annotate src/share/vm/memory/metaspace.cpp @ 4351:19f9fabd94cc

Merge
author stefank
date Mon, 18 Mar 2013 09:34:58 +0100
parents 15401203db6b 79af1312fc2c
children 7f0cb32dd233
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
coleenp@3602 51 // Parameters for stress mode testing
coleenp@3602 52 const uint metadata_deallocate_a_lot_block = 10;
coleenp@3602 53 const uint metadata_deallocate_a_lock_chunk = 3;
coleenp@3602 54 size_t const allocation_from_dictionary_limit = 64 * K;
coleenp@3602 55
coleenp@3602 56 MetaWord* last_allocated = 0;
coleenp@3602 57
coleenp@3602 58 // Used in declarations in SpaceManager and ChunkManager
coleenp@3602 59 enum ChunkIndex {
jmasa@3947 60 ZeroIndex = 0,
jmasa@3947 61 SpecializedIndex = ZeroIndex,
jmasa@3947 62 SmallIndex = SpecializedIndex + 1,
jmasa@3947 63 MediumIndex = SmallIndex + 1,
jmasa@3947 64 HumongousIndex = MediumIndex + 1,
jmasa@3947 65 NumberOfFreeLists = 3,
jmasa@3947 66 NumberOfInUseLists = 4
jmasa@3947 67 };
jmasa@3947 68
jmasa@3947 69 enum ChunkSizes { // in words.
jmasa@3947 70 ClassSpecializedChunk = 128,
jmasa@3947 71 SpecializedChunk = 128,
jmasa@3947 72 ClassSmallChunk = 256,
jmasa@3947 73 SmallChunk = 512,
jmasa@3947 74 ClassMediumChunk = 1 * K,
jmasa@3947 75 MediumChunk = 8 * K,
jmasa@3947 76 HumongousChunkGranularity = 8
coleenp@3602 77 };
coleenp@3602 78
coleenp@3602 79 static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@3761 80 assert(i < NumberOfInUseLists, "Out of bound");
coleenp@3602 81 return (ChunkIndex) (i+1);
coleenp@3602 82 }
coleenp@3602 83
coleenp@3602 84 // Originally _capacity_until_GC was set to MetaspaceSize here but
coleenp@3602 85 // the default MetaspaceSize before argument processing was being
coleenp@3602 86 // used which was not the desired value. See the code
coleenp@3602 87 // in should_expand() to see how the initialization is handled
coleenp@3602 88 // now.
coleenp@3602 89 size_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@3602 90 bool MetaspaceGC::_expand_after_GC = false;
coleenp@3602 91 uint MetaspaceGC::_shrink_factor = 0;
coleenp@3602 92 bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@3602 93
coleenp@3602 94 // Blocks of space for metadata are allocated out of Metachunks.
coleenp@3602 95 //
coleenp@3602 96 // Metachunk are allocated out of MetadataVirtualspaces and once
coleenp@3602 97 // allocated there is no explicit link between a Metachunk and
coleenp@3602 98 // the MetadataVirtualspaces from which it was allocated.
coleenp@3602 99 //
coleenp@3602 100 // Each SpaceManager maintains a
coleenp@3602 101 // list of the chunks it is using and the current chunk. The current
coleenp@3602 102 // chunk is the chunk from which allocations are done. Space freed in
coleenp@3602 103 // a chunk is placed on the free list of blocks (BlockFreelist) and
coleenp@3602 104 // reused from there.
coleenp@3602 105
coleenp@3602 106 // Pointer to list of Metachunks.
coleenp@3602 107 class ChunkList VALUE_OBJ_CLASS_SPEC {
coleenp@3602 108 // List of free chunks
coleenp@3602 109 Metachunk* _head;
coleenp@3602 110
coleenp@3602 111 public:
coleenp@3602 112 // Constructor
coleenp@3602 113 ChunkList() : _head(NULL) {}
coleenp@3602 114
coleenp@3602 115 // Accessors
coleenp@3602 116 Metachunk* head() { return _head; }
coleenp@3602 117 void set_head(Metachunk* v) { _head = v; }
coleenp@3602 118
coleenp@3602 119 // Link at head of the list
coleenp@3602 120 void add_at_head(Metachunk* head, Metachunk* tail);
coleenp@3602 121 void add_at_head(Metachunk* head);
coleenp@3602 122
coleenp@3602 123 size_t sum_list_size();
coleenp@3602 124 size_t sum_list_count();
coleenp@3602 125 size_t sum_list_capacity();
coleenp@3602 126 };
coleenp@3602 127
coleenp@3602 128 // Manages the global free lists of chunks.
coleenp@3602 129 // Has three lists of free chunks, and a total size and
coleenp@3602 130 // count that includes all three
coleenp@3602 131
coleenp@3602 132 class ChunkManager VALUE_OBJ_CLASS_SPEC {
coleenp@3602 133
coleenp@3602 134 // Free list of chunks of different sizes.
coleenp@3602 135 // SmallChunk
coleenp@3602 136 // MediumChunk
coleenp@3602 137 // HumongousChunk
jmasa@3761 138 ChunkList _free_chunks[NumberOfFreeLists];
jmasa@3761 139
jmasa@3947 140
jmasa@3761 141 // HumongousChunk
jmasa@3761 142 ChunkTreeDictionary _humongous_dictionary;
coleenp@3602 143
coleenp@3602 144 // ChunkManager in all lists of this type
coleenp@3602 145 size_t _free_chunks_total;
coleenp@3602 146 size_t _free_chunks_count;
coleenp@3602 147
coleenp@3602 148 void dec_free_chunks_total(size_t v) {
coleenp@3602 149 assert(_free_chunks_count > 0 &&
coleenp@3602 150 _free_chunks_total > 0,
coleenp@3602 151 "About to go negative");
coleenp@3602 152 Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@3602 153 jlong minus_v = (jlong) - (jlong) v;
coleenp@3602 154 Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@3602 155 }
coleenp@3602 156
coleenp@3602 157 // Debug support
coleenp@3602 158
coleenp@3602 159 size_t sum_free_chunks();
coleenp@3602 160 size_t sum_free_chunks_count();
coleenp@3602 161
coleenp@3602 162 void locked_verify_free_chunks_total();
mgerdin@3829 163 void slow_locked_verify_free_chunks_total() {
mgerdin@3829 164 if (metaspace_slow_verify) {
mgerdin@3829 165 locked_verify_free_chunks_total();
mgerdin@3829 166 }
mgerdin@3829 167 }
coleenp@3602 168 void locked_verify_free_chunks_count();
mgerdin@3829 169 void slow_locked_verify_free_chunks_count() {
mgerdin@3829 170 if (metaspace_slow_verify) {
mgerdin@3829 171 locked_verify_free_chunks_count();
mgerdin@3829 172 }
mgerdin@3829 173 }
coleenp@3602 174 void verify_free_chunks_count();
coleenp@3602 175
coleenp@3602 176 public:
coleenp@3602 177
coleenp@3602 178 ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
coleenp@3602 179
coleenp@3602 180 // add or delete (return) a chunk to the global freelist.
coleenp@3602 181 Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@3602 182 void chunk_freelist_deallocate(Metachunk* chunk);
coleenp@3602 183
jmasa@3947 184 // Map a size to a list index assuming that there are lists
jmasa@3947 185 // for special, small, medium, and humongous chunks.
jmasa@3947 186 static ChunkIndex list_index(size_t size);
jmasa@3947 187
coleenp@3602 188 // Total of the space in the free chunks list
coleenp@3602 189 size_t free_chunks_total();
coleenp@3602 190 size_t free_chunks_total_in_bytes();
coleenp@3602 191
coleenp@3602 192 // Number of chunks in the free chunks list
coleenp@3602 193 size_t free_chunks_count();
coleenp@3602 194
coleenp@3602 195 void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@3602 196 Atomic::add_ptr(count, &_free_chunks_count);
coleenp@3602 197 Atomic::add_ptr(v, &_free_chunks_total);
coleenp@3602 198 }
jmasa@3761 199 ChunkTreeDictionary* humongous_dictionary() {
jmasa@3761 200 return &_humongous_dictionary;
jmasa@3761 201 }
coleenp@3602 202
coleenp@3602 203 ChunkList* free_chunks(ChunkIndex index);
coleenp@3602 204
coleenp@3602 205 // Returns the list for the given chunk word size.
coleenp@3602 206 ChunkList* find_free_chunks_list(size_t word_size);
coleenp@3602 207
coleenp@3602 208 // Add and remove from a list by size. Selects
coleenp@3602 209 // list based on size of chunk.
coleenp@3602 210 void free_chunks_put(Metachunk* chuck);
coleenp@3602 211 Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@3602 212
coleenp@3602 213 // Debug support
coleenp@3602 214 void verify();
mgerdin@3829 215 void slow_verify() {
mgerdin@3829 216 if (metaspace_slow_verify) {
mgerdin@3829 217 verify();
mgerdin@3829 218 }
mgerdin@3829 219 }
coleenp@3602 220 void locked_verify();
mgerdin@3829 221 void slow_locked_verify() {
mgerdin@3829 222 if (metaspace_slow_verify) {
mgerdin@3829 223 locked_verify();
mgerdin@3829 224 }
mgerdin@3829 225 }
coleenp@3602 226 void verify_free_chunks_total();
coleenp@3602 227
coleenp@3602 228 void locked_print_free_chunks(outputStream* st);
coleenp@3602 229 void locked_print_sum_free_chunks(outputStream* st);
jmasa@3761 230
jmasa@3761 231 void print_on(outputStream* st);
coleenp@3602 232 };
coleenp@3602 233
coleenp@3602 234
coleenp@3602 235 // Used to manage the free list of Metablocks (a block corresponds
coleenp@3602 236 // to the allocation of a quantum of metadata).
coleenp@3602 237 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@3761 238 BlockTreeDictionary* _dictionary;
jmasa@3761 239 static Metablock* initialize_free_chunk(MetaWord* p, size_t word_size);
jmasa@3761 240
coleenp@3602 241 // Accessors
jmasa@3761 242 BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@3602 243
coleenp@3602 244 public:
coleenp@3602 245 BlockFreelist();
coleenp@3602 246 ~BlockFreelist();
coleenp@3602 247
coleenp@3602 248 // Get and return a block to the free list
jmasa@3761 249 MetaWord* get_block(size_t word_size);
jmasa@3761 250 void return_block(MetaWord* p, size_t word_size);
jmasa@3761 251
jmasa@3761 252 size_t total_size() {
jmasa@3761 253 if (dictionary() == NULL) {
coleenp@3602 254 return 0;
jmasa@3761 255 } else {
jmasa@3761 256 return dictionary()->total_size();
coleenp@3602 257 }
jmasa@3761 258 }
coleenp@3602 259
coleenp@3602 260 void print_on(outputStream* st) const;
coleenp@3602 261 };
coleenp@3602 262
coleenp@3602 263 class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@3602 264 friend class VirtualSpaceList;
coleenp@3602 265
coleenp@3602 266 // Link to next VirtualSpaceNode
coleenp@3602 267 VirtualSpaceNode* _next;
coleenp@3602 268
coleenp@3602 269 // total in the VirtualSpace
coleenp@3602 270 MemRegion _reserved;
coleenp@3602 271 ReservedSpace _rs;
coleenp@3602 272 VirtualSpace _virtual_space;
coleenp@3602 273 MetaWord* _top;
coleenp@3602 274
coleenp@3602 275 // Convenience functions for logical bottom and end
coleenp@3602 276 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
coleenp@3602 277 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
coleenp@3602 278
coleenp@3602 279 // Convenience functions to access the _virtual_space
coleenp@3602 280 char* low() const { return virtual_space()->low(); }
coleenp@3602 281 char* high() const { return virtual_space()->high(); }
coleenp@3602 282
coleenp@3602 283 public:
coleenp@3602 284
coleenp@3602 285 VirtualSpaceNode(size_t byte_size);
coleenp@3602 286 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {}
coleenp@3602 287 ~VirtualSpaceNode();
coleenp@3602 288
coleenp@3602 289 // address of next available space in _virtual_space;
coleenp@3602 290 // Accessors
coleenp@3602 291 VirtualSpaceNode* next() { return _next; }
coleenp@3602 292 void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@3602 293
coleenp@3602 294 void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@3602 295 void set_top(MetaWord* v) { _top = v; }
coleenp@3602 296
coleenp@3602 297 // Accessors
coleenp@3602 298 MemRegion* reserved() { return &_reserved; }
coleenp@3602 299 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@3602 300
coleenp@3602 301 // Returns true if "word_size" is available in the virtual space
coleenp@3602 302 bool is_available(size_t word_size) { return _top + word_size <= end(); }
coleenp@3602 303
coleenp@3602 304 MetaWord* top() const { return _top; }
coleenp@3602 305 void inc_top(size_t word_size) { _top += word_size; }
coleenp@3602 306
coleenp@3602 307 // used and capacity in this single entry in the list
coleenp@3602 308 size_t used_words_in_vs() const;
coleenp@3602 309 size_t capacity_words_in_vs() const;
coleenp@3602 310
coleenp@3602 311 bool initialize();
coleenp@3602 312
coleenp@3602 313 // get space from the virtual space
coleenp@3602 314 Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@3602 315
coleenp@3602 316 // Allocate a chunk from the virtual space and return it.
coleenp@3602 317 Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@3602 318 Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
coleenp@3602 319
coleenp@3602 320 // Expands/shrinks the committed space in a virtual space. Delegates
coleenp@3602 321 // to Virtualspace
coleenp@3602 322 bool expand_by(size_t words, bool pre_touch = false);
coleenp@3602 323 bool shrink_by(size_t words);
coleenp@3602 324
coleenp@3869 325 #ifdef ASSERT
coleenp@3602 326 // Debug support
coleenp@3602 327 static void verify_virtual_space_total();
coleenp@3602 328 static void verify_virtual_space_count();
coleenp@3602 329 void mangle();
coleenp@3869 330 #endif
coleenp@3602 331
coleenp@3602 332 void print_on(outputStream* st) const;
coleenp@3602 333 };
coleenp@3602 334
coleenp@3602 335 // byte_size is the size of the associated virtualspace.
coleenp@3602 336 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) {
coleenp@3602 337 // This allocates memory with mmap. For DumpSharedspaces, allocate the
coleenp@3602 338 // space at low memory so that other shared images don't conflict.
coleenp@3602 339 // This is the same address as memory needed for UseCompressedOops but
coleenp@3602 340 // compressed oops don't work with CDS (offsets in metadata are wrong), so
coleenp@3602 341 // borrow the same address.
