annotate src/share/vm/memory/metaspace.cpp @ 3761:685df3c6f84b

7045397: NPG: Add freelists to class loader arenas. Reviewed-by: coleenp, stefank, jprovino, ohair
author jmasa
date Tue, 18 Sep 2012 23:35:42 -0700
parents 5baec2e69518
children 6bc207d87e5d
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@3602 39 #include "services/memTracker.hpp"
coleenp@3602 40 #include "utilities/copy.hpp"
coleenp@3602 41 #include "utilities/debug.hpp"
coleenp@3602 42
jmasa@3761 43 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
jmasa@3761 44 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
coleenp@3602 45
coleenp@3602 46 // Parameters for stress mode testing
coleenp@3602 47 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 48 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 49 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 50 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
coleenp@3602 51 const size_t metadata_deallocate = 0xf5f5f5f5;
coleenp@3602 52
coleenp@3602 53 MetaWord* last_allocated = 0;
coleenp@3602 54
coleenp@3602 55 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 56 enum ChunkIndex {
coleenp@3602 57 SmallIndex = 0,
coleenp@3602 58 MediumIndex = 1,
coleenp@3602 59 HumongousIndex = 2,
jmasa@3761 60 NumberOfFreeLists = 2,
jmasa@3761 61 NumberOfInUseLists = 3
coleenp@3602 62 };
coleenp@3602 63
coleenp@3602 64 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 65 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 66 return (ChunkIndex) (i+1);
coleenp@3602 67 }
coleenp@3602 68
coleenp@3602 69 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 70 // the default MetaspaceSize before argument processing was being
coleenp@3602 71 // used which was not the desired value. See the code
coleenp@3602 72 // in should_expand() to see how the initialization is handled
coleenp@3602 73 // now.
coleenp@3602 74 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 75 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 76 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 77 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 78
coleenp@3602 79 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 80 //
coleenp@3602 81 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 82 // allocated there is no explicit link between a Metachunk and
coleenp@3602 83 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 84 //
coleenp@3602 85 // Each SpaceManager maintains a
coleenp@3602 86 // list of the chunks it is using and the current chunk. The current
coleenp@3602 87 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 88 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 89 // reused from there.
coleenp@3602 90 //
coleenp@3602 91 // Future modification
coleenp@3602 92 //
coleenp@3602 93 // The Metachunk can conceivable be replaced by the Chunk in
coleenp@3602 94 // allocation.hpp. Note that the latter Chunk is the space for
coleenp@3602 95 // allocation (allocations from the chunk are out of the space in
coleenp@3602 96 // the Chunk after the header for the Chunk) where as Metachunks
coleenp@3602 97 // point to space in a VirtualSpace. To replace Metachunks with
coleenp@3602 98 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
jmasa@3761 99 size_t Metablock::_min_block_byte_size = sizeof(Metablock);
coleenp@3602 100 #ifdef ASSERT
jmasa@3761 101 size_t Metablock::_overhead =
jmasa@3761 102 Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord;
jmasa@3761 103 #else
jmasa@3761 104 size_t Metablock::_overhead = 0;
coleenp@3602 105 #endif
coleenp@3602 106
coleenp@3602 107
coleenp@3602 108 // Pointer to list of Metachunks.
coleenp@3602 109 class ChunkList VALUE_OBJ_CLASS_SPEC {
coleenp@3602 110 // List of free chunks
coleenp@3602 111 Metachunk* _head;
coleenp@3602 112
coleenp@3602 113 public:
coleenp@3602 114 // Constructor
coleenp@3602 115 ChunkList() : _head(NULL) {}
coleenp@3602 116
coleenp@3602 117 // Accessors
coleenp@3602 118 Metachunk* head() { return _head; }
coleenp@3602 119 void set_head(Metachunk* v) { _head = v; }
coleenp@3602 120
coleenp@3602 121 // Link at head of the list
coleenp@3602 122 void add_at_head(Metachunk* head, Metachunk* tail);
coleenp@3602 123 void add_at_head(Metachunk* head);
coleenp@3602 124
coleenp@3602 125 size_t sum_list_size();
coleenp@3602 126 size_t sum_list_count();
coleenp@3602 127 size_t sum_list_capacity();
coleenp@3602 128 };
coleenp@3602 129
coleenp@3602 130 // Manages the global free lists of chunks.
coleenp@3602 131 // Has three lists of free chunks, and a total size and
coleenp@3602 132 // count that includes all three
coleenp@3602 133
coleenp@3602 134 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 135
coleenp@3602 136 // Free list of chunks of different sizes.
coleenp@3602 137 // SmallChunk
coleenp@3602 138 // MediumChunk
coleenp@3602 139 // HumongousChunk
jmasa@3761 140 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 141
jmasa@3761 142 // HumongousChunk
jmasa@3761 143 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 144
coleenp@3602 145 // ChunkManager in all lists of this type
coleenp@3602 146 size_t _free_chunks_total;
coleenp@3602 147 size_t _free_chunks_count;
coleenp@3602 148
coleenp@3602 149 void dec_free_chunks_total(size_t v) {
coleenp@3602 150 assert(_free_chunks_count > 0 &&
coleenp@3602 151 _free_chunks_total > 0,
coleenp@3602 152 "About to go negative");
coleenp@3602 153 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 154 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 155 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 156 }
coleenp@3602 157
coleenp@3602 158 // Debug support
coleenp@3602 159
coleenp@3602 160 size_t sum_free_chunks();
coleenp@3602 161 size_t sum_free_chunks_count();
coleenp@3602 162
coleenp@3602 163 void locked_verify_free_chunks_total();
coleenp@3602 164 void locked_verify_free_chunks_count();
coleenp@3602 165 void verify_free_chunks_count();
coleenp@3602 166
coleenp@3602 167 public:
coleenp@3602 168
coleenp@3602 169 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 170
coleenp@3602 171 // add or delete (return) a chunk to the global freelist.
coleenp@3602 172 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 173 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 174
coleenp@3602 175 // Total of the space in the free chunks list
coleenp@3602 176 size_t free_chunks_total();
coleenp@3602 177 size_t free_chunks_total_in_bytes();
coleenp@3602 178
coleenp@3602 179 // Number of chunks in the free chunks list
coleenp@3602 180 size_t free_chunks_count();
coleenp@3602 181
coleenp@3602 182 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 183 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 184 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 185 }
coleenp@3602 186 ChunkList* free_medium_chunks() { return &_free_chunks[1]; }
coleenp@3602 187 ChunkList* free_small_chunks() { return &_free_chunks[0]; }
jmasa@3761 188 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 189 return &_humongous_dictionary;
jmasa@3761 190 }
coleenp@3602 191
coleenp@3602 192 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 193
coleenp@3602 194 // Returns the list for the given chunk word size.
coleenp@3602 195 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 196
coleenp@3602 197 // Add and remove from a list by size. Selects
coleenp@3602 198 // list based on size of chunk.
coleenp@3602 199 void free_chunks_put(Metachunk* chuck);
coleenp@3602 200 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 201
coleenp@3602 202 // Debug support
coleenp@3602 203 void verify();
coleenp@3602 204 void locked_verify();
coleenp@3602 205 void verify_free_chunks_total();
coleenp@3602 206
coleenp@3602 207 void locked_print_free_chunks(outputStream* st);
coleenp@3602 208 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 209
jmasa@3761 210 void print_on(outputStream* st);
coleenp@3602 211 };
coleenp@3602 212
coleenp@3602 213
coleenp@3602 214 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 215 // to the allocation of a quantum of metadata).
coleenp@3602 216 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 217 BlockTreeDictionary* _dictionary;
jmasa@3761 218 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 219
coleenp@3602 220 // Accessors
jmasa@3761 221 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 222
coleenp@3602 223 public:
coleenp@3602 224 BlockFreelist();
coleenp@3602 225 ~BlockFreelist();
coleenp@3602 226
coleenp@3602 227 // Get and return a block to the free list
jmasa@3761 228 MetaWord* get_block(size_t word_size);
jmasa@3761 229 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 230
jmasa@3761 231 size_t total_size() {
jmasa@3761 232 if (dictionary() == NULL) {
coleenp@3602 233 return 0;
jmasa@3761 234 } else {
jmasa@3761 235 return dictionary()->total_size();
coleenp@3602 236 }
jmasa@3761 237 }
coleenp@3602 238
coleenp@3602 239 void print_on(outputStream* st) const;
coleenp@3602 240 };
coleenp@3602 241
coleenp@3602 242 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 243 friend class VirtualSpaceList;
coleenp@3602 244
coleenp@3602 245 // Link to next VirtualSpaceNode
coleenp@3602 246 VirtualSpaceNode* _next;
coleenp@3602 247
coleenp@3602 248 // total in the VirtualSpace
coleenp@3602 249 MemRegion _reserved;
coleenp@3602 250 ReservedSpace _rs;
coleenp@3602 251 VirtualSpace _virtual_space;
coleenp@3602 252 MetaWord* _top;
coleenp@3602 253
coleenp@3602 254 // Convenience functions for logical bottom and end
coleenp@3602 255 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 256 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 257
coleenp@3602 258 // Convenience functions to access the _virtual_space
coleenp@3602 259 char* low() const { return virtual_space()->low(); }
coleenp@3602 260 char* high() const { return virtual_space()->high(); }
coleenp@3602 261
coleenp@3602 262 public:
coleenp@3602 263
coleenp@3602 264 VirtualSpaceNode(size_t byte_size);
coleenp@3602 265 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {}
coleenp@3602 266 ~VirtualSpaceNode();
coleenp@3602 267
coleenp@3602 268 // address of next available space in _virtual_space;
coleenp@3602 269 // Accessors
coleenp@3602 270 VirtualSpaceNode* next() { return _next; }
coleenp@3602 271 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 272
coleenp@3602 273 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 274 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 275
coleenp@3602 276 // Accessors
coleenp@3602 277 MemRegion* reserved() { return &_reserved; }
coleenp@3602 278 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 279
coleenp@3602 280 // Returns true if "word_size" is available in the virtual space
coleenp@3602 281 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 282
coleenp@3602 283 MetaWord* top() const { return _top; }
coleenp@3602 284 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 285
coleenp@3602 286 // used and capacity in this single entry in the list
coleenp@3602 287 size_t used_words_in_vs() const;
coleenp@3602 288 size_t capacity_words_in_vs() const;
coleenp@3602 289
coleenp@3602 290 bool initialize();
coleenp@3602 291
coleenp@3602 292 // get space from the virtual space
coleenp@3602 293 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 294
coleenp@3602 295 // Allocate a chunk from the virtual space and return it.
coleenp@3602 296 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 297 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 298
coleenp@3602 299 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 300 // to Virtualspace
coleenp@3602 301 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 302 bool shrink_by(size_t words);
coleenp@3602 303
coleenp@3602 304 // Debug support
coleenp@3602 305 static void verify_virtual_space_total();
coleenp@3602 306 static void verify_virtual_space_count();
coleenp@3602 307 void mangle();
coleenp@3602 308
coleenp@3602 309 void print_on(outputStream* st) const;
coleenp@3602 310 };
coleenp@3602 311
coleenp@3602 312 // byte_size is the size of the associated virtualspace.
coleenp@3602 313 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) {
coleenp@3602 314 // This allocates memory with mmap. For DumpSharedspaces, allocate the
coleenp@3602 315 // space at low memory so that other shared images don't conflict.
coleenp@3602 316 // This is the same address as memory needed for UseCompressedOops but
coleenp@3602 317 // compressed oops don't work with CDS (offsets in metadata are wrong), so
coleenp@3602 318 // borrow the same address.
coleenp@3602 319 if (DumpSharedSpaces) {
coleenp@3602 320 char* shared_base = (char*)HeapBaseMinAddress;
coleenp@3602 321 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 322 if (_rs.is_reserved()) {
coleenp@3602 323 assert(_rs.base() == shared_base, "should match");
coleenp@3602 324 } else {
coleenp@3602 325 // If we are dumping the heap, then allocate a wasted block of address
coleenp@3602 326 // space in order to push the heap to a lower address. This extra
coleenp@3602 327 // address range allows for other (or larger) libraries to be loaded
coleenp@3602 328 // without them occupying the space required for the shared spaces.
coleenp@3602 329 uintx reserved = 0;
coleenp@3602 330 uintx block_size = 64*1024*1024;
coleenp@3602 331 while (reserved < SharedDummyBlockSize) {
coleenp@3602 332 char* dummy = os::reserve_memory(block_size);
coleenp@3602 333 reserved += block_size;
coleenp@3602 334 }
coleenp@3602 335 _rs = ReservedSpace(byte_size);
coleenp@3602 336 }
coleenp@3602 337 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 338 } else {
coleenp@3602 339 _rs = ReservedSpace(byte_size);
coleenp@3602 340 }
coleenp@3602 341
coleenp@3602 342 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 343 }
coleenp@3602 344
coleenp@3602 345 // List of VirtualSpaces for metadata allocation.
coleenp@3602 346 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 347 // for total space in the VirtualSpace.
coleenp@3602 348 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 349 friend class VirtualSpaceNode;
coleenp@3602 350
coleenp@3602 351 enum VirtualSpaceSizes {
coleenp@3602 352 VirtualSpaceSize = 256 * K
coleenp@3602 353 };
coleenp@3602 354
coleenp@3602 355 // Global list of virtual spaces
coleenp@3602 356 // Head of the list
coleenp@3602 357 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 358 // virtual space currently being used for allocations
coleenp@3602 359 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 360 // Free chunk list for all other metadata
coleenp@3602 361 ChunkManager _chunk_manager;
coleenp@3602 362
coleenp@3602 363 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 364 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 365 bool _is_class;
coleenp@3602 366 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 367
coleenp@3602 368 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 369 size_t _virtual_space_total;
coleenp@3602 370 size_t _virtual_space_count;
coleenp@3602 371
coleenp@3602 372 ~VirtualSpaceList();
coleenp@3602 373
coleenp@3602 374 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 375
coleenp@3602 376 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 377 _virtual_space_list = v;
coleenp@3602 378 }
coleenp@3602 379 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 380 _current_virtual_space = v;
coleenp@3602 381 }
coleenp@3602 382
coleenp@3602 383 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 384
coleenp@3602 385 // Get another virtual space and add it to the list. This
coleenp@3602 386 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 387 // and is typically followed by the allocation of a chunk.
