annotate src/share/vm/memory/metaspace.cpp @ 4355:7f0cb32dd233

8004241: NPG: Metaspace occupies more memory than specified by -XX:MaxMetaspaceSize option Summary: Enforce MaxMetaspaceSize for both metaspace parts, check MaxMetaspaceSize against "reserved", not "capacity" Reviewed-by: jmasa, johnc
author mgerdin
date Thu, 21 Mar 2013 09:07:43 +0100
parents 19f9fabd94cc
children 47902e9acb3a
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) {
mgerdin@4355 1103 // If the user wants a limit, impose one.
mgerdin@4355 1104 if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
mgerdin@4355 1105 MetaspaceAux::reserved_in_bytes() >= MaxMetaspaceSize) {
mgerdin@4355 1106 return false;
mgerdin@4355 1107 }
coleenp@3602 1108
coleenp@3602 1109 // Class virtual space should always be expanded. Call GC for the other
coleenp@3602 1110 // metadata virtual space.
coleenp@3602 1111 if (vsl == Metaspace::class_space_list()) return true;
coleenp@3602 1112
coleenp@3602 1113 // If this is part of an allocation after a GC, expand
coleenp@3602 1114 // unconditionally.
coleenp@3602 1115 if(MetaspaceGC::expand_after_GC()) {
coleenp@3602 1116 return true;
coleenp@3602 1117 }
coleenp@3602 1118
mgerdin@4355 1119 size_t metaspace_size_words = MetaspaceSize / BytesPerWord;
mgerdin@4355 1120
coleenp@3602 1121 // If the capacity is below the minimum capacity, allow the
coleenp@3602 1122 // expansion. Also set the high-water-mark (capacity_until_GC)
coleenp@3602 1123 // to that minimum capacity so that a GC will not be induced
coleenp@3602 1124 // until that minimum capacity is exceeded.
coleenp@3602 1125 if (vsl->capacity_words_sum() < metaspace_size_words ||
coleenp@3602 1126 capacity_until_GC() == 0) {
coleenp@3602 1127 set_capacity_until_GC(metaspace_size_words);
coleenp@3602 1128 return true;
coleenp@3602 1129 } else {
coleenp@3602 1130 if (vsl->capacity_words_sum() < capacity_until_GC()) {
coleenp@3602 1131 return true;
coleenp@3602 1132 } else {
coleenp@3602 1133 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1134 gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT
coleenp@3602 1135 " capacity_until_GC " SIZE_FORMAT
coleenp@3602 1136 " capacity_words_sum " SIZE_FORMAT
coleenp@3602 1137 " used_words_sum " SIZE_FORMAT
coleenp@3602 1138 " free chunks " SIZE_FORMAT
coleenp@3602 1139 " free chunks count %d",
coleenp@3602 1140 word_size,
coleenp@3602 1141 capacity_until_GC(),
coleenp@3602 1142 vsl->capacity_words_sum(),
coleenp@3602 1143 vsl->used_words_sum(),
coleenp@3602 1144 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1145 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1146 }
coleenp@3602 1147 return false;
coleenp@3602 1148 }
coleenp@3602 1149 }
coleenp@3602 1150 }
coleenp@3602 1151
coleenp@3602 1152 // Variables are in bytes
coleenp@3602 1153
coleenp@3602 1154 void MetaspaceGC::compute_new_size() {
coleenp@3602 1155 assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@3602 1156 uint current_shrink_factor = _shrink_factor;
coleenp@3602 1157 _shrink_factor = 0;
coleenp@3602 1158
coleenp@3602 1159 VirtualSpaceList *vsl = Metaspace::space_list();
coleenp@3602 1160
coleenp@3602 1161 size_t capacity_after_gc = vsl->capacity_bytes_sum();
coleenp@3602 1162 // Check to see if these two can be calculated without walking the CLDG
coleenp@3602 1163 size_t used_after_gc = vsl->used_bytes_sum();
coleenp@3602 1164 size_t capacity_until_GC = vsl->capacity_bytes_sum();
coleenp@3602 1165 size_t free_after_gc = capacity_until_GC - used_after_gc;
coleenp@3602 1166
jmasa@4146 1167 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@3602 1168 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@3602 1169
coleenp@3602 1170 const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@3602 1171 size_t minimum_desired_capacity =
coleenp@3602 1172 (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@3602 1173 // Don't shrink less than the initial generation size
coleenp@3602 1174 minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@3602 1175 MetaspaceSize);
coleenp@3602 1176
coleenp@3602 1177 if (PrintGCDetails && Verbose) {
coleenp@3602 1178 const double free_percentage = ((double)free_after_gc) / capacity_until_GC;
coleenp@3602 1179 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@3602 1180 gclog_or_tty->print_cr(" "
coleenp@3602 1181 " minimum_free_percentage: %6.2f"
coleenp@3602 1182 " maximum_used_percentage: %6.2f",
coleenp@3602 1183 minimum_free_percentage,
coleenp@3602 1184 maximum_used_percentage);
coleenp@3602 1185 double d_free_after_gc = free_after_gc / (double) K;
coleenp@3602 1186 gclog_or_tty->print_cr(" "
coleenp@3602 1187 " free_after_gc : %6.1fK"
coleenp@3602 1188 " used_after_gc : %6.1fK"
coleenp@3602 1189 " capacity_after_gc : %6.1fK"
coleenp@3602 1190 " metaspace HWM : %6.1fK",
coleenp@3602 1191 free_after_gc / (double) K,
coleenp@3602 1192 used_after_gc / (double) K,
coleenp@3602 1193 capacity_after_gc / (double) K,
coleenp@3602 1194 capacity_until_GC / (double) K);
coleenp@3602 1195 gclog_or_tty->print_cr(" "
coleenp@3602 1196 " free_percentage: %6.2f",
coleenp@3602 1197 free_percentage);
coleenp@3602 1198 }
coleenp@3602 1199
coleenp@3602 1200
coleenp@3602 1201 if (capacity_until_GC < minimum_desired_capacity) {
coleenp@3602 1202 // If we have less capacity below the metaspace HWM, then
coleenp@3602 1203 // increment the HWM.
coleenp@3602 1204 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
coleenp@3602 1205 // Don't expand unless it's significant
coleenp@3602 1206 if (expand_bytes >= MinMetaspaceExpansion) {
coleenp@3602 1207 size_t expand_words = expand_bytes / BytesPerWord;
coleenp@3602 1208 MetaspaceGC::inc_capacity_until_GC(expand_words);
coleenp@3602 1209 }
coleenp@3602 1210 if (PrintGCDetails && Verbose) {
coleenp@3602 1211 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1212 gclog_or_tty->print_cr(" expanding:"
coleenp@3602 1213 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1214 " expand_words: %6.1fK"
coleenp@3602 1215 " MinMetaspaceExpansion: %6.1fK"
coleenp@3602 1216 " new metaspace HWM: %6.1fK",
coleenp@3602 1217 minimum_desired_capacity / (double) K,
coleenp@3602 1218 expand_bytes / (double) K,
coleenp@3602 1219 MinMetaspaceExpansion / (double) K,
coleenp@3602 1220 new_capacity_until_GC / (double) K);
coleenp@3602 1221 }
coleenp@3602 1222 return;
coleenp@3602 1223 }
coleenp@3602 1224
coleenp@3602 1225 // No expansion, now see if we want to shrink
coleenp@3602 1226 size_t shrink_words = 0;
coleenp@3602 1227 // We would never want to shrink more than this
coleenp@3602 1228 size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity;
coleenp@3602 1229 assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT,
coleenp@3602 1230 max_shrink_words));
coleenp@3602 1231
coleenp@3602 1232 // Should shrinking be considered?
jmasa@4146 1233 if (MaxMetaspaceFreeRatio < 100) {
jmasa@4146 1234 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@3602 1235 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@3602 1236 const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@3602 1237 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@3602 1238 maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@3602 1239 MetaspaceSize);
coleenp@3602 1240 if (PrintGC && Verbose) {
coleenp@3602 1241 gclog_or_tty->print_cr(" "
coleenp@3602 1242 " maximum_free_percentage: %6.2f"
coleenp@3602 1243 " minimum_used_percentage: %6.2f",
coleenp@3602 1244 maximum_free_percentage,
coleenp@3602 1245 minimum_used_percentage);
coleenp@3602 1246 gclog_or_tty->print_cr(" "
coleenp@3602 1247 " capacity_until_GC: %6.1fK"
coleenp@3602 1248 " minimum_desired_capacity: %6.1fK"
coleenp@3602 1249 " maximum_desired_capacity: %6.1fK",
coleenp@3602 1250 capacity_until_GC / (double) K,
coleenp@3602 1251 minimum_desired_capacity / (double) K,
coleenp@3602 1252 maximum_desired_capacity / (double) K);
coleenp@3602 1253 }
coleenp@3602 1254
coleenp@3602 1255 assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@3602 1256 "sanity check");
coleenp@3602 1257
coleenp@3602 1258 if (capacity_until_GC > maximum_desired_capacity) {
coleenp@3602 1259 // Capacity too large, compute shrinking size
coleenp@3602 1260 shrink_words = capacity_until_GC - maximum_desired_capacity;
coleenp@3602 1261 // We don't want shrink all the way back to initSize if people call
coleenp@3602 1262 // System.gc(), because some programs do that between "phases" and then
coleenp@3602 1263 // we'd just have to grow the heap up again for the next phase. So we
coleenp@3602 1264 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@3602 1265 // on the third call, and 100% by the fourth call. But if we recompute
coleenp@3602 1266 // size without shrinking, it goes back to 0%.
