Sat, 01 Sep 2012 13:25:18 -0400
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
coleenp@4037 | 1 | /* |
coleenp@4037 | 2 | * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
coleenp@4037 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
coleenp@4037 | 4 | * |
coleenp@4037 | 5 | * This code is free software; you can redistribute it and/or modify it |
coleenp@4037 | 6 | * under the terms of the GNU General Public License version 2 only, as |
coleenp@4037 | 7 | * published by the Free Software Foundation. |
coleenp@4037 | 8 | * |
coleenp@4037 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
coleenp@4037 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
coleenp@4037 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
coleenp@4037 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
coleenp@4037 | 13 | * accompanied this code). |
coleenp@4037 | 14 | * |
coleenp@4037 | 15 | * You should have received a copy of the GNU General Public License version |
coleenp@4037 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
coleenp@4037 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
coleenp@4037 | 18 | * |
coleenp@4037 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
coleenp@4037 | 20 | * or visit www.oracle.com if you need additional information or have any |
coleenp@4037 | 21 | * questions. |
coleenp@4037 | 22 | * |
coleenp@4037 | 23 | */ |
coleenp@4037 | 24 | #include "precompiled.hpp" |
coleenp@4037 | 25 | #include "gc_interface/collectedHeap.hpp" |
coleenp@4037 | 26 | #include "memory/binaryTreeDictionary.hpp" |
coleenp@4037 | 27 | #include "memory/collectorPolicy.hpp" |
coleenp@4037 | 28 | #include "memory/filemap.hpp" |
coleenp@4037 | 29 | #include "memory/freeList.hpp" |
coleenp@4037 | 30 | #include "memory/metaspace.hpp" |
coleenp@4037 | 31 | #include "memory/metaspaceShared.hpp" |
coleenp@4037 | 32 | #include "memory/resourceArea.hpp" |
coleenp@4037 | 33 | #include "memory/universe.hpp" |
coleenp@4037 | 34 | #include "runtime/globals.hpp" |
coleenp@4037 | 35 | #include "runtime/mutex.hpp" |
coleenp@4037 | 36 | #include "services/memTracker.hpp" |
coleenp@4037 | 37 | #include "utilities/copy.hpp" |
coleenp@4037 | 38 | #include "utilities/debug.hpp" |
coleenp@4037 | 39 | |
coleenp@4037 | 40 | // Define this macro to deallocate Metablock. If not defined, |
coleenp@4037 | 41 | // blocks are not yet deallocated and are only mangled. |
coleenp@4037 | 42 | #undef DEALLOCATE_BLOCKS |
coleenp@4037 | 43 | |
coleenp@4037 | 44 | // Easily recognizable patterns |
coleenp@4037 | 45 | // These patterns can be the same in 32bit or 64bit since |
coleenp@4037 | 46 | // they only have to be easily recognizable. |
coleenp@4037 | 47 | const void* metaspace_allocation_leader = (void*) 0X11111111; |
coleenp@4037 | 48 | const void* metaspace_allocation_trailer = (void*) 0X77777777; |
coleenp@4037 | 49 | |
coleenp@4037 | 50 | // Parameters for stress mode testing |
coleenp@4037 | 51 | const uint metadata_deallocate_a_lot_block = 10; |
coleenp@4037 | 52 | const uint metadata_deallocate_a_lock_chunk = 3; |
coleenp@4037 | 53 | size_t const allocation_from_dictionary_limit = 64 * K; |
coleenp@4037 | 54 | const size_t metadata_chunk_initialize = 0xf7f7f7f7; |
coleenp@4037 | 55 | const size_t metadata_deallocate = 0xf5f5f5f5; |
coleenp@4037 | 56 | const size_t metadata_space_manager_allocate = 0xf3f3f3f3; |
coleenp@4037 | 57 | |
coleenp@4037 | 58 | MetaWord* last_allocated = 0; |
coleenp@4037 | 59 | |
coleenp@4037 | 60 | // Used in declarations in SpaceManager and ChunkManager |
coleenp@4037 | 61 | enum ChunkIndex { |
coleenp@4037 | 62 | SmallIndex = 0, |
coleenp@4037 | 63 | MediumIndex = 1, |
coleenp@4037 | 64 | HumongousIndex = 2, |
coleenp@4037 | 65 | NumberOfFreeLists = 3 |
coleenp@4037 | 66 | }; |
coleenp@4037 | 67 | |
coleenp@4037 | 68 | static ChunkIndex next_chunk_index(ChunkIndex i) { |
coleenp@4037 | 69 | assert(i < NumberOfFreeLists, "Out of bound"); |
coleenp@4037 | 70 | return (ChunkIndex) (i+1); |
coleenp@4037 | 71 | } |
coleenp@4037 | 72 | |
coleenp@4037 | 73 | // Originally _capacity_until_GC was set to MetaspaceSize here but |
coleenp@4037 | 74 | // the default MetaspaceSize before argument processing was being |
coleenp@4037 | 75 | // used which was not the desired value. See the code |
coleenp@4037 | 76 | // in should_expand() to see how the initialization is handled |
coleenp@4037 | 77 | // now. |
coleenp@4037 | 78 | size_t MetaspaceGC::_capacity_until_GC = 0; |
coleenp@4037 | 79 | bool MetaspaceGC::_expand_after_GC = false; |
coleenp@4037 | 80 | uint MetaspaceGC::_shrink_factor = 0; |
coleenp@4037 | 81 | bool MetaspaceGC::_should_concurrent_collect = false; |
coleenp@4037 | 82 | |
coleenp@4037 | 83 | // Blocks of space for metadata are allocated out of Metachunks. |
coleenp@4037 | 84 | // |
coleenp@4037 | 85 | // Metachunk are allocated out of MetadataVirtualspaces and once |
coleenp@4037 | 86 | // allocated there is no explicit link between a Metachunk and |
coleenp@4037 | 87 | // the MetadataVirtualspaces from which it was allocated. |
coleenp@4037 | 88 | // |
coleenp@4037 | 89 | // Each SpaceManager maintains a |
coleenp@4037 | 90 | // list of the chunks it is using and the current chunk. The current |
coleenp@4037 | 91 | // chunk is the chunk from which allocations are done. Space freed in |
coleenp@4037 | 92 | // a chunk is placed on the free list of blocks (BlockFreelist) and |
coleenp@4037 | 93 | // reused from there. |
coleenp@4037 | 94 | // |
coleenp@4037 | 95 | // Future modification |
coleenp@4037 | 96 | // |
coleenp@4037 | 97 | // The Metachunk can conceivable be replaced by the Chunk in |
coleenp@4037 | 98 | // allocation.hpp. Note that the latter Chunk is the space for |
coleenp@4037 | 99 | // allocation (allocations from the chunk are out of the space in |
coleenp@4037 | 100 | // the Chunk after the header for the Chunk) where as Metachunks |
coleenp@4037 | 101 | // point to space in a VirtualSpace. To replace Metachunks with |
coleenp@4037 | 102 | // Chunks, change Chunks so that they can be allocated out of a VirtualSpace. |
coleenp@4037 | 103 | // |
coleenp@4037 | 104 | |
coleenp@4037 | 105 | // Metablock are the unit of allocation from a Chunk. It contains |
coleenp@4037 | 106 | // the size of the requested allocation in a debug build. |
coleenp@4037 | 107 | // Also in a debug build it has a marker before and after the |
coleenp@4037 | 108 | // body of the block. The address of the body is the address returned |
coleenp@4037 | 109 | // by the allocation. |
coleenp@4037 | 110 | // |
coleenp@4037 | 111 | // Layout in a debug build. In a product build only the body is present. |
coleenp@4037 | 112 | // |
coleenp@4037 | 113 | // +-----------+-----------+------------+ +-----------+ |
coleenp@4037 | 114 | // | word size | leader | body | ... | trailer | |
coleenp@4037 | 115 | // +-----------+-----------+------------+ +-----------+ |
coleenp@4037 | 116 | // |
coleenp@4037 | 117 | // A Metablock may be reused by its SpaceManager but are never moved between |
coleenp@4037 | 118 | // SpaceManagers. There is no explicit link to the Metachunk |
coleenp@4037 | 119 | // from which it was allocated. Metablock are not deallocated, rather |
coleenp@4037 | 120 | // the Metachunk it is a part of will be deallocated when it's |
coleenp@4037 | 121 | // associated class loader is collected. |
coleenp@4037 | 122 | // |
coleenp@4037 | 123 | // When the word size of a block is passed in to the deallocation |
coleenp@4037 | 124 | // call the word size no longer needs to be part of a Metablock. |
coleenp@4037 | 125 | |
coleenp@4037 | 126 | class Metablock { |
coleenp@4037 | 127 | friend class VMStructs; |
coleenp@4037 | 128 | private: |
coleenp@4037 | 129 | // Used to align the allocation (see below) and for debugging. |
coleenp@4037 | 130 | #ifdef ASSERT |
coleenp@4037 | 131 | struct { |
coleenp@4037 | 132 | size_t _word_size; |
coleenp@4037 | 133 | void* _leader; |
coleenp@4037 | 134 | } _header; |
coleenp@4037 | 135 | void* _data[1]; |
coleenp@4037 | 136 | #endif |
coleenp@4037 | 137 | static size_t _overhead; |
coleenp@4037 | 138 | |
coleenp@4037 | 139 | #ifdef ASSERT |
coleenp@4037 | 140 | void set_word_size(size_t v) { _header._word_size = v; } |
coleenp@4037 | 141 | void* leader() { return _header._leader; } |
coleenp@4037 | 142 | void* trailer() { |
coleenp@4037 | 143 | jlong index = (jlong) _header._word_size - sizeof(_header)/BytesPerWord - 1; |
coleenp@4037 | 144 | assert(index > 0, err_msg("Bad indexling of trailer %d", index)); |
coleenp@4037 | 145 | void** ptr = &_data[index]; |
coleenp@4037 | 146 | return *ptr; |
coleenp@4037 | 147 | } |
coleenp@4037 | 148 | void set_leader(void* v) { _header._leader = v; } |
coleenp@4037 | 149 | void set_trailer(void* v) { |
coleenp@4037 | 150 | void** ptr = &_data[_header._word_size - sizeof(_header)/BytesPerWord - 1]; |
coleenp@4037 | 151 | *ptr = v; |
coleenp@4037 | 152 | } |
coleenp@4037 | 153 | public: |
coleenp@4037 | 154 | size_t word_size() { return _header._word_size; } |
coleenp@4037 | 155 | #endif |
coleenp@4037 | 156 | public: |
coleenp@4037 | 157 | |
coleenp@4037 | 158 | static Metablock* initialize(MetaWord* p, size_t word_size); |
coleenp@4037 | 159 | |
coleenp@4037 | 160 | // This places the body of the block at a 2 word boundary |
coleenp@4037 | 161 | // because every block starts on a 2 word boundary. Work out |
coleenp@4037 | 162 | // how to make the body on a 2 word boundary if the block |
coleenp@4037 | 163 | // starts on a arbitrary boundary. JJJ |
coleenp@4037 | 164 | |
coleenp@4037 | 165 | #ifdef ASSERT |
coleenp@4037 | 166 | MetaWord* data() { return (MetaWord*) &_data[0]; } |
coleenp@4037 | 167 | #else |
coleenp@4037 | 168 | MetaWord* data() { return (MetaWord*) this; } |
coleenp@4037 | 169 | #endif |
coleenp@4037 | 170 | static Metablock* metablock_from_data(MetaWord* p) { |
coleenp@4037 | 171 | #ifdef ASSERT |
coleenp@4037 | 172 | size_t word_offset = offset_of(Metablock, _data)/BytesPerWord; |
coleenp@4037 | 173 | Metablock* result = (Metablock*) (p - word_offset); |
coleenp@4037 | 174 | return result; |
coleenp@4037 | 175 | #else |
coleenp@4037 | 176 | return (Metablock*) p; |
coleenp@4037 | 177 | #endif |
coleenp@4037 | 178 | } |
coleenp@4037 | 179 | |
coleenp@4037 | 180 | static size_t overhead() { return _overhead; } |
coleenp@4037 | 181 | void verify(); |
coleenp@4037 | 182 | }; |
coleenp@4037 | 183 | |
coleenp@4037 | 184 | // Metachunk - Quantum of allocation from a Virtualspace |
coleenp@4037 | 185 | // Metachunks are reused (when freed are put on a global freelist) and |
coleenp@4037 | 186 | // have no permanent association to a SpaceManager. |
coleenp@4037 | 187 | |
coleenp@4037 | 188 | // +--------------+ <- end |
coleenp@4037 | 189 | // | | --+ ---+ |
coleenp@4037 | 190 | // | | | free | |
coleenp@4037 | 191 | // | | | | |
coleenp@4037 | 192 | // | | | | capacity |
coleenp@4037 | 193 | // | | | | |
coleenp@4037 | 194 | // | | <- top --+ | |
coleenp@4037 | 195 | // | | ---+ | |
coleenp@4037 | 196 | // | | | used | |
coleenp@4037 | 197 | // | | | | |
coleenp@4037 | 198 | // | | | | |
coleenp@4037 | 199 | // +--------------+ <- bottom ---+ ---+ |
coleenp@4037 | 200 | |
coleenp@4037 | 201 | class Metachunk VALUE_OBJ_CLASS_SPEC { |
coleenp@4037 | 202 | // link to support lists of chunks |
coleenp@4037 | 203 | Metachunk* _next; |
coleenp@4037 | 204 | |
coleenp@4037 | 205 | MetaWord* _bottom; |
coleenp@4037 | 206 | MetaWord* _end; |
coleenp@4037 | 207 | MetaWord* _top; |
coleenp@4037 | 208 | size_t _word_size; |
coleenp@4037 | 209 | |
coleenp@4037 | 210 | // Metachunks are allocated out of a MetadataVirtualSpace and |
coleenp@4037 | 211 | // and use some of its space to describe itself (plus alignment |
coleenp@4037 | 212 | // considerations). Metadata is allocated in the rest of the chunk. |
coleenp@4037 | 213 | // This size is the overhead of maintaining the Metachunk within |
coleenp@4037 | 214 | // the space. |
coleenp@4037 | 215 | static size_t _overhead; |
coleenp@4037 | 216 | |
coleenp@4037 | 217 | void set_bottom(MetaWord* v) { _bottom = v; } |
coleenp@4037 | 218 | void set_end(MetaWord* v) { _end = v; } |
coleenp@4037 | 219 | void set_top(MetaWord* v) { _top = v; } |
coleenp@4037 | 220 | void set_word_size(size_t v) { _word_size = v; } |
coleenp@4037 | 221 | public: |
coleenp@4037 | 222 | |
coleenp@4037 | 223 | // Used to add a Metachunk to a list of Metachunks |
coleenp@4037 | 224 | void set_next(Metachunk* v) { _next = v; assert(v != this, "Boom");} |
coleenp@4037 | 225 | |
coleenp@4037 | 226 | Metablock* allocate(size_t word_size); |
coleenp@4037 | 227 | static Metachunk* initialize(MetaWord* ptr, size_t word_size); |
coleenp@4037 | 228 | |
coleenp@4037 | 229 | // Accessors |
coleenp@4037 | 230 | Metachunk* next() const { return _next; } |
coleenp@4037 | 231 | MetaWord* bottom() const { return _bottom; } |
coleenp@4037 | 232 | MetaWord* end() const { return _end; } |
coleenp@4037 | 233 | MetaWord* top() const { return _top; } |
coleenp@4037 | 234 | size_t word_size() const { return _word_size; } |
coleenp@4037 | 235 | static size_t overhead() { return _overhead; } |
coleenp@4037 | 236 | |
coleenp@4037 | 237 | // Reset top to bottom so chunk can be reused. |
coleenp@4037 | 238 | void reset_empty() { _top = (_bottom + _overhead); } |
coleenp@4037 | 239 | bool is_empty() { return _top == (_bottom + _overhead); } |
coleenp@4037 | 240 | |
coleenp@4037 | 241 | // used (has been allocated) |
coleenp@4037 | 242 | // free (available for future allocations) |
coleenp@4037 | 243 | // capacity (total size of chunk) |
coleenp@4037 | 244 | size_t used_word_size(); |
coleenp@4037 | 245 | size_t free_word_size(); |
coleenp@4037 | 246 | size_t capacity_word_size(); |
coleenp@4037 | 247 | |
coleenp@4037 | 248 | #ifdef ASSERT |
coleenp@4037 | 249 | void mangle() { |
coleenp@4037 | 250 | // Mangle the payload of the chunk and not the links that |
coleenp@4037 | 251 | // maintain list of chunks. |
coleenp@4037 | 252 | HeapWord* start = (HeapWord*)(bottom() + overhead()); |
coleenp@4037 | 253 | size_t word_size = capacity_word_size() - overhead(); |
coleenp@4037 | 254 | Copy::fill_to_words(start, word_size, metadata_chunk_initialize); |
coleenp@4037 | 255 | } |
coleenp@4037 | 256 | #endif // ASSERT |
coleenp@4037 | 257 | |
coleenp@4037 | 258 | void print_on(outputStream* st) const; |
coleenp@4037 | 259 | void verify(); |
coleenp@4037 | 260 | }; |
coleenp@4037 | 261 | |
coleenp@4037 | 262 | |
coleenp@4037 | 263 | // Pointer to list of Metachunks. |
coleenp@4037 | 264 | class ChunkList VALUE_OBJ_CLASS_SPEC { |
coleenp@4037 | 265 | // List of free chunks |
coleenp@4037 | 266 | Metachunk* _head; |
coleenp@4037 | 267 | |
coleenp@4037 | 268 | public: |
coleenp@4037 | 269 | // Constructor |
coleenp@4037 | 270 | ChunkList() : _head(NULL) {} |
coleenp@4037 | 271 | |
coleenp@4037 | 272 | // Accessors |
coleenp@4037 | 273 | Metachunk* head() { return _head; } |
coleenp@4037 | 274 | void set_head(Metachunk* v) { _head = v; } |
coleenp@4037 | 275 | |
coleenp@4037 | 276 | // Link at head of the list |
coleenp@4037 | 277 | void add_at_head(Metachunk* head, Metachunk* tail); |
