annotate src/share/vm/memory/metaspace.cpp @ 3892:eade6b2e4782

8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp Reviewed-by: coleenp
author jmasa
date Thu, 29 Nov 2012 10:09:04 -0800
parents 5fafdef522c6
children c71879335291
rev   line source
coleenp@3602 1 /*
coleenp@3602 2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
coleenp@3602 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@3602 4 *
coleenp@3602 5 * This code is free software; you can redistribute it and/or modify it
coleenp@3602 6 * under the terms of the GNU General Public License version 2 only, as
coleenp@3602 7 * published by the Free Software Foundation.
coleenp@3602 8 *
coleenp@3602 9 * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@3602 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@3602 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
coleenp@3602 12 * version 2 for more details (a copy is included in the LICENSE file that
coleenp@3602 13 * accompanied this code).
coleenp@3602 14 *
coleenp@3602 15 * You should have received a copy of the GNU General Public License version
coleenp@3602 16 * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@3602 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@3602 18 *
coleenp@3602 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@3602 20 * or visit www.oracle.com if you need additional information or have any
coleenp@3602 21 * questions.
coleenp@3602 22 *
coleenp@3602 23 */
coleenp@3602 24 #include "precompiled.hpp"
coleenp@3602 25 #include "gc_interface/collectedHeap.hpp"
coleenp@3602 26 #include "memory/binaryTreeDictionary.hpp"
jmasa@3761 27 #include "memory/freeList.hpp"
coleenp@3602 28 #include "memory/collectorPolicy.hpp"
coleenp@3602 29 #include "memory/filemap.hpp"
coleenp@3602 30 #include "memory/freeList.hpp"
jmasa@3761 31 #include "memory/metablock.hpp"
jmasa@3761 32 #include "memory/metachunk.hpp"
coleenp@3602 33 #include "memory/metaspace.hpp"
coleenp@3602 34 #include "memory/metaspaceShared.hpp"
coleenp@3602 35 #include "memory/resourceArea.hpp"
coleenp@3602 36 #include "memory/universe.hpp"
coleenp@3602 37 #include "runtime/globals.hpp"
coleenp@3602 38 #include "runtime/mutex.hpp"
coleenp@3860 39 #include "runtime/orderAccess.hpp"
coleenp@3602 40 #include "services/memTracker.hpp"
coleenp@3602 41 #include "utilities/copy.hpp"
coleenp@3602 42 #include "utilities/debug.hpp"
coleenp@3602 43
jmasa@3761 44 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
jmasa@3761 45 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
mgerdin@3829 46 // Define this macro to enable slow integrity checking of
mgerdin@3829 47 // the free chunk lists
mgerdin@3829 48 const bool metaspace_slow_verify = false;
mgerdin@3829 49
coleenp@3602 50
coleenp@3602 51 // Parameters for stress mode testing
coleenp@3602 52 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 53 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 54 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 55 const size_t metadata_deallocate = 0xf5f5f5f5;
coleenp@3602 56
coleenp@3602 57 MetaWord* last_allocated = 0;
coleenp@3602 58
coleenp@3602 59 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 60 enum ChunkIndex {
coleenp@3602 61 SmallIndex = 0,
coleenp@3602 62 MediumIndex = 1,
coleenp@3602 63 HumongousIndex = 2,
jmasa@3761 64 NumberOfFreeLists = 2,
jmasa@3761 65 NumberOfInUseLists = 3
coleenp@3602 66 };
coleenp@3602 67
coleenp@3602 68 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 69 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 70 return (ChunkIndex) (i+1);
coleenp@3602 71 }
coleenp@3602 72
coleenp@3602 73 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 74 // the default MetaspaceSize before argument processing was being
coleenp@3602 75 // used which was not the desired value. See the code
coleenp@3602 76 // in should_expand() to see how the initialization is handled
coleenp@3602 77 // now.
coleenp@3602 78 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 79 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 80 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 81 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 82
coleenp@3602 83 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 84 //
coleenp@3602 85 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 86 // allocated there is no explicit link between a Metachunk and
coleenp@3602 87 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 88 //
coleenp@3602 89 // Each SpaceManager maintains a
coleenp@3602 90 // list of the chunks it is using and the current chunk. The current
coleenp@3602 91 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 92 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 93 // reused from there.
coleenp@3602 94
coleenp@3602 95 // Pointer to list of Metachunks.
coleenp@3602 96 class ChunkList VALUE_OBJ_CLASS_SPEC {
coleenp@3602 97 // List of free chunks
coleenp@3602 98 Metachunk* _head;
coleenp@3602 99
coleenp@3602 100 public:
coleenp@3602 101 // Constructor
coleenp@3602 102 ChunkList() : _head(NULL) {}
coleenp@3602 103
coleenp@3602 104 // Accessors
coleenp@3602 105 Metachunk* head() { return _head; }
coleenp@3602 106 void set_head(Metachunk* v) { _head = v; }
coleenp@3602 107
coleenp@3602 108 // Link at head of the list
coleenp@3602 109 void add_at_head(Metachunk* head, Metachunk* tail);
coleenp@3602 110 void add_at_head(Metachunk* head);
coleenp@3602 111
coleenp@3602 112 size_t sum_list_size();
coleenp@3602 113 size_t sum_list_count();
coleenp@3602 114 size_t sum_list_capacity();
coleenp@3602 115 };
coleenp@3602 116
coleenp@3602 117 // Manages the global free lists of chunks.
coleenp@3602 118 // Has three lists of free chunks, and a total size and
coleenp@3602 119 // count that includes all three
coleenp@3602 120
coleenp@3602 121 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 122
coleenp@3602 123 // Free list of chunks of different sizes.
coleenp@3602 124 // SmallChunk
coleenp@3602 125 // MediumChunk
coleenp@3602 126 // HumongousChunk
jmasa@3761 127 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 128
jmasa@3761 129 // HumongousChunk
jmasa@3761 130 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 131
coleenp@3602 132 // ChunkManager in all lists of this type
coleenp@3602 133 size_t _free_chunks_total;
coleenp@3602 134 size_t _free_chunks_count;
coleenp@3602 135
coleenp@3602 136 void dec_free_chunks_total(size_t v) {
coleenp@3602 137 assert(_free_chunks_count > 0 &&
coleenp@3602 138 _free_chunks_total > 0,
coleenp@3602 139 "About to go negative");
coleenp@3602 140 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 141 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 142 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 143 }
coleenp@3602 144
coleenp@3602 145 // Debug support
coleenp@3602 146
coleenp@3602 147 size_t sum_free_chunks();
coleenp@3602 148 size_t sum_free_chunks_count();
coleenp@3602 149
coleenp@3602 150 void locked_verify_free_chunks_total();
mgerdin@3829 151 void slow_locked_verify_free_chunks_total() {
mgerdin@3829 152 if (metaspace_slow_verify) {
mgerdin@3829 153 locked_verify_free_chunks_total();
mgerdin@3829 154 }
mgerdin@3829 155 }
coleenp@3602 156 void locked_verify_free_chunks_count();
mgerdin@3829 157 void slow_locked_verify_free_chunks_count() {
mgerdin@3829 158 if (metaspace_slow_verify) {
mgerdin@3829 159 locked_verify_free_chunks_count();
mgerdin@3829 160 }
mgerdin@3829 161 }
coleenp@3602 162 void verify_free_chunks_count();
coleenp@3602 163
coleenp@3602 164 public:
coleenp@3602 165
coleenp@3602 166 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 167
coleenp@3602 168 // add or delete (return) a chunk to the global freelist.
coleenp@3602 169 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 170 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 171
coleenp@3602 172 // Total of the space in the free chunks list
coleenp@3602 173 size_t free_chunks_total();
coleenp@3602 174 size_t free_chunks_total_in_bytes();
coleenp@3602 175
coleenp@3602 176 // Number of chunks in the free chunks list
coleenp@3602 177 size_t free_chunks_count();
coleenp@3602 178
coleenp@3602 179 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 180 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 181 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 182 }
coleenp@3602 183 ChunkList* free_medium_chunks() { return &_free_chunks[1]; }
coleenp@3602 184 ChunkList* free_small_chunks() { return &_free_chunks[0]; }
jmasa@3761 185 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 186 return &_humongous_dictionary;
jmasa@3761 187 }
coleenp@3602 188
coleenp@3602 189 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 190
coleenp@3602 191 // Returns the list for the given chunk word size.
coleenp@3602 192 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 193
coleenp@3602 194 // Add and remove from a list by size. Selects
coleenp@3602 195 // list based on size of chunk.
coleenp@3602 196 void free_chunks_put(Metachunk* chuck);
coleenp@3602 197 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 198
coleenp@3602 199 // Debug support
coleenp@3602 200 void verify();
mgerdin@3829 201 void slow_verify() {
mgerdin@3829 202 if (metaspace_slow_verify) {
mgerdin@3829 203 verify();
mgerdin@3829 204 }
mgerdin@3829 205 }
coleenp@3602 206 void locked_verify();
mgerdin@3829 207 void slow_locked_verify() {
mgerdin@3829 208 if (metaspace_slow_verify) {
mgerdin@3829 209 locked_verify();
mgerdin@3829 210 }
mgerdin@3829 211 }
coleenp@3602 212 void verify_free_chunks_total();
coleenp@3602 213
coleenp@3602 214 void locked_print_free_chunks(outputStream* st);
coleenp@3602 215 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 216
jmasa@3761 217 void print_on(outputStream* st);
coleenp@3602 218 };
coleenp@3602 219
coleenp@3602 220
coleenp@3602 221 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 222 // to the allocation of a quantum of metadata).
coleenp@3602 223 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 224 BlockTreeDictionary* _dictionary;
jmasa@3761 225 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 226
coleenp@3602 227 // Accessors
jmasa@3761 228 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 229
coleenp@3602 230 public:
coleenp@3602 231 BlockFreelist();
coleenp@3602 232 ~BlockFreelist();
coleenp@3602 233
coleenp@3602 234 // Get and return a block to the free list
jmasa@3761 235 MetaWord* get_block(size_t word_size);
jmasa@3761 236 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 237
jmasa@3761 238 size_t total_size() {
jmasa@3761 239 if (dictionary() == NULL) {
coleenp@3602 240 return 0;
jmasa@3761 241 } else {
jmasa@3761 242 return dictionary()->total_size();
coleenp@3602 243 }
jmasa@3761 244 }
coleenp@3602 245
coleenp@3602 246 void print_on(outputStream* st) const;
coleenp@3602 247 };
coleenp@3602 248
coleenp@3602 249 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 250 friend class VirtualSpaceList;
coleenp@3602 251
coleenp@3602 252 // Link to next VirtualSpaceNode
coleenp@3602 253 VirtualSpaceNode* _next;
coleenp@3602 254
coleenp@3602 255 // total in the VirtualSpace
coleenp@3602 256 MemRegion _reserved;
coleenp@3602 257 ReservedSpace _rs;
coleenp@3602 258 VirtualSpace _virtual_space;
coleenp@3602 259 MetaWord* _top;
coleenp@3602 260
coleenp@3602 261 // Convenience functions for logical bottom and end
coleenp@3602 262 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 263 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 264
coleenp@3602 265 // Convenience functions to access the _virtual_space
coleenp@3602 266 char* low() const { return virtual_space()->low(); }
coleenp@3602 267 char* high() const { return virtual_space()->high(); }
coleenp@3602 268
coleenp@3602 269 public:
coleenp@3602 270
coleenp@3602 271 VirtualSpaceNode(size_t byte_size);
coleenp@3602 272 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {}
coleenp@3602 273 ~VirtualSpaceNode();
coleenp@3602 274
coleenp@3602 275 // address of next available space in _virtual_space;
coleenp@3602 276 // Accessors
coleenp@3602 277 VirtualSpaceNode* next() { return _next; }
coleenp@3602 278 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 279
coleenp@3602 280 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 281 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 282
coleenp@3602 283 // Accessors
coleenp@3602 284 MemRegion* reserved() { return &_reserved; }
coleenp@3602 285 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 286
coleenp@3602 287 // Returns true if "word_size" is available in the virtual space
coleenp@3602 288 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 289
coleenp@3602 290 MetaWord* top() const { return _top; }
coleenp@3602 291 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 292
coleenp@3602 293 // used and capacity in this single entry in the list
coleenp@3602 294 size_t used_words_in_vs() const;
coleenp@3602 295 size_t capacity_words_in_vs() const;
coleenp@3602 296
coleenp@3602 297 bool initialize();
coleenp@3602 298
coleenp@3602 299 // get space from the virtual space
coleenp@3602 300 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 301
coleenp@3602 302 // Allocate a chunk from the virtual space and return it.
coleenp@3602 303 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 304 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 305
coleenp@3602 306 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 307 // to Virtualspace
coleenp@3602 308 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 309 bool shrink_by(size_t words);
coleenp@3602 310
coleenp@3869 311 #ifdef ASSERT
coleenp@3602 312 // Debug support
coleenp@3602 313 static void verify_virtual_space_total();
coleenp@3602 314 static void verify_virtual_space_count();
coleenp@3602 315 void mangle();
coleenp@3869 316 #endif
coleenp@3602 317
coleenp@3602 318 void print_on(outputStream* st) const;
coleenp@3602 319 };
coleenp@3602 320
coleenp@3602 321 // byte_size is the size of the associated virtualspace.
coleenp@3602 322 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) {
coleenp@3602 323 // This allocates memory with mmap. For DumpSharedspaces, allocate the
coleenp@3602 324 // space at low memory so that other shared images don't conflict.