coleenp@3602 1267 shrink_words = shrink_words / 100 * current_shrink_factor;
coleenp@3602 1268 assert(shrink_words <= max_shrink_words,
coleenp@3602 1269 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
coleenp@3602 1270 shrink_words, max_shrink_words));
coleenp@3602 1271 if (current_shrink_factor == 0) {
coleenp@3602 1272 _shrink_factor = 10;
coleenp@3602 1273 } else {
coleenp@3602 1274 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@3602 1275 }
coleenp@3602 1276 if (PrintGCDetails && Verbose) {
coleenp@3602 1277 gclog_or_tty->print_cr(" "
coleenp@3602 1278 " shrinking:"
coleenp@3602 1279 " initSize: %.1fK"
coleenp@3602 1280 " maximum_desired_capacity: %.1fK",
coleenp@3602 1281 MetaspaceSize / (double) K,
coleenp@3602 1282 maximum_desired_capacity / (double) K);
coleenp@3602 1283 gclog_or_tty->print_cr(" "
coleenp@3602 1284 " shrink_words: %.1fK"
coleenp@3602 1285 " current_shrink_factor: %d"
coleenp@3602 1286 " new shrink factor: %d"
coleenp@3602 1287 " MinMetaspaceExpansion: %.1fK",
coleenp@3602 1288 shrink_words / (double) K,
coleenp@3602 1289 current_shrink_factor,
coleenp@3602 1290 _shrink_factor,
coleenp@3602 1291 MinMetaspaceExpansion / (double) K);
coleenp@3602 1292 }
coleenp@3602 1293 }
coleenp@3602 1294 }
coleenp@3602 1295
coleenp@3602 1296
coleenp@3602 1297 // Don't shrink unless it's significant
coleenp@3602 1298 if (shrink_words >= MinMetaspaceExpansion) {
coleenp@3602 1299 VirtualSpaceNode* csp = vsl->current_virtual_space();
coleenp@3602 1300 size_t available_to_shrink = csp->capacity_words_in_vs() -
coleenp@3602 1301 csp->used_words_in_vs();
coleenp@3602 1302 shrink_words = MIN2(shrink_words, available_to_shrink);
coleenp@3602 1303 csp->shrink_by(shrink_words);
coleenp@3602 1304 MetaspaceGC::dec_capacity_until_GC(shrink_words);
coleenp@3602 1305 if (PrintGCDetails && Verbose) {
coleenp@3602 1306 size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
coleenp@3602 1307 gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K);
coleenp@3602 1308 }
coleenp@3602 1309 }
mgerdin@4349 1310 assert(used_after_gc <= vsl->capacity_bytes_sum(),
coleenp@3602 1311 "sanity check");
coleenp@3602 1312
coleenp@3602 1313 }
coleenp@3602 1314
coleenp@3602 1315 // Metadebug methods
coleenp@3602 1316
coleenp@3602 1317 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
coleenp@3602 1318 size_t chunk_word_size){
coleenp@3602 1319 #ifdef ASSERT
coleenp@3602 1320 VirtualSpaceList* vsl = sm->vs_list();
coleenp@3602 1321 if (MetaDataDeallocateALot &&
coleenp@3602 1322 Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1323 Metadebug::reset_deallocate_chunk_a_lot_count();
coleenp@3602 1324 for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
coleenp@3602 1325 Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
coleenp@3602 1326 if (dummy_chunk == NULL) {
coleenp@3602 1327 break;
coleenp@3602 1328 }
coleenp@3602 1329 vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
coleenp@3602 1330
coleenp@3602 1331 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1332 gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
coleenp@3602 1333 sm->sum_count_in_chunks_in_use());
coleenp@3602 1334 dummy_chunk->print_on(gclog_or_tty);
coleenp@3602 1335 gclog_or_tty->print_cr(" Free chunks total %d count %d",
coleenp@3602 1336 vsl->chunk_manager()->free_chunks_total(),
coleenp@3602 1337 vsl->chunk_manager()->free_chunks_count());
coleenp@3602 1338 }
coleenp@3602 1339 }
coleenp@3602 1340 } else {
coleenp@3602 1341 Metadebug::inc_deallocate_chunk_a_lot_count();
coleenp@3602 1342 }
coleenp@3602 1343 #endif
coleenp@3602 1344 }
coleenp@3602 1345
coleenp@3602 1346 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
coleenp@3602 1347 size_t raw_word_size){
coleenp@3602 1348 #ifdef ASSERT
coleenp@3602 1349 if (MetaDataDeallocateALot &&
coleenp@3602 1350 Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
coleenp@3602 1351 Metadebug::set_deallocate_block_a_lot_count(0);
coleenp@3602 1352 for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
jmasa@3761 1353 MetaWord* dummy_block = sm->allocate_work(raw_word_size);
coleenp@3602 1354 if (dummy_block == 0) {
coleenp@3602 1355 break;
coleenp@3602 1356 }
jmasa@3761 1357 sm->deallocate(dummy_block, raw_word_size);
coleenp@3602 1358 }
coleenp@3602 1359 } else {
coleenp@3602 1360 Metadebug::inc_deallocate_block_a_lot_count();
coleenp@3602 1361 }
coleenp@3602 1362 #endif
coleenp@3602 1363 }
coleenp@3602 1364
coleenp@3602 1365 void Metadebug::init_allocation_fail_alot_count() {
coleenp@3602 1366 if (MetadataAllocationFailALot) {
coleenp@3602 1367 _allocation_fail_alot_count =
coleenp@3602 1368 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@3602 1369 }
coleenp@3602 1370 }
coleenp@3602 1371
coleenp@3602 1372 #ifdef ASSERT
coleenp@3602 1373 bool Metadebug::test_metadata_failure() {
coleenp@3602 1374 if (MetadataAllocationFailALot &&
coleenp@3602 1375 Threads::is_vm_complete()) {
coleenp@3602 1376 if (_allocation_fail_alot_count > 0) {
coleenp@3602 1377 _allocation_fail_alot_count--;
coleenp@3602 1378 } else {
coleenp@3602 1379 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1380 gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@3602 1381 "MetadataAllocationFailALot");
coleenp@3602 1382 }
coleenp@3602 1383 init_allocation_fail_alot_count();
coleenp@3602 1384 return true;
coleenp@3602 1385 }
coleenp@3602 1386 }
coleenp@3602 1387 return false;
coleenp@3602 1388 }
coleenp@3602 1389 #endif
coleenp@3602 1390
coleenp@3602 1391 // ChunkList methods
coleenp@3602 1392
coleenp@3602 1393 size_t ChunkList::sum_list_size() {
coleenp@3602 1394 size_t result = 0;
coleenp@3602 1395 Metachunk* cur = head();
coleenp@3602 1396 while (cur != NULL) {
coleenp@3602 1397 result += cur->word_size();
coleenp@3602 1398 cur = cur->next();
coleenp@3602 1399 }
coleenp@3602 1400 return result;
coleenp@3602 1401 }
coleenp@3602 1402
coleenp@3602 1403 size_t ChunkList::sum_list_count() {
coleenp@3602 1404 size_t result = 0;
coleenp@3602 1405 Metachunk* cur = head();
coleenp@3602 1406 while (cur != NULL) {
coleenp@3602 1407 result++;
coleenp@3602 1408 cur = cur->next();
coleenp@3602 1409 }
coleenp@3602 1410 return result;
coleenp@3602 1411 }
coleenp@3602 1412
coleenp@3602 1413 size_t ChunkList::sum_list_capacity() {
coleenp@3602 1414 size_t result = 0;
coleenp@3602 1415 Metachunk* cur = head();
coleenp@3602 1416 while (cur != NULL) {
coleenp@3602 1417 result += cur->capacity_word_size();
coleenp@3602 1418 cur = cur->next();
coleenp@3602 1419 }
coleenp@3602 1420 return result;
coleenp@3602 1421 }
coleenp@3602 1422
coleenp@3602 1423 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) {
coleenp@3602 1424 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1425 assert(head == tail || tail->next() == NULL,
jmasa@3947 1426 "Not the tail or the head has already been added to a list");
coleenp@3602 1427
coleenp@3602 1428 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1429 gclog_or_tty->print("ChunkList::add_at_head(head, tail): ");
coleenp@3602 1430 Metachunk* cur = head;
coleenp@3602 1431 while (cur != NULL) {
jmasa@3947 1432 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size());
coleenp@3602 1433 cur = cur->next();
coleenp@3602 1434 }
jmasa@3947 1435 gclog_or_tty->print_cr("");
coleenp@3602 1436 }
coleenp@3602 1437
coleenp@3602 1438 if (tail != NULL) {
coleenp@3602 1439 tail->set_next(_head);
coleenp@3602 1440 }
coleenp@3602 1441 set_head(head);
coleenp@3602 1442 }
coleenp@3602 1443
coleenp@3602 1444 void ChunkList::add_at_head(Metachunk* list) {
coleenp@3602 1445 if (list == NULL) {
coleenp@3602 1446 // Nothing to add
coleenp@3602 1447 return;
coleenp@3602 1448 }
coleenp@3602 1449 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1450 Metachunk* head = list;
coleenp@3602 1451 Metachunk* tail = list;
coleenp@3602 1452 Metachunk* cur = head->next();
coleenp@3602 1453 // Search for the tail since it is not passed.
coleenp@3602 1454 while (cur != NULL) {
coleenp@3602 1455 tail = cur;
coleenp@3602 1456 cur = cur->next();
coleenp@3602 1457 }
coleenp@3602 1458 add_at_head(head, tail);
coleenp@3602 1459 }
coleenp@3602 1460
coleenp@3602 1461 // ChunkManager methods
coleenp@3602 1462
coleenp@3602 1463 // Verification of _free_chunks_total and _free_chunks_count does not
coleenp@3602 1464 // work with the CMS collector because its use of additional locks
coleenp@3602 1465 // complicate the mutex deadlock detection but it can still be useful
coleenp@3602 1466 // for detecting errors in the chunk accounting with other collectors.
