580 842 size_t VirtualSpaceNode::free_words_in_vs() const {
jmasa@4580 843 return pointer_delta(end(), top(), sizeof(MetaWord));
jmasa@4580 844 }
coleenp@3602 845
coleenp@3602 846 // Allocates the chunk from the virtual space only.
coleenp@3602 847 // This interface is also used internally for debugging. Not all
coleenp@3602 848 // chunks removed here are necessarily used for allocation.
coleenp@3602 849 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 850 // Bottom of the new chunk
coleenp@3602 851 MetaWord* chunk_limit = top();
coleenp@3602 852 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 853
coleenp@3602 854 if (!is_available(chunk_word_size)) {
coleenp@3602 855 if (TraceMetadataChunkAllocation) {
coleenp@3602 856 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 857 // Dump some information about the virtual space that is nearly full
coleenp@3602 858 print_on(tty);
coleenp@3602 859 }
coleenp@3602 860 return NULL;
coleenp@3602 861 }
coleenp@3602 862
coleenp@3602 863 // Take the space (bump top on the current virtual space).
coleenp@3602 864 inc_top(chunk_word_size);
coleenp@3602 865
jmasa@4572 866 // Initialize the chunk
jmasa@4572 867 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
coleenp@3602 868 return result;
coleenp@3602 869 }
coleenp@3602 870
coleenp@3602 871
coleenp@3602 872 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 873 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 874 size_t bytes = words * BytesPerWord;
coleenp@3602 875 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 876 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 877 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 878 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 879 virtual_space()->print();
coleenp@3602 880 }
coleenp@3602 881 return result;
coleenp@3602 882 }
coleenp@3602 883
coleenp@3602 884 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 885 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 886 size_t bytes = words * BytesPerWord;
coleenp@3602 887 virtual_space()->shrink_by(bytes);
coleenp@3602 888 return true;
coleenp@3602 889 }
coleenp@3602 890
coleenp@3602 891 // Add another chunk to the chunk list.
coleenp@3602 892
coleenp@3602 893 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 894 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 895 Metachunk* result = take_from_committed(chunk_word_size);
jmasa@4572 896 if (result != NULL) {
jmasa@4572 897 inc_container_count();
jmasa@4572 898 }
jmasa@4572 899 return result;
coleenp@3602 900 }
coleenp@3602 901
coleenp@3602 902 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 903 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 904
coleenp@3602 905 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 906
coleenp@3602 907 if (new_chunk == NULL) {
coleenp@3602 908 // Only a small part of the virtualspace is committed when first
coleenp@3602 909 // allocated so committing more here can be expected.
coleenp@3602 910 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 911 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 912 page_size_words);
coleenp@3602 913 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 914 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 915 }
coleenp@3602 916 return new_chunk;
coleenp@3602 917 }
coleenp@3602 918
coleenp@3602 919 bool VirtualSpaceNode::initialize() {
coleenp@3602 920
coleenp@3602 921 if (!_rs.is_reserved()) {
coleenp@3602 922 return false;
coleenp@3602 923 }
coleenp@3602 924
jmasa@3947 925 // An allocation out of this Virtualspace that is larger
jmasa@3947 926 // than an initial commit size can waste that initial committed
jmasa@3947 927 // space.
jmasa@3947 928 size_t committed_byte_size = 0;
coleenp@3602 929 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 930 if (result) {
coleenp@3602 931 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 932 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 933 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 934
coleenp@3603 935 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 936 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 937 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 938 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 939 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 940 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 941 _rs.size() / BytesPerWord));
coleenp@3602 942 }
coleenp@3602 943
coleenp@3602 944 return result;
coleenp@3602 945 }
coleenp@3602 946
coleenp@3602 947 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 948 size_t used = used_words_in_vs();
coleenp@3602 949 size_t capacity = capacity_words_in_vs();
coleenp@3602 950 VirtualSpace* vs = virtual_space();
coleenp@3602 951 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 952 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 953 PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@3947 954 vs, capacity / K,
jmasa@3947 955 capacity == 0 ? 0 : used * 100 / capacity,
coleenp@3602 956 bottom(), top(), end(),
coleenp@3602 957 vs->high_boundary());
coleenp@3602 958 }
coleenp@3602 959
coleenp@3869 960 #ifdef ASSERT
coleenp@3602 961 void VirtualSpaceNode::mangle() {
coleenp@3602 962 size_t word_size = capacity_words_in_vs();
coleenp@3602 963 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 964 }
coleenp@3869 965 #endif // ASSERT
coleenp@3602 966
coleenp@3602 967 // VirtualSpaceList methods
coleenp@3602 968 // Space allocated from the VirtualSpace
coleenp@3602 969
coleenp@3602 970 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 971 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 972 while (iter.repeat()) {
coleenp@3602 973 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 974 delete vsl;
coleenp@3602 975 }
coleenp@3602 976 }
coleenp@3602 977
jmasa@4572 978 void VirtualSpaceList::inc_virtual_space_total(size_t v) {
jmasa@4572 979 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 980 _virtual_space_total = _virtual_space_total + v;
jmasa@4572 981 }
jmasa@4572 982 void VirtualSpaceList::dec_virtual_space_total(size_t v) {
jmasa@4572 983 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 984 _virtual_space_total = _virtual_space_total - v;
jmasa@4572 985 }
jmasa@4572 986
jmasa@4572 987 void VirtualSpaceList::inc_virtual_space_count() {
jmasa@4572 988 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 989 _virtual_space_count++;
jmasa@4572 990 }
jmasa@4572 991 void VirtualSpaceList::dec_virtual_space_count() {
jmasa@4572 992 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 993 _virtual_space_count--;
jmasa@4572 994 }
jmasa@4572 995
jmasa@4572 996 void ChunkManager::remove_chunk(Metachunk* chunk) {
jmasa@4572 997 size_t word_size = chunk->word_size();
jmasa@4572 998 ChunkIndex index = list_index(word_size);
jmasa@4572 999 if (index != HumongousIndex) {
jmasa@4572 1000 free_chunks(index)->remove_chunk(chunk);
jmasa@4572 1001 } else {
jmasa@4572 1002 humongous_dictionary()->remove_chunk(chunk);
jmasa@4572 1003 }
jmasa@4572 1004
jmasa@4572 1005 // Chunk is being removed from the chunks free list.
jmasa@4572 1006 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@4572 1007 }
jmasa@4572 1008
jmasa@4572 1009 // Walk the list of VirtualSpaceNodes and delete
jmasa@4572 1010 // nodes with a 0 container_count. Remove Metachunks in
jmasa@4572 1011 // the node from their respective freelists.
jmasa@4572 1012 void VirtualSpaceList::purge() {
jmasa@4572 1013 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 1014 // Don't use a VirtualSpaceListIterator because this
jmasa@4572 1015 // list is being changed and a straightforward use of an iterator is not safe.
jmasa@4572 1016 VirtualSpaceNode* purged_vsl = NULL;
jmasa@4572 1017 VirtualSpaceNode* prev_vsl = virtual_space_list();
jmasa@4572 1018 VirtualSpaceNode* next_vsl = prev_vsl;
jmasa@4572 1019 while (next_vsl != NULL) {
jmasa@4572 1020 VirtualSpaceNode* vsl = next_vsl;
jmasa@4572 1021 next_vsl = vsl->next();
jmasa@4572 1022 // Don't free the current virtual space since it will likely
jmasa@4572 1023 // be needed soon.
jmasa@4572 1024 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
jmasa@4572 1025 // Unlink it from the list
jmasa@4572 1026 if (prev_vsl == vsl) {
jmasa@4572 1027 // This is the case of the current note being the first note.
jmasa@4572 1028 assert(vsl == virtual_space_list(), "Expected to be the first note");
jmasa@4572 1029 set_virtual_space_list(vsl->next());
jmasa@4572 1030 } else {
jmasa@4572 1031 prev_vsl->set_next(vsl->next());
jmasa@4572 1032 }
jmasa@4572 1033
jmasa@4572 1034 vsl->purge(chunk_manager());
jmasa@4572 1035 dec_virtual_space_total(vsl->reserved()->word_size());
jmasa@4572 1036 dec_virtual_space_count();
jmasa@4572 1037 purged_vsl = vsl;
jmasa@4572 1038 delete vsl;
jmasa@4572 1039 } else {
jmasa@4572 1040 prev_vsl = vsl;
jmasa@4572 1041 }
jmasa@4572 1042 }
jmasa@4572 1043 #ifdef ASSERT
jmasa@4572 1044 if (purged_vsl != NULL) {
jmasa@4572 1045 // List should be stable enough to use an iterator here.
jmasa@4572 1046 VirtualSpaceListIterator iter(virtual_space_list());
jmasa@4572 1047 while (iter.repeat()) {
jmasa@4572 1048 VirtualSpaceNode* vsl = iter.get_next();
jmasa@4572 1049 assert(vsl != purged_vsl, "Purge of vsl failed");
jmasa@4572 1050 }
jmasa@4572 1051 }
jmasa@4572 1052 #endif
jmasa@4572 1053 }
jmasa@4572 1054
coleenp@3602 1055 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 1056 size_t allocated_by_vs = 0;
coleenp@3602 1057 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1058 while (iter.repeat()) {
coleenp@3602 1059 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1060 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 1061 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 1062 }
coleenp@3602 1063 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 1064 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 1065 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 1066 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 1067 size_t used =
coleenp@3602 1068 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 1069 return used;
coleenp@3602 1070 }
coleenp@3602 1071
coleenp@3602 1072 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 1073 // for metadata. This is the upper limit on the capacity
coleenp@3602 1074 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 1075 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 1076 size_t capacity = 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 capacity += vsl->capacity_words_in_vs();
coleenp@3602 1081 }
coleenp@3602 1082 return capacity;
coleenp@3602 1083 }
coleenp@3602 1084
coleenp@3602 1085 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 1086 _is_class(false),
coleenp@3602 1087 _virtual_space_list(NULL),
coleenp@3602 1088 _current_virtual_space(NULL),
coleenp@3602 1089 _virtual_space_total(0),
coleenp@3602 1090 _virtual_space_count(0) {
coleenp@3602 1091 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1092 Mutex::_no_safepoint_check_flag);
coleenp@3602 1093 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 1094
jmasa@4497 1095 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1096 _chunk_manager.free_chunks(SmallIndex)->set_size(SmallChunk);
jmasa@4497 1097 _chunk_manager.free_chunks(MediumIndex)->set_size(MediumChunk);
coleenp@3602 1098 assert(initialization_succeeded,
coleenp@3602 1099 " VirtualSpaceList initialization should not fail");
coleenp@3602 1100 }
coleenp@3602 1101
coleenp@3602 1102 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 1103 _is_class(true),
coleenp@3602 1104 _virtual_space_list(NULL),
coleenp@3602 1105 _current_virtual_space(NULL),
coleenp@3602 1106 _virtual_space_total(0),
coleenp@3602 1107 _virtual_space_count(0) {
coleenp@3602 1108 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1109 Mutex::_no_safepoint_check_flag);
coleenp@3602 1110 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 1111 bool succeeded = class_entry->initialize();
jmasa@4497 1112 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1113 _chunk_manager.free_chunks(SmallIndex)->set_size(ClassSmallChunk);
jmasa@4497 1114 _chunk_manager.free_chunks(MediumIndex)->set_size(ClassMediumChunk);
coleenp@3602 1115 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 1116 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 1117 }
coleenp@3602 1118
jmasa@4580 1119 size_t VirtualSpaceList::free_bytes() {
jmasa@4580 1120 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
jmasa@4580 1121 }
jmasa@4580 1122
coleenp@3602 1123 // Allocate another meta virtual space and add it to the list.