coleenp@3602 342 if (DumpSharedSpaces) {
coleenp@3602 343 char* shared_base = (char*)HeapBaseMinAddress;
coleenp@3602 344 _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
coleenp@3602 345 if (_rs.is_reserved()) {
coleenp@3602 346 assert(_rs.base() == shared_base, "should match");
coleenp@3602 347 } else {
coleenp@3602 348 // If we are dumping the heap, then allocate a wasted block of address
coleenp@3602 349 // space in order to push the heap to a lower address. This extra
coleenp@3602 350 // address range allows for other (or larger) libraries to be loaded
coleenp@3602 351 // without them occupying the space required for the shared spaces.
coleenp@3602 352 uintx reserved = 0;
coleenp@3602 353 uintx block_size = 64*1024*1024;
coleenp@3602 354 while (reserved < SharedDummyBlockSize) {
coleenp@3602 355 char* dummy = os::reserve_memory(block_size);
coleenp@3602 356 reserved += block_size;
coleenp@3602 357 }
coleenp@3602 358 _rs = ReservedSpace(byte_size);
coleenp@3602 359 }
coleenp@3602 360 MetaspaceShared::set_shared_rs(&_rs);
coleenp@3602 361 } else {
coleenp@3602 362 _rs = ReservedSpace(byte_size);
coleenp@3602 363 }
coleenp@3602 364
coleenp@3602 365 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
coleenp@3602 366 }
coleenp@3602 367
coleenp@3602 368 // List of VirtualSpaces for metadata allocation.
coleenp@3602 369 // It has a _next link for singly linked list and a MemRegion
coleenp@3602 370 // for total space in the VirtualSpace.
coleenp@3602 371 class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@3602 372 friend class VirtualSpaceNode;
coleenp@3602 373
coleenp@3602 374 enum VirtualSpaceSizes {
coleenp@3602 375 VirtualSpaceSize = 256 * K
coleenp@3602 376 };
coleenp@3602 377
coleenp@3602 378 // Global list of virtual spaces
coleenp@3602 379 // Head of the list
coleenp@3602 380 VirtualSpaceNode* _virtual_space_list;
coleenp@3602 381 // virtual space currently being used for allocations
coleenp@3602 382 VirtualSpaceNode* _current_virtual_space;
coleenp@3602 383 // Free chunk list for all other metadata
coleenp@3602 384 ChunkManager _chunk_manager;
coleenp@3602 385
coleenp@3602 386 // Can this virtual list allocate >1 spaces? Also, used to determine
coleenp@3602 387 // whether to allocate unlimited small chunks in this virtual space
coleenp@3602 388 bool _is_class;
coleenp@3602 389 bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
coleenp@3602 390
coleenp@3602 391 // Sum of space in all virtual spaces and number of virtual spaces
coleenp@3602 392 size_t _virtual_space_total;
coleenp@3602 393 size_t _virtual_space_count;
coleenp@3602 394
coleenp@3602 395 ~VirtualSpaceList();
coleenp@3602 396
coleenp@3602 397 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@3602 398
coleenp@3602 399 void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@3602 400 _virtual_space_list = v;
coleenp@3602 401 }
coleenp@3602 402 void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@3602 403 _current_virtual_space = v;
coleenp@3602 404 }
coleenp@3602 405
coleenp@3602 406 void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size);
coleenp@3602 407
coleenp@3602 408 // Get another virtual space and add it to the list. This
coleenp@3602 409 // is typically prompted by a failed attempt to allocate a chunk
coleenp@3602 410 // and is typically followed by the allocation of a chunk.
coleenp@3602 411 bool grow_vs(size_t vs_word_size);
coleenp@3602 412
coleenp@3602 413 public:
coleenp@3602 414 VirtualSpaceList(size_t word_size);
coleenp@3602 415 VirtualSpaceList(ReservedSpace rs);
coleenp@3602 416
jmasa@3947 417 Metachunk* get_new_chunk(size_t word_size,
jmasa@3947 418 size_t grow_chunks_by_words,
jmasa@3947 419 size_t medium_chunk_bunch);
jmasa@3947 420
jmasa@3947 421 // Get the first chunk for a Metaspace. Used for
jmasa@3947 422 // special cases such as the boot class loader, reflection
jmasa@3947 423 // class loader and anonymous class loader.
jmasa@3947 424 Metachunk* get_initialization_chunk(size_t word_size, size_t chunk_bunch);
coleenp@3602 425
coleenp@3602 426 VirtualSpaceNode* current_virtual_space() {
coleenp@3602 427 return _current_virtual_space;
coleenp@3602 428 }
coleenp@3602 429
coleenp@3602 430 ChunkManager* chunk_manager() { return &_chunk_manager; }
coleenp@3602 431 bool is_class() const { return _is_class; }
coleenp@3602 432
coleenp@3602 433 // Allocate the first virtualspace.
coleenp@3602 434 void initialize(size_t word_size);
coleenp@3602 435
coleenp@3602 436 size_t virtual_space_total() { return _virtual_space_total; }
coleenp@3602 437 void inc_virtual_space_total(size_t v) {
coleenp@3602 438 Atomic::add_ptr(v, &_virtual_space_total);
coleenp@3602 439 }
coleenp@3602 440
coleenp@3602 441 size_t virtual_space_count() { return _virtual_space_count; }
coleenp@3602 442 void inc_virtual_space_count() {
coleenp@3602 443 Atomic::inc_ptr(&_virtual_space_count);
coleenp@3602 444 }
coleenp@3602 445
coleenp@3602 446 // Used and capacity in the entire list of virtual spaces.
coleenp@3602 447 // These are global values shared by all Metaspaces
coleenp@3602 448 size_t capacity_words_sum();
coleenp@3602 449 size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
coleenp@3602 450 size_t used_words_sum();
coleenp@3602 451 size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
coleenp@3602 452
coleenp@3602 453 bool contains(const void *ptr);
coleenp@3602 454
coleenp@3602 455 void print_on(outputStream* st) const;
coleenp@3602 456
coleenp@3602 457 class VirtualSpaceListIterator : public StackObj {
coleenp@3602 458 VirtualSpaceNode* _virtual_spaces;
coleenp@3602 459 public:
coleenp@3602 460 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@3602 461 _virtual_spaces(virtual_spaces) {}
coleenp@3602 462
coleenp@3602 463 bool repeat() {
coleenp@3602 464 return _virtual_spaces != NULL;
coleenp@3602 465 }
coleenp@3602 466
coleenp@3602 467 VirtualSpaceNode* get_next() {
coleenp@3602 468 VirtualSpaceNode* result = _virtual_spaces;
coleenp@3602 469 if (_virtual_spaces != NULL) {
coleenp@3602 470 _virtual_spaces = _virtual_spaces->next();
coleenp@3602 471 }
coleenp@3602 472 return result;
coleenp@3602 473 }
coleenp@3602 474 };
coleenp@3602 475 };
coleenp@3602 476
coleenp@3602 477 class Metadebug : AllStatic {
coleenp@3602 478 // Debugging support for Metaspaces
coleenp@3602 479 static int _deallocate_block_a_lot_count;
coleenp@3602 480 static int _deallocate_chunk_a_lot_count;
coleenp@3602 481 static int _allocation_fail_alot_count;
coleenp@3602 482
coleenp@3602 483 public:
coleenp@3602 484 static int deallocate_block_a_lot_count() {
coleenp@3602 485 return _deallocate_block_a_lot_count;
coleenp@3602 486 }
coleenp@3602 487 static void set_deallocate_block_a_lot_count(int v) {
coleenp@3602 488 _deallocate_block_a_lot_count = v;
coleenp@3602 489 }
coleenp@3602 490 static void inc_deallocate_block_a_lot_count() {
coleenp@3602 491 _deallocate_block_a_lot_count++;
coleenp@3602 492 }
coleenp@3602 493 static int deallocate_chunk_a_lot_count() {
coleenp@3602 494 return _deallocate_chunk_a_lot_count;
coleenp@3602 495 }
coleenp@3602 496 static void reset_deallocate_chunk_a_lot_count() {
coleenp@3602 497 _deallocate_chunk_a_lot_count = 1;
coleenp@3602 498 }
coleenp@3602 499 static void inc_deallocate_chunk_a_lot_count() {
coleenp@3602 500 _deallocate_chunk_a_lot_count++;
coleenp@3602 501 }
coleenp@3602 502
coleenp@3602 503 static void init_allocation_fail_alot_count();
coleenp@3602 504 #ifdef ASSERT
coleenp@3602 505 static bool test_metadata_failure();
coleenp@3602 506 #endif
coleenp@3602 507
coleenp@3602 508 static void deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 509 size_t chunk_word_size);
coleenp@3602 510 static void deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 511 size_t chunk_word_size);
coleenp@3602 512
coleenp@3602 513 };
coleenp@3602 514
coleenp@3602 515 int Metadebug::_deallocate_block_a_lot_count = 0;
coleenp@3602 516 int Metadebug::_deallocate_chunk_a_lot_count = 0;
coleenp@3602 517 int Metadebug::_allocation_fail_alot_count = 0;
coleenp@3602 518
coleenp@3602 519 // SpaceManager - used by Metaspace to handle allocations
coleenp@3602 520 class SpaceManager : public CHeapObj<mtClass> {
coleenp@3602 521 friend class Metaspace;
coleenp@3602 522 friend class Metadebug;
coleenp@3602 523
coleenp@3602 524 private:
jmasa@3947 525
coleenp@3602 526 // protects allocations and contains.
coleenp@3602 527 Mutex* const _lock;
coleenp@3602 528
jmasa@3947 529 // Chunk related size
jmasa@3947 530 size_t _medium_chunk_bunch;
jmasa@3947 531
coleenp@3602 532 // List of chunks in use by this SpaceManager. Allocations
coleenp@3602 533 // are done from the current chunk. The list is used for deallocating
coleenp@3602 534 // chunks when the SpaceManager is freed.
jmasa@3761 535 Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@3602 536 Metachunk* _current_chunk;
coleenp@3602 537
coleenp@3602 538 // Virtual space where allocation comes from.
coleenp@3602 539 VirtualSpaceList* _vs_list;
coleenp@3602 540
coleenp@3602 541 // Number of small chunks to allocate to a manager
coleenp@3602 542 // If class space manager, small chunks are unlimited
coleenp@3602 543 static uint const _small_chunk_limit;
coleenp@3602 544 bool has_small_chunk_limit() { return !vs_list()->is_class(); }
coleenp@3602 545
coleenp@3602 546 // Sum of all space in allocated chunks
coleenp@3602 547 size_t _allocation_total;
coleenp@3602 548
coleenp@3602 549 // Free lists of blocks are per SpaceManager since they
coleenp@3602 550 // are assumed to be in chunks in use by the SpaceManager
coleenp@3602 551 // and all chunks in use by a SpaceManager are freed when
coleenp@3602 552 // the class loader using the SpaceManager is collected.
coleenp@3602 553 BlockFreelist _block_freelists;
coleenp@3602 554
coleenp@3602 555 // protects virtualspace and chunk expansions
coleenp@3602 556 static const char* _expand_lock_name;
coleenp@3602 557 static const int _expand_lock_rank;
coleenp@3602 558 static Mutex* const _expand_lock;
coleenp@3602 559
jmasa@3947 560 private:
coleenp@3602 561 // Accessors
coleenp@3602 562 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@3602 563 void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; }
coleenp@3602 564
coleenp@3602 565 BlockFreelist* block_freelists() const {
coleenp@3602 566 return (BlockFreelist*) &_block_freelists;
coleenp@3602 567 }
coleenp@3602 568
coleenp@3602 569 VirtualSpaceList* vs_list() const { return _vs_list; }
coleenp@3602 570
coleenp@3602 571 Metachunk* current_chunk() const { return _current_chunk; }
coleenp@3602 572 void set_current_chunk(Metachunk* v) {
coleenp@3602 573 _current_chunk = v;
coleenp@3602 574 }
coleenp@3602 575
coleenp@3602 576 Metachunk* find_current_chunk(size_t word_size);
coleenp@3602 577
coleenp@3602 578 // Add chunk to the list of chunks in use
coleenp@3602 579 void add_chunk(Metachunk* v, bool make_current);
coleenp@3602 580
coleenp@3602 581 Mutex* lock() const { return _lock; }
coleenp@3602 582
jmasa@3947 583 const char* chunk_size_name(ChunkIndex index) const;
jmasa@3947 584
jmasa@3947 585 protected:
jmasa@3947 586 void initialize();
jmasa@3947 587
coleenp@3602 588 public:
jmasa@3947 589 SpaceManager(Mutex* lock,
jmasa@3947 590 VirtualSpaceList* vs_list);
coleenp@3602 591 ~SpaceManager();
coleenp@3602 592
jmasa@3947 593 enum ChunkMultiples {
jmasa@3947 594 MediumChunkMultiple = 4
coleenp@3602 595 };
coleenp@3602 596
coleenp@3602 597 // Accessors
jmasa@3947 598 size_t specialized_chunk_size() { return SpecializedChunk; }
jmasa@3947 599 size_t small_chunk_size() { return (size_t) vs_list()->is_class() ? ClassSmallChunk : SmallChunk; }
jmasa@3947 600 size_t medium_chunk_size() { return (size_t) vs_list()->is_class() ? ClassMediumChunk : MediumChunk; }
jmasa@3947 601 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
jmasa@3947 602
coleenp@3602 603 size_t allocation_total() const { return _allocation_total; }
coleenp@3602 604 void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); }
jmasa@3947 605 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@3602 606
coleenp@3602 607 static Mutex* expand_lock() { return _expand_lock; }
coleenp@3602 608
jmasa@3947 609 // Set the sizes for the initial chunks.
jmasa@3947 610 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 611 size_t* chunk_word_size,
jmasa@3947 612 size_t* class_chunk_word_size);
jmasa@3947 613
coleenp@3602 614 size_t sum_capacity_in_chunks_in_use() const;
coleenp@3602 615 size_t sum_used_in_chunks_in_use() const;
coleenp@3602 616 size_t sum_free_in_chunks_in_use() const;
coleenp@3602 617 size_t sum_waste_in_chunks_in_use() const;
coleenp@3602 618 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@3602 619
coleenp@3602 620 size_t sum_count_in_chunks_in_use();
coleenp@3602 621 size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@3602 622
jmasa@3947 623 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@3947 624
coleenp@3602 625 // Block allocation and deallocation.
