annotate src/share/vm/memory/metaspace.cpp @ 4727:2b1a9d972fc2

8014862: Add fast Metasapce capacity and used per MetadataType Reviewed-by: ehelin, stefank
author jmasa
date Mon, 20 May 2013 22:34:24 -0700
parents 601183f604b2
children a1ebd310d5c1
rev   line source
coleenp@3602 1 /*
coleenp@4277 2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
coleenp@3602 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@3602 4 *
coleenp@3602 5 * This code is free software; you can redistribute it and/or modify it
coleenp@3602 6 * under the terms of the GNU General Public License version 2 only, as
coleenp@3602 7 * published by the Free Software Foundation.
coleenp@3602 8 *
coleenp@3602 9 * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@3602 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@3602 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
coleenp@3602 12 * version 2 for more details (a copy is included in the LICENSE file that
coleenp@3602 13 * accompanied this code).
coleenp@3602 14 *
coleenp@3602 15 * You should have received a copy of the GNU General Public License version
coleenp@3602 16 * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@3602 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@3602 18 *
coleenp@3602 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@3602 20 * or visit www.oracle.com if you need additional information or have any
coleenp@3602 21 * questions.
coleenp@3602 22 *
coleenp@3602 23 */
coleenp@3602 24 #include "precompiled.hpp"
coleenp@3602 25 #include "gc_interface/collectedHeap.hpp"
coleenp@3602 26 #include "memory/binaryTreeDictionary.hpp"
jmasa@3761 27 #include "memory/freeList.hpp"
coleenp@3602 28 #include "memory/collectorPolicy.hpp"
coleenp@3602 29 #include "memory/filemap.hpp"
coleenp@3602 30 #include "memory/freeList.hpp"
jmasa@3761 31 #include "memory/metablock.hpp"
jmasa@3761 32 #include "memory/metachunk.hpp"
coleenp@3602 33 #include "memory/metaspace.hpp"
coleenp@3602 34 #include "memory/metaspaceShared.hpp"
coleenp@3602 35 #include "memory/resourceArea.hpp"
coleenp@3602 36 #include "memory/universe.hpp"
coleenp@3602 37 #include "runtime/globals.hpp"
coleenp@3602 38 #include "runtime/mutex.hpp"
coleenp@3860 39 #include "runtime/orderAccess.hpp"
coleenp@3602 40 #include "services/memTracker.hpp"
coleenp@3602 41 #include "utilities/copy.hpp"
coleenp@3602 42 #include "utilities/debug.hpp"
coleenp@3602 43
jmasa@3761 44 typedef BinaryTreeDictionary<Metablock, FreeList> BlockTreeDictionary;
jmasa@3761 45 typedef BinaryTreeDictionary<Metachunk, FreeList> ChunkTreeDictionary;
mgerdin@3829 46 // Define this macro to enable slow integrity checking of
mgerdin@3829 47 // the free chunk lists
mgerdin@3829 48 const bool metaspace_slow_verify = false;
mgerdin@3829 49
coleenp@3602 50 // Parameters for stress mode testing
coleenp@3602 51 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 52 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 53 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 54
coleenp@3602 55 MetaWord* last_allocated = 0;
coleenp@3602 56
coleenp@3602 57 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 58 enum ChunkIndex {
jmasa@3947 59 ZeroIndex = 0,
jmasa@3947 60 SpecializedIndex = ZeroIndex,
jmasa@3947 61 SmallIndex = SpecializedIndex + 1,
jmasa@3947 62 MediumIndex = SmallIndex + 1,
jmasa@3947 63 HumongousIndex = MediumIndex + 1,
jmasa@3947 64 NumberOfFreeLists = 3,
jmasa@3947 65 NumberOfInUseLists = 4
jmasa@3947 66 };
jmasa@3947 67
jmasa@3947 68 enum ChunkSizes { // in words.
jmasa@3947 69 ClassSpecializedChunk = 128,
jmasa@3947 70 SpecializedChunk = 128,
jmasa@3947 71 ClassSmallChunk = 256,
jmasa@3947 72 SmallChunk = 512,
jmasa@3947 73 ClassMediumChunk = 1 * K,
jmasa@3947 74 MediumChunk = 8 * K,
jmasa@3947 75 HumongousChunkGranularity = 8
coleenp@3602 76 };
coleenp@3602 77
coleenp@3602 78 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 79 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 80 return (ChunkIndex) (i+1);
coleenp@3602 81 }
coleenp@3602 82
coleenp@3602 83 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 84 // the default MetaspaceSize before argument processing was being
coleenp@3602 85 // used which was not the desired value. See the code
coleenp@3602 86 // in should_expand() to see how the initialization is handled
coleenp@3602 87 // now.
coleenp@3602 88 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 89 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 90 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 91 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 92
coleenp@3602 93 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 94 //
coleenp@3602 95 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 96 // allocated there is no explicit link between a Metachunk and
coleenp@3602 97 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 98 //
coleenp@3602 99 // Each SpaceManager maintains a
coleenp@3602 100 // list of the chunks it is using and the current chunk. The current
coleenp@3602 101 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 102 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 103 // reused from there.
coleenp@3602 104
jmasa@4497 105 typedef class FreeList<Metachunk> ChunkList;
coleenp@3602 106
coleenp@3602 107 // Manages the global free lists of chunks.
coleenp@3602 108 // Has three lists of free chunks, and a total size and
coleenp@3602 109 // count that includes all three
coleenp@3602 110
coleenp@3602 111 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 112
coleenp@3602 113 // Free list of chunks of different sizes.
jmasa@4572 114 // SpecializedChunk
coleenp@3602 115 // SmallChunk
coleenp@3602 116 // MediumChunk
coleenp@3602 117 // HumongousChunk
jmasa@3761 118 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 119
jmasa@3947 120
jmasa@3761 121 // HumongousChunk
jmasa@3761 122 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 123
coleenp@3602 124 // ChunkManager in all lists of this type
coleenp@3602 125 size_t _free_chunks_total;
coleenp@3602 126 size_t _free_chunks_count;
coleenp@3602 127
coleenp@3602 128 void dec_free_chunks_total(size_t v) {
coleenp@3602 129 assert(_free_chunks_count > 0 &&
coleenp@3602 130 _free_chunks_total > 0,
coleenp@3602 131 "About to go negative");
coleenp@3602 132 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 133 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 134 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 135 }
coleenp@3602 136
coleenp@3602 137 // Debug support
coleenp@3602 138
coleenp@3602 139 size_t sum_free_chunks();
coleenp@3602 140 size_t sum_free_chunks_count();
coleenp@3602 141
coleenp@3602 142 void locked_verify_free_chunks_total();
mgerdin@3829 143 void slow_locked_verify_free_chunks_total() {
mgerdin@3829 144 if (metaspace_slow_verify) {
mgerdin@3829 145 locked_verify_free_chunks_total();
mgerdin@3829 146 }
mgerdin@3829 147 }
coleenp@3602 148 void locked_verify_free_chunks_count();
mgerdin@3829 149 void slow_locked_verify_free_chunks_count() {
mgerdin@3829 150 if (metaspace_slow_verify) {
mgerdin@3829 151 locked_verify_free_chunks_count();
mgerdin@3829 152 }
mgerdin@3829 153 }
coleenp@3602 154 void verify_free_chunks_count();
coleenp@3602 155
coleenp@3602 156 public:
coleenp@3602 157
coleenp@3602 158 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 159
coleenp@3602 160 // add or delete (return) a chunk to the global freelist.
coleenp@3602 161 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 162 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 163
jmasa@3947 164 // Map a size to a list index assuming that there are lists
jmasa@3947 165 // for special, small, medium, and humongous chunks.
jmasa@3947 166 static ChunkIndex list_index(size_t size);
jmasa@3947 167
jmasa@4572 168 // Remove the chunk from its freelist. It is
jmasa@4572 169 // expected to be on one of the _free_chunks[] lists.
jmasa@4572 170 void remove_chunk(Metachunk* chunk);
jmasa@4572 171
jmasa@4497 172 // Add the simple linked list of chunks to the freelist of chunks
jmasa@4497 173 // of type index.
jmasa@4497 174 void return_chunks(ChunkIndex index, Metachunk* chunks);
jmasa@4497 175
coleenp@3602 176 // Total of the space in the free chunks list
coleenp@3602 177 size_t free_chunks_total();
coleenp@3602 178 size_t free_chunks_total_in_bytes();
coleenp@3602 179
coleenp@3602 180 // Number of chunks in the free chunks list
coleenp@3602 181 size_t free_chunks_count();
coleenp@3602 182
coleenp@3602 183 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 184 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 185 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 186 }
jmasa@3761 187 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 188 return &_humongous_dictionary;
jmasa@3761 189 }
coleenp@3602 190
coleenp@3602 191 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 192
coleenp@3602 193 // Returns the list for the given chunk word size.
coleenp@3602 194 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 195
coleenp@3602 196 // Add and remove from a list by size. Selects
coleenp@3602 197 // list based on size of chunk.
coleenp@3602 198 void free_chunks_put(Metachunk* chuck);
coleenp@3602 199 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 200
coleenp@3602 201 // Debug support
coleenp@3602 202 void verify();
mgerdin@3829 203 void slow_verify() {
mgerdin@3829 204 if (metaspace_slow_verify) {
mgerdin@3829 205 verify();
mgerdin@3829 206 }
mgerdin@3829 207 }
coleenp@3602 208 void locked_verify();
mgerdin@3829 209 void slow_locked_verify() {
mgerdin@3829 210 if (metaspace_slow_verify) {
mgerdin@3829 211 locked_verify();
mgerdin@3829 212 }
mgerdin@3829 213 }
coleenp@3602 214 void verify_free_chunks_total();
coleenp@3602 215
coleenp@3602 216 void locked_print_free_chunks(outputStream* st);
coleenp@3602 217 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 218
jmasa@3761 219 void print_on(outputStream* st);
coleenp@3602 220 };
coleenp@3602 221
coleenp@3602 222 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 223 // to the allocation of a quantum of metadata).
coleenp@3602 224 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 225 BlockTreeDictionary* _dictionary;
jmasa@3761 226 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 227
coleenp@3602 228 // Accessors
jmasa@3761 229 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 230
coleenp@3602 231 public:
coleenp@3602 232 BlockFreelist();
coleenp@3602 233 ~BlockFreelist();
coleenp@3602 234
coleenp@3602 235 // Get and return a block to the free list
jmasa@3761 236 MetaWord* get_block(size_t word_size);
jmasa@3761 237 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 238
jmasa@3761 239 size_t total_size() {
jmasa@3761 240 if (dictionary() == NULL) {
coleenp@3602 241 return 0;
jmasa@3761 242 } else {
jmasa@3761 243 return dictionary()->total_size();
coleenp@3602 244 }
jmasa@3761 245 }
coleenp@3602 246
coleenp@3602 247 void print_on(outputStream* st) const;
coleenp@3602 248 };
coleenp@3602 249
coleenp@3602 250 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 251 friend class VirtualSpaceList;
coleenp@3602 252
coleenp@3602 253 // Link to next VirtualSpaceNode
coleenp@3602 254 VirtualSpaceNode* _next;
coleenp@3602 255
coleenp@3602 256 // total in the VirtualSpace
coleenp@3602 257 MemRegion _reserved;
coleenp@3602 258 ReservedSpace _rs;
coleenp@3602 259 VirtualSpace _virtual_space;
coleenp@3602 260 MetaWord* _top;
jmasa@4572 261 // count of chunks contained in this VirtualSpace
jmasa@4572 262 uintx _container_count;
coleenp@3602 263
coleenp@3602 264 // Convenience functions for logical bottom and end
coleenp@3602 265 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 266 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 267
coleenp@3602 268 // Convenience functions to access the _virtual_space
coleenp@3602 269 char* low() const { return virtual_space()->low(); }
coleenp@3602 270 char* high() const { return virtual_space()->high(); }
coleenp@3602 271
jmasa@4572 272 // The first Metachunk will be allocated at the bottom of the
jmasa@4572 273 // VirtualSpace
jmasa@4572 274 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
jmasa@4572 275
jmasa@4572 276 void inc_container_count();
jmasa@4572 277 #ifdef ASSERT
jmasa@4572 278 uint container_count_slow();
jmasa@4572 279 #endif
jmasa@4572 280
coleenp@3602 281 public:
coleenp@3602 282
coleenp@3602 283 VirtualSpaceNode(size_t byte_size);
jmasa@4572 284 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
coleenp@3602 285 ~VirtualSpaceNode();
coleenp@3602 286
coleenp@3602 287 // address of next available space in _virtual_space;
coleenp@3602 288 // Accessors
coleenp@3602 289 VirtualSpaceNode* next() { return _next; }
coleenp@3602 290 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 291
coleenp@3602 292 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 293 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 294
coleenp@3602 295 // Accessors
coleenp@3602 296 MemRegion* reserved() { return &_reserved; }
coleenp@3602 297 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 298
jmasa@4580 299 // Returns true if "word_size" is available in the VirtualSpace
coleenp@3602 300 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 301
coleenp@3602 302 MetaWord* top() const { return _top; }
coleenp@3602 303 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 304
jmasa@4572 305 uintx container_count() { return _container_count; }
jmasa@4572 306 void dec_container_count();
jmasa@4572 307 #ifdef ASSERT
jmasa@4572 308 void verify_container_count();
jmasa@4572 309 #endif
jmasa@4572 310
coleenp@3602 311 // used and capacity in this single entry in the list
coleenp@3602 312 size_t used_words_in_vs() const;
coleenp@3602 313 size_t capacity_words_in_vs() const;
jmasa@4580 314 size_t free_words_in_vs() const;
coleenp@3602 315
coleenp@3602 316 bool initialize();
coleenp@3602 317
coleenp@3602 318 // get space from the virtual space
coleenp@3602 319 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 320
coleenp@3602 321 // Allocate a chunk from the virtual space and return it.
coleenp@3602 322 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 323 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 324
coleenp@3602 325 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 326 // to Virtualspace
coleenp@3602 327 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 328 bool shrink_by(size_t words);
coleenp@3602 329
jmasa@4572 330 // In preparation for deleting this node, remove all the chunks
jmasa@4572 331 // in the node from any freelist.
jmasa@4572 332 void purge(ChunkManager* chunk_manager);
jmasa@4572 333
coleenp@3869 334 #ifdef ASSERT
coleenp@3602 335 // Debug support
coleenp@3602 336 static void verify_virtual_space_total();
coleenp@3602 337 static void verify_virtual_space_count();
coleenp@3602 338 void mangle();
coleenp@3869 339 #endif
coleenp@3602 340
coleenp@3602 341 void print_on(outputStream* st) const;
coleenp@3602 342 };
coleenp@3602 343
coleenp@3602 344 // byte_size is the size of the associated virtualspace.
jmasa@4572 345 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0), _container_count(0) {
zgu@4317 346 // align up to vm allocation granularity
zgu@4317 347 byte_size = align_size_up(byte_size, os::vm_allocation_granularity());
zgu@4317 348
coleenp@4369 349 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
coleenp@4369 350 // configurable address, generally at the top of the Java heap so other
coleenp@4369 351 // memory addresses don't conflict.
coleenp@3602 352 if (DumpSharedSpaces) {
coleenp@4369 353 char* shared_base = (char*)SharedBaseAddress;
coleenp@3602 354 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 355 if (_rs.is_reserved()) {
coleenp@4369 356 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
coleenp@3602 357 } else {
coleenp@4369 358 // Get a mmap region anywhere if the SharedBaseAddress fails.