coleenp@3602 388 bool grow_vs(size_t vs_word_size);
coleenp@3602 389
coleenp@3602 390 public:
coleenp@3602 391 VirtualSpaceList(size_t word_size);
coleenp@3602 392 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 393
coleenp@3602 394 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
coleenp@3602 395
coleenp@3602 396 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 397 return _current_virtual_space;
coleenp@3602 398 }
coleenp@3602 399
coleenp@3602 400 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 401 bool is_class() const { return _is_class; }
coleenp@3602 402
coleenp@3602 403 // Allocate the first virtualspace.
coleenp@3602 404 void initialize(size_t word_size);
coleenp@3602 405
coleenp@3602 406 size_t virtual_space_total() { return _virtual_space_total; }
coleenp@3602 407 void inc_virtual_space_total(size_t v) {
coleenp@3602 408 Atomic::add_ptr(v, &_virtual_space_total);
coleenp@3602 409 }
coleenp@3602 410
coleenp@3602 411 size_t virtual_space_count() { return _virtual_space_count; }
coleenp@3602 412 void inc_virtual_space_count() {
coleenp@3602 413 Atomic::inc_ptr(&_virtual_space_count);
coleenp@3602 414 }
coleenp@3602 415
coleenp@3602 416 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 417 // These are global values shared by all Metaspaces
coleenp@3602 418 size_t capacity_words_sum();
coleenp@3602 419 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 420 size_t used_words_sum();
coleenp@3602 421 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 422
coleenp@3602 423 bool contains(const void *ptr);
coleenp@3602 424
coleenp@3602 425 void print_on(outputStream* st) const;
coleenp@3602 426
coleenp@3602 427 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 428 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 429 public:
coleenp@3602 430 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 431 _virtual_spaces(virtual_spaces) {}
coleenp@3602 432
coleenp@3602 433 bool repeat() {
coleenp@3602 434 return _virtual_spaces != NULL;
coleenp@3602 435 }
coleenp@3602 436
coleenp@3602 437 VirtualSpaceNode* get_next() {
coleenp@3602 438 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 439 if (_virtual_spaces != NULL) {
coleenp@3602 440 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 441 }
coleenp@3602 442 return result;
coleenp@3602 443 }
coleenp@3602 444 };
coleenp@3602 445 };
coleenp@3602 446
coleenp@3602 447 class Metadebug : AllStatic {
coleenp@3602 448 // Debugging support for Metaspaces
coleenp@3602 449 static int _deallocate_block_a_lot_count;
coleenp@3602 450 static int _deallocate_chunk_a_lot_count;
coleenp@3602 451 static int _allocation_fail_alot_count;
coleenp@3602 452
coleenp@3602 453 public:
coleenp@3602 454 static int deallocate_block_a_lot_count() {
coleenp@3602 455 return _deallocate_block_a_lot_count;
coleenp@3602 456 }
coleenp@3602 457 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 458 _deallocate_block_a_lot_count = v;
coleenp@3602 459 }
coleenp@3602 460 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 461 _deallocate_block_a_lot_count++;
coleenp@3602 462 }
coleenp@3602 463 static int deallocate_chunk_a_lot_count() {
coleenp@3602 464 return _deallocate_chunk_a_lot_count;
coleenp@3602 465 }
coleenp@3602 466 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 467 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 468 }
coleenp@3602 469 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 470 _deallocate_chunk_a_lot_count++;
coleenp@3602 471 }
coleenp@3602 472
coleenp@3602 473 static void init_allocation_fail_alot_count();
coleenp@3602 474 #ifdef ASSERT
coleenp@3602 475 static bool test_metadata_failure();
coleenp@3602 476 #endif
coleenp@3602 477
coleenp@3602 478 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 479 size_t chunk_word_size);
coleenp@3602 480 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 481 size_t chunk_word_size);
coleenp@3602 482
coleenp@3602 483 };
coleenp@3602 484
coleenp@3602 485 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 486 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 487 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 488
coleenp@3602 489 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 490 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 491 friend class Metaspace;
coleenp@3602 492 friend class Metadebug;
coleenp@3602 493
coleenp@3602 494 private:
coleenp@3602 495 // protects allocations and contains.
coleenp@3602 496 Mutex* const _lock;
coleenp@3602 497
coleenp@3602 498 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 499 // are done from the current chunk. The list is used for deallocating
coleenp@3602 500 // chunks when the SpaceManager is freed.
jmasa@3761 501 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 502 Metachunk* _current_chunk;
coleenp@3602 503
coleenp@3602 504 // Virtual space where allocation comes from.
coleenp@3602 505 VirtualSpaceList* _vs_list;
coleenp@3602 506
coleenp@3602 507 // Number of small chunks to allocate to a manager
coleenp@3602 508 // If class space manager, small chunks are unlimited
coleenp@3602 509 static uint const _small_chunk_limit;
coleenp@3602 510 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 511
coleenp@3602 512 // Sum of all space in allocated chunks
coleenp@3602 513 size_t _allocation_total;
coleenp@3602 514
coleenp@3602 515 // Free lists of blocks are per SpaceManager since they
coleenp@3602 516 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 517 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 518 // the class loader using the SpaceManager is collected.
coleenp@3602 519 BlockFreelist _block_freelists;
coleenp@3602 520
coleenp@3602 521 // protects virtualspace and chunk expansions
coleenp@3602 522 static const char* _expand_lock_name;
coleenp@3602 523 static const int _expand_lock_rank;
coleenp@3602 524 static Mutex* const _expand_lock;
coleenp@3602 525
coleenp@3602 526 // Accessors
coleenp@3602 527 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 528 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 529
coleenp@3602 530 BlockFreelist* block_freelists() const {
coleenp@3602 531 return (BlockFreelist*) &_block_freelists;
coleenp@3602 532 }
coleenp@3602 533
coleenp@3602 534 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 535
coleenp@3602 536 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 537 void set_current_chunk(Metachunk* v) {
coleenp@3602 538 _current_chunk = v;
coleenp@3602 539 }
coleenp@3602 540
coleenp@3602 541 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 542
coleenp@3602 543 // Add chunk to the list of chunks in use
coleenp@3602 544 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 545
coleenp@3602 546 Mutex* lock() const { return _lock; }
coleenp@3602 547
coleenp@3602 548 public:
coleenp@3602 549 SpaceManager(Mutex* lock, VirtualSpaceList* vs_list);
coleenp@3602 550 ~SpaceManager();
coleenp@3602 551
coleenp@3602 552 enum ChunkSizes { // in words.
coleenp@3602 553 SmallChunk = 512,
coleenp@3602 554 MediumChunk = 8 * K,
coleenp@3602 555 MediumChunkBunch = 4 * MediumChunk
coleenp@3602 556 };
coleenp@3602 557
coleenp@3602 558 // Accessors
coleenp@3602 559 size_t allocation_total() const { return _allocation_total; }
coleenp@3602 560 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); }
coleenp@3602 561 static bool is_humongous(size_t word_size) { return word_size > MediumChunk; }
coleenp@3602 562
coleenp@3602 563 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 564
coleenp@3602 565 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 566 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 567 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 568 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 569 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 570
coleenp@3602 571 size_t sum_count_in_chunks_in_use();
coleenp@3602 572 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 573
coleenp@3602 574 // Block allocation and deallocation.
coleenp@3602 575 // Allocates a block from the current chunk
coleenp@3602 576 MetaWord* allocate(size_t word_size);
coleenp@3602 577
coleenp@3602 578 // Helper for allocations
jmasa@3761 579 MetaWord* allocate_work(size_t word_size);
coleenp@3602 580
coleenp@3602 581 // Returns a block to the per manager freelist
jmasa@3761 582 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 583
coleenp@3602 584 // Based on the allocation size and a minimum chunk size,
coleenp@3602 585 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 586 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 587
coleenp@3602 588 // Called when an allocation from the current chunk fails.
coleenp@3602 589 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 590 // and allocates from that chunk.
jmasa@3761 591 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 592
coleenp@3602 593 // debugging support.
coleenp@3602 594
coleenp@3602 595 void dump(outputStream* const out) const;
coleenp@3602 596 void print_on(outputStream* st) const;
coleenp@3602 597 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 598
coleenp@3602 599 void verify();
coleenp@3602 600 #ifdef ASSERT
coleenp@3602 601 void mangle_freed_chunks();
coleenp@3602 602 void verify_allocation_total();
coleenp@3602 603 #endif
coleenp@3602 604 };
coleenp@3602 605
coleenp@3602 606 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 607
jmasa@3761 608
jmasa@3761 609
coleenp@3602 610 const char* SpaceManager::_expand_lock_name =
coleenp@3602 611 "SpaceManager chunk allocation lock";
coleenp@3602 612 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 613 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 614 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 615 SpaceManager::_expand_lock_name,
coleenp@3602 616 Mutex::_allow_vm_block_flag);
coleenp@3602 617
coleenp@3602 618 size_t Metachunk::_overhead =
coleenp@3602 619 Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord;
coleenp@3602 620
coleenp@3602 621 // New blocks returned by the Metaspace are zero initialized.
coleenp@3602 622 // We should fix the constructors to not assume this instead.
coleenp@3602 623 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) {
jmasa@3761 624 if (p == NULL) {
jmasa@3761 625 return NULL;
jmasa@3761 626 }
jmasa@3761 627
coleenp@3602 628 Metablock* result = (Metablock*) p;
coleenp@3602 629
coleenp@3602 630 // Clear the memory
coleenp@3602 631 Copy::fill_to_aligned_words((HeapWord*)result, word_size);
coleenp@3602 632 #ifdef ASSERT
coleenp@3602 633 result->set_word_size(word_size);
coleenp@3602 634 #endif
coleenp@3602 635 return result;
coleenp@3602 636 }
coleenp@3602 637
coleenp@3602 638 // Metachunk methods
coleenp@3602 639
coleenp@3602 640 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) {
coleenp@3602 641 // Set bottom, top, and end. Allow space for the Metachunk itself
coleenp@3602 642 Metachunk* chunk = (Metachunk*) ptr;
coleenp@3602 643
coleenp@3602 644 MetaWord* chunk_bottom = ptr + _overhead;
coleenp@3602 645 chunk->set_bottom(ptr);
coleenp@3602 646 chunk->set_top(chunk_bottom);
coleenp@3602 647 MetaWord* chunk_end = ptr + word_size;
coleenp@3602 648 assert(chunk_end > chunk_bottom, "Chunk must be too small");
coleenp@3602 649 chunk->set_end(chunk_end);
coleenp@3602 650 chunk->set_next(NULL);
coleenp@3602 651 chunk->set_word_size(word_size);
coleenp@3602 652 #ifdef ASSERT
coleenp@3602 653 size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord));
coleenp@3602 654 Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize);
coleenp@3602 655 #endif
coleenp@3602 656 return chunk;
coleenp@3602 657 }
coleenp@3602 658
coleenp@3602 659
jmasa@3761 660 MetaWord* Metachunk::allocate(size_t word_size) {
jmasa@3761 661 MetaWord* result = NULL;
coleenp@3602 662 // If available, bump the pointer to allocate.
coleenp@3602 663 if (free_word_size() >= word_size) {
jmasa@3761 664 result = _top;
coleenp@3602 665 _top = _top + word_size;
coleenp@3602 666 }
coleenp@3602 667 return result;
coleenp@3602 668 }
coleenp@3602 669
coleenp@3602 670 // _bottom points to the start of the chunk including the overhead.
coleenp@3602 671 size_t Metachunk::used_word_size() {
coleenp@3602 672 return pointer_delta(_top, _bottom, sizeof(MetaWord));
coleenp@3602 673 }
coleenp@3602 674
coleenp@3602 675 size_t Metachunk::free_word_size() {
coleenp@3602 676 return pointer_delta(_end, _top, sizeof(MetaWord));
coleenp@3602 677 }
coleenp@3602 678
coleenp@3602 679 size_t Metachunk::capacity_word_size() {
coleenp@3602 680 return pointer_delta(_end, _bottom, sizeof(MetaWord));
coleenp@3602 681 }
coleenp@3602 682
coleenp@3602 683 void Metachunk::print_on(outputStream* st) const {
coleenp@3602 684 st->print_cr("Metachunk:"
coleenp@3602 685 " bottom " PTR_FORMAT " top " PTR_FORMAT
coleenp@3602 686 " end " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 687 bottom(), top(), end(), word_size());
coleenp@3602 688 }
coleenp@3602 689
jmasa@3761 690 #ifdef ASSERT
jmasa@3761 691 void Metachunk::mangle() {
jmasa@3761 692 // Mangle the payload of the chunk and not the links that
jmasa@3761 693 // maintain list of chunks.
jmasa@3761 694 HeapWord* start = (HeapWord*)(bottom() + overhead());
jmasa@3761 695 size_t word_size = capacity_word_size() - overhead();
jmasa@3761 696 Copy::fill_to_words(start, word_size, metadata_chunk_initialize);
jmasa@3761 697 }
jmasa@3761 698 #endif // ASSERT
coleenp@3602 699
coleenp@3602 700 void Metachunk::verify() {
coleenp@3602 701 #ifdef ASSERT
coleenp@3602 702 // Cannot walk through the blocks unless the blocks have
coleenp@3602 703 // headers with sizes.