coleenp@4037 | 278 | void add_at_head(Metachunk* head); |
coleenp@4037 | 279 | |
coleenp@4037 | 280 | size_t sum_list_size(); |
coleenp@4037 | 281 | size_t sum_list_count(); |
coleenp@4037 | 282 | size_t sum_list_capacity(); |
coleenp@4037 | 283 | }; |
coleenp@4037 | 284 | |
coleenp@4037 | 285 | // Manages the global free lists of chunks. |
coleenp@4037 | 286 | // Has three lists of free chunks, and a total size and |
coleenp@4037 | 287 | // count that includes all three |
coleenp@4037 | 288 | |
coleenp@4037 | 289 | class ChunkManager VALUE_OBJ_CLASS_SPEC { |
coleenp@4037 | 290 | |
coleenp@4037 | 291 | // Free list of chunks of different sizes. |
coleenp@4037 | 292 | // SmallChunk |
coleenp@4037 | 293 | // MediumChunk |
coleenp@4037 | 294 | // HumongousChunk |
coleenp@4037 | 295 | ChunkList _free_chunks[3]; |
coleenp@4037 | 296 | |
coleenp@4037 | 297 | // ChunkManager in all lists of this type |
coleenp@4037 | 298 | size_t _free_chunks_total; |
coleenp@4037 | 299 | size_t _free_chunks_count; |
coleenp@4037 | 300 | |
coleenp@4037 | 301 | void dec_free_chunks_total(size_t v) { |
coleenp@4037 | 302 | assert(_free_chunks_count > 0 && |
coleenp@4037 | 303 | _free_chunks_total > 0, |
coleenp@4037 | 304 | "About to go negative"); |
coleenp@4037 | 305 | Atomic::add_ptr(-1, &_free_chunks_count); |
coleenp@4037 | 306 | jlong minus_v = (jlong) - (jlong) v; |
coleenp@4037 | 307 | Atomic::add_ptr(minus_v, &_free_chunks_total); |
coleenp@4037 | 308 | } |
coleenp@4037 | 309 | |
coleenp@4037 | 310 | // Debug support |
coleenp@4037 | 311 | |
coleenp@4037 | 312 | size_t sum_free_chunks(); |
coleenp@4037 | 313 | size_t sum_free_chunks_count(); |
coleenp@4037 | 314 | |
coleenp@4037 | 315 | void locked_verify_free_chunks_total(); |
coleenp@4037 | 316 | void locked_verify_free_chunks_count(); |
coleenp@4037 | 317 | void verify_free_chunks_count(); |
coleenp@4037 | 318 | |
coleenp@4037 | 319 | public: |
coleenp@4037 | 320 | |
coleenp@4037 | 321 | ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {} |
coleenp@4037 | 322 | |
coleenp@4037 | 323 | // add or delete (return) a chunk to the global freelist. |
coleenp@4037 | 324 | Metachunk* chunk_freelist_allocate(size_t word_size); |
coleenp@4037 | 325 | void chunk_freelist_deallocate(Metachunk* chunk); |
coleenp@4037 | 326 | |
coleenp@4037 | 327 | // Total of the space in the free chunks list |
coleenp@4037 | 328 | size_t free_chunks_total(); |
coleenp@4037 | 329 | size_t free_chunks_total_in_bytes(); |
coleenp@4037 | 330 | |
coleenp@4037 | 331 | // Number of chunks in the free chunks list |
coleenp@4037 | 332 | size_t free_chunks_count(); |
coleenp@4037 | 333 | |
coleenp@4037 | 334 | void inc_free_chunks_total(size_t v, size_t count = 1) { |
coleenp@4037 | 335 | Atomic::add_ptr(count, &_free_chunks_count); |
coleenp@4037 | 336 | Atomic::add_ptr(v, &_free_chunks_total); |
coleenp@4037 | 337 | } |
coleenp@4037 | 338 | ChunkList* free_medium_chunks() { return &_free_chunks[1]; } |
coleenp@4037 | 339 | ChunkList* free_small_chunks() { return &_free_chunks[0]; } |
coleenp@4037 | 340 | ChunkList* free_humongous_chunks() { return &_free_chunks[2]; } |
coleenp@4037 | 341 | |
coleenp@4037 | 342 | ChunkList* free_chunks(ChunkIndex index); |
coleenp@4037 | 343 | |
coleenp@4037 | 344 | // Returns the list for the given chunk word size. |
coleenp@4037 | 345 | ChunkList* find_free_chunks_list(size_t word_size); |
coleenp@4037 | 346 | |
coleenp@4037 | 347 | // Add and remove from a list by size. Selects |
coleenp@4037 | 348 | // list based on size of chunk. |
coleenp@4037 | 349 | void free_chunks_put(Metachunk* chuck); |
coleenp@4037 | 350 | Metachunk* free_chunks_get(size_t chunk_word_size); |
coleenp@4037 | 351 | |
coleenp@4037 | 352 | // Debug support |
coleenp@4037 | 353 | void verify(); |
coleenp@4037 | 354 | void locked_verify(); |
coleenp@4037 | 355 | void verify_free_chunks_total(); |
coleenp@4037 | 356 | |
coleenp@4037 | 357 | void locked_print_free_chunks(outputStream* st); |
coleenp@4037 | 358 | void locked_print_sum_free_chunks(outputStream* st); |
coleenp@4037 | 359 | }; |
coleenp@4037 | 360 | |
coleenp@4037 | 361 | |
coleenp@4037 | 362 | // Used to manage the free list of Metablocks (a block corresponds |
coleenp@4037 | 363 | // to the allocation of a quantum of metadata). |
coleenp@4037 | 364 | class BlockFreelist VALUE_OBJ_CLASS_SPEC { |
coleenp@4037 | 365 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 366 | BinaryTreeDictionary<Metablock>* _dictionary; |
coleenp@4037 | 367 | #endif |
coleenp@4037 | 368 | static Metablock* initialize_free_chunk(Metablock* block, size_t word_size); |
coleenp@4037 | 369 | |
coleenp@4037 | 370 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 371 | // Accessors |
coleenp@4037 | 372 | BinaryTreeDictionary<Metablock>* dictionary() const { return _dictionary; } |
coleenp@4037 | 373 | #endif |
coleenp@4037 | 374 | |
coleenp@4037 | 375 | public: |
coleenp@4037 | 376 | BlockFreelist(); |
coleenp@4037 | 377 | ~BlockFreelist(); |
coleenp@4037 | 378 | |
coleenp@4037 | 379 | // Get and return a block to the free list |
coleenp@4037 | 380 | Metablock* get_block(size_t word_size); |
coleenp@4037 | 381 | void return_block(Metablock* block, size_t word_size); |
coleenp@4037 | 382 | |
coleenp@4037 | 383 | size_t totalSize() { |
coleenp@4037 | 384 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 385 | if (dictionary() == NULL) { |
coleenp@4037 | 386 | return 0; |
coleenp@4037 | 387 | } else { |
coleenp@4037 | 388 | return dictionary()->totalSize(); |
coleenp@4037 | 389 | } |
coleenp@4037 | 390 | #else |
coleenp@4037 | 391 | return 0; |
coleenp@4037 | 392 | #endif |
coleenp@4037 | 393 | } |
coleenp@4037 | 394 | |
coleenp@4037 | 395 | void print_on(outputStream* st) const; |
coleenp@4037 | 396 | }; |
coleenp@4037 | 397 | |
coleenp@4037 | 398 | class VirtualSpaceNode : public CHeapObj<mtClass> { |
coleenp@4037 | 399 | friend class VirtualSpaceList; |
coleenp@4037 | 400 | |
coleenp@4037 | 401 | // Link to next VirtualSpaceNode |
coleenp@4037 | 402 | VirtualSpaceNode* _next; |
coleenp@4037 | 403 | |
coleenp@4037 | 404 | // total in the VirtualSpace |
coleenp@4037 | 405 | MemRegion _reserved; |
coleenp@4037 | 406 | ReservedSpace _rs; |
coleenp@4037 | 407 | VirtualSpace _virtual_space; |
coleenp@4037 | 408 | MetaWord* _top; |
coleenp@4037 | 409 | |
coleenp@4037 | 410 | // Convenience functions for logical bottom and end |
coleenp@4037 | 411 | MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
coleenp@4037 | 412 | MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
coleenp@4037 | 413 | |
coleenp@4037 | 414 | // Convenience functions to access the _virtual_space |
coleenp@4037 | 415 | char* low() const { return virtual_space()->low(); } |
coleenp@4037 | 416 | char* high() const { return virtual_space()->high(); } |
coleenp@4037 | 417 | |
coleenp@4037 | 418 | public: |
coleenp@4037 | 419 | |
coleenp@4037 | 420 | VirtualSpaceNode(size_t byte_size); |
coleenp@4037 | 421 | VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {} |
coleenp@4037 | 422 | ~VirtualSpaceNode(); |
coleenp@4037 | 423 | |
coleenp@4037 | 424 | // address of next available space in _virtual_space; |
coleenp@4037 | 425 | // Accessors |
coleenp@4037 | 426 | VirtualSpaceNode* next() { return _next; } |
coleenp@4037 | 427 | void set_next(VirtualSpaceNode* v) { _next = v; } |
coleenp@4037 | 428 | |
coleenp@4037 | 429 | void set_reserved(MemRegion const v) { _reserved = v; } |
coleenp@4037 | 430 | void set_top(MetaWord* v) { _top = v; } |
coleenp@4037 | 431 | |
coleenp@4037 | 432 | // Accessors |
coleenp@4037 | 433 | MemRegion* reserved() { return &_reserved; } |
coleenp@4037 | 434 | VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
coleenp@4037 | 435 | |
coleenp@4037 | 436 | // Returns true if "word_size" is available in the virtual space |
coleenp@4037 | 437 | bool is_available(size_t word_size) { return _top + word_size <= end(); } |
coleenp@4037 | 438 | |
coleenp@4037 | 439 | MetaWord* top() const { return _top; } |
coleenp@4037 | 440 | void inc_top(size_t word_size) { _top += word_size; } |
coleenp@4037 | 441 | |
coleenp@4037 | 442 | // used and capacity in this single entry in the list |
coleenp@4037 | 443 | size_t used_words_in_vs() const; |
coleenp@4037 | 444 | size_t capacity_words_in_vs() const; |
coleenp@4037 | 445 | |
coleenp@4037 | 446 | bool initialize(); |
coleenp@4037 | 447 | |
coleenp@4037 | 448 | // get space from the virtual space |
coleenp@4037 | 449 | Metachunk* take_from_committed(size_t chunk_word_size); |
coleenp@4037 | 450 | |
coleenp@4037 | 451 | // Allocate a chunk from the virtual space and return it. |
coleenp@4037 | 452 | Metachunk* get_chunk_vs(size_t chunk_word_size); |
coleenp@4037 | 453 | Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size); |
coleenp@4037 | 454 | |
coleenp@4037 | 455 | // Expands/shrinks the committed space in a virtual space. Delegates |
coleenp@4037 | 456 | // to Virtualspace |
coleenp@4037 | 457 | bool expand_by(size_t words, bool pre_touch = false); |
coleenp@4037 | 458 | bool shrink_by(size_t words); |
coleenp@4037 | 459 | |
coleenp@4037 | 460 | // Debug support |
coleenp@4037 | 461 | static void verify_virtual_space_total(); |
coleenp@4037 | 462 | static void verify_virtual_space_count(); |
coleenp@4037 | 463 | void mangle(); |
coleenp@4037 | 464 | |
coleenp@4037 | 465 | void print_on(outputStream* st) const; |
coleenp@4037 | 466 | }; |
coleenp@4037 | 467 | |
coleenp@4037 | 468 | // byte_size is the size of the associated virtualspace. |
coleenp@4037 | 469 | VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) { |
coleenp@4037 | 470 | // This allocates memory with mmap. For DumpSharedspaces, allocate the |
coleenp@4037 | 471 | // space at low memory so that other shared images don't conflict. |
coleenp@4037 | 472 | // This is the same address as memory needed for UseCompressedOops but |
coleenp@4037 | 473 | // compressed oops don't work with CDS (offsets in metadata are wrong), so |
coleenp@4037 | 474 | // borrow the same address. |
coleenp@4037 | 475 | if (DumpSharedSpaces) { |
coleenp@4037 | 476 | char* shared_base = (char*)HeapBaseMinAddress; |
coleenp@4037 | 477 | _rs = ReservedSpace(byte_size, 0, false, shared_base, 0); |
coleenp@4037 | 478 | if (_rs.is_reserved()) { |
coleenp@4037 | 479 | assert(_rs.base() == shared_base, "should match"); |
coleenp@4037 | 480 | } else { |
coleenp@4037 | 481 | // If we are dumping the heap, then allocate a wasted block of address |
coleenp@4037 | 482 | // space in order to push the heap to a lower address. This extra |
coleenp@4037 | 483 | // address range allows for other (or larger) libraries to be loaded |
coleenp@4037 | 484 | // without them occupying the space required for the shared spaces. |
coleenp@4037 | 485 | uintx reserved = 0; |
coleenp@4037 | 486 | uintx block_size = 64*1024*1024; |
coleenp@4037 | 487 | while (reserved < SharedDummyBlockSize) { |
coleenp@4037 | 488 | char* dummy = os::reserve_memory(block_size); |
coleenp@4037 | 489 | reserved += block_size; |
coleenp@4037 | 490 | } |
coleenp@4037 | 491 | _rs = ReservedSpace(byte_size); |
coleenp@4037 | 492 | } |
coleenp@4037 | 493 | MetaspaceShared::set_shared_rs(&_rs); |
coleenp@4037 | 494 | } else { |
coleenp@4037 | 495 | _rs = ReservedSpace(byte_size); |
coleenp@4037 | 496 | } |
coleenp@4037 | 497 | |
coleenp@4037 | 498 | MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
coleenp@4037 | 499 | } |
coleenp@4037 | 500 | |
coleenp@4037 | 501 | // List of VirtualSpaces for metadata allocation. |
coleenp@4037 | 502 | // It has a _next link for singly linked list and a MemRegion |
coleenp@4037 | 503 | // for total space in the VirtualSpace. |
coleenp@4037 | 504 | class VirtualSpaceList : public CHeapObj<mtClass> { |
coleenp@4037 | 505 | friend class VirtualSpaceNode; |
coleenp@4037 | 506 | |
coleenp@4037 | 507 | enum VirtualSpaceSizes { |
coleenp@4037 | 508 | VirtualSpaceSize = 256 * K |
coleenp@4037 | 509 | }; |
coleenp@4037 | 510 | |
coleenp@4037 | 511 | // Global list of virtual spaces |
coleenp@4037 | 512 | // Head of the list |
coleenp@4037 | 513 | VirtualSpaceNode* _virtual_space_list; |
coleenp@4037 | 514 | // virtual space currently being used for allocations |
coleenp@4037 | 515 | VirtualSpaceNode* _current_virtual_space; |
coleenp@4037 | 516 | // Free chunk list for all other metadata |
coleenp@4037 | 517 | ChunkManager _chunk_manager; |
coleenp@4037 | 518 | |
coleenp@4037 | 519 | // Can this virtual list allocate >1 spaces? Also, used to determine |
coleenp@4037 | 520 | // whether to allocate unlimited small chunks in this virtual space |
coleenp@4037 | 521 | bool _is_class; |
coleenp@4037 | 522 | bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; } |
coleenp@4037 | 523 | |
coleenp@4037 | 524 | // Sum of space in all virtual spaces and number of virtual spaces |
coleenp@4037 | 525 | size_t _virtual_space_total; |
coleenp@4037 | 526 | size_t _virtual_space_count; |
coleenp@4037 | 527 | |
coleenp@4037 | 528 | ~VirtualSpaceList(); |
coleenp@4037 | 529 | |
coleenp@4037 | 530 | VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
coleenp@4037 | 531 | |
coleenp@4037 | 532 | void set_virtual_space_list(VirtualSpaceNode* v) { |
coleenp@4037 | 533 | _virtual_space_list = v; |
coleenp@4037 | 534 | } |
coleenp@4037 | 535 | void set_current_virtual_space(VirtualSpaceNode* v) { |
coleenp@4037 | 536 | _current_virtual_space = v; |
coleenp@4037 | 537 | } |
coleenp@4037 | 538 | |
coleenp@4037 | 539 | void link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size); |
coleenp@4037 | 540 | |
coleenp@4037 | 541 | // Get another virtual space and add it to the list. This |
coleenp@4037 | 542 | // is typically prompted by a failed attempt to allocate a chunk |
coleenp@4037 | 543 | // and is typically followed by the allocation of a chunk. |
coleenp@4037 | 544 | bool grow_vs(size_t vs_word_size); |
coleenp@4037 | 545 | |
coleenp@4037 | 546 | public: |
coleenp@4037 | 547 | VirtualSpaceList(size_t word_size); |
coleenp@4037 | 548 | VirtualSpaceList(ReservedSpace rs); |
coleenp@4037 | 549 | |
coleenp@4037 | 550 | Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words); |
coleenp@4037 | 551 | |
coleenp@4037 | 552 | VirtualSpaceNode* current_virtual_space() { |
coleenp@4037 | 553 | return _current_virtual_space; |
coleenp@4037 | 554 | } |
coleenp@4037 | 555 | |
coleenp@4037 | 556 | ChunkManager* chunk_manager() { return &_chunk_manager; } |
coleenp@4037 | 557 | bool is_class() const { return _is_class; } |
coleenp@4037 | 558 | |
coleenp@4037 | 559 | // Allocate the first virtualspace. |
coleenp@4037 | 560 | void initialize(size_t word_size); |
coleenp@4037 | 561 | |
coleenp@4037 | 562 | size_t virtual_space_total() { return _virtual_space_total; } |
coleenp@4037 | 563 | void inc_virtual_space_total(size_t v) { |
coleenp@4037 | 564 | Atomic::add_ptr(v, &_virtual_space_total); |
coleenp@4037 | 565 | } |
coleenp@4037 | 566 | |
coleenp@4037 | 567 | size_t virtual_space_count() { return _virtual_space_count; } |
coleenp@4037 | 568 | void inc_virtual_space_count() { |
coleenp@4037 | 569 | Atomic::inc_ptr(&_virtual_space_count); |