coleenp@3602 359 _rs = ReservedSpace(byte_size);
coleenp@3602 360 }
coleenp@3602 361 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 362 } else {
coleenp@3602 363 _rs = ReservedSpace(byte_size);
coleenp@3602 364 }
coleenp@3602 365
coleenp@3602 366 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 367 }
coleenp@3602 368
jmasa@4572 369 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
jmasa@4572 370 Metachunk* chunk = first_chunk();
jmasa@4572 371 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 372 while (chunk < invalid_chunk ) {
jmasa@4572 373 assert(chunk->is_free(), "Should be marked free");
jmasa@4572 374 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 375 chunk_manager->remove_chunk(chunk);
jmasa@4572 376 assert(chunk->next() == NULL &&
jmasa@4572 377 chunk->prev() == NULL,
jmasa@4572 378 "Was not removed from its list");
jmasa@4572 379 chunk = (Metachunk*) next;
jmasa@4572 380 }
jmasa@4572 381 }
jmasa@4572 382
jmasa@4572 383 #ifdef ASSERT
jmasa@4572 384 uint VirtualSpaceNode::container_count_slow() {
jmasa@4572 385 uint count = 0;
jmasa@4572 386 Metachunk* chunk = first_chunk();
jmasa@4572 387 Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@4572 388 while (chunk < invalid_chunk ) {
jmasa@4572 389 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@4572 390 // Don't count the chunks on the free lists. Those are
jmasa@4572 391 // still part of the VirtualSpaceNode but not currently
jmasa@4572 392 // counted.
jmasa@4572 393 if (!chunk->is_free()) {
jmasa@4572 394 count++;
jmasa@4572 395 }
jmasa@4572 396 chunk = (Metachunk*) next;
jmasa@4572 397 }
jmasa@4572 398 return count;
jmasa@4572 399 }
jmasa@4572 400 #endif
jmasa@4572 401
coleenp@3602 402 // List of VirtualSpaces for metadata allocation.
coleenp@3602 403 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 404 // for total space in the VirtualSpace.
coleenp@3602 405 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 406 friend class VirtualSpaceNode;
coleenp@3602 407
coleenp@3602 408 enum VirtualSpaceSizes {
coleenp@3602 409 VirtualSpaceSize = 256 * K
coleenp@3602 410 };
coleenp@3602 411
coleenp@3602 412 // Global list of virtual spaces
coleenp@3602 413 // Head of the list
coleenp@3602 414 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 415 // virtual space currently being used for allocations
coleenp@3602 416 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 417 // Free chunk list for all other metadata
coleenp@3602 418 ChunkManager _chunk_manager;
coleenp@3602 419
coleenp@3602 420 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 421 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 422 bool _is_class;
coleenp@3602 423 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 424
coleenp@3602 425 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 426 size_t _virtual_space_total;
coleenp@3602 427 size_t _virtual_space_count;
coleenp@3602 428
coleenp@3602 429 ~VirtualSpaceList();
coleenp@3602 430
coleenp@3602 431 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 432
coleenp@3602 433 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 434 _virtual_space_list = v;
coleenp@3602 435 }
coleenp@3602 436 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 437 _current_virtual_space = v;
coleenp@3602 438 }
coleenp@3602 439
coleenp@3602 440 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 441
coleenp@3602 442 // Get another virtual space and add it to the list. This
coleenp@3602 443 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 444 // and is typically followed by the allocation of a chunk.
coleenp@3602 445 bool grow_vs(size_t vs_word_size);
coleenp@3602 446
coleenp@3602 447 public:
coleenp@3602 448 VirtualSpaceList(size_t word_size);
coleenp@3602 449 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 450
jmasa@4580 451 size_t free_bytes();
jmasa@4580 452
jmasa@3947 453 Metachunk* get_new_chunk(size_t word_size,
jmasa@3947 454 size_t grow_chunks_by_words,
jmasa@3947 455 size_t medium_chunk_bunch);
jmasa@3947 456
jmasa@3947 457 // Get the first chunk for a Metaspace. Used for
jmasa@3947 458 // special cases such as the boot class loader, reflection
jmasa@3947 459 // class loader and anonymous class loader.
jmasa@3947 460 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch);
coleenp@3602 461
coleenp@3602 462 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 463 return _current_virtual_space;
coleenp@3602 464 }
coleenp@3602 465
coleenp@3602 466 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 467 bool is_class() const { return _is_class; }
coleenp@3602 468
coleenp@3602 469 // Allocate the first virtualspace.
coleenp@3602 470 void initialize(size_t word_size);
coleenp@3602 471
coleenp@3602 472 size_t virtual_space_total() { return _virtual_space_total; }
jmasa@4572 473
jmasa@4572 474 void inc_virtual_space_total(size_t v);
jmasa@4572 475 void dec_virtual_space_total(size_t v);
jmasa@4572 476 void inc_virtual_space_count();
jmasa@4572 477 void dec_virtual_space_count();
jmasa@4572 478
jmasa@4572 479 // Unlink empty VirtualSpaceNodes and free it.
jmasa@4572 480 void purge();
coleenp@3602 481
coleenp@3602 482 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 483 // These are global values shared by all Metaspaces
coleenp@3602 484 size_t capacity_words_sum();
coleenp@3602 485 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 486 size_t used_words_sum();
coleenp@3602 487 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 488
coleenp@3602 489 bool contains(const void *ptr);
coleenp@3602 490
coleenp@3602 491 void print_on(outputStream* st) const;
coleenp@3602 492
coleenp@3602 493 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 494 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 495 public:
coleenp@3602 496 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 497 _virtual_spaces(virtual_spaces) {}
coleenp@3602 498
coleenp@3602 499 bool repeat() {
coleenp@3602 500 return _virtual_spaces != NULL;
coleenp@3602 501 }
coleenp@3602 502
coleenp@3602 503 VirtualSpaceNode* get_next() {
coleenp@3602 504 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 505 if (_virtual_spaces != NULL) {
coleenp@3602 506 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 507 }
coleenp@3602 508 return result;
coleenp@3602 509 }
coleenp@3602 510 };
coleenp@3602 511 };
coleenp@3602 512
coleenp@3602 513 class Metadebug : AllStatic {
coleenp@3602 514 // Debugging support for Metaspaces
coleenp@3602 515 static int _deallocate_block_a_lot_count;
coleenp@3602 516 static int _deallocate_chunk_a_lot_count;
coleenp@3602 517 static int _allocation_fail_alot_count;
coleenp@3602 518
coleenp@3602 519 public:
coleenp@3602 520 static int deallocate_block_a_lot_count() {
coleenp@3602 521 return _deallocate_block_a_lot_count;
coleenp@3602 522 }
coleenp@3602 523 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 524 _deallocate_block_a_lot_count = v;
coleenp@3602 525 }
coleenp@3602 526 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 527 _deallocate_block_a_lot_count++;
coleenp@3602 528 }
coleenp@3602 529 static int deallocate_chunk_a_lot_count() {
coleenp@3602 530 return _deallocate_chunk_a_lot_count;
coleenp@3602 531 }
coleenp@3602 532 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 533 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 534 }
coleenp@3602 535 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 536 _deallocate_chunk_a_lot_count++;
coleenp@3602 537 }
coleenp@3602 538
coleenp@3602 539 static void init_allocation_fail_alot_count();
coleenp@3602 540 #ifdef ASSERT
coleenp@3602 541 static bool test_metadata_failure();
coleenp@3602 542 #endif
coleenp@3602 543
coleenp@3602 544 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 545 size_t chunk_word_size);
coleenp@3602 546 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 547 size_t chunk_word_size);
coleenp@3602 548
coleenp@3602 549 };
coleenp@3602 550
coleenp@3602 551 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 552 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 553 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 554
coleenp@3602 555 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 556 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 557 friend class Metaspace;
coleenp@3602 558 friend class Metadebug;
coleenp@3602 559
coleenp@3602 560 private:
jmasa@3947 561
coleenp@3602 562 // protects allocations and contains.
coleenp@3602 563 Mutex* const _lock;
coleenp@3602 564
jmasa@4727 565 // Type of metadata allocated.
jmasa@4727 566 Metaspace::MetadataType _mdtype;
jmasa@4727 567
jmasa@3947 568 // Chunk related size
jmasa@3947 569 size_t _medium_chunk_bunch;
jmasa@3947 570
coleenp@3602 571 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 572 // are done from the current chunk. The list is used for deallocating
coleenp@3602 573 // chunks when the SpaceManager is freed.
jmasa@3761 574 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 575 Metachunk* _current_chunk;
coleenp@3602 576
coleenp@3602 577 // Virtual space where allocation comes from.
coleenp@3602 578 VirtualSpaceList* _vs_list;
coleenp@3602 579
coleenp@3602 580 // Number of small chunks to allocate to a manager
coleenp@3602 581 // If class space manager, small chunks are unlimited
coleenp@3602 582 static uint const _small_chunk_limit;
coleenp@3602 583 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 584
coleenp@3602 585 // Sum of all space in allocated chunks
jmasa@4580 586 size_t _allocated_blocks_words;
jmasa@4580 587
jmasa@4580 588 // Sum of all allocated chunks
jmasa@4580 589 size_t _allocated_chunks_words;
jmasa@4580 590 size_t _allocated_chunks_count;
coleenp@3602 591
coleenp@3602 592 // Free lists of blocks are per SpaceManager since they
coleenp@3602 593 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 594 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 595 // the class loader using the SpaceManager is collected.
coleenp@3602 596 BlockFreelist _block_freelists;
coleenp@3602 597
coleenp@3602 598 // protects virtualspace and chunk expansions
coleenp@3602 599 static const char* _expand_lock_name;
coleenp@3602 600 static const int _expand_lock_rank;
coleenp@3602 601 static Mutex* const _expand_lock;
coleenp@3602 602
jmasa@3947 603 private:
coleenp@3602 604 // Accessors
coleenp@3602 605 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 606 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 607
coleenp@3602 608 BlockFreelist* block_freelists() const {
coleenp@3602 609 return (BlockFreelist*) &_block_freelists;
coleenp@3602 610 }
coleenp@3602 611
jmasa@4727 612 Metaspace::MetadataType mdtype() { return _mdtype; }
coleenp@3602 613 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 614
coleenp@3602 615 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 616 void set_current_chunk(Metachunk* v) {
coleenp@3602 617 _current_chunk = v;
coleenp@3602 618 }
coleenp@3602 619
coleenp@3602 620 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 621
coleenp@3602 622 // Add chunk to the list of chunks in use
coleenp@3602 623 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 624
coleenp@3602 625 Mutex* lock() const { return _lock; }
coleenp@3602 626
jmasa@3947 627 const char* chunk_size_name(ChunkIndex index) const;
jmasa@3947 628
jmasa@3947 629 protected:
jmasa@3947 630 void initialize();
jmasa@3947 631
coleenp@3602 632 public:
jmasa@4727 633 SpaceManager(Metaspace::MetadataType mdtype,
jmasa@4727 634 Mutex* lock,
jmasa@3947 635 VirtualSpaceList* vs_list);
coleenp@3602 636 ~SpaceManager();
coleenp@3602 637
jmasa@3947 638 enum ChunkMultiples {
jmasa@3947 639 MediumChunkMultiple = 4
coleenp@3602 640 };
coleenp@3602 641
coleenp@3602 642 // Accessors
jmasa@3947 643 size_t specialized_chunk_size() { return SpecializedChunk; }
jmasa@3947 644 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; }
jmasa@3947 645 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; }
jmasa@3947 646 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
jmasa@3947 647
jmasa@4580 648 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
jmasa@4580 649 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
jmasa@4580 650 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
jmasa@4580 651 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
jmasa@4580 652
jmasa@3947 653 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@3602 654
coleenp@3602 655 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 656
jmasa@4580 657 // Increment the per Metaspace and global running sums for Metachunks
jmasa@4580 658 // by the given size. This is used when a Metachunk to added to
jmasa@4580 659 // the in-use list.
jmasa@4580 660 void inc_size_metrics(size_t words);
jmasa@4580 661 // Increment the per Metaspace and global running sums Metablocks by the given
jmasa@4580 662 // size. This is used when a Metablock is allocated.
jmasa@4580 663 void inc_used_metrics(size_t words);
jmasa@4580 664 // Delete the portion of the running sums for this SpaceManager. That is,
jmasa@4580 665 // the globals running sums for the Metachunks and Metablocks are
jmasa@4580 666 // decremented for all the Metachunks in-use by this SpaceManager.
jmasa@4580 667 void dec_total_from_size_metrics();
jmasa@4580 668
jmasa@3947 669 // Set the sizes for the initial chunks.
jmasa@3947 670 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 671 size_t* chunk_word_size,
jmasa@3947 672 size_t* class_chunk_word_size);
jmasa@3947 673
coleenp@3602 674 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 675 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 676 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 677 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 678 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 679
coleenp@3602 680 size_t sum_count_in_chunks_in_use();
coleenp@3602 681 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 682
jmasa@3947 683 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@3947 684
coleenp@3602 685 // Block allocation and deallocation.
coleenp@3602 686 // Allocates a block from the current chunk
coleenp@3602 687 MetaWord* allocate(size_t word_size);
coleenp@3602 688
coleenp@3602 689 // Helper for allocations
jmasa@3761 690 MetaWord* allocate_work(size_t word_size);
coleenp@3602 691
coleenp@3602 692 // Returns a block to the per manager freelist
jmasa@3761 693 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 694
coleenp@3602 695 // Based on the allocation size and a minimum chunk size,
coleenp@3602 696 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 697 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 698
coleenp@3602 699 // Called when an allocation from the current chunk fails.
coleenp@3602 700 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 701 // and allocates from that chunk.
jmasa@3761 702 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 703
coleenp@3602 704 // debugging support.
coleenp@3602 705
coleenp@3602 706 void dump(outputStream* const out) const;
coleenp@3602 707 void print_on(outputStream* st) const;
coleenp@3602 708 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 709
coleenp@3602 710 void verify();
jmasa@3892 711 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 712 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 713 #ifdef ASSERT
jmasa@4580 714 void verify_allocated_blocks_words();
coleenp@3602 715 #endif
coleenp@3602 716 };
coleenp@3602 717
coleenp@3602 718 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 719
coleenp@3602 720 const char* SpaceManager::_expand_lock_name =
coleenp@3602 721 "SpaceManager chunk allocation lock";
coleenp@3602 722 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 723 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 724 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 725 SpaceManager::_expand_lock_name,
coleenp@3602 726 Mutex::_allow_vm_block_flag);
coleenp@3602 727
jmasa@4572 728 void VirtualSpaceNode::inc_container_count() {
jmasa@4572 729 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 730 _container_count++;
jmasa@4572 731 assert(_container_count == container_count_slow(),
jmasa@4572 732 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 733 "container_count_slow() " SIZE_FORMAT,
jmasa@4572 734 _container_count, container_count_slow()));
jmasa@4572 735 }
jmasa@4572 736
jmasa@4572 737 void VirtualSpaceNode::dec_container_count() {
jmasa@4572 738 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 739 _container_count--;
jmasa@4572 740 }
jmasa@4572 741
jmasa@4572 742 #ifdef ASSERT
jmasa@4572 743 void VirtualSpaceNode::verify_container_count() {
jmasa@4572 744 assert(_container_count == container_count_slow(),
jmasa@4572 745 err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
jmasa@4572 746 "container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
jmasa@4572 747 }
jmasa@4572 748 #endif
jmasa@4572 749
coleenp@3602 750 // BlockFreelist methods
coleenp@3602 751
coleenp@3602 752 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 753
coleenp@3602 754 BlockFreelist::~BlockFreelist() {
coleenp@3602 755 if (_dictionary != NULL) {
coleenp@3602 756 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 757 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 758 }
coleenp@3602 759 delete _dictionary;
coleenp@3602 760 }
coleenp@3602 761 }
coleenp@3602 762
jmasa@3761 763 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 764 Metablock* block = (Metablock*) p;
jmasa@3761 765 block->set_word_size(word_size);
jmasa@3761 766 block->set_prev(NULL);
jmasa@3761 767 block->set_next(NULL);
jmasa@3761 768
coleenp@3602 769 return block;
coleenp@3602 770 }
coleenp@3602 771
jmasa@3761 772 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 773 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 774 if (dictionary() == NULL) {
jmasa@3761 775 _dictionary = new BlockTreeDictionary();
coleenp@3602 776 }
jmasa@3761 777 dictionary()->return_chunk(free_chunk);
coleenp@3602 778 }
coleenp@3602 779
jmasa@3761 780 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 781 if (dictionary() == NULL) {
coleenp@3602 782 return NULL;
coleenp@3602 783 }
coleenp@3602 784
jmasa@3761 785 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 786 // Dark matter. Too small for dictionary.