jmasa@3761 704 assert(_bottom <= _top &&
jmasa@3761 705 _top <= _end,
jmasa@3761 706 "Chunk has been smashed");
jmasa@3761 707 assert(SpaceManager::is_humongous(_word_size) ||
jmasa@3761 708 _word_size == SpaceManager::MediumChunk ||
jmasa@3761 709 _word_size == SpaceManager::SmallChunk,
jmasa@3761 710 "Chunk size is wrong");
coleenp@3602 711 #endif
coleenp@3602 712 return;
coleenp@3602 713 }
coleenp@3602 714
coleenp@3602 715 // BlockFreelist methods
coleenp@3602 716
coleenp@3602 717 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 718
coleenp@3602 719 BlockFreelist::~BlockFreelist() {
coleenp@3602 720 if (_dictionary != NULL) {
coleenp@3602 721 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 722 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 723 }
coleenp@3602 724 delete _dictionary;
coleenp@3602 725 }
coleenp@3602 726 }
coleenp@3602 727
jmasa@3761 728 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 729 Metablock* block = (Metablock*) p;
jmasa@3761 730 block->set_word_size(word_size);
jmasa@3761 731 block->set_prev(NULL);
jmasa@3761 732 block->set_next(NULL);
jmasa@3761 733
coleenp@3602 734 return block;
coleenp@3602 735 }
coleenp@3602 736
jmasa@3761 737 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 738 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 739 if (dictionary() == NULL) {
jmasa@3761 740 _dictionary = new BlockTreeDictionary();
coleenp@3602 741 }
jmasa@3761 742 dictionary()->return_chunk(free_chunk);
coleenp@3602 743 }
coleenp@3602 744
jmasa@3761 745 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 746 if (dictionary() == NULL) {
coleenp@3602 747 return NULL;
coleenp@3602 748 }
coleenp@3602 749
jmasa@3761 750 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 751 // Dark matter. Too small for dictionary.
coleenp@3602 752 return NULL;
coleenp@3602 753 }
jmasa@3761 754
jmasa@3761 755 Metablock* free_block =
jmasa@3761 756 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 757 if (free_block == NULL) {
jmasa@3761 758 return NULL;
jmasa@3761 759 }
jmasa@3761 760
jmasa@3761 761 return (MetaWord*) free_block;
coleenp@3602 762 }
coleenp@3602 763
coleenp@3602 764 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 765 if (dictionary() == NULL) {
coleenp@3602 766 return;
coleenp@3602 767 }
coleenp@3602 768 dictionary()->print_free_lists(st);
coleenp@3602 769 }
coleenp@3602 770
coleenp@3602 771 // VirtualSpaceNode methods
coleenp@3602 772
coleenp@3602 773 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 774 _rs.release();
coleenp@3602 775 }
coleenp@3602 776
coleenp@3602 777 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 778 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 779 }
coleenp@3602 780
coleenp@3602 781 // Space committed in the VirtualSpace
coleenp@3602 782 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 783 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 784 }
coleenp@3602 785
coleenp@3602 786
coleenp@3602 787 // Allocates the chunk from the virtual space only.
coleenp@3602 788 // This interface is also used internally for debugging. Not all
coleenp@3602 789 // chunks removed here are necessarily used for allocation.
coleenp@3602 790 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 791 // Bottom of the new chunk
coleenp@3602 792 MetaWord* chunk_limit = top();
coleenp@3602 793 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 794
coleenp@3602 795 if (!is_available(chunk_word_size)) {
coleenp@3602 796 if (TraceMetadataChunkAllocation) {
coleenp@3602 797 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 798 // Dump some information about the virtual space that is nearly full
coleenp@3602 799 print_on(tty);
coleenp@3602 800 }
coleenp@3602 801 return NULL;
coleenp@3602 802 }
coleenp@3602 803
coleenp@3602 804 // Take the space (bump top on the current virtual space).
coleenp@3602 805 inc_top(chunk_word_size);
coleenp@3602 806
coleenp@3602 807 // Point the chunk at the space
coleenp@3602 808 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size);
coleenp@3602 809 return result;
coleenp@3602 810 }
coleenp@3602 811
coleenp@3602 812
coleenp@3602 813 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 814 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 815 size_t bytes = words * BytesPerWord;
coleenp@3602 816 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 817 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 818 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 819 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 820 virtual_space()->print();
coleenp@3602 821 }
coleenp@3602 822 return result;
coleenp@3602 823 }
coleenp@3602 824
coleenp@3602 825 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 826 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 827 size_t bytes = words * BytesPerWord;
coleenp@3602 828 virtual_space()->shrink_by(bytes);
coleenp@3602 829 return true;
coleenp@3602 830 }
coleenp@3602 831
coleenp@3602 832 // Add another chunk to the chunk list.
coleenp@3602 833
coleenp@3602 834 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 835 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 836 Metachunk* result = NULL;
coleenp@3602 837
coleenp@3602 838 return take_from_committed(chunk_word_size);
coleenp@3602 839 }
coleenp@3602 840
coleenp@3602 841 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 842 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 843
coleenp@3602 844 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 845
coleenp@3602 846 if (new_chunk == NULL) {
coleenp@3602 847 // Only a small part of the virtualspace is committed when first
coleenp@3602 848 // allocated so committing more here can be expected.
coleenp@3602 849 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 850 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 851 page_size_words);
coleenp@3602 852 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 853 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 854 }
coleenp@3602 855 return new_chunk;
coleenp@3602 856 }
coleenp@3602 857
coleenp@3602 858 bool VirtualSpaceNode::initialize() {
coleenp@3602 859
coleenp@3602 860 if (!_rs.is_reserved()) {
coleenp@3602 861 return false;
coleenp@3602 862 }
coleenp@3602 863
coleenp@3602 864 // Commit only 1 page instead of the whole reserved space _rs.size()
coleenp@3602 865 size_t committed_byte_size = os::vm_page_size();
coleenp@3602 866 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 867 if (result) {
coleenp@3602 868 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 869 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 870 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 871
coleenp@3603 872 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 873 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 874 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 875 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 876 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 877 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 878 _rs.size() / BytesPerWord));
coleenp@3602 879 }
coleenp@3602 880
coleenp@3602 881 return result;
coleenp@3602 882 }
coleenp@3602 883
coleenp@3602 884 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 885 size_t used = used_words_in_vs();
coleenp@3602 886 size_t capacity = capacity_words_in_vs();
coleenp@3602 887 VirtualSpace* vs = virtual_space();
coleenp@3602 888 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 889 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 890 PTR_FORMAT ", " PTR_FORMAT ")",
coleenp@3602 891 vs, capacity / K, used * 100 / capacity,
coleenp@3602 892 bottom(), top(), end(),
coleenp@3602 893 vs->high_boundary());
coleenp@3602 894 }
coleenp@3602 895
coleenp@3602 896 void VirtualSpaceNode::mangle() {
coleenp@3602 897 size_t word_size = capacity_words_in_vs();
coleenp@3602 898 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 899 }
coleenp@3602 900
coleenp@3602 901 // VirtualSpaceList methods
coleenp@3602 902 // Space allocated from the VirtualSpace
coleenp@3602 903
coleenp@3602 904 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 905 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 906 while (iter.repeat()) {
coleenp@3602 907 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 908 delete vsl;
coleenp@3602 909 }
coleenp@3602 910 }
coleenp@3602 911
coleenp@3602 912 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 913 size_t allocated_by_vs = 0;
coleenp@3602 914 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 915 while (iter.repeat()) {
coleenp@3602 916 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 917 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 918 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 919 }
coleenp@3602 920 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 921 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 922 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 923 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 924 size_t used =
coleenp@3602 925 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 926 return used;
coleenp@3602 927 }
coleenp@3602 928
coleenp@3602 929 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 930 // for metadata. This is the upper limit on the capacity
coleenp@3602 931 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 932 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 933 size_t capacity = 0;
coleenp@3602 934 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 935 while (iter.repeat()) {
coleenp@3602 936 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 937 capacity += vsl->capacity_words_in_vs();
coleenp@3602 938 }
coleenp@3602 939 return capacity;
coleenp@3602 940 }
coleenp@3602 941
coleenp@3602 942 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 943 _is_class(false),
coleenp@3602 944 _virtual_space_list(NULL),
coleenp@3602 945 _current_virtual_space(NULL),
coleenp@3602 946 _virtual_space_total(0),
coleenp@3602 947 _virtual_space_count(0) {
coleenp@3602 948 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 949 Mutex::_no_safepoint_check_flag);
coleenp@3602 950 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 951
coleenp@3602 952 assert(initialization_succeeded,
coleenp@3602 953 " VirtualSpaceList initialization should not fail");
coleenp@3602 954 }
coleenp@3602 955
coleenp@3602 956 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 957 _is_class(true),
coleenp@3602 958 _virtual_space_list(NULL),
coleenp@3602 959 _current_virtual_space(NULL),
coleenp@3602 960 _virtual_space_total(0),
coleenp@3602 961 _virtual_space_count(0) {
coleenp@3602 962 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 963 Mutex::_no_safepoint_check_flag);
coleenp@3602 964 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 965 bool succeeded = class_entry->initialize();
coleenp@3602 966 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 967 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 968 }
coleenp@3602 969
coleenp@3602 970 // Allocate another meta virtual space and add it to the list.
coleenp@3602 971 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 972 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 973 if (vs_word_size == 0) {
coleenp@3602 974 return false;
coleenp@3602 975 }
coleenp@3602 976 // Reserve the space
coleenp@3602 977 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 978 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 979
coleenp@3602 980 // Allocate the meta virtual space and initialize it.
coleenp@3602 981 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 982 if (!new_entry->initialize()) {
coleenp@3602 983 delete new_entry;
coleenp@3602 984 return false;
coleenp@3602 985 } else {
coleenp@3602 986 link_vs(new_entry, vs_word_size);
coleenp@3602 987 return true;
coleenp@3602 988 }
coleenp@3602 989 }
coleenp@3602 990
coleenp@3602 991 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 992 if (virtual_space_list() == NULL) {
coleenp@3602 993 set_virtual_space_list(new_entry);
coleenp@3602 994 } else {
coleenp@3602 995 current_virtual_space()->set_next(new_entry);
coleenp@3602 996 }
coleenp@3602 997 set_current_virtual_space(new_entry);
coleenp@3602 998 inc_virtual_space_total(vs_word_size);
coleenp@3602 999 inc_virtual_space_count();
coleenp@3602 1000 #ifdef ASSERT
coleenp@3602 1001 new_entry->mangle();
coleenp@3602 1002 #endif
coleenp@3602 1003 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 1004 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 1005 vsl->print_on(tty);
coleenp@3602 1006 }
coleenp@3602 1007 }
coleenp@3602 1008
coleenp@3602 1009 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
coleenp@3602 1010 size_t grow_chunks_by_words) {
coleenp@3602 1011
coleenp@3602 1012 // Get a chunk from the chunk freelist
coleenp@3602 1013 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 1014
coleenp@3602 1015 // Allocate a chunk out of the current virtual space.
coleenp@3602 1016 if (next == NULL) {
coleenp@3602 1017 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1018 }
coleenp@3602 1019
coleenp@3602 1020 if (next == NULL) {
coleenp@3602 1021 // Not enough room in current virtual space. Try to commit
coleenp@3602 1022 // more space.
coleenp@3602 1023 size_t expand_vs_by_words = MAX2((size_t)SpaceManager::MediumChunkBunch,
coleenp@3602 1024 grow_chunks_by_words);
coleenp@3602 1025 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1026 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 1027 page_size_words);
coleenp@3602 1028 bool vs_expanded =
coleenp@3602 1029 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 1030 if (!vs_expanded) {
coleenp@3602 1031 // Should the capacity of the metaspaces be expanded for
coleenp@3602 1032 // this allocation? If it's the virtual space for classes and is
coleenp@3602 1033 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 1034 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 1035 // Get another virtual space.
coleenp@3602 1036 size_t grow_vs_words =
coleenp@3602 1037 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 1038 if (grow_vs(grow_vs_words)) {
coleenp@3602 1039 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 1040 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 1041 }
coleenp@3602 1042 if (TraceMetadataHumongousAllocation && SpaceManager::is_humongous(word_size)) {
coleenp@3602 1043 gclog_or_tty->print_cr(" aligned_expand_vs_by_words " PTR_FORMAT,
coleenp@3602 1044 aligned_expand_vs_by_words);
coleenp@3602 1045 gclog_or_tty->print_cr(" grow_vs_words " PTR_FORMAT,
coleenp@3602 1046 grow_vs_words);
coleenp@3602 1047 }
coleenp@3602 1048 } else {
coleenp@3602 1049 // Allocation will fail and induce a GC
coleenp@3602 1050 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1051 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 1052 " Fail instead of expand the metaspace");
coleenp@3602 1053 }
coleenp@3602 1054 }
coleenp@3602 1055 } else {
coleenp@3602 1056 // The virtual space expanded, get a new chunk
coleenp@3602 1057 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1058 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 1059 }
coleenp@3602 1060 }
coleenp@3602 1061
coleenp@3602 1062 return next;
coleenp@3602 1063 }
coleenp@3602 1064
coleenp@3602 1065 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1066 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1067 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1068 while (iter.repeat()) {
coleenp@3602 1069 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1070 node->print_on(st);
coleenp@3602 1071 }
coleenp@3602 1072 }
coleenp@3602 1073 }
coleenp@3602 1074
coleenp@3602 1075 #ifndef PRODUCT
coleenp@3602 1076 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1077 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1078 VirtualSpaceListIterator iter(list);
coleenp@3602 1079 while (iter.repeat()) {
coleenp@3602 1080 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1081 if (node->reserved()->contains(ptr)) {
coleenp@3602 1082 return true;
coleenp@3602 1083 }
coleenp@3602 1084 }
coleenp@3602 1085 return false;
coleenp@3602 1086 }
coleenp@3602 1087 #endif // PRODUCT
coleenp@3602 1088
coleenp@3602 1089
coleenp@3602 1090 // MetaspaceGC methods
coleenp@3602 1091
coleenp@3602 1092 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1093 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1094 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1095 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1096 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1097 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1098 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1099 //
coleenp@3602 1100 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1101 // resize the capacity of the metaspaces. The current implementation
coleenp@3602 1102 // is based on the flags MinHeapFreeRatio and MaxHeapFreeRatio used
coleenp@3602 1103 // to resize the Java heap by some GC's. New flags can be implemented
coleenp@3602 1104 // if really needed. MinHeapFreeRatio is used to calculate how much
coleenp@3602 1105 // free space is desirable in the metaspace capacity to decide how much
coleenp@3602 1106 // to increase the HWM. MaxHeapFreeRatio is used to decide how much
coleenp@3602 1107 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1108 // the HWM.