coleenp@3602 325 // This is the same address as memory needed for UseCompressedOops but
coleenp@3602 326 // compressed oops don't work with CDS (offsets in metadata are wrong), so
coleenp@3602 327 // borrow the same address.
coleenp@3602 328 if (DumpSharedSpaces) {
coleenp@3602 329 char* shared_base = (char*)HeapBaseMinAddress;
coleenp@3602 330 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 331 if (_rs.is_reserved()) {
coleenp@3602 332 assert(_rs.base() == shared_base, "should match");
coleenp@3602 333 } else {
coleenp@3602 334 // If we are dumping the heap, then allocate a wasted block of address
coleenp@3602 335 // space in order to push the heap to a lower address. This extra
coleenp@3602 336 // address range allows for other (or larger) libraries to be loaded
coleenp@3602 337 // without them occupying the space required for the shared spaces.
coleenp@3602 338 uintx reserved = 0;
coleenp@3602 339 uintx block_size = 64*1024*1024;
coleenp@3602 340 while (reserved < SharedDummyBlockSize) {
coleenp@3602 341 char* dummy = os::reserve_memory(block_size);
coleenp@3602 342 reserved += block_size;
coleenp@3602 343 }
coleenp@3602 344 _rs = ReservedSpace(byte_size);
coleenp@3602 345 }
coleenp@3602 346 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 347 } else {
coleenp@3602 348 _rs = ReservedSpace(byte_size);
coleenp@3602 349 }
coleenp@3602 350
coleenp@3602 351 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 352 }
coleenp@3602 353
coleenp@3602 354 // List of VirtualSpaces for metadata allocation.
coleenp@3602 355 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 356 // for total space in the VirtualSpace.
coleenp@3602 357 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 358 friend class VirtualSpaceNode;
coleenp@3602 359
coleenp@3602 360 enum VirtualSpaceSizes {
coleenp@3602 361 VirtualSpaceSize = 256 * K
coleenp@3602 362 };
coleenp@3602 363
coleenp@3602 364 // Global list of virtual spaces
coleenp@3602 365 // Head of the list
coleenp@3602 366 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 367 // virtual space currently being used for allocations
coleenp@3602 368 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 369 // Free chunk list for all other metadata
coleenp@3602 370 ChunkManager _chunk_manager;
coleenp@3602 371
coleenp@3602 372 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 373 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 374 bool _is_class;
coleenp@3602 375 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 376
coleenp@3602 377 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 378 size_t _virtual_space_total;
coleenp@3602 379 size_t _virtual_space_count;
coleenp@3602 380
coleenp@3602 381 ~VirtualSpaceList();
coleenp@3602 382
coleenp@3602 383 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 384
coleenp@3602 385 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 386 _virtual_space_list = v;
coleenp@3602 387 }
coleenp@3602 388 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 389 _current_virtual_space = v;
coleenp@3602 390 }
coleenp@3602 391
coleenp@3602 392 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 393
coleenp@3602 394 // Get another virtual space and add it to the list. This
coleenp@3602 395 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 396 // and is typically followed by the allocation of a chunk.
coleenp@3602 397 bool grow_vs(size_t vs_word_size);
coleenp@3602 398
coleenp@3602 399 public:
coleenp@3602 400 VirtualSpaceList(size_t word_size);
coleenp@3602 401 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 402
coleenp@3602 403 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
coleenp@3602 404
coleenp@3602 405 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 406 return _current_virtual_space;
coleenp@3602 407 }
coleenp@3602 408
coleenp@3602 409 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 410 bool is_class() const { return _is_class; }
coleenp@3602 411
coleenp@3602 412 // Allocate the first virtualspace.
coleenp@3602 413 void initialize(size_t word_size);
coleenp@3602 414
coleenp@3602 415 size_t virtual_space_total() { return _virtual_space_total; }
coleenp@3602 416 void inc_virtual_space_total(size_t v) {
coleenp@3602 417 Atomic::add_ptr(v, &_virtual_space_total);
coleenp@3602 418 }
coleenp@3602 419
coleenp@3602 420 size_t virtual_space_count() { return _virtual_space_count; }
coleenp@3602 421 void inc_virtual_space_count() {
coleenp@3602 422 Atomic::inc_ptr(&_virtual_space_count);
coleenp@3602 423 }
coleenp@3602 424
coleenp@3602 425 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 426 // These are global values shared by all Metaspaces
coleenp@3602 427 size_t capacity_words_sum();
coleenp@3602 428 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 429 size_t used_words_sum();
coleenp@3602 430 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 431
coleenp@3602 432 bool contains(const void *ptr);
coleenp@3602 433
coleenp@3602 434 void print_on(outputStream* st) const;
coleenp@3602 435
coleenp@3602 436 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 437 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 438 public:
coleenp@3602 439 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 440 _virtual_spaces(virtual_spaces) {}
coleenp@3602 441
coleenp@3602 442 bool repeat() {
coleenp@3602 443 return _virtual_spaces != NULL;
coleenp@3602 444 }
coleenp@3602 445
coleenp@3602 446 VirtualSpaceNode* get_next() {
coleenp@3602 447 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 448 if (_virtual_spaces != NULL) {
coleenp@3602 449 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 450 }
coleenp@3602 451 return result;
coleenp@3602 452 }
coleenp@3602 453 };
coleenp@3602 454 };
coleenp@3602 455
coleenp@3602 456 class Metadebug : AllStatic {
coleenp@3602 457 // Debugging support for Metaspaces
coleenp@3602 458 static int _deallocate_block_a_lot_count;
coleenp@3602 459 static int _deallocate_chunk_a_lot_count;
coleenp@3602 460 static int _allocation_fail_alot_count;
coleenp@3602 461
coleenp@3602 462 public:
coleenp@3602 463 static int deallocate_block_a_lot_count() {
coleenp@3602 464 return _deallocate_block_a_lot_count;
coleenp@3602 465 }
coleenp@3602 466 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 467 _deallocate_block_a_lot_count = v;
coleenp@3602 468 }
coleenp@3602 469 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 470 _deallocate_block_a_lot_count++;
coleenp@3602 471 }
coleenp@3602 472 static int deallocate_chunk_a_lot_count() {
coleenp@3602 473 return _deallocate_chunk_a_lot_count;
coleenp@3602 474 }
coleenp@3602 475 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 476 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 477 }
coleenp@3602 478 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 479 _deallocate_chunk_a_lot_count++;
coleenp@3602 480 }
coleenp@3602 481
coleenp@3602 482 static void init_allocation_fail_alot_count();
coleenp@3602 483 #ifdef ASSERT
coleenp@3602 484 static bool test_metadata_failure();
coleenp@3602 485 #endif
coleenp@3602 486
coleenp@3602 487 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 488 size_t chunk_word_size);
coleenp@3602 489 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 490 size_t chunk_word_size);
coleenp@3602 491
coleenp@3602 492 };
coleenp@3602 493
coleenp@3602 494 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 495 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 496 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 497
coleenp@3602 498 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 499 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 500 friend class Metaspace;
coleenp@3602 501 friend class Metadebug;
coleenp@3602 502
coleenp@3602 503 private:
coleenp@3602 504 // protects allocations and contains.
coleenp@3602 505 Mutex* const _lock;
coleenp@3602 506
coleenp@3602 507 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 508 // are done from the current chunk. The list is used for deallocating
coleenp@3602 509 // chunks when the SpaceManager is freed.
jmasa@3761 510 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 511 Metachunk* _current_chunk;
coleenp@3602 512
coleenp@3602 513 // Virtual space where allocation comes from.
coleenp@3602 514 VirtualSpaceList* _vs_list;
coleenp@3602 515
coleenp@3602 516 // Number of small chunks to allocate to a manager
coleenp@3602 517 // If class space manager, small chunks are unlimited
coleenp@3602 518 static uint const _small_chunk_limit;
coleenp@3602 519 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 520
coleenp@3602 521 // Sum of all space in allocated chunks
coleenp@3602 522 size_t _allocation_total;
coleenp@3602 523
coleenp@3602 524 // Free lists of blocks are per SpaceManager since they
coleenp@3602 525 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 526 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 527 // the class loader using the SpaceManager is collected.
coleenp@3602 528 BlockFreelist _block_freelists;
coleenp@3602 529
coleenp@3602 530 // protects virtualspace and chunk expansions
coleenp@3602 531 static const char* _expand_lock_name;
coleenp@3602 532 static const int _expand_lock_rank;
coleenp@3602 533 static Mutex* const _expand_lock;
coleenp@3602 534
coleenp@3602 535 // Accessors
coleenp@3602 536 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 537 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 538
coleenp@3602 539 BlockFreelist* block_freelists() const {
coleenp@3602 540 return (BlockFreelist*) &_block_freelists;
coleenp@3602 541 }
coleenp@3602 542
coleenp@3602 543 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 544
coleenp@3602 545 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 546 void set_current_chunk(Metachunk* v) {
coleenp@3602 547 _current_chunk = v;
coleenp@3602 548 }
coleenp@3602 549
coleenp@3602 550 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 551
coleenp@3602 552 // Add chunk to the list of chunks in use
coleenp@3602 553 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 554
coleenp@3602 555 Mutex* lock() const { return _lock; }
coleenp@3602 556
coleenp@3602 557 public:
coleenp@3602 558 SpaceManager(Mutex* lock, VirtualSpaceList* vs_list);
coleenp@3602 559 ~SpaceManager();
coleenp@3602 560
coleenp@3602 561 enum ChunkSizes { // in words.
coleenp@3602 562 SmallChunk = 512,
coleenp@3602 563 MediumChunk = 8 * K,
coleenp@3602 564 MediumChunkBunch = 4 * MediumChunk
coleenp@3602 565 };
coleenp@3602 566
coleenp@3602 567 // Accessors
coleenp@3602 568 size_t allocation_total() const { return _allocation_total; }
coleenp@3602 569 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); }
coleenp@3602 570 static bool is_humongous(size_t word_size) { return word_size > MediumChunk; }
coleenp@3602 571
coleenp@3602 572 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 573
coleenp@3602 574 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 575 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 576 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 577 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 578 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 579
coleenp@3602 580 size_t sum_count_in_chunks_in_use();
coleenp@3602 581 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 582
coleenp@3602 583 // Block allocation and deallocation.
coleenp@3602 584 // Allocates a block from the current chunk
coleenp@3602 585 MetaWord* allocate(size_t word_size);
coleenp@3602 586
coleenp@3602 587 // Helper for allocations
jmasa@3761 588 MetaWord* allocate_work(size_t word_size);
coleenp@3602 589
coleenp@3602 590 // Returns a block to the per manager freelist
jmasa@3761 591 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 592
coleenp@3602 593 // Based on the allocation size and a minimum chunk size,
coleenp@3602 594 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 595 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 596
coleenp@3602 597 // Called when an allocation from the current chunk fails.
coleenp@3602 598 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 599 // and allocates from that chunk.
jmasa@3761 600 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 601
coleenp@3602 602 // debugging support.
coleenp@3602 603
coleenp@3602 604 void dump(outputStream* const out) const;
coleenp@3602 605 void print_on(outputStream* st) const;
coleenp@3602 606 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 607
coleenp@3602 608 void verify();
jmasa@3892 609 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 610 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 611 #ifdef ASSERT
coleenp@3602 612 void verify_allocation_total();
coleenp@3602 613 #endif
coleenp@3602 614 };
coleenp@3602 615
coleenp@3602 616 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 617
coleenp@3602 618 const char* SpaceManager::_expand_lock_name =
coleenp@3602 619 "SpaceManager chunk allocation lock";
coleenp@3602 620 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 621 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 622 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 623 SpaceManager::_expand_lock_name,
coleenp@3602 624 Mutex::_allow_vm_block_flag);
coleenp@3602 625
coleenp@3602 626 // BlockFreelist methods
coleenp@3602 627
coleenp@3602 628 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 629
coleenp@3602 630 BlockFreelist::~BlockFreelist() {
coleenp@3602 631 if (_dictionary != NULL) {
coleenp@3602 632 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 633 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 634 }
coleenp@3602 635 delete _dictionary;
coleenp@3602 636 }
coleenp@3602 637 }
coleenp@3602 638
jmasa@3761 639 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 640 Metablock* block = (Metablock*) p;
jmasa@3761 641 block->set_word_size(word_size);
jmasa@3761 642 block->set_prev(NULL);
jmasa@3761 643 block->set_next(NULL);
jmasa@3761 644
coleenp@3602 645 return block;
coleenp@3602 646 }
coleenp@3602 647
jmasa@3761 648 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 649 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 650 if (dictionary() == NULL) {
jmasa@3761 651 _dictionary = new BlockTreeDictionary();
coleenp@3602 652 }
jmasa@3761 653 dictionary()->return_chunk(free_chunk);
coleenp@3602 654 }
coleenp@3602 655
jmasa@3761 656 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 657 if (dictionary() == NULL) {
coleenp@3602 658 return NULL;
coleenp@3602 659 }
coleenp@3602 660
jmasa@3761 661 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 662 // Dark matter. Too small for dictionary.
coleenp@3602 663 return NULL;
coleenp@3602 664 }
jmasa@3761 665
jmasa@3761 666 Metablock* free_block =
jmasa@3761 667 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 668 if (free_block == NULL) {
jmasa@3761 669 return NULL;
jmasa@3761 670 }
jmasa@3761 671
jmasa@3761 672 return (MetaWord*) free_block;
coleenp@3602 673 }
coleenp@3602 674
coleenp@3602 675 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 676 if (dictionary() == NULL) {
coleenp@3602 677 return;
coleenp@3602 678 }
coleenp@3602 679 dictionary()->print_free_lists(st);
coleenp@3602 680 }
coleenp@3602 681
coleenp@3602 682 // VirtualSpaceNode methods
coleenp@3602 683
coleenp@3602 684 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 685 _rs.release();
coleenp@3602 686 }
coleenp@3602 687
coleenp@3602 688 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 689 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 690 }
coleenp@3602 691
coleenp@3602 692 // Space committed in the VirtualSpace
coleenp@3602 693 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 694 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 695 }
coleenp@3602 696
coleenp@3602 697
coleenp@3602 698 // Allocates the chunk from the virtual space only.