coleenp@4037 | 570 | } |
coleenp@4037 | 571 | |
coleenp@4037 | 572 | // Used and capacity in the entire list of virtual spaces. |
coleenp@4037 | 573 | // These are global values shared by all Metaspaces |
coleenp@4037 | 574 | size_t capacity_words_sum(); |
coleenp@4037 | 575 | size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; } |
coleenp@4037 | 576 | size_t used_words_sum(); |
coleenp@4037 | 577 | size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; } |
coleenp@4037 | 578 | |
coleenp@4037 | 579 | bool contains(const void *ptr); |
coleenp@4037 | 580 | |
coleenp@4037 | 581 | void print_on(outputStream* st) const; |
coleenp@4037 | 582 | |
coleenp@4037 | 583 | class VirtualSpaceListIterator : public StackObj { |
coleenp@4037 | 584 | VirtualSpaceNode* _virtual_spaces; |
coleenp@4037 | 585 | public: |
coleenp@4037 | 586 | VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
coleenp@4037 | 587 | _virtual_spaces(virtual_spaces) {} |
coleenp@4037 | 588 | |
coleenp@4037 | 589 | bool repeat() { |
coleenp@4037 | 590 | return _virtual_spaces != NULL; |
coleenp@4037 | 591 | } |
coleenp@4037 | 592 | |
coleenp@4037 | 593 | VirtualSpaceNode* get_next() { |
coleenp@4037 | 594 | VirtualSpaceNode* result = _virtual_spaces; |
coleenp@4037 | 595 | if (_virtual_spaces != NULL) { |
coleenp@4037 | 596 | _virtual_spaces = _virtual_spaces->next(); |
coleenp@4037 | 597 | } |
coleenp@4037 | 598 | return result; |
coleenp@4037 | 599 | } |
coleenp@4037 | 600 | }; |
coleenp@4037 | 601 | }; |
coleenp@4037 | 602 | |
coleenp@4037 | 603 | |
coleenp@4037 | 604 | class Metadebug : AllStatic { |
coleenp@4037 | 605 | // Debugging support for Metaspaces |
coleenp@4037 | 606 | static int _deallocate_block_a_lot_count; |
coleenp@4037 | 607 | static int _deallocate_chunk_a_lot_count; |
coleenp@4037 | 608 | static int _allocation_fail_alot_count; |
coleenp@4037 | 609 | |
coleenp@4037 | 610 | public: |
coleenp@4037 | 611 | static int deallocate_block_a_lot_count() { |
coleenp@4037 | 612 | return _deallocate_block_a_lot_count; |
coleenp@4037 | 613 | } |
coleenp@4037 | 614 | static void set_deallocate_block_a_lot_count(int v) { |
coleenp@4037 | 615 | _deallocate_block_a_lot_count = v; |
coleenp@4037 | 616 | } |
coleenp@4037 | 617 | static void inc_deallocate_block_a_lot_count() { |
coleenp@4037 | 618 | _deallocate_block_a_lot_count++; |
coleenp@4037 | 619 | } |
coleenp@4037 | 620 | static int deallocate_chunk_a_lot_count() { |
coleenp@4037 | 621 | return _deallocate_chunk_a_lot_count; |
coleenp@4037 | 622 | } |
coleenp@4037 | 623 | static void reset_deallocate_chunk_a_lot_count() { |
coleenp@4037 | 624 | _deallocate_chunk_a_lot_count = 1; |
coleenp@4037 | 625 | } |
coleenp@4037 | 626 | static void inc_deallocate_chunk_a_lot_count() { |
coleenp@4037 | 627 | _deallocate_chunk_a_lot_count++; |
coleenp@4037 | 628 | } |
coleenp@4037 | 629 | |
coleenp@4037 | 630 | static void init_allocation_fail_alot_count(); |
coleenp@4037 | 631 | #ifdef ASSERT |
coleenp@4037 | 632 | static bool test_metadata_failure(); |
coleenp@4037 | 633 | #endif |
coleenp@4037 | 634 | |
coleenp@4037 | 635 | static void deallocate_chunk_a_lot(SpaceManager* sm, |
coleenp@4037 | 636 | size_t chunk_word_size); |
coleenp@4037 | 637 | static void deallocate_block_a_lot(SpaceManager* sm, |
coleenp@4037 | 638 | size_t chunk_word_size); |
coleenp@4037 | 639 | |
coleenp@4037 | 640 | }; |
coleenp@4037 | 641 | |
coleenp@4037 | 642 | int Metadebug::_deallocate_block_a_lot_count = 0; |
coleenp@4037 | 643 | int Metadebug::_deallocate_chunk_a_lot_count = 0; |
coleenp@4037 | 644 | int Metadebug::_allocation_fail_alot_count = 0; |
coleenp@4037 | 645 | |
coleenp@4037 | 646 | // SpaceManager - used by Metaspace to handle allocations |
coleenp@4037 | 647 | class SpaceManager : public CHeapObj<mtClass> { |
coleenp@4037 | 648 | friend class Metaspace; |
coleenp@4037 | 649 | friend class Metadebug; |
coleenp@4037 | 650 | |
coleenp@4037 | 651 | private: |
coleenp@4037 | 652 | // protects allocations and contains. |
coleenp@4037 | 653 | Mutex* const _lock; |
coleenp@4037 | 654 | |
coleenp@4037 | 655 | // List of chunks in use by this SpaceManager. Allocations |
coleenp@4037 | 656 | // are done from the current chunk. The list is used for deallocating |
coleenp@4037 | 657 | // chunks when the SpaceManager is freed. |
coleenp@4037 | 658 | Metachunk* _chunks_in_use[NumberOfFreeLists]; |
coleenp@4037 | 659 | Metachunk* _current_chunk; |
coleenp@4037 | 660 | |
coleenp@4037 | 661 | // Virtual space where allocation comes from. |
coleenp@4037 | 662 | VirtualSpaceList* _vs_list; |
coleenp@4037 | 663 | |
coleenp@4037 | 664 | // Number of small chunks to allocate to a manager |
coleenp@4037 | 665 | // If class space manager, small chunks are unlimited |
coleenp@4037 | 666 | static uint const _small_chunk_limit; |
coleenp@4037 | 667 | bool has_small_chunk_limit() { return !vs_list()->is_class(); } |
coleenp@4037 | 668 | |
coleenp@4037 | 669 | // Sum of all space in allocated chunks |
coleenp@4037 | 670 | size_t _allocation_total; |
coleenp@4037 | 671 | |
coleenp@4037 | 672 | // Free lists of blocks are per SpaceManager since they |
coleenp@4037 | 673 | // are assumed to be in chunks in use by the SpaceManager |
coleenp@4037 | 674 | // and all chunks in use by a SpaceManager are freed when |
coleenp@4037 | 675 | // the class loader using the SpaceManager is collected. |
coleenp@4037 | 676 | BlockFreelist _block_freelists; |
coleenp@4037 | 677 | |
coleenp@4037 | 678 | // protects virtualspace and chunk expansions |
coleenp@4037 | 679 | static const char* _expand_lock_name; |
coleenp@4037 | 680 | static const int _expand_lock_rank; |
coleenp@4037 | 681 | static Mutex* const _expand_lock; |
coleenp@4037 | 682 | |
coleenp@4037 | 683 | // Accessors |
coleenp@4037 | 684 | Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
coleenp@4037 | 685 | void set_chunks_in_use(ChunkIndex index, Metachunk* v) { _chunks_in_use[index] = v; } |
coleenp@4037 | 686 | |
coleenp@4037 | 687 | BlockFreelist* block_freelists() const { |
coleenp@4037 | 688 | return (BlockFreelist*) &_block_freelists; |
coleenp@4037 | 689 | } |
coleenp@4037 | 690 | |
coleenp@4037 | 691 | VirtualSpaceList* vs_list() const { return _vs_list; } |
coleenp@4037 | 692 | |
coleenp@4037 | 693 | Metachunk* current_chunk() const { return _current_chunk; } |
coleenp@4037 | 694 | void set_current_chunk(Metachunk* v) { |
coleenp@4037 | 695 | _current_chunk = v; |
coleenp@4037 | 696 | } |
coleenp@4037 | 697 | |
coleenp@4037 | 698 | Metachunk* find_current_chunk(size_t word_size); |
coleenp@4037 | 699 | |
coleenp@4037 | 700 | // Add chunk to the list of chunks in use |
coleenp@4037 | 701 | void add_chunk(Metachunk* v, bool make_current); |
coleenp@4037 | 702 | |
coleenp@4037 | 703 | // Debugging support |
coleenp@4037 | 704 | void verify_chunks_in_use_index(ChunkIndex index, Metachunk* v) { |
coleenp@4037 | 705 | switch (index) { |
coleenp@4037 | 706 | case 0: |
coleenp@4037 | 707 | assert(v->word_size() == SmallChunk, "Not a SmallChunk"); |
coleenp@4037 | 708 | break; |
coleenp@4037 | 709 | case 1: |
coleenp@4037 | 710 | assert(v->word_size() == MediumChunk, "Not a MediumChunk"); |
coleenp@4037 | 711 | break; |
coleenp@4037 | 712 | case 2: |
coleenp@4037 | 713 | assert(v->word_size() > MediumChunk, "Not a HumongousChunk"); |
coleenp@4037 | 714 | break; |
coleenp@4037 | 715 | default: |
coleenp@4037 | 716 | assert(false, "Wrong list."); |
coleenp@4037 | 717 | } |
coleenp@4037 | 718 | } |
coleenp@4037 | 719 | |
coleenp@4037 | 720 | protected: |
coleenp@4037 | 721 | Mutex* lock() const { return _lock; } |
coleenp@4037 | 722 | |
coleenp@4037 | 723 | public: |
coleenp@4037 | 724 | SpaceManager(Mutex* lock, VirtualSpaceList* vs_list); |
coleenp@4037 | 725 | ~SpaceManager(); |
coleenp@4037 | 726 | |
coleenp@4037 | 727 | enum ChunkSizes { // in words. |
coleenp@4037 | 728 | SmallChunk = 512, |
coleenp@4037 | 729 | MediumChunk = 8 * K, |
coleenp@4037 | 730 | MediumChunkBunch = 4 * MediumChunk |
coleenp@4037 | 731 | }; |
coleenp@4037 | 732 | |
coleenp@4037 | 733 | // Accessors |
coleenp@4037 | 734 | size_t allocation_total() const { return _allocation_total; } |
coleenp@4037 | 735 | void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); } |
coleenp@4037 | 736 | static bool is_humongous(size_t word_size) { return word_size > MediumChunk; } |
coleenp@4037 | 737 | |
coleenp@4037 | 738 | static Mutex* expand_lock() { return _expand_lock; } |
coleenp@4037 | 739 | |
coleenp@4037 | 740 | size_t sum_capacity_in_chunks_in_use() const; |
coleenp@4037 | 741 | size_t sum_used_in_chunks_in_use() const; |
coleenp@4037 | 742 | size_t sum_free_in_chunks_in_use() const; |
coleenp@4037 | 743 | size_t sum_waste_in_chunks_in_use() const; |
coleenp@4037 | 744 | size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
coleenp@4037 | 745 | |
coleenp@4037 | 746 | size_t sum_count_in_chunks_in_use(); |
coleenp@4037 | 747 | size_t sum_count_in_chunks_in_use(ChunkIndex i); |
coleenp@4037 | 748 | |
coleenp@4037 | 749 | // Block allocation and deallocation. |
coleenp@4037 | 750 | // Allocates a block from the current chunk |
coleenp@4037 | 751 | MetaWord* allocate(size_t word_size); |
coleenp@4037 | 752 | |
coleenp@4037 | 753 | // Helper for allocations |
coleenp@4037 | 754 | Metablock* allocate_work(size_t word_size); |
coleenp@4037 | 755 | |
coleenp@4037 | 756 | // Returns a block to the per manager freelist |
coleenp@4037 | 757 | void deallocate(MetaWord* p); |
coleenp@4037 | 758 | |
coleenp@4037 | 759 | // Based on the allocation size and a minimum chunk size, |
coleenp@4037 | 760 | // returned chunk size (for expanding space for chunk allocation). |
coleenp@4037 | 761 | size_t calc_chunk_size(size_t allocation_word_size); |
coleenp@4037 | 762 | |
coleenp@4037 | 763 | // Called when an allocation from the current chunk fails. |
coleenp@4037 | 764 | // Gets a new chunk (may require getting a new virtual space), |
coleenp@4037 | 765 | // and allocates from that chunk. |
coleenp@4037 | 766 | Metablock* grow_and_allocate(size_t word_size); |
coleenp@4037 | 767 | |
coleenp@4037 | 768 | // debugging support. |
coleenp@4037 | 769 | |
coleenp@4037 | 770 | void dump(outputStream* const out) const; |
coleenp@4037 | 771 | void print_on(outputStream* st) const; |
coleenp@4037 | 772 | void locked_print_chunks_in_use_on(outputStream* st) const; |
coleenp@4037 | 773 | |
coleenp@4037 | 774 | void verify(); |
coleenp@4037 | 775 | #ifdef ASSERT |
coleenp@4037 | 776 | void mangle_freed_chunks(); |
coleenp@4037 | 777 | void verify_allocation_total(); |
coleenp@4037 | 778 | #endif |
coleenp@4037 | 779 | }; |
coleenp@4037 | 780 | |
coleenp@4037 | 781 | uint const SpaceManager::_small_chunk_limit = 4; |
coleenp@4037 | 782 | |
coleenp@4037 | 783 | const char* SpaceManager::_expand_lock_name = |
coleenp@4037 | 784 | "SpaceManager chunk allocation lock"; |
coleenp@4037 | 785 | const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
coleenp@4037 | 786 | Mutex* const SpaceManager::_expand_lock = |
coleenp@4037 | 787 | new Mutex(SpaceManager::_expand_lock_rank, |
coleenp@4037 | 788 | SpaceManager::_expand_lock_name, |
coleenp@4037 | 789 | Mutex::_allow_vm_block_flag); |
coleenp@4037 | 790 | |
coleenp@4037 | 791 | #ifdef ASSERT |
coleenp@4037 | 792 | size_t Metablock::_overhead = |
coleenp@4037 | 793 | Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord; |
coleenp@4037 | 794 | #else |
coleenp@4037 | 795 | size_t Metablock::_overhead = 0; |
coleenp@4037 | 796 | #endif |
coleenp@4037 | 797 | size_t Metachunk::_overhead = |
coleenp@4037 | 798 | Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord; |
coleenp@4037 | 799 | |
coleenp@4037 | 800 | // New blocks returned by the Metaspace are zero initialized. |
coleenp@4037 | 801 | // We should fix the constructors to not assume this instead. |
coleenp@4037 | 802 | Metablock* Metablock::initialize(MetaWord* p, size_t word_size) { |
coleenp@4037 | 803 | Metablock* result = (Metablock*) p; |
coleenp@4037 | 804 | |
coleenp@4037 | 805 | // Clear the memory |
coleenp@4037 | 806 | Copy::fill_to_aligned_words((HeapWord*)result, word_size); |
coleenp@4037 | 807 | #ifdef ASSERT |
coleenp@4037 | 808 | result->set_word_size(word_size); |
coleenp@4037 | 809 | // Check after work size is set. |
coleenp@4037 | 810 | result->set_leader((void*) metaspace_allocation_leader); |
coleenp@4037 | 811 | result->set_trailer((void*) metaspace_allocation_trailer); |
coleenp@4037 | 812 | #endif |
coleenp@4037 | 813 | return result; |
coleenp@4037 | 814 | } |
coleenp@4037 | 815 | |
coleenp@4037 | 816 | void Metablock::verify() { |
coleenp@4037 | 817 | #ifdef ASSERT |
coleenp@4037 | 818 | assert(leader() == metaspace_allocation_leader && |
coleenp@4037 | 819 | trailer() == metaspace_allocation_trailer, |
coleenp@4037 | 820 | "block has been corrupted"); |
coleenp@4037 | 821 | #endif |
coleenp@4037 | 822 | } |
coleenp@4037 | 823 | |
coleenp@4037 | 824 | // Metachunk methods |
coleenp@4037 | 825 | |
coleenp@4037 | 826 | Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) { |
coleenp@4037 | 827 | // Set bottom, top, and end. Allow space for the Metachunk itself |
coleenp@4037 | 828 | Metachunk* chunk = (Metachunk*) ptr; |
coleenp@4037 | 829 | |
coleenp@4037 | 830 | MetaWord* chunk_bottom = ptr + _overhead; |
coleenp@4037 | 831 | chunk->set_bottom(ptr); |
coleenp@4037 | 832 | chunk->set_top(chunk_bottom); |
coleenp@4037 | 833 | MetaWord* chunk_end = ptr + word_size; |
coleenp@4037 | 834 | assert(chunk_end > chunk_bottom, "Chunk must be too small"); |
coleenp@4037 | 835 | chunk->set_end(chunk_end); |
coleenp@4037 | 836 | chunk->set_next(NULL); |
coleenp@4037 | 837 | chunk->set_word_size(word_size); |
coleenp@4037 | 838 | #ifdef ASSERT |
coleenp@4037 | 839 | size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord)); |
coleenp@4037 | 840 | Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize); |
coleenp@4037 | 841 | #endif |
coleenp@4037 | 842 | return chunk; |
coleenp@4037 | 843 | } |
coleenp@4037 | 844 | |
coleenp@4037 | 845 | |
coleenp@4037 | 846 | Metablock* Metachunk::allocate(size_t word_size) { |
coleenp@4037 | 847 | Metablock* result = NULL; |
coleenp@4037 | 848 | // If available, bump the pointer to allocate. |
coleenp@4037 | 849 | if (free_word_size() >= word_size) { |
coleenp@4037 | 850 | result = Metablock::initialize(_top, word_size); |
coleenp@4037 | 851 | _top = _top + word_size; |
coleenp@4037 | 852 | } |
coleenp@4037 | 853 | #ifdef ASSERT |
coleenp@4037 | 854 | assert(result == NULL || |
coleenp@4037 | 855 | result->word_size() == word_size, |
coleenp@4037 | 856 | "Block size is not set correctly"); |
coleenp@4037 | 857 | #endif |
coleenp@4037 | 858 | return result; |
coleenp@4037 | 859 | } |
coleenp@4037 | 860 | |
coleenp@4037 | 861 | // _bottom points to the start of the chunk including the overhead. |
coleenp@4037 | 862 | size_t Metachunk::used_word_size() { |
coleenp@4037 | 863 | return pointer_delta(_top, _bottom, sizeof(MetaWord)); |
coleenp@4037 | 864 | } |
coleenp@4037 | 865 | |
coleenp@4037 | 866 | size_t Metachunk::free_word_size() { |