coleenp@3602 626 // Allocates a block from the current chunk
coleenp@3602 627 MetaWord* allocate(size_t word_size);
coleenp@3602 628
coleenp@3602 629 // Helper for allocations
jmasa@3761 630 MetaWord* allocate_work(size_t word_size);
coleenp@3602 631
coleenp@3602 632 // Returns a block to the per manager freelist
jmasa@3761 633 void deallocate(MetaWord* p, size_t word_size);
coleenp@3602 634
coleenp@3602 635 // Based on the allocation size and a minimum chunk size,
coleenp@3602 636 // returned chunk size (for expanding space for chunk allocation).
coleenp@3602 637 size_t calc_chunk_size(size_t allocation_word_size);
coleenp@3602 638
coleenp@3602 639 // Called when an allocation from the current chunk fails.
coleenp@3602 640 // Gets a new chunk (may require getting a new virtual space),
coleenp@3602 641 // and allocates from that chunk.
jmasa@3761 642 MetaWord* grow_and_allocate(size_t word_size);
coleenp@3602 643
coleenp@3602 644 // debugging support.
coleenp@3602 645
coleenp@3602 646 void dump(outputStream* const out) const;
coleenp@3602 647 void print_on(outputStream* st) const;
coleenp@3602 648 void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@3602 649
coleenp@3602 650 void verify();
jmasa@3892 651 void verify_chunk_size(Metachunk* chunk);
coleenp@3869 652 NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@3602 653 #ifdef ASSERT
coleenp@3602 654 void verify_allocation_total();
coleenp@3602 655 #endif
coleenp@3602 656 };
coleenp@3602 657
coleenp@3602 658 uint const SpaceManager::_small_chunk_limit = 4;
coleenp@3602 659
coleenp@3602 660 const char* SpaceManager::_expand_lock_name =
coleenp@3602 661 "SpaceManager chunk allocation lock";
coleenp@3602 662 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@3602 663 Mutex* const SpaceManager::_expand_lock =
coleenp@3602 664 new Mutex(SpaceManager::_expand_lock_rank,
coleenp@3602 665 SpaceManager::_expand_lock_name,
coleenp@3602 666 Mutex::_allow_vm_block_flag);
coleenp@3602 667
coleenp@3602 668 // BlockFreelist methods
coleenp@3602 669
coleenp@3602 670 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@3602 671
coleenp@3602 672 BlockFreelist::~BlockFreelist() {
coleenp@3602 673 if (_dictionary != NULL) {
coleenp@3602 674 if (Verbose && TraceMetadataChunkAllocation) {
coleenp@3602 675 _dictionary->print_free_lists(gclog_or_tty);
coleenp@3602 676 }
coleenp@3602 677 delete _dictionary;
coleenp@3602 678 }
coleenp@3602 679 }
coleenp@3602 680
jmasa@3761 681 Metablock* BlockFreelist::initialize_free_chunk(MetaWord* p, size_t word_size) {
jmasa@3761 682 Metablock* block = (Metablock*) p;
jmasa@3761 683 block->set_word_size(word_size);
jmasa@3761 684 block->set_prev(NULL);
jmasa@3761 685 block->set_next(NULL);
jmasa@3761 686
coleenp@3602 687 return block;
coleenp@3602 688 }
coleenp@3602 689
jmasa@3761 690 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
jmasa@3761 691 Metablock* free_chunk = initialize_free_chunk(p, word_size);
coleenp@3602 692 if (dictionary() == NULL) {
jmasa@3761 693 _dictionary = new BlockTreeDictionary();
coleenp@3602 694 }
jmasa@3761 695 dictionary()->return_chunk(free_chunk);
coleenp@3602 696 }
coleenp@3602 697
jmasa@3761 698 MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@3602 699 if (dictionary() == NULL) {
coleenp@3602 700 return NULL;
coleenp@3602 701 }
coleenp@3602 702
jmasa@3761 703 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 704 // Dark matter. Too small for dictionary.
coleenp@3602 705 return NULL;
coleenp@3602 706 }
jmasa@3761 707
jmasa@3761 708 Metablock* free_block =
jmasa@3761 709 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::exactly);
jmasa@3761 710 if (free_block == NULL) {
jmasa@3761 711 return NULL;
jmasa@3761 712 }
jmasa@3761 713
jmasa@3761 714 return (MetaWord*) free_block;
coleenp@3602 715 }
coleenp@3602 716
coleenp@3602 717 void BlockFreelist::print_on(outputStream* st) const {
coleenp@3602 718 if (dictionary() == NULL) {
coleenp@3602 719 return;
coleenp@3602 720 }
coleenp@3602 721 dictionary()->print_free_lists(st);
coleenp@3602 722 }
coleenp@3602 723
coleenp@3602 724 // VirtualSpaceNode methods
coleenp@3602 725
coleenp@3602 726 VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@3602 727 _rs.release();
coleenp@3602 728 }
coleenp@3602 729
coleenp@3602 730 size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@3602 731 return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@3602 732 }
coleenp@3602 733
coleenp@3602 734 // Space committed in the VirtualSpace
coleenp@3602 735 size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@3602 736 return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@3602 737 }
coleenp@3602 738
coleenp@3602 739
coleenp@3602 740 // Allocates the chunk from the virtual space only.
coleenp@3602 741 // This interface is also used internally for debugging. Not all
coleenp@3602 742 // chunks removed here are necessarily used for allocation.
coleenp@3602 743 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@3602 744 // Bottom of the new chunk
coleenp@3602 745 MetaWord* chunk_limit = top();
coleenp@3602 746 assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@3602 747
coleenp@3602 748 if (!is_available(chunk_word_size)) {
coleenp@3602 749 if (TraceMetadataChunkAllocation) {
coleenp@3602 750 tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@3602 751 // Dump some information about the virtual space that is nearly full
coleenp@3602 752 print_on(tty);
coleenp@3602 753 }
coleenp@3602 754 return NULL;
coleenp@3602 755 }
coleenp@3602 756
coleenp@3602 757 // Take the space (bump top on the current virtual space).
coleenp@3602 758 inc_top(chunk_word_size);
coleenp@3602 759
coleenp@3602 760 // Point the chunk at the space
coleenp@3602 761 Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size);
coleenp@3602 762 return result;
coleenp@3602 763 }
coleenp@3602 764
coleenp@3602 765
coleenp@3602 766 // Expand the virtual space (commit more of the reserved space)
coleenp@3602 767 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
coleenp@3602 768 size_t bytes = words * BytesPerWord;
coleenp@3602 769 bool result = virtual_space()->expand_by(bytes, pre_touch);
coleenp@3602 770 if (TraceMetavirtualspaceAllocation && !result) {
coleenp@3602 771 gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
coleenp@3602 772 "for byte size " SIZE_FORMAT, bytes);
coleenp@3602 773 virtual_space()->print();
coleenp@3602 774 }
coleenp@3602 775 return result;
coleenp@3602 776 }
coleenp@3602 777
coleenp@3602 778 // Shrink the virtual space (commit more of the reserved space)
coleenp@3602 779 bool VirtualSpaceNode::shrink_by(size_t words) {
coleenp@3602 780 size_t bytes = words * BytesPerWord;
coleenp@3602 781 virtual_space()->shrink_by(bytes);
coleenp@3602 782 return true;
coleenp@3602 783 }
coleenp@3602 784
coleenp@3602 785 // Add another chunk to the chunk list.
coleenp@3602 786
coleenp@3602 787 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@3602 788 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 789 Metachunk* result = NULL;
coleenp@3602 790
coleenp@3602 791 return take_from_committed(chunk_word_size);
coleenp@3602 792 }
coleenp@3602 793
coleenp@3602 794 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
coleenp@3602 795 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 796
coleenp@3602 797 Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 798
coleenp@3602 799 if (new_chunk == NULL) {
coleenp@3602 800 // Only a small part of the virtualspace is committed when first
coleenp@3602 801 // allocated so committing more here can be expected.
coleenp@3602 802 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 803 size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
coleenp@3602 804 page_size_words);
coleenp@3602 805 expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 806 new_chunk = get_chunk_vs(chunk_word_size);
coleenp@3602 807 }
coleenp@3602 808 return new_chunk;
coleenp@3602 809 }
coleenp@3602 810
coleenp@3602 811 bool VirtualSpaceNode::initialize() {
coleenp@3602 812
coleenp@3602 813 if (!_rs.is_reserved()) {
coleenp@3602 814 return false;
coleenp@3602 815 }
coleenp@3602 816
jmasa@3947 817 // An allocation out of this Virtualspace that is larger
jmasa@3947 818 // than an initial commit size can waste that initial committed
jmasa@3947 819 // space.
jmasa@3947 820 size_t committed_byte_size = 0;
coleenp@3602 821 bool result = virtual_space()->initialize(_rs, committed_byte_size);
coleenp@3602 822 if (result) {
coleenp@3602 823 set_top((MetaWord*)virtual_space()->low());
coleenp@3602 824 set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@3602 825 (HeapWord*)(_rs.base() + _rs.size())));
coleenp@3603 826
coleenp@3603 827 assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@3603 828 err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@3603 829 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@3603 830 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@3603 831 err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@3603 832 " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@3603 833 _rs.size() / BytesPerWord));
coleenp@3602 834 }
coleenp@3602 835
coleenp@3602 836 return result;
coleenp@3602 837 }
coleenp@3602 838
coleenp@3602 839 void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@3602 840 size_t used = used_words_in_vs();
coleenp@3602 841 size_t capacity = capacity_words_in_vs();
coleenp@3602 842 VirtualSpace* vs = virtual_space();
coleenp@3602 843 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@3602 844 "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@3602 845 PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@3947 846 vs, capacity / K,
jmasa@3947 847 capacity == 0 ? 0 : used * 100 / capacity,
coleenp@3602 848 bottom(), top(), end(),
coleenp@3602 849 vs->high_boundary());
coleenp@3602 850 }
coleenp@3602 851
coleenp@3869 852 #ifdef ASSERT
coleenp@3602 853 void VirtualSpaceNode::mangle() {
coleenp@3602 854 size_t word_size = capacity_words_in_vs();
coleenp@3602 855 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@3602 856 }
coleenp@3869 857 #endif // ASSERT
coleenp@3602 858
coleenp@3602 859 // VirtualSpaceList methods
coleenp@3602 860 // Space allocated from the VirtualSpace
coleenp@3602 861
coleenp@3602 862 VirtualSpaceList::~VirtualSpaceList() {
coleenp@3602 863 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 864 while (iter.repeat()) {
coleenp@3602 865 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 866 delete vsl;
coleenp@3602 867 }
coleenp@3602 868 }
coleenp@3602 869
coleenp@3602 870 size_t VirtualSpaceList::used_words_sum() {
coleenp@3602 871 size_t allocated_by_vs = 0;
coleenp@3602 872 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 873 while (iter.repeat()) {
coleenp@3602 874 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 875 // Sum used region [bottom, top) in each virtualspace
coleenp@3602 876 allocated_by_vs += vsl->used_words_in_vs();
coleenp@3602 877 }
coleenp@3602 878 assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
coleenp@3602 879 err_msg("Total in free chunks " SIZE_FORMAT
coleenp@3602 880 " greater than total from virtual_spaces " SIZE_FORMAT,
coleenp@3602 881 allocated_by_vs, chunk_manager()->free_chunks_total()));
coleenp@3602 882 size_t used =
coleenp@3602 883 allocated_by_vs - chunk_manager()->free_chunks_total();
coleenp@3602 884 return used;
coleenp@3602 885 }
coleenp@3602 886
coleenp@3602 887 // Space available in all MetadataVirtualspaces allocated
coleenp@3602 888 // for metadata. This is the upper limit on the capacity
coleenp@3602 889 // of chunks allocated out of all the MetadataVirtualspaces.
coleenp@3602 890 size_t VirtualSpaceList::capacity_words_sum() {
coleenp@3602 891 size_t capacity = 0;
coleenp@3602 892 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 893 while (iter.repeat()) {
coleenp@3602 894 VirtualSpaceNode* vsl = iter.get_next();
coleenp@3602 895 capacity += vsl->capacity_words_in_vs();
coleenp@3602 896 }
coleenp@3602 897 return capacity;
coleenp@3602 898 }
coleenp@3602 899
coleenp@3602 900 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
coleenp@3602 901 _is_class(false),
coleenp@3602 902 _virtual_space_list(NULL),
coleenp@3602 903 _current_virtual_space(NULL),
coleenp@3602 904 _virtual_space_total(0),
coleenp@3602 905 _virtual_space_count(0) {
coleenp@3602 906 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 907 Mutex::_no_safepoint_check_flag);
coleenp@3602 908 bool initialization_succeeded = grow_vs(word_size);
coleenp@3602 909
coleenp@3602 910 assert(initialization_succeeded,
coleenp@3602 911 " VirtualSpaceList initialization should not fail");
coleenp@3602 912 }
coleenp@3602 913
coleenp@3602 914 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@3602 915 _is_class(true),
coleenp@3602 916 _virtual_space_list(NULL),
coleenp@3602 917 _current_virtual_space(NULL),
coleenp@3602 918 _virtual_space_total(0),
coleenp@3602 919 _virtual_space_count(0) {
coleenp@3602 920 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 921 Mutex::_no_safepoint_check_flag);
coleenp@3602 922 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@3602 923 bool succeeded = class_entry->initialize();
coleenp@3602 924 assert(succeeded, " VirtualSpaceList initialization should not fail");
coleenp@3602 925 link_vs(class_entry, rs.size()/BytesPerWord);
coleenp@3602 926 }
coleenp@3602 927
coleenp@3602 928 // Allocate another meta virtual space and add it to the list.
coleenp@3602 929 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
coleenp@3602 930 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 931 if (vs_word_size == 0) {
coleenp@3602 932 return false;
coleenp@3602 933 }
coleenp@3602 934 // Reserve the space
coleenp@3602 935 size_t vs_byte_size = vs_word_size * BytesPerWord;
coleenp@3602 936 assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
coleenp@3602 937
coleenp@3602 938 // Allocate the meta virtual space and initialize it.