coleenp@3602 1124 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 1125 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1126 if (vs_word_size == 0) {
coleenp@3602 1127 return false;
coleenp@3602 1128 }
coleenp@3602 1129 // Reserve the space
coleenp@3602 1130 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 1131 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 1132
coleenp@3602 1133 // Allocate the meta virtual space and initialize it.
coleenp@3602 1134 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 1135 if (!new_entry->initialize()) {
coleenp@3602 1136 delete new_entry;
coleenp@3602 1137 return false;
coleenp@3602 1138 } else {
coleenp@3860 1139 // ensure lock-free iteration sees fully initialized node
coleenp@3860 1140 OrderAccess::storestore();
coleenp@3602 1141 link_vs(new_entry, vs_word_size);
coleenp@3602 1142 return true;
coleenp@3602 1143 }
coleenp@3602 1144 }
coleenp@3602 1145
coleenp@3602 1146 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 1147 if (virtual_space_list() == NULL) {
coleenp@3602 1148 set_virtual_space_list(new_entry);
coleenp@3602 1149 } else {
coleenp@3602 1150 current_virtual_space()->set_next(new_entry);
coleenp@3602 1151 }
coleenp@3602 1152 set_current_virtual_space(new_entry);
coleenp@3602 1153 inc_virtual_space_total(vs_word_size);
coleenp@3602 1154 inc_virtual_space_count();
coleenp@3602 1155 #ifdef ASSERT
coleenp@3602 1156 new_entry->mangle();
coleenp@3602 1157 #endif
coleenp@3602 1158 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 1159 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 1160 vsl->print_on(tty);
coleenp@3602 1161 }
coleenp@3602 1162 }
coleenp@3602 1163
coleenp@3602 1164 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@3947 1165 size_t grow_chunks_by_words,
jmasa@3947 1166 size_t medium_chunk_bunch) {
coleenp@3602 1167
coleenp@3602 1168 // Get a chunk from the chunk freelist
coleenp@3602 1169 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 1170
jmasa@4572 1171 if (next != NULL) {
jmasa@4572 1172 next->container()->inc_container_count();
jmasa@4572 1173 } else {
jmasa@4572 1174 // Allocate a chunk out of the current virtual space.
coleenp@3602 1175 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1176 }
coleenp@3602 1177
coleenp@3602 1178 if (next == NULL) {
coleenp@3602 1179 // Not enough room in current virtual space. Try to commit
coleenp@3602 1180 // more space.
jmasa@3947 1181 size_t expand_vs_by_words = MAX2(medium_chunk_bunch,
jmasa@3947 1182 grow_chunks_by_words);
coleenp@3602 1183 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1184 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 1185 page_size_words);
coleenp@3602 1186 bool vs_expanded =
coleenp@3602 1187 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 1188 if (!vs_expanded) {
coleenp@3602 1189 // Should the capacity of the metaspaces be expanded for
coleenp@3602 1190 // this allocation? If it's the virtual space for classes and is
coleenp@3602 1191 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 1192 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 1193 // Get another virtual space.
coleenp@3602 1194 size_t grow_vs_words =
coleenp@3602 1195 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 1196 if (grow_vs(grow_vs_words)) {
coleenp@3602 1197 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 1198 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 1199 }
coleenp@3602 1200 } else {
coleenp@3602 1201 // Allocation will fail and induce a GC
coleenp@3602 1202 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1203 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 1204 " Fail instead of expand the metaspace");
coleenp@3602 1205 }
coleenp@3602 1206 }
coleenp@3602 1207 } else {
coleenp@3602 1208 // The virtual space expanded, get a new chunk
coleenp@3602 1209 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1210 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 1211 }
coleenp@3602 1212 }
coleenp@3602 1213
jmasa@3947 1214 assert(next == NULL || (next->next() == NULL && next->prev() == NULL),
jmasa@3947 1215 "New chunk is still on some list");
coleenp@3602 1216 return next;
coleenp@3602 1217 }
coleenp@3602 1218
jmasa@3947 1219 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size,
jmasa@3947 1220 size_t chunk_bunch) {
jmasa@3947 1221 // Get a chunk from the chunk freelist
jmasa@3947 1222 Metachunk* new_chunk = get_new_chunk(chunk_word_size,
jmasa@3947 1223 chunk_word_size,
jmasa@3947 1224 chunk_bunch);
jmasa@3947 1225 return new_chunk;
jmasa@3947 1226 }
jmasa@3947 1227
coleenp@3602 1228 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1229 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1230 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1231 while (iter.repeat()) {
coleenp@3602 1232 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1233 node->print_on(st);
coleenp@3602 1234 }
coleenp@3602 1235 }
coleenp@3602 1236 }
coleenp@3602 1237
coleenp@3602 1238 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1239 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1240 VirtualSpaceListIterator iter(list);
coleenp@3602 1241 while (iter.repeat()) {
coleenp@3602 1242 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1243 if (node->reserved()->contains(ptr)) {
coleenp@3602 1244 return true;
coleenp@3602 1245 }
coleenp@3602 1246 }
coleenp@3602 1247 return false;
coleenp@3602 1248 }
coleenp@3602 1249
coleenp@3602 1250
coleenp@3602 1251 // MetaspaceGC methods
coleenp@3602 1252
coleenp@3602 1253 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1254 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1255 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1256 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1257 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1258 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1259 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1260 //
coleenp@3602 1261 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1262 // resize the capacity of the metaspaces. The current implementation
jmasa@4580 1263 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
coleenp@3602 1264 // to resize the Java heap by some GC's. New flags can be implemented
jmasa@4580 1265 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
coleenp@3602 1266 // free space is desirable in the metaspace capacity to decide how much
jmasa@4146 1267 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
coleenp@3602 1268 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1269 // the HWM.
coleenp@3602 1270
coleenp@3602 1271 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1272 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1273 // another expansion is not requested too soon. If that is not
coleenp@3602 1274 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1275 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1276 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1277 // some.
coleenp@3602 1278 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1279 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1280 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1281 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1282 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1283 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1284 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1285 if (delta_words > min_delta_words) {
coleenp@3602 1286 // Don't want to hit the high water mark on the next
coleenp@3602 1287 // allocation so make the delta greater than just enough
coleenp@3602 1288 // for this allocation.
coleenp@3602 1289 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1290 if (delta_words > max_delta_words) {
coleenp@3602 1291 // This allocation is large but the next ones are probably not
coleenp@3602 1292 // so increase by the minimum.
coleenp@3602 1293 delta_words = delta_words + min_delta_words;
coleenp@3602 1294 }
coleenp@3602 1295 }
coleenp@3602 1296 return delta_words;
coleenp@3602 1297 }
coleenp@3602 1298
coleenp@3602 1299 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
jmasa@4580 1300
jmasa@4580 1301 size_t committed_capacity_bytes = MetaspaceAux::allocated_capacity_bytes();
mgerdin@4355 1302 // If the user wants a limit, impose one.
jmasa@4580 1303 size_t max_metaspace_size_bytes = MaxMetaspaceSize;
jmasa@4580 1304 size_t metaspace_size_bytes = MetaspaceSize;
mgerdin@4355 1305 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
mgerdin@4355 1306 MetaspaceAux::reserved_in_bytes() >= MaxMetaspaceSize) {
mgerdin@4355 1307 return false;
mgerdin@4355 1308 }
coleenp@3602 1309
coleenp@3602 1310 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1311 // metadata virtual space.
coleenp@3602 1312 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1313
coleenp@3602 1314 // If this is part of an allocation after a GC, expand
coleenp@3602 1315 // unconditionally.
jmasa@4580 1316 if (MetaspaceGC::expand_after_GC()) {
coleenp@3602 1317 return true;
coleenp@3602 1318 }
coleenp@3602 1319
jmasa@4580 1320
mgerdin@4355 1321
coleenp@3602 1322 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1323 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1324 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1325 // until that minimum capacity is exceeded.
jmasa@4580 1326 if (committed_capacity_bytes < metaspace_size_bytes ||
coleenp@3602 1327 capacity_until_GC() == 0) {
jmasa@4580 1328 set_capacity_until_GC(metaspace_size_bytes);
coleenp@3602 1329 return true;
coleenp@3602 1330 } else {
jmasa@4580 1331 if (committed_capacity_bytes < capacity_until_GC()) {
coleenp@3602 1332 return true;
coleenp@3602 1333 } else {
coleenp@3602 1334 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1335 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1336 " capacity_until_GC " SIZE_FORMAT
jmasa@4580 1337 " allocated_capacity_bytes " SIZE_FORMAT,
coleenp@3602 1338 word_size,
coleenp@3602 1339 capacity_until_GC(),
jmasa@4580 1340 MetaspaceAux::allocated_capacity_bytes());
coleenp@3602 1341 }
coleenp@3602 1342 return false;
coleenp@3602 1343 }
coleenp@3602 1344 }
coleenp@3602 1345 }
coleenp@3602 1346
jmasa@4580 1347
coleenp@3602 1348
coleenp@3602 1349 void MetaspaceGC::compute_new_size() {
coleenp@3602 1350 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1351 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1352 _shrink_factor = 0;
coleenp@3602 1353
jmasa@4580 1354 // Until a faster way of calculating the "used" quantity is implemented,
jmasa@4580 1355 // use "capacity".
jmasa@4580 1356 const size_t used_after_gc = MetaspaceAux::allocated_capacity_bytes();
jmasa@4580 1357 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
coleenp@3602 1358
jmasa@4146 1359 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1360 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1361
coleenp@3602 1362 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1363 size_t minimum_desired_capacity =
coleenp@3602 1364 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1365 // Don't shrink less than the initial generation size
coleenp@3602 1366 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1367 MetaspaceSize);
coleenp@3602 1368
coleenp@3602 1369 if (PrintGCDetails && Verbose) {
coleenp@3602 1370 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1371 gclog_or_tty->print_cr(" "
coleenp@3602 1372 " minimum_free_percentage: %6.2f"
coleenp@3602 1373 " maximum_used_percentage: %6.2f",
coleenp@3602 1374 minimum_free_percentage,
coleenp@3602 1375 maximum_used_percentage);
coleenp@3602 1376 gclog_or_tty->print_cr(" "
jmasa@4580 1377 " used_after_gc : %6.1fKB",
jmasa@4580 1378 used_after_gc / (double) K);
coleenp@3602 1379 }
coleenp@3602 1380
coleenp@3602 1381
jmasa@4580 1382 size_t shrink_bytes = 0;
coleenp@3602 1383 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1384 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1385 // increment the HWM.