coleenp@3602 787 return NULL;
coleenp@3602 788 }
jmasa@3761 789
jmasa@3761 790 Metablock* free_block =
jmasa@3761 791 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 792 if (free_block == NULL) {
jmasa@3761 793 return NULL;
jmasa@3761 794 }
jmasa@3761 795
jmasa@3761 796 return (MetaWord*) free_block;
coleenp@3602 797 }
coleenp@3602 798
coleenp@3602 799 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 800 if (dictionary() == NULL) {
coleenp@3602 801 return;
coleenp@3602 802 }
coleenp@3602 803 dictionary()->print_free_lists(st);
coleenp@3602 804 }
coleenp@3602 805
coleenp@3602 806 // VirtualSpaceNode methods
coleenp@3602 807
coleenp@3602 808 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 809 _rs.release();
jmasa@4572 810 #ifdef ASSERT
jmasa@4572 811 size_t word_size = sizeof(*this) / BytesPerWord;
jmasa@4572 812 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
jmasa@4572 813 #endif
coleenp@3602 814 }
coleenp@3602 815
coleenp@3602 816 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 817 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 818 }
coleenp@3602 819
coleenp@3602 820 // Space committed in the VirtualSpace
coleenp@3602 821 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 822 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 823 }
coleenp@3602 824
jmasa@4580 825 size_t VirtualSpaceNode::free_words_in_vs() const {
jmasa@4580 826 return pointer_delta(end(), top(), sizeof(MetaWord));
jmasa@4580 827 }
coleenp@3602 828
coleenp@3602 829 // Allocates the chunk from the virtual space only.
coleenp@3602 830 // This interface is also used internally for debugging. Not all
coleenp@3602 831 // chunks removed here are necessarily used for allocation.
coleenp@3602 832 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 833 // Bottom of the new chunk
coleenp@3602 834 MetaWord* chunk_limit = top();
coleenp@3602 835 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 836
coleenp@3602 837 if (!is_available(chunk_word_size)) {
coleenp@3602 838 if (TraceMetadataChunkAllocation) {
coleenp@3602 839 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 840 // Dump some information about the virtual space that is nearly full
coleenp@3602 841 print_on(tty);
coleenp@3602 842 }
coleenp@3602 843 return NULL;
coleenp@3602 844 }
coleenp@3602 845
coleenp@3602 846 // Take the space (bump top on the current virtual space).
coleenp@3602 847 inc_top(chunk_word_size);
coleenp@3602 848
jmasa@4572 849 // Initialize the chunk
jmasa@4572 850 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
coleenp@3602 851 return result;
coleenp@3602 852 }
coleenp@3602 853
coleenp@3602 854
coleenp@3602 855 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 856 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 857 size_t bytes = words * BytesPerWord;
coleenp@3602 858 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 859 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 860 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 861 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 862 virtual_space()->print();
coleenp@3602 863 }
coleenp@3602 864 return result;
coleenp@3602 865 }
coleenp@3602 866
coleenp@3602 867 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 868 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 869 size_t bytes = words * BytesPerWord;
coleenp@3602 870 virtual_space()->shrink_by(bytes);
coleenp@3602 871 return true;
coleenp@3602 872 }
coleenp@3602 873
coleenp@3602 874 // Add another chunk to the chunk list.
coleenp@3602 875
coleenp@3602 876 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 877 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 878 Metachunk* result = take_from_committed(chunk_word_size);
jmasa@4572 879 if (result != NULL) {
jmasa@4572 880 inc_container_count();
jmasa@4572 881 }
jmasa@4572 882 return result;
coleenp@3602 883 }
coleenp@3602 884
coleenp@3602 885 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 886 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 887
coleenp@3602 888 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 889
coleenp@3602 890 if (new_chunk == NULL) {
coleenp@3602 891 // Only a small part of the virtualspace is committed when first
coleenp@3602 892 // allocated so committing more here can be expected.
coleenp@3602 893 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 894 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 895 page_size_words);
coleenp@3602 896 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 897 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 898 }
coleenp@3602 899 return new_chunk;
coleenp@3602 900 }
coleenp@3602 901
coleenp@3602 902 bool VirtualSpaceNode::initialize() {
coleenp@3602 903
coleenp@3602 904 if (!_rs.is_reserved()) {
coleenp@3602 905 return false;
coleenp@3602 906 }
coleenp@3602 907
jmasa@3947 908 // An allocation out of this Virtualspace that is larger
jmasa@3947 909 // than an initial commit size can waste that initial committed
jmasa@3947 910 // space.
jmasa@3947 911 size_t committed_byte_size = 0;
coleenp@3602 912 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 913 if (result) {
coleenp@3602 914 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 915 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 916 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 917
coleenp@3603 918 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 919 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 920 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 921 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 922 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 923 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 924 _rs.size() / BytesPerWord));
coleenp@3602 925 }
coleenp@3602 926
coleenp@3602 927 return result;
coleenp@3602 928 }
coleenp@3602 929
coleenp@3602 930 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 931 size_t used = used_words_in_vs();
coleenp@3602 932 size_t capacity = capacity_words_in_vs();
coleenp@3602 933 VirtualSpace* vs = virtual_space();
coleenp@3602 934 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 935 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 936 PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@3947 937 vs, capacity / K,
jmasa@3947 938 capacity == 0 ? 0 : used * 100 / capacity,
coleenp@3602 939 bottom(), top(), end(),
coleenp@3602 940 vs->high_boundary());
coleenp@3602 941 }
coleenp@3602 942
coleenp@3869 943 #ifdef ASSERT
coleenp@3602 944 void VirtualSpaceNode::mangle() {
coleenp@3602 945 size_t word_size = capacity_words_in_vs();
coleenp@3602 946 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 947 }
coleenp@3869 948 #endif // ASSERT
coleenp@3602 949
coleenp@3602 950 // VirtualSpaceList methods
coleenp@3602 951 // Space allocated from the VirtualSpace
coleenp@3602 952
coleenp@3602 953 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 954 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 955 while (iter.repeat()) {
coleenp@3602 956 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 957 delete vsl;
coleenp@3602 958 }
coleenp@3602 959 }
coleenp@3602 960
jmasa@4572 961 void VirtualSpaceList::inc_virtual_space_total(size_t v) {
jmasa@4572 962 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 963 _virtual_space_total = _virtual_space_total + v;
jmasa@4572 964 }
jmasa@4572 965 void VirtualSpaceList::dec_virtual_space_total(size_t v) {
jmasa@4572 966 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 967 _virtual_space_total = _virtual_space_total - v;
jmasa@4572 968 }
jmasa@4572 969
jmasa@4572 970 void VirtualSpaceList::inc_virtual_space_count() {
jmasa@4572 971 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 972 _virtual_space_count++;
jmasa@4572 973 }
jmasa@4572 974 void VirtualSpaceList::dec_virtual_space_count() {
jmasa@4572 975 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 976 _virtual_space_count--;
jmasa@4572 977 }
jmasa@4572 978
jmasa@4572 979 void ChunkManager::remove_chunk(Metachunk* chunk) {
jmasa@4572 980 size_t word_size = chunk->word_size();
jmasa@4572 981 ChunkIndex index = list_index(word_size);
jmasa@4572 982 if (index != HumongousIndex) {
jmasa@4572 983 free_chunks(index)->remove_chunk(chunk);
jmasa@4572 984 } else {
jmasa@4572 985 humongous_dictionary()->remove_chunk(chunk);
jmasa@4572 986 }
jmasa@4572 987
jmasa@4572 988 // Chunk is being removed from the chunks free list.
jmasa@4572 989 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@4572 990 }
jmasa@4572 991
jmasa@4572 992 // Walk the list of VirtualSpaceNodes and delete
jmasa@4572 993 // nodes with a 0 container_count. Remove Metachunks in
jmasa@4572 994 // the node from their respective freelists.
jmasa@4572 995 void VirtualSpaceList::purge() {
jmasa@4572 996 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4572 997 // Don't use a VirtualSpaceListIterator because this
jmasa@4572 998 // list is being changed and a straightforward use of an iterator is not safe.
jmasa@4572 999 VirtualSpaceNode* purged_vsl = NULL;
jmasa@4572 1000 VirtualSpaceNode* prev_vsl = virtual_space_list();
jmasa@4572 1001 VirtualSpaceNode* next_vsl = prev_vsl;
jmasa@4572 1002 while (next_vsl != NULL) {
jmasa@4572 1003 VirtualSpaceNode* vsl = next_vsl;
jmasa@4572 1004 next_vsl = vsl->next();
jmasa@4572 1005 // Don't free the current virtual space since it will likely
jmasa@4572 1006 // be needed soon.
jmasa@4572 1007 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
jmasa@4572 1008 // Unlink it from the list
jmasa@4572 1009 if (prev_vsl == vsl) {
jmasa@4572 1010 // This is the case of the current note being the first note.
jmasa@4572 1011 assert(vsl == virtual_space_list(), "Expected to be the first note");
jmasa@4572 1012 set_virtual_space_list(vsl->next());
jmasa@4572 1013 } else {
jmasa@4572 1014 prev_vsl->set_next(vsl->next());
jmasa@4572 1015 }
jmasa@4572 1016
jmasa@4572 1017 vsl->purge(chunk_manager());
jmasa@4572 1018 dec_virtual_space_total(vsl->reserved()->word_size());
jmasa@4572 1019 dec_virtual_space_count();
jmasa@4572 1020 purged_vsl = vsl;
jmasa@4572 1021 delete vsl;
jmasa@4572 1022 } else {
jmasa@4572 1023 prev_vsl = vsl;
jmasa@4572 1024 }
jmasa@4572 1025 }
jmasa@4572 1026 #ifdef ASSERT
jmasa@4572 1027 if (purged_vsl != NULL) {
jmasa@4572 1028 // List should be stable enough to use an iterator here.
jmasa@4572 1029 VirtualSpaceListIterator iter(virtual_space_list());
jmasa@4572 1030 while (iter.repeat()) {
jmasa@4572 1031 VirtualSpaceNode* vsl = iter.get_next();
jmasa@4572 1032 assert(vsl != purged_vsl, "Purge of vsl failed");
jmasa@4572 1033 }
jmasa@4572 1034 }
jmasa@4572 1035 #endif
jmasa@4572 1036 }
jmasa@4572 1037
coleenp@3602 1038 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 1039 size_t allocated_by_vs = 0;
coleenp@3602 1040 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1041 while (iter.repeat()) {
coleenp@3602 1042 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1043 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 1044 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 1045 }
coleenp@3602 1046 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 1047 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 1048 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 1049 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 1050 size_t used =
coleenp@3602 1051 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 1052 return used;
coleenp@3602 1053 }
coleenp@3602 1054
coleenp@3602 1055 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 1056 // for metadata. This is the upper limit on the capacity
coleenp@3602 1057 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 1058 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 1059 size_t capacity = 0;
coleenp@3602 1060 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1061 while (iter.repeat()) {
coleenp@3602 1062 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 1063 capacity += vsl->capacity_words_in_vs();
coleenp@3602 1064 }
coleenp@3602 1065 return capacity;
coleenp@3602 1066 }
coleenp@3602 1067
coleenp@3602 1068 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 1069 _is_class(false),
coleenp@3602 1070 _virtual_space_list(NULL),
coleenp@3602 1071 _current_virtual_space(NULL),
coleenp@3602 1072 _virtual_space_total(0),
coleenp@3602 1073 _virtual_space_count(0) {
coleenp@3602 1074 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1075 Mutex::_no_safepoint_check_flag);
coleenp@3602 1076 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 1077
jmasa@4497 1078 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1079 _chunk_manager.free_chunks(SmallIndex)->set_size(SmallChunk);
jmasa@4497 1080 _chunk_manager.free_chunks(MediumIndex)->set_size(MediumChunk);
coleenp@3602 1081 assert(initialization_succeeded,
coleenp@3602 1082 " VirtualSpaceList initialization should not fail");
coleenp@3602 1083 }
coleenp@3602 1084
coleenp@3602 1085 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 1086 _is_class(true),
coleenp@3602 1087 _virtual_space_list(NULL),
coleenp@3602 1088 _current_virtual_space(NULL),
coleenp@3602 1089 _virtual_space_total(0),
coleenp@3602 1090 _virtual_space_count(0) {
coleenp@3602 1091 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1092 Mutex::_no_safepoint_check_flag);
coleenp@3602 1093 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 1094 bool succeeded = class_entry->initialize();
jmasa@4497 1095 _chunk_manager.free_chunks(SpecializedIndex)->set_size(SpecializedChunk);
jmasa@4497 1096 _chunk_manager.free_chunks(SmallIndex)->set_size(ClassSmallChunk);
jmasa@4497 1097 _chunk_manager.free_chunks(MediumIndex)->set_size(ClassMediumChunk);
coleenp@3602 1098 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 1099 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 1100 }
coleenp@3602 1101
jmasa@4580 1102 size_t VirtualSpaceList::free_bytes() {
jmasa@4580 1103 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
jmasa@4580 1104 }
jmasa@4580 1105
coleenp@3602 1106 // Allocate another meta virtual space and add it to the list.
coleenp@3602 1107 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 1108 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1109 if (vs_word_size == 0) {
coleenp@3602 1110 return false;
coleenp@3602 1111 }
coleenp@3602 1112 // Reserve the space
coleenp@3602 1113 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 1114 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 1115
coleenp@3602 1116 // Allocate the meta virtual space and initialize it.