coleenp@3602 939 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@3602 940 if (!new_entry->initialize()) {
coleenp@3602 941 delete new_entry;
coleenp@3602 942 return false;
coleenp@3602 943 } else {
coleenp@3860 944 // ensure lock-free iteration sees fully initialized node
coleenp@3860 945 OrderAccess::storestore();
coleenp@3602 946 link_vs(new_entry, vs_word_size);
coleenp@3602 947 return true;
coleenp@3602 948 }
coleenp@3602 949 }
coleenp@3602 950
coleenp@3602 951 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
coleenp@3602 952 if (virtual_space_list() == NULL) {
coleenp@3602 953 set_virtual_space_list(new_entry);
coleenp@3602 954 } else {
coleenp@3602 955 current_virtual_space()->set_next(new_entry);
coleenp@3602 956 }
coleenp@3602 957 set_current_virtual_space(new_entry);
coleenp@3602 958 inc_virtual_space_total(vs_word_size);
coleenp@3602 959 inc_virtual_space_count();
coleenp@3602 960 #ifdef ASSERT
coleenp@3602 961 new_entry->mangle();
coleenp@3602 962 #endif
coleenp@3602 963 if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@3602 964 VirtualSpaceNode* vsl = current_virtual_space();
coleenp@3602 965 vsl->print_on(tty);
coleenp@3602 966 }
coleenp@3602 967 }
coleenp@3602 968
coleenp@3602 969 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@3947 970 size_t grow_chunks_by_words,
jmasa@3947 971 size_t medium_chunk_bunch) {
coleenp@3602 972
coleenp@3602 973 // Get a chunk from the chunk freelist
coleenp@3602 974 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
coleenp@3602 975
coleenp@3602 976 // Allocate a chunk out of the current virtual space.
coleenp@3602 977 if (next == NULL) {
coleenp@3602 978 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 979 }
coleenp@3602 980
coleenp@3602 981 if (next == NULL) {
coleenp@3602 982 // Not enough room in current virtual space. Try to commit
coleenp@3602 983 // more space.
jmasa@3947 984 size_t expand_vs_by_words = MAX2(medium_chunk_bunch,
jmasa@3947 985 grow_chunks_by_words);
coleenp@3602 986 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 987 size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
coleenp@3602 988 page_size_words);
coleenp@3602 989 bool vs_expanded =
coleenp@3602 990 current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
coleenp@3602 991 if (!vs_expanded) {
coleenp@3602 992 // Should the capacity of the metaspaces be expanded for
coleenp@3602 993 // this allocation? If it's the virtual space for classes and is
coleenp@3602 994 // being used for CompressedHeaders, don't allocate a new virtualspace.
coleenp@3602 995 if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
coleenp@3602 996 // Get another virtual space.
coleenp@3602 997 size_t grow_vs_words =
coleenp@3602 998 MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
coleenp@3602 999 if (grow_vs(grow_vs_words)) {
coleenp@3602 1000 // Got it. It's on the list now. Get a chunk from it.
coleenp@3602 1001 next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
coleenp@3602 1002 }
coleenp@3602 1003 } else {
coleenp@3602 1004 // Allocation will fail and induce a GC
coleenp@3602 1005 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1006 gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
coleenp@3602 1007 " Fail instead of expand the metaspace");
coleenp@3602 1008 }
coleenp@3602 1009 }
coleenp@3602 1010 } else {
coleenp@3602 1011 // The virtual space expanded, get a new chunk
coleenp@3602 1012 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@3602 1013 assert(next != NULL, "Just expanded, should succeed");
coleenp@3602 1014 }
coleenp@3602 1015 }
coleenp@3602 1016
jmasa@3947 1017 assert(next == NULL || (next->next() == NULL && next->prev() == NULL),
jmasa@3947 1018 "New chunk is still on some list");
coleenp@3602 1019 return next;
coleenp@3602 1020 }
coleenp@3602 1021
jmasa@3947 1022 Metachunk* VirtualSpaceList::get_initialization_chunk(size_t chunk_word_size,
jmasa@3947 1023 size_t chunk_bunch) {
jmasa@3947 1024 // Get a chunk from the chunk freelist
jmasa@3947 1025 Metachunk* new_chunk = get_new_chunk(chunk_word_size,
jmasa@3947 1026 chunk_word_size,
jmasa@3947 1027 chunk_bunch);
jmasa@3947 1028 return new_chunk;
jmasa@3947 1029 }
jmasa@3947 1030
coleenp@3602 1031 void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@3602 1032 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1033 VirtualSpaceListIterator iter(virtual_space_list());
coleenp@3602 1034 while (iter.repeat()) {
coleenp@3602 1035 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1036 node->print_on(st);
coleenp@3602 1037 }
coleenp@3602 1038 }
coleenp@3602 1039 }
coleenp@3602 1040
coleenp@3602 1041 bool VirtualSpaceList::contains(const void *ptr) {
coleenp@3602 1042 VirtualSpaceNode* list = virtual_space_list();
coleenp@3602 1043 VirtualSpaceListIterator iter(list);
coleenp@3602 1044 while (iter.repeat()) {
coleenp@3602 1045 VirtualSpaceNode* node = iter.get_next();
coleenp@3602 1046 if (node->reserved()->contains(ptr)) {
coleenp@3602 1047 return true;
coleenp@3602 1048 }
coleenp@3602 1049 }
coleenp@3602 1050 return false;
coleenp@3602 1051 }
coleenp@3602 1052
coleenp@3602 1053
coleenp@3602 1054 // MetaspaceGC methods
coleenp@3602 1055
coleenp@3602 1056 // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@3602 1057 // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@3602 1058 // should succeed. If the GC did not free enough space for the metaspace
coleenp@3602 1059 // allocation, the HWM is increased so that another virtualspace will be
coleenp@3602 1060 // allocated for the metadata. With perm gen the increase in the perm
coleenp@3602 1061 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
coleenp@3602 1062 // metaspace policy uses those as the small and large steps for the HWM.
coleenp@3602 1063 //
coleenp@3602 1064 // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@3602 1065 // resize the capacity of the metaspaces. The current implementation
jmasa@4146 1066 // is based on the flags MinMetaspaceFreeRatio and MaxHeapFreeRatio used
coleenp@3602 1067 // to resize the Java heap by some GC's. New flags can be implemented
coleenp@3602 1068 // if really needed. MinHeapFreeRatio is used to calculate how much
coleenp@3602 1069 // free space is desirable in the metaspace capacity to decide how much
jmasa@4146 1070 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
coleenp@3602 1071 // free space is desirable in the metaspace capacity before decreasing
coleenp@3602 1072 // the HWM.
coleenp@3602 1073
coleenp@3602 1074 // Calculate the amount to increase the high water mark (HWM).
coleenp@3602 1075 // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@3602 1076 // another expansion is not requested too soon. If that is not
coleenp@3602 1077 // enough to satisfy the allocation (i.e. big enough for a word_size
coleenp@3602 1078 // allocation), increase by MaxMetaspaceExpansion. If that is still
coleenp@3602 1079 // not enough, expand by the size of the allocation (word_size) plus
coleenp@3602 1080 // some.
coleenp@3602 1081 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
coleenp@3602 1082 size_t before_inc = MetaspaceGC::capacity_until_GC();
coleenp@3602 1083 size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
coleenp@3602 1084 size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
coleenp@3602 1085 size_t page_size_words = os::vm_page_size() / BytesPerWord;
coleenp@3602 1086 size_t size_delta_words = align_size_up(word_size, page_size_words);
coleenp@3602 1087 size_t delta_words = MAX2(size_delta_words, min_delta_words);
coleenp@3602 1088 if (delta_words > min_delta_words) {
coleenp@3602 1089 // Don't want to hit the high water mark on the next
coleenp@3602 1090 // allocation so make the delta greater than just enough
coleenp@3602 1091 // for this allocation.
coleenp@3602 1092 delta_words = MAX2(delta_words, max_delta_words);
coleenp@3602 1093 if (delta_words > max_delta_words) {
coleenp@3602 1094 // This allocation is large but the next ones are probably not
coleenp@3602 1095 // so increase by the minimum.
coleenp@3602 1096 delta_words = delta_words + min_delta_words;
coleenp@3602 1097 }
coleenp@3602 1098 }
coleenp@3602 1099 return delta_words;
coleenp@3602 1100 }
coleenp@3602 1101
coleenp@3602 1102 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
coleenp@3602 1103
coleenp@3602 1104 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1105 // metadata virtual space.
coleenp@3602 1106 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1107
coleenp@3602 1108 // If the user wants a limit, impose one.
coleenp@3602 1109 size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord;
coleenp@3602 1110 size_t metaspace_size_words = MetaspaceSize / BytesPerWord;
coleenp@3602 1111 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
coleenp@3602 1112 vsl->capacity_words_sum() >= max_metaspace_size_words) {
coleenp@3602 1113 return false;
coleenp@3602 1114 }
coleenp@3602 1115
coleenp@3602 1116 // If this is part of an allocation after a GC, expand
coleenp@3602 1117 // unconditionally.
coleenp@3602 1118 if(MetaspaceGC::expand_after_GC()) {
coleenp@3602 1119 return true;
coleenp@3602 1120 }
coleenp@3602 1121
coleenp@3602 1122 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1123 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1124 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1125 // until that minimum capacity is exceeded.
coleenp@3602 1126 if (vsl->capacity_words_sum() < metaspace_size_words ||
coleenp@3602 1127 capacity_until_GC() == 0) {
coleenp@3602 1128 set_capacity_until_GC(metaspace_size_words);
coleenp@3602 1129 return true;
coleenp@3602 1130 } else {
coleenp@3602 1131 if (vsl->capacity_words_sum() < capacity_until_GC()) {
coleenp@3602 1132 return true;
coleenp@3602 1133 } else {
coleenp@3602 1134 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1135 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1136 " capacity_until_GC " SIZE_FORMAT
coleenp@3602 1137 " capacity_words_sum " SIZE_FORMAT
coleenp@3602 1138 " used_words_sum " SIZE_FORMAT
coleenp@3602 1139 " free chunks " SIZE_FORMAT
coleenp@3602 1140 " free chunks count %d",
coleenp@3602 1141 word_size,
coleenp@3602 1142 capacity_until_GC(),
coleenp@3602 1143 vsl->capacity_words_sum(),
coleenp@3602 1144 vsl->used_words_sum(),
coleenp@3602 1145 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1146 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1147 }
coleenp@3602 1148 return false;
coleenp@3602 1149 }
coleenp@3602 1150 }
coleenp@3602 1151 }
coleenp@3602 1152
coleenp@3602 1153 // Variables are in bytes
coleenp@3602 1154
coleenp@3602 1155 void MetaspaceGC::compute_new_size() {
coleenp@3602 1156 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1157 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1158 _shrink_factor = 0;
coleenp@3602 1159
coleenp@3602 1160 VirtualSpaceList *vsl = Metaspace::space_list();
coleenp@3602 1161
coleenp@3602 1162 size_t capacity_after_gc = vsl->capacity_bytes_sum();
coleenp@3602 1163 // Check to see if these two can be calculated without walking the CLDG
coleenp@3602 1164 size_t used_after_gc = vsl->used_bytes_sum();
coleenp@3602 1165 size_t capacity_until_GC = vsl->capacity_bytes_sum();
coleenp@3602 1166 size_t free_after_gc = capacity_until_GC - used_after_gc;
coleenp@3602 1167
jmasa@4146 1168 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1169 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1170
coleenp@3602 1171 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1172 size_t minimum_desired_capacity =
coleenp@3602 1173 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1174 // Don't shrink less than the initial generation size
coleenp@3602 1175 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1176 MetaspaceSize);
coleenp@3602 1177
coleenp@3602 1178 if (PrintGCDetails && Verbose) {
coleenp@3602 1179 const double free_percentage = ((double)free_after_gc) / capacity_until_GC;
coleenp@3602 1180 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1181 gclog_or_tty->print_cr(" "
coleenp@3602 1182 " minimum_free_percentage: %6.2f"
coleenp@3602 1183 " maximum_used_percentage: %6.2f",
coleenp@3602 1184 minimum_free_percentage,
coleenp@3602 1185 maximum_used_percentage);
coleenp@3602 1186 double d_free_after_gc = free_after_gc / (double) K;
coleenp@3602 1187 gclog_or_tty->print_cr(" "
coleenp@3602 1188 " free_after_gc : %6.1fK"
coleenp@3602 1189 " used_after_gc : %6.1fK"
coleenp@3602 1190 " capacity_after_gc : %6.1fK"
coleenp@3602 1191 " metaspace HWM : %6.1fK",
coleenp@3602 1192 free_after_gc / (double) K,
coleenp@3602 1193 used_after_gc / (double) K,
coleenp@3602 1194 capacity_after_gc / (double) K,
coleenp@3602 1195 capacity_until_GC / (double) K);
coleenp@3602 1196 gclog_or_tty->print_cr(" "
coleenp@3602 1197 " free_percentage: %6.2f",
coleenp@3602 1198 free_percentage);
coleenp@3602 1199 }
coleenp@3602 1200
coleenp@3602 1201
coleenp@3602 1202 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1203 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1204 // increment the HWM.
coleenp@3602 1205 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1206 // Don't expand unless it's significant
coleenp@3602 1207 if (expand_bytes >= MinMetaspaceExpansion) {
coleenp@3602 1208 size_t expand_words = expand_bytes / BytesPerWord;
coleenp@3602 1209 MetaspaceGC::inc_capacity_until_GC(expand_words);
coleenp@3602 1210 }
coleenp@3602 1211 if (PrintGCDetails && Verbose) {
coleenp@3602 1212 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1213 gclog_or_tty->print_cr(" expanding:"
coleenp@3602 1214 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1215 " expand_words: %6.1fK"
coleenp@3602 1216 " MinMetaspaceExpansion: %6.1fK"
coleenp@3602 1217 " new metaspace HWM: %6.1fK",
coleenp@3602 1218 minimum_desired_capacity / (double) K,
coleenp@3602 1219 expand_bytes / (double) K,
coleenp@3602 1220 MinMetaspaceExpansion / (double) K,
coleenp@3602 1221 new_capacity_until_GC / (double) K);
coleenp@3602 1222 }
coleenp@3602 1223 return;
coleenp@3602 1224 }
coleenp@3602 1225
coleenp@3602 1226 // No expansion, now see if we want to shrink
coleenp@3602 1227 size_t shrink_words = 0;
coleenp@3602 1228 // We would never want to shrink more than this
coleenp@3602 1229 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity;
coleenp@3602 1230 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT,
coleenp@3602 1231 max_shrink_words));
coleenp@3602 1232
coleenp@3602 1233 // Should shrinking be considered?