coleenp@4037 | 867 | return pointer_delta(_end, _top, sizeof(MetaWord)); |
coleenp@4037 | 868 | } |
coleenp@4037 | 869 | |
coleenp@4037 | 870 | size_t Metachunk::capacity_word_size() { |
coleenp@4037 | 871 | return pointer_delta(_end, _bottom, sizeof(MetaWord)); |
coleenp@4037 | 872 | } |
coleenp@4037 | 873 | |
coleenp@4037 | 874 | void Metachunk::print_on(outputStream* st) const { |
coleenp@4037 | 875 | st->print_cr("Metachunk:" |
coleenp@4037 | 876 | " bottom " PTR_FORMAT " top " PTR_FORMAT |
coleenp@4037 | 877 | " end " PTR_FORMAT " size " SIZE_FORMAT, |
coleenp@4037 | 878 | bottom(), top(), end(), word_size()); |
coleenp@4037 | 879 | } |
coleenp@4037 | 880 | |
coleenp@4037 | 881 | |
coleenp@4037 | 882 | void Metachunk::verify() { |
coleenp@4037 | 883 | #ifdef ASSERT |
coleenp@4037 | 884 | // Cannot walk through the blocks unless the blocks have |
coleenp@4037 | 885 | // headers with sizes. |
coleenp@4037 | 886 | MetaWord* curr = bottom() + overhead(); |
coleenp@4037 | 887 | while (curr < top()) { |
coleenp@4037 | 888 | Metablock* block = (Metablock*) curr; |
coleenp@4037 | 889 | size_t word_size = block->word_size(); |
coleenp@4037 | 890 | block->verify(); |
coleenp@4037 | 891 | curr = curr + word_size; |
coleenp@4037 | 892 | } |
coleenp@4037 | 893 | #endif |
coleenp@4037 | 894 | return; |
coleenp@4037 | 895 | } |
coleenp@4037 | 896 | |
coleenp@4037 | 897 | // BlockFreelist methods |
coleenp@4037 | 898 | |
coleenp@4037 | 899 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 900 | BlockFreelist::BlockFreelist() : _dictionary(NULL) {} |
coleenp@4037 | 901 | #else |
coleenp@4037 | 902 | BlockFreelist::BlockFreelist() {} |
coleenp@4037 | 903 | #endif |
coleenp@4037 | 904 | |
coleenp@4037 | 905 | BlockFreelist::~BlockFreelist() { |
coleenp@4037 | 906 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 907 | if (_dictionary != NULL) { |
coleenp@4037 | 908 | if (Verbose && TraceMetadataChunkAllocation) { |
coleenp@4037 | 909 | _dictionary->print_free_lists(gclog_or_tty); |
coleenp@4037 | 910 | } |
coleenp@4037 | 911 | delete _dictionary; |
coleenp@4037 | 912 | } |
coleenp@4037 | 913 | #endif |
coleenp@4037 | 914 | } |
coleenp@4037 | 915 | |
coleenp@4037 | 916 | Metablock* BlockFreelist::initialize_free_chunk(Metablock* block, size_t word_size) { |
coleenp@4037 | 917 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 918 | #ifdef ASSERT |
coleenp@4037 | 919 | assert(word_size = block->word_size(), "Wrong chunk size"); |
coleenp@4037 | 920 | #endif |
coleenp@4037 | 921 | Metablock* result = block; |
coleenp@4037 | 922 | result->setSize(word_size); |
coleenp@4037 | 923 | result->linkPrev(NULL); |
coleenp@4037 | 924 | result->linkNext(NULL); |
coleenp@4037 | 925 | |
coleenp@4037 | 926 | return result; |
coleenp@4037 | 927 | #else |
coleenp@4037 | 928 | ShouldNotReachHere(); |
coleenp@4037 | 929 | return block; |
coleenp@4037 | 930 | #endif |
coleenp@4037 | 931 | } |
coleenp@4037 | 932 | |
coleenp@4037 | 933 | void BlockFreelist::return_block(Metablock* block, size_t word_size) { |
coleenp@4037 | 934 | #ifdef ASSERT |
coleenp@4037 | 935 | assert(word_size = block->word_size(), "Block size is wrong");; |
coleenp@4037 | 936 | #endif |
coleenp@4037 | 937 | Metablock* free_chunk = initialize_free_chunk(block, word_size); |
coleenp@4037 | 938 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 939 | if (dictionary() == NULL) { |
coleenp@4037 | 940 | _dictionary = new BinaryTreeDictionary<Metablock>(false /* adaptive_freelists */); |
coleenp@4037 | 941 | } |
coleenp@4037 | 942 | dictionary()->returnChunk(free_chunk); |
coleenp@4037 | 943 | #endif |
coleenp@4037 | 944 | } |
coleenp@4037 | 945 | |
coleenp@4037 | 946 | Metablock* BlockFreelist::get_block(size_t word_size) { |
coleenp@4037 | 947 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 948 | if (dictionary() == NULL) { |
coleenp@4037 | 949 | return NULL; |
coleenp@4037 | 950 | } |
coleenp@4037 | 951 | |
coleenp@4037 | 952 | Metablock* free_chunk = |
coleenp@4037 | 953 | dictionary()->getChunk(word_size, FreeBlockDictionary<Metablock>::exactly); |
coleenp@4037 | 954 | #else |
coleenp@4037 | 955 | Metablock* free_chunk = NULL; |
coleenp@4037 | 956 | #endif |
coleenp@4037 | 957 | if (free_chunk == NULL) { |
coleenp@4037 | 958 | return NULL; |
coleenp@4037 | 959 | } |
coleenp@4037 | 960 | assert(free_chunk->word_size() == word_size, "Size of chunk is incorrect"); |
coleenp@4037 | 961 | Metablock* block = Metablock::initialize((MetaWord*) free_chunk, word_size); |
coleenp@4037 | 962 | #ifdef ASSERT |
coleenp@4037 | 963 | assert(block->word_size() == word_size, "Block size is not set correctly"); |
coleenp@4037 | 964 | #endif |
coleenp@4037 | 965 | |
coleenp@4037 | 966 | return block; |
coleenp@4037 | 967 | } |
coleenp@4037 | 968 | |
coleenp@4037 | 969 | void BlockFreelist::print_on(outputStream* st) const { |
coleenp@4037 | 970 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 971 | if (dictionary() == NULL) { |
coleenp@4037 | 972 | return; |
coleenp@4037 | 973 | } |
coleenp@4037 | 974 | dictionary()->print_free_lists(st); |
coleenp@4037 | 975 | #else |
coleenp@4037 | 976 | return; |
coleenp@4037 | 977 | #endif |
coleenp@4037 | 978 | } |
coleenp@4037 | 979 | |
coleenp@4037 | 980 | // VirtualSpaceNode methods |
coleenp@4037 | 981 | |
coleenp@4037 | 982 | VirtualSpaceNode::~VirtualSpaceNode() { |
coleenp@4037 | 983 | _rs.release(); |
coleenp@4037 | 984 | } |
coleenp@4037 | 985 | |
coleenp@4037 | 986 | size_t VirtualSpaceNode::used_words_in_vs() const { |
coleenp@4037 | 987 | return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
coleenp@4037 | 988 | } |
coleenp@4037 | 989 | |
coleenp@4037 | 990 | // Space committed in the VirtualSpace |
coleenp@4037 | 991 | size_t VirtualSpaceNode::capacity_words_in_vs() const { |
coleenp@4037 | 992 | return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
coleenp@4037 | 993 | } |
coleenp@4037 | 994 | |
coleenp@4037 | 995 | |
coleenp@4037 | 996 | // Allocates the chunk from the virtual space only. |
coleenp@4037 | 997 | // This interface is also used internally for debugging. Not all |
coleenp@4037 | 998 | // chunks removed here are necessarily used for allocation. |
coleenp@4037 | 999 | Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
coleenp@4037 | 1000 | // Bottom of the new chunk |
coleenp@4037 | 1001 | MetaWord* chunk_limit = top(); |
coleenp@4037 | 1002 | assert(chunk_limit != NULL, "Not safe to call this method"); |
coleenp@4037 | 1003 | |
coleenp@4037 | 1004 | if (!is_available(chunk_word_size)) { |
coleenp@4037 | 1005 | if (TraceMetadataChunkAllocation) { |
coleenp@4037 | 1006 | tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size); |
coleenp@4037 | 1007 | // Dump some information about the virtual space that is nearly full |
coleenp@4037 | 1008 | print_on(tty); |
coleenp@4037 | 1009 | } |
coleenp@4037 | 1010 | return NULL; |
coleenp@4037 | 1011 | } |
coleenp@4037 | 1012 | |
coleenp@4037 | 1013 | // Take the space (bump top on the current virtual space). |
coleenp@4037 | 1014 | inc_top(chunk_word_size); |
coleenp@4037 | 1015 | |
coleenp@4037 | 1016 | // Point the chunk at the space |
coleenp@4037 | 1017 | Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size); |
coleenp@4037 | 1018 | return result; |
coleenp@4037 | 1019 | } |
coleenp@4037 | 1020 | |
coleenp@4037 | 1021 | |
coleenp@4037 | 1022 | // Expand the virtual space (commit more of the reserved space) |
coleenp@4037 | 1023 | bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) { |
coleenp@4037 | 1024 | size_t bytes = words * BytesPerWord; |
coleenp@4037 | 1025 | bool result = virtual_space()->expand_by(bytes, pre_touch); |
coleenp@4037 | 1026 | if (TraceMetavirtualspaceAllocation && !result) { |
coleenp@4037 | 1027 | gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed " |
coleenp@4037 | 1028 | "for byte size " SIZE_FORMAT, bytes); |
coleenp@4037 | 1029 | virtual_space()->print(); |
coleenp@4037 | 1030 | } |
coleenp@4037 | 1031 | return result; |
coleenp@4037 | 1032 | } |
coleenp@4037 | 1033 | |
coleenp@4037 | 1034 | // Shrink the virtual space (commit more of the reserved space) |
coleenp@4037 | 1035 | bool VirtualSpaceNode::shrink_by(size_t words) { |
coleenp@4037 | 1036 | size_t bytes = words * BytesPerWord; |
coleenp@4037 | 1037 | virtual_space()->shrink_by(bytes); |
coleenp@4037 | 1038 | return true; |
coleenp@4037 | 1039 | } |
coleenp@4037 | 1040 | |
coleenp@4037 | 1041 | // Add another chunk to the chunk list. |
coleenp@4037 | 1042 | |
coleenp@4037 | 1043 | Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
coleenp@4037 | 1044 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1045 | Metachunk* result = NULL; |
coleenp@4037 | 1046 | |
coleenp@4037 | 1047 | return take_from_committed(chunk_word_size); |
coleenp@4037 | 1048 | } |
coleenp@4037 | 1049 | |
coleenp@4037 | 1050 | Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) { |
coleenp@4037 | 1051 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1052 | |
coleenp@4037 | 1053 | Metachunk* new_chunk = get_chunk_vs(chunk_word_size); |
coleenp@4037 | 1054 | |
coleenp@4037 | 1055 | if (new_chunk == NULL) { |
coleenp@4037 | 1056 | // Only a small part of the virtualspace is committed when first |
coleenp@4037 | 1057 | // allocated so committing more here can be expected. |
coleenp@4037 | 1058 | size_t page_size_words = os::vm_page_size() / BytesPerWord; |
coleenp@4037 | 1059 | size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size, |
coleenp@4037 | 1060 | page_size_words); |
coleenp@4037 | 1061 | expand_by(aligned_expand_vs_by_words, false); |
coleenp@4037 | 1062 | new_chunk = get_chunk_vs(chunk_word_size); |
coleenp@4037 | 1063 | } |
coleenp@4037 | 1064 | return new_chunk; |
coleenp@4037 | 1065 | } |
coleenp@4037 | 1066 | |
coleenp@4037 | 1067 | bool VirtualSpaceNode::initialize() { |
coleenp@4037 | 1068 | |
coleenp@4037 | 1069 | if (!_rs.is_reserved()) { |
coleenp@4037 | 1070 | return false; |
coleenp@4037 | 1071 | } |
coleenp@4037 | 1072 | |
coleenp@4037 | 1073 | // Commit only 1 page instead of the whole reserved space _rs.size() |
coleenp@4037 | 1074 | size_t committed_byte_size = os::vm_page_size(); |
coleenp@4037 | 1075 | bool result = virtual_space()->initialize(_rs, committed_byte_size); |
coleenp@4037 | 1076 | if (result) { |
coleenp@4037 | 1077 | set_top((MetaWord*)virtual_space()->low()); |
coleenp@4037 | 1078 | set_reserved(MemRegion((HeapWord*)_rs.base(), |
coleenp@4037 | 1079 | (HeapWord*)(_rs.base() + _rs.size()))); |
coleenp@4037 | 1080 | } |
coleenp@4037 | 1081 | |
coleenp@4037 | 1082 | assert(reserved()->start() == (HeapWord*) _rs.base(), |
coleenp@4037 | 1083 | err_msg("Reserved start was not set properly " PTR_FORMAT |
coleenp@4037 | 1084 | " != " PTR_FORMAT, reserved()->start(), _rs.base())); |
coleenp@4037 | 1085 | assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
coleenp@4037 | 1086 | err_msg("Reserved size was not set properly " SIZE_FORMAT |
coleenp@4037 | 1087 | " != " SIZE_FORMAT, reserved()->word_size(), |
coleenp@4037 | 1088 | _rs.size() / BytesPerWord)); |
coleenp@4037 | 1089 | |
coleenp@4037 | 1090 | return result; |
coleenp@4037 | 1091 | } |
coleenp@4037 | 1092 | |
coleenp@4037 | 1093 | void VirtualSpaceNode::print_on(outputStream* st) const { |
coleenp@4037 | 1094 | size_t used = used_words_in_vs(); |
coleenp@4037 | 1095 | size_t capacity = capacity_words_in_vs(); |
coleenp@4037 | 1096 | VirtualSpace* vs = virtual_space(); |
coleenp@4037 | 1097 | st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used " |
coleenp@4037 | 1098 | "[" PTR_FORMAT ", " PTR_FORMAT ", " |
coleenp@4037 | 1099 | PTR_FORMAT ", " PTR_FORMAT ")", |
coleenp@4037 | 1100 | vs, capacity / K, used * 100 / capacity, |
coleenp@4037 | 1101 | bottom(), top(), end(), |
coleenp@4037 | 1102 | vs->high_boundary()); |
coleenp@4037 | 1103 | } |
coleenp@4037 | 1104 | |
coleenp@4037 | 1105 | void VirtualSpaceNode::mangle() { |
coleenp@4037 | 1106 | size_t word_size = capacity_words_in_vs(); |
coleenp@4037 | 1107 | Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
coleenp@4037 | 1108 | } |
coleenp@4037 | 1109 | |
coleenp@4037 | 1110 | // VirtualSpaceList methods |
coleenp@4037 | 1111 | // Space allocated from the VirtualSpace |
coleenp@4037 | 1112 | |
coleenp@4037 | 1113 | VirtualSpaceList::~VirtualSpaceList() { |
coleenp@4037 | 1114 | VirtualSpaceListIterator iter(virtual_space_list()); |
coleenp@4037 | 1115 | while (iter.repeat()) { |
coleenp@4037 | 1116 | VirtualSpaceNode* vsl = iter.get_next(); |
coleenp@4037 | 1117 | delete vsl; |
coleenp@4037 | 1118 | } |
coleenp@4037 | 1119 | } |
coleenp@4037 | 1120 | |
coleenp@4037 | 1121 | size_t VirtualSpaceList::used_words_sum() { |
coleenp@4037 | 1122 | size_t allocated_by_vs = 0; |
coleenp@4037 | 1123 | VirtualSpaceListIterator iter(virtual_space_list()); |
coleenp@4037 | 1124 | while (iter.repeat()) { |
coleenp@4037 | 1125 | VirtualSpaceNode* vsl = iter.get_next(); |
coleenp@4037 | 1126 | // Sum used region [bottom, top) in each virtualspace |
coleenp@4037 | 1127 | allocated_by_vs += vsl->used_words_in_vs(); |
coleenp@4037 | 1128 | } |
coleenp@4037 | 1129 | assert(allocated_by_vs >= chunk_manager()->free_chunks_total(), |
coleenp@4037 | 1130 | err_msg("Total in free chunks " SIZE_FORMAT |
coleenp@4037 | 1131 | " greater than total from virtual_spaces " SIZE_FORMAT, |
coleenp@4037 | 1132 | allocated_by_vs, chunk_manager()->free_chunks_total())); |
coleenp@4037 | 1133 | size_t used = |
coleenp@4037 | 1134 | allocated_by_vs - chunk_manager()->free_chunks_total(); |
coleenp@4037 | 1135 | return used; |
coleenp@4037 | 1136 | } |
coleenp@4037 | 1137 | |
coleenp@4037 | 1138 | // Space available in all MetadataVirtualspaces allocated |
coleenp@4037 | 1139 | // for metadata. This is the upper limit on the capacity |
coleenp@4037 | 1140 | // of chunks allocated out of all the MetadataVirtualspaces. |
coleenp@4037 | 1141 | size_t VirtualSpaceList::capacity_words_sum() { |
coleenp@4037 | 1142 | size_t capacity = 0; |
coleenp@4037 | 1143 | VirtualSpaceListIterator iter(virtual_space_list()); |
coleenp@4037 | 1144 | while (iter.repeat()) { |
coleenp@4037 | 1145 | VirtualSpaceNode* vsl = iter.get_next(); |
coleenp@4037 | 1146 | capacity += vsl->capacity_words_in_vs(); |
coleenp@4037 | 1147 | } |
coleenp@4037 | 1148 | return capacity; |
coleenp@4037 | 1149 | } |
coleenp@4037 | 1150 | |
coleenp@4037 | 1151 | VirtualSpaceList::VirtualSpaceList(size_t word_size ) : |
coleenp@4037 | 1152 | _is_class(false), |
coleenp@4037 | 1153 | _virtual_space_list(NULL), |
coleenp@4037 | 1154 | _current_virtual_space(NULL), |
coleenp@4037 | 1155 | _virtual_space_total(0), |
coleenp@4037 | 1156 | _virtual_space_count(0) { |
coleenp@4037 | 1157 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1158 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1159 | bool initialization_succeeded = grow_vs(word_size); |
coleenp@4037 | 1160 | |
coleenp@4037 | 1161 | assert(initialization_succeeded, |
coleenp@4037 | 1162 | " VirtualSpaceList initialization should not fail"); |
coleenp@4037 | 1163 | } |
coleenp@4037 | 1164 | |
coleenp@4037 | 1165 | VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