coleenp@3602 1467
coleenp@3602 1468 size_t ChunkManager::free_chunks_total() {
coleenp@3602 1469 #ifdef ASSERT
coleenp@3602 1470 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1471 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1472 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1473 slow_locked_verify_free_chunks_total();
coleenp@3602 1474 }
coleenp@3602 1475 #endif
coleenp@3602 1476 return _free_chunks_total;
coleenp@3602 1477 }
coleenp@3602 1478
coleenp@3602 1479 size_t ChunkManager::free_chunks_total_in_bytes() {
coleenp@3602 1480 return free_chunks_total() * BytesPerWord;
coleenp@3602 1481 }
coleenp@3602 1482
coleenp@3602 1483 size_t ChunkManager::free_chunks_count() {
coleenp@3602 1484 #ifdef ASSERT
coleenp@3602 1485 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@3602 1486 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1487 Mutex::_no_safepoint_check_flag);
coleenp@3602 1488 // This lock is only needed in debug because the verification
coleenp@3602 1489 // of the _free_chunks_totals walks the list of free chunks
mgerdin@3829 1490 slow_locked_verify_free_chunks_count();
coleenp@3602 1491 }
coleenp@3602 1492 #endif
mgerdin@3829 1493 return _free_chunks_count;
coleenp@3602 1494 }
coleenp@3602 1495
coleenp@3602 1496 void ChunkManager::locked_verify_free_chunks_total() {
coleenp@3602 1497 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1498 assert(sum_free_chunks() == _free_chunks_total,
coleenp@3602 1499 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@3602 1500 " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@3602 1501 sum_free_chunks()));
coleenp@3602 1502 }
coleenp@3602 1503
coleenp@3602 1504 void ChunkManager::verify_free_chunks_total() {
coleenp@3602 1505 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1506 Mutex::_no_safepoint_check_flag);
coleenp@3602 1507 locked_verify_free_chunks_total();
coleenp@3602 1508 }
coleenp@3602 1509
coleenp@3602 1510 void ChunkManager::locked_verify_free_chunks_count() {
coleenp@3602 1511 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1512 assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@3602 1513 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@3602 1514 " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@3602 1515 sum_free_chunks_count()));
coleenp@3602 1516 }
coleenp@3602 1517
coleenp@3602 1518 void ChunkManager::verify_free_chunks_count() {
coleenp@3602 1519 #ifdef ASSERT
coleenp@3602 1520 MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@3602 1521 Mutex::_no_safepoint_check_flag);
coleenp@3602 1522 locked_verify_free_chunks_count();
coleenp@3602 1523 #endif
coleenp@3602 1524 }
coleenp@3602 1525
coleenp@3602 1526 void ChunkManager::verify() {
mgerdin@3829 1527 MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@3829 1528 Mutex::_no_safepoint_check_flag);
mgerdin@3829 1529 locked_verify();
coleenp@3602 1530 }
coleenp@3602 1531
coleenp@3602 1532 void ChunkManager::locked_verify() {
jmasa@3761 1533 locked_verify_free_chunks_count();
coleenp@3602 1534 locked_verify_free_chunks_total();
coleenp@3602 1535 }
coleenp@3602 1536
coleenp@3602 1537 void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@3602 1538 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1539 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1540 _free_chunks_total, _free_chunks_count);
coleenp@3602 1541 }
coleenp@3602 1542
coleenp@3602 1543 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@3602 1544 assert_lock_strong(SpaceManager::expand_lock());
jmasa@3947 1545 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
coleenp@3602 1546 sum_free_chunks(), sum_free_chunks_count());
coleenp@3602 1547 }
coleenp@3602 1548 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@3602 1549 return &_free_chunks[index];
coleenp@3602 1550 }
coleenp@3602 1551
coleenp@3602 1552 // These methods that sum the free chunk lists are used in printing
coleenp@3602 1553 // methods that are used in product builds.
coleenp@3602 1554 size_t ChunkManager::sum_free_chunks() {
coleenp@3602 1555 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1556 size_t result = 0;
jmasa@3947 1557 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1558 ChunkList* list = free_chunks(i);
coleenp@3602 1559
coleenp@3602 1560 if (list == NULL) {
coleenp@3602 1561 continue;
coleenp@3602 1562 }
coleenp@3602 1563
coleenp@3602 1564 result = result + list->sum_list_capacity();
coleenp@3602 1565 }
jmasa@3761 1566 result = result + humongous_dictionary()->total_size();
coleenp@3602 1567 return result;
coleenp@3602 1568 }
coleenp@3602 1569
coleenp@3602 1570 size_t ChunkManager::sum_free_chunks_count() {
coleenp@3602 1571 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1572 size_t count = 0;
jmasa@3947 1573 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@3602 1574 ChunkList* list = free_chunks(i);
coleenp@3602 1575 if (list == NULL) {
coleenp@3602 1576 continue;
coleenp@3602 1577 }
coleenp@3602 1578 count = count + list->sum_list_count();
coleenp@3602 1579 }
jmasa@3761 1580 count = count + humongous_dictionary()->total_free_blocks();
coleenp@3602 1581 return count;
coleenp@3602 1582 }
coleenp@3602 1583
coleenp@3602 1584 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@3947 1585 ChunkIndex index = list_index(word_size);
jmasa@3947 1586 assert(index < HumongousIndex, "No humongous list");
jmasa@3947 1587 return free_chunks(index);
coleenp@3602 1588 }
coleenp@3602 1589
coleenp@3602 1590 void ChunkManager::free_chunks_put(Metachunk* chunk) {
coleenp@3602 1591 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1592 ChunkList* free_list = find_free_chunks_list(chunk->word_size());
coleenp@3602 1593 chunk->set_next(free_list->head());
coleenp@3602 1594 free_list->set_head(chunk);
coleenp@3602 1595 // chunk is being returned to the chunk free list
coleenp@3602 1596 inc_free_chunks_total(chunk->capacity_word_size());
mgerdin@3829 1597 slow_locked_verify();
coleenp@3602 1598 }
coleenp@3602 1599
coleenp@3602 1600 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
coleenp@3602 1601 // The deallocation of a chunk originates in the freelist
coleenp@3602 1602 // manangement code for a Metaspace and does not hold the
coleenp@3602 1603 // lock.
coleenp@3602 1604 assert(chunk != NULL, "Deallocating NULL");
mgerdin@3829 1605 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1606 slow_locked_verify();
coleenp@3602 1607 if (TraceMetadataChunkAllocation) {
coleenp@3602 1608 tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
coleenp@3602 1609 PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1610 chunk, chunk->word_size());
coleenp@3602 1611 }
coleenp@3602 1612 free_chunks_put(chunk);
coleenp@3602 1613 }
coleenp@3602 1614
coleenp@3602 1615 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@3602 1616 assert_lock_strong(SpaceManager::expand_lock());
coleenp@3602 1617
mgerdin@3829 1618 slow_locked_verify();
jmasa@3761 1619
jmasa@3761 1620 Metachunk* chunk = NULL;
jmasa@3947 1621 if (list_index(word_size) != HumongousIndex) {
jmasa@3761 1622 ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@3761 1623 assert(free_list != NULL, "Sanity check");
jmasa@3761 1624
jmasa@3761 1625 chunk = free_list->head();
jmasa@3761 1626 debug_only(Metachunk* debug_head = chunk;)
jmasa@3761 1627
jmasa@3761 1628 if (chunk == NULL) {
jmasa@3761 1629 return NULL;
jmasa@3761 1630 }
jmasa@3761 1631
coleenp@3602 1632 // Remove the chunk as the head of the list.
coleenp@3602 1633 free_list->set_head(chunk->next());
jmasa@3947 1634
jmasa@3947 1635 // Chunk is being removed from the chunks free list.
jmasa@3761 1636 dec_free_chunks_total(chunk->capacity_word_size());
coleenp@3602 1637
coleenp@3602 1638 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1639 tty->print_cr("ChunkManager::free_chunks_get: free_list "
coleenp@3602 1640 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
coleenp@3602 1641 free_list, chunk, chunk->word_size());
coleenp@3602 1642 }
coleenp@3602 1643 } else {
jmasa@3761 1644 chunk = humongous_dictionary()->get_chunk(
jmasa@3761 1645 word_size,
jmasa@3761 1646 FreeBlockDictionary<Metachunk>::atLeast);
jmasa@3761 1647
jmasa@3761 1648 if (chunk != NULL) {
jmasa@3761 1649 if (TraceMetadataHumongousAllocation) {
jmasa@3761 1650 size_t waste = chunk->word_size() - word_size;
jmasa@3761 1651 tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
jmasa@3761 1652 " for requested size " SIZE_FORMAT
jmasa@3761 1653 " waste " SIZE_FORMAT,
jmasa@3761 1654 chunk->word_size(), word_size, waste);
coleenp@3602 1655 }
jmasa@3761 1656 // Chunk is being removed from the chunks free list.
jmasa@3761 1657 dec_free_chunks_total(chunk->capacity_word_size());
jmasa@3761 1658 #ifdef ASSERT
jmasa@3761 1659 chunk->set_is_free(false);
jmasa@3761 1660 #endif
jmasa@3947 1661 } else {
jmasa@3947 1662 return NULL;
coleenp@3602 1663 }
coleenp@3602 1664 }
jmasa@3947 1665
jmasa@3947 1666 // Remove it from the links to this freelist
jmasa@3947 1667 chunk->set_next(NULL);
jmasa@3947 1668 chunk->set_prev(NULL);
mgerdin@3829 1669 slow_locked_verify();
coleenp@3602 1670 return chunk;
coleenp@3602 1671 }
coleenp@3602 1672
coleenp@3602 1673 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@3602 1674 assert_lock_strong(SpaceManager::expand_lock());
mgerdin@3829 1675 slow_locked_verify();
coleenp@3602 1676
coleenp@3602 1677 // Take from the beginning of the list
coleenp@3602 1678 Metachunk* chunk = free_chunks_get(word_size);
coleenp@3602 1679 if (chunk == NULL) {
coleenp@3602 1680 return NULL;
coleenp@3602 1681 }
coleenp@3602 1682
jmasa@3947 1683 assert((word_size <= chunk->word_size()) ||
jmasa@3947 1684 list_index(chunk->word_size() == HumongousIndex),
jmasa@3947 1685 "Non-humongous variable sized chunk");
coleenp@3602 1686 if (TraceMetadataChunkAllocation) {
jmasa@3947 1687 size_t list_count;
jmasa@3947 1688 if (list_index(word_size) < HumongousIndex) {
jmasa@3947 1689 ChunkList* list = find_free_chunks_list(word_size);
jmasa@3947 1690 list_count = list->sum_list_count();
jmasa@3947 1691 } else {
jmasa@3947 1692 list_count = humongous_dictionary()->total_count();
jmasa@3947 1693 }
jmasa@3947 1694 tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
jmasa@3947 1695 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
jmasa@3947 1696 this, chunk, chunk->word_size(), list_count);
coleenp@3602 1697 locked_print_free_chunks(tty);
coleenp@3602 1698 }
coleenp@3602 1699
coleenp@3602 1700 return chunk;
coleenp@3602 1701 }
coleenp@3602 1702
jmasa@3761 1703 void ChunkManager::print_on(outputStream* out) {
jmasa@3761 1704 if (PrintFLSStatistics != 0) {
jmasa@3761 1705 humongous_dictionary()->report_statistics();
jmasa@3761 1706 }
jmasa@3761 1707 }
jmasa@3761 1708
coleenp@3602 1709 // SpaceManager methods
coleenp@3602 1710
jmasa@3947 1711 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@3947 1712 size_t* chunk_word_size,
jmasa@3947 1713 size_t* class_chunk_word_size) {
jmasa@3947 1714 switch (type) {
jmasa@3947 1715 case Metaspace::BootMetaspaceType:
jmasa@3947 1716 *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@3947 1717 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@3947 1718 break;
jmasa@3947 1719 case Metaspace::ROMetaspaceType:
jmasa@3947 1720 *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@3947 1721 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1722 break;
jmasa@3947 1723 case Metaspace::ReadWriteMetaspaceType:
jmasa@3947 1724 *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@3947 1725 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1726 break;
jmasa@3947 1727 case Metaspace::AnonymousMetaspaceType:
jmasa@3947 1728 case Metaspace::ReflectionMetaspaceType:
jmasa@3947 1729 *chunk_word_size = SpecializedChunk;
jmasa@3947 1730 *class_chunk_word_size = ClassSpecializedChunk;
jmasa@3947 1731 break;
jmasa@3947 1732 default:
jmasa@3947 1733 *chunk_word_size = SmallChunk;
jmasa@3947 1734 *class_chunk_word_size = ClassSmallChunk;
jmasa@3947 1735 break;
jmasa@3947 1736 }
mikael@4113 1737 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@3947 1738 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
jmasa@3947 1739 " class " SIZE_FORMAT,
mikael@4113 1740 *chunk_word_size, *class_chunk_word_size));
jmasa@3947 1741 }
jmasa@3947 1742
coleenp@3602 1743 size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@3602 1744 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1745 size_t free = 0;
jmasa@3947 1746 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1747 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1748 while (chunk != NULL) {
coleenp@3602 1749 free += chunk->free_word_size();
coleenp@3602 1750 chunk = chunk->next();
coleenp@3602 1751 }
coleenp@3602 1752 }
coleenp@3602 1753 return free;
coleenp@3602 1754 }
coleenp@3602 1755
coleenp@3602 1756 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@3602 1757 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1758 size_t result = 0;
jmasa@3947 1759 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1760 result += sum_waste_in_chunks_in_use(i);
coleenp@3602 1761 }
jmasa@3761 1762
coleenp@3602 1763 return result;
coleenp@3602 1764 }
coleenp@3602 1765
coleenp@3602 1766 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@3602 1767 size_t result = 0;
coleenp@3602 1768 Metachunk* chunk = chunks_in_use(index);
coleenp@3602 1769 // Count the free space in all the chunk but not the
coleenp@3602 1770 // current chunk from which allocations are still being done.