coleenp@3602 1386 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1387 // Don't expand unless it's significant
coleenp@3602 1388 if (expand_bytes >= MinMetaspaceExpansion) {
jmasa@4580 1389 MetaspaceGC::set_capacity_until_GC(capacity_until_GC + expand_bytes);
coleenp@3602 1390 }
coleenp@3602 1391 if (PrintGCDetails && Verbose) {
jmasa@4580 1392 size_t new_capacity_until_GC = capacity_until_GC;
coleenp@3602 1393 gclog_or_tty->print_cr(" expanding:"
jmasa@4580 1394 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1395 " expand_bytes: %6.1fKB"
jmasa@4580 1396 " MinMetaspaceExpansion: %6.1fKB"
jmasa@4580 1397 " new metaspace HWM: %6.1fKB",
coleenp@3602 1398 minimum_desired_capacity / (double) K,
coleenp@3602 1399 expand_bytes / (double) K,
coleenp@3602 1400 MinMetaspaceExpansion / (double) K,
coleenp@3602 1401 new_capacity_until_GC / (double) K);
coleenp@3602 1402 }
coleenp@3602 1403 return;
coleenp@3602 1404 }
coleenp@3602 1405
coleenp@3602 1406 // No expansion, now see if we want to shrink
coleenp@3602 1407 // We would never want to shrink more than this
jmasa@4580 1408 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
jmasa@4580 1409 assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
jmasa@4580 1410 max_shrink_bytes));
coleenp@3602 1411
coleenp@3602 1412 // Should shrinking be considered?
jmasa@4146 1413 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1414 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1415 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1416 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1417 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1418 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1419 MetaspaceSize);
jmasa@4580 1420 if (PrintGCDetails && Verbose) {
coleenp@3602 1421 gclog_or_tty->print_cr(" "
coleenp@3602 1422 " maximum_free_percentage: %6.2f"
coleenp@3602 1423 " minimum_used_percentage: %6.2f",
coleenp@3602 1424 maximum_free_percentage,
coleenp@3602 1425 minimum_used_percentage);
coleenp@3602 1426 gclog_or_tty->print_cr(" "
jmasa@4580 1427 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1428 " maximum_desired_capacity: %6.1fKB",
coleenp@3602 1429 minimum_desired_capacity / (double) K,
coleenp@3602 1430 maximum_desired_capacity / (double) K);
coleenp@3602 1431 }
coleenp@3602 1432
coleenp@3602 1433 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1434 "sanity check");
coleenp@3602 1435
coleenp@3602 1436 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1437 // Capacity too large, compute shrinking size
jmasa@4580 1438 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1439 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1440 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1441 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1442 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1443 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1444 // size without shrinking, it goes back to 0%.
jmasa@4580 1445 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
jmasa@4580 1446 assert(shrink_bytes <= max_shrink_bytes,
coleenp@3602 1447 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
jmasa@4580 1448 shrink_bytes, max_shrink_bytes));
coleenp@3602 1449 if (current_shrink_factor == 0) {
coleenp@3602 1450 _shrink_factor = 10;
coleenp@3602 1451 } else {
coleenp@3602 1452 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1453 }
coleenp@3602 1454 if (PrintGCDetails && Verbose) {
coleenp@3602 1455 gclog_or_tty->print_cr(" "
coleenp@3602 1456 " shrinking:"
coleenp@3602 1457 " initSize: %.1fK"
coleenp@3602 1458 " maximum_desired_capacity: %.1fK",
coleenp@3602 1459 MetaspaceSize / (double) K,
coleenp@3602 1460 maximum_desired_capacity / (double) K);
coleenp@3602 1461 gclog_or_tty->print_cr(" "
jmasa@4580 1462 " shrink_bytes: %.1fK"
coleenp@3602 1463 " current_shrink_factor: %d"
coleenp@3602 1464 " new shrink factor: %d"
coleenp@3602 1465 " MinMetaspaceExpansion: %.1fK",
jmasa@4580 1466 shrink_bytes / (double) K,
coleenp@3602 1467 current_shrink_factor,
coleenp@3602 1468 _shrink_factor,
coleenp@3602 1469 MinMetaspaceExpansion / (double) K);
coleenp@3602 1470 }
coleenp@3602 1471 }
coleenp@3602 1472 }
coleenp@3602 1473
coleenp@3602 1474 // Don't shrink unless it's significant
jmasa@4580 1475 if (shrink_bytes >= MinMetaspaceExpansion &&
jmasa@4580 1476 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
jmasa@4580 1477 MetaspaceGC::set_capacity_until_GC(capacity_until_GC - shrink_bytes);
coleenp@3602 1478 }
coleenp@3602 1479 }
coleenp@3602 1480
coleenp@3602 1481 // Metadebug methods
coleenp@3602 1482
coleenp@3602 1483 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1484 size_t chunk_word_size){
coleenp@3602 1485 #ifdef ASSERT
coleenp@3602 1486 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1487 if (MetaDataDeallocateALot &&
coleenp@3602 1488 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1489 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1490 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1491 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1492 if (dummy_chunk == NULL) {
coleenp@3602 1493 break;
coleenp@3602 1494 }
coleenp@3602 1495 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1496
coleenp@3602 1497 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1498 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1499 sm->sum_count_in_chunks_in_use());
coleenp@3602 1500 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1501 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1502 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1503 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1504 }
coleenp@3602 1505 }
coleenp@3602 1506 } else {
coleenp@3602 1507 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1508 }
coleenp@3602 1509 #endif
coleenp@3602 1510 }
coleenp@3602 1511
coleenp@3602 1512 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1513 size_t raw_word_size){
coleenp@3602 1514 #ifdef ASSERT
coleenp@3602 1515 if (MetaDataDeallocateALot &&
coleenp@3602 1516 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1517 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1518 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1519 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1520 if (dummy_block == 0) {
coleenp@3602 1521 break;
coleenp@3602 1522 }
jmasa@3761 1523 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1524 }
coleenp@3602 1525 } else {
coleenp@3602 1526 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1527 }
coleenp@3602 1528 #endif
coleenp@3602 1529 }
coleenp@3602 1530
coleenp@3602 1531 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1532 if (MetadataAllocationFailALot) {
coleenp@3602 1533 _allocation_fail_alot_count =
coleenp@3602 1534 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1535 }
coleenp@3602 1536 }
coleenp@3602 1537
coleenp@3602 1538 #ifdef ASSERT
coleenp@3602 1539 bool Metadebug::test_metadata_failure() {
coleenp@3602 1540 if (MetadataAllocationFailALot &&
coleenp@3602 1541 Threads::is_vm_complete()) {
coleenp@3602 1542 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1543 _allocation_fail_alot_count--;
coleenp@3602 1544 } else {
coleenp@3602 1545 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1546 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1547 "MetadataAllocationFailALot");
coleenp@3602 1548 }
coleenp@3602 1549 init_allocation_fail_alot_count();
coleenp@3602 1550 return true;
coleenp@3602 1551 }
coleenp@3602 1552 }
coleenp@3602 1553 return false;
coleenp@3602 1554 }
coleenp@3602 1555 #endif
coleenp@3602 1556
coleenp@3602 1557 // ChunkManager methods
coleenp@3602 1558
coleenp@3602 1559 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1560 return _free_chunks_total;
coleenp@3602 1561 }
coleenp@3602 1562
coleenp@3602 1563 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1564 return free_chunks_total() * BytesPerWord;
coleenp@3602 1565 }
coleenp@3602 1566
coleenp@3602 1567 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1568 #ifdef ASSERT
coleenp@3602 1569 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1570 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1571 Mutex::_no_safepoint_check_flag);
coleenp@3602 1572 // This lock is only needed in debug because the verification
coleenp@3602 1573 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1574 slow_locked_verify_free_chunks_count();
coleenp@3602 1575 }
coleenp@3602 1576 #endif
mgerdin@3829 1577 return _free_chunks_count;
coleenp@3602 1578 }
coleenp@3602 1579
coleenp@3602 1580 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1581 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1582 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1583 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1584 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1585 sum_free_chunks()));
coleenp@3602 1586 }
coleenp@3602 1587
coleenp@3602 1588 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1589 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1590 Mutex::_no_safepoint_check_flag);
coleenp@3602 1591 locked_verify_free_chunks_total();
coleenp@3602 1592 }
coleenp@3602 1593
coleenp@3602 1594 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1595 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1596 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1597 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1598 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1599 sum_free_chunks_count()));
coleenp@3602 1600 }
coleenp@3602 1601
coleenp@3602 1602 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1603 #ifdef ASSERT
coleenp@3602 1604 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1605 Mutex::_no_safepoint_check_flag);
coleenp@3602 1606 locked_verify_free_chunks_count();
coleenp@3602 1607 #endif
coleenp@3602 1608 }
coleenp@3602 1609
coleenp@3602 1610 void ChunkManager::verify() {
mgerdin@3829 1611 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1612 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1613 locked_verify();
coleenp@3602 1614 }
coleenp@3602 1615
coleenp@3602 1616 void ChunkManager::locked_verify() {
jmasa@3761 1617 locked_verify_free_chunks_count();
coleenp@3602 1618 locked_verify_free_chunks_total();
coleenp@3602 1619 }
coleenp@3602 1620
coleenp@3602 1621 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1622 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1623 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1624 _free_chunks_total, _free_chunks_count);
coleenp@3602 1625 }
coleenp@3602 1626
coleenp@3602 1627 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1628 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1629 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1630 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1631 }
coleenp@3602 1632 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1633 return &_free_chunks[index];
coleenp@3602 1634 }
coleenp@3602 1635
coleenp@3602 1636 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1637 // methods that are used in product builds.
coleenp@3602 1638 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1639 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1640 size_t result = 0;
jmasa@3947 1641 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1642 ChunkList* list = free_chunks(i);
coleenp@3602 1643
coleenp@3602 1644 if (list == NULL) {
coleenp@3602 1645 continue;
coleenp@3602 1646 }
coleenp@3602 1647
jmasa@4497 1648 result = result + list->count() * list->size();
coleenp@3602 1649 }
jmasa@3761 1650 result = result + humongous_dictionary()->total_size();
coleenp@3602 1651 return result;
coleenp@3602 1652 }
coleenp@3602 1653
coleenp@3602 1654 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1655 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1656 size_t count = 0;
jmasa@3947 1657 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1658 ChunkList* list = free_chunks(i);
coleenp@3602 1659 if (list == NULL) {
coleenp@3602 1660 continue;
coleenp@3602 1661 }
jmasa@4497 1662 count = count + list->count();
coleenp@3602 1663 }
jmasa@3761 1664 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1665 return count;
coleenp@3602 1666 }
coleenp@3602 1667
coleenp@3602 1668 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1669 ChunkIndex index = list_index(word_size);
jmasa@3947 1670 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1671 return free_chunks(index);
coleenp@3602 1672 }
coleenp@3602 1673
coleenp@3602 1674 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1675 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1676 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1677 chunk->set_next(free_list->head());
coleenp@3602 1678 free_list->set_head(chunk);
coleenp@3602 1679 // chunk is being returned to the chunk free list
coleenp@3602 1680 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1681 slow_locked_verify();
coleenp@3602 1682 }
coleenp@3602 1683
coleenp@3602 1684 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1685 // The deallocation of a chunk originates in the freelist
coleenp@3602 1686 // manangement code for a Metaspace and does not hold the
coleenp@3602 1687 // lock.