coleenp@4037 | 1166 | _is_class(true), |
coleenp@4037 | 1167 | _virtual_space_list(NULL), |
coleenp@4037 | 1168 | _current_virtual_space(NULL), |
coleenp@4037 | 1169 | _virtual_space_total(0), |
coleenp@4037 | 1170 | _virtual_space_count(0) { |
coleenp@4037 | 1171 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1172 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1173 | VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
coleenp@4037 | 1174 | bool succeeded = class_entry->initialize(); |
coleenp@4037 | 1175 | assert(succeeded, " VirtualSpaceList initialization should not fail"); |
coleenp@4037 | 1176 | link_vs(class_entry, rs.size()/BytesPerWord); |
coleenp@4037 | 1177 | } |
coleenp@4037 | 1178 | |
coleenp@4037 | 1179 | // Allocate another meta virtual space and add it to the list. |
coleenp@4037 | 1180 | bool VirtualSpaceList::grow_vs(size_t vs_word_size) { |
coleenp@4037 | 1181 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1182 | if (vs_word_size == 0) { |
coleenp@4037 | 1183 | return false; |
coleenp@4037 | 1184 | } |
coleenp@4037 | 1185 | // Reserve the space |
coleenp@4037 | 1186 | size_t vs_byte_size = vs_word_size * BytesPerWord; |
coleenp@4037 | 1187 | assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned"); |
coleenp@4037 | 1188 | |
coleenp@4037 | 1189 | // Allocate the meta virtual space and initialize it. |
coleenp@4037 | 1190 | VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
coleenp@4037 | 1191 | if (!new_entry->initialize()) { |
coleenp@4037 | 1192 | delete new_entry; |
coleenp@4037 | 1193 | return false; |
coleenp@4037 | 1194 | } else { |
coleenp@4037 | 1195 | link_vs(new_entry, vs_word_size); |
coleenp@4037 | 1196 | return true; |
coleenp@4037 | 1197 | } |
coleenp@4037 | 1198 | } |
coleenp@4037 | 1199 | |
coleenp@4037 | 1200 | void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) { |
coleenp@4037 | 1201 | if (virtual_space_list() == NULL) { |
coleenp@4037 | 1202 | set_virtual_space_list(new_entry); |
coleenp@4037 | 1203 | } else { |
coleenp@4037 | 1204 | current_virtual_space()->set_next(new_entry); |
coleenp@4037 | 1205 | } |
coleenp@4037 | 1206 | set_current_virtual_space(new_entry); |
coleenp@4037 | 1207 | inc_virtual_space_total(vs_word_size); |
coleenp@4037 | 1208 | inc_virtual_space_count(); |
coleenp@4037 | 1209 | #ifdef ASSERT |
coleenp@4037 | 1210 | new_entry->mangle(); |
coleenp@4037 | 1211 | #endif |
coleenp@4037 | 1212 | if (TraceMetavirtualspaceAllocation && Verbose) { |
coleenp@4037 | 1213 | VirtualSpaceNode* vsl = current_virtual_space(); |
coleenp@4037 | 1214 | vsl->print_on(tty); |
coleenp@4037 | 1215 | } |
coleenp@4037 | 1216 | } |
coleenp@4037 | 1217 | |
coleenp@4037 | 1218 | Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size, |
coleenp@4037 | 1219 | size_t grow_chunks_by_words) { |
coleenp@4037 | 1220 | |
coleenp@4037 | 1221 | // Get a chunk from the chunk freelist |
coleenp@4037 | 1222 | Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words); |
coleenp@4037 | 1223 | |
coleenp@4037 | 1224 | // Allocate a chunk out of the current virtual space. |
coleenp@4037 | 1225 | if (next == NULL) { |
coleenp@4037 | 1226 | next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
coleenp@4037 | 1227 | } |
coleenp@4037 | 1228 | |
coleenp@4037 | 1229 | if (next == NULL) { |
coleenp@4037 | 1230 | // Not enough room in current virtual space. Try to commit |
coleenp@4037 | 1231 | // more space. |
coleenp@4037 | 1232 | size_t expand_vs_by_words = MAX2((size_t)SpaceManager::MediumChunkBunch, |
coleenp@4037 | 1233 | grow_chunks_by_words); |
coleenp@4037 | 1234 | size_t page_size_words = os::vm_page_size() / BytesPerWord; |
coleenp@4037 | 1235 | size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words, |
coleenp@4037 | 1236 | page_size_words); |
coleenp@4037 | 1237 | bool vs_expanded = |
coleenp@4037 | 1238 | current_virtual_space()->expand_by(aligned_expand_vs_by_words, false); |
coleenp@4037 | 1239 | if (!vs_expanded) { |
coleenp@4037 | 1240 | // Should the capacity of the metaspaces be expanded for |
coleenp@4037 | 1241 | // this allocation? If it's the virtual space for classes and is |
coleenp@4037 | 1242 | // being used for CompressedHeaders, don't allocate a new virtualspace. |
coleenp@4037 | 1243 | if (can_grow() && MetaspaceGC::should_expand(this, word_size)) { |
coleenp@4037 | 1244 | // Get another virtual space. |
coleenp@4037 | 1245 | size_t grow_vs_words = |
coleenp@4037 | 1246 | MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words); |
coleenp@4037 | 1247 | if (grow_vs(grow_vs_words)) { |
coleenp@4037 | 1248 | // Got it. It's on the list now. Get a chunk from it. |
coleenp@4037 | 1249 | next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words); |
coleenp@4037 | 1250 | } |
coleenp@4037 | 1251 | if (TraceMetadataHumongousAllocation && SpaceManager::is_humongous(word_size)) { |
coleenp@4037 | 1252 | gclog_or_tty->print_cr(" aligned_expand_vs_by_words " PTR_FORMAT, |
coleenp@4037 | 1253 | aligned_expand_vs_by_words); |
coleenp@4037 | 1254 | gclog_or_tty->print_cr(" grow_vs_words " PTR_FORMAT, |
coleenp@4037 | 1255 | grow_vs_words); |
coleenp@4037 | 1256 | } |
coleenp@4037 | 1257 | } else { |
coleenp@4037 | 1258 | // Allocation will fail and induce a GC |
coleenp@4037 | 1259 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1260 | gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():" |
coleenp@4037 | 1261 | " Fail instead of expand the metaspace"); |
coleenp@4037 | 1262 | } |
coleenp@4037 | 1263 | } |
coleenp@4037 | 1264 | } else { |
coleenp@4037 | 1265 | // The virtual space expanded, get a new chunk |
coleenp@4037 | 1266 | next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words); |
coleenp@4037 | 1267 | assert(next != NULL, "Just expanded, should succeed"); |
coleenp@4037 | 1268 | } |
coleenp@4037 | 1269 | } |
coleenp@4037 | 1270 | |
coleenp@4037 | 1271 | return next; |
coleenp@4037 | 1272 | } |
coleenp@4037 | 1273 | |
coleenp@4037 | 1274 | void VirtualSpaceList::print_on(outputStream* st) const { |
coleenp@4037 | 1275 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1276 | VirtualSpaceListIterator iter(virtual_space_list()); |
coleenp@4037 | 1277 | while (iter.repeat()) { |
coleenp@4037 | 1278 | VirtualSpaceNode* node = iter.get_next(); |
coleenp@4037 | 1279 | node->print_on(st); |
coleenp@4037 | 1280 | } |
coleenp@4037 | 1281 | } |
coleenp@4037 | 1282 | } |
coleenp@4037 | 1283 | |
coleenp@4037 | 1284 | #ifndef PRODUCT |
coleenp@4037 | 1285 | bool VirtualSpaceList::contains(const void *ptr) { |
coleenp@4037 | 1286 | VirtualSpaceNode* list = virtual_space_list(); |
coleenp@4037 | 1287 | VirtualSpaceListIterator iter(list); |
coleenp@4037 | 1288 | while (iter.repeat()) { |
coleenp@4037 | 1289 | VirtualSpaceNode* node = iter.get_next(); |
coleenp@4037 | 1290 | if (node->reserved()->contains(ptr)) { |
coleenp@4037 | 1291 | return true; |
coleenp@4037 | 1292 | } |
coleenp@4037 | 1293 | } |
coleenp@4037 | 1294 | return false; |
coleenp@4037 | 1295 | } |
coleenp@4037 | 1296 | #endif // PRODUCT |
coleenp@4037 | 1297 | |
coleenp@4037 | 1298 | |
coleenp@4037 | 1299 | // MetaspaceGC methods |
coleenp@4037 | 1300 | |
coleenp@4037 | 1301 | // VM_CollectForMetadataAllocation is the vm operation used to GC. |
coleenp@4037 | 1302 | // Within the VM operation after the GC the attempt to allocate the metadata |
coleenp@4037 | 1303 | // should succeed. If the GC did not free enough space for the metaspace |
coleenp@4037 | 1304 | // allocation, the HWM is increased so that another virtualspace will be |
coleenp@4037 | 1305 | // allocated for the metadata. With perm gen the increase in the perm |
coleenp@4037 | 1306 | // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
coleenp@4037 | 1307 | // metaspace policy uses those as the small and large steps for the HWM. |
coleenp@4037 | 1308 | // |
coleenp@4037 | 1309 | // After the GC the compute_new_size() for MetaspaceGC is called to |
coleenp@4037 | 1310 | // resize the capacity of the metaspaces. The current implementation |
coleenp@4037 | 1311 | // is based on the flags MinHeapFreeRatio and MaxHeapFreeRatio used |
coleenp@4037 | 1312 | // to resize the Java heap by some GC's. New flags can be implemented |
coleenp@4037 | 1313 | // if really needed. MinHeapFreeRatio is used to calculate how much |
coleenp@4037 | 1314 | // free space is desirable in the metaspace capacity to decide how much |
coleenp@4037 | 1315 | // to increase the HWM. MaxHeapFreeRatio is used to decide how much |
coleenp@4037 | 1316 | // free space is desirable in the metaspace capacity before decreasing |
coleenp@4037 | 1317 | // the HWM. |
coleenp@4037 | 1318 | |
coleenp@4037 | 1319 | // Calculate the amount to increase the high water mark (HWM). |
coleenp@4037 | 1320 | // Increase by a minimum amount (MinMetaspaceExpansion) so that |
coleenp@4037 | 1321 | // another expansion is not requested too soon. If that is not |
coleenp@4037 | 1322 | // enough to satisfy the allocation (i.e. big enough for a word_size |
coleenp@4037 | 1323 | // allocation), increase by MaxMetaspaceExpansion. If that is still |
coleenp@4037 | 1324 | // not enough, expand by the size of the allocation (word_size) plus |
coleenp@4037 | 1325 | // some. |
coleenp@4037 | 1326 | size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) { |
coleenp@4037 | 1327 | size_t before_inc = MetaspaceGC::capacity_until_GC(); |
coleenp@4037 | 1328 | size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord; |
coleenp@4037 | 1329 | size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord; |
coleenp@4037 | 1330 | size_t page_size_words = os::vm_page_size() / BytesPerWord; |
coleenp@4037 | 1331 | size_t size_delta_words = align_size_up(word_size, page_size_words); |
coleenp@4037 | 1332 | size_t delta_words = MAX2(size_delta_words, min_delta_words); |
coleenp@4037 | 1333 | if (delta_words > min_delta_words) { |
coleenp@4037 | 1334 | // Don't want to hit the high water mark on the next |
coleenp@4037 | 1335 | // allocation so make the delta greater than just enough |
coleenp@4037 | 1336 | // for this allocation. |
coleenp@4037 | 1337 | delta_words = MAX2(delta_words, max_delta_words); |
coleenp@4037 | 1338 | if (delta_words > max_delta_words) { |
coleenp@4037 | 1339 | // This allocation is large but the next ones are probably not |
coleenp@4037 | 1340 | // so increase by the minimum. |
coleenp@4037 | 1341 | delta_words = delta_words + min_delta_words; |
coleenp@4037 | 1342 | } |
coleenp@4037 | 1343 | } |
coleenp@4037 | 1344 | return delta_words; |
coleenp@4037 | 1345 | } |
coleenp@4037 | 1346 | |
coleenp@4037 | 1347 | bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) { |
coleenp@4037 | 1348 | |
coleenp@4037 | 1349 | // Class virtual space should always be expanded. Call GC for the other |
coleenp@4037 | 1350 | // metadata virtual space. |
coleenp@4037 | 1351 | if (vsl == Metaspace::class_space_list()) return true; |
coleenp@4037 | 1352 | |
coleenp@4037 | 1353 | // If the user wants a limit, impose one. |
coleenp@4037 | 1354 | size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord; |
coleenp@4037 | 1355 | size_t metaspace_size_words = MetaspaceSize / BytesPerWord; |
coleenp@4037 | 1356 | if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) && |
coleenp@4037 | 1357 | vsl->capacity_words_sum() >= max_metaspace_size_words) { |
coleenp@4037 | 1358 | return false; |
coleenp@4037 | 1359 | } |
coleenp@4037 | 1360 | |
coleenp@4037 | 1361 | // If this is part of an allocation after a GC, expand |
coleenp@4037 | 1362 | // unconditionally. |
coleenp@4037 | 1363 | if(MetaspaceGC::expand_after_GC()) { |
coleenp@4037 | 1364 | return true; |
coleenp@4037 | 1365 | } |
coleenp@4037 | 1366 | |
coleenp@4037 | 1367 | // If the capacity is below the minimum capacity, allow the |
coleenp@4037 | 1368 | // expansion. Also set the high-water-mark (capacity_until_GC) |
coleenp@4037 | 1369 | // to that minimum capacity so that a GC will not be induced |
coleenp@4037 | 1370 | // until that minimum capacity is exceeded. |
coleenp@4037 | 1371 | if (vsl->capacity_words_sum() < metaspace_size_words || |
coleenp@4037 | 1372 | capacity_until_GC() == 0) { |
coleenp@4037 | 1373 | set_capacity_until_GC(metaspace_size_words); |
coleenp@4037 | 1374 | return true; |
coleenp@4037 | 1375 | } else { |
coleenp@4037 | 1376 | if (vsl->capacity_words_sum() < capacity_until_GC()) { |
coleenp@4037 | 1377 | return true; |
coleenp@4037 | 1378 | } else { |
coleenp@4037 | 1379 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1380 | gclog_or_tty->print_cr(" allocation request size " SIZE_FORMAT |
coleenp@4037 | 1381 | " capacity_until_GC " SIZE_FORMAT |
coleenp@4037 | 1382 | " capacity_words_sum " SIZE_FORMAT |
coleenp@4037 | 1383 | " used_words_sum " SIZE_FORMAT |
coleenp@4037 | 1384 | " free chunks " SIZE_FORMAT |
coleenp@4037 | 1385 | " free chunks count %d", |
coleenp@4037 | 1386 | word_size, |
coleenp@4037 | 1387 | capacity_until_GC(), |
coleenp@4037 | 1388 | vsl->capacity_words_sum(), |
coleenp@4037 | 1389 | vsl->used_words_sum(), |
coleenp@4037 | 1390 | vsl->chunk_manager()->free_chunks_total(), |
coleenp@4037 | 1391 | vsl->chunk_manager()->free_chunks_count()); |
coleenp@4037 | 1392 | } |
coleenp@4037 | 1393 | return false; |
coleenp@4037 | 1394 | } |
coleenp@4037 | 1395 | } |
coleenp@4037 | 1396 | } |
coleenp@4037 | 1397 | |
coleenp@4037 | 1398 | // Variables are in bytes |
coleenp@4037 | 1399 | |
coleenp@4037 | 1400 | void MetaspaceGC::compute_new_size() { |
coleenp@4037 | 1401 | assert(_shrink_factor <= 100, "invalid shrink factor"); |
coleenp@4037 | 1402 | uint current_shrink_factor = _shrink_factor; |
coleenp@4037 | 1403 | _shrink_factor = 0; |
coleenp@4037 | 1404 | |
coleenp@4037 | 1405 | VirtualSpaceList *vsl = Metaspace::space_list(); |
coleenp@4037 | 1406 | |
coleenp@4037 | 1407 | size_t capacity_after_gc = vsl->capacity_bytes_sum(); |
coleenp@4037 | 1408 | // Check to see if these two can be calculated without walking the CLDG |
coleenp@4037 | 1409 | size_t used_after_gc = vsl->used_bytes_sum(); |
coleenp@4037 | 1410 | size_t capacity_until_GC = vsl->capacity_bytes_sum(); |
coleenp@4037 | 1411 | size_t free_after_gc = capacity_until_GC - used_after_gc; |
coleenp@4037 | 1412 | |
coleenp@4037 | 1413 | const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
coleenp@4037 | 1414 | const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
coleenp@4037 | 1415 | |
coleenp@4037 | 1416 | const double min_tmp = used_after_gc / maximum_used_percentage; |
coleenp@4037 | 1417 | size_t minimum_desired_capacity = |
coleenp@4037 | 1418 | (size_t)MIN2(min_tmp, double(max_uintx)); |
coleenp@4037 | 1419 | // Don't shrink less than the initial generation size |
coleenp@4037 | 1420 | minimum_desired_capacity = MAX2(minimum_desired_capacity, |
coleenp@4037 | 1421 | MetaspaceSize); |
coleenp@4037 | 1422 | |
coleenp@4037 | 1423 | if (PrintGCDetails && Verbose) { |
coleenp@4037 | 1424 | const double free_percentage = ((double)free_after_gc) / capacity_until_GC; |
coleenp@4037 | 1425 | gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: "); |