coleenp@3602 1771 if (chunk != NULL) {
jmasa@3761 1772 Metachunk* prev = chunk;
jmasa@3761 1773 while (chunk != NULL && chunk != current_chunk()) {
jmasa@3761 1774 result += chunk->free_word_size();
jmasa@3761 1775 prev = chunk;
coleenp@3602 1776 chunk = chunk->next();
coleenp@3602 1777 }
coleenp@3602 1778 }
coleenp@3602 1779 return result;
coleenp@3602 1780 }
coleenp@3602 1781
coleenp@3602 1782 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
coleenp@3602 1783 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1784 size_t sum = 0;
jmasa@3947 1785 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1786 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1787 while (chunk != NULL) {
coleenp@3602 1788 // Just changed this sum += chunk->capacity_word_size();
coleenp@3602 1789 // sum += chunk->word_size() - Metachunk::overhead();
coleenp@3602 1790 sum += chunk->capacity_word_size();
coleenp@3602 1791 chunk = chunk->next();
coleenp@3602 1792 }
coleenp@3602 1793 }
coleenp@3602 1794 return sum;
coleenp@3602 1795 }
coleenp@3602 1796
coleenp@3602 1797 size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@3602 1798 size_t count = 0;
jmasa@3947 1799 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1800 count = count + sum_count_in_chunks_in_use(i);
coleenp@3602 1801 }
jmasa@3761 1802
coleenp@3602 1803 return count;
coleenp@3602 1804 }
coleenp@3602 1805
coleenp@3602 1806 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@3602 1807 size_t count = 0;
coleenp@3602 1808 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1809 while (chunk != NULL) {
coleenp@3602 1810 count++;
coleenp@3602 1811 chunk = chunk->next();
coleenp@3602 1812 }
coleenp@3602 1813 return count;
coleenp@3602 1814 }
coleenp@3602 1815
coleenp@3602 1816
coleenp@3602 1817 size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@3602 1818 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1819 size_t used = 0;
jmasa@3947 1820 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1821 Metachunk* chunk = chunks_in_use(i);
coleenp@3602 1822 while (chunk != NULL) {
coleenp@3602 1823 used += chunk->used_word_size();
coleenp@3602 1824 chunk = chunk->next();
coleenp@3602 1825 }
coleenp@3602 1826 }
coleenp@3602 1827 return used;
coleenp@3602 1828 }
coleenp@3602 1829
coleenp@3602 1830 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@3602 1831
jmasa@3947 1832 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@3947 1833 Metachunk* chunk = chunks_in_use(i);
jmasa@3947 1834 st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@3947 1835 chunk_size_name(i), chunk);
jmasa@3947 1836 if (chunk != NULL) {
jmasa@3947 1837 st->print_cr(" free " SIZE_FORMAT,
jmasa@3947 1838 chunk->free_word_size());
jmasa@3947 1839 } else {
jmasa@3947 1840 st->print_cr("");
jmasa@3947 1841 }
jmasa@3947 1842 }
coleenp@3602 1843
coleenp@3602 1844 vs_list()->chunk_manager()->locked_print_free_chunks(st);
coleenp@3602 1845 vs_list()->chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@3602 1846 }
coleenp@3602 1847
coleenp@3602 1848 size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@3602 1849
coleenp@3602 1850 // Decide between a small chunk and a medium chunk. Up to
coleenp@3602 1851 // _small_chunk_limit small chunks can be allocated but
coleenp@3602 1852 // once a medium chunk has been allocated, no more small
coleenp@3602 1853 // chunks will be allocated.
coleenp@3602 1854 size_t chunk_word_size;
coleenp@3602 1855 if (chunks_in_use(MediumIndex) == NULL &&
coleenp@3602 1856 (!has_small_chunk_limit() ||
coleenp@3602 1857 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
jmasa@3947 1858 chunk_word_size = (size_t) small_chunk_size();
jmasa@3947 1859 if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@3947 1860 chunk_word_size = medium_chunk_size();
coleenp@3602 1861 }
coleenp@3602 1862 } else {
jmasa@3947 1863 chunk_word_size = medium_chunk_size();
coleenp@3602 1864 }
coleenp@3602 1865
jmasa@3947 1866 // Might still need a humongous chunk. Enforce an
jmasa@3947 1867 // eight word granularity to facilitate reuse (some
jmasa@3947 1868 // wastage but better chance of reuse).
jmasa@3947 1869 size_t if_humongous_sized_chunk =
jmasa@3947 1870 align_size_up(word_size + Metachunk::overhead(),
jmasa@3947 1871 HumongousChunkGranularity);
coleenp@3602 1872 chunk_word_size =
jmasa@3947 1873 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@3947 1874
jmasa@3947 1875 assert(!SpaceManager::is_humongous(word_size) ||
jmasa@3947 1876 chunk_word_size == if_humongous_sized_chunk,
jmasa@3947 1877 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@3947 1878 " chunk_word_size " SIZE_FORMAT,
jmasa@3947 1879 word_size, chunk_word_size));
coleenp@3602 1880 if (TraceMetadataHumongousAllocation &&
coleenp@3602 1881 SpaceManager::is_humongous(word_size)) {
coleenp@3602 1882 gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@3602 1883 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
coleenp@3602 1884 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
coleenp@3602 1885 chunk_word_size);
jmasa@3761 1886 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
coleenp@3602 1887 Metachunk::overhead());
coleenp@3602 1888 }
coleenp@3602 1889 return chunk_word_size;
coleenp@3602 1890 }
coleenp@3602 1891
jmasa@3761 1892 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@3602 1893 assert(vs_list()->current_virtual_space() != NULL,
coleenp@3602 1894 "Should have been set");
coleenp@3602 1895 assert(current_chunk() == NULL ||
coleenp@3602 1896 current_chunk()->allocate(word_size) == NULL,
coleenp@3602 1897 "Don't need to expand");
coleenp@3602 1898 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 1899
coleenp@3602 1900 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 1901 size_t words_left = 0;
jmasa@3947 1902 size_t words_used = 0;
jmasa@3947 1903 if (current_chunk() != NULL) {
jmasa@3947 1904 words_left = current_chunk()->free_word_size();
jmasa@3947 1905 words_used = current_chunk()->used_word_size();
jmasa@3947 1906 }
coleenp@3602 1907 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@3947 1908 " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@3947 1909 " words left",
jmasa@3947 1910 word_size, words_used, words_left);
coleenp@3602 1911 }
coleenp@3602 1912
coleenp@3602 1913 // Get another chunk out of the virtual space
coleenp@3602 1914 size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@3947 1915 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@3602 1916
coleenp@3602 1917 // If a chunk was available, add it to the in-use chunk list
coleenp@3602 1918 // and do an allocation from it.
coleenp@3602 1919 if (next != NULL) {
coleenp@3602 1920 Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
coleenp@3602 1921 // Add to this manager's list of chunks in use.
coleenp@3602 1922 add_chunk(next, false);
coleenp@3602 1923 return next->allocate(word_size);
coleenp@3602 1924 }
coleenp@3602 1925 return NULL;
coleenp@3602 1926 }
coleenp@3602 1927
coleenp@3602 1928 void SpaceManager::print_on(outputStream* st) const {
coleenp@3602 1929
jmasa@3947 1930 for (ChunkIndex i = ZeroIndex;
jmasa@3761 1931 i < NumberOfInUseLists ;
coleenp@3602 1932 i = next_chunk_index(i) ) {
coleenp@3602 1933 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@3602 1934 chunks_in_use(i),
coleenp@3602 1935 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@3602 1936 }
coleenp@3602 1937 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@3602 1938 " Humongous " SIZE_FORMAT,
coleenp@3602 1939 sum_waste_in_chunks_in_use(SmallIndex),
coleenp@3602 1940 sum_waste_in_chunks_in_use(MediumIndex),
coleenp@3602 1941 sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@3761 1942 // block free lists
jmasa@3761 1943 if (block_freelists() != NULL) {
jmasa@3761 1944 st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@3761 1945 block_freelists()->total_size());
jmasa@3761 1946 }
coleenp@3602 1947 }
coleenp@3602 1948
jmasa@3947 1949 SpaceManager::SpaceManager(Mutex* lock,
jmasa@3947 1950 VirtualSpaceList* vs_list) :
coleenp@3602 1951 _vs_list(vs_list),
coleenp@3602 1952 _allocation_total(0),
jmasa@3947 1953 _lock(lock)
jmasa@3947 1954 {
jmasa@3947 1955 initialize();
jmasa@3947 1956 }
jmasa@3947 1957
jmasa@3947 1958 void SpaceManager::initialize() {
coleenp@3602 1959 Metadebug::init_allocation_fail_alot_count();
jmasa@3947 1960 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 1961 _chunks_in_use[i] = NULL;
coleenp@3602 1962 }
coleenp@3602 1963 _current_chunk = NULL;
coleenp@3602 1964 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1965 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1966 }
coleenp@3602 1967 }
coleenp@3602 1968
coleenp@3602 1969 SpaceManager::~SpaceManager() {
mgerdin@4349 1970 // This call this->_lock which can't be done while holding expand_lock()
mgerdin@4349 1971 const size_t in_use_before = sum_capacity_in_chunks_in_use();
mgerdin@4349 1972
coleenp@3602 1973 MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@3602 1974 Mutex::_no_safepoint_check_flag);
coleenp@3602 1975
coleenp@3602 1976 ChunkManager* chunk_manager = vs_list()->chunk_manager();
coleenp@3602 1977
mgerdin@3829 1978 chunk_manager->slow_locked_verify();
coleenp@3602 1979
coleenp@3602 1980 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 1981 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@3602 1982 locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@3602 1983 }
coleenp@3602 1984
coleenp@3869 1985 // Mangle freed memory.