coleenp@3602 1688 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1689 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1690 slow_locked_verify();
coleenp@3602 1691 if (TraceMetadataChunkAllocation) {
coleenp@3602 1692 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1693 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1694 chunk, chunk->word_size());
coleenp@3602 1695 }
coleenp@3602 1696 free_chunks_put(chunk);
coleenp@3602 1697 }
coleenp@3602 1698
coleenp@3602 1699 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1700 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1701
mgerdin@3829 1702 slow_locked_verify();
jmasa@3761 1703
jmasa@3761 1704 Metachunk* chunk = NULL;
jmasa@3947 1705 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1706 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1707 assert(free_list != NULL, "Sanity check");
jmasa@3761 1708
jmasa@3761 1709 chunk = free_list->head();
jmasa@3761 1710 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1711
jmasa@3761 1712 if (chunk == NULL) {
jmasa@3761 1713 return NULL;
jmasa@3761 1714 }
jmasa@3761 1715
coleenp@3602 1716 // Remove the chunk as the head of the list.
jmasa@4497 1717 free_list->remove_chunk(chunk);
jmasa@3947 1718
jmasa@3947 1719 // Chunk is being removed from the chunks free list.
jmasa@3761 1720 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1721
coleenp@3602 1722 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1723 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1724 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1725 free_list, chunk, chunk->word_size());
coleenp@3602 1726 }
coleenp@3602 1727 } else {
jmasa@3761 1728 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1729 word_size,
jmasa@3761 1730 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1731
jmasa@3761 1732 if (chunk != NULL) {
jmasa@3761 1733 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1734 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1735 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1736 " for requested size " SIZE_FORMAT
jmasa@3761 1737 " waste " SIZE_FORMAT,
jmasa@3761 1738 chunk->word_size(), word_size, waste);
coleenp@3602 1739 }
jmasa@3761 1740 // Chunk is being removed from the chunks free list.
jmasa@3761 1741 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3947 1742 } else {
jmasa@3947 1743 return NULL;
coleenp@3602 1744 }
coleenp@3602 1745 }
jmasa@3947 1746
jmasa@3947 1747 // Remove it from the links to this freelist
jmasa@3947 1748 chunk->set_next(NULL);
jmasa@3947 1749 chunk->set_prev(NULL);
jmasa@4572 1750 #ifdef ASSERT
jmasa@4572 1751 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
jmasa@4572 1752 // work.
jmasa@4572 1753 chunk->set_is_free(false);
jmasa@4572 1754 #endif
mgerdin@3829 1755 slow_locked_verify();
coleenp@3602 1756 return chunk;
coleenp@3602 1757 }
coleenp@3602 1758
coleenp@3602 1759 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1760 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1761 slow_locked_verify();
coleenp@3602 1762
coleenp@3602 1763 // Take from the beginning of the list
coleenp@3602 1764 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1765 if (chunk == NULL) {
coleenp@3602 1766 return NULL;
coleenp@3602 1767 }
coleenp@3602 1768
jmasa@3947 1769 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1770 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1771 "Non-humongous variable sized chunk");
coleenp@3602 1772 if (TraceMetadataChunkAllocation) {
jmasa@3947 1773 size_t list_count;
jmasa@3947 1774 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1775 ChunkList* list = find_free_chunks_list(word_size);
jmasa@4497 1776 list_count = list->count();
jmasa@3947 1777 } else {
jmasa@3947 1778 list_count = humongous_dictionary()->total_count();
jmasa@3947 1779 }
jmasa@3947 1780 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1781 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1782 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1783 locked_print_free_chunks(tty);
coleenp@3602 1784 }
coleenp@3602 1785
coleenp@3602 1786 return chunk;
coleenp@3602 1787 }
coleenp@3602 1788
jmasa@3761 1789 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1790 if (PrintFLSStatistics != 0) {
jmasa@3761 1791 humongous_dictionary()->report_statistics();
jmasa@3761 1792 }
jmasa@3761 1793 }
jmasa@3761 1794
coleenp@3602 1795 // SpaceManager methods
coleenp@3602 1796
jmasa@3947 1797 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1798 size_t* chunk_word_size,
jmasa@3947 1799 size_t* class_chunk_word_size) {
jmasa@3947 1800 switch (type) {
jmasa@3947 1801 case Metaspace::BootMetaspaceType:
jmasa@3947 1802 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1803 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1804 break;
jmasa@3947 1805 case Metaspace::ROMetaspaceType:
jmasa@3947 1806 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1807 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1808 break;
jmasa@3947 1809 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1810 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1811 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1812 break;
jmasa@3947 1813 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1814 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1815 *chunk_word_size = SpecializedChunk;
jmasa@3947 1816 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1817 break;
jmasa@3947 1818 default:
jmasa@3947 1819 *chunk_word_size = SmallChunk;
jmasa@3947 1820 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1821 break;
jmasa@3947 1822 }
mikael@4113 1823 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1824 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1825 " class " SIZE_FORMAT,
mikael@4113 1826 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1827 }
jmasa@3947 1828
coleenp@3602 1829 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1830 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1831 size_t free = 0;
jmasa@3947 1832 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1833 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1834 while (chunk != NULL) {
coleenp@3602 1835 free += chunk->free_word_size();
coleenp@3602 1836 chunk = chunk->next();
coleenp@3602 1837 }
coleenp@3602 1838 }
coleenp@3602 1839 return free;
coleenp@3602 1840 }
coleenp@3602 1841
coleenp@3602 1842 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1843 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1844 size_t result = 0;
jmasa@3947 1845 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1846 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1847 }
jmasa@3761 1848
coleenp@3602 1849 return result;
coleenp@3602 1850 }
coleenp@3602 1851
coleenp@3602 1852 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1853 size_t result = 0;
coleenp@3602 1854 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1855 // Count the free space in all the chunk but not the
coleenp@3602 1856 // current chunk from which allocations are still being done.
coleenp@3602 1857 if (chunk != NULL) {
jmasa@3761 1858 Metachunk* prev = chunk;
jmasa@3761 1859 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1860 result += chunk->free_word_size();
jmasa@3761 1861 prev = chunk;
coleenp@3602 1862 chunk = chunk->next();
coleenp@3602 1863 }
coleenp@3602 1864 }
coleenp@3602 1865 return result;
coleenp@3602 1866 }
coleenp@3602 1867
coleenp@3602 1868 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
jmasa@4580 1869 // For CMS use "allocated_chunks_words()" which does not need the
jmasa@4580 1870 // Metaspace lock. For the other collectors sum over the
jmasa@4580 1871 // lists. Use both methods as a check that "allocated_chunks_words()"
jmasa@4580 1872 // is correct. That is, sum_capacity_in_chunks() is too expensive
jmasa@4580 1873 // to use in the product and allocated_chunks_words() should be used
jmasa@4580 1874 // but allow for checking that allocated_chunks_words() returns the same
jmasa@4580 1875 // value as sum_capacity_in_chunks_in_use() which is the definitive
jmasa@4580 1876 // answer.
jmasa@4580 1877 if (UseConcMarkSweepGC) {
jmasa@4580 1878 return allocated_chunks_words();
jmasa@4580 1879 } else {
jmasa@4580 1880 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
jmasa@4580 1881 size_t sum = 0;
jmasa@4580 1882 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@4580 1883 Metachunk* chunk = chunks_in_use(i);
jmasa@4580 1884 while (chunk != NULL) {
jmasa@4580 1885 sum += chunk->capacity_word_size();
jmasa@4580 1886 chunk = chunk->next();
jmasa@4580 1887 }
coleenp@3602 1888 }
jmasa@4580 1889 return sum;
coleenp@3602 1890 }
coleenp@3602 1891 }
coleenp@3602 1892
coleenp@3602 1893 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1894 size_t count = 0;
jmasa@3947 1895 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1896 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1897 }
jmasa@3761 1898
coleenp@3602 1899 return count;
coleenp@3602 1900 }
coleenp@3602 1901
coleenp@3602 1902 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1903 size_t count = 0;
coleenp@3602 1904 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1905 while (chunk != NULL) {
coleenp@3602 1906 count++;
coleenp@3602 1907 chunk = chunk->next();
coleenp@3602 1908 }
coleenp@3602 1909 return count;
coleenp@3602 1910 }
coleenp@3602 1911
coleenp@3602 1912
coleenp@3602 1913 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1914 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1915 size_t used = 0;
jmasa@3947 1916 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1917 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1918 while (chunk != NULL) {
coleenp@3602 1919 used += chunk->used_word_size();
coleenp@3602 1920 chunk = chunk->next();
coleenp@3602 1921 }
coleenp@3602 1922 }
coleenp@3602 1923 return used;
coleenp@3602 1924 }
coleenp@3602 1925
coleenp@3602 1926 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1927
jmasa@3947 1928 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1929 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1930 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1931 chunk_size_name(i), chunk);
jmasa@3947 1932 if (chunk != NULL) {
jmasa@3947 1933 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1934 chunk->free_word_size());
jmasa@3947 1935 } else {
jmasa@3947 1936 st->print_cr("");
jmasa@3947 1937 }
jmasa@3947 1938 }
coleenp@3602 1939
coleenp@3602 1940 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1941 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1942 }
coleenp@3602 1943
coleenp@3602 1944 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1945
coleenp@3602 1946 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1947 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1948 // once a medium chunk has been allocated, no more small
coleenp@3602 1949 // chunks will be allocated.
coleenp@3602 1950 size_t chunk_word_size;
coleenp@3602 1951 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1952 (!has_small_chunk_limit() ||
coleenp@3602 1953 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
jmasa@3947 1954 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1955 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1956 chunk_word_size = medium_chunk_size();
coleenp@3602 1957 }
coleenp@3602 1958 } else {
jmasa@3947 1959 chunk_word_size = medium_chunk_size();
coleenp@3602 1960 }
coleenp@3602 1961
jmasa@3947 1962 // Might still need a humongous chunk. Enforce an
jmasa@3947 1963 // eight word granularity to facilitate reuse (some
jmasa@3947 1964 // wastage but better chance of reuse).
jmasa@3947 1965 size_t if_humongous_sized_chunk =
jmasa@3947 1966 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1967 HumongousChunkGranularity);
coleenp@3602 1968 chunk_word_size =
jmasa@3947 1969 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1970
jmasa@3947 1971 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1972 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1973 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1974 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1975 word_size, chunk_word_size));
coleenp@3602 1976 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1977 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1978 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1979 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1980 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1981 chunk_word_size);
jmasa@3761 1982 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1983 Metachunk::overhead());
coleenp@3602 1984 }
coleenp@3602 1985 return chunk_word_size;
coleenp@3602 1986 }
coleenp@3602 1987
jmasa@3761 1988 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1989 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1990 "Should have been set");
coleenp@3602 1991 assert(current_chunk() == NULL ||
coleenp@3602 1992 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1993 "Don't need to expand");
coleenp@3602 1994 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1995
coleenp@3602 1996 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1997 size_t words_left = 0;
jmasa@3947 1998 size_t words_used = 0;
jmasa@3947 1999 if (current_chunk() != NULL) {
jmasa@3947 2000 words_left = current_chunk()->free_word_size();
jmasa@3947 2001 words_used = current_chunk()->used_word_size();
jmasa@3947 2002 }
coleenp@3602 2003 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 2004 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 2005 " words left",
jmasa@3947 2006 word_size, words_used, words_left);
coleenp@3602 2007 }
coleenp@3602 2008
coleenp@3602 2009 // Get another chunk out of the virtual space
coleenp@3602 2010 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 2011 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 2012
coleenp@3602 2013 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 2014 // and do an allocation from it.