coleenp@3602 1109
coleenp@3602 1110 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1111 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1112 // another expansion is not requested too soon. If that is not
coleenp@3602 1113 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1114 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1115 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1116 // some.
coleenp@3602 1117 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1118 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1119 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1120 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1121 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1122 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1123 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1124 if (delta_words > min_delta_words) {
coleenp@3602 1125 // Don't want to hit the high water mark on the next
coleenp@3602 1126 // allocation so make the delta greater than just enough
coleenp@3602 1127 // for this allocation.
coleenp@3602 1128 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1129 if (delta_words > max_delta_words) {
coleenp@3602 1130 // This allocation is large but the next ones are probably not
coleenp@3602 1131 // so increase by the minimum.
coleenp@3602 1132 delta_words = delta_words + min_delta_words;
coleenp@3602 1133 }
coleenp@3602 1134 }
coleenp@3602 1135 return delta_words;
coleenp@3602 1136 }
coleenp@3602 1137
coleenp@3602 1138 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
coleenp@3602 1139
coleenp@3602 1140 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1141 // metadata virtual space.
coleenp@3602 1142 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1143
coleenp@3602 1144 // If the user wants a limit, impose one.
coleenp@3602 1145 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord;
coleenp@3602 1146 size_t metaspace_size_words = MetaspaceSize / BytesPerWord;
coleenp@3602 1147 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
coleenp@3602 1148 vsl->capacity_words_sum() >= max_metaspace_size_words) {
coleenp@3602 1149 return false;
coleenp@3602 1150 }
coleenp@3602 1151
coleenp@3602 1152 // If this is part of an allocation after a GC, expand
coleenp@3602 1153 // unconditionally.
coleenp@3602 1154 if(MetaspaceGC::expand_after_GC()) {
coleenp@3602 1155 return true;
coleenp@3602 1156 }
coleenp@3602 1157
coleenp@3602 1158 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1159 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1160 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1161 // until that minimum capacity is exceeded.
coleenp@3602 1162 if (vsl->capacity_words_sum() < metaspace_size_words ||
coleenp@3602 1163 capacity_until_GC() == 0) {
coleenp@3602 1164 set_capacity_until_GC(metaspace_size_words);
coleenp@3602 1165 return true;
coleenp@3602 1166 } else {
coleenp@3602 1167 if (vsl->capacity_words_sum() < capacity_until_GC()) {
coleenp@3602 1168 return true;
coleenp@3602 1169 } else {
coleenp@3602 1170 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1171 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1172 " capacity_until_GC " SIZE_FORMAT
coleenp@3602 1173 " capacity_words_sum " SIZE_FORMAT
coleenp@3602 1174 " used_words_sum " SIZE_FORMAT
coleenp@3602 1175 " free chunks " SIZE_FORMAT
coleenp@3602 1176 " free chunks count %d",
coleenp@3602 1177 word_size,
coleenp@3602 1178 capacity_until_GC(),
coleenp@3602 1179 vsl->capacity_words_sum(),
coleenp@3602 1180 vsl->used_words_sum(),
coleenp@3602 1181 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1182 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1183 }
coleenp@3602 1184 return false;
coleenp@3602 1185 }
coleenp@3602 1186 }
coleenp@3602 1187 }
coleenp@3602 1188
coleenp@3602 1189 // Variables are in bytes
coleenp@3602 1190
coleenp@3602 1191 void MetaspaceGC::compute_new_size() {
coleenp@3602 1192 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1193 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1194 _shrink_factor = 0;
coleenp@3602 1195
coleenp@3602 1196 VirtualSpaceList *vsl = Metaspace::space_list();
coleenp@3602 1197
coleenp@3602 1198 size_t capacity_after_gc = vsl->capacity_bytes_sum();
coleenp@3602 1199 // Check to see if these two can be calculated without walking the CLDG
coleenp@3602 1200 size_t used_after_gc = vsl->used_bytes_sum();
coleenp@3602 1201 size_t capacity_until_GC = vsl->capacity_bytes_sum();
coleenp@3602 1202 size_t free_after_gc = capacity_until_GC - used_after_gc;
coleenp@3602 1203
coleenp@3602 1204 const double minimum_free_percentage = MinHeapFreeRatio / 100.0;
coleenp@3602 1205 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1206
coleenp@3602 1207 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1208 size_t minimum_desired_capacity =
coleenp@3602 1209 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1210 // Don't shrink less than the initial generation size
coleenp@3602 1211 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1212 MetaspaceSize);
coleenp@3602 1213
coleenp@3602 1214 if (PrintGCDetails && Verbose) {
coleenp@3602 1215 const double free_percentage = ((double)free_after_gc) / capacity_until_GC;
coleenp@3602 1216 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1217 gclog_or_tty->print_cr(" "
coleenp@3602 1218 " minimum_free_percentage: %6.2f"
coleenp@3602 1219 " maximum_used_percentage: %6.2f",
coleenp@3602 1220 minimum_free_percentage,
coleenp@3602 1221 maximum_used_percentage);
coleenp@3602 1222 double d_free_after_gc = free_after_gc / (double) K;
coleenp@3602 1223 gclog_or_tty->print_cr(" "
coleenp@3602 1224 " free_after_gc : %6.1fK"
coleenp@3602 1225 " used_after_gc : %6.1fK"
coleenp@3602 1226 " capacity_after_gc : %6.1fK"
coleenp@3602 1227 " metaspace HWM : %6.1fK",
coleenp@3602 1228 free_after_gc / (double) K,
coleenp@3602 1229 used_after_gc / (double) K,
coleenp@3602 1230 capacity_after_gc / (double) K,
coleenp@3602 1231 capacity_until_GC / (double) K);
coleenp@3602 1232 gclog_or_tty->print_cr(" "
coleenp@3602 1233 " free_percentage: %6.2f",
coleenp@3602 1234 free_percentage);
coleenp@3602 1235 }
coleenp@3602 1236
coleenp@3602 1237
coleenp@3602 1238 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1239 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1240 // increment the HWM.
coleenp@3602 1241 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1242 // Don't expand unless it's significant
coleenp@3602 1243 if (expand_bytes >= MinMetaspaceExpansion) {
coleenp@3602 1244 size_t expand_words = expand_bytes / BytesPerWord;
coleenp@3602 1245 MetaspaceGC::inc_capacity_until_GC(expand_words);
coleenp@3602 1246 }
coleenp@3602 1247 if (PrintGCDetails && Verbose) {
coleenp@3602 1248 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1249 gclog_or_tty->print_cr(" expanding:"
coleenp@3602 1250 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1251 " expand_words: %6.1fK"
coleenp@3602 1252 " MinMetaspaceExpansion: %6.1fK"
coleenp@3602 1253 " new metaspace HWM: %6.1fK",
coleenp@3602 1254 minimum_desired_capacity / (double) K,
coleenp@3602 1255 expand_bytes / (double) K,
coleenp@3602 1256 MinMetaspaceExpansion / (double) K,
coleenp@3602 1257 new_capacity_until_GC / (double) K);
coleenp@3602 1258 }
coleenp@3602 1259 return;
coleenp@3602 1260 }
coleenp@3602 1261
coleenp@3602 1262 // No expansion, now see if we want to shrink
coleenp@3602 1263 size_t shrink_words = 0;
coleenp@3602 1264 // We would never want to shrink more than this
coleenp@3602 1265 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity;
coleenp@3602 1266 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT,
coleenp@3602 1267 max_shrink_words));
coleenp@3602 1268
coleenp@3602 1269 // Should shrinking be considered?
coleenp@3602 1270 if (MaxHeapFreeRatio < 100) {
coleenp@3602 1271 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0;
coleenp@3602 1272 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1273 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1274 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1275 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1276 MetaspaceSize);
coleenp@3602 1277 if (PrintGC && Verbose) {
coleenp@3602 1278 gclog_or_tty->print_cr(" "
coleenp@3602 1279 " maximum_free_percentage: %6.2f"
coleenp@3602 1280 " minimum_used_percentage: %6.2f",
coleenp@3602 1281 maximum_free_percentage,
coleenp@3602 1282 minimum_used_percentage);
coleenp@3602 1283 gclog_or_tty->print_cr(" "
coleenp@3602 1284 " capacity_until_GC: %6.1fK"
coleenp@3602 1285 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1286 " maximum_desired_capacity: %6.1fK",
coleenp@3602 1287 capacity_until_GC / (double) K,
coleenp@3602 1288 minimum_desired_capacity / (double) K,
coleenp@3602 1289 maximum_desired_capacity / (double) K);
coleenp@3602 1290 }
coleenp@3602 1291
coleenp@3602 1292 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1293 "sanity check");
coleenp@3602 1294
coleenp@3602 1295 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1296 // Capacity too large, compute shrinking size
coleenp@3602 1297 shrink_words = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1298 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1299 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1300 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1301 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1302 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1303 // size without shrinking, it goes back to 0%.
coleenp@3602 1304 shrink_words = shrink_words / 100 * current_shrink_factor;
coleenp@3602 1305 assert(shrink_words <= max_shrink_words,
coleenp@3602 1306 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
coleenp@3602 1307 shrink_words, max_shrink_words));
coleenp@3602 1308 if (current_shrink_factor == 0) {
coleenp@3602 1309 _shrink_factor = 10;
coleenp@3602 1310 } else {
coleenp@3602 1311 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1312 }
coleenp@3602 1313 if (PrintGCDetails && Verbose) {
coleenp@3602 1314 gclog_or_tty->print_cr(" "
coleenp@3602 1315 " shrinking:"
coleenp@3602 1316 " initSize: %.1fK"
coleenp@3602 1317 " maximum_desired_capacity: %.1fK",
coleenp@3602 1318 MetaspaceSize / (double) K,
coleenp@3602 1319 maximum_desired_capacity / (double) K);
coleenp@3602 1320 gclog_or_tty->print_cr(" "
coleenp@3602 1321 " shrink_words: %.1fK"
coleenp@3602 1322 " current_shrink_factor: %d"
coleenp@3602 1323 " new shrink factor: %d"
coleenp@3602 1324 " MinMetaspaceExpansion: %.1fK",
coleenp@3602 1325 shrink_words / (double) K,
coleenp@3602 1326 current_shrink_factor,
coleenp@3602 1327 _shrink_factor,
coleenp@3602 1328 MinMetaspaceExpansion / (double) K);
coleenp@3602 1329 }
coleenp@3602 1330 }
coleenp@3602 1331 }
coleenp@3602 1332
coleenp@3602 1333
coleenp@3602 1334 // Don't shrink unless it's significant
coleenp@3602 1335 if (shrink_words >= MinMetaspaceExpansion) {
coleenp@3602 1336 VirtualSpaceNode* csp = vsl->current_virtual_space();
coleenp@3602 1337 size_t available_to_shrink = csp->capacity_words_in_vs() -
coleenp@3602 1338 csp->used_words_in_vs();
coleenp@3602 1339 shrink_words = MIN2(shrink_words, available_to_shrink);
coleenp@3602 1340 csp->shrink_by(shrink_words);
coleenp@3602 1341 MetaspaceGC::dec_capacity_until_GC(shrink_words);
coleenp@3602 1342 if (PrintGCDetails && Verbose) {
coleenp@3602 1343 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1344 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K);
coleenp@3602 1345 }
coleenp@3602 1346 }
coleenp@3602 1347 assert(vsl->used_bytes_sum() == used_after_gc &&
coleenp@3602 1348 used_after_gc <= vsl->capacity_bytes_sum(),
coleenp@3602 1349 "sanity check");
coleenp@3602 1350
coleenp@3602 1351 }
coleenp@3602 1352
coleenp@3602 1353 // Metadebug methods
coleenp@3602 1354
coleenp@3602 1355 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1356 size_t chunk_word_size){
coleenp@3602 1357 #ifdef ASSERT
coleenp@3602 1358 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1359 if (MetaDataDeallocateALot &&
coleenp@3602 1360 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1361 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1362 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1363 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1364 if (dummy_chunk == NULL) {
coleenp@3602 1365 break;
coleenp@3602 1366 }
coleenp@3602 1367 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1368
coleenp@3602 1369 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1370 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1371 sm->sum_count_in_chunks_in_use());
coleenp@3602 1372 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1373 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1374 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1375 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1376 }
coleenp@3602 1377 }
coleenp@3602 1378 } else {
coleenp@3602 1379 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1380 }
coleenp@3602 1381 #endif
coleenp@3602 1382 }
coleenp@3602 1383
coleenp@3602 1384 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1385 size_t raw_word_size){
coleenp@3602 1386 #ifdef ASSERT
coleenp@3602 1387 if (MetaDataDeallocateALot &&
coleenp@3602 1388 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1389 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1390 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1391 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1392 if (dummy_block == 0) {
coleenp@3602 1393 break;
coleenp@3602 1394 }
jmasa@3761 1395 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1396 }
coleenp@3602 1397 } else {
coleenp@3602 1398 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1399 }
coleenp@3602 1400 #endif
coleenp@3602 1401 }
coleenp@3602 1402
coleenp@3602 1403 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1404 if (MetadataAllocationFailALot) {
coleenp@3602 1405 _allocation_fail_alot_count =
coleenp@3602 1406 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1407 }
coleenp@3602 1408 }
coleenp@3602 1409
coleenp@3602 1410 #ifdef ASSERT
coleenp@3602 1411 bool Metadebug::test_metadata_failure() {
coleenp@3602 1412 if (MetadataAllocationFailALot &&
coleenp@3602 1413 Threads::is_vm_complete()) {
coleenp@3602 1414 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1415 _allocation_fail_alot_count--;
coleenp@3602 1416 } else {
coleenp@3602 1417 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1418 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1419 "MetadataAllocationFailALot");
coleenp@3602 1420 }
coleenp@3602 1421 init_allocation_fail_alot_count();
coleenp@3602 1422 return true;
coleenp@3602 1423 }
coleenp@3602 1424 }
coleenp@3602 1425 return false;
coleenp@3602 1426 }
coleenp@3602 1427 #endif
coleenp@3602 1428
coleenp@3602 1429 // ChunkList methods
coleenp@3602 1430
coleenp@3602 1431 size_t ChunkList::sum_list_size() {
coleenp@3602 1432 size_t result = 0;
coleenp@3602 1433 Metachunk* cur = head();
coleenp@3602 1434 while (cur != NULL) {
coleenp@3602 1435 result += cur->word_size();
coleenp@3602 1436 cur = cur->next();
coleenp@3602 1437 }
coleenp@3602 1438 return result;
coleenp@3602 1439 }
coleenp@3602 1440
coleenp@3602 1441 size_t ChunkList::sum_list_count() {
coleenp@3602 1442 size_t result = 0;
coleenp@3602 1443 Metachunk* cur = head();
coleenp@3602 1444 while (cur != NULL) {
coleenp@3602 1445 result++;
coleenp@3602 1446 cur = cur->next();
coleenp@3602 1447 }
coleenp@3602 1448 return result;
coleenp@3602 1449 }
coleenp@3602 1450
coleenp@3602 1451 size_t ChunkList::sum_list_capacity() {
coleenp@3602 1452 size_t result = 0;
coleenp@3602 1453 Metachunk* cur = head();
coleenp@3602 1454 while (cur != NULL) {
coleenp@3602 1455 result += cur->capacity_word_size();
coleenp@3602 1456 cur = cur->next();
coleenp@3602 1457 }
coleenp@3602 1458 return result;
coleenp@3602 1459 }
coleenp@3602 1460
coleenp@3602 1461 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) {
coleenp@3602 1462 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1463 assert(tail->next() == NULL, "Not the tail");
coleenp@3602 1464
coleenp@3602 1465 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1466 tty->print("ChunkList::add_at_head: ");
coleenp@3602 1467 Metachunk* cur = head;
coleenp@3602 1468 while (cur != NULL) {
coleenp@3602 1469 tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size());
coleenp@3602 1470 cur = cur->next();
coleenp@3602 1471 }
coleenp@3602 1472 tty->print_cr("");
coleenp@3602 1473 }
coleenp@3602 1474
coleenp@3602 1475 if (tail != NULL) {
coleenp@3602 1476 tail->set_next(_head);
coleenp@3602 1477 }
coleenp@3602 1478 set_head(head);
coleenp@3602 1479 }
coleenp@3602 1480
coleenp@3602 1481 void ChunkList::add_at_head(Metachunk* list) {
coleenp@3602 1482 if (list == NULL) {
coleenp@3602 1483 // Nothing to add
coleenp@3602 1484 return;
coleenp@3602 1485 }
coleenp@3602 1486 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1487 Metachunk* head = list;
coleenp@3602 1488 Metachunk* tail = list;
coleenp@3602 1489 Metachunk* cur = head->next();
coleenp@3602 1490 // Search for the tail since it is not passed.