coleenp@3602 1117 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 1118 if (!new_entry->initialize()) {
coleenp@3602 1119 delete new_entry;
coleenp@3602 1120 return false;
coleenp@3602 1121 } else {
coleenp@3860 1122 // ensure lock-free iteration sees fully initialized node
coleenp@3860 1123 OrderAccess::storestore();
coleenp@3602 1124 link_vs(new_entry, vs_word_size);
coleenp@3602 1125 return true;
coleenp@3602 1126 }
coleenp@3602 1127 }
coleenp@3602 1128
coleenp@3602 1129 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 1130 if (virtual_space_list() == NULL) {
coleenp@3602 1131 set_virtual_space_list(new_entry);
coleenp@3602 1132 } else {
coleenp@3602 1133 current_virtual_space()->set_next(new_entry);
coleenp@3602 1134 }
coleenp@3602 1135 set_current_virtual_space(new_entry);
coleenp@3602 1136 inc_virtual_space_total(vs_word_size);
coleenp@3602 1137 inc_virtual_space_count();
coleenp@3602 1138 #ifdef ASSERT
coleenp@3602 1139 new_entry->mangle();
coleenp@3602 1140 #endif
coleenp@3602 1141 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 1142 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 1143 vsl->print_on(tty);
coleenp@3602 1144 }
coleenp@3602 1145 }
coleenp@3602 1146
coleenp@3602 1147 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@3947 1148 size_t grow_chunks_by_words,
jmasa@3947 1149 size_t medium_chunk_bunch) {
coleenp@3602 1150
coleenp@3602 1151 // Get a chunk from the chunk freelist
coleenp@3602 1152 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 1153
jmasa@4572 1154 if (next != NULL) {
jmasa@4572 1155 next->container()->inc_container_count();
jmasa@4572 1156 } else {
jmasa@4572 1157 // Allocate a chunk out of the current virtual space.
coleenp@3602 1158 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1159 }
coleenp@3602 1160
coleenp@3602 1161 if (next == NULL) {
coleenp@3602 1162 // Not enough room in current virtual space. Try to commit
coleenp@3602 1163 // more space.
jmasa@3947 1164 size_t expand_vs_by_words = MAX2(medium_chunk_bunch,
jmasa@3947 1165 grow_chunks_by_words);
coleenp@3602 1166 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1167 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 1168 page_size_words);
coleenp@3602 1169 bool vs_expanded =
coleenp@3602 1170 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 1171 if (!vs_expanded) {
coleenp@3602 1172 // Should the capacity of the metaspaces be expanded for
coleenp@3602 1173 // this allocation? If it's the virtual space for classes and is
coleenp@3602 1174 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 1175 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 1176 // Get another virtual space.
coleenp@3602 1177 size_t grow_vs_words =
coleenp@3602 1178 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 1179 if (grow_vs(grow_vs_words)) {
coleenp@3602 1180 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 1181 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 1182 }
coleenp@3602 1183 } else {
coleenp@3602 1184 // Allocation will fail and induce a GC
coleenp@3602 1185 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1186 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 1187 " Fail instead of expand the metaspace");
coleenp@3602 1188 }
coleenp@3602 1189 }
coleenp@3602 1190 } else {
coleenp@3602 1191 // The virtual space expanded, get a new chunk
coleenp@3602 1192 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1193 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 1194 }
coleenp@3602 1195 }
coleenp@3602 1196
jmasa@3947 1197 assert(next == NULL || (next->next() == NULL && next->prev() == NULL),
jmasa@3947 1198 "New chunk is still on some list");
coleenp@3602 1199 return next;
coleenp@3602 1200 }
coleenp@3602 1201
jmasa@3947 1202 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size,
jmasa@3947 1203 size_t chunk_bunch) {
jmasa@3947 1204 // Get a chunk from the chunk freelist
jmasa@3947 1205 Metachunk* new_chunk = get_new_chunk(chunk_word_size,
jmasa@3947 1206 chunk_word_size,
jmasa@3947 1207 chunk_bunch);
jmasa@3947 1208 return new_chunk;
jmasa@3947 1209 }
jmasa@3947 1210
coleenp@3602 1211 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1212 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1213 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1214 while (iter.repeat()) {
coleenp@3602 1215 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1216 node->print_on(st);
coleenp@3602 1217 }
coleenp@3602 1218 }
coleenp@3602 1219 }
coleenp@3602 1220
coleenp@3602 1221 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1222 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1223 VirtualSpaceListIterator iter(list);
coleenp@3602 1224 while (iter.repeat()) {
coleenp@3602 1225 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1226 if (node->reserved()->contains(ptr)) {
coleenp@3602 1227 return true;
coleenp@3602 1228 }
coleenp@3602 1229 }
coleenp@3602 1230 return false;
coleenp@3602 1231 }
coleenp@3602 1232
coleenp@3602 1233
coleenp@3602 1234 // MetaspaceGC methods
coleenp@3602 1235
coleenp@3602 1236 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1237 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1238 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1239 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1240 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1241 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1242 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1243 //
coleenp@3602 1244 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1245 // resize the capacity of the metaspaces. The current implementation
jmasa@4580 1246 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
coleenp@3602 1247 // to resize the Java heap by some GC's. New flags can be implemented
jmasa@4580 1248 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
coleenp@3602 1249 // free space is desirable in the metaspace capacity to decide how much
jmasa@4146 1250 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
coleenp@3602 1251 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1252 // the HWM.
coleenp@3602 1253
coleenp@3602 1254 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1255 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1256 // another expansion is not requested too soon. If that is not
coleenp@3602 1257 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1258 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1259 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1260 // some.
coleenp@3602 1261 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1262 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1263 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1264 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1265 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1266 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1267 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1268 if (delta_words > min_delta_words) {
coleenp@3602 1269 // Don't want to hit the high water mark on the next
coleenp@3602 1270 // allocation so make the delta greater than just enough
coleenp@3602 1271 // for this allocation.
coleenp@3602 1272 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1273 if (delta_words > max_delta_words) {
coleenp@3602 1274 // This allocation is large but the next ones are probably not
coleenp@3602 1275 // so increase by the minimum.
coleenp@3602 1276 delta_words = delta_words + min_delta_words;
coleenp@3602 1277 }
coleenp@3602 1278 }
coleenp@3602 1279 return delta_words;
coleenp@3602 1280 }
coleenp@3602 1281
coleenp@3602 1282 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
jmasa@4580 1283
jmasa@4580 1284 size_t committed_capacity_bytes = MetaspaceAux::allocated_capacity_bytes();
mgerdin@4355 1285 // If the user wants a limit, impose one.
jmasa@4580 1286 size_t max_metaspace_size_bytes = MaxMetaspaceSize;
jmasa@4580 1287 size_t metaspace_size_bytes = MetaspaceSize;
mgerdin@4355 1288 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
mgerdin@4355 1289 MetaspaceAux::reserved_in_bytes() >= MaxMetaspaceSize) {
mgerdin@4355 1290 return false;
mgerdin@4355 1291 }
coleenp@3602 1292
coleenp@3602 1293 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1294 // metadata virtual space.
coleenp@3602 1295 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1296
coleenp@3602 1297 // If this is part of an allocation after a GC, expand
coleenp@3602 1298 // unconditionally.
jmasa@4580 1299 if (MetaspaceGC::expand_after_GC()) {
coleenp@3602 1300 return true;
coleenp@3602 1301 }
coleenp@3602 1302
jmasa@4580 1303
mgerdin@4355 1304
coleenp@3602 1305 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1306 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1307 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1308 // until that minimum capacity is exceeded.
jmasa@4580 1309 if (committed_capacity_bytes < metaspace_size_bytes ||
coleenp@3602 1310 capacity_until_GC() == 0) {
jmasa@4580 1311 set_capacity_until_GC(metaspace_size_bytes);
coleenp@3602 1312 return true;
coleenp@3602 1313 } else {
jmasa@4580 1314 if (committed_capacity_bytes < capacity_until_GC()) {
coleenp@3602 1315 return true;
coleenp@3602 1316 } else {
coleenp@3602 1317 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1318 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1319 " capacity_until_GC " SIZE_FORMAT
jmasa@4580 1320 " allocated_capacity_bytes " SIZE_FORMAT,
coleenp@3602 1321 word_size,
coleenp@3602 1322 capacity_until_GC(),
jmasa@4580 1323 MetaspaceAux::allocated_capacity_bytes());
coleenp@3602 1324 }
coleenp@3602 1325 return false;
coleenp@3602 1326 }
coleenp@3602 1327 }
coleenp@3602 1328 }
coleenp@3602 1329
jmasa@4580 1330
coleenp@3602 1331
coleenp@3602 1332 void MetaspaceGC::compute_new_size() {
coleenp@3602 1333 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1334 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1335 _shrink_factor = 0;
coleenp@3602 1336
jmasa@4580 1337 // Until a faster way of calculating the "used" quantity is implemented,
jmasa@4580 1338 // use "capacity".
jmasa@4580 1339 const size_t used_after_gc = MetaspaceAux::allocated_capacity_bytes();
jmasa@4580 1340 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
coleenp@3602 1341
jmasa@4146 1342 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1343 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1344
coleenp@3602 1345 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1346 size_t minimum_desired_capacity =
coleenp@3602 1347 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1348 // Don't shrink less than the initial generation size
coleenp@3602 1349 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1350 MetaspaceSize);
coleenp@3602 1351
coleenp@3602 1352 if (PrintGCDetails && Verbose) {
coleenp@3602 1353 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1354 gclog_or_tty->print_cr(" "
coleenp@3602 1355 " minimum_free_percentage: %6.2f"
coleenp@3602 1356 " maximum_used_percentage: %6.2f",
coleenp@3602 1357 minimum_free_percentage,
coleenp@3602 1358 maximum_used_percentage);
coleenp@3602 1359 gclog_or_tty->print_cr(" "
jmasa@4580 1360 " used_after_gc : %6.1fKB",
jmasa@4580 1361 used_after_gc / (double) K);
coleenp@3602 1362 }
coleenp@3602 1363
coleenp@3602 1364
jmasa@4580 1365 size_t shrink_bytes = 0;
coleenp@3602 1366 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1367 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1368 // increment the HWM.
coleenp@3602 1369 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1370 // Don't expand unless it's significant
coleenp@3602 1371 if (expand_bytes >= MinMetaspaceExpansion) {
jmasa@4580 1372 MetaspaceGC::set_capacity_until_GC(capacity_until_GC + expand_bytes);
coleenp@3602 1373 }
coleenp@3602 1374 if (PrintGCDetails && Verbose) {
jmasa@4580 1375 size_t new_capacity_until_GC = capacity_until_GC;
coleenp@3602 1376 gclog_or_tty->print_cr(" expanding:"
jmasa@4580 1377 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1378 " expand_bytes: %6.1fKB"
jmasa@4580 1379 " MinMetaspaceExpansion: %6.1fKB"
jmasa@4580 1380 " new metaspace HWM: %6.1fKB",
coleenp@3602 1381 minimum_desired_capacity / (double) K,
coleenp@3602 1382 expand_bytes / (double) K,
coleenp@3602 1383 MinMetaspaceExpansion / (double) K,
coleenp@3602 1384 new_capacity_until_GC / (double) K);
coleenp@3602 1385 }
coleenp@3602 1386 return;
coleenp@3602 1387 }
coleenp@3602 1388
coleenp@3602 1389 // No expansion, now see if we want to shrink
coleenp@3602 1390 // We would never want to shrink more than this
jmasa@4580 1391 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
jmasa@4580 1392 assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
jmasa@4580 1393 max_shrink_bytes));
coleenp@3602 1394
coleenp@3602 1395 // Should shrinking be considered?
jmasa@4146 1396 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1397 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1398 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1399 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1400 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1401 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1402 MetaspaceSize);
jmasa@4580 1403 if (PrintGCDetails && Verbose) {
coleenp@3602 1404 gclog_or_tty->print_cr(" "
coleenp@3602 1405 " maximum_free_percentage: %6.2f"
coleenp@3602 1406 " minimum_used_percentage: %6.2f",
coleenp@3602 1407 maximum_free_percentage,
coleenp@3602 1408 minimum_used_percentage);
coleenp@3602 1409 gclog_or_tty->print_cr(" "
jmasa@4580 1410 " minimum_desired_capacity: %6.1fKB"
jmasa@4580 1411 " maximum_desired_capacity: %6.1fKB",
coleenp@3602 1412 minimum_desired_capacity / (double) K,
coleenp@3602 1413 maximum_desired_capacity / (double) K);
coleenp@3602 1414 }
coleenp@3602 1415
coleenp@3602 1416 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1417 "sanity check");
coleenp@3602 1418
coleenp@3602 1419 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1420 // Capacity too large, compute shrinking size
jmasa@4580 1421 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1422 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1423 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1424 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1425 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1426 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1427 // size without shrinking, it goes back to 0%.