coleenp@3602 2015 if (next != NULL) {
coleenp@3602 2016 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 2017 // Add to this manager's list of chunks in use.
coleenp@3602 2018 add_chunk(next, false);
coleenp@3602 2019 return next->allocate(word_size);
coleenp@3602 2020 }
coleenp@3602 2021 return NULL;
coleenp@3602 2022 }
coleenp@3602 2023
coleenp@3602 2024 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 2025
jmasa@3947 2026 for (ChunkIndex i = ZeroIndex;
jmasa@3761 2027 i < NumberOfInUseLists ;
coleenp@3602 2028 i = next_chunk_index(i) ) {
coleenp@3602 2029 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 2030 chunks_in_use(i),
coleenp@3602 2031 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 2032 }
coleenp@3602 2033 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 2034 " Humongous " SIZE_FORMAT,
coleenp@3602 2035 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 2036 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 2037 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 2038 // block free lists
jmasa@3761 2039 if (block_freelists() != NULL) {
jmasa@3761 2040 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 2041 block_freelists()->total_size());
jmasa@3761 2042 }
coleenp@3602 2043 }
coleenp@3602 2044
jmasa@4727 2045 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
jmasa@4727 2046 Mutex* lock,
jmasa@3947 2047 VirtualSpaceList* vs_list) :
coleenp@3602 2048 _vs_list(vs_list),
jmasa@4727 2049 _mdtype(mdtype),
jmasa@4580 2050 _allocated_blocks_words(0),
jmasa@4580 2051 _allocated_chunks_words(0),
jmasa@4580 2052 _allocated_chunks_count(0),
jmasa@3947 2053 _lock(lock)
jmasa@3947 2054 {
jmasa@3947 2055 initialize();
jmasa@3947 2056 }
jmasa@3947 2057
jmasa@4580 2058 void SpaceManager::inc_size_metrics(size_t words) {
jmasa@4580 2059 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2060 // Total of allocated Metachunks and allocated Metachunks count
jmasa@4580 2061 // for each SpaceManager
jmasa@4580 2062 _allocated_chunks_words = _allocated_chunks_words + words;
jmasa@4580 2063 _allocated_chunks_count++;
jmasa@4580 2064 // Global total of capacity in allocated Metachunks
jmasa@4727 2065 MetaspaceAux::inc_capacity(mdtype(), words);
jmasa@4580 2066 // Global total of allocated Metablocks.
jmasa@4580 2067 // used_words_slow() includes the overhead in each
jmasa@4580 2068 // Metachunk so include it in the used when the
jmasa@4580 2069 // Metachunk is first added (so only added once per
jmasa@4580 2070 // Metachunk).
jmasa@4727 2071 MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
jmasa@4580 2072 }
jmasa@4580 2073
jmasa@4580 2074 void SpaceManager::inc_used_metrics(size_t words) {
jmasa@4580 2075 // Add to the per SpaceManager total
jmasa@4580 2076 Atomic::add_ptr(words, &_allocated_blocks_words);
jmasa@4580 2077 // Add to the global total
jmasa@4727 2078 MetaspaceAux::inc_used(mdtype(), words);
jmasa@4580 2079 }
jmasa@4580 2080
jmasa@4580 2081 void SpaceManager::dec_total_from_size_metrics() {
jmasa@4727 2082 MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
jmasa@4727 2083 MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
jmasa@4580 2084 // Also deduct the overhead per Metachunk
jmasa@4727 2085 MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
jmasa@4580 2086 }
jmasa@4580 2087
jmasa@3947 2088 void SpaceManager::initialize() {
coleenp@3602 2089 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 2090 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2091 _chunks_in_use[i] = NULL;
coleenp@3602 2092 }
coleenp@3602 2093 _current_chunk = NULL;
coleenp@3602 2094 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2095 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2096 }
coleenp@3602 2097 }
coleenp@3602 2098
jmasa@4497 2099 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
jmasa@4497 2100 if (chunks == NULL) {
jmasa@4497 2101 return;
jmasa@4497 2102 }
jmasa@4497 2103 ChunkList* list = free_chunks(index);
jmasa@4497 2104 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
jmasa@4497 2105 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4497 2106 Metachunk* cur = chunks;
jmasa@4497 2107
jmasa@4572 2108 // This returns chunks one at a time. If a new
jmasa@4497 2109 // class List can be created that is a base class
jmasa@4497 2110 // of FreeList then something like FreeList::prepend()
jmasa@4497 2111 // can be used in place of this loop
jmasa@4497 2112 while (cur != NULL) {
jmasa@4572 2113 assert(cur->container() != NULL, "Container should have been set");
jmasa@4572 2114 cur->container()->dec_container_count();
jmasa@4497 2115 // Capture the next link before it is changed
jmasa@4497 2116 // by the call to return_chunk_at_head();
jmasa@4497 2117 Metachunk* next = cur->next();
jmasa@4497 2118 cur->set_is_free(true);
jmasa@4497 2119 list->return_chunk_at_head(cur);
jmasa@4497 2120 cur = next;
jmasa@4497 2121 }
jmasa@4497 2122 }
jmasa@4497 2123
coleenp@3602 2124 SpaceManager::~SpaceManager() {
mgerdin@4349 2125 // This call this->_lock which can't be done while holding expand_lock()
jmasa@4580 2126 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
jmasa@4580 2127 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
jmasa@4580 2128 " allocated_chunks_words() " SIZE_FORMAT,
jmasa@4580 2129 sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
mgerdin@4349 2130
coleenp@3602 2131 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 2132 Mutex::_no_safepoint_check_flag);
coleenp@3602 2133
coleenp@3602 2134 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 2135
mgerdin@3829 2136 chunk_manager->slow_locked_verify();
coleenp@3602 2137
jmasa@4580 2138 dec_total_from_size_metrics();
jmasa@4580 2139
coleenp@3602 2140 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2141 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2142 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 2143 }
coleenp@3602 2144
jmasa@4572 2145 // Do not mangle freed Metachunks. The chunk size inside Metachunks
jmasa@4572 2146 // is during the freeing of a VirtualSpaceNodes.
coleenp@3869 2147
coleenp@3602 2148 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 2149 // below.
jmasa@4580 2150 chunk_manager->inc_free_chunks_total(allocated_chunks_words(),
coleenp@3602 2151 sum_count_in_chunks_in_use());
coleenp@3602 2152
coleenp@3602 2153 // Add all the chunks in use by this space manager
coleenp@3602 2154 // to the global list of free chunks.
coleenp@3602 2155
jmasa@3947 2156 // Follow each list of chunks-in-use and add them to the
jmasa@3947 2157 // free lists. Each list is NULL terminated.
jmasa@3947 2158
jmasa@3947 2159 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 2160 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2161 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 2162 sum_count_in_chunks_in_use(i),
jmasa@3947 2163 chunk_size_name(i));
jmasa@3947 2164 }
jmasa@3947 2165 Metachunk* chunks = chunks_in_use(i);
jmasa@4497 2166 chunk_manager->return_chunks(i, chunks);
jmasa@3947 2167 set_chunks_in_use(i, NULL);
jmasa@3947 2168 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2169 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@4497 2170 chunk_manager->free_chunks(i)->count(),
jmasa@3947 2171 chunk_size_name(i));
jmasa@3947 2172 }
jmasa@3947 2173 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 2174 }
coleenp@3602 2175
jmasa@3947 2176 // The medium chunk case may be optimized by passing the head and
jmasa@3947 2177 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 2178 // the current chunk but there are probably exceptions.
jmasa@3947 2179
coleenp@3602 2180 // Humongous chunks
jmasa@3947 2181 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2182 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 2183 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 2184 chunk_size_name(HumongousIndex));
jmasa@3947 2185 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 2186 }
coleenp@3602 2187 // Humongous chunks are never the current chunk.
coleenp@3602 2188 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2189
jmasa@3761 2190 while (humongous_chunks != NULL) {
jmasa@3761 2191 #ifdef ASSERT
jmasa@3761 2192 humongous_chunks->set_is_free(true);
jmasa@3761 2193 #endif
jmasa@3947 2194 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2195 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 2196 humongous_chunks,
jmasa@3947 2197 humongous_chunks->word_size());
jmasa@3947 2198 }
jmasa@3947 2199 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 2200 align_size_up(humongous_chunks->word_size(),
jmasa@3947 2201 HumongousChunkGranularity),
jmasa@3947 2202 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 2203 " granularity %d",
jmasa@3947 2204 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 2205 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@4572 2206 humongous_chunks->container()->dec_container_count();
jmasa@3761 2207 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2208 humongous_chunks = next_humongous_chunks;
coleenp@3602 2209 }
jmasa@3947 2210 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2211 gclog_or_tty->print_cr("");
jmasa@3947 2212 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 2213 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 2214 chunk_size_name(HumongousIndex));
jmasa@3947 2215 }
mgerdin@3829 2216 chunk_manager->slow_locked_verify();
coleenp@3602 2217 }
coleenp@3602 2218
jmasa@3947 2219 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 2220 switch (index) {
jmasa@3947 2221 case SpecializedIndex:
jmasa@3947 2222 return "Specialized";
jmasa@3947 2223 case SmallIndex:
jmasa@3947 2224 return "Small";
jmasa@3947 2225 case MediumIndex:
jmasa@3947 2226 return "Medium";
jmasa@3947 2227 case HumongousIndex:
jmasa@3947 2228 return "Humongous";
jmasa@3947 2229 default:
jmasa@3947 2230 return NULL;
jmasa@3947 2231 }
jmasa@3947 2232 }
jmasa@3947 2233
jmasa@3947 2234 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2235 switch (size) {
jmasa@3947 2236 case SpecializedChunk:
jmasa@3947 2237 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2238 "Need branch for ClassSpecializedChunk");
jmasa@3947 2239 return SpecializedIndex;
jmasa@3947 2240 case SmallChunk:
jmasa@3947 2241 case ClassSmallChunk:
jmasa@3947 2242 return SmallIndex;
jmasa@3947 2243 case MediumChunk:
jmasa@3947 2244 case ClassMediumChunk:
jmasa@3947 2245 return MediumIndex;
jmasa@3947 2246 default:
jmasa@3948 2247 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2248 "Not a humongous chunk");
jmasa@3947 2249 return HumongousIndex;
jmasa@3947 2250 }
jmasa@3947 2251 }
jmasa@3947 2252
jmasa@3761 2253 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2254 assert_lock_strong(_lock);
jmasa@3761 2255 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2256 assert(word_size >= min_size,
jmasa@3761 2257 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2258 block_freelists()->return_block(p, word_size);
coleenp@3602 2259 }
coleenp@3602 2260
coleenp@3602 2261 // Adds a chunk to the list of chunks in use.
coleenp@3602 2262 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2263
coleenp@3602 2264 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2265 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2266
coleenp@3602 2267 new_chunk->reset_empty();
coleenp@3602 2268
coleenp@3602 2269 // Find the correct list and and set the current
coleenp@3602 2270 // chunk for that list.