coleenp@3602 699 // This interface is also used internally for debugging. Not all
coleenp@3602 700 // chunks removed here are necessarily used for allocation.
coleenp@3602 701 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 702 // Bottom of the new chunk
coleenp@3602 703 MetaWord* chunk_limit = top();
coleenp@3602 704 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 705
coleenp@3602 706 if (!is_available(chunk_word_size)) {
coleenp@3602 707 if (TraceMetadataChunkAllocation) {
coleenp@3602 708 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 709 // Dump some information about the virtual space that is nearly full
coleenp@3602 710 print_on(tty);
coleenp@3602 711 }
coleenp@3602 712 return NULL;
coleenp@3602 713 }
coleenp@3602 714
coleenp@3602 715 // Take the space (bump top on the current virtual space).
coleenp@3602 716 inc_top(chunk_word_size);
coleenp@3602 717
coleenp@3602 718 // Point the chunk at the space
coleenp@3602 719 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size);
coleenp@3602 720 return result;
coleenp@3602 721 }
coleenp@3602 722
coleenp@3602 723
coleenp@3602 724 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 725 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 726 size_t bytes = words * BytesPerWord;
coleenp@3602 727 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 728 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 729 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 730 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 731 virtual_space()->print();
coleenp@3602 732 }
coleenp@3602 733 return result;
coleenp@3602 734 }
coleenp@3602 735
coleenp@3602 736 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 737 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 738 size_t bytes = words * BytesPerWord;
coleenp@3602 739 virtual_space()->shrink_by(bytes);
coleenp@3602 740 return true;
coleenp@3602 741 }
coleenp@3602 742
coleenp@3602 743 // Add another chunk to the chunk list.
coleenp@3602 744
coleenp@3602 745 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 746 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 747 Metachunk* result = NULL;
coleenp@3602 748
coleenp@3602 749 return take_from_committed(chunk_word_size);
coleenp@3602 750 }
coleenp@3602 751
coleenp@3602 752 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 753 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 754
coleenp@3602 755 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 756
coleenp@3602 757 if (new_chunk == NULL) {
coleenp@3602 758 // Only a small part of the virtualspace is committed when first
coleenp@3602 759 // allocated so committing more here can be expected.
coleenp@3602 760 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 761 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 762 page_size_words);
coleenp@3602 763 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 764 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 765 }
coleenp@3602 766 return new_chunk;
coleenp@3602 767 }
coleenp@3602 768
coleenp@3602 769 bool VirtualSpaceNode::initialize() {
coleenp@3602 770
coleenp@3602 771 if (!_rs.is_reserved()) {
coleenp@3602 772 return false;
coleenp@3602 773 }
coleenp@3602 774
coleenp@3602 775 // Commit only 1 page instead of the whole reserved space _rs.size()
coleenp@3602 776 size_t committed_byte_size = os::vm_page_size();
coleenp@3602 777 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 778 if (result) {
coleenp@3602 779 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 780 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 781 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 782
coleenp@3603 783 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 784 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 785 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 786 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 787 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 788 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 789 _rs.size() / BytesPerWord));
coleenp@3602 790 }
coleenp@3602 791
coleenp@3602 792 return result;
coleenp@3602 793 }
coleenp@3602 794
coleenp@3602 795 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 796 size_t used = used_words_in_vs();
coleenp@3602 797 size_t capacity = capacity_words_in_vs();
coleenp@3602 798 VirtualSpace* vs = virtual_space();
coleenp@3602 799 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 800 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 801 PTR_FORMAT ", " PTR_FORMAT ")",
coleenp@3602 802 vs, capacity / K, used * 100 / capacity,
coleenp@3602 803 bottom(), top(), end(),
coleenp@3602 804 vs->high_boundary());
coleenp@3602 805 }
coleenp@3602 806
coleenp@3869 807 #ifdef ASSERT
coleenp@3602 808 void VirtualSpaceNode::mangle() {
coleenp@3602 809 size_t word_size = capacity_words_in_vs();
coleenp@3602 810 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 811 }
coleenp@3869 812 #endif // ASSERT
coleenp@3602 813
coleenp@3602 814 // VirtualSpaceList methods
coleenp@3602 815 // Space allocated from the VirtualSpace
coleenp@3602 816
coleenp@3602 817 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 818 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 819 while (iter.repeat()) {
coleenp@3602 820 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 821 delete vsl;
coleenp@3602 822 }
coleenp@3602 823 }
coleenp@3602 824
coleenp@3602 825 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 826 size_t allocated_by_vs = 0;
coleenp@3602 827 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 828 while (iter.repeat()) {
coleenp@3602 829 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 830 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 831 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 832 }
coleenp@3602 833 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 834 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 835 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 836 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 837 size_t used =
coleenp@3602 838 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 839 return used;
coleenp@3602 840 }
coleenp@3602 841
coleenp@3602 842 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 843 // for metadata. This is the upper limit on the capacity
coleenp@3602 844 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 845 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 846 size_t capacity = 0;
coleenp@3602 847 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 848 while (iter.repeat()) {
coleenp@3602 849 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 850 capacity += vsl->capacity_words_in_vs();
coleenp@3602 851 }
coleenp@3602 852 return capacity;
coleenp@3602 853 }
coleenp@3602 854
coleenp@3602 855 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 856 _is_class(false),
coleenp@3602 857 _virtual_space_list(NULL),
coleenp@3602 858 _current_virtual_space(NULL),
coleenp@3602 859 _virtual_space_total(0),
coleenp@3602 860 _virtual_space_count(0) {
coleenp@3602 861 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 862 Mutex::_no_safepoint_check_flag);
coleenp@3602 863 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 864
coleenp@3602 865 assert(initialization_succeeded,
coleenp@3602 866 " VirtualSpaceList initialization should not fail");
coleenp@3602 867 }
coleenp@3602 868
coleenp@3602 869 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 870 _is_class(true),
coleenp@3602 871 _virtual_space_list(NULL),
coleenp@3602 872 _current_virtual_space(NULL),
coleenp@3602 873 _virtual_space_total(0),
coleenp@3602 874 _virtual_space_count(0) {
coleenp@3602 875 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 876 Mutex::_no_safepoint_check_flag);
coleenp@3602 877 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 878 bool succeeded = class_entry->initialize();
coleenp@3602 879 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 880 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 881 }
coleenp@3602 882
coleenp@3602 883 // Allocate another meta virtual space and add it to the list.
coleenp@3602 884 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 885 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 886 if (vs_word_size == 0) {
coleenp@3602 887 return false;
coleenp@3602 888 }
coleenp@3602 889 // Reserve the space
coleenp@3602 890 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 891 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 892
coleenp@3602 893 // Allocate the meta virtual space and initialize it.
coleenp@3602 894 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 895 if (!new_entry->initialize()) {
coleenp@3602 896 delete new_entry;
coleenp@3602 897 return false;
coleenp@3602 898 } else {
coleenp@3860 899 // ensure lock-free iteration sees fully initialized node
coleenp@3860 900 OrderAccess::storestore();
coleenp@3602 901 link_vs(new_entry, vs_word_size);
coleenp@3602 902 return true;
coleenp@3602 903 }
coleenp@3602 904 }
coleenp@3602 905
coleenp@3602 906 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 907 if (virtual_space_list() == NULL) {
coleenp@3602 908 set_virtual_space_list(new_entry);
coleenp@3602 909 } else {
coleenp@3602 910 current_virtual_space()->set_next(new_entry);
coleenp@3602 911 }
coleenp@3602 912 set_current_virtual_space(new_entry);
coleenp@3602 913 inc_virtual_space_total(vs_word_size);
coleenp@3602 914 inc_virtual_space_count();
coleenp@3602 915 #ifdef ASSERT
coleenp@3602 916 new_entry->mangle();
coleenp@3602 917 #endif
coleenp@3602 918 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 919 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 920 vsl->print_on(tty);
coleenp@3602 921 }
coleenp@3602 922 }
coleenp@3602 923
coleenp@3602 924 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
coleenp@3602 925 size_t grow_chunks_by_words) {
coleenp@3602 926
coleenp@3602 927 // Get a chunk from the chunk freelist
coleenp@3602 928 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 929
coleenp@3602 930 // Allocate a chunk out of the current virtual space.
coleenp@3602 931 if (next == NULL) {
coleenp@3602 932 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 933 }
coleenp@3602 934
coleenp@3602 935 if (next == NULL) {
coleenp@3602 936 // Not enough room in current virtual space. Try to commit
coleenp@3602 937 // more space.
coleenp@3602 938 size_t expand_vs_by_words = MAX2((size_t)SpaceManager::MediumChunkBunch,
coleenp@3602 939 grow_chunks_by_words);
coleenp@3602 940 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 941 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 942 page_size_words);
coleenp@3602 943 bool vs_expanded =
coleenp@3602 944 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 945 if (!vs_expanded) {
coleenp@3602 946 // Should the capacity of the metaspaces be expanded for
coleenp@3602 947 // this allocation? If it's the virtual space for classes and is
coleenp@3602 948 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 949 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 950 // Get another virtual space.
coleenp@3602 951 size_t grow_vs_words =
coleenp@3602 952 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 953 if (grow_vs(grow_vs_words)) {
coleenp@3602 954 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 955 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 956 }
coleenp@3602 957 if (TraceMetadataHumongousAllocation && SpaceManager::is_humongous(word_size)) {
coleenp@3602 958 gclog_or_tty->print_cr(" aligned_expand_vs_by_words " PTR_FORMAT,
coleenp@3602 959 aligned_expand_vs_by_words);
coleenp@3602 960 gclog_or_tty->print_cr(" grow_vs_words " PTR_FORMAT,
coleenp@3602 961 grow_vs_words);
coleenp@3602 962 }
coleenp@3602 963 } else {
coleenp@3602 964 // Allocation will fail and induce a GC
coleenp@3602 965 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 966 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 967 " Fail instead of expand the metaspace");
coleenp@3602 968 }
coleenp@3602 969 }
coleenp@3602 970 } else {
coleenp@3602 971 // The virtual space expanded, get a new chunk
coleenp@3602 972 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 973 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 974 }
coleenp@3602 975 }
coleenp@3602 976
coleenp@3602 977 return next;
coleenp@3602 978 }
coleenp@3602 979
coleenp@3602 980 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 981 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 982 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 983 while (iter.repeat()) {
coleenp@3602 984 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 985 node->print_on(st);
coleenp@3602 986 }
coleenp@3602 987 }
coleenp@3602 988 }
coleenp@3602 989
coleenp@3602 990 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 991 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 992 VirtualSpaceListIterator iter(list);
coleenp@3602 993 while (iter.repeat()) {
coleenp@3602 994 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 995 if (node->reserved()->contains(ptr)) {
coleenp@3602 996 return true;
coleenp@3602 997 }
coleenp@3602 998 }
coleenp@3602 999 return false;
coleenp@3602 1000 }
coleenp@3602 1001
coleenp@3602 1002
coleenp@3602 1003 // MetaspaceGC methods
coleenp@3602 1004
coleenp@3602 1005 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1006 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1007 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1008 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1009 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1010 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1011 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1012 //
coleenp@3602 1013 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1014 // resize the capacity of the metaspaces. The current implementation
coleenp@3602 1015 // is based on the flags MinHeapFreeRatio and MaxHeapFreeRatio used
coleenp@3602 1016 // to resize the Java heap by some GC's. New flags can be implemented
coleenp@3602 1017 // if really needed. MinHeapFreeRatio is used to calculate how much
coleenp@3602 1018 // free space is desirable in the metaspace capacity to decide how much
coleenp@3602 1019 // to increase the HWM. MaxHeapFreeRatio is used to decide how much
coleenp@3602 1020 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1021 // the HWM.
coleenp@3602 1022
coleenp@3602 1023 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1024 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1025 // another expansion is not requested too soon. If that is not
coleenp@3602 1026 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1027 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1028 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1029 // some.
coleenp@3602 1030 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1031 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1032 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1033 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1034 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1035 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1036 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1037 if (delta_words > min_delta_words) {
coleenp@3602 1038 // Don't want to hit the high water mark on the next
coleenp@3602 1039 // allocation so make the delta greater than just enough
coleenp@3602 1040 // for this allocation.
coleenp@3602 1041 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1042 if (delta_words > max_delta_words) {
coleenp@3602 1043 // This allocation is large but the next ones are probably not
coleenp@3602 1044 // so increase by the minimum.
coleenp@3602 1045 delta_words = delta_words + min_delta_words;
coleenp@3602 1046 }
coleenp@3602 1047 }
coleenp@3602 1048 return delta_words;
coleenp@3602 1049 }
coleenp@3602 1050
coleenp@3602 1051 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
coleenp@3602 1052
coleenp@3602 1053 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1054 // metadata virtual space.
coleenp@3602 1055 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1056
coleenp@3602 1057 // If the user wants a limit, impose one.
coleenp@3602 1058 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord;
coleenp@3602 1059 size_t metaspace_size_words = MetaspaceSize / BytesPerWord;
coleenp@3602 1060 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
coleenp@3602 1061 vsl->capacity_words_sum() >= max_metaspace_size_words) {
coleenp@3602 1062 return false;
coleenp@3602 1063 }
coleenp@3602 1064
coleenp@3602 1065 // If this is part of an allocation after a GC, expand
coleenp@3602 1066 // unconditionally.