coleenp@3869 1986 NOT_PRODUCT(mangle_freed_chunks();)
coleenp@3869 1987
coleenp@3602 1988 // Have to update before the chunks_in_use lists are emptied
coleenp@3602 1989 // below.
mgerdin@4349 1990 chunk_manager->inc_free_chunks_total(in_use_before,
coleenp@3602 1991 sum_count_in_chunks_in_use());
coleenp@3602 1992
coleenp@3602 1993 // Add all the chunks in use by this space manager
coleenp@3602 1994 // to the global list of free chunks.
coleenp@3602 1995
jmasa@3947 1996 // Follow each list of chunks-in-use and add them to the
jmasa@3947 1997 // free lists. Each list is NULL terminated.
jmasa@3947 1998
jmasa@3947 1999 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@3947 2000 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2001 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@3947 2002 sum_count_in_chunks_in_use(i),
jmasa@3947 2003 chunk_size_name(i));
jmasa@3947 2004 }
jmasa@3947 2005 Metachunk* chunks = chunks_in_use(i);
jmasa@3947 2006 chunk_manager->free_chunks(i)->add_at_head(chunks);
jmasa@3947 2007 set_chunks_in_use(i, NULL);
jmasa@3947 2008 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2009 gclog_or_tty->print_cr("updated freelist count %d %s",
jmasa@3947 2010 chunk_manager->free_chunks(i)->sum_list_count(),
jmasa@3947 2011 chunk_size_name(i));
jmasa@3947 2012 }
jmasa@3947 2013 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@3602 2014 }
coleenp@3602 2015
jmasa@3947 2016 // The medium chunk case may be optimized by passing the head and
jmasa@3947 2017 // tail of the medium chunk list to add_at_head(). The tail is often
jmasa@3947 2018 // the current chunk but there are probably exceptions.
jmasa@3947 2019
coleenp@3602 2020 // Humongous chunks
jmasa@3947 2021 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2022 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@3947 2023 sum_count_in_chunks_in_use(HumongousIndex),
jmasa@3947 2024 chunk_size_name(HumongousIndex));
jmasa@3947 2025 gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@3947 2026 }
coleenp@3602 2027 // Humongous chunks are never the current chunk.
coleenp@3602 2028 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@3602 2029
jmasa@3761 2030 while (humongous_chunks != NULL) {
jmasa@3761 2031 #ifdef ASSERT
jmasa@3761 2032 humongous_chunks->set_is_free(true);
jmasa@3761 2033 #endif
jmasa@3947 2034 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2035 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@3947 2036 humongous_chunks,
jmasa@3947 2037 humongous_chunks->word_size());
jmasa@3947 2038 }
jmasa@3947 2039 assert(humongous_chunks->word_size() == (size_t)
jmasa@3947 2040 align_size_up(humongous_chunks->word_size(),
jmasa@3947 2041 HumongousChunkGranularity),
jmasa@3947 2042 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4113 2043 " granularity %d",
jmasa@3947 2044 humongous_chunks->word_size(), HumongousChunkGranularity));
jmasa@3761 2045 Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@3761 2046 chunk_manager->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@3761 2047 humongous_chunks = next_humongous_chunks;
coleenp@3602 2048 }
jmasa@3947 2049 if (TraceMetadataChunkAllocation && Verbose) {
jmasa@3947 2050 gclog_or_tty->print_cr("");
jmasa@3947 2051 gclog_or_tty->print_cr("updated dictionary count %d %s",
jmasa@3947 2052 chunk_manager->humongous_dictionary()->total_count(),
jmasa@3947 2053 chunk_size_name(HumongousIndex));
jmasa@3947 2054 }
jmasa@3761 2055 set_chunks_in_use(HumongousIndex, NULL);
mgerdin@3829 2056 chunk_manager->slow_locked_verify();
coleenp@3602 2057 }
coleenp@3602 2058
jmasa@3947 2059 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@3947 2060 switch (index) {
jmasa@3947 2061 case SpecializedIndex:
jmasa@3947 2062 return "Specialized";
jmasa@3947 2063 case SmallIndex:
jmasa@3947 2064 return "Small";
jmasa@3947 2065 case MediumIndex:
jmasa@3947 2066 return "Medium";
jmasa@3947 2067 case HumongousIndex:
jmasa@3947 2068 return "Humongous";
jmasa@3947 2069 default:
jmasa@3947 2070 return NULL;
jmasa@3947 2071 }
jmasa@3947 2072 }
jmasa@3947 2073
jmasa@3947 2074 ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@3947 2075 switch (size) {
jmasa@3947 2076 case SpecializedChunk:
jmasa@3947 2077 assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@3947 2078 "Need branch for ClassSpecializedChunk");
jmasa@3947 2079 return SpecializedIndex;
jmasa@3947 2080 case SmallChunk:
jmasa@3947 2081 case ClassSmallChunk:
jmasa@3947 2082 return SmallIndex;
jmasa@3947 2083 case MediumChunk:
jmasa@3947 2084 case ClassMediumChunk:
jmasa@3947 2085 return MediumIndex;
jmasa@3947 2086 default:
jmasa@3948 2087 assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@3947 2088 "Not a humongous chunk");
jmasa@3947 2089 return HumongousIndex;
jmasa@3947 2090 }
jmasa@3947 2091 }
jmasa@3947 2092
jmasa@3761 2093 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@3602 2094 assert_lock_strong(_lock);
jmasa@3761 2095 size_t min_size = TreeChunk<Metablock, FreeList>::min_size();
jmasa@3761 2096 assert(word_size >= min_size,
jmasa@3761 2097 err_msg("Should not deallocate dark matter " SIZE_FORMAT, word_size));
jmasa@3761 2098 block_freelists()->return_block(p, word_size);
coleenp@3602 2099 }
coleenp@3602 2100
coleenp@3602 2101 // Adds a chunk to the list of chunks in use.
coleenp@3602 2102 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@3602 2103
coleenp@3602 2104 assert(new_chunk != NULL, "Should not be NULL");
coleenp@3602 2105 assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@3602 2106
coleenp@3602 2107 new_chunk->reset_empty();
coleenp@3602 2108
coleenp@3602 2109 // Find the correct list and and set the current
coleenp@3602 2110 // chunk for that list.
jmasa@3947 2111 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@3947 2112
jmasa@3947 2113 if (index != HumongousIndex) {
coleenp@3602 2114 set_current_chunk(new_chunk);
jmasa@3947 2115 new_chunk->set_next(chunks_in_use(index));
jmasa@3947 2116 set_chunks_in_use(index, new_chunk);
jmasa@3947 2117 } else {
coleenp@3602 2118 // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@3602 2119 // small, so small will be null. Link this first chunk as the current
coleenp@3602 2120 // chunk.
coleenp@3602 2121 if (make_current) {
coleenp@3602 2122 // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@3602 2123 set_current_chunk(new_chunk);
coleenp@3602 2124 }
coleenp@3602 2125 // Link at head. The _current_chunk only points to a humongous chunk for
coleenp@3602 2126 // the null class loader metaspace (class and data virtual space managers)
coleenp@3602 2127 // any humongous chunks so will not point to the tail
coleenp@3602 2128 // of the humongous chunks list.
coleenp@3602 2129 new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@3602 2130 set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@3602 2131
jmasa@3948 2132 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@3602 2133 }
coleenp@3602 2134
coleenp@3602 2135 assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@3602 2136 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2137 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@3602 2138 sum_count_in_chunks_in_use());
coleenp@3602 2139 new_chunk->print_on(gclog_or_tty);
coleenp@3602 2140 vs_list()->chunk_manager()->locked_print_free_chunks(tty);
coleenp@3602 2141 }
coleenp@3602 2142 }
coleenp@3602 2143
jmasa@3947 2144 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@3947 2145 size_t grow_chunks_by_words) {
jmasa@3947 2146
jmasa@3947 2147 Metachunk* next = vs_list()->get_new_chunk(word_size,
jmasa@3947 2148 grow_chunks_by_words,
jmasa@3947 2149 medium_chunk_bunch());
jmasa@3947 2150
jmasa@3947 2151 if (TraceMetadataHumongousAllocation &&
jmasa@3947 2152 SpaceManager::is_humongous(next->word_size())) {
jmasa@3947 2153 gclog_or_tty->print_cr(" new humongous chunk word size " PTR_FORMAT,
jmasa@3947 2154 next->word_size());
jmasa@3947 2155 }
jmasa@3947 2156
jmasa@3947 2157 return next;
jmasa@3947 2158 }
jmasa@3947 2159
coleenp@3602 2160 MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@3602 2161 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2162
coleenp@3602 2163 // If only the dictionary is going to be used (i.e., no
coleenp@3602 2164 // indexed free list), then there is a minimum size requirement.
coleenp@3602 2165 // MinChunkSize is a placeholder for the real minimum size JJJ
jmasa@3761 2166 size_t byte_size = word_size * BytesPerWord;
jmasa@3761 2167
jmasa@3761 2168 size_t byte_size_with_overhead = byte_size + Metablock::overhead();
jmasa@3761 2169
jmasa@3761 2170 size_t raw_bytes_size = MAX2(byte_size_with_overhead,
jmasa@3761 2171 Metablock::min_block_byte_size());
jmasa@3761 2172 raw_bytes_size = ARENA_ALIGN(raw_bytes_size);
coleenp@3602 2173 size_t raw_word_size = raw_bytes_size / BytesPerWord;
coleenp@3602 2174 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
coleenp@3602 2175
coleenp@3602 2176 BlockFreelist* fl = block_freelists();
jmasa@3761 2177 MetaWord* p = NULL;
coleenp@3602 2178 // Allocation from the dictionary is expensive in the sense that
coleenp@3602 2179 // the dictionary has to be searched for a size. Don't allocate
coleenp@3602 2180 // from the dictionary until it starts to get fat. Is this
coleenp@3602 2181 // a reasonable policy? Maybe an skinny dictionary is fast enough
coleenp@3602 2182 // for allocations. Do some profiling. JJJ
jmasa@3761 2183 if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@3761 2184 p = fl->get_block(raw_word_size);
coleenp@3602 2185 }
jmasa@3761 2186 if (p == NULL) {
jmasa@3761 2187 p = allocate_work(raw_word_size);
coleenp@3602 2188 }
coleenp@3602 2189 Metadebug::deallocate_block_a_lot(this, raw_word_size);
coleenp@3602 2190
jmasa@3761 2191 return p;
coleenp@3602 2192 }
coleenp@3602 2193
coleenp@3602 2194 // Returns the address of spaced allocated for "word_size".