coleenp@4037 | 1426 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1427 | " minimum_free_percentage: %6.2f" |
coleenp@4037 | 1428 | " maximum_used_percentage: %6.2f", |
coleenp@4037 | 1429 | minimum_free_percentage, |
coleenp@4037 | 1430 | maximum_used_percentage); |
coleenp@4037 | 1431 | double d_free_after_gc = free_after_gc / (double) K; |
coleenp@4037 | 1432 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1433 | " free_after_gc : %6.1fK" |
coleenp@4037 | 1434 | " used_after_gc : %6.1fK" |
coleenp@4037 | 1435 | " capacity_after_gc : %6.1fK" |
coleenp@4037 | 1436 | " metaspace HWM : %6.1fK", |
coleenp@4037 | 1437 | free_after_gc / (double) K, |
coleenp@4037 | 1438 | used_after_gc / (double) K, |
coleenp@4037 | 1439 | capacity_after_gc / (double) K, |
coleenp@4037 | 1440 | capacity_until_GC / (double) K); |
coleenp@4037 | 1441 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1442 | " free_percentage: %6.2f", |
coleenp@4037 | 1443 | free_percentage); |
coleenp@4037 | 1444 | } |
coleenp@4037 | 1445 | |
coleenp@4037 | 1446 | |
coleenp@4037 | 1447 | if (capacity_until_GC < minimum_desired_capacity) { |
coleenp@4037 | 1448 | // If we have less capacity below the metaspace HWM, then |
coleenp@4037 | 1449 | // increment the HWM. |
coleenp@4037 | 1450 | size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
coleenp@4037 | 1451 | // Don't expand unless it's significant |
coleenp@4037 | 1452 | if (expand_bytes >= MinMetaspaceExpansion) { |
coleenp@4037 | 1453 | size_t expand_words = expand_bytes / BytesPerWord; |
coleenp@4037 | 1454 | MetaspaceGC::inc_capacity_until_GC(expand_words); |
coleenp@4037 | 1455 | } |
coleenp@4037 | 1456 | if (PrintGCDetails && Verbose) { |
coleenp@4037 | 1457 | size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
coleenp@4037 | 1458 | gclog_or_tty->print_cr(" expanding:" |
coleenp@4037 | 1459 | " minimum_desired_capacity: %6.1fK" |
coleenp@4037 | 1460 | " expand_words: %6.1fK" |
coleenp@4037 | 1461 | " MinMetaspaceExpansion: %6.1fK" |
coleenp@4037 | 1462 | " new metaspace HWM: %6.1fK", |
coleenp@4037 | 1463 | minimum_desired_capacity / (double) K, |
coleenp@4037 | 1464 | expand_bytes / (double) K, |
coleenp@4037 | 1465 | MinMetaspaceExpansion / (double) K, |
coleenp@4037 | 1466 | new_capacity_until_GC / (double) K); |
coleenp@4037 | 1467 | } |
coleenp@4037 | 1468 | return; |
coleenp@4037 | 1469 | } |
coleenp@4037 | 1470 | |
coleenp@4037 | 1471 | // No expansion, now see if we want to shrink |
coleenp@4037 | 1472 | size_t shrink_words = 0; |
coleenp@4037 | 1473 | // We would never want to shrink more than this |
coleenp@4037 | 1474 | size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity; |
coleenp@4037 | 1475 | assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT, |
coleenp@4037 | 1476 | max_shrink_words)); |
coleenp@4037 | 1477 | |
coleenp@4037 | 1478 | // Should shrinking be considered? |
coleenp@4037 | 1479 | if (MaxHeapFreeRatio < 100) { |
coleenp@4037 | 1480 | const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
coleenp@4037 | 1481 | const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
coleenp@4037 | 1482 | const double max_tmp = used_after_gc / minimum_used_percentage; |
coleenp@4037 | 1483 | size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
coleenp@4037 | 1484 | maximum_desired_capacity = MAX2(maximum_desired_capacity, |
coleenp@4037 | 1485 | MetaspaceSize); |
coleenp@4037 | 1486 | if (PrintGC && Verbose) { |
coleenp@4037 | 1487 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1488 | " maximum_free_percentage: %6.2f" |
coleenp@4037 | 1489 | " minimum_used_percentage: %6.2f", |
coleenp@4037 | 1490 | maximum_free_percentage, |
coleenp@4037 | 1491 | minimum_used_percentage); |
coleenp@4037 | 1492 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1493 | " capacity_until_GC: %6.1fK" |
coleenp@4037 | 1494 | " minimum_desired_capacity: %6.1fK" |
coleenp@4037 | 1495 | " maximum_desired_capacity: %6.1fK", |
coleenp@4037 | 1496 | capacity_until_GC / (double) K, |
coleenp@4037 | 1497 | minimum_desired_capacity / (double) K, |
coleenp@4037 | 1498 | maximum_desired_capacity / (double) K); |
coleenp@4037 | 1499 | } |
coleenp@4037 | 1500 | |
coleenp@4037 | 1501 | assert(minimum_desired_capacity <= maximum_desired_capacity, |
coleenp@4037 | 1502 | "sanity check"); |
coleenp@4037 | 1503 | |
coleenp@4037 | 1504 | if (capacity_until_GC > maximum_desired_capacity) { |
coleenp@4037 | 1505 | // Capacity too large, compute shrinking size |
coleenp@4037 | 1506 | shrink_words = capacity_until_GC - maximum_desired_capacity; |
coleenp@4037 | 1507 | // We don't want shrink all the way back to initSize if people call |
coleenp@4037 | 1508 | // System.gc(), because some programs do that between "phases" and then |
coleenp@4037 | 1509 | // we'd just have to grow the heap up again for the next phase. So we |
coleenp@4037 | 1510 | // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
coleenp@4037 | 1511 | // on the third call, and 100% by the fourth call. But if we recompute |
coleenp@4037 | 1512 | // size without shrinking, it goes back to 0%. |
coleenp@4037 | 1513 | shrink_words = shrink_words / 100 * current_shrink_factor; |
coleenp@4037 | 1514 | assert(shrink_words <= max_shrink_words, |
coleenp@4037 | 1515 | err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
coleenp@4037 | 1516 | shrink_words, max_shrink_words)); |
coleenp@4037 | 1517 | if (current_shrink_factor == 0) { |
coleenp@4037 | 1518 | _shrink_factor = 10; |
coleenp@4037 | 1519 | } else { |
coleenp@4037 | 1520 | _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
coleenp@4037 | 1521 | } |
coleenp@4037 | 1522 | if (PrintGCDetails && Verbose) { |
coleenp@4037 | 1523 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1524 | " shrinking:" |
coleenp@4037 | 1525 | " initSize: %.1fK" |
coleenp@4037 | 1526 | " maximum_desired_capacity: %.1fK", |
coleenp@4037 | 1527 | MetaspaceSize / (double) K, |
coleenp@4037 | 1528 | maximum_desired_capacity / (double) K); |
coleenp@4037 | 1529 | gclog_or_tty->print_cr(" " |
coleenp@4037 | 1530 | " shrink_words: %.1fK" |
coleenp@4037 | 1531 | " current_shrink_factor: %d" |
coleenp@4037 | 1532 | " new shrink factor: %d" |
coleenp@4037 | 1533 | " MinMetaspaceExpansion: %.1fK", |
coleenp@4037 | 1534 | shrink_words / (double) K, |
coleenp@4037 | 1535 | current_shrink_factor, |
coleenp@4037 | 1536 | _shrink_factor, |
coleenp@4037 | 1537 | MinMetaspaceExpansion / (double) K); |
coleenp@4037 | 1538 | } |
coleenp@4037 | 1539 | } |
coleenp@4037 | 1540 | } |
coleenp@4037 | 1541 | |
coleenp@4037 | 1542 | |
coleenp@4037 | 1543 | // Don't shrink unless it's significant |
coleenp@4037 | 1544 | if (shrink_words >= MinMetaspaceExpansion) { |
coleenp@4037 | 1545 | VirtualSpaceNode* csp = vsl->current_virtual_space(); |
coleenp@4037 | 1546 | size_t available_to_shrink = csp->capacity_words_in_vs() - |
coleenp@4037 | 1547 | csp->used_words_in_vs(); |
coleenp@4037 | 1548 | shrink_words = MIN2(shrink_words, available_to_shrink); |
coleenp@4037 | 1549 | csp->shrink_by(shrink_words); |
coleenp@4037 | 1550 | MetaspaceGC::dec_capacity_until_GC(shrink_words); |
coleenp@4037 | 1551 | if (PrintGCDetails && Verbose) { |
coleenp@4037 | 1552 | size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes(); |
coleenp@4037 | 1553 | gclog_or_tty->print_cr(" metaspace HWM: %.1fK", new_capacity_until_GC / (double) K); |
coleenp@4037 | 1554 | } |
coleenp@4037 | 1555 | } |
coleenp@4037 | 1556 | assert(vsl->used_bytes_sum() == used_after_gc && |
coleenp@4037 | 1557 | used_after_gc <= vsl->capacity_bytes_sum(), |
coleenp@4037 | 1558 | "sanity check"); |
coleenp@4037 | 1559 | |
coleenp@4037 | 1560 | } |
coleenp@4037 | 1561 | |
coleenp@4037 | 1562 | // Metadebug methods |
coleenp@4037 | 1563 | |
coleenp@4037 | 1564 | void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm, |
coleenp@4037 | 1565 | size_t chunk_word_size){ |
coleenp@4037 | 1566 | #ifdef ASSERT |
coleenp@4037 | 1567 | VirtualSpaceList* vsl = sm->vs_list(); |
coleenp@4037 | 1568 | if (MetaDataDeallocateALot && |
coleenp@4037 | 1569 | Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
coleenp@4037 | 1570 | Metadebug::reset_deallocate_chunk_a_lot_count(); |
coleenp@4037 | 1571 | for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) { |
coleenp@4037 | 1572 | Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size); |
coleenp@4037 | 1573 | if (dummy_chunk == NULL) { |
coleenp@4037 | 1574 | break; |
coleenp@4037 | 1575 | } |
coleenp@4037 | 1576 | vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk); |
coleenp@4037 | 1577 | |
coleenp@4037 | 1578 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1579 | gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ", |
coleenp@4037 | 1580 | sm->sum_count_in_chunks_in_use()); |
coleenp@4037 | 1581 | dummy_chunk->print_on(gclog_or_tty); |
coleenp@4037 | 1582 | gclog_or_tty->print_cr(" Free chunks total %d count %d", |
coleenp@4037 | 1583 | vsl->chunk_manager()->free_chunks_total(), |
coleenp@4037 | 1584 | vsl->chunk_manager()->free_chunks_count()); |
coleenp@4037 | 1585 | } |
coleenp@4037 | 1586 | } |
coleenp@4037 | 1587 | } else { |
coleenp@4037 | 1588 | Metadebug::inc_deallocate_chunk_a_lot_count(); |
coleenp@4037 | 1589 | } |
coleenp@4037 | 1590 | #endif |
coleenp@4037 | 1591 | } |
coleenp@4037 | 1592 | |
coleenp@4037 | 1593 | void Metadebug::deallocate_block_a_lot(SpaceManager* sm, |
coleenp@4037 | 1594 | size_t raw_word_size){ |
coleenp@4037 | 1595 | #ifdef ASSERT |
coleenp@4037 | 1596 | if (MetaDataDeallocateALot && |
coleenp@4037 | 1597 | Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) { |
coleenp@4037 | 1598 | Metadebug::set_deallocate_block_a_lot_count(0); |
coleenp@4037 | 1599 | for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) { |
coleenp@4037 | 1600 | Metablock* dummy_block = sm->allocate_work(raw_word_size); |
coleenp@4037 | 1601 | if (dummy_block == 0) { |
coleenp@4037 | 1602 | break; |
coleenp@4037 | 1603 | } |
coleenp@4037 | 1604 | #ifdef ASSERT |
coleenp@4037 | 1605 | assert(dummy_block->word_size() == raw_word_size, "Block size is not set correctly"); |
coleenp@4037 | 1606 | #endif |
coleenp@4037 | 1607 | sm->deallocate(dummy_block->data()); |
coleenp@4037 | 1608 | } |
coleenp@4037 | 1609 | } else { |
coleenp@4037 | 1610 | Metadebug::inc_deallocate_block_a_lot_count(); |
coleenp@4037 | 1611 | } |
coleenp@4037 | 1612 | #endif |
coleenp@4037 | 1613 | } |
coleenp@4037 | 1614 | |
coleenp@4037 | 1615 | void Metadebug::init_allocation_fail_alot_count() { |
coleenp@4037 | 1616 | if (MetadataAllocationFailALot) { |
coleenp@4037 | 1617 | _allocation_fail_alot_count = |
coleenp@4037 | 1618 | 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
coleenp@4037 | 1619 | } |
coleenp@4037 | 1620 | } |
coleenp@4037 | 1621 | |
coleenp@4037 | 1622 | #ifdef ASSERT |
coleenp@4037 | 1623 | bool Metadebug::test_metadata_failure() { |
coleenp@4037 | 1624 | if (MetadataAllocationFailALot && |
coleenp@4037 | 1625 | Threads::is_vm_complete()) { |
coleenp@4037 | 1626 | if (_allocation_fail_alot_count > 0) { |
coleenp@4037 | 1627 | _allocation_fail_alot_count--; |
coleenp@4037 | 1628 | } else { |
coleenp@4037 | 1629 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1630 | gclog_or_tty->print_cr("Metadata allocation failing for " |
coleenp@4037 | 1631 | "MetadataAllocationFailALot"); |
coleenp@4037 | 1632 | } |
coleenp@4037 | 1633 | init_allocation_fail_alot_count(); |
coleenp@4037 | 1634 | return true; |
coleenp@4037 | 1635 | } |
coleenp@4037 | 1636 | } |
coleenp@4037 | 1637 | return false; |
coleenp@4037 | 1638 | } |
coleenp@4037 | 1639 | #endif |
coleenp@4037 | 1640 | |
coleenp@4037 | 1641 | // ChunkList methods |
coleenp@4037 | 1642 | |
coleenp@4037 | 1643 | size_t ChunkList::sum_list_size() { |
coleenp@4037 | 1644 | size_t result = 0; |
coleenp@4037 | 1645 | Metachunk* cur = head(); |
coleenp@4037 | 1646 | while (cur != NULL) { |
coleenp@4037 | 1647 | result += cur->word_size(); |
coleenp@4037 | 1648 | cur = cur->next(); |
coleenp@4037 | 1649 | } |
coleenp@4037 | 1650 | return result; |
coleenp@4037 | 1651 | } |
coleenp@4037 | 1652 | |
coleenp@4037 | 1653 | size_t ChunkList::sum_list_count() { |
coleenp@4037 | 1654 | size_t result = 0; |
coleenp@4037 | 1655 | Metachunk* cur = head(); |
coleenp@4037 | 1656 | while (cur != NULL) { |
coleenp@4037 | 1657 | result++; |
coleenp@4037 | 1658 | cur = cur->next(); |
coleenp@4037 | 1659 | } |
coleenp@4037 | 1660 | return result; |
coleenp@4037 | 1661 | } |
coleenp@4037 | 1662 | |
coleenp@4037 | 1663 | size_t ChunkList::sum_list_capacity() { |
coleenp@4037 | 1664 | size_t result = 0; |
coleenp@4037 | 1665 | Metachunk* cur = head(); |
coleenp@4037 | 1666 | while (cur != NULL) { |
coleenp@4037 | 1667 | result += cur->capacity_word_size(); |
coleenp@4037 | 1668 | cur = cur->next(); |
coleenp@4037 | 1669 | } |
coleenp@4037 | 1670 | return result; |
coleenp@4037 | 1671 | } |
coleenp@4037 | 1672 | |
coleenp@4037 | 1673 | void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) { |
coleenp@4037 | 1674 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1675 | assert(tail->next() == NULL, "Not the tail"); |
coleenp@4037 | 1676 | |
coleenp@4037 | 1677 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1678 | tty->print("ChunkList::add_at_head: "); |
coleenp@4037 | 1679 | Metachunk* cur = head; |
coleenp@4037 | 1680 | while (cur != NULL) { |
coleenp@4037 | 1681 | tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size()); |
coleenp@4037 | 1682 | cur = cur->next(); |
coleenp@4037 | 1683 | } |
coleenp@4037 | 1684 | tty->print_cr(""); |
coleenp@4037 | 1685 | } |
coleenp@4037 | 1686 | |
coleenp@4037 | 1687 | if (tail != NULL) { |
coleenp@4037 | 1688 | tail->set_next(_head); |
coleenp@4037 | 1689 | } |
coleenp@4037 | 1690 | set_head(head); |
coleenp@4037 | 1691 | } |
coleenp@4037 | 1692 | |
coleenp@4037 | 1693 | void ChunkList::add_at_head(Metachunk* list) { |
coleenp@4037 | 1694 | if (list == NULL) { |
coleenp@4037 | 1695 | // Nothing to add |
coleenp@4037 | 1696 | return; |
coleenp@4037 | 1697 | } |
coleenp@4037 | 1698 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1699 | Metachunk* head = list; |
coleenp@4037 | 1700 | Metachunk* tail = list; |
coleenp@4037 | 1701 | Metachunk* cur = head->next(); |
coleenp@4037 | 1702 | // Search for the tail since it is not passed. |
coleenp@4037 | 1703 | while (cur != NULL) { |
coleenp@4037 | 1704 | tail = cur; |
coleenp@4037 | 1705 | cur = cur->next(); |
coleenp@4037 | 1706 | } |
coleenp@4037 | 1707 | add_at_head(head, tail); |
coleenp@4037 | 1708 | } |
coleenp@4037 | 1709 | |
coleenp@4037 | 1710 | // ChunkManager methods |
coleenp@4037 | 1711 | |
coleenp@4037 | 1712 | // Verification of _free_chunks_total and _free_chunks_count does not |
coleenp@4037 | 1713 | // work with the CMS collector because its use of additional locks |
coleenp@4037 | 1714 | // complicate the mutex deadlock detection but it can still be useful |
coleenp@4037 | 1715 | // for detecting errors in the chunk accounting with other collectors. |
coleenp@4037 | 1716 | |
coleenp@4037 | 1717 | size_t ChunkManager::free_chunks_total() { |
coleenp@4037 | 1718 | #ifdef ASSERT |