coleenp@3602 1067 if(MetaspaceGC::expand_after_GC()) {
coleenp@3602 1068 return true;
coleenp@3602 1069 }
coleenp@3602 1070
coleenp@3602 1071 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1072 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1073 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1074 // until that minimum capacity is exceeded.
coleenp@3602 1075 if (vsl->capacity_words_sum() < metaspace_size_words ||
coleenp@3602 1076 capacity_until_GC() == 0) {
coleenp@3602 1077 set_capacity_until_GC(metaspace_size_words);
coleenp@3602 1078 return true;
coleenp@3602 1079 } else {
coleenp@3602 1080 if (vsl->capacity_words_sum() < capacity_until_GC()) {
coleenp@3602 1081 return true;
coleenp@3602 1082 } else {
coleenp@3602 1083 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1084 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1085 " capacity_until_GC " SIZE_FORMAT
coleenp@3602 1086 " capacity_words_sum " SIZE_FORMAT
coleenp@3602 1087 " used_words_sum " SIZE_FORMAT
coleenp@3602 1088 " free chunks " SIZE_FORMAT
coleenp@3602 1089 " free chunks count %d",
coleenp@3602 1090 word_size,
coleenp@3602 1091 capacity_until_GC(),
coleenp@3602 1092 vsl->capacity_words_sum(),
coleenp@3602 1093 vsl->used_words_sum(),
coleenp@3602 1094 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1095 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1096 }
coleenp@3602 1097 return false;
coleenp@3602 1098 }
coleenp@3602 1099 }
coleenp@3602 1100 }
coleenp@3602 1101
coleenp@3602 1102 // Variables are in bytes
coleenp@3602 1103
coleenp@3602 1104 void MetaspaceGC::compute_new_size() {
coleenp@3602 1105 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1106 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1107 _shrink_factor = 0;
coleenp@3602 1108
coleenp@3602 1109 VirtualSpaceList *vsl = Metaspace::space_list();
coleenp@3602 1110
coleenp@3602 1111 size_t capacity_after_gc = vsl->capacity_bytes_sum();
coleenp@3602 1112 // Check to see if these two can be calculated without walking the CLDG
coleenp@3602 1113 size_t used_after_gc = vsl->used_bytes_sum();
coleenp@3602 1114 size_t capacity_until_GC = vsl->capacity_bytes_sum();
coleenp@3602 1115 size_t free_after_gc = capacity_until_GC - used_after_gc;
coleenp@3602 1116
coleenp@3602 1117 const double minimum_free_percentage = MinHeapFreeRatio / 100.0;
coleenp@3602 1118 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1119
coleenp@3602 1120 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1121 size_t minimum_desired_capacity =
coleenp@3602 1122 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1123 // Don't shrink less than the initial generation size
coleenp@3602 1124 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1125 MetaspaceSize);
coleenp@3602 1126
coleenp@3602 1127 if (PrintGCDetails && Verbose) {
coleenp@3602 1128 const double free_percentage = ((double)free_after_gc) / capacity_until_GC;
coleenp@3602 1129 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1130 gclog_or_tty->print_cr(" "
coleenp@3602 1131 " minimum_free_percentage: %6.2f"
coleenp@3602 1132 " maximum_used_percentage: %6.2f",
coleenp@3602 1133 minimum_free_percentage,
coleenp@3602 1134 maximum_used_percentage);
coleenp@3602 1135 double d_free_after_gc = free_after_gc / (double) K;
coleenp@3602 1136 gclog_or_tty->print_cr(" "
coleenp@3602 1137 " free_after_gc : %6.1fK"
coleenp@3602 1138 " used_after_gc : %6.1fK"
coleenp@3602 1139 " capacity_after_gc : %6.1fK"
coleenp@3602 1140 " metaspace HWM : %6.1fK",
coleenp@3602 1141 free_after_gc / (double) K,
coleenp@3602 1142 used_after_gc / (double) K,
coleenp@3602 1143 capacity_after_gc / (double) K,
coleenp@3602 1144 capacity_until_GC / (double) K);
coleenp@3602 1145 gclog_or_tty->print_cr(" "
coleenp@3602 1146 " free_percentage: %6.2f",
coleenp@3602 1147 free_percentage);
coleenp@3602 1148 }
coleenp@3602 1149
coleenp@3602 1150
coleenp@3602 1151 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1152 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1153 // increment the HWM.
coleenp@3602 1154 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1155 // Don't expand unless it's significant
coleenp@3602 1156 if (expand_bytes >= MinMetaspaceExpansion) {
coleenp@3602 1157 size_t expand_words = expand_bytes / BytesPerWord;
coleenp@3602 1158 MetaspaceGC::inc_capacity_until_GC(expand_words);
coleenp@3602 1159 }
coleenp@3602 1160 if (PrintGCDetails && Verbose) {
coleenp@3602 1161 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1162 gclog_or_tty->print_cr(" expanding:"
coleenp@3602 1163 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1164 " expand_words: %6.1fK"
coleenp@3602 1165 " MinMetaspaceExpansion: %6.1fK"
coleenp@3602 1166 " new metaspace HWM: %6.1fK",
coleenp@3602 1167 minimum_desired_capacity / (double) K,
coleenp@3602 1168 expand_bytes / (double) K,
coleenp@3602 1169 MinMetaspaceExpansion / (double) K,
coleenp@3602 1170 new_capacity_until_GC / (double) K);
coleenp@3602 1171 }
coleenp@3602 1172 return;
coleenp@3602 1173 }
coleenp@3602 1174
coleenp@3602 1175 // No expansion, now see if we want to shrink
coleenp@3602 1176 size_t shrink_words = 0;
coleenp@3602 1177 // We would never want to shrink more than this
coleenp@3602 1178 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity;
coleenp@3602 1179 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT,
coleenp@3602 1180 max_shrink_words));
coleenp@3602 1181
coleenp@3602 1182 // Should shrinking be considered?
coleenp@3602 1183 if (MaxHeapFreeRatio < 100) {
coleenp@3602 1184 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0;
coleenp@3602 1185 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1186 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1187 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1188 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1189 MetaspaceSize);
coleenp@3602 1190 if (PrintGC && Verbose) {
coleenp@3602 1191 gclog_or_tty->print_cr(" "
coleenp@3602 1192 " maximum_free_percentage: %6.2f"
coleenp@3602 1193 " minimum_used_percentage: %6.2f",
coleenp@3602 1194 maximum_free_percentage,
coleenp@3602 1195 minimum_used_percentage);
coleenp@3602 1196 gclog_or_tty->print_cr(" "
coleenp@3602 1197 " capacity_until_GC: %6.1fK"
coleenp@3602 1198 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1199 " maximum_desired_capacity: %6.1fK",
coleenp@3602 1200 capacity_until_GC / (double) K,
coleenp@3602 1201 minimum_desired_capacity / (double) K,
coleenp@3602 1202 maximum_desired_capacity / (double) K);
coleenp@3602 1203 }
coleenp@3602 1204
coleenp@3602 1205 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1206 "sanity check");
coleenp@3602 1207
coleenp@3602 1208 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1209 // Capacity too large, compute shrinking size
coleenp@3602 1210 shrink_words = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1211 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1212 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1213 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1214 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1215 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1216 // size without shrinking, it goes back to 0%.
coleenp@3602 1217 shrink_words = shrink_words / 100 * current_shrink_factor;
coleenp@3602 1218 assert(shrink_words <= max_shrink_words,
coleenp@3602 1219 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
coleenp@3602 1220 shrink_words, max_shrink_words));
coleenp@3602 1221 if (current_shrink_factor == 0) {
coleenp@3602 1222 _shrink_factor = 10;
coleenp@3602 1223 } else {
coleenp@3602 1224 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1225 }
coleenp@3602 1226 if (PrintGCDetails && Verbose) {
coleenp@3602 1227 gclog_or_tty->print_cr(" "
coleenp@3602 1228 " shrinking:"
coleenp@3602 1229 " initSize: %.1fK"
coleenp@3602 1230 " maximum_desired_capacity: %.1fK",
coleenp@3602 1231 MetaspaceSize / (double) K,
coleenp@3602 1232 maximum_desired_capacity / (double) K);
coleenp@3602 1233 gclog_or_tty->print_cr(" "
coleenp@3602 1234 " shrink_words: %.1fK"
coleenp@3602 1235 " current_shrink_factor: %d"
coleenp@3602 1236 " new shrink factor: %d"
coleenp@3602 1237 " MinMetaspaceExpansion: %.1fK",
coleenp@3602 1238 shrink_words / (double) K,
coleenp@3602 1239 current_shrink_factor,
coleenp@3602 1240 _shrink_factor,
coleenp@3602 1241 MinMetaspaceExpansion / (double) K);
coleenp@3602 1242 }
coleenp@3602 1243 }
coleenp@3602 1244 }
coleenp@3602 1245
coleenp@3602 1246
coleenp@3602 1247 // Don't shrink unless it's significant
coleenp@3602 1248 if (shrink_words >= MinMetaspaceExpansion) {
coleenp@3602 1249 VirtualSpaceNode* csp = vsl->current_virtual_space();
coleenp@3602 1250 size_t available_to_shrink = csp->capacity_words_in_vs() -
coleenp@3602 1251 csp->used_words_in_vs();
coleenp@3602 1252 shrink_words = MIN2(shrink_words, available_to_shrink);
coleenp@3602 1253 csp->shrink_by(shrink_words);
coleenp@3602 1254 MetaspaceGC::dec_capacity_until_GC(shrink_words);
coleenp@3602 1255 if (PrintGCDetails && Verbose) {
coleenp@3602 1256 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1257 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K);
coleenp@3602 1258 }
coleenp@3602 1259 }
coleenp@3602 1260 assert(vsl->used_bytes_sum() == used_after_gc &&
coleenp@3602 1261 used_after_gc <= vsl->capacity_bytes_sum(),
coleenp@3602 1262 "sanity check");
coleenp@3602 1263
coleenp@3602 1264 }
coleenp@3602 1265
coleenp@3602 1266 // Metadebug methods
coleenp@3602 1267
coleenp@3602 1268 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1269 size_t chunk_word_size){
coleenp@3602 1270 #ifdef ASSERT
coleenp@3602 1271 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1272 if (MetaDataDeallocateALot &&
coleenp@3602 1273 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1274 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1275 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1276 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1277 if (dummy_chunk == NULL) {
coleenp@3602 1278 break;
coleenp@3602 1279 }
coleenp@3602 1280 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1281
coleenp@3602 1282 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1283 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1284 sm->sum_count_in_chunks_in_use());
coleenp@3602 1285 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1286 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1287 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1288 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1289 }
coleenp@3602 1290 }
coleenp@3602 1291 } else {
coleenp@3602 1292 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1293 }
coleenp@3602 1294 #endif
coleenp@3602 1295 }
coleenp@3602 1296
coleenp@3602 1297 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1298 size_t raw_word_size){
coleenp@3602 1299 #ifdef ASSERT
coleenp@3602 1300 if (MetaDataDeallocateALot &&
coleenp@3602 1301 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1302 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1303 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1304 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1305 if (dummy_block == 0) {
coleenp@3602 1306 break;
coleenp@3602 1307 }
jmasa@3761 1308 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1309 }
coleenp@3602 1310 } else {
coleenp@3602 1311 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1312 }
coleenp@3602 1313 #endif
coleenp@3602 1314 }
coleenp@3602 1315
coleenp@3602 1316 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1317 if (MetadataAllocationFailALot) {
coleenp@3602 1318 _allocation_fail_alot_count =
coleenp@3602 1319 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1320 }
coleenp@3602 1321 }
coleenp@3602 1322
coleenp@3602 1323 #ifdef ASSERT
coleenp@3602 1324 bool Metadebug::test_metadata_failure() {
coleenp@3602 1325 if (MetadataAllocationFailALot &&
coleenp@3602 1326 Threads::is_vm_complete()) {
coleenp@3602 1327 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1328 _allocation_fail_alot_count--;
coleenp@3602 1329 } else {
coleenp@3602 1330 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1331 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1332 "MetadataAllocationFailALot");
coleenp@3602 1333 }
coleenp@3602 1334 init_allocation_fail_alot_count();
coleenp@3602 1335 return true;
coleenp@3602 1336 }
coleenp@3602 1337 }
coleenp@3602 1338 return false;
coleenp@3602 1339 }
coleenp@3602 1340 #endif
coleenp@3602 1341
coleenp@3602 1342 // ChunkList methods
coleenp@3602 1343
coleenp@3602 1344 size_t ChunkList::sum_list_size() {
coleenp@3602 1345 size_t result = 0;
coleenp@3602 1346 Metachunk* cur = head();
coleenp@3602 1347 while (cur != NULL) {
coleenp@3602 1348 result += cur->word_size();
coleenp@3602 1349 cur = cur->next();
coleenp@3602 1350 }
coleenp@3602 1351 return result;
coleenp@3602 1352 }
coleenp@3602 1353
coleenp@3602 1354 size_t ChunkList::sum_list_count() {
coleenp@3602 1355 size_t result = 0;
coleenp@3602 1356 Metachunk* cur = head();
coleenp@3602 1357 while (cur != NULL) {
coleenp@3602 1358 result++;
coleenp@3602 1359 cur = cur->next();
coleenp@3602 1360 }
coleenp@3602 1361 return result;
coleenp@3602 1362 }
coleenp@3602 1363
coleenp@3602 1364 size_t ChunkList::sum_list_capacity() {
coleenp@3602 1365 size_t result = 0;
coleenp@3602 1366 Metachunk* cur = head();
coleenp@3602 1367 while (cur != NULL) {
coleenp@3602 1368 result += cur->capacity_word_size();
coleenp@3602 1369 cur = cur->next();
coleenp@3602 1370 }
coleenp@3602 1371 return result;
coleenp@3602 1372 }
coleenp@3602 1373
coleenp@3602 1374 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) {
coleenp@3602 1375 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1376 assert(tail->next() == NULL, "Not the tail");
coleenp@3602 1377
coleenp@3602 1378 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1379 tty->print("ChunkList::add_at_head: ");
coleenp@3602 1380 Metachunk* cur = head;
coleenp@3602 1381 while (cur != NULL) {
coleenp@3602 1382 tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size());
coleenp@3602 1383 cur = cur->next();
coleenp@3602 1384 }
coleenp@3602 1385 tty->print_cr("");
coleenp@3602 1386 }
coleenp@3602 1387
coleenp@3602 1388 if (tail != NULL) {
coleenp@3602 1389 tail->set_next(_head);
coleenp@3602 1390 }
coleenp@3602 1391 set_head(head);
coleenp@3602 1392 }
coleenp@3602 1393
coleenp@3602 1394 void ChunkList::add_at_head(Metachunk* list) {
coleenp@3602 1395 if (list == NULL) {
coleenp@3602 1396 // Nothing to add
coleenp@3602 1397 return;
coleenp@3602 1398 }
coleenp@3602 1399 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1400 Metachunk* head = list;
coleenp@3602 1401 Metachunk* tail = list;
coleenp@3602 1402 Metachunk* cur = head->next();
coleenp@3602 1403 // Search for the tail since it is not passed.