jmasa@4580 1428 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
jmasa@4580 1429 assert(shrink_bytes <= max_shrink_bytes,
coleenp@3602 1430 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
jmasa@4580 1431 shrink_bytes, max_shrink_bytes));
coleenp@3602 1432 if (current_shrink_factor == 0) {
coleenp@3602 1433 _shrink_factor = 10;
coleenp@3602 1434 } else {
coleenp@3602 1435 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1436 }
coleenp@3602 1437 if (PrintGCDetails && Verbose) {
coleenp@3602 1438 gclog_or_tty->print_cr(" "
coleenp@3602 1439 " shrinking:"
coleenp@3602 1440 " initSize: %.1fK"
coleenp@3602 1441 " maximum_desired_capacity: %.1fK",
coleenp@3602 1442 MetaspaceSize / (double) K,
coleenp@3602 1443 maximum_desired_capacity / (double) K);
coleenp@3602 1444 gclog_or_tty->print_cr(" "
jmasa@4580 1445 " shrink_bytes: %.1fK"
coleenp@3602 1446 " current_shrink_factor: %d"
coleenp@3602 1447 " new shrink factor: %d"
coleenp@3602 1448 " MinMetaspaceExpansion: %.1fK",
jmasa@4580 1449 shrink_bytes / (double) K,
coleenp@3602 1450 current_shrink_factor,
coleenp@3602 1451 _shrink_factor,
coleenp@3602 1452 MinMetaspaceExpansion / (double) K);
coleenp@3602 1453 }
coleenp@3602 1454 }
coleenp@3602 1455 }
coleenp@3602 1456
coleenp@3602 1457 // Don't shrink unless it's significant
jmasa@4580 1458 if (shrink_bytes >= MinMetaspaceExpansion &&
jmasa@4580 1459 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
jmasa@4580 1460 MetaspaceGC::set_capacity_until_GC(capacity_until_GC - shrink_bytes);
coleenp@3602 1461 }
coleenp@3602 1462 }
coleenp@3602 1463
coleenp@3602 1464 // Metadebug methods
coleenp@3602 1465
coleenp@3602 1466 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1467 size_t chunk_word_size){
coleenp@3602 1468 #ifdef ASSERT
coleenp@3602 1469 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1470 if (MetaDataDeallocateALot &&
coleenp@3602 1471 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1472 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1473 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1474 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1475 if (dummy_chunk == NULL) {
coleenp@3602 1476 break;
coleenp@3602 1477 }
coleenp@3602 1478 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1479
coleenp@3602 1480 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1481 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1482 sm->sum_count_in_chunks_in_use());
coleenp@3602 1483 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1484 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1485 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1486 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1487 }
coleenp@3602 1488 }
coleenp@3602 1489 } else {
coleenp@3602 1490 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1491 }
coleenp@3602 1492 #endif
coleenp@3602 1493 }
coleenp@3602 1494
coleenp@3602 1495 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1496 size_t raw_word_size){
coleenp@3602 1497 #ifdef ASSERT
coleenp@3602 1498 if (MetaDataDeallocateALot &&
coleenp@3602 1499 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1500 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1501 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1502 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1503 if (dummy_block == 0) {
coleenp@3602 1504 break;
coleenp@3602 1505 }
jmasa@3761 1506 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1507 }
coleenp@3602 1508 } else {
coleenp@3602 1509 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1510 }
coleenp@3602 1511 #endif
coleenp@3602 1512 }
coleenp@3602 1513
coleenp@3602 1514 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1515 if (MetadataAllocationFailALot) {
coleenp@3602 1516 _allocation_fail_alot_count =
coleenp@3602 1517 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1518 }
coleenp@3602 1519 }
coleenp@3602 1520
coleenp@3602 1521 #ifdef ASSERT
coleenp@3602 1522 bool Metadebug::test_metadata_failure() {
coleenp@3602 1523 if (MetadataAllocationFailALot &&
coleenp@3602 1524 Threads::is_vm_complete()) {
coleenp@3602 1525 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1526 _allocation_fail_alot_count--;
coleenp@3602 1527 } else {
coleenp@3602 1528 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1529 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1530 "MetadataAllocationFailALot");
coleenp@3602 1531 }
coleenp@3602 1532 init_allocation_fail_alot_count();
coleenp@3602 1533 return true;
coleenp@3602 1534 }
coleenp@3602 1535 }
coleenp@3602 1536 return false;
coleenp@3602 1537 }
coleenp@3602 1538 #endif
coleenp@3602 1539
coleenp@3602 1540 // ChunkManager methods
coleenp@3602 1541
coleenp@3602 1542 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1543 // work with the CMS collector because its use of additional locks
coleenp@3602 1544 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1545 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1546
coleenp@3602 1547 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1548 #ifdef ASSERT
coleenp@3602 1549 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1550 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1551 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1552 slow_locked_verify_free_chunks_total();
coleenp@3602 1553 }
coleenp@3602 1554 #endif
coleenp@3602 1555 return _free_chunks_total;
coleenp@3602 1556 }
coleenp@3602 1557
coleenp@3602 1558 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1559 return free_chunks_total() * BytesPerWord;
coleenp@3602 1560 }
coleenp@3602 1561
coleenp@3602 1562 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1563 #ifdef ASSERT
coleenp@3602 1564 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1565 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1566 Mutex::_no_safepoint_check_flag);
coleenp@3602 1567 // This lock is only needed in debug because the verification
coleenp@3602 1568 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1569 slow_locked_verify_free_chunks_count();
coleenp@3602 1570 }
coleenp@3602 1571 #endif
mgerdin@3829 1572 return _free_chunks_count;
coleenp@3602 1573 }
coleenp@3602 1574
coleenp@3602 1575 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1576 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1577 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1578 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1579 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1580 sum_free_chunks()));
coleenp@3602 1581 }
coleenp@3602 1582
coleenp@3602 1583 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1584 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1585 Mutex::_no_safepoint_check_flag);
coleenp@3602 1586 locked_verify_free_chunks_total();
coleenp@3602 1587 }
coleenp@3602 1588
coleenp@3602 1589 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1590 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1591 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1592 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1593 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1594 sum_free_chunks_count()));
coleenp@3602 1595 }
coleenp@3602 1596
coleenp@3602 1597 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1598 #ifdef ASSERT
coleenp@3602 1599 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1600 Mutex::_no_safepoint_check_flag);
coleenp@3602 1601 locked_verify_free_chunks_count();
coleenp@3602 1602 #endif
coleenp@3602 1603 }
coleenp@3602 1604
coleenp@3602 1605 void ChunkManager::verify() {
mgerdin@3829 1606 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1607 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1608 locked_verify();
coleenp@3602 1609 }
coleenp@3602 1610
coleenp@3602 1611 void ChunkManager::locked_verify() {
jmasa@3761 1612 locked_verify_free_chunks_count();
coleenp@3602 1613 locked_verify_free_chunks_total();
coleenp@3602 1614 }
coleenp@3602 1615
coleenp@3602 1616 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1617 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1618 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1619 _free_chunks_total, _free_chunks_count);
coleenp@3602 1620 }
coleenp@3602 1621
coleenp@3602 1622 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1623 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1624 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1625 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1626 }
coleenp@3602 1627 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1628 return &_free_chunks[index];
coleenp@3602 1629 }
coleenp@3602 1630
coleenp@3602 1631 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1632 // methods that are used in product builds.
coleenp@3602 1633 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1634 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1635 size_t result = 0;
jmasa@3947 1636 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1637 ChunkList* list = free_chunks(i);
coleenp@3602 1638
coleenp@3602 1639 if (list == NULL) {
coleenp@3602 1640 continue;
coleenp@3602 1641 }
coleenp@3602 1642
jmasa@4497 1643 result = result + list->count() * list->size();
coleenp@3602 1644 }
jmasa@3761 1645 result = result + humongous_dictionary()->total_size();
coleenp@3602 1646 return result;
coleenp@3602 1647 }
coleenp@3602 1648
coleenp@3602 1649 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1650 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1651 size_t count = 0;
jmasa@3947 1652 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1653 ChunkList* list = free_chunks(i);
coleenp@3602 1654 if (list == NULL) {
coleenp@3602 1655 continue;
coleenp@3602 1656 }
jmasa@4497 1657 count = count + list->count();
coleenp@3602 1658 }
jmasa@3761 1659 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1660 return count;
coleenp@3602 1661 }
coleenp@3602 1662
coleenp@3602 1663 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1664 ChunkIndex index = list_index(word_size);
jmasa@3947 1665 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1666 return free_chunks(index);
coleenp@3602 1667 }
coleenp@3602 1668
coleenp@3602 1669 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1670 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1671 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1672 chunk->set_next(free_list->head());
coleenp@3602 1673 free_list->set_head(chunk);
coleenp@3602 1674 // chunk is being returned to the chunk free list
coleenp@3602 1675 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1676 slow_locked_verify();
coleenp@3602 1677 }
coleenp@3602 1678
coleenp@3602 1679 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1680 // The deallocation of a chunk originates in the freelist
coleenp@3602 1681 // manangement code for a Metaspace and does not hold the
coleenp@3602 1682 // lock.
coleenp@3602 1683 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1684 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1685 slow_locked_verify();
coleenp@3602 1686 if (TraceMetadataChunkAllocation) {
coleenp@3602 1687 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1688 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1689 chunk, chunk->word_size());
coleenp@3602 1690 }
coleenp@3602 1691 free_chunks_put(chunk);
coleenp@3602 1692 }
coleenp@3602 1693
coleenp@3602 1694 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1695 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1696
mgerdin@3829 1697 slow_locked_verify();
jmasa@3761 1698
jmasa@3761 1699 Metachunk* chunk = NULL;
jmasa@3947 1700 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1701 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1702 assert(free_list != NULL, "Sanity check");
jmasa@3761 1703
jmasa@3761 1704 chunk = free_list->head();
jmasa@3761 1705 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1706
jmasa@3761 1707 if (chunk == NULL) {
jmasa@3761 1708 return NULL;
jmasa@3761 1709 }
jmasa@3761 1710
coleenp@3602 1711 // Remove the chunk as the head of the list.
jmasa@4497 1712 free_list->remove_chunk(chunk);
jmasa@3947 1713
jmasa@3947 1714 // Chunk is being removed from the chunks free list.
jmasa@3761 1715 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1716
coleenp@3602 1717 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1718 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1719 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1720 free_list, chunk, chunk->word_size());
coleenp@3602 1721 }
coleenp@3602 1722 } else {
jmasa@3761 1723 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1724 word_size,
jmasa@3761 1725 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1726
jmasa@3761 1727 if (chunk != NULL) {
jmasa@3761 1728 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1729 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1730 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1731 " for requested size " SIZE_FORMAT
jmasa@3761 1732 " waste " SIZE_FORMAT,
jmasa@3761 1733 chunk->word_size(), word_size, waste);
coleenp@3602 1734 }
jmasa@3761 1735 // Chunk is being removed from the chunks free list.
jmasa@3761 1736 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3947 1737 } else {
jmasa@3947 1738 return NULL;
coleenp@3602 1739 }
coleenp@3602 1740 }
jmasa@3947 1741
jmasa@3947 1742 // Remove it from the links to this freelist
jmasa@3947 1743 chunk->set_next(NULL);
jmasa@3947 1744 chunk->set_prev(NULL);
jmasa@4572 1745 #ifdef ASSERT
jmasa@4572 1746 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
jmasa@4572 1747 // work.
jmasa@4572 1748 chunk->set_is_free(false);
jmasa@4572 1749 #endif
mgerdin@3829 1750 slow_locked_verify();
coleenp@3602 1751 return chunk;
coleenp@3602 1752 }
coleenp@3602 1753
coleenp@3602 1754 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1755 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1756 slow_locked_verify();
coleenp@3602 1757
coleenp@3602 1758 // Take from the beginning of the list
coleenp@3602 1759 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1760 if (chunk == NULL) {
coleenp@3602 1761 return NULL;
coleenp@3602 1762 }
coleenp@3602 1763
jmasa@3947 1764 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1765 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1766 "Non-humongous variable sized chunk");
coleenp@3602 1767 if (TraceMetadataChunkAllocation) {
jmasa@3947 1768 size_t list_count;
jmasa@3947 1769 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1770 ChunkList* list = find_free_chunks_list(word_size);
jmasa@4497 1771 list_count = list->count();
jmasa@3947 1772 } else {
jmasa@3947 1773 list_count = humongous_dictionary()->total_count();
jmasa@3947 1774 }
jmasa@3947 1775 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1776 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1777 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1778 locked_print_free_chunks(tty);
coleenp@3602 1779 }
coleenp@3602 1780
coleenp@3602 1781 return chunk;
coleenp@3602 1782 }
coleenp@3602 1783
jmasa@3761 1784 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1785 if (PrintFLSStatistics != 0) {
jmasa@3761 1786 humongous_dictionary()->report_statistics();
jmasa@3761 1787 }
jmasa@3761 1788 }
jmasa@3761 1789
coleenp@3602 1790 // SpaceManager methods
coleenp@3602 1791
jmasa@3947 1792 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1793 size_t* chunk_word_size,
jmasa@3947 1794 size_t* class_chunk_word_size) {
jmasa@3947 1795 switch (type) {
jmasa@3947 1796 case Metaspace::BootMetaspaceType:
jmasa@3947 1797 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1798 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1799 break;
jmasa@3947 1800 case Metaspace::ROMetaspaceType:
jmasa@3947 1801 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1802 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1803 break;
jmasa@3947 1804 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1805 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1806 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1807 break;
jmasa@3947 1808 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1809 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1810 *chunk_word_size = SpecializedChunk;
jmasa@3947 1811 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1812 break;
jmasa@3947 1813 default:
jmasa@3947 1814 *chunk_word_size = SmallChunk;
jmasa@3947 1815 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1816 break;
jmasa@3947 1817 }
mikael@4113 1818 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1819 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1820 " class " SIZE_FORMAT,
mikael@4113 1821 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1822 }
jmasa@3947 1823
coleenp@3602 1824 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1825 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1826 size_t free = 0;
jmasa@3947 1827 for (ChunkIndex i = ZeroIndex; 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 free += chunk->free_word_size();
coleenp@3602 1831 chunk = chunk->next();
coleenp@3602 1832 }
coleenp@3602 1833 }
coleenp@3602 1834 return free;
coleenp@3602 1835 }
coleenp@3602 1836
coleenp@3602 1837 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1838 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1839 size_t result = 0;
jmasa@3947 1840 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1841 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1842 }
jmasa@3761 1843
coleenp@3602 1844 return result;
coleenp@3602 1845 }
coleenp@3602 1846
coleenp@3602 1847 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1848 size_t result = 0;
coleenp@3602 1849 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1850 // Count the free space in all the chunk but not the
coleenp@3602 1851 // current chunk from which allocations are still being done.
coleenp@3602 1852 if (chunk != NULL) {
jmasa@3761 1853 Metachunk* prev = chunk;
jmasa@3761 1854 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1855 result += chunk->free_word_size();
jmasa@3761 1856 prev = chunk;
coleenp@3602 1857 chunk = chunk->next();
coleenp@3602 1858 }
coleenp@3602 1859 }
coleenp@3602 1860 return result;
coleenp@3602 1861 }
coleenp@3602 1862
coleenp@3602 1863 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
jmasa@4580 1864 // For CMS use "allocated_chunks_words()" which does not need the
jmasa@4580 1865 // Metaspace lock. For the other collectors sum over the
jmasa@4580 1866 // lists. Use both methods as a check that "allocated_chunks_words()"
jmasa@4580 1867 // is correct. That is, sum_capacity_in_chunks() is too expensive
jmasa@4580 1868 // to use in the product and allocated_chunks_words() should be used
jmasa@4580 1869 // but allow for checking that allocated_chunks_words() returns the same
jmasa@4580 1870 // value as sum_capacity_in_chunks_in_use() which is the definitive
jmasa@4580 1871 // answer.
jmasa@4580 1872 if (UseConcMarkSweepGC) {
jmasa@4580 1873 return allocated_chunks_words();
jmasa@4580 1874 } else {
jmasa@4580 1875 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
jmasa@4580 1876 size_t sum = 0;
jmasa@4580 1877 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@4580 1878 Metachunk* chunk = chunks_in_use(i);
jmasa@4580 1879 while (chunk != NULL) {
jmasa@4580 1880 sum += chunk->capacity_word_size();
jmasa@4580 1881 chunk = chunk->next();
jmasa@4580 1882 }
coleenp@3602 1883 }
jmasa@4580 1884 return sum;
coleenp@3602 1885 }
coleenp@3602 1886 }
coleenp@3602 1887
coleenp@3602 1888 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1889 size_t count = 0;
jmasa@3947 1890 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1891 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1892 }
jmasa@3761 1893
coleenp@3602 1894 return count;
coleenp@3602 1895 }
coleenp@3602 1896
coleenp@3602 1897 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1898 size_t count = 0;
coleenp@3602 1899 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1900 while (chunk != NULL) {
coleenp@3602 1901 count++;
coleenp@3602 1902 chunk = chunk->next();
coleenp@3602 1903 }
coleenp@3602 1904 return count;
coleenp@3602 1905 }
coleenp@3602 1906
coleenp@3602 1907
coleenp@3602 1908 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1909 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1910 size_t used = 0;
jmasa@3947 1911 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1912 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1913 while (chunk != NULL) {
coleenp@3602 1914 used += chunk->used_word_size();
coleenp@3602 1915 chunk = chunk->next();
coleenp@3602 1916 }
coleenp@3602 1917 }
coleenp@3602 1918 return used;
coleenp@3602 1919 }
coleenp@3602 1920
coleenp@3602 1921 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1922
jmasa@3947 1923 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1924 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1925 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1926 chunk_size_name(i), chunk);
jmasa@3947 1927 if (chunk != NULL) {
jmasa@3947 1928 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1929 chunk->free_word_size());
jmasa@3947 1930 } else {
jmasa@3947 1931 st->print_cr("");
jmasa@3947 1932 }
jmasa@3947 1933 }
coleenp@3602 1934
coleenp@3602 1935 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1936 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1937 }
coleenp@3602 1938
coleenp@3602 1939 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1940
coleenp@3602 1941 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1942 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1943 // once a medium chunk has been allocated, no more small
coleenp@3602 1944 // chunks will be allocated.