jmasa@3947 2271 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2272
jmasa@3947 2273 if (index != HumongousIndex) {
coleenp@3602 2274 set_current_chunk(new_chunk);
jmasa@3947 2275 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2276 set_chunks_in_use(index, new_chunk);
jmasa@3947 2277 } else {
coleenp@3602 2278 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2279 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2280 // chunk.
coleenp@3602 2281 if (make_current) {
coleenp@3602 2282 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2283 set_current_chunk(new_chunk);
coleenp@3602 2284 }
coleenp@3602 2285 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2286 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2287 // any humongous chunks so will not point to the tail
coleenp@3602 2288 // of the humongous chunks list.
coleenp@3602 2289 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2290 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2291
jmasa@3948 2292 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2293 }
coleenp@3602 2294
jmasa@4580 2295 // Add to the running sum of capacity
jmasa@4580 2296 inc_size_metrics(new_chunk->word_size());
jmasa@4580 2297
coleenp@3602 2298 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2299 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2300 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2301 sum_count_in_chunks_in_use());
coleenp@3602 2302 new_chunk->print_on(gclog_or_tty);
jmasa@4580 2303 if (vs_list() != NULL) {
jmasa@4580 2304 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
jmasa@4580 2305 }
coleenp@3602 2306 }
coleenp@3602 2307 }
coleenp@3602 2308
jmasa@3947 2309 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2310 size_t grow_chunks_by_words) {
jmasa@3947 2311
jmasa@3947 2312 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2313 grow_chunks_by_words,
jmasa@3947 2314 medium_chunk_bunch());
jmasa@3947 2315
jmasa@3947 2316 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2317 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2318 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2319 next->word_size());
jmasa@3947 2320 }
jmasa@3947 2321
jmasa@3947 2322 return next;
jmasa@3947 2323 }
jmasa@3947 2324
coleenp@3602 2325 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2326 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2327
iklam@4773 2328 size_t raw_word_size = get_raw_word_size(word_size);
coleenp@3602 2329 BlockFreelist* fl = block_freelists();
jmasa@3761 2330 MetaWord* p = NULL;
coleenp@3602 2331 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2332 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2333 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2334 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2335 // for allocations. Do some profiling. JJJ
jmasa@3761 2336 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2337 p = fl->get_block(raw_word_size);
coleenp@3602 2338 }
jmasa@3761 2339 if (p == NULL) {
jmasa@3761 2340 p = allocate_work(raw_word_size);
coleenp@3602 2341 }
coleenp@3602 2342 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2343
jmasa@3761 2344 return p;
coleenp@3602 2345 }
coleenp@3602 2346
coleenp@3602 2347 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2348 // This methods does not know about blocks (Metablocks)
jmasa@3761 2349 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2350 assert_lock_strong(_lock);
coleenp@3602 2351 #ifdef ASSERT
coleenp@3602 2352 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2353 return NULL;
coleenp@3602 2354 }
coleenp@3602 2355 #endif
coleenp@3602 2356 // Is there space in the current chunk?
jmasa@3761 2357 MetaWord* result = NULL;
coleenp@3602 2358
coleenp@3602 2359 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2360 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2361 // of memory if this returns null.
coleenp@3602 2362 if (DumpSharedSpaces) {
coleenp@3602 2363 assert(current_chunk() != NULL, "should never happen");
jmasa@4580 2364 inc_used_metrics(word_size);
coleenp@3602 2365 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2366 }
coleenp@3602 2367 if (current_chunk() != NULL) {
coleenp@3602 2368 result = current_chunk()->allocate(word_size);
coleenp@3602 2369 }
coleenp@3602 2370
coleenp@3602 2371 if (result == NULL) {
coleenp@3602 2372 result = grow_and_allocate(word_size);
coleenp@3602 2373 }
coleenp@3602 2374 if (result > 0) {
jmasa@4580 2375 inc_used_metrics(word_size);
jmasa@3761 2376 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2377 "Head of the list is being allocated");
coleenp@3602 2378 }
coleenp@3602 2379
coleenp@3602 2380 return result;
coleenp@3602 2381 }
coleenp@3602 2382
coleenp@3602 2383 void SpaceManager::verify() {
coleenp@3602 2384 // If there are blocks in the dictionary, then
coleenp@3602 2385 // verfication of chunks does not work since
coleenp@3602 2386 // being in the dictionary alters a chunk.
jmasa@3761 2387 if (block_freelists()->total_size() == 0) {
jmasa@3947 2388 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2389 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2390 while (curr != NULL) {
coleenp@3602 2391 curr->verify();
jmasa@3892 2392 verify_chunk_size(curr);
coleenp@3602 2393 curr = curr->next();
coleenp@3602 2394 }
coleenp@3602 2395 }
coleenp@3602 2396 }
coleenp@3602 2397 }
coleenp@3602 2398
jmasa@3892 2399 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2400 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2401 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2402 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2403 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2404 "Chunk size is wrong");
jmasa@3892 2405 return;
jmasa@3892 2406 }
jmasa@3892 2407
coleenp@3602 2408 #ifdef ASSERT
jmasa@4580 2409 void SpaceManager::verify_allocated_blocks_words() {
coleenp@3602 2410 // Verification is only guaranteed at a safepoint.
jmasa@4580 2411 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
jmasa@4580 2412 "Verification can fail if the applications is running");
jmasa@4580 2413 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
mikael@4113 2414 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2415 " vs " SIZE_FORMAT,
jmasa@4580 2416 allocated_blocks_words(), sum_used_in_chunks_in_use()));
coleenp@3602 2417 }
coleenp@3602 2418
coleenp@3602 2419 #endif
coleenp@3602 2420
coleenp@3602 2421 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2422 size_t curr_total = 0;
coleenp@3602 2423 size_t waste = 0;
coleenp@3602 2424 uint i = 0;
coleenp@3602 2425 size_t used = 0;
coleenp@3602 2426 size_t capacity = 0;
coleenp@3602 2427
coleenp@3602 2428 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2429 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2430 index < NumberOfInUseLists;
coleenp@3602 2431 index = next_chunk_index(index)) {
coleenp@3602 2432 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2433 curr != NULL;
coleenp@3602 2434 curr = curr->next()) {
coleenp@3602 2435 out->print("%d) ", i++);
coleenp@3602 2436 curr->print_on(out);
coleenp@3602 2437 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2438 block_freelists()->print_on(out);
coleenp@3602 2439 }
coleenp@3602 2440 curr_total += curr->word_size();
coleenp@3602 2441 used += curr->used_word_size();
coleenp@3602 2442 capacity += curr->capacity_word_size();
coleenp@3602 2443 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2444 }
coleenp@3602 2445 }
coleenp@3602 2446
jmasa@3947 2447 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2448 // Free space isn't wasted.
coleenp@3602 2449 waste -= free;
coleenp@3602 2450
coleenp@3602 2451 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2452 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2453 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2454 }
coleenp@3602 2455
coleenp@3869 2456 #ifndef PRODUCT
coleenp@3602 2457 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2458 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2459 index < NumberOfInUseLists;
coleenp@3602 2460 index = next_chunk_index(index)) {
coleenp@3602 2461 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2462 curr != NULL;
coleenp@3602 2463 curr = curr->next()) {
coleenp@3602 2464 curr->mangle();
coleenp@3602 2465 }
coleenp@3602 2466 }
coleenp@3602 2467 }
coleenp@3869 2468 #endif // PRODUCT
coleenp@3602 2469
coleenp@3602 2470 // MetaspaceAux
coleenp@3602 2471
jmasa@4580 2472
jmasa@4727 2473 size_t MetaspaceAux::_allocated_capacity_words[] = {0, 0};
jmasa@4727 2474 size_t MetaspaceAux::_allocated_used_words[] = {0, 0};
jmasa@4580 2475
jmasa@4580 2476 size_t MetaspaceAux::free_bytes() {
jmasa@4580 2477 size_t result = 0;
jmasa@4580 2478 if (Metaspace::class_space_list() != NULL) {
jmasa@4580 2479 result = result + Metaspace::class_space_list()->free_bytes();
jmasa@4580 2480 }
jmasa@4580 2481 if (Metaspace::space_list() != NULL) {
jmasa@4580 2482 result = result + Metaspace::space_list()->free_bytes();
jmasa@4580 2483 }
jmasa@4580 2484 return result;
jmasa@4580 2485 }
jmasa@4580 2486
jmasa@4727 2487 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2488 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4727 2489 assert(words <= allocated_capacity_words(mdtype),
jmasa@4580 2490 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4727 2491 " is greater than _allocated_capacity_words[%u] " SIZE_FORMAT,
jmasa@4727 2492 words, mdtype, allocated_capacity_words(mdtype)));
jmasa@4727 2493 _allocated_capacity_words[mdtype] -= words;
jmasa@4580 2494 }
jmasa@4580 2495
jmasa@4727 2496 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2497 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2498 // Needs to be atomic
jmasa@4727 2499 _allocated_capacity_words[mdtype] += words;
jmasa@4580 2500 }
jmasa@4580 2501
jmasa@4727 2502 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4727 2503 assert(words <= allocated_used_words(mdtype),
jmasa@4580 2504 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4727 2505 " is greater than _allocated_used_words[%u] " SIZE_FORMAT,
jmasa@4727 2506 words, mdtype, allocated_used_words(mdtype)));
jmasa@4580 2507 // For CMS deallocation of the Metaspaces occurs during the
jmasa@4580 2508 // sweep which is a concurrent phase. Protection by the expand_lock()
jmasa@4580 2509 // is not enough since allocation is on a per Metaspace basis
jmasa@4580 2510 // and protected by the Metaspace lock.
jmasa@4580 2511 jlong minus_words = (jlong) - (jlong) words;
jmasa@4727 2512 Atomic::add_ptr(minus_words, &_allocated_used_words[mdtype]);
jmasa@4580 2513 }
jmasa@4580 2514
jmasa@4727 2515 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2516 // _allocated_used_words tracks allocations for
jmasa@4580 2517 // each piece of metadata. Those allocations are
jmasa@4580 2518 // generally done concurrently by different application
jmasa@4580 2519 // threads so must be done atomically.
jmasa@4727 2520 Atomic::add_ptr(words, &_allocated_used_words[mdtype]);
jmasa@4580 2521 }
jmasa@4580 2522
jmasa@4580 2523 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@3607 2524 size_t used = 0;
jmasa@3607 2525 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2526 while (iter.repeat()) {
jmasa@3607 2527 Metaspace* msp = iter.get_next();
jmasa@4580 2528 // Sum allocated_blocks_words for each metaspace
jmasa@3607 2529 if (msp != NULL) {
jmasa@4580 2530 used += msp->used_words_slow(mdtype);
jmasa@3607 2531 }
jmasa@3607 2532 }
jmasa@3607 2533 return used * BytesPerWord;
jmasa@3607 2534 }
jmasa@3607 2535
coleenp@3602 2536 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2537 size_t free = 0;
coleenp@3602 2538 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2539 while (iter.repeat()) {
coleenp@3602 2540 Metaspace* msp = iter.get_next();
coleenp@3602 2541 if (msp != NULL) {
coleenp@3602 2542 free += msp->free_words(mdtype);
coleenp@3602 2543 }
coleenp@3602 2544 }
coleenp@3602 2545 return free * BytesPerWord;
coleenp@3602 2546 }
coleenp@3602 2547
jmasa@4580 2548 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@4580 2549 // Don't count the space in the freelists. That space will be
jmasa@4580 2550 // added to the capacity calculation as needed.