coleenp@3602 1491 while (cur != NULL) {
coleenp@3602 1492 tail = cur;
coleenp@3602 1493 cur = cur->next();
coleenp@3602 1494 }
coleenp@3602 1495 add_at_head(head, tail);
coleenp@3602 1496 }
coleenp@3602 1497
coleenp@3602 1498 // ChunkManager methods
coleenp@3602 1499
coleenp@3602 1500 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1501 // work with the CMS collector because its use of additional locks
coleenp@3602 1502 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1503 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1504
coleenp@3602 1505 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1506 #ifdef ASSERT
coleenp@3602 1507 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1508 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1509 Mutex::_no_safepoint_check_flag);
coleenp@3602 1510 locked_verify_free_chunks_total();
coleenp@3602 1511 }
coleenp@3602 1512 #endif
coleenp@3602 1513 return _free_chunks_total;
coleenp@3602 1514 }
coleenp@3602 1515
coleenp@3602 1516 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1517 return free_chunks_total() * BytesPerWord;
coleenp@3602 1518 }
coleenp@3602 1519
coleenp@3602 1520 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1521 #ifdef ASSERT
coleenp@3602 1522 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1523 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1524 Mutex::_no_safepoint_check_flag);
coleenp@3602 1525 // This lock is only needed in debug because the verification
coleenp@3602 1526 // of the _free_chunks_totals walks the list of free chunks
coleenp@3602 1527 locked_verify_free_chunks_count();
coleenp@3602 1528 }
coleenp@3602 1529 #endif
coleenp@3602 1530 return _free_chunks_count;
coleenp@3602 1531 }
coleenp@3602 1532
coleenp@3602 1533 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1534 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1535 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1536 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1537 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1538 sum_free_chunks()));
coleenp@3602 1539 }
coleenp@3602 1540
coleenp@3602 1541 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1542 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1543 Mutex::_no_safepoint_check_flag);
coleenp@3602 1544 locked_verify_free_chunks_total();
coleenp@3602 1545 }
coleenp@3602 1546
coleenp@3602 1547 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1548 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1549 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1550 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1551 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1552 sum_free_chunks_count()));
coleenp@3602 1553 }
coleenp@3602 1554
coleenp@3602 1555 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1556 #ifdef ASSERT
coleenp@3602 1557 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1558 Mutex::_no_safepoint_check_flag);
coleenp@3602 1559 locked_verify_free_chunks_count();
coleenp@3602 1560 #endif
coleenp@3602 1561 }
coleenp@3602 1562
coleenp@3602 1563 void ChunkManager::verify() {
coleenp@3602 1564 #ifdef ASSERT
coleenp@3602 1565 if (!UseConcMarkSweepGC) {
coleenp@3602 1566 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1567 Mutex::_no_safepoint_check_flag);
coleenp@3602 1568 locked_verify_free_chunks_total();
coleenp@3602 1569 locked_verify_free_chunks_count();
coleenp@3602 1570 }
coleenp@3602 1571 #endif
coleenp@3602 1572 }
coleenp@3602 1573
coleenp@3602 1574 void ChunkManager::locked_verify() {
jmasa@3761 1575 locked_verify_free_chunks_count();
coleenp@3602 1576 locked_verify_free_chunks_total();
coleenp@3602 1577 }
coleenp@3602 1578
coleenp@3602 1579 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1580 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1581 st->print_cr("Free chunk total 0x%x count 0x%x",
coleenp@3602 1582 _free_chunks_total, _free_chunks_count);
coleenp@3602 1583 }
coleenp@3602 1584
coleenp@3602 1585 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1586 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1587 st->print_cr("Sum free chunk total 0x%x count 0x%x",
coleenp@3602 1588 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1589 }
coleenp@3602 1590 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1591 return &_free_chunks[index];
coleenp@3602 1592 }
coleenp@3602 1593
coleenp@3602 1594 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1595 // methods that are used in product builds.
coleenp@3602 1596 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1597 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1598 size_t result = 0;
coleenp@3602 1599 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1600 ChunkList* list = free_chunks(i);
coleenp@3602 1601
coleenp@3602 1602 if (list == NULL) {
coleenp@3602 1603 continue;
coleenp@3602 1604 }
coleenp@3602 1605
coleenp@3602 1606 result = result + list->sum_list_capacity();
coleenp@3602 1607 }
jmasa@3761 1608 result = result + humongous_dictionary()->total_size();
coleenp@3602 1609 return result;
coleenp@3602 1610 }
coleenp@3602 1611
coleenp@3602 1612 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1613 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1614 size_t count = 0;
coleenp@3602 1615 for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1616 ChunkList* list = free_chunks(i);
coleenp@3602 1617 if (list == NULL) {
coleenp@3602 1618 continue;
coleenp@3602 1619 }
coleenp@3602 1620 count = count + list->sum_list_count();
coleenp@3602 1621 }
jmasa@3761 1622 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1623 return count;
coleenp@3602 1624 }
coleenp@3602 1625
coleenp@3602 1626 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
coleenp@3602 1627 switch (word_size) {
coleenp@3602 1628 case SpaceManager::SmallChunk :
coleenp@3602 1629 return &_free_chunks[0];
coleenp@3602 1630 case SpaceManager::MediumChunk :
coleenp@3602 1631 return &_free_chunks[1];
coleenp@3602 1632 default:
coleenp@3602 1633 assert(word_size > SpaceManager::MediumChunk, "List inconsistency");
coleenp@3602 1634 return &_free_chunks[2];
coleenp@3602 1635 }
coleenp@3602 1636 }
coleenp@3602 1637
coleenp@3602 1638 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1639 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1640 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1641 chunk->set_next(free_list->head());
coleenp@3602 1642 free_list->set_head(chunk);
coleenp@3602 1643 // chunk is being returned to the chunk free list
coleenp@3602 1644 inc_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1645 locked_verify();
coleenp@3602 1646 }
coleenp@3602 1647
coleenp@3602 1648 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1649 // The deallocation of a chunk originates in the freelist
coleenp@3602 1650 // manangement code for a Metaspace and does not hold the
coleenp@3602 1651 // lock.
coleenp@3602 1652 assert(chunk != NULL, "Deallocating NULL");
coleenp@3602 1653 // MutexLockerEx fcl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1654 locked_verify();
coleenp@3602 1655 if (TraceMetadataChunkAllocation) {
coleenp@3602 1656 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1657 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1658 chunk, chunk->word_size());
coleenp@3602 1659 }
coleenp@3602 1660 free_chunks_put(chunk);
coleenp@3602 1661 }
coleenp@3602 1662
coleenp@3602 1663 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1664 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1665
coleenp@3602 1666 locked_verify();
jmasa@3761 1667
jmasa@3761 1668 Metachunk* chunk = NULL;
jmasa@3761 1669 if (!SpaceManager::is_humongous(word_size)) {
jmasa@3761 1670 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1671 assert(free_list != NULL, "Sanity check");
jmasa@3761 1672
jmasa@3761 1673 chunk = free_list->head();
jmasa@3761 1674 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1675
jmasa@3761 1676 if (chunk == NULL) {
jmasa@3761 1677 return NULL;
jmasa@3761 1678 }
jmasa@3761 1679
coleenp@3602 1680 // Remove the chunk as the head of the list.
coleenp@3602 1681 free_list->set_head(chunk->next());
coleenp@3602 1682 chunk->set_next(NULL);
jmasa@3761 1683 // Chunk has been removed from the chunks free list.
jmasa@3761 1684 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1685
coleenp@3602 1686 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1687 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1688 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1689 free_list, chunk, chunk->word_size());
coleenp@3602 1690 }
coleenp@3602 1691 } else {
jmasa@3761 1692 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1693 word_size,
jmasa@3761 1694 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1695
jmasa@3761 1696 if (chunk != NULL) {
jmasa@3761 1697 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1698 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1699 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1700 " for requested size " SIZE_FORMAT
jmasa@3761 1701 " waste " SIZE_FORMAT,
jmasa@3761 1702 chunk->word_size(), word_size, waste);
coleenp@3602 1703 }
jmasa@3761 1704 // Chunk is being removed from the chunks free list.
jmasa@3761 1705 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3761 1706 #ifdef ASSERT
jmasa@3761 1707 chunk->set_is_free(false);
jmasa@3761 1708 #endif
coleenp@3602 1709 }
coleenp@3602 1710 }
coleenp@3602 1711 locked_verify();
coleenp@3602 1712 return chunk;
coleenp@3602 1713 }
coleenp@3602 1714
coleenp@3602 1715 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1716 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1717 locked_verify();
coleenp@3602 1718
coleenp@3602 1719 // Take from the beginning of the list
coleenp@3602 1720 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1721 if (chunk == NULL) {
coleenp@3602 1722 return NULL;
coleenp@3602 1723 }
coleenp@3602 1724
coleenp@3602 1725 assert(word_size <= chunk->word_size() ||
coleenp@3602 1726 SpaceManager::is_humongous(chunk->word_size()),
coleenp@3602 1727 "Non-humongous variable sized chunk");
coleenp@3602 1728 if (TraceMetadataChunkAllocation) {
coleenp@3602 1729 tty->print("ChunkManager::chunk_freelist_allocate: chunk "
coleenp@3602 1730 PTR_FORMAT " size " SIZE_FORMAT " ",
coleenp@3602 1731 chunk, chunk->word_size());
coleenp@3602 1732 locked_print_free_chunks(tty);
coleenp@3602 1733 }
coleenp@3602 1734
coleenp@3602 1735 return chunk;
coleenp@3602 1736 }
coleenp@3602 1737
jmasa@3761 1738 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1739 if (PrintFLSStatistics != 0) {
jmasa@3761 1740 humongous_dictionary()->report_statistics();
jmasa@3761 1741 }
jmasa@3761 1742 }
jmasa@3761 1743
coleenp@3602 1744 // SpaceManager methods
coleenp@3602 1745
coleenp@3602 1746 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1747 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1748 size_t free = 0;
jmasa@3761 1749 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1750 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1751 while (chunk != NULL) {
coleenp@3602 1752 free += chunk->free_word_size();
coleenp@3602 1753 chunk = chunk->next();
coleenp@3602 1754 }
coleenp@3602 1755 }
coleenp@3602 1756 return free;
coleenp@3602 1757 }
coleenp@3602 1758
coleenp@3602 1759 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1760 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1761 size_t result = 0;
jmasa@3761 1762 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3761 1763
jmasa@3761 1764
coleenp@3602 1765 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1766 }
jmasa@3761 1767
coleenp@3602 1768 return result;
coleenp@3602 1769 }
coleenp@3602 1770
coleenp@3602 1771 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1772 size_t result = 0;
coleenp@3602 1773 size_t count = 0;
coleenp@3602 1774 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1775 // Count the free space in all the chunk but not the
coleenp@3602 1776 // current chunk from which allocations are still being done.