coleenp@3602 1945 size_t chunk_word_size;
coleenp@3602 1946 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1947 (!has_small_chunk_limit() ||
coleenp@3602 1948 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
jmasa@3947 1949 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1950 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1951 chunk_word_size = medium_chunk_size();
coleenp@3602 1952 }
coleenp@3602 1953 } else {
jmasa@3947 1954 chunk_word_size = medium_chunk_size();
coleenp@3602 1955 }
coleenp@3602 1956
jmasa@3947 1957 // Might still need a humongous chunk. Enforce an
jmasa@3947 1958 // eight word granularity to facilitate reuse (some
jmasa@3947 1959 // wastage but better chance of reuse).
jmasa@3947 1960 size_t if_humongous_sized_chunk =
jmasa@3947 1961 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1962 HumongousChunkGranularity);
coleenp@3602 1963 chunk_word_size =
jmasa@3947 1964 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1965
jmasa@3947 1966 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1967 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1968 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1969 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1970 word_size, chunk_word_size));
coleenp@3602 1971 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1972 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1973 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1974 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1975 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1976 chunk_word_size);
jmasa@3761 1977 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1978 Metachunk::overhead());
coleenp@3602 1979 }
coleenp@3602 1980 return chunk_word_size;
coleenp@3602 1981 }
coleenp@3602 1982
jmasa@3761 1983 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1984 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1985 "Should have been set");
coleenp@3602 1986 assert(current_chunk() == NULL ||
coleenp@3602 1987 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1988 "Don't need to expand");
coleenp@3602 1989 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1990
coleenp@3602 1991 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1992 size_t words_left = 0;
jmasa@3947 1993 size_t words_used = 0;
jmasa@3947 1994 if (current_chunk() != NULL) {
jmasa@3947 1995 words_left = current_chunk()->free_word_size();
jmasa@3947 1996 words_used = current_chunk()->used_word_size();
jmasa@3947 1997 }
coleenp@3602 1998 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 1999 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 2000 " words left",
jmasa@3947 2001 word_size, words_used, words_left);
coleenp@3602 2002 }
coleenp@3602 2003
coleenp@3602 2004 // Get another chunk out of the virtual space
coleenp@3602 2005 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 2006 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 2007
coleenp@3602 2008 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 2009 // and do an allocation from it.
coleenp@3602 2010 if (next != NULL) {
coleenp@3602 2011 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 2012 // Add to this manager's list of chunks in use.
coleenp@3602 2013 add_chunk(next, false);
coleenp@3602 2014 return next->allocate(word_size);
coleenp@3602 2015 }
coleenp@3602 2016 return NULL;
coleenp@3602 2017 }
coleenp@3602 2018
coleenp@3602 2019 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 2020
jmasa@3947 2021 for (ChunkIndex i = ZeroIndex;
jmasa@3761 2022 i < NumberOfInUseLists ;
coleenp@3602 2023 i = next_chunk_index(i) ) {
coleenp@3602 2024 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 2025 chunks_in_use(i),
coleenp@3602 2026 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 2027 }
coleenp@3602 2028 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 2029 " Humongous " SIZE_FORMAT,
coleenp@3602 2030 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 2031 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 2032 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 2033 // block free lists
jmasa@3761 2034 if (block_freelists() != NULL) {
jmasa@3761 2035 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 2036 block_freelists()->total_size());
jmasa@3761 2037 }
coleenp@3602 2038 }
coleenp@3602 2039
jmasa@4727 2040 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
jmasa@4727 2041 Mutex* lock,
jmasa@3947 2042 VirtualSpaceList* vs_list) :
coleenp@3602 2043 _vs_list(vs_list),
jmasa@4727 2044 _mdtype(mdtype),
jmasa@4580 2045 _allocated_blocks_words(0),
jmasa@4580 2046 _allocated_chunks_words(0),
jmasa@4580 2047 _allocated_chunks_count(0),
jmasa@3947 2048 _lock(lock)
jmasa@3947 2049 {
jmasa@3947 2050 initialize();
jmasa@3947 2051 }
jmasa@3947 2052
jmasa@4580 2053 void SpaceManager::inc_size_metrics(size_t words) {
jmasa@4580 2054 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2055 // Total of allocated Metachunks and allocated Metachunks count
jmasa@4580 2056 // for each SpaceManager
jmasa@4580 2057 _allocated_chunks_words = _allocated_chunks_words + words;
jmasa@4580 2058 _allocated_chunks_count++;
jmasa@4580 2059 // Global total of capacity in allocated Metachunks
jmasa@4727 2060 MetaspaceAux::inc_capacity(mdtype(), words);
jmasa@4580 2061 // Global total of allocated Metablocks.
jmasa@4580 2062 // used_words_slow() includes the overhead in each
jmasa@4580 2063 // Metachunk so include it in the used when the
jmasa@4580 2064 // Metachunk is first added (so only added once per
jmasa@4580 2065 // Metachunk).
jmasa@4727 2066 MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
jmasa@4580 2067 }
jmasa@4580 2068
jmasa@4580 2069 void SpaceManager::inc_used_metrics(size_t words) {
jmasa@4580 2070 // Add to the per SpaceManager total
jmasa@4580 2071 Atomic::add_ptr(words, &_allocated_blocks_words);
jmasa@4580 2072 // Add to the global total
jmasa@4727 2073 MetaspaceAux::inc_used(mdtype(), words);
jmasa@4580 2074 }
jmasa@4580 2075
jmasa@4580 2076 void SpaceManager::dec_total_from_size_metrics() {
jmasa@4727 2077 MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
jmasa@4727 2078 MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
jmasa@4580 2079 // Also deduct the overhead per Metachunk
jmasa@4727 2080 MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
jmasa@4580 2081 }
jmasa@4580 2082
jmasa@3947 2083 void SpaceManager::initialize() {
coleenp@3602 2084 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 2085 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2086 _chunks_in_use[i] = NULL;
coleenp@3602 2087 }
coleenp@3602 2088 _current_chunk = NULL;
coleenp@3602 2089 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2090 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2091 }
coleenp@3602 2092 }
coleenp@3602 2093
jmasa@4497 2094 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
jmasa@4497 2095 if (chunks == NULL) {
jmasa@4497 2096 return;
jmasa@4497 2097 }
jmasa@4497 2098 ChunkList* list = free_chunks(index);
jmasa@4497 2099 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
jmasa@4497 2100 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4497 2101 Metachunk* cur = chunks;
jmasa@4497 2102
jmasa@4572 2103 // This returns chunks one at a time. If a new
jmasa@4497 2104 // class List can be created that is a base class
jmasa@4497 2105 // of FreeList then something like FreeList::prepend()
jmasa@4497 2106 // can be used in place of this loop
jmasa@4497 2107 while (cur != NULL) {
jmasa@4572 2108 assert(cur->container() != NULL, "Container should have been set");
jmasa@4572 2109 cur->container()->dec_container_count();
jmasa@4497 2110 // Capture the next link before it is changed
jmasa@4497 2111 // by the call to return_chunk_at_head();
jmasa@4497 2112 Metachunk* next = cur->next();
jmasa@4497 2113 cur->set_is_free(true);
jmasa@4497 2114 list->return_chunk_at_head(cur);
jmasa@4497 2115 cur = next;
jmasa@4497 2116 }
jmasa@4497 2117 }
jmasa@4497 2118
coleenp@3602 2119 SpaceManager::~SpaceManager() {
mgerdin@4349 2120 // This call this->_lock which can't be done while holding expand_lock()
jmasa@4580 2121 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
jmasa@4580 2122 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
jmasa@4580 2123 " allocated_chunks_words() " SIZE_FORMAT,
jmasa@4580 2124 sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
mgerdin@4349 2125
coleenp@3602 2126 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 2127 Mutex::_no_safepoint_check_flag);
coleenp@3602 2128
coleenp@3602 2129 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 2130
mgerdin@3829 2131 chunk_manager->slow_locked_verify();
coleenp@3602 2132
jmasa@4580 2133 dec_total_from_size_metrics();
jmasa@4580 2134
coleenp@3602 2135 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2136 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 2137 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 2138 }
coleenp@3602 2139
jmasa@4572 2140 // Do not mangle freed Metachunks. The chunk size inside Metachunks
jmasa@4572 2141 // is during the freeing of a VirtualSpaceNodes.
coleenp@3869 2142
coleenp@3602 2143 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 2144 // below.
jmasa@4580 2145 chunk_manager->inc_free_chunks_total(allocated_chunks_words(),
coleenp@3602 2146 sum_count_in_chunks_in_use());
coleenp@3602 2147
coleenp@3602 2148 // Add all the chunks in use by this space manager
coleenp@3602 2149 // to the global list of free chunks.
coleenp@3602 2150
jmasa@3947 2151 // Follow each list of chunks-in-use and add them to the
jmasa@3947 2152 // free lists. Each list is NULL terminated.
jmasa@3947 2153
jmasa@3947 2154 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 2155 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2156 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 2157 sum_count_in_chunks_in_use(i),
jmasa@3947 2158 chunk_size_name(i));
jmasa@3947 2159 }
jmasa@3947 2160 Metachunk* chunks = chunks_in_use(i);
jmasa@4497 2161 chunk_manager->return_chunks(i, chunks);
jmasa@3947 2162 set_chunks_in_use(i, NULL);
jmasa@3947 2163 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2164 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@4497 2165 chunk_manager->free_chunks(i)->count(),
jmasa@3947 2166 chunk_size_name(i));
jmasa@3947 2167 }
jmasa@3947 2168 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 2169 }
coleenp@3602 2170
jmasa@3947 2171 // The medium chunk case may be optimized by passing the head and
jmasa@3947 2172 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 2173 // the current chunk but there are probably exceptions.
jmasa@3947 2174
coleenp@3602 2175 // Humongous chunks
jmasa@3947 2176 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2177 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 2178 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 2179 chunk_size_name(HumongousIndex));
jmasa@3947 2180 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 2181 }
coleenp@3602 2182 // Humongous chunks are never the current chunk.
coleenp@3602 2183 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2184
jmasa@3761 2185 while (humongous_chunks != NULL) {
jmasa@3761 2186 #ifdef ASSERT
jmasa@3761 2187 humongous_chunks->set_is_free(true);
jmasa@3761 2188 #endif
jmasa@3947 2189 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2190 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 2191 humongous_chunks,
jmasa@3947 2192 humongous_chunks->word_size());
jmasa@3947 2193 }
jmasa@3947 2194 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 2195 align_size_up(humongous_chunks->word_size(),
jmasa@3947 2196 HumongousChunkGranularity),
jmasa@3947 2197 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 2198 " granularity %d",
jmasa@3947 2199 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 2200 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@4572 2201 humongous_chunks->container()->dec_container_count();
jmasa@3761 2202 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2203 humongous_chunks = next_humongous_chunks;
coleenp@3602 2204 }
jmasa@3947 2205 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2206 gclog_or_tty->print_cr("");
jmasa@3947 2207 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 2208 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 2209 chunk_size_name(HumongousIndex));
jmasa@3947 2210 }
mgerdin@3829 2211 chunk_manager->slow_locked_verify();
coleenp@3602 2212 }
coleenp@3602 2213
jmasa@3947 2214 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 2215 switch (index) {
jmasa@3947 2216 case SpecializedIndex:
jmasa@3947 2217 return "Specialized";
jmasa@3947 2218 case SmallIndex:
jmasa@3947 2219 return "Small";
jmasa@3947 2220 case MediumIndex:
jmasa@3947 2221 return "Medium";
jmasa@3947 2222 case HumongousIndex:
jmasa@3947 2223 return "Humongous";
jmasa@3947 2224 default:
jmasa@3947 2225 return NULL;
jmasa@3947 2226 }
jmasa@3947 2227 }
jmasa@3947 2228
jmasa@3947 2229 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2230 switch (size) {
jmasa@3947 2231 case SpecializedChunk:
jmasa@3947 2232 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2233 "Need branch for ClassSpecializedChunk");
jmasa@3947 2234 return SpecializedIndex;
jmasa@3947 2235 case SmallChunk:
jmasa@3947 2236 case ClassSmallChunk:
jmasa@3947 2237 return SmallIndex;
jmasa@3947 2238 case MediumChunk:
jmasa@3947 2239 case ClassMediumChunk:
jmasa@3947 2240 return MediumIndex;
jmasa@3947 2241 default:
jmasa@3948 2242 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2243 "Not a humongous chunk");
jmasa@3947 2244 return HumongousIndex;
jmasa@3947 2245 }
jmasa@3947 2246 }
jmasa@3947 2247
jmasa@3761 2248 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2249 assert_lock_strong(_lock);
jmasa@3761 2250 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2251 assert(word_size >= min_size,
jmasa@3761 2252 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2253 block_freelists()->return_block(p, word_size);
coleenp@3602 2254 }
coleenp@3602 2255
coleenp@3602 2256 // Adds a chunk to the list of chunks in use.
coleenp@3602 2257 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2258
coleenp@3602 2259 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2260 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2261
coleenp@3602 2262 new_chunk->reset_empty();
coleenp@3602 2263
coleenp@3602 2264 // Find the correct list and and set the current
coleenp@3602 2265 // chunk for that list.
jmasa@3947 2266 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2267
jmasa@3947 2268 if (index != HumongousIndex) {
coleenp@3602 2269 set_current_chunk(new_chunk);
jmasa@3947 2270 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2271 set_chunks_in_use(index, new_chunk);
jmasa@3947 2272 } else {
coleenp@3602 2273 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2274 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2275 // chunk.
coleenp@3602 2276 if (make_current) {
coleenp@3602 2277 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2278 set_current_chunk(new_chunk);
coleenp@3602 2279 }
coleenp@3602 2280 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2281 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2282 // any humongous chunks so will not point to the tail
coleenp@3602 2283 // of the humongous chunks list.
coleenp@3602 2284 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2285 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2286
jmasa@3948 2287 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2288 }
coleenp@3602 2289
jmasa@4580 2290 // Add to the running sum of capacity
jmasa@4580 2291 inc_size_metrics(new_chunk->word_size());
jmasa@4580 2292
coleenp@3602 2293 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2294 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2295 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2296 sum_count_in_chunks_in_use());
coleenp@3602 2297 new_chunk->print_on(gclog_or_tty);
jmasa@4580 2298 if (vs_list() != NULL) {
jmasa@4580 2299 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
jmasa@4580 2300 }
coleenp@3602 2301 }
coleenp@3602 2302 }
coleenp@3602 2303
jmasa@3947 2304 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2305 size_t grow_chunks_by_words) {
jmasa@3947 2306
jmasa@3947 2307 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2308 grow_chunks_by_words,
jmasa@3947 2309 medium_chunk_bunch());
jmasa@3947 2310
jmasa@3947 2311 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2312 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2313 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2314 next->word_size());
jmasa@3947 2315 }
jmasa@3947 2316
jmasa@3947 2317 return next;
jmasa@3947 2318 }
jmasa@3947 2319
coleenp@3602 2320 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2321 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2322
coleenp@3602 2323 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2324 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2325 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2326 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2327
jmasa@3761 2328 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2329
jmasa@3761 2330 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2331 Metablock::min_block_byte_size());
jmasa@3761 2332 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2333 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2334 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2335
coleenp@3602 2336 BlockFreelist* fl = block_freelists();
jmasa@3761 2337 MetaWord* p = NULL;
coleenp@3602 2338 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2339 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2340 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2341 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2342 // for allocations. Do some profiling. JJJ
jmasa@3761 2343 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2344 p = fl->get_block(raw_word_size);
coleenp@3602 2345 }
jmasa@3761 2346 if (p == NULL) {
jmasa@3761 2347 p = allocate_work(raw_word_size);
coleenp@3602 2348 }
coleenp@3602 2349 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2350
jmasa@3761 2351 return p;
coleenp@3602 2352 }
coleenp@3602 2353
coleenp@3602 2354 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2355 // This methods does not know about blocks (Metablocks)
jmasa@3761 2356 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2357 assert_lock_strong(_lock);
coleenp@3602 2358 #ifdef ASSERT
coleenp@3602 2359 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2360 return NULL;
coleenp@3602 2361 }
coleenp@3602 2362 #endif
coleenp@3602 2363 // Is there space in the current chunk?