coleenp@3602 1404 while (cur != NULL) {
coleenp@3602 1405 tail = cur;
coleenp@3602 1406 cur = cur->next();
coleenp@3602 1407 }
coleenp@3602 1408 add_at_head(head, tail);
coleenp@3602 1409 }
coleenp@3602 1410
coleenp@3602 1411 // ChunkManager methods
coleenp@3602 1412
coleenp@3602 1413 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1414 // work with the CMS collector because its use of additional locks
coleenp@3602 1415 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1416 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1417
coleenp@3602 1418 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1419 #ifdef ASSERT
coleenp@3602 1420 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1421 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1422 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1423 slow_locked_verify_free_chunks_total();
coleenp@3602 1424 }
coleenp@3602 1425 #endif
coleenp@3602 1426 return _free_chunks_total;
coleenp@3602 1427 }
coleenp@3602 1428
coleenp@3602 1429 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1430 return free_chunks_total() * BytesPerWord;
coleenp@3602 1431 }
coleenp@3602 1432
coleenp@3602 1433 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1434 #ifdef ASSERT
coleenp@3602 1435 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1436 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1437 Mutex::_no_safepoint_check_flag);
coleenp@3602 1438 // This lock is only needed in debug because the verification
coleenp@3602 1439 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1440 slow_locked_verify_free_chunks_count();
coleenp@3602 1441 }
coleenp@3602 1442 #endif
mgerdin@3829 1443 return _free_chunks_count;
coleenp@3602 1444 }
coleenp@3602 1445
coleenp@3602 1446 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1447 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1448 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1449 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1450 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1451 sum_free_chunks()));
coleenp@3602 1452 }
coleenp@3602 1453
coleenp@3602 1454 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1455 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1456 Mutex::_no_safepoint_check_flag);
coleenp@3602 1457 locked_verify_free_chunks_total();
coleenp@3602 1458 }
coleenp@3602 1459
coleenp@3602 1460 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1461 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1462 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1463 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1464 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1465 sum_free_chunks_count()));
coleenp@3602 1466 }
coleenp@3602 1467
coleenp@3602 1468 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1469 #ifdef ASSERT
coleenp@3602 1470 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1471 Mutex::_no_safepoint_check_flag);
coleenp@3602 1472 locked_verify_free_chunks_count();
coleenp@3602 1473 #endif
coleenp@3602 1474 }
coleenp@3602 1475
coleenp@3602 1476 void ChunkManager::verify() {
mgerdin@3829 1477 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1478 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1479 locked_verify();
coleenp@3602 1480 }
coleenp@3602 1481
coleenp@3602 1482 void ChunkManager::locked_verify() {
jmasa@3761 1483 locked_verify_free_chunks_count();
coleenp@3602 1484 locked_verify_free_chunks_total();
coleenp@3602 1485 }
coleenp@3602 1486
coleenp@3602 1487 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1488 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1489 st->print_cr("Free chunk total 0x%x count 0x%x",
coleenp@3602 1490 _free_chunks_total, _free_chunks_count);
coleenp@3602 1491 }
coleenp@3602 1492
coleenp@3602 1493 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1494 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1495 st->print_cr("Sum free chunk total 0x%x count 0x%x",
coleenp@3602 1496 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1497 }
coleenp@3602 1498 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1499 return &_free_chunks[index];
coleenp@3602 1500 }
coleenp@3602 1501
coleenp@3602 1502 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1503 // methods that are used in product builds.
coleenp@3602 1504 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1505 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1506 size_t result = 0;
coleenp@3602 1507 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1508 ChunkList* list = free_chunks(i);
coleenp@3602 1509
coleenp@3602 1510 if (list == NULL) {
coleenp@3602 1511 continue;
coleenp@3602 1512 }
coleenp@3602 1513
coleenp@3602 1514 result = result + list->sum_list_capacity();
coleenp@3602 1515 }
jmasa@3761 1516 result = result + humongous_dictionary()->total_size();
coleenp@3602 1517 return result;
coleenp@3602 1518 }
coleenp@3602 1519
coleenp@3602 1520 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1521 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1522 size_t count = 0;
coleenp@3602 1523 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1524 ChunkList* list = free_chunks(i);
coleenp@3602 1525 if (list == NULL) {
coleenp@3602 1526 continue;
coleenp@3602 1527 }
coleenp@3602 1528 count = count + list->sum_list_count();
coleenp@3602 1529 }
jmasa@3761 1530 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1531 return count;
coleenp@3602 1532 }
coleenp@3602 1533
coleenp@3602 1534 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
coleenp@3602 1535 switch (word_size) {
coleenp@3602 1536 case SpaceManager::SmallChunk :
coleenp@3602 1537 return &_free_chunks[0];
coleenp@3602 1538 case SpaceManager::MediumChunk :
coleenp@3602 1539 return &_free_chunks[1];
coleenp@3602 1540 default:
coleenp@3602 1541 assert(word_size > SpaceManager::MediumChunk, "List inconsistency");
coleenp@3602 1542 return &_free_chunks[2];
coleenp@3602 1543 }
coleenp@3602 1544 }
coleenp@3602 1545
coleenp@3602 1546 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1547 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1548 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1549 chunk->set_next(free_list->head());
coleenp@3602 1550 free_list->set_head(chunk);
coleenp@3602 1551 // chunk is being returned to the chunk free list
coleenp@3602 1552 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1553 slow_locked_verify();
coleenp@3602 1554 }
coleenp@3602 1555
coleenp@3602 1556 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1557 // The deallocation of a chunk originates in the freelist
coleenp@3602 1558 // manangement code for a Metaspace and does not hold the
coleenp@3602 1559 // lock.
coleenp@3602 1560 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1561 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1562 slow_locked_verify();
coleenp@3602 1563 if (TraceMetadataChunkAllocation) {
coleenp@3602 1564 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1565 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1566 chunk, chunk->word_size());
coleenp@3602 1567 }
coleenp@3602 1568 free_chunks_put(chunk);
coleenp@3602 1569 }
coleenp@3602 1570
coleenp@3602 1571 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1572 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1573
mgerdin@3829 1574 slow_locked_verify();
jmasa@3761 1575
jmasa@3761 1576 Metachunk* chunk = NULL;
jmasa@3761 1577 if (!SpaceManager::is_humongous(word_size)) {
jmasa@3761 1578 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1579 assert(free_list != NULL, "Sanity check");
jmasa@3761 1580
jmasa@3761 1581 chunk = free_list->head();
jmasa@3761 1582 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1583
jmasa@3761 1584 if (chunk == NULL) {
jmasa@3761 1585 return NULL;
jmasa@3761 1586 }
jmasa@3761 1587
coleenp@3602 1588 // Remove the chunk as the head of the list.
coleenp@3602 1589 free_list->set_head(chunk->next());
coleenp@3602 1590 chunk->set_next(NULL);
jmasa@3761 1591 // Chunk has been removed from the chunks free list.
jmasa@3761 1592 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1593
coleenp@3602 1594 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1595 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1596 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1597 free_list, chunk, chunk->word_size());
coleenp@3602 1598 }
coleenp@3602 1599 } else {
jmasa@3761 1600 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1601 word_size,
jmasa@3761 1602 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1603
jmasa@3761 1604 if (chunk != NULL) {
jmasa@3761 1605 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1606 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1607 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1608 " for requested size " SIZE_FORMAT
jmasa@3761 1609 " waste " SIZE_FORMAT,
jmasa@3761 1610 chunk->word_size(), word_size, waste);
coleenp@3602 1611 }
jmasa@3761 1612 // Chunk is being removed from the chunks free list.
jmasa@3761 1613 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3761 1614 #ifdef ASSERT
jmasa@3761 1615 chunk->set_is_free(false);
jmasa@3761 1616 #endif
coleenp@3602 1617 }
coleenp@3602 1618 }
mgerdin@3829 1619 slow_locked_verify();
coleenp@3602 1620 return chunk;
coleenp@3602 1621 }
coleenp@3602 1622
coleenp@3602 1623 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1624 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1625 slow_locked_verify();
coleenp@3602 1626
coleenp@3602 1627 // Take from the beginning of the list
coleenp@3602 1628 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1629 if (chunk == NULL) {
coleenp@3602 1630 return NULL;
coleenp@3602 1631 }
coleenp@3602 1632
coleenp@3602 1633 assert(word_size <= chunk->word_size() ||
coleenp@3602 1634 SpaceManager::is_humongous(chunk->word_size()),
coleenp@3602 1635 "Non-humongous variable sized chunk");
coleenp@3602 1636 if (TraceMetadataChunkAllocation) {
coleenp@3602 1637 tty->print("ChunkManager::chunk_freelist_allocate: chunk "
coleenp@3602 1638 PTR_FORMAT " size " SIZE_FORMAT " ",
coleenp@3602 1639 chunk, chunk->word_size());
coleenp@3602 1640 locked_print_free_chunks(tty);
coleenp@3602 1641 }
coleenp@3602 1642
coleenp@3602 1643 return chunk;
coleenp@3602 1644 }
coleenp@3602 1645
jmasa@3761 1646 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1647 if (PrintFLSStatistics != 0) {
jmasa@3761 1648 humongous_dictionary()->report_statistics();
jmasa@3761 1649 }
jmasa@3761 1650 }
jmasa@3761 1651
coleenp@3602 1652 // SpaceManager methods
coleenp@3602 1653
coleenp@3602 1654 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1655 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1656 size_t free = 0;
jmasa@3761 1657 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1658 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1659 while (chunk != NULL) {
coleenp@3602 1660 free += chunk->free_word_size();
coleenp@3602 1661 chunk = chunk->next();
coleenp@3602 1662 }
coleenp@3602 1663 }
coleenp@3602 1664 return free;
coleenp@3602 1665 }
coleenp@3602 1666
coleenp@3602 1667 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1668 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1669 size_t result = 0;
jmasa@3761 1670 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3761 1671
jmasa@3761 1672
coleenp@3602 1673 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1674 }
jmasa@3761 1675
coleenp@3602 1676 return result;
coleenp@3602 1677 }
coleenp@3602 1678
coleenp@3602 1679 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1680 size_t result = 0;
coleenp@3602 1681 size_t count = 0;
coleenp@3602 1682 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1683 // Count the free space in all the chunk but not the
coleenp@3602 1684 // current chunk from which allocations are still being done.