coleenp@3602 1777 if (chunk != NULL) {
jmasa@3761 1778 Metachunk* prev = chunk;
jmasa@3761 1779 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1780 result += chunk->free_word_size();
jmasa@3761 1781 prev = chunk;
coleenp@3602 1782 chunk = chunk->next();
coleenp@3602 1783 count++;
coleenp@3602 1784 }
coleenp@3602 1785 }
coleenp@3602 1786 return result;
coleenp@3602 1787 }
coleenp@3602 1788
coleenp@3602 1789 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
coleenp@3602 1790 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1791 size_t sum = 0;
jmasa@3761 1792 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1793 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1794 while (chunk != NULL) {
coleenp@3602 1795 // Just changed this sum += chunk->capacity_word_size();
coleenp@3602 1796 // sum += chunk->word_size() - Metachunk::overhead();
coleenp@3602 1797 sum += chunk->capacity_word_size();
coleenp@3602 1798 chunk = chunk->next();
coleenp@3602 1799 }
coleenp@3602 1800 }
coleenp@3602 1801 return sum;
coleenp@3602 1802 }
coleenp@3602 1803
coleenp@3602 1804 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1805 size_t count = 0;
jmasa@3761 1806 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1807 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1808 }
jmasa@3761 1809
coleenp@3602 1810 return count;
coleenp@3602 1811 }
coleenp@3602 1812
coleenp@3602 1813 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1814 size_t count = 0;
coleenp@3602 1815 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1816 while (chunk != NULL) {
coleenp@3602 1817 count++;
coleenp@3602 1818 chunk = chunk->next();
coleenp@3602 1819 }
coleenp@3602 1820 return count;
coleenp@3602 1821 }
coleenp@3602 1822
coleenp@3602 1823
coleenp@3602 1824 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1825 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1826 size_t used = 0;
jmasa@3761 1827 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1828 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1829 while (chunk != NULL) {
coleenp@3602 1830 used += chunk->used_word_size();
coleenp@3602 1831 chunk = chunk->next();
coleenp@3602 1832 }
coleenp@3602 1833 }
coleenp@3602 1834 return used;
coleenp@3602 1835 }
coleenp@3602 1836
coleenp@3602 1837 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1838
coleenp@3602 1839 Metachunk* small_chunk = chunks_in_use(SmallIndex);
coleenp@3602 1840 st->print_cr("SpaceManager: small chunk " PTR_FORMAT
coleenp@3602 1841 " free " SIZE_FORMAT,
coleenp@3602 1842 small_chunk,
coleenp@3602 1843 small_chunk->free_word_size());
coleenp@3602 1844
coleenp@3602 1845 Metachunk* medium_chunk = chunks_in_use(MediumIndex);
coleenp@3602 1846 st->print("medium chunk " PTR_FORMAT, medium_chunk);
coleenp@3602 1847 Metachunk* tail = current_chunk();
coleenp@3602 1848 st->print_cr(" current chunk " PTR_FORMAT, tail);
coleenp@3602 1849
coleenp@3602 1850 Metachunk* head = chunks_in_use(HumongousIndex);
coleenp@3602 1851 st->print_cr("humongous chunk " PTR_FORMAT, head);
coleenp@3602 1852
coleenp@3602 1853 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1854 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1855 }
coleenp@3602 1856
coleenp@3602 1857 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1858
coleenp@3602 1859 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1860 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1861 // once a medium chunk has been allocated, no more small
coleenp@3602 1862 // chunks will be allocated.
coleenp@3602 1863 size_t chunk_word_size;
coleenp@3602 1864 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1865 (!has_small_chunk_limit() ||
coleenp@3602 1866 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
coleenp@3602 1867 chunk_word_size = (size_t) SpaceManager::SmallChunk;
coleenp@3602 1868 if (word_size + Metachunk::overhead() > SpaceManager::SmallChunk) {
coleenp@3602 1869 chunk_word_size = MediumChunk;
coleenp@3602 1870 }
coleenp@3602 1871 } else {
coleenp@3602 1872 chunk_word_size = MediumChunk;
coleenp@3602 1873 }
coleenp@3602 1874
coleenp@3602 1875 // Might still need a humongous chunk
coleenp@3602 1876 chunk_word_size =
coleenp@3602 1877 MAX2((size_t) chunk_word_size, word_size + Metachunk::overhead());
coleenp@3602 1878
coleenp@3602 1879 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1880 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1881 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1882 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1883 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1884 chunk_word_size);
jmasa@3761 1885 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1886 Metachunk::overhead());
coleenp@3602 1887 }
coleenp@3602 1888 return chunk_word_size;
coleenp@3602 1889 }
coleenp@3602 1890
jmasa@3761 1891 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1892 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1893 "Should have been set");
coleenp@3602 1894 assert(current_chunk() == NULL ||
coleenp@3602 1895 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1896 "Don't need to expand");
coleenp@3602 1897 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1898
coleenp@3602 1899 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1900 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
coleenp@3602 1901 " words " SIZE_FORMAT " space left",
coleenp@3602 1902 word_size, current_chunk() != NULL ?
coleenp@3602 1903 current_chunk()->free_word_size() : 0);
coleenp@3602 1904 }
coleenp@3602 1905
coleenp@3602 1906 // Get another chunk out of the virtual space
coleenp@3602 1907 size_t grow_chunks_by_words = calc_chunk_size(word_size);
coleenp@3602 1908 Metachunk* next = vs_list()->get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 1909
coleenp@3602 1910 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 1911 // and do an allocation from it.
coleenp@3602 1912 if (next != NULL) {
coleenp@3602 1913 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 1914 // Add to this manager's list of chunks in use.
coleenp@3602 1915 add_chunk(next, false);
coleenp@3602 1916 return next->allocate(word_size);
coleenp@3602 1917 }
coleenp@3602 1918 return NULL;
coleenp@3602 1919 }
coleenp@3602 1920
coleenp@3602 1921 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 1922
coleenp@3602 1923 for (ChunkIndex i = SmallIndex;
jmasa@3761 1924 i < NumberOfInUseLists ;
coleenp@3602 1925 i = next_chunk_index(i) ) {
coleenp@3602 1926 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 1927 chunks_in_use(i),
coleenp@3602 1928 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 1929 }
coleenp@3602 1930 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 1931 " Humongous " SIZE_FORMAT,
coleenp@3602 1932 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 1933 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 1934 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 1935 // block free lists
jmasa@3761 1936 if (block_freelists() != NULL) {
jmasa@3761 1937 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 1938 block_freelists()->total_size());
jmasa@3761 1939 }
coleenp@3602 1940 }
coleenp@3602 1941
coleenp@3602 1942 SpaceManager::SpaceManager(Mutex* lock, VirtualSpaceList* vs_list) :
coleenp@3602 1943 _vs_list(vs_list),
coleenp@3602 1944 _allocation_total(0),
coleenp@3602 1945 _lock(lock) {
coleenp@3602 1946 Metadebug::init_allocation_fail_alot_count();
jmasa@3761 1947 for (ChunkIndex i = SmallIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1948 _chunks_in_use[i] = NULL;
coleenp@3602 1949 }
coleenp@3602 1950 _current_chunk = NULL;
coleenp@3602 1951 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1952 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1953 }
coleenp@3602 1954 }
coleenp@3602 1955
coleenp@3602 1956 SpaceManager::~SpaceManager() {
coleenp@3602 1957 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 1958 Mutex::_no_safepoint_check_flag);
coleenp@3602 1959
coleenp@3602 1960 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 1961
coleenp@3602 1962 chunk_manager->locked_verify();
coleenp@3602 1963
coleenp@3602 1964 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1965 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1966 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 1967 }
coleenp@3602 1968
coleenp@3602 1969 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 1970 // below.
coleenp@3602 1971 chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(),
coleenp@3602 1972 sum_count_in_chunks_in_use());
coleenp@3602 1973
coleenp@3602 1974 #ifdef ASSERT
coleenp@3602 1975 // Mangle freed memory.
coleenp@3602 1976 mangle_freed_chunks();
coleenp@3602 1977 #endif // ASSERT
coleenp@3602 1978
coleenp@3602 1979 // Add all the chunks in use by this space manager
coleenp@3602 1980 // to the global list of free chunks.
coleenp@3602 1981
coleenp@3602 1982 // Small chunks. There is one _current_chunk for each
coleenp@3602 1983 // Metaspace. It could point to a small or medium chunk.
coleenp@3602 1984 // Rather than determine which it is, follow the list of
coleenp@3602 1985 // small chunks to add them to the free list
coleenp@3602 1986 Metachunk* small_chunk = chunks_in_use(SmallIndex);
coleenp@3602 1987 chunk_manager->free_small_chunks()->add_at_head(small_chunk);
coleenp@3602 1988 set_chunks_in_use(SmallIndex, NULL);
coleenp@3602 1989
coleenp@3602 1990 // After the small chunk are the medium chunks
coleenp@3602 1991 Metachunk* medium_chunk = chunks_in_use(MediumIndex);
coleenp@3602 1992 assert(medium_chunk == NULL ||
coleenp@3602 1993 medium_chunk->word_size() == MediumChunk,
coleenp@3602 1994 "Chunk is on the wrong list");
coleenp@3602 1995
coleenp@3602 1996 if (medium_chunk != NULL) {
coleenp@3602 1997 Metachunk* head = medium_chunk;
coleenp@3602 1998 // If there is a medium chunk then the _current_chunk can only
coleenp@3602 1999 // point to the last medium chunk.
coleenp@3602 2000 Metachunk* tail = current_chunk();
coleenp@3602 2001 chunk_manager->free_medium_chunks()->add_at_head(head, tail);
coleenp@3602 2002 set_chunks_in_use(MediumIndex, NULL);
coleenp@3602 2003 }
coleenp@3602 2004
coleenp@3602 2005 // Humongous chunks
coleenp@3602 2006 // Humongous chunks are never the current chunk.
coleenp@3602 2007 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2008
jmasa@3761 2009 while (humongous_chunks != NULL) {
jmasa@3761 2010 #ifdef ASSERT
jmasa@3761 2011 humongous_chunks->set_is_free(true);
jmasa@3761 2012 #endif
jmasa@3761 2013 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@3761 2014 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2015 humongous_chunks = next_humongous_chunks;
coleenp@3602 2016 }
jmasa@3761 2017 set_chunks_in_use(HumongousIndex, NULL);
coleenp@3602 2018 chunk_manager->locked_verify();
coleenp@3602 2019 }
coleenp@3602 2020
jmasa@3761 2021 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2022 assert_lock_strong(_lock);
jmasa@3761 2023 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2024 assert(word_size >= min_size,
jmasa@3761 2025 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2026 block_freelists()->return_block(p, word_size);
coleenp@3602 2027 }
coleenp@3602 2028
coleenp@3602 2029 // Adds a chunk to the list of chunks in use.
coleenp@3602 2030 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2031
coleenp@3602 2032 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2033 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2034
coleenp@3602 2035 new_chunk->reset_empty();
coleenp@3602 2036
coleenp@3602 2037 // Find the correct list and and set the current
coleenp@3602 2038 // chunk for that list.
coleenp@3602 2039 switch (new_chunk->word_size()) {
coleenp@3602 2040 case SpaceManager::SmallChunk :
coleenp@3602 2041 if (chunks_in_use(SmallIndex) == NULL) {
coleenp@3602 2042 // First chunk to add to the list
coleenp@3602 2043 set_chunks_in_use(SmallIndex, new_chunk);
coleenp@3602 2044 } else {
coleenp@3602 2045 assert(current_chunk()->word_size() == SpaceManager::SmallChunk,
coleenp@3602 2046 err_msg( "Incorrect mix of sizes in chunk list "
coleenp@3602 2047 SIZE_FORMAT " new chunk " SIZE_FORMAT,
coleenp@3602 2048 current_chunk()->word_size(), new_chunk->word_size()));
coleenp@3602 2049 current_chunk()->set_next(new_chunk);
coleenp@3602 2050 }
coleenp@3602 2051 // Make current chunk
coleenp@3602 2052 set_current_chunk(new_chunk);
coleenp@3602 2053 break;
coleenp@3602 2054 case SpaceManager::MediumChunk :
coleenp@3602 2055 if (chunks_in_use(MediumIndex) == NULL) {
coleenp@3602 2056 // About to add the first medium chunk so teminate the
coleenp@3602 2057 // small chunk list. In general once medium chunks are
coleenp@3602 2058 // being added, we're past the need for small chunks.
coleenp@3602 2059 if (current_chunk() != NULL) {
coleenp@3602 2060 // Only a small chunk or the initial chunk could be
coleenp@3602 2061 // the current chunk if this is the first medium chunk.