jmasa@4146 1234 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1235 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1236 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1237 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1238 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1239 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1240 MetaspaceSize);
coleenp@3602 1241 if (PrintGC && Verbose) {
coleenp@3602 1242 gclog_or_tty->print_cr(" "
coleenp@3602 1243 " maximum_free_percentage: %6.2f"
coleenp@3602 1244 " minimum_used_percentage: %6.2f",
coleenp@3602 1245 maximum_free_percentage,
coleenp@3602 1246 minimum_used_percentage);
coleenp@3602 1247 gclog_or_tty->print_cr(" "
coleenp@3602 1248 " capacity_until_GC: %6.1fK"
coleenp@3602 1249 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1250 " maximum_desired_capacity: %6.1fK",
coleenp@3602 1251 capacity_until_GC / (double) K,
coleenp@3602 1252 minimum_desired_capacity / (double) K,
coleenp@3602 1253 maximum_desired_capacity / (double) K);
coleenp@3602 1254 }
coleenp@3602 1255
coleenp@3602 1256 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1257 "sanity check");
coleenp@3602 1258
coleenp@3602 1259 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1260 // Capacity too large, compute shrinking size
coleenp@3602 1261 shrink_words = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1262 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1263 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1264 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1265 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1266 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1267 // size without shrinking, it goes back to 0%.
coleenp@3602 1268 shrink_words = shrink_words / 100 * current_shrink_factor;
coleenp@3602 1269 assert(shrink_words <= max_shrink_words,
coleenp@3602 1270 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
coleenp@3602 1271 shrink_words, max_shrink_words));
coleenp@3602 1272 if (current_shrink_factor == 0) {
coleenp@3602 1273 _shrink_factor = 10;
coleenp@3602 1274 } else {
coleenp@3602 1275 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1276 }
coleenp@3602 1277 if (PrintGCDetails && Verbose) {
coleenp@3602 1278 gclog_or_tty->print_cr(" "
coleenp@3602 1279 " shrinking:"
coleenp@3602 1280 " initSize: %.1fK"
coleenp@3602 1281 " maximum_desired_capacity: %.1fK",
coleenp@3602 1282 MetaspaceSize / (double) K,
coleenp@3602 1283 maximum_desired_capacity / (double) K);
coleenp@3602 1284 gclog_or_tty->print_cr(" "
coleenp@3602 1285 " shrink_words: %.1fK"
coleenp@3602 1286 " current_shrink_factor: %d"
coleenp@3602 1287 " new shrink factor: %d"
coleenp@3602 1288 " MinMetaspaceExpansion: %.1fK",
coleenp@3602 1289 shrink_words / (double) K,
coleenp@3602 1290 current_shrink_factor,
coleenp@3602 1291 _shrink_factor,
coleenp@3602 1292 MinMetaspaceExpansion / (double) K);
coleenp@3602 1293 }
coleenp@3602 1294 }
coleenp@3602 1295 }
coleenp@3602 1296
coleenp@3602 1297
coleenp@3602 1298 // Don't shrink unless it's significant
coleenp@3602 1299 if (shrink_words >= MinMetaspaceExpansion) {
coleenp@3602 1300 VirtualSpaceNode* csp = vsl->current_virtual_space();
coleenp@3602 1301 size_t available_to_shrink = csp->capacity_words_in_vs() -
coleenp@3602 1302 csp->used_words_in_vs();
coleenp@3602 1303 shrink_words = MIN2(shrink_words, available_to_shrink);
coleenp@3602 1304 csp->shrink_by(shrink_words);
coleenp@3602 1305 MetaspaceGC::dec_capacity_until_GC(shrink_words);
coleenp@3602 1306 if (PrintGCDetails && Verbose) {
coleenp@3602 1307 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1308 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K);
coleenp@3602 1309 }
coleenp@3602 1310 }
mgerdin@4349 1311 assert(used_after_gc <= vsl->capacity_bytes_sum(),
coleenp@3602 1312 "sanity check");
coleenp@3602 1313
coleenp@3602 1314 }
coleenp@3602 1315
coleenp@3602 1316 // Metadebug methods
coleenp@3602 1317
coleenp@3602 1318 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1319 size_t chunk_word_size){
coleenp@3602 1320 #ifdef ASSERT
coleenp@3602 1321 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1322 if (MetaDataDeallocateALot &&
coleenp@3602 1323 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1324 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1325 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1326 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1327 if (dummy_chunk == NULL) {
coleenp@3602 1328 break;
coleenp@3602 1329 }
coleenp@3602 1330 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1331
coleenp@3602 1332 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1333 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1334 sm->sum_count_in_chunks_in_use());
coleenp@3602 1335 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1336 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1337 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1338 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1339 }
coleenp@3602 1340 }
coleenp@3602 1341 } else {
coleenp@3602 1342 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1343 }
coleenp@3602 1344 #endif
coleenp@3602 1345 }
coleenp@3602 1346
coleenp@3602 1347 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1348 size_t raw_word_size){
coleenp@3602 1349 #ifdef ASSERT
coleenp@3602 1350 if (MetaDataDeallocateALot &&
coleenp@3602 1351 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1352 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1353 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1354 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1355 if (dummy_block == 0) {
coleenp@3602 1356 break;
coleenp@3602 1357 }
jmasa@3761 1358 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1359 }
coleenp@3602 1360 } else {
coleenp@3602 1361 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1362 }
coleenp@3602 1363 #endif
coleenp@3602 1364 }
coleenp@3602 1365
coleenp@3602 1366 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1367 if (MetadataAllocationFailALot) {
coleenp@3602 1368 _allocation_fail_alot_count =
coleenp@3602 1369 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1370 }
coleenp@3602 1371 }
coleenp@3602 1372
coleenp@3602 1373 #ifdef ASSERT
coleenp@3602 1374 bool Metadebug::test_metadata_failure() {
coleenp@3602 1375 if (MetadataAllocationFailALot &&
coleenp@3602 1376 Threads::is_vm_complete()) {
coleenp@3602 1377 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1378 _allocation_fail_alot_count--;
coleenp@3602 1379 } else {
coleenp@3602 1380 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1381 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1382 "MetadataAllocationFailALot");
coleenp@3602 1383 }
coleenp@3602 1384 init_allocation_fail_alot_count();
coleenp@3602 1385 return true;
coleenp@3602 1386 }
coleenp@3602 1387 }
coleenp@3602 1388 return false;
coleenp@3602 1389 }
coleenp@3602 1390 #endif
coleenp@3602 1391
coleenp@3602 1392 // ChunkList methods
coleenp@3602 1393
coleenp@3602 1394 size_t ChunkList::sum_list_size() {
coleenp@3602 1395 size_t result = 0;
coleenp@3602 1396 Metachunk* cur = head();
coleenp@3602 1397 while (cur != NULL) {
coleenp@3602 1398 result += cur->word_size();
coleenp@3602 1399 cur = cur->next();
coleenp@3602 1400 }
coleenp@3602 1401 return result;
coleenp@3602 1402 }
coleenp@3602 1403
coleenp@3602 1404 size_t ChunkList::sum_list_count() {
coleenp@3602 1405 size_t result = 0;
coleenp@3602 1406 Metachunk* cur = head();
coleenp@3602 1407 while (cur != NULL) {
coleenp@3602 1408 result++;
coleenp@3602 1409 cur = cur->next();
coleenp@3602 1410 }
coleenp@3602 1411 return result;
coleenp@3602 1412 }
coleenp@3602 1413
coleenp@3602 1414 size_t ChunkList::sum_list_capacity() {
coleenp@3602 1415 size_t result = 0;
coleenp@3602 1416 Metachunk* cur = head();
coleenp@3602 1417 while (cur != NULL) {
coleenp@3602 1418 result += cur->capacity_word_size();
coleenp@3602 1419 cur = cur->next();
coleenp@3602 1420 }
coleenp@3602 1421 return result;
coleenp@3602 1422 }
coleenp@3602 1423
coleenp@3602 1424 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) {
coleenp@3602 1425 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1426 assert(head == tail || tail->next() == NULL,
jmasa@3947 1427 "Not the tail or the head has already been added to a list");
coleenp@3602 1428
coleenp@3602 1429 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1430 gclog_or_tty->print("ChunkList::add_at_head(head, tail): ");
coleenp@3602 1431 Metachunk* cur = head;
coleenp@3602 1432 while (cur != NULL) {
jmasa@3947 1433 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size());
coleenp@3602 1434 cur = cur->next();
coleenp@3602 1435 }
jmasa@3947 1436 gclog_or_tty->print_cr("");
coleenp@3602 1437 }
coleenp@3602 1438
coleenp@3602 1439 if (tail != NULL) {
coleenp@3602 1440 tail->set_next(_head);
coleenp@3602 1441 }
coleenp@3602 1442 set_head(head);
coleenp@3602 1443 }
coleenp@3602 1444
coleenp@3602 1445 void ChunkList::add_at_head(Metachunk* list) {
coleenp@3602 1446 if (list == NULL) {
coleenp@3602 1447 // Nothing to add
coleenp@3602 1448 return;
coleenp@3602 1449 }
coleenp@3602 1450 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1451 Metachunk* head = list;
coleenp@3602 1452 Metachunk* tail = list;
coleenp@3602 1453 Metachunk* cur = head->next();
coleenp@3602 1454 // Search for the tail since it is not passed.
coleenp@3602 1455 while (cur != NULL) {
coleenp@3602 1456 tail = cur;
coleenp@3602 1457 cur = cur->next();
coleenp@3602 1458 }
coleenp@3602 1459 add_at_head(head, tail);
coleenp@3602 1460 }
coleenp@3602 1461
coleenp@3602 1462 // ChunkManager methods
coleenp@3602 1463
coleenp@3602 1464 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1465 // work with the CMS collector because its use of additional locks
coleenp@3602 1466 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1467 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1468
coleenp@3602 1469 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1470 #ifdef ASSERT
coleenp@3602 1471 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1472 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1473 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1474 slow_locked_verify_free_chunks_total();
coleenp@3602 1475 }
coleenp@3602 1476 #endif
coleenp@3602 1477 return _free_chunks_total;
coleenp@3602 1478 }
coleenp@3602 1479
coleenp@3602 1480 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1481 return free_chunks_total() * BytesPerWord;
coleenp@3602 1482 }
coleenp@3602 1483
coleenp@3602 1484 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1485 #ifdef ASSERT
coleenp@3602 1486 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1487 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1488 Mutex::_no_safepoint_check_flag);
coleenp@3602 1489 // This lock is only needed in debug because the verification
coleenp@3602 1490 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1491 slow_locked_verify_free_chunks_count();
coleenp@3602 1492 }
coleenp@3602 1493 #endif
mgerdin@3829 1494 return _free_chunks_count;
coleenp@3602 1495 }
coleenp@3602 1496
coleenp@3602 1497 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1498 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1499 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1500 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1501 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1502 sum_free_chunks()));
coleenp@3602 1503 }
coleenp@3602 1504
coleenp@3602 1505 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1506 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1507 Mutex::_no_safepoint_check_flag);
coleenp@3602 1508 locked_verify_free_chunks_total();
coleenp@3602 1509 }
coleenp@3602 1510
coleenp@3602 1511 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1512 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1513 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1514 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1515 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1516 sum_free_chunks_count()));
coleenp@3602 1517 }
coleenp@3602 1518
coleenp@3602 1519 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1520 #ifdef ASSERT
coleenp@3602 1521 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1522 Mutex::_no_safepoint_check_flag);
coleenp@3602 1523 locked_verify_free_chunks_count();
coleenp@3602 1524 #endif
coleenp@3602 1525 }
coleenp@3602 1526
coleenp@3602 1527 void ChunkManager::verify() {
mgerdin@3829 1528 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1529 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1530 locked_verify();
coleenp@3602 1531 }
coleenp@3602 1532
coleenp@3602 1533 void ChunkManager::locked_verify() {
jmasa@3761 1534 locked_verify_free_chunks_count();
coleenp@3602 1535 locked_verify_free_chunks_total();
coleenp@3602 1536 }
coleenp@3602 1537
coleenp@3602 1538 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1539 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1540 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1541 _free_chunks_total, _free_chunks_count);
coleenp@3602 1542 }
coleenp@3602 1543
coleenp@3602 1544 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1545 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1546 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1547 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1548 }
coleenp@3602 1549 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1550 return &_free_chunks[index];
coleenp@3602 1551 }
coleenp@3602 1552
coleenp@3602 1553 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1554 // methods that are used in product builds.
coleenp@3602 1555 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1556 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1557 size_t result = 0;
jmasa@3947 1558 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1559 ChunkList* list = free_chunks(i);
coleenp@3602 1560
coleenp@3602 1561 if (list == NULL) {
coleenp@3602 1562 continue;
coleenp@3602 1563 }
coleenp@3602 1564
coleenp@3602 1565 result = result + list->sum_list_capacity();
coleenp@3602 1566 }
jmasa@3761 1567 result = result + humongous_dictionary()->total_size();
coleenp@3602 1568 return result;
coleenp@3602 1569 }
coleenp@3602 1570
coleenp@3602 1571 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1572 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1573 size_t count = 0;
jmasa@3947 1574 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1575 ChunkList* list = free_chunks(i);
coleenp@3602 1576 if (list == NULL) {
coleenp@3602 1577 continue;
coleenp@3602 1578 }
coleenp@3602 1579 count = count + list->sum_list_count();
coleenp@3602 1580 }
jmasa@3761 1581 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1582 return count;
coleenp@3602 1583 }
coleenp@3602 1584
coleenp@3602 1585 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1586 ChunkIndex index = list_index(word_size);
jmasa@3947 1587 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1588 return free_chunks(index);
coleenp@3602 1589 }
coleenp@3602 1590
coleenp@3602 1591 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1592 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1593 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1594 chunk->set_next(free_list->head());
coleenp@3602 1595 free_list->set_head(chunk);
coleenp@3602 1596 // chunk is being returned to the chunk free list
coleenp@3602 1597 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1598 slow_locked_verify();
coleenp@3602 1599 }
coleenp@3602 1600
coleenp@3602 1601 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1602 // The deallocation of a chunk originates in the freelist
coleenp@3602 1603 // manangement code for a Metaspace and does not hold the
coleenp@3602 1604 // lock.
coleenp@3602 1605 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1606 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1607 slow_locked_verify();
coleenp@3602 1608 if (TraceMetadataChunkAllocation) {
coleenp@3602 1609 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1610 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1611 chunk, chunk->word_size());
coleenp@3602 1612 }
coleenp@3602 1613 free_chunks_put(chunk);
coleenp@3602 1614 }
coleenp@3602 1615
coleenp@3602 1616 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1617 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1618
mgerdin@3829 1619 slow_locked_verify();
jmasa@3761 1620
jmasa@3761 1621 Metachunk* chunk = NULL;
jmasa@3947 1622 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1623 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1624 assert(free_list != NULL, "Sanity check");
jmasa@3761 1625
jmasa@3761 1626 chunk = free_list->head();
jmasa@3761 1627 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1628
jmasa@3761 1629 if (chunk == NULL) {
jmasa@3761 1630 return NULL;
jmasa@3761 1631 }
jmasa@3761 1632
coleenp@3602 1633 // Remove the chunk as the head of the list.