coleenp@3602 1685 if (chunk != NULL) {
jmasa@3761 1686 Metachunk* prev = chunk;
jmasa@3761 1687 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1688 result += chunk->free_word_size();
jmasa@3761 1689 prev = chunk;
coleenp@3602 1690 chunk = chunk->next();
coleenp@3602 1691 count++;
coleenp@3602 1692 }
coleenp@3602 1693 }
coleenp@3602 1694 return result;
coleenp@3602 1695 }
coleenp@3602 1696
coleenp@3602 1697 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
coleenp@3602 1698 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1699 size_t sum = 0;
jmasa@3761 1700 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1701 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1702 while (chunk != NULL) {
coleenp@3602 1703 // Just changed this sum += chunk->capacity_word_size();
coleenp@3602 1704 // sum += chunk->word_size() - Metachunk::overhead();
coleenp@3602 1705 sum += chunk->capacity_word_size();
coleenp@3602 1706 chunk = chunk->next();
coleenp@3602 1707 }
coleenp@3602 1708 }
coleenp@3602 1709 return sum;
coleenp@3602 1710 }
coleenp@3602 1711
coleenp@3602 1712 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1713 size_t count = 0;
jmasa@3761 1714 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1715 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1716 }
jmasa@3761 1717
coleenp@3602 1718 return count;
coleenp@3602 1719 }
coleenp@3602 1720
coleenp@3602 1721 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1722 size_t count = 0;
coleenp@3602 1723 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1724 while (chunk != NULL) {
coleenp@3602 1725 count++;
coleenp@3602 1726 chunk = chunk->next();
coleenp@3602 1727 }
coleenp@3602 1728 return count;
coleenp@3602 1729 }
coleenp@3602 1730
coleenp@3602 1731
coleenp@3602 1732 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1733 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1734 size_t used = 0;
jmasa@3761 1735 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1736 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1737 while (chunk != NULL) {
coleenp@3602 1738 used += chunk->used_word_size();
coleenp@3602 1739 chunk = chunk->next();
coleenp@3602 1740 }
coleenp@3602 1741 }
coleenp@3602 1742 return used;
coleenp@3602 1743 }
coleenp@3602 1744
coleenp@3602 1745 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1746
coleenp@3602 1747 Metachunk* small_chunk = chunks_in_use(SmallIndex);
coleenp@3602 1748 st->print_cr("SpaceManager: small chunk " PTR_FORMAT
coleenp@3602 1749 " free " SIZE_FORMAT,
coleenp@3602 1750 small_chunk,
coleenp@3602 1751 small_chunk->free_word_size());
coleenp@3602 1752
coleenp@3602 1753 Metachunk* medium_chunk = chunks_in_use(MediumIndex);
coleenp@3602 1754 st->print("medium chunk " PTR_FORMAT, medium_chunk);
coleenp@3602 1755 Metachunk* tail = current_chunk();
coleenp@3602 1756 st->print_cr(" current chunk " PTR_FORMAT, tail);
coleenp@3602 1757
coleenp@3602 1758 Metachunk* head = chunks_in_use(HumongousIndex);
coleenp@3602 1759 st->print_cr("humongous chunk " PTR_FORMAT, head);
coleenp@3602 1760
coleenp@3602 1761 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1762 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1763 }
coleenp@3602 1764
coleenp@3602 1765 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1766
coleenp@3602 1767 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1768 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1769 // once a medium chunk has been allocated, no more small
coleenp@3602 1770 // chunks will be allocated.
coleenp@3602 1771 size_t chunk_word_size;
coleenp@3602 1772 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1773 (!has_small_chunk_limit() ||
coleenp@3602 1774 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
coleenp@3602 1775 chunk_word_size = (size_t) SpaceManager::SmallChunk;
coleenp@3602 1776 if (word_size + Metachunk::overhead() > SpaceManager::SmallChunk) {
coleenp@3602 1777 chunk_word_size = MediumChunk;
coleenp@3602 1778 }
coleenp@3602 1779 } else {
coleenp@3602 1780 chunk_word_size = MediumChunk;
coleenp@3602 1781 }
coleenp@3602 1782
coleenp@3602 1783 // Might still need a humongous chunk
coleenp@3602 1784 chunk_word_size =
coleenp@3602 1785 MAX2((size_t) chunk_word_size, word_size + Metachunk::overhead());
coleenp@3602 1786
coleenp@3602 1787 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1788 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1789 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1790 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1791 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1792 chunk_word_size);
jmasa@3761 1793 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1794 Metachunk::overhead());
coleenp@3602 1795 }
coleenp@3602 1796 return chunk_word_size;
coleenp@3602 1797 }
coleenp@3602 1798
jmasa@3761 1799 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1800 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1801 "Should have been set");
coleenp@3602 1802 assert(current_chunk() == NULL ||
coleenp@3602 1803 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1804 "Don't need to expand");
coleenp@3602 1805 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1806
coleenp@3602 1807 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1808 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
coleenp@3602 1809 " words " SIZE_FORMAT " space left",
coleenp@3602 1810 word_size, current_chunk() != NULL ?
coleenp@3602 1811 current_chunk()->free_word_size() : 0);
coleenp@3602 1812 }
coleenp@3602 1813
coleenp@3602 1814 // Get another chunk out of the virtual space
coleenp@3602 1815 size_t grow_chunks_by_words = calc_chunk_size(word_size);
coleenp@3602 1816 Metachunk* next = vs_list()->get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 1817
coleenp@3602 1818 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 1819 // and do an allocation from it.
coleenp@3602 1820 if (next != NULL) {
coleenp@3602 1821 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 1822 // Add to this manager's list of chunks in use.
coleenp@3602 1823 add_chunk(next, false);
coleenp@3602 1824 return next->allocate(word_size);
coleenp@3602 1825 }
coleenp@3602 1826 return NULL;
coleenp@3602 1827 }
coleenp@3602 1828
coleenp@3602 1829 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 1830
coleenp@3602 1831 for (ChunkIndex i = SmallIndex;
jmasa@3761 1832 i < NumberOfInUseLists ;
coleenp@3602 1833 i = next_chunk_index(i) ) {
coleenp@3602 1834 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 1835 chunks_in_use(i),
coleenp@3602 1836 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 1837 }
coleenp@3602 1838 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 1839 " Humongous " SIZE_FORMAT,
coleenp@3602 1840 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 1841 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 1842 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 1843 // block free lists
jmasa@3761 1844 if (block_freelists() != NULL) {
jmasa@3761 1845 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 1846 block_freelists()->total_size());
jmasa@3761 1847 }
coleenp@3602 1848 }
coleenp@3602 1849
coleenp@3602 1850 SpaceManager::SpaceManager(Mutex* lock, VirtualSpaceList* vs_list) :
coleenp@3602 1851 _vs_list(vs_list),
coleenp@3602 1852 _allocation_total(0),
coleenp@3602 1853 _lock(lock) {
coleenp@3602 1854 Metadebug::init_allocation_fail_alot_count();
jmasa@3761 1855 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1856 _chunks_in_use[i] = NULL;
coleenp@3602 1857 }
coleenp@3602 1858 _current_chunk = NULL;
coleenp@3602 1859 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1860 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1861 }
coleenp@3602 1862 }
coleenp@3602 1863
coleenp@3602 1864 SpaceManager::~SpaceManager() {
coleenp@3602 1865 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 1866 Mutex::_no_safepoint_check_flag);
coleenp@3602 1867
coleenp@3602 1868 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 1869
mgerdin@3829 1870 chunk_manager->slow_locked_verify();
coleenp@3602 1871
coleenp@3602 1872 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1873 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1874 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 1875 }
coleenp@3602 1876
coleenp@3869 1877 // Mangle freed memory.
coleenp@3869 1878 NOT_PRODUCT(mangle_freed_chunks();)
coleenp@3869 1879
coleenp@3602 1880 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 1881 // below.
coleenp@3602 1882 chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(),
coleenp@3602 1883 sum_count_in_chunks_in_use());
coleenp@3602 1884
coleenp@3602 1885 // Add all the chunks in use by this space manager
coleenp@3602 1886 // to the global list of free chunks.
coleenp@3602 1887
coleenp@3602 1888 // Small chunks. There is one _current_chunk for each
coleenp@3602 1889 // Metaspace. It could point to a small or medium chunk.
coleenp@3602 1890 // Rather than determine which it is, follow the list of
coleenp@3602 1891 // small chunks to add them to the free list
coleenp@3602 1892 Metachunk* small_chunk = chunks_in_use(SmallIndex);
coleenp@3602 1893 chunk_manager->free_small_chunks()->add_at_head(small_chunk);
coleenp@3602 1894 set_chunks_in_use(SmallIndex, NULL);
coleenp@3602 1895
coleenp@3602 1896 // After the small chunk are the medium chunks
coleenp@3602 1897 Metachunk* medium_chunk = chunks_in_use(MediumIndex);
coleenp@3602 1898 assert(medium_chunk == NULL ||
coleenp@3602 1899 medium_chunk->word_size() == MediumChunk,
coleenp@3602 1900 "Chunk is on the wrong list");
coleenp@3602 1901
coleenp@3602 1902 if (medium_chunk != NULL) {
coleenp@3602 1903 Metachunk* head = medium_chunk;
coleenp@3602 1904 // If there is a medium chunk then the _current_chunk can only
coleenp@3602 1905 // point to the last medium chunk.
coleenp@3602 1906 Metachunk* tail = current_chunk();
coleenp@3602 1907 chunk_manager->free_medium_chunks()->add_at_head(head, tail);
coleenp@3602 1908 set_chunks_in_use(MediumIndex, NULL);
coleenp@3602 1909 }
coleenp@3602 1910
coleenp@3602 1911 // Humongous chunks
coleenp@3602 1912 // Humongous chunks are never the current chunk.
coleenp@3602 1913 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 1914
jmasa@3761 1915 while (humongous_chunks != NULL) {
jmasa@3761 1916 #ifdef ASSERT
jmasa@3761 1917 humongous_chunks->set_is_free(true);
jmasa@3761 1918 #endif
jmasa@3761 1919 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@3761 1920 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 1921 humongous_chunks = next_humongous_chunks;
coleenp@3602 1922 }
jmasa@3761 1923 set_chunks_in_use(HumongousIndex, NULL);
mgerdin@3829 1924 chunk_manager->slow_locked_verify();
coleenp@3602 1925 }
coleenp@3602 1926
jmasa@3761 1927 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 1928 assert_lock_strong(_lock);
jmasa@3761 1929 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 1930 assert(word_size >= min_size,
jmasa@3761 1931 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 1932 block_freelists()->return_block(p, word_size);
coleenp@3602 1933 }
coleenp@3602 1934
coleenp@3602 1935 // Adds a chunk to the list of chunks in use.
coleenp@3602 1936 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 1937
coleenp@3602 1938 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 1939 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 1940
coleenp@3602 1941 new_chunk->reset_empty();
coleenp@3602 1942
coleenp@3602 1943 // Find the correct list and and set the current
coleenp@3602 1944 // chunk for that list.
coleenp@3602 1945 switch (new_chunk->word_size()) {
coleenp@3602 1946 case SpaceManager::SmallChunk :
coleenp@3602 1947 if (chunks_in_use(SmallIndex) == NULL) {
coleenp@3602 1948 // First chunk to add to the list
coleenp@3602 1949 set_chunks_in_use(SmallIndex, new_chunk);
coleenp@3602 1950 } else {
coleenp@3602 1951 assert(current_chunk()->word_size() == SpaceManager::SmallChunk,
coleenp@3602 1952 err_msg( "Incorrect mix of sizes in chunk list "
coleenp@3602 1953 SIZE_FORMAT " new chunk " SIZE_FORMAT,
coleenp@3602 1954 current_chunk()->word_size(), new_chunk->word_size()));
coleenp@3602 1955 current_chunk()->set_next(new_chunk);
coleenp@3602 1956 }
coleenp@3602 1957 // Make current chunk
coleenp@3602 1958 set_current_chunk(new_chunk);
coleenp@3602 1959 break;
coleenp@3602 1960 case SpaceManager::MediumChunk :
coleenp@3602 1961 if (chunks_in_use(MediumIndex) == NULL) {
coleenp@3602 1962 // About to add the first medium chunk so teminate the
coleenp@3602 1963 // small chunk list. In general once medium chunks are
coleenp@3602 1964 // being added, we're past the need for small chunks.
coleenp@3602 1965 if (current_chunk() != NULL) {
coleenp@3602 1966 // Only a small chunk or the initial chunk could be
coleenp@3602 1967 // the current chunk if this is the first medium chunk.
coleenp@3602 1968 assert(current_chunk()->word_size() == SpaceManager::SmallChunk ||
coleenp@3602 1969 chunks_in_use(SmallIndex) == NULL,
coleenp@3602 1970 err_msg("Should be a small chunk or initial chunk, current chunk "
coleenp@3602 1971 SIZE_FORMAT " new chunk " SIZE_FORMAT,
coleenp@3602 1972 current_chunk()->word_size(), new_chunk->word_size()));
coleenp@3602 1973 current_chunk()->set_next(NULL);
coleenp@3602 1974 }
coleenp@3602 1975 // First chunk to add to the list
coleenp@3602 1976 set_chunks_in_use(MediumIndex, new_chunk);
coleenp@3602 1977
coleenp@3602 1978 } else {
coleenp@3602 1979 // As a minimum the first medium chunk added would
coleenp@3602 1980 // have become the _current_chunk
coleenp@3602 1981 // so the _current_chunk has to be non-NULL here
coleenp@3602 1982 // (although not necessarily still the first medium chunk).
coleenp@3602 1983 assert(current_chunk()->word_size() == SpaceManager::MediumChunk,
coleenp@3602 1984 "A medium chunk should the current chunk");
coleenp@3602 1985 current_chunk()->set_next(new_chunk);
coleenp@3602 1986 }
coleenp@3602 1987 // Make current chunk
coleenp@3602 1988 set_current_chunk(new_chunk);
coleenp@3602 1989 break;
coleenp@3602 1990 default: {
coleenp@3602 1991 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 1992 // small, so small will be null. Link this first chunk as the current
coleenp@3602 1993 // chunk.
coleenp@3602 1994 if (make_current) {
coleenp@3602 1995 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 1996 set_current_chunk(new_chunk);
coleenp@3602 1997 }
coleenp@3602 1998 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 1999 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2000 // any humongous chunks so will not point to the tail
coleenp@3602 2001 // of the humongous chunks list.