coleenp@3602 2195 // This methods does not know about blocks (Metablocks)
jmasa@3761 2196 MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@3602 2197 assert_lock_strong(_lock);
coleenp@3602 2198 #ifdef ASSERT
coleenp@3602 2199 if (Metadebug::test_metadata_failure()) {
coleenp@3602 2200 return NULL;
coleenp@3602 2201 }
coleenp@3602 2202 #endif
coleenp@3602 2203 // Is there space in the current chunk?
jmasa@3761 2204 MetaWord* result = NULL;
coleenp@3602 2205
coleenp@3602 2206 // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@3602 2207 // never null because we gave it the size we wanted. Caller reports out
coleenp@3602 2208 // of memory if this returns null.
coleenp@3602 2209 if (DumpSharedSpaces) {
coleenp@3602 2210 assert(current_chunk() != NULL, "should never happen");
coleenp@3602 2211 inc_allocation_total(word_size);
coleenp@3602 2212 return current_chunk()->allocate(word_size); // caller handles null result
coleenp@3602 2213 }
coleenp@3602 2214 if (current_chunk() != NULL) {
coleenp@3602 2215 result = current_chunk()->allocate(word_size);
coleenp@3602 2216 }
coleenp@3602 2217
coleenp@3602 2218 if (result == NULL) {
coleenp@3602 2219 result = grow_and_allocate(word_size);
coleenp@3602 2220 }
coleenp@3602 2221 if (result > 0) {
coleenp@3602 2222 inc_allocation_total(word_size);
jmasa@3761 2223 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@3761 2224 "Head of the list is being allocated");
coleenp@3602 2225 }
coleenp@3602 2226
coleenp@3602 2227 return result;
coleenp@3602 2228 }
coleenp@3602 2229
coleenp@3602 2230 void SpaceManager::verify() {
coleenp@3602 2231 // If there are blocks in the dictionary, then
coleenp@3602 2232 // verfication of chunks does not work since
coleenp@3602 2233 // being in the dictionary alters a chunk.
jmasa@3761 2234 if (block_freelists()->total_size() == 0) {
jmasa@3947 2235 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@3602 2236 Metachunk* curr = chunks_in_use(i);
coleenp@3602 2237 while (curr != NULL) {
coleenp@3602 2238 curr->verify();
jmasa@3892 2239 verify_chunk_size(curr);
coleenp@3602 2240 curr = curr->next();
coleenp@3602 2241 }
coleenp@3602 2242 }
coleenp@3602 2243 }
coleenp@3602 2244 }
coleenp@3602 2245
jmasa@3892 2246 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@3892 2247 assert(is_humongous(chunk->word_size()) ||
jmasa@3947 2248 chunk->word_size() == medium_chunk_size() ||
jmasa@3947 2249 chunk->word_size() == small_chunk_size() ||
jmasa@3947 2250 chunk->word_size() == specialized_chunk_size(),
jmasa@3892 2251 "Chunk size is wrong");
jmasa@3892 2252 return;
jmasa@3892 2253 }
jmasa@3892 2254
coleenp@3602 2255 #ifdef ASSERT
coleenp@3602 2256 void SpaceManager::verify_allocation_total() {
coleenp@3602 2257 // Verification is only guaranteed at a safepoint.
coleenp@3602 2258 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2259 gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT
coleenp@3602 2260 " sum_used_in_chunks_in_use " SIZE_FORMAT,
coleenp@3602 2261 this,
coleenp@3602 2262 allocation_total(),
coleenp@3602 2263 sum_used_in_chunks_in_use());
coleenp@3602 2264 }
coleenp@3602 2265 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2266 assert(allocation_total() == sum_used_in_chunks_in_use(),
mikael@4113 2267 err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4113 2268 " vs " SIZE_FORMAT,
coleenp@3602 2269 allocation_total(), sum_used_in_chunks_in_use()));
coleenp@3602 2270 }
coleenp@3602 2271
coleenp@3602 2272 #endif
coleenp@3602 2273
coleenp@3602 2274 void SpaceManager::dump(outputStream* const out) const {
coleenp@3602 2275 size_t curr_total = 0;
coleenp@3602 2276 size_t waste = 0;
coleenp@3602 2277 uint i = 0;
coleenp@3602 2278 size_t used = 0;
coleenp@3602 2279 size_t capacity = 0;
coleenp@3602 2280
coleenp@3602 2281 // Add up statistics for all chunks in this SpaceManager.
jmasa@3947 2282 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2283 index < NumberOfInUseLists;
coleenp@3602 2284 index = next_chunk_index(index)) {
coleenp@3602 2285 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2286 curr != NULL;
coleenp@3602 2287 curr = curr->next()) {
coleenp@3602 2288 out->print("%d) ", i++);
coleenp@3602 2289 curr->print_on(out);
coleenp@3602 2290 if (TraceMetadataChunkAllocation && Verbose) {
coleenp@3602 2291 block_freelists()->print_on(out);
coleenp@3602 2292 }
coleenp@3602 2293 curr_total += curr->word_size();
coleenp@3602 2294 used += curr->used_word_size();
coleenp@3602 2295 capacity += curr->capacity_word_size();
coleenp@3602 2296 waste += curr->free_word_size() + curr->overhead();;
coleenp@3602 2297 }
coleenp@3602 2298 }
coleenp@3602 2299
jmasa@3947 2300 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@3602 2301 // Free space isn't wasted.
coleenp@3602 2302 waste -= free;
coleenp@3602 2303
coleenp@3602 2304 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
coleenp@3602 2305 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@3602 2306 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@3602 2307 }
coleenp@3602 2308
coleenp@3869 2309 #ifndef PRODUCT
coleenp@3602 2310 void SpaceManager::mangle_freed_chunks() {
jmasa@3947 2311 for (ChunkIndex index = ZeroIndex;
jmasa@3761 2312 index < NumberOfInUseLists;
coleenp@3602 2313 index = next_chunk_index(index)) {
coleenp@3602 2314 for (Metachunk* curr = chunks_in_use(index);
coleenp@3602 2315 curr != NULL;
coleenp@3602 2316 curr = curr->next()) {
coleenp@3602 2317 curr->mangle();
coleenp@3602 2318 }
coleenp@3602 2319 }
coleenp@3602 2320 }
coleenp@3869 2321 #endif // PRODUCT
coleenp@3602 2322
coleenp@3602 2323 // MetaspaceAux
coleenp@3602 2324
jmasa@3611 2325 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) {
jmasa@3607 2326 size_t used = 0;
jmasa@3607 2327 ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@3607 2328 while (iter.repeat()) {
jmasa@3607 2329 Metaspace* msp = iter.get_next();
jmasa@3607 2330 // Sum allocation_total for each metaspace
jmasa@3607 2331 if (msp != NULL) {
jmasa@3607 2332 used += msp->used_words(mdtype);
jmasa@3607 2333 }
jmasa@3607 2334 }
jmasa@3607 2335 return used * BytesPerWord;
jmasa@3607 2336 }
jmasa@3607 2337
coleenp@3602 2338 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2339 size_t free = 0;
coleenp@3602 2340 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2341 while (iter.repeat()) {
coleenp@3602 2342 Metaspace* msp = iter.get_next();
coleenp@3602 2343 if (msp != NULL) {
coleenp@3602 2344 free += msp->free_words(mdtype);
coleenp@3602 2345 }
coleenp@3602 2346 }
coleenp@3602 2347 return free * BytesPerWord;
coleenp@3602 2348 }
coleenp@3602 2349
coleenp@3602 2350 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2351 size_t capacity = free_chunks_total(mdtype);
coleenp@3602 2352 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2353 while (iter.repeat()) {
coleenp@3602 2354 Metaspace* msp = iter.get_next();
coleenp@3602 2355 if (msp != NULL) {
coleenp@3602 2356 capacity += msp->capacity_words(mdtype);
coleenp@3602 2357 }
coleenp@3602 2358 }
coleenp@3602 2359 return capacity * BytesPerWord;
coleenp@3602 2360 }
coleenp@3602 2361
coleenp@3602 2362 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2363 size_t reserved = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2364 Metaspace::class_space_list()->virtual_space_total() :
coleenp@3602 2365 Metaspace::space_list()->virtual_space_total();
coleenp@3602 2366 return reserved * BytesPerWord;
coleenp@3602 2367 }
coleenp@3602 2368
jmasa@3947 2369 size_t MetaspaceAux::min_chunk_size() { return Metaspace::first_chunk_word_size(); }
coleenp@3602 2370
coleenp@3602 2371 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
coleenp@3602 2372 ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
coleenp@3602 2373 Metaspace::class_space_list()->chunk_manager() :
coleenp@3602 2374 Metaspace::space_list()->chunk_manager();
mgerdin@3829 2375 chunk->slow_verify();
coleenp@3602 2376 return chunk->free_chunks_total();
coleenp@3602 2377 }
coleenp@3602 2378
coleenp@3602 2379 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
coleenp@3602 2380 return free_chunks_total(mdtype) * BytesPerWord;
coleenp@3602 2381 }
coleenp@3602 2382
coleenp@3602 2383 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@3602 2384 gclog_or_tty->print(", [Metaspace:");
coleenp@3602 2385 if (PrintGCDetails && Verbose) {
coleenp@3602 2386 gclog_or_tty->print(" " SIZE_FORMAT
coleenp@3602 2387 "->" SIZE_FORMAT
coleenp@3602 2388 "(" SIZE_FORMAT "/" SIZE_FORMAT ")",
coleenp@3602 2389 prev_metadata_used,
coleenp@3602 2390 used_in_bytes(),
coleenp@3602 2391 capacity_in_bytes(),
coleenp@3602 2392 reserved_in_bytes());
coleenp@3602 2393 } else {
coleenp@3602 2394 gclog_or_tty->print(" " SIZE_FORMAT "K"
coleenp@3602 2395 "->" SIZE_FORMAT "K"
coleenp@3602 2396 "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)",
coleenp@3602 2397 prev_metadata_used / K,
coleenp@3602 2398 used_in_bytes()/ K,
coleenp@3602 2399 capacity_in_bytes()/K,
coleenp@3602 2400 reserved_in_bytes()/ K);
coleenp@3602 2401 }
coleenp@3602 2402
coleenp@3602 2403 gclog_or_tty->print("]");
coleenp@3602 2404 }
coleenp@3602 2405
coleenp@3602 2406 // This is printed when PrintGCDetails
coleenp@3602 2407 void MetaspaceAux::print_on(outputStream* out) {
coleenp@3602 2408 Metaspace::MetadataType ct = Metaspace::ClassType;
coleenp@3602 2409 Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@3602 2410
coleenp@3602 2411 out->print_cr(" Metaspace total "
coleenp@3602 2412 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2413 " reserved " SIZE_FORMAT "K",
jmasa@3611 2414 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K);
coleenp@3602 2415 out->print_cr(" data space "
coleenp@3602 2416 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2417 " reserved " SIZE_FORMAT "K",
jmasa@3611 2418 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K);
coleenp@3602 2419 out->print_cr(" class space "
coleenp@3602 2420 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
coleenp@3602 2421 " reserved " SIZE_FORMAT "K",
jmasa@3611 2422 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K);
coleenp@3602 2423 }
coleenp@3602 2424
coleenp@3602 2425 // Print information for class space and data space separately.