coleenp@3602 1634 free_list->set_head(chunk->next());
jmasa@3947 1635
jmasa@3947 1636 // Chunk is being removed from the chunks free list.
jmasa@3761 1637 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1638
coleenp@3602 1639 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1640 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1641 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1642 free_list, chunk, chunk->word_size());
coleenp@3602 1643 }
coleenp@3602 1644 } else {
jmasa@3761 1645 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1646 word_size,
jmasa@3761 1647 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1648
jmasa@3761 1649 if (chunk != NULL) {
jmasa@3761 1650 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1651 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1652 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1653 " for requested size " SIZE_FORMAT
jmasa@3761 1654 " waste " SIZE_FORMAT,
jmasa@3761 1655 chunk->word_size(), word_size, waste);
coleenp@3602 1656 }
jmasa@3761 1657 // Chunk is being removed from the chunks free list.
jmasa@3761 1658 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3761 1659 #ifdef ASSERT
jmasa@3761 1660 chunk->set_is_free(false);
jmasa@3761 1661 #endif
jmasa@3947 1662 } else {
jmasa@3947 1663 return NULL;
coleenp@3602 1664 }
coleenp@3602 1665 }
jmasa@3947 1666
jmasa@3947 1667 // Remove it from the links to this freelist
jmasa@3947 1668 chunk->set_next(NULL);
jmasa@3947 1669 chunk->set_prev(NULL);
mgerdin@3829 1670 slow_locked_verify();
coleenp@3602 1671 return chunk;
coleenp@3602 1672 }
coleenp@3602 1673
coleenp@3602 1674 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1675 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1676 slow_locked_verify();
coleenp@3602 1677
coleenp@3602 1678 // Take from the beginning of the list
coleenp@3602 1679 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1680 if (chunk == NULL) {
coleenp@3602 1681 return NULL;
coleenp@3602 1682 }
coleenp@3602 1683
jmasa@3947 1684 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1685 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1686 "Non-humongous variable sized chunk");
coleenp@3602 1687 if (TraceMetadataChunkAllocation) {
jmasa@3947 1688 size_t list_count;
jmasa@3947 1689 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1690 ChunkList* list = find_free_chunks_list(word_size);
jmasa@3947 1691 list_count = list->sum_list_count();
jmasa@3947 1692 } else {
jmasa@3947 1693 list_count = humongous_dictionary()->total_count();
jmasa@3947 1694 }
jmasa@3947 1695 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1696 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1697 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1698 locked_print_free_chunks(tty);
coleenp@3602 1699 }
coleenp@3602 1700
coleenp@3602 1701 return chunk;
coleenp@3602 1702 }
coleenp@3602 1703
jmasa@3761 1704 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1705 if (PrintFLSStatistics != 0) {
jmasa@3761 1706 humongous_dictionary()->report_statistics();
jmasa@3761 1707 }
jmasa@3761 1708 }
jmasa@3761 1709
coleenp@3602 1710 // SpaceManager methods
coleenp@3602 1711
jmasa@3947 1712 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1713 size_t* chunk_word_size,
jmasa@3947 1714 size_t* class_chunk_word_size) {
jmasa@3947 1715 switch (type) {
jmasa@3947 1716 case Metaspace::BootMetaspaceType:
jmasa@3947 1717 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1718 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1719 break;
jmasa@3947 1720 case Metaspace::ROMetaspaceType:
jmasa@3947 1721 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1722 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1723 break;
jmasa@3947 1724 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1725 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1726 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1727 break;
jmasa@3947 1728 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1729 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1730 *chunk_word_size = SpecializedChunk;
jmasa@3947 1731 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1732 break;
jmasa@3947 1733 default:
jmasa@3947 1734 *chunk_word_size = SmallChunk;
jmasa@3947 1735 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1736 break;
jmasa@3947 1737 }
mikael@4113 1738 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1739 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1740 " class " SIZE_FORMAT,
mikael@4113 1741 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1742 }
jmasa@3947 1743
coleenp@3602 1744 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1745 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1746 size_t free = 0;
jmasa@3947 1747 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1748 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1749 while (chunk != NULL) {
coleenp@3602 1750 free += chunk->free_word_size();
coleenp@3602 1751 chunk = chunk->next();
coleenp@3602 1752 }
coleenp@3602 1753 }
coleenp@3602 1754 return free;
coleenp@3602 1755 }
coleenp@3602 1756
coleenp@3602 1757 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1758 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1759 size_t result = 0;
jmasa@3947 1760 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1761 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1762 }
jmasa@3761 1763
coleenp@3602 1764 return result;
coleenp@3602 1765 }
coleenp@3602 1766
coleenp@3602 1767 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1768 size_t result = 0;
coleenp@3602 1769 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1770 // Count the free space in all the chunk but not the
coleenp@3602 1771 // current chunk from which allocations are still being done.
coleenp@3602 1772 if (chunk != NULL) {
jmasa@3761 1773 Metachunk* prev = chunk;
jmasa@3761 1774 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1775 result += chunk->free_word_size();
jmasa@3761 1776 prev = chunk;
coleenp@3602 1777 chunk = chunk->next();
coleenp@3602 1778 }
coleenp@3602 1779 }
coleenp@3602 1780 return result;
coleenp@3602 1781 }
coleenp@3602 1782
coleenp@3602 1783 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
coleenp@3602 1784 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1785 size_t sum = 0;
jmasa@3947 1786 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1787 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1788 while (chunk != NULL) {
coleenp@3602 1789 // Just changed this sum += chunk->capacity_word_size();
coleenp@3602 1790 // sum += chunk->word_size() - Metachunk::overhead();
coleenp@3602 1791 sum += chunk->capacity_word_size();
coleenp@3602 1792 chunk = chunk->next();
coleenp@3602 1793 }
coleenp@3602 1794 }
coleenp@3602 1795 return sum;
coleenp@3602 1796 }
coleenp@3602 1797
coleenp@3602 1798 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1799 size_t count = 0;
jmasa@3947 1800 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1801 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1802 }
jmasa@3761 1803
coleenp@3602 1804 return count;
coleenp@3602 1805 }
coleenp@3602 1806
coleenp@3602 1807 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1808 size_t count = 0;
coleenp@3602 1809 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1810 while (chunk != NULL) {
coleenp@3602 1811 count++;
coleenp@3602 1812 chunk = chunk->next();
coleenp@3602 1813 }
coleenp@3602 1814 return count;
coleenp@3602 1815 }
coleenp@3602 1816
coleenp@3602 1817
coleenp@3602 1818 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1819 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1820 size_t used = 0;
jmasa@3947 1821 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1822 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1823 while (chunk != NULL) {
coleenp@3602 1824 used += chunk->used_word_size();
coleenp@3602 1825 chunk = chunk->next();
coleenp@3602 1826 }
coleenp@3602 1827 }
coleenp@3602 1828 return used;
coleenp@3602 1829 }
coleenp@3602 1830
coleenp@3602 1831 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1832
jmasa@3947 1833 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1834 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1835 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1836 chunk_size_name(i), chunk);
jmasa@3947 1837 if (chunk != NULL) {
jmasa@3947 1838 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1839 chunk->free_word_size());
jmasa@3947 1840 } else {
jmasa@3947 1841 st->print_cr("");
jmasa@3947 1842 }
jmasa@3947 1843 }
coleenp@3602 1844
coleenp@3602 1845 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1846 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1847 }
coleenp@3602 1848
coleenp@3602 1849 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1850
coleenp@3602 1851 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1852 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1853 // once a medium chunk has been allocated, no more small
coleenp@3602 1854 // chunks will be allocated.
coleenp@3602 1855 size_t chunk_word_size;
coleenp@3602 1856 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1857 (!has_small_chunk_limit() ||
coleenp@3602 1858 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
jmasa@3947 1859 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1860 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1861 chunk_word_size = medium_chunk_size();
coleenp@3602 1862 }
coleenp@3602 1863 } else {
jmasa@3947 1864 chunk_word_size = medium_chunk_size();
coleenp@3602 1865 }
coleenp@3602 1866
jmasa@3947 1867 // Might still need a humongous chunk. Enforce an
jmasa@3947 1868 // eight word granularity to facilitate reuse (some
jmasa@3947 1869 // wastage but better chance of reuse).
jmasa@3947 1870 size_t if_humongous_sized_chunk =
jmasa@3947 1871 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1872 HumongousChunkGranularity);
coleenp@3602 1873 chunk_word_size =
jmasa@3947 1874 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1875
jmasa@3947 1876 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1877 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1878 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1879 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1880 word_size, chunk_word_size));
coleenp@3602 1881 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1882 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1883 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1884 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1885 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1886 chunk_word_size);
jmasa@3761 1887 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1888 Metachunk::overhead());
coleenp@3602 1889 }
coleenp@3602 1890 return chunk_word_size;
coleenp@3602 1891 }
coleenp@3602 1892
jmasa@3761 1893 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1894 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1895 "Should have been set");
coleenp@3602 1896 assert(current_chunk() == NULL ||
coleenp@3602 1897 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1898 "Don't need to expand");
coleenp@3602 1899 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1900
coleenp@3602 1901 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1902 size_t words_left = 0;
jmasa@3947 1903 size_t words_used = 0;
jmasa@3947 1904 if (current_chunk() != NULL) {
jmasa@3947 1905 words_left = current_chunk()->free_word_size();
jmasa@3947 1906 words_used = current_chunk()->used_word_size();
jmasa@3947 1907 }
coleenp@3602 1908 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 1909 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 1910 " words left",
jmasa@3947 1911 word_size, words_used, words_left);
coleenp@3602 1912 }
coleenp@3602 1913
coleenp@3602 1914 // Get another chunk out of the virtual space
coleenp@3602 1915 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 1916 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 1917
coleenp@3602 1918 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 1919 // and do an allocation from it.
coleenp@3602 1920 if (next != NULL) {
coleenp@3602 1921 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 1922 // Add to this manager's list of chunks in use.
coleenp@3602 1923 add_chunk(next, false);
coleenp@3602 1924 return next->allocate(word_size);
coleenp@3602 1925 }
coleenp@3602 1926 return NULL;
coleenp@3602 1927 }
coleenp@3602 1928
coleenp@3602 1929 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 1930
jmasa@3947 1931 for (ChunkIndex i = ZeroIndex;
jmasa@3761 1932 i < NumberOfInUseLists ;
coleenp@3602 1933 i = next_chunk_index(i) ) {
coleenp@3602 1934 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 1935 chunks_in_use(i),
coleenp@3602 1936 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 1937 }
coleenp@3602 1938 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 1939 " Humongous " SIZE_FORMAT,
coleenp@3602 1940 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 1941 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 1942 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 1943 // block free lists
jmasa@3761 1944 if (block_freelists() != NULL) {
jmasa@3761 1945 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 1946 block_freelists()->total_size());
jmasa@3761 1947 }
coleenp@3602 1948 }
coleenp@3602 1949
jmasa@3947 1950 SpaceManager::SpaceManager(Mutex* lock,
jmasa@3947 1951 VirtualSpaceList* vs_list) :
coleenp@3602 1952 _vs_list(vs_list),
coleenp@3602 1953 _allocation_total(0),
jmasa@3947 1954 _lock(lock)
jmasa@3947 1955 {
jmasa@3947 1956 initialize();
jmasa@3947 1957 }
jmasa@3947 1958
jmasa@3947 1959 void SpaceManager::initialize() {
coleenp@3602 1960 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 1961 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1962 _chunks_in_use[i] = NULL;
coleenp@3602 1963 }
coleenp@3602 1964 _current_chunk = NULL;
coleenp@3602 1965 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1966 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1967 }
coleenp@3602 1968 }
coleenp@3602 1969
coleenp@3602 1970 SpaceManager::~SpaceManager() {
mgerdin@4349 1971 // This call this->_lock which can't be done while holding expand_lock()
mgerdin@4349 1972 const size_t in_use_before = sum_capacity_in_chunks_in_use();
mgerdin@4349 1973
coleenp@3602 1974 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 1975 Mutex::_no_safepoint_check_flag);
coleenp@3602 1976
coleenp@3602 1977 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 1978
mgerdin@3829 1979 chunk_manager->slow_locked_verify();
coleenp@3602 1980
coleenp@3602 1981 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1982 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1983 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 1984 }
coleenp@3602 1985
coleenp@3869 1986 // Mangle freed memory.
coleenp@3869 1987 NOT_PRODUCT(mangle_freed_chunks();)
coleenp@3869 1988
coleenp@3602 1989 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 1990 // below.
mgerdin@4349 1991 chunk_manager->inc_free_chunks_total(in_use_before,
coleenp@3602 1992 sum_count_in_chunks_in_use());
coleenp@3602 1993
coleenp@3602 1994 // Add all the chunks in use by this space manager
coleenp@3602 1995 // to the global list of free chunks.
coleenp@3602 1996
jmasa@3947 1997 // Follow each list of chunks-in-use and add them to the
jmasa@3947 1998 // free lists. Each list is NULL terminated.
jmasa@3947 1999
jmasa@3947 2000 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 2001 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2002 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 2003 sum_count_in_chunks_in_use(i),
jmasa@3947 2004 chunk_size_name(i));
jmasa@3947 2005 }
jmasa@3947 2006 Metachunk* chunks = chunks_in_use(i);
jmasa@3947 2007 chunk_manager->free_chunks(i)->add_at_head(chunks);
jmasa@3947 2008 set_chunks_in_use(i, NULL);
jmasa@3947 2009 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2010 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@3947 2011 chunk_manager->free_chunks(i)->sum_list_count(),
jmasa@3947 2012 chunk_size_name(i));
jmasa@3947 2013 }
jmasa@3947 2014 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 2015 }
coleenp@3602 2016
jmasa@3947 2017 // The medium chunk case may be optimized by passing the head and
jmasa@3947 2018 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 2019 // the current chunk but there are probably exceptions.
jmasa@3947 2020
coleenp@3602 2021 // Humongous chunks
jmasa@3947 2022 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2023 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 2024 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 2025 chunk_size_name(HumongousIndex));
jmasa@3947 2026 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 2027 }
coleenp@3602 2028 // Humongous chunks are never the current chunk.