jmasa@3761 2364 MetaWord* result = NULL;
coleenp@3602 2365
coleenp@3602 2366 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2367 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2368 // of memory if this returns null.
coleenp@3602 2369 if (DumpSharedSpaces) {
coleenp@3602 2370 assert(current_chunk() != NULL, "should never happen");
jmasa@4580 2371 inc_used_metrics(word_size);
coleenp@3602 2372 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2373 }
coleenp@3602 2374 if (current_chunk() != NULL) {
coleenp@3602 2375 result = current_chunk()->allocate(word_size);
coleenp@3602 2376 }
coleenp@3602 2377
coleenp@3602 2378 if (result == NULL) {
coleenp@3602 2379 result = grow_and_allocate(word_size);
coleenp@3602 2380 }
coleenp@3602 2381 if (result > 0) {
jmasa@4580 2382 inc_used_metrics(word_size);
jmasa@3761 2383 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2384 "Head of the list is being allocated");
coleenp@3602 2385 }
coleenp@3602 2386
coleenp@3602 2387 return result;
coleenp@3602 2388 }
coleenp@3602 2389
coleenp@3602 2390 void SpaceManager::verify() {
coleenp@3602 2391 // If there are blocks in the dictionary, then
coleenp@3602 2392 // verfication of chunks does not work since
coleenp@3602 2393 // being in the dictionary alters a chunk.
jmasa@3761 2394 if (block_freelists()->total_size() == 0) {
jmasa@3947 2395 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2396 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2397 while (curr != NULL) {
coleenp@3602 2398 curr->verify();
jmasa@3892 2399 verify_chunk_size(curr);
coleenp@3602 2400 curr = curr->next();
coleenp@3602 2401 }
coleenp@3602 2402 }
coleenp@3602 2403 }
coleenp@3602 2404 }
coleenp@3602 2405
jmasa@3892 2406 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2407 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2408 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2409 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2410 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2411 "Chunk size is wrong");
jmasa@3892 2412 return;
jmasa@3892 2413 }
jmasa@3892 2414
coleenp@3602 2415 #ifdef ASSERT
jmasa@4580 2416 void SpaceManager::verify_allocated_blocks_words() {
coleenp@3602 2417 // Verification is only guaranteed at a safepoint.
jmasa@4580 2418 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
jmasa@4580 2419 "Verification can fail if the applications is running");
jmasa@4580 2420 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
mikael@4113 2421 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2422 " vs " SIZE_FORMAT,
jmasa@4580 2423 allocated_blocks_words(), sum_used_in_chunks_in_use()));
coleenp@3602 2424 }
coleenp@3602 2425
coleenp@3602 2426 #endif
coleenp@3602 2427
coleenp@3602 2428 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2429 size_t curr_total = 0;
coleenp@3602 2430 size_t waste = 0;
coleenp@3602 2431 uint i = 0;
coleenp@3602 2432 size_t used = 0;
coleenp@3602 2433 size_t capacity = 0;
coleenp@3602 2434
coleenp@3602 2435 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2436 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2437 index < NumberOfInUseLists;
coleenp@3602 2438 index = next_chunk_index(index)) {
coleenp@3602 2439 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2440 curr != NULL;
coleenp@3602 2441 curr = curr->next()) {
coleenp@3602 2442 out->print("%d) ", i++);
coleenp@3602 2443 curr->print_on(out);
coleenp@3602 2444 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2445 block_freelists()->print_on(out);
coleenp@3602 2446 }
coleenp@3602 2447 curr_total += curr->word_size();
coleenp@3602 2448 used += curr->used_word_size();
coleenp@3602 2449 capacity += curr->capacity_word_size();
coleenp@3602 2450 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2451 }
coleenp@3602 2452 }
coleenp@3602 2453
jmasa@3947 2454 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2455 // Free space isn't wasted.
coleenp@3602 2456 waste -= free;
coleenp@3602 2457
coleenp@3602 2458 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2459 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2460 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2461 }
coleenp@3602 2462
coleenp@3869 2463 #ifndef PRODUCT
coleenp@3602 2464 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2465 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2466 index < NumberOfInUseLists;
coleenp@3602 2467 index = next_chunk_index(index)) {
coleenp@3602 2468 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2469 curr != NULL;
coleenp@3602 2470 curr = curr->next()) {
coleenp@3602 2471 curr->mangle();
coleenp@3602 2472 }
coleenp@3602 2473 }
coleenp@3602 2474 }
coleenp@3869 2475 #endif // PRODUCT
coleenp@3602 2476
coleenp@3602 2477 // MetaspaceAux
coleenp@3602 2478
jmasa@4580 2479
jmasa@4727 2480 size_t MetaspaceAux::_allocated_capacity_words[] = {0, 0};
jmasa@4727 2481 size_t MetaspaceAux::_allocated_used_words[] = {0, 0};
jmasa@4580 2482
jmasa@4580 2483 size_t MetaspaceAux::free_bytes() {
jmasa@4580 2484 size_t result = 0;
jmasa@4580 2485 if (Metaspace::class_space_list() != NULL) {
jmasa@4580 2486 result = result + Metaspace::class_space_list()->free_bytes();
jmasa@4580 2487 }
jmasa@4580 2488 if (Metaspace::space_list() != NULL) {
jmasa@4580 2489 result = result + Metaspace::space_list()->free_bytes();
jmasa@4580 2490 }
jmasa@4580 2491 return result;
jmasa@4580 2492 }
jmasa@4580 2493
jmasa@4727 2494 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2495 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4727 2496 assert(words <= allocated_capacity_words(mdtype),
jmasa@4580 2497 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4727 2498 " is greater than _allocated_capacity_words[%u] " SIZE_FORMAT,
jmasa@4727 2499 words, mdtype, allocated_capacity_words(mdtype)));
jmasa@4727 2500 _allocated_capacity_words[mdtype] -= words;
jmasa@4580 2501 }
jmasa@4580 2502
jmasa@4727 2503 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2504 assert_lock_strong(SpaceManager::expand_lock());
jmasa@4580 2505 // Needs to be atomic
jmasa@4727 2506 _allocated_capacity_words[mdtype] += words;
jmasa@4580 2507 }
jmasa@4580 2508
jmasa@4727 2509 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4727 2510 assert(words <= allocated_used_words(mdtype),
jmasa@4580 2511 err_msg("About to decrement below 0: words " SIZE_FORMAT
jmasa@4727 2512 " is greater than _allocated_used_words[%u] " SIZE_FORMAT,
jmasa@4727 2513 words, mdtype, allocated_used_words(mdtype)));
jmasa@4580 2514 // For CMS deallocation of the Metaspaces occurs during the
jmasa@4580 2515 // sweep which is a concurrent phase. Protection by the expand_lock()
jmasa@4580 2516 // is not enough since allocation is on a per Metaspace basis
jmasa@4580 2517 // and protected by the Metaspace lock.
jmasa@4580 2518 jlong minus_words = (jlong) - (jlong) words;
jmasa@4727 2519 Atomic::add_ptr(minus_words, &_allocated_used_words[mdtype]);
jmasa@4580 2520 }
jmasa@4580 2521
jmasa@4727 2522 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
jmasa@4580 2523 // _allocated_used_words tracks allocations for
jmasa@4580 2524 // each piece of metadata. Those allocations are
jmasa@4580 2525 // generally done concurrently by different application
jmasa@4580 2526 // threads so must be done atomically.
jmasa@4727 2527 Atomic::add_ptr(words, &_allocated_used_words[mdtype]);
jmasa@4580 2528 }
jmasa@4580 2529
jmasa@4580 2530 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@3607 2531 size_t used = 0;
jmasa@3607 2532 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2533 while (iter.repeat()) {
jmasa@3607 2534 Metaspace* msp = iter.get_next();
jmasa@4580 2535 // Sum allocated_blocks_words for each metaspace
jmasa@3607 2536 if (msp != NULL) {
jmasa@4580 2537 used += msp->used_words_slow(mdtype);
jmasa@3607 2538 }
jmasa@3607 2539 }
jmasa@3607 2540 return used * BytesPerWord;
jmasa@3607 2541 }
jmasa@3607 2542
coleenp@3602 2543 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2544 size_t free = 0;
coleenp@3602 2545 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2546 while (iter.repeat()) {
coleenp@3602 2547 Metaspace* msp = iter.get_next();
coleenp@3602 2548 if (msp != NULL) {
coleenp@3602 2549 free += msp->free_words(mdtype);
coleenp@3602 2550 }
coleenp@3602 2551 }
coleenp@3602 2552 return free * BytesPerWord;
coleenp@3602 2553 }
coleenp@3602 2554
jmasa@4580 2555 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@4580 2556 // Don't count the space in the freelists. That space will be
jmasa@4580 2557 // added to the capacity calculation as needed.
jmasa@4580 2558 size_t capacity = 0;
coleenp@3602 2559 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2560 while (iter.repeat()) {
coleenp@3602 2561 Metaspace* msp = iter.get_next();
coleenp@3602 2562 if (msp != NULL) {
jmasa@4580 2563 capacity += msp->capacity_words_slow(mdtype);
coleenp@3602 2564 }
coleenp@3602 2565 }
coleenp@3602 2566 return capacity * BytesPerWord;
coleenp@3602 2567 }
coleenp@3602 2568
coleenp@3602 2569 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2570 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2571 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2572 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2573 return reserved * BytesPerWord;
coleenp@3602 2574 }
coleenp@3602 2575
jmasa@3947 2576 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
coleenp@3602 2577
coleenp@3602 2578 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2579 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2580 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2581 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2582 chunk->slow_verify();
coleenp@3602 2583 return chunk->free_chunks_total();
coleenp@3602 2584 }
coleenp@3602 2585
coleenp@3602 2586 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2587 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2588 }
coleenp@3602 2589
jmasa@4580 2590 size_t MetaspaceAux::free_chunks_total() {
jmasa@4580 2591 return free_chunks_total(Metaspace::ClassType) +
jmasa@4580 2592 free_chunks_total(Metaspace::NonClassType);
jmasa@4580 2593 }
jmasa@4580 2594
jmasa@4580 2595 size_t MetaspaceAux::free_chunks_total_in_bytes() {
jmasa@4580 2596 return free_chunks_total() * BytesPerWord;
jmasa@4580 2597 }
jmasa@4580 2598
coleenp@3602 2599 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2600 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2601 if (PrintGCDetails && Verbose) {
coleenp@3602 2602 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2603 "->" SIZE_FORMAT
jmasa@4580 2604 "(" SIZE_FORMAT ")",
coleenp@3602 2605 prev_metadata_used,
jmasa@4580 2606 allocated_capacity_bytes(),
coleenp@3602 2607 reserved_in_bytes());
coleenp@3602 2608 } else {
coleenp@3602 2609 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2610 "->" SIZE_FORMAT "K"
jmasa@4580 2611 "(" SIZE_FORMAT "K)",
coleenp@3602 2612 prev_metadata_used / K,
jmasa@4580 2613 allocated_capacity_bytes() / K,
coleenp@3602 2614 reserved_in_bytes()/ K);
coleenp@3602 2615 }
coleenp@3602 2616
coleenp@3602 2617 gclog_or_tty->print("]");
coleenp@3602 2618 }
coleenp@3602 2619
coleenp@3602 2620 // This is printed when PrintGCDetails
coleenp@3602 2621 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2622 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2623 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2624
coleenp@3602 2625 out->print_cr(" Metaspace total "
coleenp@3602 2626 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2627 " reserved " SIZE_FORMAT "K",
jmasa@4580 2628 allocated_capacity_bytes()/K, allocated_used_bytes()/K, reserved_in_bytes()/K);
jmasa@4727 2629
jmasa@4727 2630 out->print_cr(" data space "
jmasa@4727 2631 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4727 2632 " reserved " SIZE_FORMAT "K",
jmasa@4727 2633 allocated_capacity_bytes(nct)/K,
jmasa@4727 2634 allocated_used_bytes(nct)/K,
jmasa@4727 2635 reserved_in_bytes(nct)/K);
jmasa@4727 2636 out->print_cr(" class space "
jmasa@4727 2637 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
jmasa@4727 2638 " reserved " SIZE_FORMAT "K",
jmasa@4727 2639 allocated_capacity_bytes(ct)/K,
jmasa@4727 2640 allocated_used_bytes(ct)/K,
jmasa@4727 2641 reserved_in_bytes(ct)/K);
coleenp@3602 2642 }
coleenp@3602 2643
coleenp@3602 2644 // Print information for class space and data space separately.
coleenp@3602 2645 // This is almost the same as above.