jmasa@4580 2551 size_t capacity = 0;
coleenp@3602 2552 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2553 while (iter.repeat()) {
coleenp@3602 2554 Metaspace* msp = iter.get_next();
coleenp@3602 2555 if (msp != NULL) {
jmasa@4580 2556 capacity += msp->capacity_words_slow(mdtype);
coleenp@3602 2557 }
coleenp@3602 2558 }
coleenp@3602 2559 return capacity * BytesPerWord;
coleenp@3602 2560 }
coleenp@3602 2561
coleenp@3602 2562 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2563 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2564 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2565 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2566 return reserved * BytesPerWord;
coleenp@3602 2567 }
coleenp@3602 2568
jmasa@3947 2569 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
coleenp@3602 2570
coleenp@3602 2571 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2572 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2573 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2574 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2575 chunk->slow_verify();
coleenp@3602 2576 return chunk->free_chunks_total();
coleenp@3602 2577 }
coleenp@3602 2578
coleenp@3602 2579 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2580 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2581 }
coleenp@3602 2582
jmasa@4580 2583 size_t MetaspaceAux::free_chunks_total() {
jmasa@4580 2584 return free_chunks_total(Metaspace::ClassType) +
jmasa@4580 2585 free_chunks_total(Metaspace::NonClassType);
jmasa@4580 2586 }
jmasa@4580 2587
jmasa@4580 2588 size_t MetaspaceAux::free_chunks_total_in_bytes() {
jmasa@4580 2589 return free_chunks_total() * BytesPerWord;
jmasa@4580 2590 }
jmasa@4580 2591
coleenp@3602 2592 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2593 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2594 if (PrintGCDetails && Verbose) {
coleenp@3602 2595 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2596 "->" SIZE_FORMAT
jmasa@4580 2597 "(" SIZE_FORMAT ")",
coleenp@3602 2598 prev_metadata_used,
jmasa@4875 2599 allocated_used_bytes(),
coleenp@3602 2600 reserved_in_bytes());
coleenp@3602 2601 } else {
coleenp@3602 2602 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2603 "->" SIZE_FORMAT "K"
jmasa@4580 2604 "(" SIZE_FORMAT "K)",
coleenp@3602 2605 prev_metadata_used / K,
jmasa@4875 2606 allocated_used_bytes() / K,
coleenp@3602 2607 reserved_in_bytes()/ K);
coleenp@3602 2608 }
coleenp@3602 2609
coleenp@3602 2610 gclog_or_tty->print("]");
coleenp@3602 2611 }
coleenp@3602 2612
coleenp@3602 2613 // This is printed when PrintGCDetails
coleenp@3602 2614 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2615 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2616 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2617
coleenp@3602 2618 out->print_cr(" Metaspace total "
coleenp@3602 2619 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2620 " reserved " SIZE_FORMAT "K",
jmasa@4580 2621 allocated_capacity_bytes()/K, allocated_used_bytes()/K, reserved_in_bytes()/K);
jmasa@4727 2622
jmasa@4727 2623 out->print_cr(" data space "
jmasa@4727 2624 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4727 2625 " reserved " SIZE_FORMAT "K",
jmasa@4727 2626 allocated_capacity_bytes(nct)/K,
jmasa@4727 2627 allocated_used_bytes(nct)/K,
jmasa@4727 2628 reserved_in_bytes(nct)/K);
jmasa@4727 2629 out->print_cr(" class space "
jmasa@4727 2630 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4727 2631 " reserved " SIZE_FORMAT "K",
jmasa@4727 2632 allocated_capacity_bytes(ct)/K,
jmasa@4727 2633 allocated_used_bytes(ct)/K,
jmasa@4727 2634 reserved_in_bytes(ct)/K);
coleenp@3602 2635 }
coleenp@3602 2636
coleenp@3602 2637 // Print information for class space and data space separately.
coleenp@3602 2638 // This is almost the same as above.
coleenp@3602 2639 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2640 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
jmasa@4580 2641 size_t capacity_bytes = capacity_bytes_slow(mdtype);
jmasa@4580 2642 size_t used_bytes = used_bytes_slow(mdtype);
coleenp@3602 2643 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2644 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2645 free_chunks_capacity_bytes;
coleenp@3602 2646 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2647 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2648 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2649 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2650 used_bytes / K,
coleenp@3602 2651 free_bytes / K,
coleenp@3602 2652 free_chunks_capacity_bytes / K,
coleenp@3602 2653 used_and_free / K,
coleenp@3602 2654 capacity_bytes / K);
mgerdin@4303 2655 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2656 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2657 }
coleenp@3602 2658
coleenp@3602 2659 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2660 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2661
jmasa@3947 2662 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0;
jmasa@3947 2663 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0;
jmasa@3947 2664 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
jmasa@3947 2665 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0;
coleenp@3602 2666
coleenp@3602 2667 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2668 while (iter.repeat()) {
coleenp@3602 2669 Metaspace* msp = iter.get_next();
coleenp@3602 2670 if (msp != NULL) {
jmasa@3947 2671 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2672 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2673 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2674 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2675 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2676 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2677 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2678 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
jmasa@3947 2679
jmasa@3947 2680 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2681 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2682 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2683 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2684 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2685 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2686 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2687 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2688 }
coleenp@3602 2689 }
coleenp@3602 2690 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2691 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2692 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
jmasa@3947 2693 SIZE_FORMAT " medium(s) " SIZE_FORMAT,
jmasa@3947 2694 specialized_count, specialized_waste, small_count,
jmasa@3947 2695 small_waste, medium_count, medium_waste);
jmasa@3947 2696 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2697 SIZE_FORMAT " small(s) " SIZE_FORMAT,
jmasa@3947 2698 cls_specialized_count, cls_specialized_waste,
jmasa@3947 2699 cls_small_count, cls_small_waste);
coleenp@3602 2700 }
coleenp@3602 2701
coleenp@3602 2702 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2703 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2704 out->print_cr("All Metaspace:");
coleenp@3602 2705 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2706 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2707 print_waste(out);
coleenp@3602 2708 }
coleenp@3602 2709
mgerdin@3829 2710 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2711 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2712 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2713 }
mgerdin@3829 2714
jmasa@4580 2715 void MetaspaceAux::verify_capacity() {
jmasa@4580 2716 #ifdef ASSERT
jmasa@4580 2717 size_t running_sum_capacity_bytes = allocated_capacity_bytes();
jmasa@4727 2718 // For purposes of the running sum of capacity, verify against capacity
jmasa@4580 2719 size_t capacity_in_use_bytes = capacity_bytes_slow();
jmasa@4580 2720 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
jmasa@4580 2721 err_msg("allocated_capacity_words() * BytesPerWord " SIZE_FORMAT
jmasa@4580 2722 " capacity_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2723 running_sum_capacity_bytes, capacity_in_use_bytes));
jmasa@4727 2724 for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@4727 2725 i < Metaspace:: MetadataTypeCount;
jmasa@4727 2726 i = (Metaspace::MetadataType)(i + 1)) {
jmasa@4727 2727 size_t capacity_in_use_bytes = capacity_bytes_slow(i);
jmasa@4727 2728 assert(allocated_capacity_bytes(i) == capacity_in_use_bytes,
jmasa@4727 2729 err_msg("allocated_capacity_bytes(%u) " SIZE_FORMAT
jmasa@4727 2730 " capacity_bytes_slow(%u)" SIZE_FORMAT,
jmasa@4727 2731 i, allocated_capacity_bytes(i), i, capacity_in_use_bytes));
jmasa@4727 2732 }
jmasa@4580 2733 #endif
jmasa@4580 2734 }
jmasa@4580 2735
jmasa@4580 2736 void MetaspaceAux::verify_used() {
jmasa@4580 2737 #ifdef ASSERT
jmasa@4580 2738 size_t running_sum_used_bytes = allocated_used_bytes();
jmasa@4727 2739 // For purposes of the running sum of used, verify against used
jmasa@4580 2740 size_t used_in_use_bytes = used_bytes_slow();
jmasa@4580 2741 assert(allocated_used_bytes() == used_in_use_bytes,
jmasa@4580 2742 err_msg("allocated_used_bytes() " SIZE_FORMAT
jmasa@4727 2743 " used_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2744 allocated_used_bytes(), used_in_use_bytes));
jmasa@4727 2745 for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@4727 2746 i < Metaspace:: MetadataTypeCount;
jmasa@4727 2747 i = (Metaspace::MetadataType)(i + 1)) {
jmasa@4727 2748 size_t used_in_use_bytes = used_bytes_slow(i);
jmasa@4727 2749 assert(allocated_used_bytes(i) == used_in_use_bytes,
jmasa@4727 2750 err_msg("allocated_used_bytes(%u) " SIZE_FORMAT
jmasa@4727 2751 " used_bytes_slow(%u)" SIZE_FORMAT,
jmasa@4727 2752 i, allocated_used_bytes(i), i, used_in_use_bytes));
jmasa@4727 2753 }
jmasa@4580 2754 #endif
jmasa@4580 2755 }
jmasa@4580 2756
jmasa@4580 2757 void MetaspaceAux::verify_metrics() {
jmasa@4580 2758 verify_capacity();
jmasa@4580 2759 verify_used();
jmasa@4580 2760 }
jmasa@4580 2761
jmasa@4580 2762
coleenp@3602 2763 // Metaspace methods
coleenp@3602 2764
coleenp@3602 2765 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2766 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2767
jmasa@3947 2768 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2769 initialize(lock, type);
coleenp@3602 2770 }
coleenp@3602 2771
coleenp@3602 2772 Metaspace::~Metaspace() {
coleenp@3602 2773 delete _vsm;
coleenp@3602 2774 delete _class_vsm;
coleenp@3602 2775 }
coleenp@3602 2776
coleenp@3602 2777 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2778 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2779
coleenp@3602 2780 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2781
coleenp@3602 2782 void Metaspace::global_initialize() {
coleenp@3602 2783 // Initialize the alignment for shared spaces.
coleenp@3602 2784 int max_alignment = os::vm_page_size();
coleenp@3602 2785 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2786
coleenp@3602 2787 if (DumpSharedSpaces) {
coleenp@3602 2788 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2789 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2790 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2791 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2792
coleenp@3602 2793 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2794 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2795 // remainder is the misc code and data chunks.
coleenp@3602 2796 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2797 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2798 os::vm_allocation_granularity());
coleenp@3602 2799 size_t word_size = total/wordSize;
coleenp@3602 2800 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2801 } else {
coleenp@3602 2802 // If using shared space, open the file that contains the shared space
coleenp@3602 2803 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2804 // the addresses don't conflict)
coleenp@3602 2805 if (UseSharedSpaces) {
coleenp@3602 2806 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2807 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2808
coleenp@3602 2809 // Open the shared archive file, read and validate the header. If
coleenp@3602 2810 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2811 // disabled and the file is closed.
coleenp@3602 2812 // Map in spaces now also
coleenp@3602 2813 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2814 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2815 } else {
coleenp@3602 2816 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2817 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2818 }
coleenp@3602 2819 }
coleenp@3602 2820
jmasa@3947 2821 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 2822 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 2823 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 2824 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 2825 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 2826 // from there. This size calculated by -version.