coleenp@3602 2426 // This is almost the same as above.
coleenp@3602 2427 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
coleenp@3602 2428 size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype);
coleenp@3602 2429 size_t capacity_bytes = capacity_in_bytes(mdtype);
coleenp@3602 2430 size_t used_bytes = used_in_bytes(mdtype);
coleenp@3602 2431 size_t free_bytes = free_in_bytes(mdtype);
coleenp@3602 2432 size_t used_and_free = used_bytes + free_bytes +
coleenp@3602 2433 free_chunks_capacity_bytes;
coleenp@3602 2434 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@3602 2435 "K + unused in chunks " SIZE_FORMAT "K + "
coleenp@3602 2436 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@3602 2437 "K capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@3602 2438 used_bytes / K,
coleenp@3602 2439 free_bytes / K,
coleenp@3602 2440 free_chunks_capacity_bytes / K,
coleenp@3602 2441 used_and_free / K,
coleenp@3602 2442 capacity_bytes / K);
mgerdin@4303 2443 // Accounting can only be correct if we got the values during a safepoint
mgerdin@4303 2444 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@3602 2445 }
coleenp@3602 2446
coleenp@3602 2447 // Print total fragmentation for class and data metaspaces separately
coleenp@3602 2448 void MetaspaceAux::print_waste(outputStream* out) {
coleenp@3602 2449
jmasa@3947 2450 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0, large_waste = 0;
jmasa@3947 2451 size_t specialized_count = 0, small_count = 0, medium_count = 0, large_count = 0;
jmasa@3947 2452 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
jmasa@3947 2453 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_large_count = 0;
coleenp@3602 2454
coleenp@3602 2455 ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@3602 2456 while (iter.repeat()) {
coleenp@3602 2457 Metaspace* msp = iter.get_next();
coleenp@3602 2458 if (msp != NULL) {
jmasa@3947 2459 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2460 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2461 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2462 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2463 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2464 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2465 large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2466 large_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
jmasa@3947 2467
jmasa@3947 2468 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@3947 2469 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@3602 2470 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@3947 2471 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@3602 2472 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@3947 2473 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@3602 2474 cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
jmasa@3947 2475 cls_large_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@3602 2476 }
coleenp@3602 2477 }
coleenp@3602 2478 out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@3947 2479 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2480 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
jmasa@3947 2481 SIZE_FORMAT " medium(s) " SIZE_FORMAT,
jmasa@3947 2482 specialized_count, specialized_waste, small_count,
jmasa@3947 2483 small_waste, medium_count, medium_waste);
jmasa@3947 2484 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@3947 2485 SIZE_FORMAT " small(s) " SIZE_FORMAT,
jmasa@3947 2486 cls_specialized_count, cls_specialized_waste,
jmasa@3947 2487 cls_small_count, cls_small_waste);
coleenp@3602 2488 }
coleenp@3602 2489
coleenp@3602 2490 // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@3602 2491 void MetaspaceAux::dump(outputStream* out) {
coleenp@3602 2492 out->print_cr("All Metaspace:");
coleenp@3602 2493 out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@3602 2494 out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@3602 2495 print_waste(out);
coleenp@3602 2496 }
coleenp@3602 2497
mgerdin@3829 2498 void MetaspaceAux::verify_free_chunks() {
mgerdin@3829 2499 Metaspace::space_list()->chunk_manager()->verify();
mgerdin@3829 2500 Metaspace::class_space_list()->chunk_manager()->verify();
mgerdin@3829 2501 }
mgerdin@3829 2502
coleenp@3602 2503 // Metaspace methods
coleenp@3602 2504
coleenp@3602 2505 size_t Metaspace::_first_chunk_word_size = 0;
jmasa@3947 2506 size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@3947 2507
jmasa@3947 2508 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@3947 2509 initialize(lock, type);
coleenp@3602 2510 }
coleenp@3602 2511
coleenp@3602 2512 Metaspace::~Metaspace() {
coleenp@3602 2513 delete _vsm;
coleenp@3602 2514 delete _class_vsm;
coleenp@3602 2515 }
coleenp@3602 2516
coleenp@3602 2517 VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@3602 2518 VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@3602 2519
coleenp@3602 2520 #define VIRTUALSPACEMULTIPLIER 2
coleenp@3602 2521
coleenp@3602 2522 void Metaspace::global_initialize() {
coleenp@3602 2523 // Initialize the alignment for shared spaces.
coleenp@3602 2524 int max_alignment = os::vm_page_size();
coleenp@3602 2525 MetaspaceShared::set_max_alignment(max_alignment);
coleenp@3602 2526
coleenp@3602 2527 if (DumpSharedSpaces) {
coleenp@3602 2528 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
coleenp@3602 2529 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
coleenp@3602 2530 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
coleenp@3602 2531 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
coleenp@3602 2532
coleenp@3602 2533 // Initialize with the sum of the shared space sizes. The read-only
coleenp@3602 2534 // and read write metaspace chunks will be allocated out of this and the
coleenp@3602 2535 // remainder is the misc code and data chunks.
coleenp@3602 2536 size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@3602 2537 SharedMiscDataSize + SharedMiscCodeSize,
coleenp@3602 2538 os::vm_allocation_granularity());
coleenp@3602 2539 size_t word_size = total/wordSize;
coleenp@3602 2540 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2541 } else {
coleenp@3602 2542 // If using shared space, open the file that contains the shared space
coleenp@3602 2543 // and map in the memory before initializing the rest of metaspace (so
coleenp@3602 2544 // the addresses don't conflict)
coleenp@3602 2545 if (UseSharedSpaces) {
coleenp@3602 2546 FileMapInfo* mapinfo = new FileMapInfo();
coleenp@3602 2547 memset(mapinfo, 0, sizeof(FileMapInfo));
coleenp@3602 2548
coleenp@3602 2549 // Open the shared archive file, read and validate the header. If
coleenp@3602 2550 // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@3602 2551 // disabled and the file is closed.
coleenp@3602 2552 // Map in spaces now also
coleenp@3602 2553 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
coleenp@3602 2554 FileMapInfo::set_current_info(mapinfo);
coleenp@3602 2555 } else {
coleenp@3602 2556 assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@3602 2557 "archive file not closed or shared spaces not disabled.");
coleenp@3602 2558 }
coleenp@3602 2559 }
coleenp@3602 2560
jmasa@3947 2561 // Initialize these before initializing the VirtualSpaceList
coleenp@3602 2562 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@3947 2563 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@3947 2564 // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@3947 2565 // on the medium chunk list. The next chunk will be small and progress
jmasa@3947 2566 // from there. This size calculated by -version.
jmasa@3947 2567 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
jmasa@3947 2568 (ClassMetaspaceSize/BytesPerWord)*2);
jmasa@3947 2569 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@3602 2570 // Arbitrarily set the initial virtual space to a multiple
coleenp@3602 2571 // of the boot class loader size.
jmasa@3947 2572 size_t word_size = VIRTUALSPACEMULTIPLIER * first_chunk_word_size();
coleenp@3602 2573 // Initialize the list of virtual spaces.
coleenp@3602 2574 _space_list = new VirtualSpaceList(word_size);
coleenp@3602 2575 }
coleenp@3602 2576 }
coleenp@3602 2577
coleenp@3602 2578 // For UseCompressedKlassPointers the class space is reserved as a piece of the
coleenp@3602 2579 // Java heap because the compression algorithm is the same for each. The
coleenp@3602 2580 // argument passed in is at the top of the compressed space
coleenp@3602 2581 void Metaspace::initialize_class_space(ReservedSpace rs) {
coleenp@3602 2582 // The reserved space size may be bigger because of alignment, esp with UseLargePages
mikael@4113 2583 assert(rs.size() >= ClassMetaspaceSize,
mikael@4113 2584 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), ClassMetaspaceSize));
coleenp@3602 2585 _class_space_list = new VirtualSpaceList(rs);
coleenp@3602 2586 }
coleenp@3602 2587
jmasa@3947 2588 void Metaspace::initialize(Mutex* lock,
jmasa@3947 2589 MetaspaceType type) {
coleenp@3602 2590
coleenp@3602 2591 assert(space_list() != NULL,
coleenp@3602 2592 "Metadata VirtualSpaceList has not been initialized");
coleenp@3602 2593
coleenp@3602 2594 _vsm = new SpaceManager(lock, space_list());
coleenp@3602 2595 if (_vsm == NULL) {
coleenp@3602 2596 return;
coleenp@3602 2597 }
jmasa@3947 2598 size_t word_size;
jmasa@3947 2599 size_t class_word_size;
jmasa@3947 2600 vsm()->get_initial_chunk_sizes(type,
jmasa@3947 2601 &word_size,
jmasa@3947 2602 &class_word_size);
coleenp@3602 2603
coleenp@3602 2604 assert(class_space_list() != NULL,
coleenp@3602 2605 "Class VirtualSpaceList has not been initialized");
coleenp@3602 2606
coleenp@3602 2607 // Allocate SpaceManager for classes.