coleenp@3602 2062 assert(current_chunk()->word_size() == SpaceManager::SmallChunk ||
coleenp@3602 2063 chunks_in_use(SmallIndex) == NULL,
coleenp@3602 2064 err_msg("Should be a small chunk or initial chunk, current chunk "
coleenp@3602 2065 SIZE_FORMAT " new chunk " SIZE_FORMAT,
coleenp@3602 2066 current_chunk()->word_size(), new_chunk->word_size()));
coleenp@3602 2067 current_chunk()->set_next(NULL);
coleenp@3602 2068 }
coleenp@3602 2069 // First chunk to add to the list
coleenp@3602 2070 set_chunks_in_use(MediumIndex, new_chunk);
coleenp@3602 2071
coleenp@3602 2072 } else {
coleenp@3602 2073 // As a minimum the first medium chunk added would
coleenp@3602 2074 // have become the _current_chunk
coleenp@3602 2075 // so the _current_chunk has to be non-NULL here
coleenp@3602 2076 // (although not necessarily still the first medium chunk).
coleenp@3602 2077 assert(current_chunk()->word_size() == SpaceManager::MediumChunk,
coleenp@3602 2078 "A medium chunk should the current chunk");
coleenp@3602 2079 current_chunk()->set_next(new_chunk);
coleenp@3602 2080 }
coleenp@3602 2081 // Make current chunk
coleenp@3602 2082 set_current_chunk(new_chunk);
coleenp@3602 2083 break;
coleenp@3602 2084 default: {
coleenp@3602 2085 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2086 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2087 // chunk.
coleenp@3602 2088 if (make_current) {
coleenp@3602 2089 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2090 set_current_chunk(new_chunk);
coleenp@3602 2091 }
coleenp@3602 2092 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2093 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2094 // any humongous chunks so will not point to the tail
coleenp@3602 2095 // of the humongous chunks list.
coleenp@3602 2096 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2097 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2098
coleenp@3602 2099 assert(new_chunk->word_size() > MediumChunk, "List inconsistency");
coleenp@3602 2100 }
coleenp@3602 2101 }
coleenp@3602 2102
coleenp@3602 2103 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2104 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2105 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2106 sum_count_in_chunks_in_use());
coleenp@3602 2107 new_chunk->print_on(gclog_or_tty);
coleenp@3602 2108 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
coleenp@3602 2109 }
coleenp@3602 2110 }
coleenp@3602 2111
coleenp@3602 2112 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2113 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2114
coleenp@3602 2115 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2116 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2117 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2118 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2119
jmasa@3761 2120 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2121
jmasa@3761 2122 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2123 Metablock::min_block_byte_size());
jmasa@3761 2124 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2125 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2126 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2127
coleenp@3602 2128 BlockFreelist* fl = block_freelists();
jmasa@3761 2129 MetaWord* p = NULL;
coleenp@3602 2130 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2131 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2132 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2133 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2134 // for allocations. Do some profiling. JJJ
jmasa@3761 2135 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2136 p = fl->get_block(raw_word_size);
coleenp@3602 2137 }
jmasa@3761 2138 if (p == NULL) {
jmasa@3761 2139 p = allocate_work(raw_word_size);
coleenp@3602 2140 }
coleenp@3602 2141 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2142
jmasa@3761 2143 return p;
coleenp@3602 2144 }
coleenp@3602 2145
coleenp@3602 2146 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2147 // This methods does not know about blocks (Metablocks)
jmasa@3761 2148 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2149 assert_lock_strong(_lock);
coleenp@3602 2150 #ifdef ASSERT
coleenp@3602 2151 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2152 return NULL;
coleenp@3602 2153 }
coleenp@3602 2154 #endif
coleenp@3602 2155 // Is there space in the current chunk?
jmasa@3761 2156 MetaWord* result = NULL;
coleenp@3602 2157
coleenp@3602 2158 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2159 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2160 // of memory if this returns null.
coleenp@3602 2161 if (DumpSharedSpaces) {
coleenp@3602 2162 assert(current_chunk() != NULL, "should never happen");
coleenp@3602 2163 inc_allocation_total(word_size);
coleenp@3602 2164 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2165 }
coleenp@3602 2166 if (current_chunk() != NULL) {
coleenp@3602 2167 result = current_chunk()->allocate(word_size);
coleenp@3602 2168 }
coleenp@3602 2169
coleenp@3602 2170 if (result == NULL) {
coleenp@3602 2171 result = grow_and_allocate(word_size);
coleenp@3602 2172 }
coleenp@3602 2173 if (result > 0) {
coleenp@3602 2174 inc_allocation_total(word_size);
jmasa@3761 2175 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2176 "Head of the list is being allocated");
coleenp@3602 2177 }
coleenp@3602 2178
coleenp@3602 2179 return result;
coleenp@3602 2180 }
coleenp@3602 2181
coleenp@3602 2182 void SpaceManager::verify() {
coleenp@3602 2183 // If there are blocks in the dictionary, then
coleenp@3602 2184 // verfication of chunks does not work since
coleenp@3602 2185 // being in the dictionary alters a chunk.
jmasa@3761 2186 if (block_freelists()->total_size() == 0) {
coleenp@3602 2187 // Skip the small chunks because their next link points to
coleenp@3602 2188 // medium chunks. This is because the small chunk is the
coleenp@3602 2189 // current chunk (for allocations) until it is full and the
coleenp@3602 2190 // the addition of the next chunk does not NULL the next
coleenp@3602 2191 // like of the small chunk.
jmasa@3761 2192 for (ChunkIndex i = MediumIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2193 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2194 while (curr != NULL) {
coleenp@3602 2195 curr->verify();
coleenp@3602 2196 curr = curr->next();
coleenp@3602 2197 }
coleenp@3602 2198 }
coleenp@3602 2199 }
coleenp@3602 2200 }
coleenp@3602 2201
coleenp@3602 2202 #ifdef ASSERT
coleenp@3602 2203 void SpaceManager::verify_allocation_total() {
coleenp@3602 2204 #if 0
coleenp@3602 2205 // Verification is only guaranteed at a safepoint.
coleenp@3602 2206 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2207 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT
coleenp@3602 2208 " sum_used_in_chunks_in_use " SIZE_FORMAT,
coleenp@3602 2209 this,
coleenp@3602 2210 allocation_total(),
coleenp@3602 2211 sum_used_in_chunks_in_use());
coleenp@3602 2212 }
coleenp@3602 2213 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2214 assert(allocation_total() == sum_used_in_chunks_in_use(),
coleenp@3602 2215 err_msg("allocation total is not consistent %d vs %d",
coleenp@3602 2216 allocation_total(), sum_used_in_chunks_in_use()));
coleenp@3602 2217 #endif
coleenp@3602 2218 }
coleenp@3602 2219
coleenp@3602 2220 #endif
coleenp@3602 2221
coleenp@3602 2222 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2223 size_t curr_total = 0;
coleenp@3602 2224 size_t waste = 0;
coleenp@3602 2225 uint i = 0;
coleenp@3602 2226 size_t used = 0;
coleenp@3602 2227 size_t capacity = 0;
coleenp@3602 2228
coleenp@3602 2229 // Add up statistics for all chunks in this SpaceManager.
coleenp@3602 2230 for (ChunkIndex index = SmallIndex;
jmasa@3761 2231 index < NumberOfInUseLists;
coleenp@3602 2232 index = next_chunk_index(index)) {
coleenp@3602 2233 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2234 curr != NULL;
coleenp@3602 2235 curr = curr->next()) {
coleenp@3602 2236 out->print("%d) ", i++);
coleenp@3602 2237 curr->print_on(out);
coleenp@3602 2238 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2239 block_freelists()->print_on(out);
coleenp@3602 2240 }
coleenp@3602 2241 curr_total += curr->word_size();
coleenp@3602 2242 used += curr->used_word_size();
coleenp@3602 2243 capacity += curr->capacity_word_size();
coleenp@3602 2244 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2245 }
coleenp@3602 2246 }
coleenp@3602 2247
coleenp@3602 2248 size_t free = current_chunk()->free_word_size();
coleenp@3602 2249 // Free space isn't wasted.
coleenp@3602 2250 waste -= free;
coleenp@3602 2251
coleenp@3602 2252 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2253 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2254 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2255 }
coleenp@3602 2256
jmasa@3662 2257 #ifdef ASSERT
coleenp@3602 2258 void SpaceManager::mangle_freed_chunks() {
coleenp@3602 2259 for (ChunkIndex index = SmallIndex;
jmasa@3761 2260 index < NumberOfInUseLists;
coleenp@3602 2261 index = next_chunk_index(index)) {
coleenp@3602 2262 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2263 curr != NULL;
coleenp@3602 2264 curr = curr->next()) {
coleenp@3602 2265 // Try to detect incorrectly terminated small chunk
coleenp@3602 2266 // list.
coleenp@3602 2267 assert(index == MediumIndex || curr != chunks_in_use(MediumIndex),
coleenp@3602 2268 err_msg("Mangling medium chunks in small chunks? "
coleenp@3602 2269 "curr " PTR_FORMAT " medium list " PTR_FORMAT,
coleenp@3602 2270 curr, chunks_in_use(MediumIndex)));
coleenp@3602 2271 curr->mangle();
coleenp@3602 2272 }
coleenp@3602 2273 }
coleenp@3602 2274 }
jmasa@3662 2275 #endif // ASSERT
coleenp@3602 2276
coleenp@3602 2277
coleenp@3602 2278 // MetaspaceAux
coleenp@3602 2279
jmasa@3611 2280 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) {
jmasa@3607 2281 size_t used = 0;
jmasa@3607 2282 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2283 while (iter.repeat()) {
jmasa@3607 2284 Metaspace* msp = iter.get_next();
jmasa@3607 2285 // Sum allocation_total for each metaspace
jmasa@3607 2286 if (msp != NULL) {
jmasa@3607 2287 used += msp->used_words(mdtype);
jmasa@3607 2288 }
jmasa@3607 2289 }
jmasa@3607 2290 return used * BytesPerWord;
jmasa@3607 2291 }
jmasa@3607 2292
coleenp@3602 2293 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2294 size_t free = 0;
coleenp@3602 2295 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2296 while (iter.repeat()) {
coleenp@3602 2297 Metaspace* msp = iter.get_next();
coleenp@3602 2298 if (msp != NULL) {
coleenp@3602 2299 free += msp->free_words(mdtype);
coleenp@3602 2300 }
coleenp@3602 2301 }
coleenp@3602 2302 return free * BytesPerWord;
coleenp@3602 2303 }
coleenp@3602 2304
coleenp@3602 2305 // The total words available for metadata allocation. This
coleenp@3602 2306 // uses Metaspace capacity_words() which is the total words
coleenp@3602 2307 // in chunks allocated for a Metaspace.
coleenp@3602 2308 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2309 size_t capacity = free_chunks_total(mdtype);
coleenp@3602 2310 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2311 while (iter.repeat()) {
coleenp@3602 2312 Metaspace* msp = iter.get_next();
coleenp@3602 2313 if (msp != NULL) {
coleenp@3602 2314 capacity += msp->capacity_words(mdtype);
coleenp@3602 2315 }
coleenp@3602 2316 }
coleenp@3602 2317 return capacity * BytesPerWord;
coleenp@3602 2318 }
coleenp@3602 2319
coleenp@3602 2320 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2321 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2322 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2323 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2324 return reserved * BytesPerWord;
coleenp@3602 2325 }
coleenp@3602 2326
coleenp@3602 2327 size_t MetaspaceAux::min_chunk_size() { return SpaceManager::MediumChunk; }
coleenp@3602 2328
coleenp@3602 2329 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2330 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2331 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2332 Metaspace::space_list()->chunk_manager();
coleenp@3602 2333
coleenp@3602 2334 chunk->verify_free_chunks_total();
coleenp@3602 2335 return chunk->free_chunks_total();
coleenp@3602 2336 }
coleenp@3602 2337
coleenp@3602 2338 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2339 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2340 }
coleenp@3602 2341
coleenp@3602 2342 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2343 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2344 if (PrintGCDetails && Verbose) {
coleenp@3602 2345 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2346 "->" SIZE_FORMAT
coleenp@3602 2347 "(" SIZE_FORMAT "/" SIZE_FORMAT ")",
coleenp@3602 2348 prev_metadata_used,
coleenp@3602 2349 used_in_bytes(),
coleenp@3602 2350 capacity_in_bytes(),
coleenp@3602 2351 reserved_in_bytes());
coleenp@3602 2352 } else {
coleenp@3602 2353 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2354 "->" SIZE_FORMAT "K"
coleenp@3602 2355 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)",
coleenp@3602 2356 prev_metadata_used / K,
coleenp@3602 2357 used_in_bytes()/ K,
coleenp@3602 2358 capacity_in_bytes()/K,
coleenp@3602 2359 reserved_in_bytes()/ K);
coleenp@3602 2360 }
coleenp@3602 2361
coleenp@3602 2362 gclog_or_tty->print("]");
coleenp@3602 2363 }
coleenp@3602 2364
coleenp@3602 2365 // This is printed when PrintGCDetails
coleenp@3602 2366 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2367 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2368 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2369
coleenp@3602 2370 out->print_cr(" Metaspace total "
coleenp@3602 2371 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2372 " reserved " SIZE_FORMAT "K",
jmasa@3611 2373 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K);
coleenp@3602 2374 out->print_cr(" data space "
coleenp@3602 2375 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2376 " reserved " SIZE_FORMAT "K",
jmasa@3611 2377 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K);
coleenp@3602 2378 out->print_cr(" class space "
coleenp@3602 2379 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2380 " reserved " SIZE_FORMAT "K",
jmasa@3611 2381 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K);
coleenp@3602 2382 }
coleenp@3602 2383
coleenp@3602 2384 // Print information for class space and data space separately.
coleenp@3602 2385 // This is almost the same as above.