coleenp@3602 2029 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2030
jmasa@3761 2031 while (humongous_chunks != NULL) {
jmasa@3761 2032 #ifdef ASSERT
jmasa@3761 2033 humongous_chunks->set_is_free(true);
jmasa@3761 2034 #endif
jmasa@3947 2035 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2036 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 2037 humongous_chunks,
jmasa@3947 2038 humongous_chunks->word_size());
jmasa@3947 2039 }
jmasa@3947 2040 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 2041 align_size_up(humongous_chunks->word_size(),
jmasa@3947 2042 HumongousChunkGranularity),
jmasa@3947 2043 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 2044 " granularity %d",
jmasa@3947 2045 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 2046 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@3761 2047 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2048 humongous_chunks = next_humongous_chunks;
coleenp@3602 2049 }
jmasa@3947 2050 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2051 gclog_or_tty->print_cr("");
jmasa@3947 2052 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 2053 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 2054 chunk_size_name(HumongousIndex));
jmasa@3947 2055 }
jmasa@3761 2056 set_chunks_in_use(HumongousIndex, NULL);
mgerdin@3829 2057 chunk_manager->slow_locked_verify();
coleenp@3602 2058 }
coleenp@3602 2059
jmasa@3947 2060 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 2061 switch (index) {
jmasa@3947 2062 case SpecializedIndex:
jmasa@3947 2063 return "Specialized";
jmasa@3947 2064 case SmallIndex:
jmasa@3947 2065 return "Small";
jmasa@3947 2066 case MediumIndex:
jmasa@3947 2067 return "Medium";
jmasa@3947 2068 case HumongousIndex:
jmasa@3947 2069 return "Humongous";
jmasa@3947 2070 default:
jmasa@3947 2071 return NULL;
jmasa@3947 2072 }
jmasa@3947 2073 }
jmasa@3947 2074
jmasa@3947 2075 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2076 switch (size) {
jmasa@3947 2077 case SpecializedChunk:
jmasa@3947 2078 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2079 "Need branch for ClassSpecializedChunk");
jmasa@3947 2080 return SpecializedIndex;
jmasa@3947 2081 case SmallChunk:
jmasa@3947 2082 case ClassSmallChunk:
jmasa@3947 2083 return SmallIndex;
jmasa@3947 2084 case MediumChunk:
jmasa@3947 2085 case ClassMediumChunk:
jmasa@3947 2086 return MediumIndex;
jmasa@3947 2087 default:
jmasa@3948 2088 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2089 "Not a humongous chunk");
jmasa@3947 2090 return HumongousIndex;
jmasa@3947 2091 }
jmasa@3947 2092 }
jmasa@3947 2093
jmasa@3761 2094 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2095 assert_lock_strong(_lock);
jmasa@3761 2096 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2097 assert(word_size >= min_size,
jmasa@3761 2098 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2099 block_freelists()->return_block(p, word_size);
coleenp@3602 2100 }
coleenp@3602 2101
coleenp@3602 2102 // Adds a chunk to the list of chunks in use.
coleenp@3602 2103 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2104
coleenp@3602 2105 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2106 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2107
coleenp@3602 2108 new_chunk->reset_empty();
coleenp@3602 2109
coleenp@3602 2110 // Find the correct list and and set the current
coleenp@3602 2111 // chunk for that list.
jmasa@3947 2112 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2113
jmasa@3947 2114 if (index != HumongousIndex) {
coleenp@3602 2115 set_current_chunk(new_chunk);
jmasa@3947 2116 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2117 set_chunks_in_use(index, new_chunk);
jmasa@3947 2118 } else {
coleenp@3602 2119 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2120 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2121 // chunk.
coleenp@3602 2122 if (make_current) {
coleenp@3602 2123 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2124 set_current_chunk(new_chunk);
coleenp@3602 2125 }
coleenp@3602 2126 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2127 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2128 // any humongous chunks so will not point to the tail
coleenp@3602 2129 // of the humongous chunks list.
coleenp@3602 2130 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2131 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2132
jmasa@3948 2133 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2134 }
coleenp@3602 2135
coleenp@3602 2136 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2137 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2138 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2139 sum_count_in_chunks_in_use());
coleenp@3602 2140 new_chunk->print_on(gclog_or_tty);
coleenp@3602 2141 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
coleenp@3602 2142 }
coleenp@3602 2143 }
coleenp@3602 2144
jmasa@3947 2145 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2146 size_t grow_chunks_by_words) {
jmasa@3947 2147
jmasa@3947 2148 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2149 grow_chunks_by_words,
jmasa@3947 2150 medium_chunk_bunch());
jmasa@3947 2151
jmasa@3947 2152 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2153 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2154 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2155 next->word_size());
jmasa@3947 2156 }
jmasa@3947 2157
jmasa@3947 2158 return next;
jmasa@3947 2159 }
jmasa@3947 2160
coleenp@3602 2161 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2162 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2163
coleenp@3602 2164 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2165 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2166 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2167 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2168
jmasa@3761 2169 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2170
jmasa@3761 2171 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2172 Metablock::min_block_byte_size());
jmasa@3761 2173 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2174 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2175 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2176
coleenp@3602 2177 BlockFreelist* fl = block_freelists();
jmasa@3761 2178 MetaWord* p = NULL;
coleenp@3602 2179 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2180 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2181 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2182 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2183 // for allocations. Do some profiling. JJJ
jmasa@3761 2184 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2185 p = fl->get_block(raw_word_size);
coleenp@3602 2186 }
jmasa@3761 2187 if (p == NULL) {
jmasa@3761 2188 p = allocate_work(raw_word_size);
coleenp@3602 2189 }
coleenp@3602 2190 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2191
jmasa@3761 2192 return p;
coleenp@3602 2193 }
coleenp@3602 2194
coleenp@3602 2195 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2196 // This methods does not know about blocks (Metablocks)
jmasa@3761 2197 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2198 assert_lock_strong(_lock);
coleenp@3602 2199 #ifdef ASSERT
coleenp@3602 2200 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2201 return NULL;
coleenp@3602 2202 }
coleenp@3602 2203 #endif
coleenp@3602 2204 // Is there space in the current chunk?
jmasa@3761 2205 MetaWord* result = NULL;
coleenp@3602 2206
coleenp@3602 2207 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2208 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2209 // of memory if this returns null.
coleenp@3602 2210 if (DumpSharedSpaces) {
coleenp@3602 2211 assert(current_chunk() != NULL, "should never happen");
coleenp@3602 2212 inc_allocation_total(word_size);
coleenp@3602 2213 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2214 }
coleenp@3602 2215 if (current_chunk() != NULL) {
coleenp@3602 2216 result = current_chunk()->allocate(word_size);
coleenp@3602 2217 }
coleenp@3602 2218
coleenp@3602 2219 if (result == NULL) {
coleenp@3602 2220 result = grow_and_allocate(word_size);
coleenp@3602 2221 }
coleenp@3602 2222 if (result > 0) {
coleenp@3602 2223 inc_allocation_total(word_size);
jmasa@3761 2224 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2225 "Head of the list is being allocated");
coleenp@3602 2226 }
coleenp@3602 2227
coleenp@3602 2228 return result;
coleenp@3602 2229 }
coleenp@3602 2230
coleenp@3602 2231 void SpaceManager::verify() {
coleenp@3602 2232 // If there are blocks in the dictionary, then
coleenp@3602 2233 // verfication of chunks does not work since
coleenp@3602 2234 // being in the dictionary alters a chunk.
jmasa@3761 2235 if (block_freelists()->total_size() == 0) {
jmasa@3947 2236 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2237 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2238 while (curr != NULL) {
coleenp@3602 2239 curr->verify();
jmasa@3892 2240 verify_chunk_size(curr);
coleenp@3602 2241 curr = curr->next();
coleenp@3602 2242 }
coleenp@3602 2243 }
coleenp@3602 2244 }
coleenp@3602 2245 }
coleenp@3602 2246
jmasa@3892 2247 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2248 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2249 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2250 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2251 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2252 "Chunk size is wrong");
jmasa@3892 2253 return;
jmasa@3892 2254 }
jmasa@3892 2255
coleenp@3602 2256 #ifdef ASSERT
coleenp@3602 2257 void SpaceManager::verify_allocation_total() {
coleenp@3602 2258 // Verification is only guaranteed at a safepoint.
coleenp@3602 2259 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2260 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT
coleenp@3602 2261 " sum_used_in_chunks_in_use " SIZE_FORMAT,
coleenp@3602 2262 this,
coleenp@3602 2263 allocation_total(),
coleenp@3602 2264 sum_used_in_chunks_in_use());
coleenp@3602 2265 }
coleenp@3602 2266 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2267 assert(allocation_total() == sum_used_in_chunks_in_use(),
mikael@4113 2268 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2269 " vs " SIZE_FORMAT,
coleenp@3602 2270 allocation_total(), sum_used_in_chunks_in_use()));
coleenp@3602 2271 }
coleenp@3602 2272
coleenp@3602 2273 #endif
coleenp@3602 2274
coleenp@3602 2275 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2276 size_t curr_total = 0;
coleenp@3602 2277 size_t waste = 0;
coleenp@3602 2278 uint i = 0;
coleenp@3602 2279 size_t used = 0;
coleenp@3602 2280 size_t capacity = 0;
coleenp@3602 2281
coleenp@3602 2282 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2283 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2284 index < NumberOfInUseLists;
coleenp@3602 2285 index = next_chunk_index(index)) {
coleenp@3602 2286 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2287 curr != NULL;
coleenp@3602 2288 curr = curr->next()) {
coleenp@3602 2289 out->print("%d) ", i++);
coleenp@3602 2290 curr->print_on(out);
coleenp@3602 2291 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2292 block_freelists()->print_on(out);
coleenp@3602 2293 }
coleenp@3602 2294 curr_total += curr->word_size();
coleenp@3602 2295 used += curr->used_word_size();
coleenp@3602 2296 capacity += curr->capacity_word_size();
coleenp@3602 2297 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2298 }
coleenp@3602 2299 }
coleenp@3602 2300
jmasa@3947 2301 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2302 // Free space isn't wasted.
coleenp@3602 2303 waste -= free;
coleenp@3602 2304
coleenp@3602 2305 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2306 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2307 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2308 }
coleenp@3602 2309
coleenp@3869 2310 #ifndef PRODUCT
coleenp@3602 2311 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2312 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2313 index < NumberOfInUseLists;
coleenp@3602 2314 index = next_chunk_index(index)) {
coleenp@3602 2315 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2316 curr != NULL;
coleenp@3602 2317 curr = curr->next()) {
coleenp@3602 2318 curr->mangle();
coleenp@3602 2319 }
coleenp@3602 2320 }
coleenp@3602 2321 }
coleenp@3869 2322 #endif // PRODUCT
coleenp@3602 2323
coleenp@3602 2324 // MetaspaceAux
coleenp@3602 2325
jmasa@3611 2326 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) {
jmasa@3607 2327 size_t used = 0;
jmasa@3607 2328 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2329 while (iter.repeat()) {
jmasa@3607 2330 Metaspace* msp = iter.get_next();
jmasa@3607 2331 // Sum allocation_total for each metaspace
jmasa@3607 2332 if (msp != NULL) {
jmasa@3607 2333 used += msp->used_words(mdtype);
jmasa@3607 2334 }
jmasa@3607 2335 }
jmasa@3607 2336 return used * BytesPerWord;
jmasa@3607 2337 }
jmasa@3607 2338
coleenp@3602 2339 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2340 size_t free = 0;
coleenp@3602 2341 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2342 while (iter.repeat()) {
coleenp@3602 2343 Metaspace* msp = iter.get_next();
coleenp@3602 2344 if (msp != NULL) {
coleenp@3602 2345 free += msp->free_words(mdtype);
coleenp@3602 2346 }
coleenp@3602 2347 }
coleenp@3602 2348 return free * BytesPerWord;
coleenp@3602 2349 }
coleenp@3602 2350
coleenp@3602 2351 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2352 size_t capacity = free_chunks_total(mdtype);
coleenp@3602 2353 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2354 while (iter.repeat()) {
coleenp@3602 2355 Metaspace* msp = iter.get_next();
coleenp@3602 2356 if (msp != NULL) {
coleenp@3602 2357 capacity += msp->capacity_words(mdtype);
coleenp@3602 2358 }
coleenp@3602 2359 }
coleenp@3602 2360 return capacity * BytesPerWord;
coleenp@3602 2361 }
coleenp@3602 2362
coleenp@3602 2363 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2364 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2365 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2366 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2367 return reserved * BytesPerWord;
coleenp@3602 2368 }
coleenp@3602 2369
jmasa@3947 2370 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
coleenp@3602 2371
coleenp@3602 2372 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2373 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2374 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2375 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2376 chunk->slow_verify();
coleenp@3602 2377 return chunk->free_chunks_total();
coleenp@3602 2378 }
coleenp@3602 2379
coleenp@3602 2380 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2381 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2382 }
coleenp@3602 2383
coleenp@3602 2384 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2385 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2386 if (PrintGCDetails && Verbose) {
coleenp@3602 2387 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2388 "->" SIZE_FORMAT
coleenp@3602 2389 "(" SIZE_FORMAT "/" SIZE_FORMAT ")",
coleenp@3602 2390 prev_metadata_used,
coleenp@3602 2391 used_in_bytes(),
coleenp@3602 2392 capacity_in_bytes(),
coleenp@3602 2393 reserved_in_bytes());
coleenp@3602 2394 } else {
coleenp@3602 2395 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2396 "->" SIZE_FORMAT "K"
coleenp@3602 2397 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)",
coleenp@3602 2398 prev_metadata_used / K,
coleenp@3602 2399 used_in_bytes()/ K,
coleenp@3602 2400 capacity_in_bytes()/K,
coleenp@3602 2401 reserved_in_bytes()/ K);
coleenp@3602 2402 }
coleenp@3602 2403
coleenp@3602 2404 gclog_or_tty->print("]");
coleenp@3602 2405 }
coleenp@3602 2406
coleenp@3602 2407 // This is printed when PrintGCDetails
coleenp@3602 2408 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2409 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2410 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2411
coleenp@3602 2412 out->print_cr(" Metaspace total "
coleenp@3602 2413 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2414 " reserved " SIZE_FORMAT "K",
jmasa@3611 2415 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K);
coleenp@3602 2416 out->print_cr(" data space "
coleenp@3602 2417 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2418 " reserved " SIZE_FORMAT "K",
jmasa@3611 2419 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K);
coleenp@3602 2420 out->print_cr(" class space "
coleenp@3602 2421 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2422 " reserved " SIZE_FORMAT "K",
jmasa@3611 2423 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K);
coleenp@3602 2424 }
coleenp@3602 2425
coleenp@3602 2426 // Print information for class space and data space separately.