coleenp@3602 2002 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2003 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2004
coleenp@3602 2005 assert(new_chunk->word_size() > MediumChunk, "List inconsistency");
coleenp@3602 2006 }
coleenp@3602 2007 }
coleenp@3602 2008
coleenp@3602 2009 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2010 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2011 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2012 sum_count_in_chunks_in_use());
coleenp@3602 2013 new_chunk->print_on(gclog_or_tty);
coleenp@3602 2014 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
coleenp@3602 2015 }
coleenp@3602 2016 }
coleenp@3602 2017
coleenp@3602 2018 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2019 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2020
coleenp@3602 2021 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2022 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2023 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2024 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2025
jmasa@3761 2026 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2027
jmasa@3761 2028 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2029 Metablock::min_block_byte_size());
jmasa@3761 2030 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2031 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2032 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2033
coleenp@3602 2034 BlockFreelist* fl = block_freelists();
jmasa@3761 2035 MetaWord* p = NULL;
coleenp@3602 2036 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2037 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2038 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2039 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2040 // for allocations. Do some profiling. JJJ
jmasa@3761 2041 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2042 p = fl->get_block(raw_word_size);
coleenp@3602 2043 }
jmasa@3761 2044 if (p == NULL) {
jmasa@3761 2045 p = allocate_work(raw_word_size);
coleenp@3602 2046 }
coleenp@3602 2047 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2048
jmasa@3761 2049 return p;
coleenp@3602 2050 }
coleenp@3602 2051
coleenp@3602 2052 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2053 // This methods does not know about blocks (Metablocks)
jmasa@3761 2054 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2055 assert_lock_strong(_lock);
coleenp@3602 2056 #ifdef ASSERT
coleenp@3602 2057 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2058 return NULL;
coleenp@3602 2059 }
coleenp@3602 2060 #endif
coleenp@3602 2061 // Is there space in the current chunk?
jmasa@3761 2062 MetaWord* result = NULL;
coleenp@3602 2063
coleenp@3602 2064 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2065 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2066 // of memory if this returns null.
coleenp@3602 2067 if (DumpSharedSpaces) {
coleenp@3602 2068 assert(current_chunk() != NULL, "should never happen");
coleenp@3602 2069 inc_allocation_total(word_size);
coleenp@3602 2070 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2071 }
coleenp@3602 2072 if (current_chunk() != NULL) {
coleenp@3602 2073 result = current_chunk()->allocate(word_size);
coleenp@3602 2074 }
coleenp@3602 2075
coleenp@3602 2076 if (result == NULL) {
coleenp@3602 2077 result = grow_and_allocate(word_size);
coleenp@3602 2078 }
coleenp@3602 2079 if (result > 0) {
coleenp@3602 2080 inc_allocation_total(word_size);
jmasa@3761 2081 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2082 "Head of the list is being allocated");
coleenp@3602 2083 }
coleenp@3602 2084
coleenp@3602 2085 return result;
coleenp@3602 2086 }
coleenp@3602 2087
coleenp@3602 2088 void SpaceManager::verify() {
coleenp@3602 2089 // If there are blocks in the dictionary, then
coleenp@3602 2090 // verfication of chunks does not work since
coleenp@3602 2091 // being in the dictionary alters a chunk.
jmasa@3761 2092 if (block_freelists()->total_size() == 0) {
coleenp@3602 2093 // Skip the small chunks because their next link points to
coleenp@3602 2094 // medium chunks. This is because the small chunk is the
coleenp@3602 2095 // current chunk (for allocations) until it is full and the
coleenp@3602 2096 // the addition of the next chunk does not NULL the next
coleenp@3602 2097 // like of the small chunk.
jmasa@3761 2098 for (ChunkIndex i = MediumIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2099 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2100 while (curr != NULL) {
coleenp@3602 2101 curr->verify();
jmasa@3892 2102 verify_chunk_size(curr);
coleenp@3602 2103 curr = curr->next();
coleenp@3602 2104 }
coleenp@3602 2105 }
coleenp@3602 2106 }
coleenp@3602 2107 }
coleenp@3602 2108
jmasa@3892 2109 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2110 assert(is_humongous(chunk->word_size()) ||
jmasa@3892 2111 chunk->word_size() == MediumChunk ||
jmasa@3892 2112 chunk->word_size() == SmallChunk,
jmasa@3892 2113 "Chunk size is wrong");
jmasa@3892 2114 return;
jmasa@3892 2115 }
jmasa@3892 2116
coleenp@3602 2117 #ifdef ASSERT
coleenp@3602 2118 void SpaceManager::verify_allocation_total() {
coleenp@3602 2119 #if 0
coleenp@3602 2120 // Verification is only guaranteed at a safepoint.
coleenp@3602 2121 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2122 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT
coleenp@3602 2123 " sum_used_in_chunks_in_use " SIZE_FORMAT,
coleenp@3602 2124 this,
coleenp@3602 2125 allocation_total(),
coleenp@3602 2126 sum_used_in_chunks_in_use());
coleenp@3602 2127 }
coleenp@3602 2128 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2129 assert(allocation_total() == sum_used_in_chunks_in_use(),
coleenp@3602 2130 err_msg("allocation total is not consistent %d vs %d",
coleenp@3602 2131 allocation_total(), sum_used_in_chunks_in_use()));
coleenp@3602 2132 #endif
coleenp@3602 2133 }
coleenp@3602 2134
coleenp@3602 2135 #endif
coleenp@3602 2136
coleenp@3602 2137 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2138 size_t curr_total = 0;
coleenp@3602 2139 size_t waste = 0;
coleenp@3602 2140 uint i = 0;
coleenp@3602 2141 size_t used = 0;
coleenp@3602 2142 size_t capacity = 0;
coleenp@3602 2143
coleenp@3602 2144 // Add up statistics for all chunks in this SpaceManager.
coleenp@3602 2145 for (ChunkIndex index = SmallIndex;
jmasa@3761 2146 index < NumberOfInUseLists;
coleenp@3602 2147 index = next_chunk_index(index)) {
coleenp@3602 2148 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2149 curr != NULL;
coleenp@3602 2150 curr = curr->next()) {
coleenp@3602 2151 out->print("%d) ", i++);
coleenp@3602 2152 curr->print_on(out);
coleenp@3602 2153 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2154 block_freelists()->print_on(out);
coleenp@3602 2155 }
coleenp@3602 2156 curr_total += curr->word_size();
coleenp@3602 2157 used += curr->used_word_size();
coleenp@3602 2158 capacity += curr->capacity_word_size();
coleenp@3602 2159 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2160 }
coleenp@3602 2161 }
coleenp@3602 2162
coleenp@3602 2163 size_t free = current_chunk()->free_word_size();
coleenp@3602 2164 // Free space isn't wasted.
coleenp@3602 2165 waste -= free;
coleenp@3602 2166
coleenp@3602 2167 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2168 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2169 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2170 }
coleenp@3602 2171
coleenp@3869 2172 #ifndef PRODUCT
coleenp@3602 2173 void SpaceManager::mangle_freed_chunks() {
coleenp@3602 2174 for (ChunkIndex index = SmallIndex;
jmasa@3761 2175 index < NumberOfInUseLists;
coleenp@3602 2176 index = next_chunk_index(index)) {
coleenp@3602 2177 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2178 curr != NULL;
coleenp@3602 2179 curr = curr->next()) {
coleenp@3602 2180 // Try to detect incorrectly terminated small chunk
coleenp@3602 2181 // list.
coleenp@3602 2182 assert(index == MediumIndex || curr != chunks_in_use(MediumIndex),
coleenp@3602 2183 err_msg("Mangling medium chunks in small chunks? "
coleenp@3602 2184 "curr " PTR_FORMAT " medium list " PTR_FORMAT,
coleenp@3602 2185 curr, chunks_in_use(MediumIndex)));
coleenp@3602 2186 curr->mangle();
coleenp@3602 2187 }
coleenp@3602 2188 }
coleenp@3602 2189 }
coleenp@3869 2190 #endif // PRODUCT
coleenp@3602 2191
coleenp@3602 2192
coleenp@3602 2193 // MetaspaceAux
coleenp@3602 2194
coleenp@3869 2195 size_t MetaspaceAux::used_in_bytes() {
coleenp@3869 2196 return (Metaspace::class_space_list()->used_words_sum() +
coleenp@3869 2197 Metaspace::space_list()->used_words_sum()) * BytesPerWord;
coleenp@3869 2198 }
coleenp@3869 2199
jmasa@3611 2200 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) {
jmasa@3607 2201 size_t used = 0;
jmasa@3607 2202 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2203 while (iter.repeat()) {
jmasa@3607 2204 Metaspace* msp = iter.get_next();
jmasa@3607 2205 // Sum allocation_total for each metaspace
jmasa@3607 2206 if (msp != NULL) {
jmasa@3607 2207 used += msp->used_words(mdtype);
jmasa@3607 2208 }
jmasa@3607 2209 }
jmasa@3607 2210 return used * BytesPerWord;
jmasa@3607 2211 }
jmasa@3607 2212
coleenp@3602 2213 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2214 size_t free = 0;
coleenp@3602 2215 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2216 while (iter.repeat()) {
coleenp@3602 2217 Metaspace* msp = iter.get_next();
coleenp@3602 2218 if (msp != NULL) {
coleenp@3602 2219 free += msp->free_words(mdtype);
coleenp@3602 2220 }
coleenp@3602 2221 }
coleenp@3602 2222 return free * BytesPerWord;
coleenp@3602 2223 }
coleenp@3602 2224
coleenp@3602 2225 // The total words available for metadata allocation. This
coleenp@3602 2226 // uses Metaspace capacity_words() which is the total words
coleenp@3602 2227 // in chunks allocated for a Metaspace.
coleenp@3869 2228 size_t MetaspaceAux::capacity_in_bytes() {
coleenp@3869 2229 return (Metaspace::class_space_list()->capacity_words_sum() +
coleenp@3869 2230 Metaspace::space_list()->capacity_words_sum()) * BytesPerWord;
coleenp@3869 2231 }
coleenp@3869 2232
coleenp@3602 2233 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2234 size_t capacity = free_chunks_total(mdtype);
coleenp@3602 2235 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2236 while (iter.repeat()) {
coleenp@3602 2237 Metaspace* msp = iter.get_next();
coleenp@3602 2238 if (msp != NULL) {
coleenp@3602 2239 capacity += msp->capacity_words(mdtype);
coleenp@3602 2240 }
coleenp@3602 2241 }
coleenp@3602 2242 return capacity * BytesPerWord;
coleenp@3602 2243 }
coleenp@3602 2244
coleenp@3869 2245 size_t MetaspaceAux::reserved_in_bytes() {
coleenp@3869 2246 return (Metaspace::class_space_list()->virtual_space_total() +
coleenp@3869 2247 Metaspace::space_list()->virtual_space_total()) * BytesPerWord;
coleenp@3869 2248 }
coleenp@3869 2249
coleenp@3602 2250 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2251 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2252 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2253 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2254 return reserved * BytesPerWord;
coleenp@3602 2255 }
coleenp@3602 2256
coleenp@3602 2257 size_t MetaspaceAux::min_chunk_size() { return SpaceManager::MediumChunk; }
coleenp@3602 2258
coleenp@3602 2259 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2260 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2261 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2262 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2263 chunk->slow_verify();
coleenp@3602 2264 return chunk->free_chunks_total();
coleenp@3602 2265 }
coleenp@3602 2266
coleenp@3602 2267 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2268 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2269 }
coleenp@3602 2270
coleenp@3602 2271 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2272 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2273 if (PrintGCDetails && Verbose) {
coleenp@3602 2274 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2275 "->" SIZE_FORMAT
coleenp@3602 2276 "(" SIZE_FORMAT "/" SIZE_FORMAT ")",
coleenp@3602 2277 prev_metadata_used,
coleenp@3602 2278 used_in_bytes(),
coleenp@3602 2279 capacity_in_bytes(),
coleenp@3602 2280 reserved_in_bytes());
coleenp@3602 2281 } else {
coleenp@3602 2282 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2283 "->" SIZE_FORMAT "K"
coleenp@3602 2284 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)",
coleenp@3602 2285 prev_metadata_used / K,
coleenp@3602 2286 used_in_bytes()/ K,
coleenp@3602 2287 capacity_in_bytes()/K,
coleenp@3602 2288 reserved_in_bytes()/ K);
coleenp@3602 2289 }
coleenp@3602 2290
coleenp@3602 2291 gclog_or_tty->print("]");
coleenp@3602 2292 }
coleenp@3602 2293
coleenp@3602 2294 // This is printed when PrintGCDetails
coleenp@3602 2295 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2296 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2297 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2298
coleenp@3602 2299 out->print_cr(" Metaspace total "
coleenp@3602 2300 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2301 " reserved " SIZE_FORMAT "K",
jmasa@3611 2302 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K);
coleenp@3602 2303 out->print_cr(" data space "
coleenp@3602 2304 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2305 " reserved " SIZE_FORMAT "K",
jmasa@3611 2306 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K);
coleenp@3602 2307 out->print_cr(" class space "
coleenp@3602 2308 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2309 " reserved " SIZE_FORMAT "K",
jmasa@3611 2310 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K);
coleenp@3602 2311 }
coleenp@3602 2312
coleenp@3602 2313 // Print information for class space and data space separately.
coleenp@3602 2314 // This is almost the same as above.