coleenp@4037 | 1719 | if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
coleenp@4037 | 1720 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1721 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1722 | locked_verify_free_chunks_total(); |
coleenp@4037 | 1723 | } |
coleenp@4037 | 1724 | #endif |
coleenp@4037 | 1725 | return _free_chunks_total; |
coleenp@4037 | 1726 | } |
coleenp@4037 | 1727 | |
coleenp@4037 | 1728 | size_t ChunkManager::free_chunks_total_in_bytes() { |
coleenp@4037 | 1729 | return free_chunks_total() * BytesPerWord; |
coleenp@4037 | 1730 | } |
coleenp@4037 | 1731 | |
coleenp@4037 | 1732 | size_t ChunkManager::free_chunks_count() { |
coleenp@4037 | 1733 | #ifdef ASSERT |
coleenp@4037 | 1734 | if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
coleenp@4037 | 1735 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1736 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1737 | // This lock is only needed in debug because the verification |
coleenp@4037 | 1738 | // of the _free_chunks_totals walks the list of free chunks |
coleenp@4037 | 1739 | locked_verify_free_chunks_count(); |
coleenp@4037 | 1740 | } |
coleenp@4037 | 1741 | #endif |
coleenp@4037 | 1742 | return _free_chunks_count; |
coleenp@4037 | 1743 | } |
coleenp@4037 | 1744 | |
coleenp@4037 | 1745 | void ChunkManager::locked_verify_free_chunks_total() { |
coleenp@4037 | 1746 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1747 | assert(sum_free_chunks() == _free_chunks_total, |
coleenp@4037 | 1748 | err_msg("_free_chunks_total " SIZE_FORMAT " is not the" |
coleenp@4037 | 1749 | " same as sum " SIZE_FORMAT, _free_chunks_total, |
coleenp@4037 | 1750 | sum_free_chunks())); |
coleenp@4037 | 1751 | } |
coleenp@4037 | 1752 | |
coleenp@4037 | 1753 | void ChunkManager::verify_free_chunks_total() { |
coleenp@4037 | 1754 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1755 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1756 | locked_verify_free_chunks_total(); |
coleenp@4037 | 1757 | } |
coleenp@4037 | 1758 | |
coleenp@4037 | 1759 | void ChunkManager::locked_verify_free_chunks_count() { |
coleenp@4037 | 1760 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1761 | assert(sum_free_chunks_count() == _free_chunks_count, |
coleenp@4037 | 1762 | err_msg("_free_chunks_count " SIZE_FORMAT " is not the" |
coleenp@4037 | 1763 | " same as sum " SIZE_FORMAT, _free_chunks_count, |
coleenp@4037 | 1764 | sum_free_chunks_count())); |
coleenp@4037 | 1765 | } |
coleenp@4037 | 1766 | |
coleenp@4037 | 1767 | void ChunkManager::verify_free_chunks_count() { |
coleenp@4037 | 1768 | #ifdef ASSERT |
coleenp@4037 | 1769 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1770 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1771 | locked_verify_free_chunks_count(); |
coleenp@4037 | 1772 | #endif |
coleenp@4037 | 1773 | } |
coleenp@4037 | 1774 | |
coleenp@4037 | 1775 | void ChunkManager::verify() { |
coleenp@4037 | 1776 | #ifdef ASSERT |
coleenp@4037 | 1777 | if (!UseConcMarkSweepGC) { |
coleenp@4037 | 1778 | MutexLockerEx cl(SpaceManager::expand_lock(), |
coleenp@4037 | 1779 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1780 | locked_verify_free_chunks_total(); |
coleenp@4037 | 1781 | locked_verify_free_chunks_count(); |
coleenp@4037 | 1782 | } |
coleenp@4037 | 1783 | #endif |
coleenp@4037 | 1784 | } |
coleenp@4037 | 1785 | |
coleenp@4037 | 1786 | void ChunkManager::locked_verify() { |
coleenp@4037 | 1787 | locked_verify_free_chunks_total(); |
coleenp@4037 | 1788 | locked_verify_free_chunks_count(); |
coleenp@4037 | 1789 | } |
coleenp@4037 | 1790 | |
coleenp@4037 | 1791 | void ChunkManager::locked_print_free_chunks(outputStream* st) { |
coleenp@4037 | 1792 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1793 | st->print_cr("Free chunk total 0x%x count 0x%x", |
coleenp@4037 | 1794 | _free_chunks_total, _free_chunks_count); |
coleenp@4037 | 1795 | } |
coleenp@4037 | 1796 | |
coleenp@4037 | 1797 | void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
coleenp@4037 | 1798 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1799 | st->print_cr("Sum free chunk total 0x%x count 0x%x", |
coleenp@4037 | 1800 | sum_free_chunks(), sum_free_chunks_count()); |
coleenp@4037 | 1801 | } |
coleenp@4037 | 1802 | ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
coleenp@4037 | 1803 | return &_free_chunks[index]; |
coleenp@4037 | 1804 | } |
coleenp@4037 | 1805 | |
coleenp@4037 | 1806 | |
coleenp@4037 | 1807 | // These methods that sum the free chunk lists are used in printing |
coleenp@4037 | 1808 | // methods that are used in product builds. |
coleenp@4037 | 1809 | size_t ChunkManager::sum_free_chunks() { |
coleenp@4037 | 1810 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1811 | size_t result = 0; |
coleenp@4037 | 1812 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 1813 | ChunkList* list = free_chunks(i); |
coleenp@4037 | 1814 | |
coleenp@4037 | 1815 | if (list == NULL) { |
coleenp@4037 | 1816 | continue; |
coleenp@4037 | 1817 | } |
coleenp@4037 | 1818 | |
coleenp@4037 | 1819 | result = result + list->sum_list_capacity(); |
coleenp@4037 | 1820 | } |
coleenp@4037 | 1821 | return result; |
coleenp@4037 | 1822 | } |
coleenp@4037 | 1823 | |
coleenp@4037 | 1824 | size_t ChunkManager::sum_free_chunks_count() { |
coleenp@4037 | 1825 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1826 | size_t count = 0; |
coleenp@4037 | 1827 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 1828 | ChunkList* list = free_chunks(i); |
coleenp@4037 | 1829 | if (list == NULL) { |
coleenp@4037 | 1830 | continue; |
coleenp@4037 | 1831 | } |
coleenp@4037 | 1832 | count = count + list->sum_list_count(); |
coleenp@4037 | 1833 | } |
coleenp@4037 | 1834 | return count; |
coleenp@4037 | 1835 | } |
coleenp@4037 | 1836 | |
coleenp@4037 | 1837 | ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
coleenp@4037 | 1838 | switch (word_size) { |
coleenp@4037 | 1839 | case SpaceManager::SmallChunk : |
coleenp@4037 | 1840 | return &_free_chunks[0]; |
coleenp@4037 | 1841 | case SpaceManager::MediumChunk : |
coleenp@4037 | 1842 | return &_free_chunks[1]; |
coleenp@4037 | 1843 | default: |
coleenp@4037 | 1844 | assert(word_size > SpaceManager::MediumChunk, "List inconsistency"); |
coleenp@4037 | 1845 | return &_free_chunks[2]; |
coleenp@4037 | 1846 | } |
coleenp@4037 | 1847 | } |
coleenp@4037 | 1848 | |
coleenp@4037 | 1849 | void ChunkManager::free_chunks_put(Metachunk* chunk) { |
coleenp@4037 | 1850 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1851 | ChunkList* free_list = find_free_chunks_list(chunk->word_size()); |
coleenp@4037 | 1852 | chunk->set_next(free_list->head()); |
coleenp@4037 | 1853 | free_list->set_head(chunk); |
coleenp@4037 | 1854 | // chunk is being returned to the chunk free list |
coleenp@4037 | 1855 | inc_free_chunks_total(chunk->capacity_word_size()); |
coleenp@4037 | 1856 | locked_verify(); |
coleenp@4037 | 1857 | } |
coleenp@4037 | 1858 | |
coleenp@4037 | 1859 | void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) { |
coleenp@4037 | 1860 | // The deallocation of a chunk originates in the freelist |
coleenp@4037 | 1861 | // manangement code for a Metaspace and does not hold the |
coleenp@4037 | 1862 | // lock. |
coleenp@4037 | 1863 | assert(chunk != NULL, "Deallocating NULL"); |
coleenp@4037 | 1864 | // MutexLockerEx fcl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 1865 | locked_verify(); |
coleenp@4037 | 1866 | if (TraceMetadataChunkAllocation) { |
coleenp@4037 | 1867 | tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk " |
coleenp@4037 | 1868 | PTR_FORMAT " size " SIZE_FORMAT, |
coleenp@4037 | 1869 | chunk, chunk->word_size()); |
coleenp@4037 | 1870 | } |
coleenp@4037 | 1871 | free_chunks_put(chunk); |
coleenp@4037 | 1872 | } |
coleenp@4037 | 1873 | |
coleenp@4037 | 1874 | Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
coleenp@4037 | 1875 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1876 | |
coleenp@4037 | 1877 | locked_verify(); |
coleenp@4037 | 1878 | ChunkList* free_list = find_free_chunks_list(word_size); |
coleenp@4037 | 1879 | assert(free_list != NULL, "Sanity check"); |
coleenp@4037 | 1880 | |
coleenp@4037 | 1881 | Metachunk* chunk = free_list->head(); |
coleenp@4037 | 1882 | debug_only(Metachunk* debug_head = chunk;) |
coleenp@4037 | 1883 | |
coleenp@4037 | 1884 | if (chunk == NULL) { |
coleenp@4037 | 1885 | return NULL; |
coleenp@4037 | 1886 | } |
coleenp@4037 | 1887 | |
coleenp@4037 | 1888 | Metachunk* prev_chunk = chunk; |
coleenp@4037 | 1889 | if (chunk->word_size() == word_size) { |
coleenp@4037 | 1890 | // Chunk is being removed from the chunks free list. |
coleenp@4037 | 1891 | dec_free_chunks_total(chunk->capacity_word_size()); |
coleenp@4037 | 1892 | // Remove the chunk as the head of the list. |
coleenp@4037 | 1893 | free_list->set_head(chunk->next()); |
coleenp@4037 | 1894 | chunk->set_next(NULL); |
coleenp@4037 | 1895 | |
coleenp@4037 | 1896 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 1897 | tty->print_cr("ChunkManager::free_chunks_get: free_list " |
coleenp@4037 | 1898 | PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
coleenp@4037 | 1899 | free_list, chunk, chunk->word_size()); |
coleenp@4037 | 1900 | } |
coleenp@4037 | 1901 | } else { |
coleenp@4037 | 1902 | assert(SpaceManager::is_humongous(word_size), |
coleenp@4037 | 1903 | "Should only need to check humongous"); |
coleenp@4037 | 1904 | // This code to find the best fit is just for purposes of |
coleenp@4037 | 1905 | // investigating the loss due to fragmentation on a humongous |
coleenp@4037 | 1906 | // chunk. It will be replace by a binaryTreeDictionary for |
coleenp@4037 | 1907 | // the humongous chunks. |
coleenp@4037 | 1908 | uint count = 0; |
coleenp@4037 | 1909 | Metachunk* best_fit = NULL; |
coleenp@4037 | 1910 | Metachunk* best_fit_prev = NULL; |
coleenp@4037 | 1911 | while (chunk != NULL) { |
coleenp@4037 | 1912 | count++; |
coleenp@4037 | 1913 | if (chunk->word_size() < word_size) { |
coleenp@4037 | 1914 | prev_chunk = chunk; |
coleenp@4037 | 1915 | chunk = chunk->next(); |
coleenp@4037 | 1916 | } else if (chunk->word_size() == word_size) { |
coleenp@4037 | 1917 | break; |
coleenp@4037 | 1918 | } else { |
coleenp@4037 | 1919 | if (best_fit == NULL || |
coleenp@4037 | 1920 | best_fit->word_size() > chunk->word_size()) { |
coleenp@4037 | 1921 | best_fit_prev = prev_chunk; |
coleenp@4037 | 1922 | best_fit = chunk; |
coleenp@4037 | 1923 | } |
coleenp@4037 | 1924 | prev_chunk = chunk; |
coleenp@4037 | 1925 | chunk = chunk->next(); |
coleenp@4037 | 1926 | } |
coleenp@4037 | 1927 | } |
coleenp@4037 | 1928 | if (chunk == NULL) { |
coleenp@4037 | 1929 | prev_chunk = best_fit_prev; |
coleenp@4037 | 1930 | chunk = best_fit; |
coleenp@4037 | 1931 | } |
coleenp@4037 | 1932 | if (chunk != NULL) { |
coleenp@4037 | 1933 | if (TraceMetadataHumongousAllocation) { |
coleenp@4037 | 1934 | size_t waste = chunk->word_size() - word_size; |
coleenp@4037 | 1935 | tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT |
coleenp@4037 | 1936 | " for requested size " SIZE_FORMAT |
coleenp@4037 | 1937 | " waste " SIZE_FORMAT |
coleenp@4037 | 1938 | " found at " SIZE_FORMAT " of " SIZE_FORMAT, |
coleenp@4037 | 1939 | chunk->word_size(), word_size, waste, |
coleenp@4037 | 1940 | count, free_list->sum_list_count()); |
coleenp@4037 | 1941 | } |
coleenp@4037 | 1942 | // Chunk is being removed from the chunks free list. |
coleenp@4037 | 1943 | dec_free_chunks_total(chunk->capacity_word_size()); |
coleenp@4037 | 1944 | // Remove the chunk if it is at the head of the list. |
coleenp@4037 | 1945 | if (chunk == free_list->head()) { |
coleenp@4037 | 1946 | free_list->set_head(chunk->next()); |
coleenp@4037 | 1947 | |
coleenp@4037 | 1948 | if (TraceMetadataHumongousAllocation) { |
coleenp@4037 | 1949 | tty->print_cr("ChunkManager::free_chunks_get: humongous free_list " |
coleenp@4037 | 1950 | PTR_FORMAT " chunk " PTR_FORMAT " size " SIZE_FORMAT |
coleenp@4037 | 1951 | " new head " PTR_FORMAT, |
coleenp@4037 | 1952 | free_list, chunk, chunk->word_size(), |
coleenp@4037 | 1953 | free_list->head()); |
coleenp@4037 | 1954 | } |
coleenp@4037 | 1955 | } else { |
coleenp@4037 | 1956 | // Remove a chunk in the interior of the list |
coleenp@4037 | 1957 | prev_chunk->set_next(chunk->next()); |
coleenp@4037 | 1958 | |
coleenp@4037 | 1959 | if (TraceMetadataHumongousAllocation) { |
coleenp@4037 | 1960 | tty->print_cr("ChunkManager::free_chunks_get: humongous free_list " |
coleenp@4037 | 1961 | PTR_FORMAT " chunk " PTR_FORMAT " size " SIZE_FORMAT |
coleenp@4037 | 1962 | PTR_FORMAT " prev " PTR_FORMAT " next " PTR_FORMAT, |
coleenp@4037 | 1963 | free_list, chunk, chunk->word_size(), |
coleenp@4037 | 1964 | prev_chunk, chunk->next()); |
coleenp@4037 | 1965 | } |
coleenp@4037 | 1966 | } |
coleenp@4037 | 1967 | chunk->set_next(NULL); |
coleenp@4037 | 1968 | } else { |
coleenp@4037 | 1969 | if (TraceMetadataHumongousAllocation) { |
coleenp@4037 | 1970 | tty->print_cr("ChunkManager::free_chunks_get: New humongous chunk of size " |
coleenp@4037 | 1971 | SIZE_FORMAT, |
coleenp@4037 | 1972 | word_size); |
coleenp@4037 | 1973 | } |
coleenp@4037 | 1974 | } |
coleenp@4037 | 1975 | } |
coleenp@4037 | 1976 | locked_verify(); |
coleenp@4037 | 1977 | return chunk; |
coleenp@4037 | 1978 | } |
coleenp@4037 | 1979 | |
coleenp@4037 | 1980 | Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
coleenp@4037 | 1981 | assert_lock_strong(SpaceManager::expand_lock()); |
coleenp@4037 | 1982 | locked_verify(); |
coleenp@4037 | 1983 | |
coleenp@4037 | 1984 | // Take from the beginning of the list |
coleenp@4037 | 1985 | Metachunk* chunk = free_chunks_get(word_size); |
coleenp@4037 | 1986 | if (chunk == NULL) { |
coleenp@4037 | 1987 | return NULL; |
coleenp@4037 | 1988 | } |
coleenp@4037 | 1989 | |
coleenp@4037 | 1990 | assert(word_size <= chunk->word_size() || |
coleenp@4037 | 1991 | SpaceManager::is_humongous(chunk->word_size()), |
coleenp@4037 | 1992 | "Non-humongous variable sized chunk"); |
coleenp@4037 | 1993 | if (TraceMetadataChunkAllocation) { |
coleenp@4037 | 1994 | tty->print("ChunkManager::chunk_freelist_allocate: chunk " |
coleenp@4037 | 1995 | PTR_FORMAT " size " SIZE_FORMAT " ", |
coleenp@4037 | 1996 | chunk, chunk->word_size()); |
coleenp@4037 | 1997 | locked_print_free_chunks(tty); |
coleenp@4037 | 1998 | } |
coleenp@4037 | 1999 | |
coleenp@4037 | 2000 | return chunk; |
coleenp@4037 | 2001 | } |
coleenp@4037 | 2002 | |
coleenp@4037 | 2003 | // SpaceManager methods |
coleenp@4037 | 2004 | |
coleenp@4037 | 2005 | size_t SpaceManager::sum_free_in_chunks_in_use() const { |
coleenp@4037 | 2006 | MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2007 | size_t free = 0; |
coleenp@4037 | 2008 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2009 | Metachunk* chunk = chunks_in_use(i); |
coleenp@4037 | 2010 | while (chunk != NULL) { |
coleenp@4037 | 2011 | free += chunk->free_word_size(); |
coleenp@4037 | 2012 | chunk = chunk->next(); |
coleenp@4037 | 2013 | } |
coleenp@4037 | 2014 | } |
coleenp@4037 | 2015 | return free; |
coleenp@4037 | 2016 | } |
coleenp@4037 | 2017 | |