coleenp@3602 2608 _class_vsm = new SpaceManager(lock, class_space_list());
coleenp@3602 2609 if (_class_vsm == NULL) {
coleenp@3602 2610 return;
coleenp@3602 2611 }
coleenp@3602 2612
coleenp@3602 2613 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@3602 2614
coleenp@3602 2615 // Allocate chunk for metadata objects
coleenp@3602 2616 Metachunk* new_chunk =
jmasa@3947 2617 space_list()->get_initialization_chunk(word_size,
jmasa@3947 2618 vsm()->medium_chunk_bunch());
coleenp@3602 2619 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@3602 2620 if (new_chunk != NULL) {
coleenp@3602 2621 // Add to this manager's list of chunks in use and current_chunk().
coleenp@3602 2622 vsm()->add_chunk(new_chunk, true);
coleenp@3602 2623 }
coleenp@3602 2624
coleenp@3602 2625 // Allocate chunk for class metadata objects
coleenp@3602 2626 Metachunk* class_chunk =
jmasa@3947 2627 class_space_list()->get_initialization_chunk(class_word_size,
jmasa@3947 2628 class_vsm()->medium_chunk_bunch());
coleenp@3602 2629 if (class_chunk != NULL) {
coleenp@3602 2630 class_vsm()->add_chunk(class_chunk, true);
coleenp@3602 2631 }
coleenp@3602 2632 }
coleenp@3602 2633
jmasa@3947 2634 size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@3947 2635 size_t byte_size = word_size * wordSize;
jmasa@3947 2636 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@3947 2637 }
jmasa@3947 2638
coleenp@3602 2639 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@3602 2640 // DumpSharedSpaces doesn't use class metadata area (yet)
coleenp@3602 2641 if (mdtype == ClassType && !DumpSharedSpaces) {
jmasa@3761 2642 return class_vsm()->allocate(word_size);
coleenp@3602 2643 } else {
jmasa@3761 2644 return vsm()->allocate(word_size);
coleenp@3602 2645 }
coleenp@3602 2646 }
coleenp@3602 2647
jmasa@3629 2648 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
jmasa@3629 2649 MetaWord* result;
jmasa@3629 2650 MetaspaceGC::set_expand_after_GC(true);
jmasa@3629 2651 size_t before_inc = MetaspaceGC::capacity_until_GC();
jmasa@3629 2652 size_t delta_words = MetaspaceGC::delta_capacity_until_GC(word_size);
jmasa@3629 2653 MetaspaceGC::inc_capacity_until_GC(delta_words);
jmasa@3629 2654 if (PrintGCDetails && Verbose) {
jmasa@3629 2655 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
jmasa@3629 2656 " to " SIZE_FORMAT, before_inc, MetaspaceGC::capacity_until_GC());
jmasa@3629 2657 }
jmasa@3761 2658
jmasa@3629 2659 result = allocate(word_size, mdtype);
jmasa@3629 2660
jmasa@3629 2661 return result;
jmasa@3629 2662 }
jmasa@3629 2663
coleenp@3602 2664 // Space allocated in the Metaspace. This may
coleenp@3602 2665 // be across several metadata virtual spaces.
coleenp@3602 2666 char* Metaspace::bottom() const {
coleenp@3602 2667 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@3602 2668 return (char*)vsm()->current_chunk()->bottom();
coleenp@3602 2669 }
coleenp@3602 2670
coleenp@3602 2671 size_t Metaspace::used_words(MetadataType mdtype) const {
coleenp@3602 2672 // return vsm()->allocation_total();
coleenp@3602 2673 return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
coleenp@3602 2674 vsm()->sum_used_in_chunks_in_use(); // includes overhead!
coleenp@3602 2675 }
coleenp@3602 2676
coleenp@3602 2677 size_t Metaspace::free_words(MetadataType mdtype) const {
coleenp@3602 2678 return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
coleenp@3602 2679 vsm()->sum_free_in_chunks_in_use();
coleenp@3602 2680 }
coleenp@3602 2681
coleenp@3602 2682 // Space capacity in the Metaspace. It includes
coleenp@3602 2683 // space in the list of chunks from which allocations
coleenp@3602 2684 // have been made. Don't include space in the global freelist and
coleenp@3602 2685 // in the space available in the dictionary which
coleenp@3602 2686 // is already counted in some chunk.
coleenp@3602 2687 size_t Metaspace::capacity_words(MetadataType mdtype) const {
coleenp@3602 2688 return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
coleenp@3602 2689 vsm()->sum_capacity_in_chunks_in_use();
coleenp@3602 2690 }
coleenp@3602 2691
coleenp@3602 2692 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@3602 2693 if (SafepointSynchronize::is_at_safepoint()) {
coleenp@3602 2694 assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@3761 2695 // Don't take Heap_lock
jmasa@3761 2696 MutexLocker ml(vsm()->lock());
jmasa@3761 2697 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2698 // Dark matter. Too small for dictionary.
jmasa@3761 2699 #ifdef ASSERT
jmasa@3761 2700 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2701 #endif
jmasa@3761 2702 return;
jmasa@3761 2703 }
coleenp@3602 2704 if (is_class) {
jmasa@3761 2705 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2706 } else {
jmasa@3761 2707 vsm()->deallocate(ptr, word_size);
coleenp@3602 2708 }
coleenp@3602 2709 } else {
coleenp@3602 2710 MutexLocker ml(vsm()->lock());
coleenp@3602 2711
jmasa@3761 2712 if (word_size < TreeChunk<Metablock, FreeList>::min_size()) {
jmasa@3761 2713 // Dark matter. Too small for dictionary.
jmasa@3761 2714 #ifdef ASSERT
jmasa@3761 2715 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@3761 2716 #endif
jmasa@3761 2717 return;
jmasa@3761 2718 }
coleenp@3602 2719 if (is_class) {
jmasa@3761 2720 class_vsm()->deallocate(ptr, word_size);
coleenp@3602 2721 } else {
jmasa@3761 2722 vsm()->deallocate(ptr, word_size);
coleenp@3602 2723 }
coleenp@3602 2724 }
coleenp@3602 2725 }
coleenp@3602 2726
jmasa@3761 2727 Metablock* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
coleenp@3602 2728 bool read_only, MetadataType mdtype, TRAPS) {
coleenp@3602 2729 if (HAS_PENDING_EXCEPTION) {
coleenp@3602 2730 assert(false, "Should not allocate with exception pending");
coleenp@3602 2731 return NULL; // caller does a CHECK_NULL too
coleenp@3602 2732 }
coleenp@3602 2733
coleenp@3602 2734 // SSS: Should we align the allocations and make sure the sizes are aligned.
coleenp@3602 2735 MetaWord* result = NULL;
coleenp@3602 2736
coleenp@3602 2737 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@3602 2738 "ClassLoaderData::the_null_class_loader_data() should have been used.");
coleenp@3602 2739 // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@3602 2740 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
coleenp@3602 2741 // to revisit this for application class data sharing.
coleenp@3602 2742 if (DumpSharedSpaces) {
coleenp@3602 2743 if (read_only) {
coleenp@3602 2744 result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2745 } else {
coleenp@3602 2746 result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
coleenp@3602 2747 }
coleenp@3602 2748 if (result == NULL) {
coleenp@3602 2749 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@3602 2750 }
jmasa@3761 2751 return Metablock::initialize(result, word_size);
coleenp@3602 2752 }
coleenp@3602 2753
coleenp@3602 2754 result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@3602 2755
coleenp@3602 2756 if (result == NULL) {
coleenp@3602 2757 // Try to clean out some memory and retry.
coleenp@3602 2758 result =
jmasa@3761 2759 Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
coleenp@3602 2760 loader_data, word_size, mdtype);
coleenp@3602 2761
coleenp@3602 2762 // If result is still null, we are out of memory.
coleenp@3602 2763 if (result == NULL) {
jmasa@3947 2764 if (Verbose && TraceMetadataChunkAllocation) {
jmasa@3947 2765 gclog_or_tty->print_cr("Metaspace allocation failed for size "
jmasa@3947 2766 SIZE_FORMAT, word_size);
jmasa@3947 2767 if (loader_data->metaspace_or_null() != NULL) loader_data->metaspace_or_null()->dump(gclog_or_tty);
jmasa@3947 2768 MetaspaceAux::dump(gclog_or_tty);
jmasa@3947 2769 }
coleenp@3602 2770 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
coleenp@3602 2771 report_java_out_of_memory("Metadata space");
coleenp@3602 2772
coleenp@3602 2773 if (JvmtiExport::should_post_resource_exhausted()) {
coleenp@3602 2774 JvmtiExport::post_resource_exhausted(
coleenp@3602 2775 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
coleenp@3602 2776 "Metadata space");
coleenp@3602 2777 }
coleenp@3602 2778 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
coleenp@3602 2779 }
coleenp@3602 2780 }
jmasa@3761 2781 return Metablock::initialize(result, word_size);
coleenp@3602 2782 }
coleenp@3602 2783
coleenp@3602 2784 void Metaspace::print_on(outputStream* out) const {
coleenp@3602 2785 // Print both class virtual space counts and metaspace.
coleenp@3602 2786 if (Verbose) {
coleenp@3602 2787 vsm()->print_on(out);
coleenp@3602 2788 class_vsm()->print_on(out);
coleenp@3602 2789 }
coleenp@3602 2790 }
coleenp@3602 2791
coleenp@3860 2792 bool Metaspace::contains(const void * ptr) {
coleenp@3602 2793 if (MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@3602 2794 return true;
coleenp@3602 2795 }
coleenp@3860 2796 // This is checked while unlocked. As long as the virtualspaces are added
coleenp@3860 2797 // at the end, the pointer will be in one of them. The virtual spaces
coleenp@3860 2798 // aren't deleted presently. When they are, some sort of locking might
coleenp@3860 2799 // be needed. Note, locking this can cause inversion problems with the
coleenp@3860 2800 // caller in MetaspaceObj::is_metadata() function.
coleenp@3602 2801 return space_list()->contains(ptr) || class_space_list()->contains(ptr);
coleenp@3602 2802 }
coleenp@3602 2803
coleenp@3602 2804 void Metaspace::verify() {
coleenp@3602 2805 vsm()->verify();
coleenp@3602 2806 class_vsm()->verify();
coleenp@3602 2807 }
coleenp@3602 2808
coleenp@3602 2809 void Metaspace::dump(outputStream* const out) const {
coleenp@3602 2810 if (UseMallocOnly) {
coleenp@3602 2811 // Just print usage for now
coleenp@3602 2812 out->print_cr("usage %d", used_words(Metaspace::NonClassType));
coleenp@3602 2813 }
coleenp@3602 2814 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@3602 2815 vsm()->dump(out);
coleenp@3602 2816 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
coleenp@3602 2817 class_vsm()->dump(out);
coleenp@3602 2818 }