coleenp@3602 2315 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2316 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
coleenp@3602 2317 size_t capacity_bytes = capacity_in_bytes(mdtype);
coleenp@3602 2318 size_t used_bytes = used_in_bytes(mdtype);
coleenp@3602 2319 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2320 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2321 free_chunks_capacity_bytes;
coleenp@3602 2322 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2323 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2324 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2325 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2326 used_bytes / K,
coleenp@3602 2327 free_bytes / K,
coleenp@3602 2328 free_chunks_capacity_bytes / K,
coleenp@3602 2329 used_and_free / K,
coleenp@3602 2330 capacity_bytes / K);
coleenp@3602 2331 assert(used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2332 }
coleenp@3602 2333
coleenp@3602 2334 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2335 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2336
coleenp@3602 2337 size_t small_waste = 0, medium_waste = 0, large_waste = 0;
coleenp@3602 2338 size_t cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
coleenp@3602 2339
coleenp@3602 2340 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2341 while (iter.repeat()) {
coleenp@3602 2342 Metaspace* msp = iter.get_next();
coleenp@3602 2343 if (msp != NULL) {
coleenp@3602 2344 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
coleenp@3602 2345 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
coleenp@3602 2346 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
coleenp@3602 2347
coleenp@3602 2348 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
coleenp@3602 2349 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
coleenp@3602 2350 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
coleenp@3602 2351 }
coleenp@3602 2352 }
coleenp@3602 2353 out->print_cr("Total fragmentation waste (words) doesn't count free space");
coleenp@3602 2354 out->print(" data: small " SIZE_FORMAT " medium " SIZE_FORMAT,
coleenp@3602 2355 small_waste, medium_waste);
coleenp@3602 2356 out->print_cr(" class: small " SIZE_FORMAT, cls_small_waste);
coleenp@3602 2357 }
coleenp@3602 2358
coleenp@3602 2359 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2360 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2361 out->print_cr("All Metaspace:");
coleenp@3602 2362 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2363 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2364 print_waste(out);
coleenp@3602 2365 }
coleenp@3602 2366
mgerdin@3829 2367 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2368 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2369 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2370 }
mgerdin@3829 2371
coleenp@3602 2372 // Metaspace methods
coleenp@3602 2373
coleenp@3602 2374 size_t Metaspace::_first_chunk_word_size = 0;
coleenp@3602 2375
coleenp@3602 2376 Metaspace::Metaspace(Mutex* lock, size_t word_size) {
coleenp@3602 2377 initialize(lock, word_size);
coleenp@3602 2378 }
coleenp@3602 2379
coleenp@3602 2380 Metaspace::Metaspace(Mutex* lock) {
coleenp@3602 2381 initialize(lock);
coleenp@3602 2382 }
coleenp@3602 2383
coleenp@3602 2384 Metaspace::~Metaspace() {
coleenp@3602 2385 delete _vsm;
coleenp@3602 2386 delete _class_vsm;
coleenp@3602 2387 }
coleenp@3602 2388
coleenp@3602 2389 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2390 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2391
coleenp@3602 2392 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2393
coleenp@3602 2394 void Metaspace::global_initialize() {
coleenp@3602 2395 // Initialize the alignment for shared spaces.
coleenp@3602 2396 int max_alignment = os::vm_page_size();
coleenp@3602 2397 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2398
coleenp@3602 2399 if (DumpSharedSpaces) {
coleenp@3602 2400 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2401 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2402 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2403 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2404
coleenp@3602 2405 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2406 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2407 // remainder is the misc code and data chunks.
coleenp@3602 2408 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2409 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2410 os::vm_allocation_granularity());
coleenp@3602 2411 size_t word_size = total/wordSize;
coleenp@3602 2412 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2413 } else {
coleenp@3602 2414 // If using shared space, open the file that contains the shared space
coleenp@3602 2415 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2416 // the addresses don't conflict)
coleenp@3602 2417 if (UseSharedSpaces) {
coleenp@3602 2418 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2419 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2420
coleenp@3602 2421 // Open the shared archive file, read and validate the header. If
coleenp@3602 2422 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2423 // disabled and the file is closed.
coleenp@3602 2424 // Map in spaces now also
coleenp@3602 2425 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2426 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2427 } else {
coleenp@3602 2428 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2429 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2430 }
coleenp@3602 2431 }
coleenp@3602 2432
coleenp@3602 2433 // Initialize this before initializing the VirtualSpaceList
coleenp@3602 2434 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
coleenp@3602 2435 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2436 // of the boot class loader size.
coleenp@3602 2437 size_t word_size = VIRTUALSPACEMULTIPLIER * Metaspace::first_chunk_word_size();
coleenp@3602 2438 // Initialize the list of virtual spaces.
coleenp@3602 2439 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2440 }
coleenp@3602 2441 }
coleenp@3602 2442
coleenp@3602 2443 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2444 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2445 // argument passed in is at the top of the compressed space
coleenp@3602 2446 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2447 // The reserved space size may be bigger because of alignment, esp with UseLargePages
coleenp@3602 2448 assert(rs.size() >= ClassMetaspaceSize, err_msg("%d != %d", rs.size(), ClassMetaspaceSize));
coleenp@3602 2449 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2450 }
coleenp@3602 2451
coleenp@3602 2452
coleenp@3602 2453 void Metaspace::initialize(Mutex* lock, size_t initial_size) {
coleenp@3613 2454 // Use SmallChunk size if not specified. If specified, use this size for
coleenp@3613 2455 // the data metaspace.
coleenp@3602 2456 size_t word_size;
coleenp@3602 2457 size_t class_word_size;
coleenp@3602 2458 if (initial_size == 0) {
coleenp@3602 2459 word_size = (size_t) SpaceManager::SmallChunk;
coleenp@3613 2460 class_word_size = (size_t) SpaceManager::SmallChunk;
coleenp@3602 2461 } else {
coleenp@3602 2462 word_size = initial_size;
coleenp@3613 2463 // Make the first class chunk bigger than a medium chunk so it's not put
coleenp@3613 2464 // on the medium chunk list. The next chunk will be small and progress
coleenp@3613 2465 // from there. This size calculated by -version.
coleenp@3613 2466 class_word_size = MIN2((size_t)SpaceManager::MediumChunk*5,
coleenp@3613 2467 (ClassMetaspaceSize/BytesPerWord)*2);
coleenp@3602 2468 }
coleenp@3602 2469
coleenp@3602 2470 assert(space_list() != NULL,
coleenp@3602 2471 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2472
coleenp@3602 2473 _vsm = new SpaceManager(lock, space_list());
coleenp@3602 2474 if (_vsm == NULL) {
coleenp@3602 2475 return;
coleenp@3602 2476 }
coleenp@3602 2477
coleenp@3602 2478 assert(class_space_list() != NULL,
coleenp@3602 2479 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2480
coleenp@3602 2481 // Allocate SpaceManager for classes.
coleenp@3602 2482 _class_vsm = new SpaceManager(lock, class_space_list());
coleenp@3602 2483 if (_class_vsm == NULL) {
coleenp@3602 2484 return;
coleenp@3602 2485 }
coleenp@3602 2486
coleenp@3602 2487 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2488
coleenp@3602 2489 // Allocate chunk for metadata objects
coleenp@3602 2490 Metachunk* new_chunk =
coleenp@3602 2491 space_list()->current_virtual_space()->get_chunk_vs_with_expand(word_size);
coleenp@3602 2492 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2493 if (new_chunk != NULL) {
coleenp@3602 2494 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2495 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2496 }
coleenp@3602 2497
coleenp@3602 2498 // Allocate chunk for class metadata objects
coleenp@3602 2499 Metachunk* class_chunk =
coleenp@3602 2500 class_space_list()->current_virtual_space()->get_chunk_vs_with_expand(class_word_size);
coleenp@3602 2501 if (class_chunk != NULL) {
coleenp@3602 2502 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2503 }
coleenp@3602 2504 }
coleenp@3602 2505
coleenp@3602 2506 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2507 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2508 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2509 return class_vsm()->allocate(word_size);
coleenp@3602 2510 } else {
jmasa@3761 2511 return vsm()->allocate(word_size);
coleenp@3602 2512 }
coleenp@3602 2513 }
coleenp@3602 2514
jmasa@3629 2515 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2516 MetaWord* result;
jmasa@3629 2517 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2518 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@3629 2519 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size);
jmasa@3629 2520 MetaspaceGC::inc_capacity_until_GC(delta_words);
jmasa@3629 2521 if (PrintGCDetails && Verbose) {
jmasa@3629 2522 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2523 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2524 }
jmasa@3761 2525
jmasa@3629 2526 result = allocate(word_size, mdtype);
jmasa@3629 2527
jmasa@3629 2528 return result;
jmasa@3629 2529 }
jmasa@3629 2530
coleenp@3602 2531 // Space allocated in the Metaspace. This may
coleenp@3602 2532 // be across several metadata virtual spaces.
coleenp@3602 2533 char* Metaspace::bottom() const {
coleenp@3602 2534 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2535 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2536 }
coleenp@3602 2537
coleenp@3602 2538 size_t Metaspace::used_words(MetadataType mdtype) const {
coleenp@3602 2539 // return vsm()->allocation_total();
coleenp@3602 2540 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2541 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2542 }
coleenp@3602 2543
coleenp@3602 2544 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2545 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2546 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2547 }
coleenp@3602 2548
coleenp@3602 2549 // Space capacity in the Metaspace. It includes
coleenp@3602 2550 // space in the list of chunks from which allocations
coleenp@3602 2551 // have been made. Don't include space in the global freelist and
coleenp@3602 2552 // in the space available in the dictionary which
coleenp@3602 2553 // is already counted in some chunk.
coleenp@3602 2554 size_t Metaspace::capacity_words(MetadataType mdtype) const {
coleenp@3602 2555 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2556 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2557 }
coleenp@3602 2558
coleenp@3602 2559 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2560 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2561 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2562 // Don't take Heap_lock
jmasa@3761 2563 MutexLocker ml(vsm()->lock());
jmasa@3761 2564 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2565 // Dark matter. Too small for dictionary.
jmasa@3761 2566 #ifdef ASSERT
jmasa@3761 2567 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2568 #endif
jmasa@3761 2569 return;
jmasa@3761 2570 }
coleenp@3602 2571 if (is_class) {
jmasa@3761 2572 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2573 } else {
jmasa@3761 2574 vsm()->deallocate(ptr, word_size);
coleenp@3602 2575 }
coleenp@3602 2576 } else {
coleenp@3602 2577 MutexLocker ml(vsm()->lock());
coleenp@3602 2578
jmasa@3761 2579 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2580 // Dark matter. Too small for dictionary.
jmasa@3761 2581 #ifdef ASSERT
jmasa@3761 2582 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2583 #endif
jmasa@3761 2584 return;
jmasa@3761 2585 }
coleenp@3602 2586 if (is_class) {
jmasa@3761 2587 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2588 } else {
jmasa@3761 2589 vsm()->deallocate(ptr, word_size);
coleenp@3602 2590 }
coleenp@3602 2591 }
coleenp@3602 2592 }
coleenp@3602 2593
jmasa@3761 2594 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 2595 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 2596 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 2597 assert(false, "Should not allocate with exception pending");
coleenp@3602 2598 return NULL; // caller does a CHECK_NULL too
coleenp@3602 2599 }
coleenp@3602 2600
coleenp@3602 2601 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 2602 MetaWord* result = NULL;
coleenp@3602 2603
coleenp@3602 2604 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 2605 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 2606 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 2607 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 2608 // to revisit this for application class data sharing.
coleenp@3602 2609 if (DumpSharedSpaces) {
coleenp@3602 2610 if (read_only) {
coleenp@3602 2611 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2612 } else {
coleenp@3602 2613 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2614 }
coleenp@3602 2615 if (result == NULL) {
coleenp@3602 2616 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 2617 }
jmasa@3761 2618 return Metablock::initialize(result, word_size);
coleenp@3602 2619 }
coleenp@3602 2620
coleenp@3602 2621 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 2622
coleenp@3602 2623 if (result == NULL) {
coleenp@3602 2624 // Try to clean out some memory and retry.
coleenp@3602 2625 result =
jmasa@3761 2626 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 2627 loader_data, word_size, mdtype);
coleenp@3602 2628
coleenp@3602 2629 // If result is still null, we are out of memory.
coleenp@3602 2630 if (result == NULL) {
coleenp@3602 2631 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 2632 report_java_out_of_memory("Metadata space");
coleenp@3602 2633
coleenp@3602 2634 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 2635 JvmtiExport::post_resource_exhausted(
coleenp@3602 2636 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 2637 "Metadata space");
coleenp@3602 2638 }
coleenp@3602 2639 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 2640 }
coleenp@3602 2641 }
jmasa@3761 2642 return Metablock::initialize(result, word_size);
coleenp@3602 2643 }
coleenp@3602 2644
coleenp@3602 2645 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 2646 // Print both class virtual space counts and metaspace.
coleenp@3602 2647 if (Verbose) {
coleenp@3602 2648 vsm()->print_on(out);
coleenp@3602 2649 class_vsm()->print_on(out);
coleenp@3602 2650 }
coleenp@3602 2651 }
coleenp@3602 2652
coleenp@3860 2653 bool Metaspace::contains(const void * ptr) {
coleenp@3602 2654 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 2655 return true;
coleenp@3602 2656 }
coleenp@3860 2657 // This is checked while unlocked. As long as the virtualspaces are added
coleenp@3860 2658 // at the end, the pointer will be in one of them. The virtual spaces
coleenp@3860 2659 // aren't deleted presently. When they are, some sort of locking might
coleenp@3860 2660 // be needed. Note, locking this can cause inversion problems with the
coleenp@3860 2661 // caller in MetaspaceObj::is_metadata() function.
coleenp@3602 2662 return space_list()->contains(ptr) || class_space_list()->contains(ptr);
coleenp@3602 2663 }
coleenp@3602 2664
coleenp@3602 2665 void Metaspace::verify() {
coleenp@3602 2666 vsm()->verify();
coleenp@3602 2667 class_vsm()->verify();
coleenp@3602 2668 }
coleenp@3602 2669
coleenp@3602 2670 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 2671 if (UseMallocOnly) {
coleenp@3602 2672 // Just print usage for now
coleenp@3602 2673 out->print_cr("usage %d", used_words(Metaspace::NonClassType));
coleenp@3602 2674 }
coleenp@3602 2675 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 2676 vsm()->dump(out);
coleenp@3602 2677 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 2678 class_vsm()->dump(out);
coleenp@3602 2679 }