coleenp@3602 2646 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2647 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
jmasa@4580 2648 size_t capacity_bytes = capacity_bytes_slow(mdtype);
jmasa@4580 2649 size_t used_bytes = used_bytes_slow(mdtype);
coleenp@3602 2650 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2651 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2652 free_chunks_capacity_bytes;
coleenp@3602 2653 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2654 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2655 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2656 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2657 used_bytes / K,
coleenp@3602 2658 free_bytes / K,
coleenp@3602 2659 free_chunks_capacity_bytes / K,
coleenp@3602 2660 used_and_free / K,
coleenp@3602 2661 capacity_bytes / K);
mgerdin@4303 2662 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2663 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2664 }
coleenp@3602 2665
coleenp@3602 2666 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2667 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2668
jmasa@3947 2669 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0;
jmasa@3947 2670 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0;
jmasa@3947 2671 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
jmasa@3947 2672 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0;
coleenp@3602 2673
coleenp@3602 2674 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2675 while (iter.repeat()) {
coleenp@3602 2676 Metaspace* msp = iter.get_next();
coleenp@3602 2677 if (msp != NULL) {
jmasa@3947 2678 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2679 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2680 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2681 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2682 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2683 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2684 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2685 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
jmasa@3947 2686
jmasa@3947 2687 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2688 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2689 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2690 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2691 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2692 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2693 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2694 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2695 }
coleenp@3602 2696 }
coleenp@3602 2697 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2698 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2699 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
jmasa@3947 2700 SIZE_FORMAT " medium(s) " SIZE_FORMAT,
jmasa@3947 2701 specialized_count, specialized_waste, small_count,
jmasa@3947 2702 small_waste, medium_count, medium_waste);
jmasa@3947 2703 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2704 SIZE_FORMAT " small(s) " SIZE_FORMAT,
jmasa@3947 2705 cls_specialized_count, cls_specialized_waste,
jmasa@3947 2706 cls_small_count, cls_small_waste);
coleenp@3602 2707 }
coleenp@3602 2708
coleenp@3602 2709 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2710 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2711 out->print_cr("All Metaspace:");
coleenp@3602 2712 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2713 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2714 print_waste(out);
coleenp@3602 2715 }
coleenp@3602 2716
mgerdin@3829 2717 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2718 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2719 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2720 }
mgerdin@3829 2721
jmasa@4580 2722 void MetaspaceAux::verify_capacity() {
jmasa@4580 2723 #ifdef ASSERT
jmasa@4580 2724 size_t running_sum_capacity_bytes = allocated_capacity_bytes();
jmasa@4727 2725 // For purposes of the running sum of capacity, verify against capacity
jmasa@4580 2726 size_t capacity_in_use_bytes = capacity_bytes_slow();
jmasa@4580 2727 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
jmasa@4580 2728 err_msg("allocated_capacity_words() * BytesPerWord " SIZE_FORMAT
jmasa@4580 2729 " capacity_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2730 running_sum_capacity_bytes, capacity_in_use_bytes));
jmasa@4727 2731 for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@4727 2732 i < Metaspace:: MetadataTypeCount;
jmasa@4727 2733 i = (Metaspace::MetadataType)(i + 1)) {
jmasa@4727 2734 size_t capacity_in_use_bytes = capacity_bytes_slow(i);
jmasa@4727 2735 assert(allocated_capacity_bytes(i) == capacity_in_use_bytes,
jmasa@4727 2736 err_msg("allocated_capacity_bytes(%u) " SIZE_FORMAT
jmasa@4727 2737 " capacity_bytes_slow(%u)" SIZE_FORMAT,
jmasa@4727 2738 i, allocated_capacity_bytes(i), i, capacity_in_use_bytes));
jmasa@4727 2739 }
jmasa@4580 2740 #endif
jmasa@4580 2741 }
jmasa@4580 2742
jmasa@4580 2743 void MetaspaceAux::verify_used() {
jmasa@4580 2744 #ifdef ASSERT
jmasa@4580 2745 size_t running_sum_used_bytes = allocated_used_bytes();
jmasa@4727 2746 // For purposes of the running sum of used, verify against used
jmasa@4580 2747 size_t used_in_use_bytes = used_bytes_slow();
jmasa@4580 2748 assert(allocated_used_bytes() == used_in_use_bytes,
jmasa@4580 2749 err_msg("allocated_used_bytes() " SIZE_FORMAT
jmasa@4727 2750 " used_bytes_slow()" SIZE_FORMAT,
jmasa@4580 2751 allocated_used_bytes(), used_in_use_bytes));
jmasa@4727 2752 for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@4727 2753 i < Metaspace:: MetadataTypeCount;
jmasa@4727 2754 i = (Metaspace::MetadataType)(i + 1)) {
jmasa@4727 2755 size_t used_in_use_bytes = used_bytes_slow(i);
jmasa@4727 2756 assert(allocated_used_bytes(i) == used_in_use_bytes,
jmasa@4727 2757 err_msg("allocated_used_bytes(%u) " SIZE_FORMAT
jmasa@4727 2758 " used_bytes_slow(%u)" SIZE_FORMAT,
jmasa@4727 2759 i, allocated_used_bytes(i), i, used_in_use_bytes));
jmasa@4727 2760 }
jmasa@4580 2761 #endif
jmasa@4580 2762 }
jmasa@4580 2763
jmasa@4580 2764 void MetaspaceAux::verify_metrics() {
jmasa@4580 2765 verify_capacity();
jmasa@4580 2766 verify_used();
jmasa@4580 2767 }
jmasa@4580 2768
jmasa@4580 2769
coleenp@3602 2770 // Metaspace methods
coleenp@3602 2771
coleenp@3602 2772 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2773 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2774
jmasa@3947 2775 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2776 initialize(lock, type);
coleenp@3602 2777 }
coleenp@3602 2778
coleenp@3602 2779 Metaspace::~Metaspace() {
coleenp@3602 2780 delete _vsm;
coleenp@3602 2781 delete _class_vsm;
coleenp@3602 2782 }
coleenp@3602 2783
coleenp@3602 2784 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2785 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2786
coleenp@3602 2787 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2788
coleenp@3602 2789 void Metaspace::global_initialize() {
coleenp@3602 2790 // Initialize the alignment for shared spaces.
coleenp@3602 2791 int max_alignment = os::vm_page_size();
coleenp@3602 2792 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2793
coleenp@3602 2794 if (DumpSharedSpaces) {
coleenp@3602 2795 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2796 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2797 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2798 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2799
coleenp@3602 2800 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2801 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2802 // remainder is the misc code and data chunks.
coleenp@3602 2803 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2804 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2805 os::vm_allocation_granularity());
coleenp@3602 2806 size_t word_size = total/wordSize;
coleenp@3602 2807 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2808 } else {
coleenp@3602 2809 // If using shared space, open the file that contains the shared space
coleenp@3602 2810 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2811 // the addresses don't conflict)
coleenp@3602 2812 if (UseSharedSpaces) {
coleenp@3602 2813 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2814 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2815
coleenp@3602 2816 // Open the shared archive file, read and validate the header. If
coleenp@3602 2817 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2818 // disabled and the file is closed.
coleenp@3602 2819 // Map in spaces now also
coleenp@3602 2820 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2821 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2822 } else {
coleenp@3602 2823 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2824 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2825 }
coleenp@3602 2826 }
coleenp@3602 2827
jmasa@3947 2828 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 2829 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 2830 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 2831 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 2832 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 2833 // from there. This size calculated by -version.
jmasa@3947 2834 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
jmasa@3947 2835 (ClassMetaspaceSize/BytesPerWord)*2);
jmasa@3947 2836 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 2837 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2838 // of the boot class loader size.
jmasa@3947 2839 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 2840 // Initialize the list of virtual spaces.
coleenp@3602 2841 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2842 }
coleenp@3602 2843 }
coleenp@3602 2844
coleenp@3602 2845 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2846 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2847 // argument passed in is at the top of the compressed space
coleenp@3602 2848 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2849 // The reserved space size may be bigger because of alignment, esp with UseLargePages
mikael@4113 2850 assert(rs.size() >= ClassMetaspaceSize,
mikael@4113 2851 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize));
coleenp@3602 2852 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2853 }
coleenp@3602 2854
jmasa@3947 2855 void Metaspace::initialize(Mutex* lock,
jmasa@3947 2856 MetaspaceType type) {
coleenp@3602 2857
coleenp@3602 2858 assert(space_list() != NULL,
coleenp@3602 2859 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2860
jmasa@4727 2861 _vsm = new SpaceManager(Metaspace::NonClassType, lock, space_list());
coleenp@3602 2862 if (_vsm == NULL) {
coleenp@3602 2863 return;
coleenp@3602 2864 }
jmasa@3947 2865 size_t word_size;
jmasa@3947 2866 size_t class_word_size;
jmasa@3947 2867 vsm()->get_initial_chunk_sizes(type,
jmasa@3947 2868 &word_size,
jmasa@3947 2869 &class_word_size);
coleenp@3602 2870
coleenp@3602 2871 assert(class_space_list() != NULL,
coleenp@3602 2872 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2873
coleenp@3602 2874 // Allocate SpaceManager for classes.
jmasa@4727 2875 _class_vsm = new SpaceManager(Metaspace::ClassType, lock, class_space_list());
coleenp@3602 2876 if (_class_vsm == NULL) {
coleenp@3602 2877 return;
coleenp@3602 2878 }
coleenp@3602 2879
coleenp@3602 2880 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2881
coleenp@3602 2882 // Allocate chunk for metadata objects
coleenp@3602 2883 Metachunk* new_chunk =
jmasa@3947 2884 space_list()->get_initialization_chunk(word_size,
jmasa@3947 2885 vsm()->medium_chunk_bunch());
coleenp@3602 2886 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2887 if (new_chunk != NULL) {
coleenp@3602 2888 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2889 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2890 }
coleenp@3602 2891
coleenp@3602 2892 // Allocate chunk for class metadata objects
coleenp@3602 2893 Metachunk* class_chunk =
jmasa@3947 2894 class_space_list()->get_initialization_chunk(class_word_size,
jmasa@3947 2895 class_vsm()->medium_chunk_bunch());
coleenp@3602 2896 if (class_chunk != NULL) {
coleenp@3602 2897 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2898 }
coleenp@3602 2899 }
coleenp@3602 2900
jmasa@3947 2901 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 2902 size_t byte_size = word_size * wordSize;
jmasa@3947 2903 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@3947 2904 }
jmasa@3947 2905
coleenp@3602 2906 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2907 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2908 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2909 return class_vsm()->allocate(word_size);
coleenp@3602 2910 } else {
jmasa@3761 2911 return vsm()->allocate(word_size);
coleenp@3602 2912 }
coleenp@3602 2913 }
coleenp@3602 2914
jmasa@3629 2915 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2916 MetaWord* result;
jmasa@3629 2917 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2918 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@4580 2919 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size) * BytesPerWord;
jmasa@4580 2920 MetaspaceGC::inc_capacity_until_GC(delta_bytes);
jmasa@3629 2921 if (PrintGCDetails && Verbose) {
jmasa@3629 2922 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2923 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2924 }
jmasa@3761 2925
jmasa@3629 2926 result = allocate(word_size, mdtype);
jmasa@3629 2927
jmasa@3629 2928 return result;
jmasa@3629 2929 }
jmasa@3629 2930
coleenp@3602 2931 // Space allocated in the Metaspace. This may
coleenp@3602 2932 // be across several metadata virtual spaces.
coleenp@3602 2933 char* Metaspace::bottom() const {
coleenp@3602 2934 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2935 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2936 }
coleenp@3602 2937
jmasa@4580 2938 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
jmasa@4580 2939 // return vsm()->allocated_used_words();
coleenp@3602 2940 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2941 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2942 }
coleenp@3602 2943
coleenp@3602 2944 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2945 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2946 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2947 }
coleenp@3602 2948
coleenp@3602 2949 // Space capacity in the Metaspace. It includes
coleenp@3602 2950 // space in the list of chunks from which allocations
coleenp@3602 2951 // have been made. Don't include space in the global freelist and
coleenp@3602 2952 // in the space available in the dictionary which
coleenp@3602 2953 // is already counted in some chunk.
jmasa@4580 2954 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
coleenp@3602 2955 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2956 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2957 }
coleenp@3602 2958
jmasa@4580 2959 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
jmasa@4580 2960 return used_words_slow(mdtype) * BytesPerWord;
jmasa@4580 2961 }
jmasa@4580 2962
jmasa@4580 2963 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
jmasa@4580 2964 return capacity_words_slow(mdtype) * BytesPerWord;
jmasa@4580 2965 }
jmasa@4580 2966
coleenp@3602 2967 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2968 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2969 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2970 // Don't take Heap_lock
mgerdin@4588 2971 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
jmasa@3761 2972 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2973 // Dark matter. Too small for dictionary.
jmasa@3761 2974 #ifdef ASSERT
jmasa@3761 2975 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2976 #endif
jmasa@3761 2977 return;
jmasa@3761 2978 }
coleenp@3602 2979 if (is_class) {
jmasa@3761 2980 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2981 } else {
jmasa@3761 2982 vsm()->deallocate(ptr, word_size);
coleenp@3602 2983 }
coleenp@3602 2984 } else {
mgerdin@4588 2985 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2986
jmasa@3761 2987 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2988 // Dark matter. Too small for dictionary.
jmasa@3761 2989 #ifdef ASSERT
jmasa@3761 2990 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2991 #endif
jmasa@3761 2992 return;
jmasa@3761 2993 }
coleenp@3602 2994 if (is_class) {
jmasa@3761 2995 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2996 } else {
jmasa@3761 2997 vsm()->deallocate(ptr, word_size);
coleenp@3602 2998 }
coleenp@3602 2999 }
coleenp@3602 3000 }
coleenp@3602 3001
jmasa@3761 3002 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 3003 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 3004 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 3005 assert(false, "Should not allocate with exception pending");
coleenp@3602 3006 return NULL; // caller does a CHECK_NULL too
coleenp@3602 3007 }
coleenp@3602 3008
coleenp@3602 3009 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 3010 MetaWord* result = NULL;
coleenp@3602 3011
coleenp@3602 3012 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 3013 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 3014 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 3015 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 3016 // to revisit this for application class data sharing.
coleenp@3602 3017 if (DumpSharedSpaces) {
coleenp@3602 3018 if (read_only) {
coleenp@3602 3019 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 3020 } else {
coleenp@3602 3021 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 3022 }
coleenp@3602 3023 if (result == NULL) {
coleenp@3602 3024 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 3025 }
jmasa@3761 3026 return Metablock::initialize(result, word_size);
coleenp@3602 3027 }
coleenp@3602 3028
coleenp@3602 3029 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 3030
coleenp@3602 3031 if (result == NULL) {
coleenp@3602 3032 // Try to clean out some memory and retry.
coleenp@3602 3033 result =
jmasa@3761 3034 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 3035 loader_data, word_size, mdtype);
coleenp@3602 3036
coleenp@3602 3037 // If result is still null, we are out of memory.
coleenp@3602 3038 if (result == NULL) {
jmasa@3947 3039 if (Verbose && TraceMetadataChunkAllocation) {
jmasa@3947 3040 gclog_or_tty->print_cr("Metaspace allocation failed for size "
jmasa@3947 3041 SIZE_FORMAT, word_size);
jmasa@3947 3042 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty);
jmasa@3947 3043 MetaspaceAux::dump(gclog_or_tty);
jmasa@3947 3044 }
coleenp@3602 3045 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 3046 report_java_out_of_memory("Metadata space");
coleenp@3602 3047
coleenp@3602 3048 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 3049 JvmtiExport::post_resource_exhausted(
coleenp@3602 3050 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 3051 "Metadata space");
coleenp@3602 3052 }
coleenp@3602 3053 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 3054 }
coleenp@3602 3055 }
jmasa@3761 3056 return Metablock::initialize(result, word_size);
coleenp@3602 3057 }
coleenp@3602 3058
jmasa@4572 3059 void Metaspace::purge() {
jmasa@4572 3060 MutexLockerEx cl(SpaceManager::expand_lock(),
jmasa@4572 3061 Mutex::_no_safepoint_check_flag);
jmasa@4572 3062 space_list()->purge();
jmasa@4572 3063 class_space_list()->purge();
jmasa@4572 3064 }
jmasa@4572 3065
coleenp@3602 3066 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 3067 // Print both class virtual space counts and metaspace.
coleenp@3602 3068 if (Verbose) {
coleenp@3602 3069 vsm()->print_on(out);
coleenp@3602 3070 class_vsm()->print_on(out);
coleenp@3602 3071 }
coleenp@3602 3072 }
coleenp@3602 3073
coleenp@3860 3074 bool Metaspace::contains(const void * ptr) {
coleenp@3602 3075 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 3076 return true;
coleenp@3602 3077 }
coleenp@3860 3078 // This is checked while unlocked. As long as the virtualspaces are added
coleenp@3860 3079 // at the end, the pointer will be in one of them. The virtual spaces
coleenp@3860 3080 // aren't deleted presently. When they are, some sort of locking might
coleenp@3860 3081 // be needed. Note, locking this can cause inversion problems with the
coleenp@3860 3082 // caller in MetaspaceObj::is_metadata() function.
jmasa@4572 3083 return space_list()->contains(ptr) ||
jmasa@4572 3084 class_space_list()->contains(ptr);
coleenp@3602 3085 }
coleenp@3602 3086
coleenp@3602 3087 void Metaspace::verify() {
coleenp@3602 3088 vsm()->verify();
coleenp@3602 3089 class_vsm()->verify();
coleenp@3602 3090 }
coleenp@3602 3091
coleenp@3602 3092 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 3093 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 3094 vsm()->dump(out);
coleenp@3602 3095 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 3096 class_vsm()->dump(out);
coleenp@3602 3097 }