coleenp@3602 2427 // This is almost the same as above.
coleenp@3602 2428 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2429 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
coleenp@3602 2430 size_t capacity_bytes = capacity_in_bytes(mdtype);
coleenp@3602 2431 size_t used_bytes = used_in_bytes(mdtype);
coleenp@3602 2432 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2433 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2434 free_chunks_capacity_bytes;
coleenp@3602 2435 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2436 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2437 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2438 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2439 used_bytes / K,
coleenp@3602 2440 free_bytes / K,
coleenp@3602 2441 free_chunks_capacity_bytes / K,
coleenp@3602 2442 used_and_free / K,
coleenp@3602 2443 capacity_bytes / K);
mgerdin@4303 2444 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2445 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2446 }
coleenp@3602 2447
coleenp@3602 2448 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2449 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2450
jmasa@3947 2451 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0;
jmasa@3947 2452 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0;
jmasa@3947 2453 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
jmasa@3947 2454 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0;
coleenp@3602 2455
coleenp@3602 2456 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2457 while (iter.repeat()) {
coleenp@3602 2458 Metaspace* msp = iter.get_next();
coleenp@3602 2459 if (msp != NULL) {
jmasa@3947 2460 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2461 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2462 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2463 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2464 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2465 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2466 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2467 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
jmasa@3947 2468
jmasa@3947 2469 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2470 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2471 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2472 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2473 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2474 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2475 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2476 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2477 }
coleenp@3602 2478 }
coleenp@3602 2479 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2480 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2481 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
jmasa@3947 2482 SIZE_FORMAT " medium(s) " SIZE_FORMAT,
jmasa@3947 2483 specialized_count, specialized_waste, small_count,
jmasa@3947 2484 small_waste, medium_count, medium_waste);
jmasa@3947 2485 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2486 SIZE_FORMAT " small(s) " SIZE_FORMAT,
jmasa@3947 2487 cls_specialized_count, cls_specialized_waste,
jmasa@3947 2488 cls_small_count, cls_small_waste);
coleenp@3602 2489 }
coleenp@3602 2490
coleenp@3602 2491 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2492 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2493 out->print_cr("All Metaspace:");
coleenp@3602 2494 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2495 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2496 print_waste(out);
coleenp@3602 2497 }
coleenp@3602 2498
mgerdin@3829 2499 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2500 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2501 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2502 }
mgerdin@3829 2503
coleenp@3602 2504 // Metaspace methods
coleenp@3602 2505
coleenp@3602 2506 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2507 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2508
jmasa@3947 2509 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2510 initialize(lock, type);
coleenp@3602 2511 }
coleenp@3602 2512
coleenp@3602 2513 Metaspace::~Metaspace() {
coleenp@3602 2514 delete _vsm;
coleenp@3602 2515 delete _class_vsm;
coleenp@3602 2516 }
coleenp@3602 2517
coleenp@3602 2518 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2519 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2520
coleenp@3602 2521 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2522
coleenp@3602 2523 void Metaspace::global_initialize() {
coleenp@3602 2524 // Initialize the alignment for shared spaces.
coleenp@3602 2525 int max_alignment = os::vm_page_size();
coleenp@3602 2526 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2527
coleenp@3602 2528 if (DumpSharedSpaces) {
coleenp@3602 2529 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2530 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2531 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2532 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2533
coleenp@3602 2534 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2535 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2536 // remainder is the misc code and data chunks.
coleenp@3602 2537 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2538 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2539 os::vm_allocation_granularity());
coleenp@3602 2540 size_t word_size = total/wordSize;
coleenp@3602 2541 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2542 } else {
coleenp@3602 2543 // If using shared space, open the file that contains the shared space
coleenp@3602 2544 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2545 // the addresses don't conflict)
coleenp@3602 2546 if (UseSharedSpaces) {
coleenp@3602 2547 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2548 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2549
coleenp@3602 2550 // Open the shared archive file, read and validate the header. If
coleenp@3602 2551 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2552 // disabled and the file is closed.
coleenp@3602 2553 // Map in spaces now also
coleenp@3602 2554 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2555 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2556 } else {
coleenp@3602 2557 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2558 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2559 }
coleenp@3602 2560 }
coleenp@3602 2561
jmasa@3947 2562 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 2563 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 2564 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 2565 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 2566 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 2567 // from there. This size calculated by -version.
jmasa@3947 2568 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
jmasa@3947 2569 (ClassMetaspaceSize/BytesPerWord)*2);
jmasa@3947 2570 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 2571 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2572 // of the boot class loader size.
jmasa@3947 2573 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 2574 // Initialize the list of virtual spaces.
coleenp@3602 2575 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2576 }
coleenp@3602 2577 }
coleenp@3602 2578
coleenp@3602 2579 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2580 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2581 // argument passed in is at the top of the compressed space
coleenp@3602 2582 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2583 // The reserved space size may be bigger because of alignment, esp with UseLargePages
mikael@4113 2584 assert(rs.size() >= ClassMetaspaceSize,
mikael@4113 2585 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize));
coleenp@3602 2586 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2587 }
coleenp@3602 2588
jmasa@3947 2589 void Metaspace::initialize(Mutex* lock,
jmasa@3947 2590 MetaspaceType type) {
coleenp@3602 2591
coleenp@3602 2592 assert(space_list() != NULL,
coleenp@3602 2593 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2594
coleenp@3602 2595 _vsm = new SpaceManager(lock, space_list());
coleenp@3602 2596 if (_vsm == NULL) {
coleenp@3602 2597 return;
coleenp@3602 2598 }
jmasa@3947 2599 size_t word_size;
jmasa@3947 2600 size_t class_word_size;
jmasa@3947 2601 vsm()->get_initial_chunk_sizes(type,
jmasa@3947 2602 &word_size,
jmasa@3947 2603 &class_word_size);
coleenp@3602 2604
coleenp@3602 2605 assert(class_space_list() != NULL,
coleenp@3602 2606 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2607
coleenp@3602 2608 // Allocate SpaceManager for classes.
coleenp@3602 2609 _class_vsm = new SpaceManager(lock, class_space_list());
coleenp@3602 2610 if (_class_vsm == NULL) {
coleenp@3602 2611 return;
coleenp@3602 2612 }
coleenp@3602 2613
coleenp@3602 2614 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2615
coleenp@3602 2616 // Allocate chunk for metadata objects
coleenp@3602 2617 Metachunk* new_chunk =
jmasa@3947 2618 space_list()->get_initialization_chunk(word_size,
jmasa@3947 2619 vsm()->medium_chunk_bunch());
coleenp@3602 2620 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2621 if (new_chunk != NULL) {
coleenp@3602 2622 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2623 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2624 }
coleenp@3602 2625
coleenp@3602 2626 // Allocate chunk for class metadata objects
coleenp@3602 2627 Metachunk* class_chunk =
jmasa@3947 2628 class_space_list()->get_initialization_chunk(class_word_size,
jmasa@3947 2629 class_vsm()->medium_chunk_bunch());
coleenp@3602 2630 if (class_chunk != NULL) {
coleenp@3602 2631 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2632 }
coleenp@3602 2633 }
coleenp@3602 2634
jmasa@3947 2635 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 2636 size_t byte_size = word_size * wordSize;
jmasa@3947 2637 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@3947 2638 }
jmasa@3947 2639
coleenp@3602 2640 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2641 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2642 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2643 return class_vsm()->allocate(word_size);
coleenp@3602 2644 } else {
jmasa@3761 2645 return vsm()->allocate(word_size);
coleenp@3602 2646 }
coleenp@3602 2647 }
coleenp@3602 2648
jmasa@3629 2649 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2650 MetaWord* result;
jmasa@3629 2651 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2652 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@3629 2653 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size);
jmasa@3629 2654 MetaspaceGC::inc_capacity_until_GC(delta_words);
jmasa@3629 2655 if (PrintGCDetails && Verbose) {
jmasa@3629 2656 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2657 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2658 }
jmasa@3761 2659
jmasa@3629 2660 result = allocate(word_size, mdtype);
jmasa@3629 2661
jmasa@3629 2662 return result;
jmasa@3629 2663 }
jmasa@3629 2664
coleenp@3602 2665 // Space allocated in the Metaspace. This may
coleenp@3602 2666 // be across several metadata virtual spaces.
coleenp@3602 2667 char* Metaspace::bottom() const {
coleenp@3602 2668 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2669 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2670 }
coleenp@3602 2671
coleenp@3602 2672 size_t Metaspace::used_words(MetadataType mdtype) const {
coleenp@3602 2673 // return vsm()->allocation_total();
coleenp@3602 2674 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2675 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2676 }
coleenp@3602 2677
coleenp@3602 2678 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2679 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2680 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2681 }
coleenp@3602 2682
coleenp@3602 2683 // Space capacity in the Metaspace. It includes
coleenp@3602 2684 // space in the list of chunks from which allocations
coleenp@3602 2685 // have been made. Don't include space in the global freelist and
coleenp@3602 2686 // in the space available in the dictionary which
coleenp@3602 2687 // is already counted in some chunk.
coleenp@3602 2688 size_t Metaspace::capacity_words(MetadataType mdtype) const {
coleenp@3602 2689 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2690 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2691 }
coleenp@3602 2692
coleenp@3602 2693 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2694 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2695 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2696 // Don't take Heap_lock
jmasa@3761 2697 MutexLocker ml(vsm()->lock());
jmasa@3761 2698 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2699 // Dark matter. Too small for dictionary.
jmasa@3761 2700 #ifdef ASSERT
jmasa@3761 2701 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2702 #endif
jmasa@3761 2703 return;
jmasa@3761 2704 }
coleenp@3602 2705 if (is_class) {
jmasa@3761 2706 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2707 } else {
jmasa@3761 2708 vsm()->deallocate(ptr, word_size);
coleenp@3602 2709 }
coleenp@3602 2710 } else {
coleenp@3602 2711 MutexLocker ml(vsm()->lock());
coleenp@3602 2712
jmasa@3761 2713 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2714 // Dark matter. Too small for dictionary.
jmasa@3761 2715 #ifdef ASSERT
jmasa@3761 2716 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2717 #endif
jmasa@3761 2718 return;
jmasa@3761 2719 }
coleenp@3602 2720 if (is_class) {
jmasa@3761 2721 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2722 } else {
jmasa@3761 2723 vsm()->deallocate(ptr, word_size);
coleenp@3602 2724 }
coleenp@3602 2725 }
coleenp@3602 2726 }
coleenp@3602 2727
jmasa@3761 2728 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 2729 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 2730 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 2731 assert(false, "Should not allocate with exception pending");
coleenp@3602 2732 return NULL; // caller does a CHECK_NULL too
coleenp@3602 2733 }
coleenp@3602 2734
coleenp@3602 2735 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 2736 MetaWord* result = NULL;
coleenp@3602 2737
coleenp@3602 2738 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 2739 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 2740 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 2741 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 2742 // to revisit this for application class data sharing.
coleenp@3602 2743 if (DumpSharedSpaces) {
coleenp@3602 2744 if (read_only) {
coleenp@3602 2745 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2746 } else {
coleenp@3602 2747 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2748 }
coleenp@3602 2749 if (result == NULL) {
coleenp@3602 2750 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 2751 }
jmasa@3761 2752 return Metablock::initialize(result, word_size);
coleenp@3602 2753 }
coleenp@3602 2754
coleenp@3602 2755 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 2756
coleenp@3602 2757 if (result == NULL) {
coleenp@3602 2758 // Try to clean out some memory and retry.
coleenp@3602 2759 result =
jmasa@3761 2760 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 2761 loader_data, word_size, mdtype);
coleenp@3602 2762
coleenp@3602 2763 // If result is still null, we are out of memory.
coleenp@3602 2764 if (result == NULL) {
jmasa@3947 2765 if (Verbose && TraceMetadataChunkAllocation) {
jmasa@3947 2766 gclog_or_tty->print_cr("Metaspace allocation failed for size "
jmasa@3947 2767 SIZE_FORMAT, word_size);
jmasa@3947 2768 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty);
jmasa@3947 2769 MetaspaceAux::dump(gclog_or_tty);
jmasa@3947 2770 }
coleenp@3602 2771 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 2772 report_java_out_of_memory("Metadata space");
coleenp@3602 2773
coleenp@3602 2774 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 2775 JvmtiExport::post_resource_exhausted(
coleenp@3602 2776 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 2777 "Metadata space");
coleenp@3602 2778 }
coleenp@3602 2779 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 2780 }
coleenp@3602 2781 }
jmasa@3761 2782 return Metablock::initialize(result, word_size);
coleenp@3602 2783 }
coleenp@3602 2784
coleenp@3602 2785 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 2786 // Print both class virtual space counts and metaspace.
coleenp@3602 2787 if (Verbose) {
coleenp@3602 2788 vsm()->print_on(out);
coleenp@3602 2789 class_vsm()->print_on(out);
coleenp@3602 2790 }
coleenp@3602 2791 }
coleenp@3602 2792
coleenp@3860 2793 bool Metaspace::contains(const void * ptr) {
coleenp@3602 2794 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 2795 return true;
coleenp@3602 2796 }
coleenp@3860 2797 // This is checked while unlocked. As long as the virtualspaces are added
coleenp@3860 2798 // at the end, the pointer will be in one of them. The virtual spaces
coleenp@3860 2799 // aren't deleted presently. When they are, some sort of locking might
coleenp@3860 2800 // be needed. Note, locking this can cause inversion problems with the
coleenp@3860 2801 // caller in MetaspaceObj::is_metadata() function.
coleenp@3602 2802 return space_list()->contains(ptr) || class_space_list()->contains(ptr);
coleenp@3602 2803 }
coleenp@3602 2804
coleenp@3602 2805 void Metaspace::verify() {
coleenp@3602 2806 vsm()->verify();
coleenp@3602 2807 class_vsm()->verify();
coleenp@3602 2808 }
coleenp@3602 2809
coleenp@3602 2810 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 2811 if (UseMallocOnly) {
coleenp@3602 2812 // Just print usage for now
coleenp@3602 2813 out->print_cr("usage %d", used_words(Metaspace::NonClassType));
coleenp@3602 2814 }
coleenp@3602 2815 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 2816 vsm()->dump(out);
coleenp@3602 2817 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 2818 class_vsm()->dump(out);
coleenp@3602 2819 }