coleenp@3602 2386 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2387 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
coleenp@3602 2388 size_t capacity_bytes = capacity_in_bytes(mdtype);
coleenp@3602 2389 size_t used_bytes = used_in_bytes(mdtype);
coleenp@3602 2390 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2391 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2392 free_chunks_capacity_bytes;
coleenp@3602 2393 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2394 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2395 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2396 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2397 used_bytes / K,
coleenp@3602 2398 free_bytes / K,
coleenp@3602 2399 free_chunks_capacity_bytes / K,
coleenp@3602 2400 used_and_free / K,
coleenp@3602 2401 capacity_bytes / K);
coleenp@3602 2402 assert(used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2403 }
coleenp@3602 2404
coleenp@3602 2405 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2406 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2407
coleenp@3602 2408 size_t small_waste = 0, medium_waste = 0, large_waste = 0;
coleenp@3602 2409 size_t cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
coleenp@3602 2410
coleenp@3602 2411 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2412 while (iter.repeat()) {
coleenp@3602 2413 Metaspace* msp = iter.get_next();
coleenp@3602 2414 if (msp != NULL) {
coleenp@3602 2415 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
coleenp@3602 2416 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
coleenp@3602 2417 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
coleenp@3602 2418
coleenp@3602 2419 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
coleenp@3602 2420 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
coleenp@3602 2421 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
coleenp@3602 2422 }
coleenp@3602 2423 }
coleenp@3602 2424 out->print_cr("Total fragmentation waste (words) doesn't count free space");
coleenp@3602 2425 out->print(" data: small " SIZE_FORMAT " medium " SIZE_FORMAT,
coleenp@3602 2426 small_waste, medium_waste);
coleenp@3602 2427 out->print_cr(" class: small " SIZE_FORMAT, cls_small_waste);
coleenp@3602 2428 }
coleenp@3602 2429
coleenp@3602 2430 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2431 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2432 out->print_cr("All Metaspace:");
coleenp@3602 2433 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2434 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2435 print_waste(out);
coleenp@3602 2436 }
coleenp@3602 2437
coleenp@3602 2438 // Metaspace methods
coleenp@3602 2439
coleenp@3602 2440 size_t Metaspace::_first_chunk_word_size = 0;
coleenp@3602 2441
coleenp@3602 2442 Metaspace::Metaspace(Mutex* lock, size_t word_size) {
coleenp@3602 2443 initialize(lock, word_size);
coleenp@3602 2444 }
coleenp@3602 2445
coleenp@3602 2446 Metaspace::Metaspace(Mutex* lock) {
coleenp@3602 2447 initialize(lock);
coleenp@3602 2448 }
coleenp@3602 2449
coleenp@3602 2450 Metaspace::~Metaspace() {
coleenp@3602 2451 delete _vsm;
coleenp@3602 2452 delete _class_vsm;
coleenp@3602 2453 }
coleenp@3602 2454
coleenp@3602 2455 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2456 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2457
coleenp@3602 2458 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2459
coleenp@3602 2460 void Metaspace::global_initialize() {
coleenp@3602 2461 // Initialize the alignment for shared spaces.
coleenp@3602 2462 int max_alignment = os::vm_page_size();
coleenp@3602 2463 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2464
coleenp@3602 2465 if (DumpSharedSpaces) {
coleenp@3602 2466 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2467 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2468 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2469 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2470
coleenp@3602 2471 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2472 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2473 // remainder is the misc code and data chunks.
coleenp@3602 2474 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2475 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2476 os::vm_allocation_granularity());
coleenp@3602 2477 size_t word_size = total/wordSize;
coleenp@3602 2478 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2479 } else {
coleenp@3602 2480 // If using shared space, open the file that contains the shared space
coleenp@3602 2481 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2482 // the addresses don't conflict)
coleenp@3602 2483 if (UseSharedSpaces) {
coleenp@3602 2484 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2485 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2486
coleenp@3602 2487 // Open the shared archive file, read and validate the header. If
coleenp@3602 2488 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2489 // disabled and the file is closed.
coleenp@3602 2490 // Map in spaces now also
coleenp@3602 2491 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2492 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2493 } else {
coleenp@3602 2494 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2495 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2496 }
coleenp@3602 2497 }
coleenp@3602 2498
coleenp@3602 2499 // Initialize this before initializing the VirtualSpaceList
coleenp@3602 2500 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
coleenp@3602 2501 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2502 // of the boot class loader size.
coleenp@3602 2503 size_t word_size = VIRTUALSPACEMULTIPLIER * Metaspace::first_chunk_word_size();
coleenp@3602 2504 // Initialize the list of virtual spaces.
coleenp@3602 2505 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2506 }
coleenp@3602 2507 }
coleenp@3602 2508
coleenp@3602 2509 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2510 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2511 // argument passed in is at the top of the compressed space
coleenp@3602 2512 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2513 // The reserved space size may be bigger because of alignment, esp with UseLargePages
coleenp@3602 2514 assert(rs.size() >= ClassMetaspaceSize, err_msg("%d != %d", rs.size(), ClassMetaspaceSize));
coleenp@3602 2515 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2516 }
coleenp@3602 2517
coleenp@3602 2518
coleenp@3602 2519 void Metaspace::initialize(Mutex* lock, size_t initial_size) {
coleenp@3613 2520 // Use SmallChunk size if not specified. If specified, use this size for
coleenp@3613 2521 // the data metaspace.
coleenp@3602 2522 size_t word_size;
coleenp@3602 2523 size_t class_word_size;
coleenp@3602 2524 if (initial_size == 0) {
coleenp@3602 2525 word_size = (size_t) SpaceManager::SmallChunk;
coleenp@3613 2526 class_word_size = (size_t) SpaceManager::SmallChunk;
coleenp@3602 2527 } else {
coleenp@3602 2528 word_size = initial_size;
coleenp@3613 2529 // Make the first class chunk bigger than a medium chunk so it's not put
coleenp@3613 2530 // on the medium chunk list. The next chunk will be small and progress
coleenp@3613 2531 // from there. This size calculated by -version.
coleenp@3613 2532 class_word_size = MIN2((size_t)SpaceManager::MediumChunk*5,
coleenp@3613 2533 (ClassMetaspaceSize/BytesPerWord)*2);
coleenp@3602 2534 }
coleenp@3602 2535
coleenp@3602 2536 assert(space_list() != NULL,
coleenp@3602 2537 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2538
coleenp@3602 2539 _vsm = new SpaceManager(lock, space_list());
coleenp@3602 2540 if (_vsm == NULL) {
coleenp@3602 2541 return;
coleenp@3602 2542 }
coleenp@3602 2543
coleenp@3602 2544 assert(class_space_list() != NULL,
coleenp@3602 2545 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2546
coleenp@3602 2547 // Allocate SpaceManager for classes.
coleenp@3602 2548 _class_vsm = new SpaceManager(lock, class_space_list());
coleenp@3602 2549 if (_class_vsm == NULL) {
coleenp@3602 2550 return;
coleenp@3602 2551 }
coleenp@3602 2552
coleenp@3602 2553 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2554
coleenp@3602 2555 // Allocate chunk for metadata objects
coleenp@3602 2556 Metachunk* new_chunk =
coleenp@3602 2557 space_list()->current_virtual_space()->get_chunk_vs_with_expand(word_size);
coleenp@3602 2558 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2559 if (new_chunk != NULL) {
coleenp@3602 2560 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2561 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2562 }
coleenp@3602 2563
coleenp@3602 2564 // Allocate chunk for class metadata objects
coleenp@3602 2565 Metachunk* class_chunk =
coleenp@3602 2566 class_space_list()->current_virtual_space()->get_chunk_vs_with_expand(class_word_size);
coleenp@3602 2567 if (class_chunk != NULL) {
coleenp@3602 2568 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2569 }
coleenp@3602 2570 }
coleenp@3602 2571
coleenp@3602 2572 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2573 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2574 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2575 return class_vsm()->allocate(word_size);
coleenp@3602 2576 } else {
jmasa@3761 2577 return vsm()->allocate(word_size);
coleenp@3602 2578 }
coleenp@3602 2579 }
coleenp@3602 2580
jmasa@3629 2581 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2582 MetaWord* result;
jmasa@3629 2583 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2584 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@3629 2585 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size);
jmasa@3629 2586 MetaspaceGC::inc_capacity_until_GC(delta_words);
jmasa@3629 2587 if (PrintGCDetails && Verbose) {
jmasa@3629 2588 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2589 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2590 }
jmasa@3761 2591
jmasa@3629 2592 result = allocate(word_size, mdtype);
jmasa@3629 2593
jmasa@3629 2594 return result;
jmasa@3629 2595 }
jmasa@3629 2596
coleenp@3602 2597 // Space allocated in the Metaspace. This may
coleenp@3602 2598 // be across several metadata virtual spaces.
coleenp@3602 2599 char* Metaspace::bottom() const {
coleenp@3602 2600 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2601 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2602 }
coleenp@3602 2603
coleenp@3602 2604 size_t Metaspace::used_words(MetadataType mdtype) const {
coleenp@3602 2605 // return vsm()->allocation_total();
coleenp@3602 2606 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2607 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2608 }
coleenp@3602 2609
coleenp@3602 2610 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2611 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2612 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2613 }
coleenp@3602 2614
coleenp@3602 2615 // Space capacity in the Metaspace. It includes
coleenp@3602 2616 // space in the list of chunks from which allocations
coleenp@3602 2617 // have been made. Don't include space in the global freelist and
coleenp@3602 2618 // in the space available in the dictionary which
coleenp@3602 2619 // is already counted in some chunk.
coleenp@3602 2620 size_t Metaspace::capacity_words(MetadataType mdtype) const {
coleenp@3602 2621 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2622 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2623 }
coleenp@3602 2624
coleenp@3602 2625 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2626 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2627 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2628 // Don't take Heap_lock
jmasa@3761 2629 MutexLocker ml(vsm()->lock());
jmasa@3761 2630 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2631 // Dark matter. Too small for dictionary.
jmasa@3761 2632 #ifdef ASSERT
jmasa@3761 2633 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2634 #endif
jmasa@3761 2635 return;
jmasa@3761 2636 }
coleenp@3602 2637 if (is_class) {
jmasa@3761 2638 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2639 } else {
jmasa@3761 2640 vsm()->deallocate(ptr, word_size);
coleenp@3602 2641 }
coleenp@3602 2642 } else {
coleenp@3602 2643 MutexLocker ml(vsm()->lock());
coleenp@3602 2644
jmasa@3761 2645 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2646 // Dark matter. Too small for dictionary.
jmasa@3761 2647 #ifdef ASSERT
jmasa@3761 2648 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2649 #endif
jmasa@3761 2650 return;
jmasa@3761 2651 }
coleenp@3602 2652 if (is_class) {
jmasa@3761 2653 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2654 } else {
jmasa@3761 2655 vsm()->deallocate(ptr, word_size);
coleenp@3602 2656 }
coleenp@3602 2657 }
coleenp@3602 2658 }
coleenp@3602 2659
jmasa@3761 2660 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 2661 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 2662 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 2663 assert(false, "Should not allocate with exception pending");
coleenp@3602 2664 return NULL; // caller does a CHECK_NULL too
coleenp@3602 2665 }
coleenp@3602 2666
coleenp@3602 2667 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 2668 MetaWord* result = NULL;
coleenp@3602 2669
coleenp@3602 2670 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 2671 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 2672 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 2673 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 2674 // to revisit this for application class data sharing.
coleenp@3602 2675 if (DumpSharedSpaces) {
coleenp@3602 2676 if (read_only) {
coleenp@3602 2677 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2678 } else {
coleenp@3602 2679 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2680 }
coleenp@3602 2681 if (result == NULL) {
coleenp@3602 2682 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 2683 }
jmasa@3761 2684 return Metablock::initialize(result, word_size);
coleenp@3602 2685 }
coleenp@3602 2686
coleenp@3602 2687 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 2688
coleenp@3602 2689 if (result == NULL) {
coleenp@3602 2690 // Try to clean out some memory and retry.
coleenp@3602 2691 result =
jmasa@3761 2692 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 2693 loader_data, word_size, mdtype);
coleenp@3602 2694
coleenp@3602 2695 // If result is still null, we are out of memory.
coleenp@3602 2696 if (result == NULL) {
coleenp@3602 2697 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 2698 report_java_out_of_memory("Metadata space");
coleenp@3602 2699
coleenp@3602 2700 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 2701 JvmtiExport::post_resource_exhausted(
coleenp@3602 2702 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 2703 "Metadata space");
coleenp@3602 2704 }
coleenp@3602 2705 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 2706 }
coleenp@3602 2707 }
jmasa@3761 2708 return Metablock::initialize(result, word_size);
coleenp@3602 2709 }
coleenp@3602 2710
coleenp@3602 2711 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 2712 // Print both class virtual space counts and metaspace.
coleenp@3602 2713 if (Verbose) {
coleenp@3602 2714 vsm()->print_on(out);
coleenp@3602 2715 class_vsm()->print_on(out);
coleenp@3602 2716 }
coleenp@3602 2717 }
coleenp@3602 2718
coleenp@3602 2719 #ifndef PRODUCT
coleenp@3602 2720 bool Metaspace::contains(const void * ptr) const {
coleenp@3602 2721 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 2722 return true;
coleenp@3602 2723 }
coleenp@3602 2724 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2725 return space_list()->contains(ptr) || class_space_list()->contains(ptr);
coleenp@3602 2726 }
coleenp@3602 2727 #endif
coleenp@3602 2728
coleenp@3602 2729 void Metaspace::verify() {
coleenp@3602 2730 vsm()->verify();
coleenp@3602 2731 class_vsm()->verify();
coleenp@3602 2732 }
coleenp@3602 2733
coleenp@3602 2734 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 2735 if (UseMallocOnly) {
coleenp@3602 2736 // Just print usage for now
coleenp@3602 2737 out->print_cr("usage %d", used_words(Metaspace::NonClassType));
coleenp@3602 2738 }
coleenp@3602 2739 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 2740 vsm()->dump(out);
coleenp@3602 2741 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 2742 class_vsm()->dump(out);
coleenp@3602 2743 }