jmasa@3947 2827 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
jmasa@3947 2828 (ClassMetaspaceSize/BytesPerWord)*2);
jmasa@3947 2829 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 2830 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2831 // of the boot class loader size.
jmasa@3947 2832 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 2833 // Initialize the list of virtual spaces.
coleenp@3602 2834 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2835 }
coleenp@3602 2836 }
coleenp@3602 2837
coleenp@3602 2838 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2839 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2840 // argument passed in is at the top of the compressed space
coleenp@3602 2841 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2842 // The reserved space size may be bigger because of alignment, esp with UseLargePages
mikael@4113 2843 assert(rs.size() >= ClassMetaspaceSize,
mikael@4113 2844 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize));
coleenp@3602 2845 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2846 }
coleenp@3602 2847
jmasa@3947 2848 void Metaspace::initialize(Mutex* lock,
jmasa@3947 2849 MetaspaceType type) {
coleenp@3602 2850
coleenp@3602 2851 assert(space_list() != NULL,
coleenp@3602 2852 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2853
jmasa@4727 2854 _vsm = new SpaceManager(Metaspace::NonClassType, lock, space_list());
coleenp@3602 2855 if (_vsm == NULL) {
coleenp@3602 2856 return;
coleenp@3602 2857 }
jmasa@3947 2858 size_t word_size;
jmasa@3947 2859 size_t class_word_size;
jmasa@3947 2860 vsm()->get_initial_chunk_sizes(type,
jmasa@3947 2861 &word_size,
jmasa@3947 2862 &class_word_size);
coleenp@3602 2863
coleenp@3602 2864 assert(class_space_list() != NULL,
coleenp@3602 2865 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2866
coleenp@3602 2867 // Allocate SpaceManager for classes.
jmasa@4727 2868 _class_vsm = new SpaceManager(Metaspace::ClassType, lock, class_space_list());
coleenp@3602 2869 if (_class_vsm == NULL) {
coleenp@3602 2870 return;
coleenp@3602 2871 }
coleenp@3602 2872
coleenp@3602 2873 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2874
coleenp@3602 2875 // Allocate chunk for metadata objects
coleenp@3602 2876 Metachunk* new_chunk =
jmasa@3947 2877 space_list()->get_initialization_chunk(word_size,
jmasa@3947 2878 vsm()->medium_chunk_bunch());
coleenp@3602 2879 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2880 if (new_chunk != NULL) {
coleenp@3602 2881 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2882 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2883 }
coleenp@3602 2884
coleenp@3602 2885 // Allocate chunk for class metadata objects
coleenp@3602 2886 Metachunk* class_chunk =
jmasa@3947 2887 class_space_list()->get_initialization_chunk(class_word_size,
jmasa@3947 2888 class_vsm()->medium_chunk_bunch());
coleenp@3602 2889 if (class_chunk != NULL) {
coleenp@3602 2890 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2891 }
iklam@4773 2892
iklam@4773 2893 _alloc_record_head = NULL;
iklam@4773 2894 _alloc_record_tail = NULL;
coleenp@3602 2895 }
coleenp@3602 2896
jmasa@3947 2897 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 2898 size_t byte_size = word_size * wordSize;
jmasa@3947 2899 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@3947 2900 }
jmasa@3947 2901
coleenp@3602 2902 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2903 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2904 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2905 return class_vsm()->allocate(word_size);
coleenp@3602 2906 } else {
jmasa@3761 2907 return vsm()->allocate(word_size);
coleenp@3602 2908 }
coleenp@3602 2909 }
coleenp@3602 2910
jmasa@3629 2911 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2912 MetaWord* result;
jmasa@3629 2913 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2914 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@4580 2915 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size) * BytesPerWord;
jmasa@4580 2916 MetaspaceGC::inc_capacity_until_GC(delta_bytes);
jmasa@3629 2917 if (PrintGCDetails && Verbose) {
jmasa@3629 2918 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2919 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2920 }
jmasa@3761 2921
jmasa@3629 2922 result = allocate(word_size, mdtype);
jmasa@3629 2923
jmasa@3629 2924 return result;
jmasa@3629 2925 }
jmasa@3629 2926
coleenp@3602 2927 // Space allocated in the Metaspace. This may
coleenp@3602 2928 // be across several metadata virtual spaces.
coleenp@3602 2929 char* Metaspace::bottom() const {
coleenp@3602 2930 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2931 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2932 }
coleenp@3602 2933
jmasa@4580 2934 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
jmasa@4580 2935 // return vsm()->allocated_used_words();
coleenp@3602 2936 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2937 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2938 }
coleenp@3602 2939
coleenp@3602 2940 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2941 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2942 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2943 }
coleenp@3602 2944
coleenp@3602 2945 // Space capacity in the Metaspace. It includes
coleenp@3602 2946 // space in the list of chunks from which allocations
coleenp@3602 2947 // have been made. Don't include space in the global freelist and
coleenp@3602 2948 // in the space available in the dictionary which
coleenp@3602 2949 // is already counted in some chunk.
jmasa@4580 2950 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
coleenp@3602 2951 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2952 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2953 }
coleenp@3602 2954
jmasa@4580 2955 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
jmasa@4580 2956 return used_words_slow(mdtype) * BytesPerWord;
jmasa@4580 2957 }
jmasa@4580 2958
jmasa@4580 2959 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
jmasa@4580 2960 return capacity_words_slow(mdtype) * BytesPerWord;
jmasa@4580 2961 }
jmasa@4580 2962
coleenp@3602 2963 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2964 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2965 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2966 // Don't take Heap_lock
mgerdin@4588 2967 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
jmasa@3761 2968 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2969 // Dark matter. Too small for dictionary.
jmasa@3761 2970 #ifdef ASSERT
jmasa@3761 2971 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2972 #endif
jmasa@3761 2973 return;
jmasa@3761 2974 }
coleenp@3602 2975 if (is_class) {
jmasa@3761 2976 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2977 } else {
jmasa@3761 2978 vsm()->deallocate(ptr, word_size);
coleenp@3602 2979 }
coleenp@3602 2980 } else {
mgerdin@4588 2981 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2982
jmasa@3761 2983 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2984 // Dark matter. Too small for dictionary.
jmasa@3761 2985 #ifdef ASSERT
jmasa@3761 2986 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2987 #endif
jmasa@3761 2988 return;
jmasa@3761 2989 }
coleenp@3602 2990 if (is_class) {
jmasa@3761 2991 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2992 } else {
jmasa@3761 2993 vsm()->deallocate(ptr, word_size);
coleenp@3602 2994 }
coleenp@3602 2995 }
coleenp@3602 2996 }
coleenp@3602 2997
jmasa@3761 2998 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
iklam@4773 2999 bool read_only, MetaspaceObj::Type type, TRAPS) {
coleenp@3602 3000 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 3001 assert(false, "Should not allocate with exception pending");
coleenp@3602 3002 return NULL; // caller does a CHECK_NULL too
coleenp@3602 3003 }
coleenp@3602 3004
iklam@4773 3005 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
iklam@4773 3006
coleenp@3602 3007 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 3008 MetaWord* result = NULL;
coleenp@3602 3009
coleenp@3602 3010 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 3011 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 3012 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 3013 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 3014 // to revisit this for application class data sharing.
coleenp@3602 3015 if (DumpSharedSpaces) {
iklam@4773 3016 assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity");
iklam@4773 3017 Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace();
iklam@4773 3018 result = space->allocate(word_size, NonClassType);
coleenp@3602 3019 if (result == NULL) {
coleenp@3602 3020 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
iklam@4773 3021 } else {
iklam@4773 3022 space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
coleenp@3602 3023 }
jmasa@3761 3024 return Metablock::initialize(result, word_size);
coleenp@3602 3025 }
coleenp@3602 3026
coleenp@3602 3027 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 3028
coleenp@3602 3029 if (result == NULL) {
coleenp@3602 3030 // Try to clean out some memory and retry.
coleenp@3602 3031 result =
jmasa@3761 3032 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 3033 loader_data, word_size, mdtype);
coleenp@3602 3034
coleenp@3602 3035 // If result is still null, we are out of memory.
coleenp@3602 3036 if (result == NULL) {
jmasa@3947 3037 if (Verbose && TraceMetadataChunkAllocation) {
jmasa@3947 3038 gclog_or_tty->print_cr("Metaspace allocation failed for size "
jmasa@3947 3039 SIZE_FORMAT, word_size);
jmasa@3947 3040 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty);
jmasa@3947 3041 MetaspaceAux::dump(gclog_or_tty);
jmasa@3947 3042 }
coleenp@3602 3043 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 3044 report_java_out_of_memory("Metadata space");
coleenp@3602 3045
coleenp@3602 3046 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 3047 JvmtiExport::post_resource_exhausted(
coleenp@3602 3048 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 3049 "Metadata space");
coleenp@3602 3050 }
coleenp@3602 3051 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 3052 }
coleenp@3602 3053 }
jmasa@3761 3054 return Metablock::initialize(result, word_size);
coleenp@3602 3055 }
coleenp@3602 3056
iklam@4773 3057 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
iklam@4773 3058 assert(DumpSharedSpaces, "sanity");
iklam@4773 3059
iklam@4773 3060 AllocRecord *rec = new AllocRecord((address)ptr, type, (int)word_size * HeapWordSize);
iklam@4773 3061 if (_alloc_record_head == NULL) {
iklam@4773 3062 _alloc_record_head = _alloc_record_tail = rec;
iklam@4773 3063 } else {
iklam@4773 3064 _alloc_record_tail->_next = rec;
iklam@4773 3065 _alloc_record_tail = rec;
iklam@4773 3066 }
iklam@4773 3067 }
iklam@4773 3068
iklam@4773 3069 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
iklam@4773 3070 assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
iklam@4773 3071
iklam@4773 3072 address last_addr = (address)bottom();
iklam@4773 3073
iklam@4773 3074 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
iklam@4773 3075 address ptr = rec->_ptr;
iklam@4773 3076 if (last_addr < ptr) {
iklam@4773 3077 closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr);
iklam@4773 3078 }
iklam@4773 3079 closure->doit(ptr, rec->_type, rec->_byte_size);
iklam@4773 3080 last_addr = ptr + rec->_byte_size;
iklam@4773 3081 }
iklam@4773 3082
iklam@4773 3083 address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType);
iklam@4773 3084 if (last_addr < top) {
iklam@4773 3085 closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr);
iklam@4773 3086 }
iklam@4773 3087 }
iklam@4773 3088
jmasa@4572 3089 void Metaspace::purge() {
jmasa@4572 3090 MutexLockerEx cl(SpaceManager::expand_lock(),
jmasa@4572 3091 Mutex::_no_safepoint_check_flag);
jmasa@4572 3092 space_list()->purge();
jmasa@4572 3093 class_space_list()->purge();
jmasa@4572 3094 }
jmasa@4572 3095
coleenp@3602 3096 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 3097 // Print both class virtual space counts and metaspace.
coleenp@3602 3098 if (Verbose) {
coleenp@3602 3099 vsm()->print_on(out);
coleenp@3602 3100 class_vsm()->print_on(out);
coleenp@3602 3101 }
coleenp@3602 3102 }