coleenp@4037 | 2018 | size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
coleenp@4037 | 2019 | MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2020 | size_t result = 0; |
coleenp@4037 | 2021 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2022 | // Count the free space in all the chunk but not the |
coleenp@4037 | 2023 | // current chunk from which allocations are still being done. |
coleenp@4037 | 2024 | result += sum_waste_in_chunks_in_use(i); |
coleenp@4037 | 2025 | } |
coleenp@4037 | 2026 | return result; |
coleenp@4037 | 2027 | } |
coleenp@4037 | 2028 | |
coleenp@4037 | 2029 | size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
coleenp@4037 | 2030 | size_t result = 0; |
coleenp@4037 | 2031 | size_t count = 0; |
coleenp@4037 | 2032 | Metachunk* chunk = chunks_in_use(index); |
coleenp@4037 | 2033 | // Count the free space in all the chunk but not the |
coleenp@4037 | 2034 | // current chunk from which allocations are still being done. |
coleenp@4037 | 2035 | if (chunk != NULL) { |
coleenp@4037 | 2036 | while (chunk != NULL) { |
coleenp@4037 | 2037 | if (chunk != current_chunk()) { |
coleenp@4037 | 2038 | result += chunk->free_word_size(); |
coleenp@4037 | 2039 | } |
coleenp@4037 | 2040 | chunk = chunk->next(); |
coleenp@4037 | 2041 | count++; |
coleenp@4037 | 2042 | } |
coleenp@4037 | 2043 | } |
coleenp@4037 | 2044 | return result; |
coleenp@4037 | 2045 | } |
coleenp@4037 | 2046 | |
coleenp@4037 | 2047 | size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
coleenp@4037 | 2048 | MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2049 | size_t sum = 0; |
coleenp@4037 | 2050 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2051 | Metachunk* chunk = chunks_in_use(i); |
coleenp@4037 | 2052 | while (chunk != NULL) { |
coleenp@4037 | 2053 | // Just changed this sum += chunk->capacity_word_size(); |
coleenp@4037 | 2054 | // sum += chunk->word_size() - Metachunk::overhead(); |
coleenp@4037 | 2055 | sum += chunk->capacity_word_size(); |
coleenp@4037 | 2056 | chunk = chunk->next(); |
coleenp@4037 | 2057 | } |
coleenp@4037 | 2058 | } |
coleenp@4037 | 2059 | return sum; |
coleenp@4037 | 2060 | } |
coleenp@4037 | 2061 | |
coleenp@4037 | 2062 | size_t SpaceManager::sum_count_in_chunks_in_use() { |
coleenp@4037 | 2063 | size_t count = 0; |
coleenp@4037 | 2064 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2065 | count = count + sum_count_in_chunks_in_use(i); |
coleenp@4037 | 2066 | } |
coleenp@4037 | 2067 | return count; |
coleenp@4037 | 2068 | } |
coleenp@4037 | 2069 | |
coleenp@4037 | 2070 | size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
coleenp@4037 | 2071 | size_t count = 0; |
coleenp@4037 | 2072 | Metachunk* chunk = chunks_in_use(i); |
coleenp@4037 | 2073 | while (chunk != NULL) { |
coleenp@4037 | 2074 | count++; |
coleenp@4037 | 2075 | chunk = chunk->next(); |
coleenp@4037 | 2076 | } |
coleenp@4037 | 2077 | return count; |
coleenp@4037 | 2078 | } |
coleenp@4037 | 2079 | |
coleenp@4037 | 2080 | |
coleenp@4037 | 2081 | size_t SpaceManager::sum_used_in_chunks_in_use() const { |
coleenp@4037 | 2082 | MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2083 | size_t used = 0; |
coleenp@4037 | 2084 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2085 | Metachunk* chunk = chunks_in_use(i); |
coleenp@4037 | 2086 | while (chunk != NULL) { |
coleenp@4037 | 2087 | used += chunk->used_word_size(); |
coleenp@4037 | 2088 | chunk = chunk->next(); |
coleenp@4037 | 2089 | } |
coleenp@4037 | 2090 | } |
coleenp@4037 | 2091 | return used; |
coleenp@4037 | 2092 | } |
coleenp@4037 | 2093 | |
coleenp@4037 | 2094 | void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
coleenp@4037 | 2095 | |
coleenp@4037 | 2096 | Metachunk* small_chunk = chunks_in_use(SmallIndex); |
coleenp@4037 | 2097 | st->print_cr("SpaceManager: small chunk " PTR_FORMAT |
coleenp@4037 | 2098 | " free " SIZE_FORMAT, |
coleenp@4037 | 2099 | small_chunk, |
coleenp@4037 | 2100 | small_chunk->free_word_size()); |
coleenp@4037 | 2101 | |
coleenp@4037 | 2102 | Metachunk* medium_chunk = chunks_in_use(MediumIndex); |
coleenp@4037 | 2103 | st->print("medium chunk " PTR_FORMAT, medium_chunk); |
coleenp@4037 | 2104 | Metachunk* tail = current_chunk(); |
coleenp@4037 | 2105 | st->print_cr(" current chunk " PTR_FORMAT, tail); |
coleenp@4037 | 2106 | |
coleenp@4037 | 2107 | Metachunk* head = chunks_in_use(HumongousIndex); |
coleenp@4037 | 2108 | st->print_cr("humongous chunk " PTR_FORMAT, head); |
coleenp@4037 | 2109 | |
coleenp@4037 | 2110 | vs_list()->chunk_manager()->locked_print_free_chunks(st); |
coleenp@4037 | 2111 | vs_list()->chunk_manager()->locked_print_sum_free_chunks(st); |
coleenp@4037 | 2112 | } |
coleenp@4037 | 2113 | |
coleenp@4037 | 2114 | size_t SpaceManager::calc_chunk_size(size_t word_size) { |
coleenp@4037 | 2115 | |
coleenp@4037 | 2116 | // Decide between a small chunk and a medium chunk. Up to |
coleenp@4037 | 2117 | // _small_chunk_limit small chunks can be allocated but |
coleenp@4037 | 2118 | // once a medium chunk has been allocated, no more small |
coleenp@4037 | 2119 | // chunks will be allocated. |
coleenp@4037 | 2120 | size_t chunk_word_size; |
coleenp@4037 | 2121 | if (chunks_in_use(MediumIndex) == NULL && |
coleenp@4037 | 2122 | (!has_small_chunk_limit() || |
coleenp@4037 | 2123 | sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) { |
coleenp@4037 | 2124 | chunk_word_size = (size_t) SpaceManager::SmallChunk; |
coleenp@4037 | 2125 | if (word_size + Metachunk::overhead() > SpaceManager::SmallChunk) { |
coleenp@4037 | 2126 | chunk_word_size = MediumChunk; |
coleenp@4037 | 2127 | } |
coleenp@4037 | 2128 | } else { |
coleenp@4037 | 2129 | chunk_word_size = MediumChunk; |
coleenp@4037 | 2130 | } |
coleenp@4037 | 2131 | |
coleenp@4037 | 2132 | // Might still need a humongous chunk |
coleenp@4037 | 2133 | chunk_word_size = |
coleenp@4037 | 2134 | MAX2((size_t) chunk_word_size, word_size + Metachunk::overhead()); |
coleenp@4037 | 2135 | |
coleenp@4037 | 2136 | if (TraceMetadataHumongousAllocation && |
coleenp@4037 | 2137 | SpaceManager::is_humongous(word_size)) { |
coleenp@4037 | 2138 | gclog_or_tty->print_cr("Metadata humongous allocation:"); |
coleenp@4037 | 2139 | gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size); |
coleenp@4037 | 2140 | gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT, |
coleenp@4037 | 2141 | chunk_word_size); |
coleenp@4037 | 2142 | gclog_or_tty->print_cr(" block overhead " PTR_FORMAT |
coleenp@4037 | 2143 | " chunk overhead " PTR_FORMAT, |
coleenp@4037 | 2144 | Metablock::overhead(), |
coleenp@4037 | 2145 | Metachunk::overhead()); |
coleenp@4037 | 2146 | } |
coleenp@4037 | 2147 | return chunk_word_size; |
coleenp@4037 | 2148 | } |
coleenp@4037 | 2149 | |
coleenp@4037 | 2150 | Metablock* SpaceManager::grow_and_allocate(size_t word_size) { |
coleenp@4037 | 2151 | assert(vs_list()->current_virtual_space() != NULL, |
coleenp@4037 | 2152 | "Should have been set"); |
coleenp@4037 | 2153 | assert(current_chunk() == NULL || |
coleenp@4037 | 2154 | current_chunk()->allocate(word_size) == NULL, |
coleenp@4037 | 2155 | "Don't need to expand"); |
coleenp@4037 | 2156 | MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2157 | |
coleenp@4037 | 2158 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 2159 | gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT |
coleenp@4037 | 2160 | " words " SIZE_FORMAT " space left", |
coleenp@4037 | 2161 | word_size, current_chunk() != NULL ? |
coleenp@4037 | 2162 | current_chunk()->free_word_size() : 0); |
coleenp@4037 | 2163 | } |
coleenp@4037 | 2164 | |
coleenp@4037 | 2165 | // Get another chunk out of the virtual space |
coleenp@4037 | 2166 | size_t grow_chunks_by_words = calc_chunk_size(word_size); |
coleenp@4037 | 2167 | Metachunk* next = vs_list()->get_new_chunk(word_size, grow_chunks_by_words); |
coleenp@4037 | 2168 | |
coleenp@4037 | 2169 | // If a chunk was available, add it to the in-use chunk list |
coleenp@4037 | 2170 | // and do an allocation from it. |
coleenp@4037 | 2171 | if (next != NULL) { |
coleenp@4037 | 2172 | Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words); |
coleenp@4037 | 2173 | // Add to this manager's list of chunks in use. |
coleenp@4037 | 2174 | add_chunk(next, false); |
coleenp@4037 | 2175 | return next->allocate(word_size); |
coleenp@4037 | 2176 | } |
coleenp@4037 | 2177 | return NULL; |
coleenp@4037 | 2178 | } |
coleenp@4037 | 2179 | |
coleenp@4037 | 2180 | void SpaceManager::print_on(outputStream* st) const { |
coleenp@4037 | 2181 | |
coleenp@4037 | 2182 | for (ChunkIndex i = SmallIndex; |
coleenp@4037 | 2183 | i < NumberOfFreeLists ; |
coleenp@4037 | 2184 | i = next_chunk_index(i) ) { |
coleenp@4037 | 2185 | st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT, |
coleenp@4037 | 2186 | chunks_in_use(i), |
coleenp@4037 | 2187 | chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
coleenp@4037 | 2188 | } |
coleenp@4037 | 2189 | st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
coleenp@4037 | 2190 | " Humongous " SIZE_FORMAT, |
coleenp@4037 | 2191 | sum_waste_in_chunks_in_use(SmallIndex), |
coleenp@4037 | 2192 | sum_waste_in_chunks_in_use(MediumIndex), |
coleenp@4037 | 2193 | sum_waste_in_chunks_in_use(HumongousIndex)); |
coleenp@4037 | 2194 | // Nothing in them yet |
coleenp@4037 | 2195 | // block_freelists()->print_on(st); |
coleenp@4037 | 2196 | } |
coleenp@4037 | 2197 | |
coleenp@4037 | 2198 | SpaceManager::SpaceManager(Mutex* lock, VirtualSpaceList* vs_list) : |
coleenp@4037 | 2199 | _vs_list(vs_list), |
coleenp@4037 | 2200 | _allocation_total(0), |
coleenp@4037 | 2201 | _lock(lock) { |
coleenp@4037 | 2202 | Metadebug::init_allocation_fail_alot_count(); |
coleenp@4037 | 2203 | for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2204 | _chunks_in_use[i] = NULL; |
coleenp@4037 | 2205 | } |
coleenp@4037 | 2206 | _current_chunk = NULL; |
coleenp@4037 | 2207 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 2208 | gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this); |
coleenp@4037 | 2209 | } |
coleenp@4037 | 2210 | } |
coleenp@4037 | 2211 | |
coleenp@4037 | 2212 | SpaceManager::~SpaceManager() { |
coleenp@4037 | 2213 | MutexLockerEx fcl(SpaceManager::expand_lock(), |
coleenp@4037 | 2214 | Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2215 | |
coleenp@4037 | 2216 | ChunkManager* chunk_manager = vs_list()->chunk_manager(); |
coleenp@4037 | 2217 | |
coleenp@4037 | 2218 | chunk_manager->locked_verify(); |
coleenp@4037 | 2219 | |
coleenp@4037 | 2220 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 2221 | gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this); |
coleenp@4037 | 2222 | locked_print_chunks_in_use_on(gclog_or_tty); |
coleenp@4037 | 2223 | } |
coleenp@4037 | 2224 | |
coleenp@4037 | 2225 | // Have to update before the chunks_in_use lists are emptied |
coleenp@4037 | 2226 | // below. |
coleenp@4037 | 2227 | chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(), |
coleenp@4037 | 2228 | sum_count_in_chunks_in_use()); |
coleenp@4037 | 2229 | |
coleenp@4037 | 2230 | #ifdef ASSERT |
coleenp@4037 | 2231 | // Mangle freed memory. |
coleenp@4037 | 2232 | mangle_freed_chunks(); |
coleenp@4037 | 2233 | #endif // ASSERT |
coleenp@4037 | 2234 | |
coleenp@4037 | 2235 | // Add all the chunks in use by this space manager |
coleenp@4037 | 2236 | // to the global list of free chunks. |
coleenp@4037 | 2237 | |
coleenp@4037 | 2238 | // Small chunks. There is one _current_chunk for each |
coleenp@4037 | 2239 | // Metaspace. It could point to a small or medium chunk. |
coleenp@4037 | 2240 | // Rather than determine which it is, follow the list of |
coleenp@4037 | 2241 | // small chunks to add them to the free list |
coleenp@4037 | 2242 | Metachunk* small_chunk = chunks_in_use(SmallIndex); |
coleenp@4037 | 2243 | chunk_manager->free_small_chunks()->add_at_head(small_chunk); |
coleenp@4037 | 2244 | set_chunks_in_use(SmallIndex, NULL); |
coleenp@4037 | 2245 | |
coleenp@4037 | 2246 | // After the small chunk are the medium chunks |
coleenp@4037 | 2247 | Metachunk* medium_chunk = chunks_in_use(MediumIndex); |
coleenp@4037 | 2248 | assert(medium_chunk == NULL || |
coleenp@4037 | 2249 | medium_chunk->word_size() == MediumChunk, |
coleenp@4037 | 2250 | "Chunk is on the wrong list"); |
coleenp@4037 | 2251 | |
coleenp@4037 | 2252 | if (medium_chunk != NULL) { |
coleenp@4037 | 2253 | Metachunk* head = medium_chunk; |
coleenp@4037 | 2254 | // If there is a medium chunk then the _current_chunk can only |
coleenp@4037 | 2255 | // point to the last medium chunk. |
coleenp@4037 | 2256 | Metachunk* tail = current_chunk(); |
coleenp@4037 | 2257 | chunk_manager->free_medium_chunks()->add_at_head(head, tail); |
coleenp@4037 | 2258 | set_chunks_in_use(MediumIndex, NULL); |
coleenp@4037 | 2259 | } |
coleenp@4037 | 2260 | |
coleenp@4037 | 2261 | // Humongous chunks |
coleenp@4037 | 2262 | // Humongous chunks are never the current chunk. |
coleenp@4037 | 2263 | Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
coleenp@4037 | 2264 | |
coleenp@4037 | 2265 | if (humongous_chunks != NULL) { |
coleenp@4037 | 2266 | chunk_manager->free_humongous_chunks()->add_at_head(humongous_chunks); |
coleenp@4037 | 2267 | set_chunks_in_use(HumongousIndex, NULL); |
coleenp@4037 | 2268 | } |
coleenp@4037 | 2269 | chunk_manager->locked_verify(); |
coleenp@4037 | 2270 | } |
coleenp@4037 | 2271 | |
coleenp@4037 | 2272 | void SpaceManager::deallocate(MetaWord* p) { |
coleenp@4037 | 2273 | assert_lock_strong(_lock); |
coleenp@4037 | 2274 | ShouldNotReachHere(); // Where is this needed. |
coleenp@4037 | 2275 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 2276 | Metablock* block = Metablock::metablock_from_data(p); |
coleenp@4037 | 2277 | // This is expense but kept it until integration JJJ |
coleenp@4037 | 2278 | assert(contains((address)block), "Block does not belong to this metaspace"); |
coleenp@4037 | 2279 | block_freelists()->return_block(block, word_size); |
coleenp@4037 | 2280 | #endif |
coleenp@4037 | 2281 | } |
coleenp@4037 | 2282 | |
coleenp@4037 | 2283 | // Adds a chunk to the list of chunks in use. |
coleenp@4037 | 2284 | void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
coleenp@4037 | 2285 | |
coleenp@4037 | 2286 | assert(new_chunk != NULL, "Should not be NULL"); |
coleenp@4037 | 2287 | assert(new_chunk->next() == NULL, "Should not be on a list"); |
coleenp@4037 | 2288 | |
coleenp@4037 | 2289 | new_chunk->reset_empty(); |
coleenp@4037 | 2290 | |
coleenp@4037 | 2291 | // Find the correct list and and set the current |
coleenp@4037 | 2292 | // chunk for that list. |
coleenp@4037 | 2293 | switch (new_chunk->word_size()) { |
coleenp@4037 | 2294 | case SpaceManager::SmallChunk : |
coleenp@4037 | 2295 | if (chunks_in_use(SmallIndex) == NULL) { |
coleenp@4037 | 2296 | // First chunk to add to the list |
coleenp@4037 | 2297 | set_chunks_in_use(SmallIndex, new_chunk); |
coleenp@4037 | 2298 | } else { |
coleenp@4037 | 2299 | assert(current_chunk()->word_size() == SpaceManager::SmallChunk, |
coleenp@4037 | 2300 | err_msg( "Incorrect mix of sizes in chunk list " |
coleenp@4037 | 2301 | SIZE_FORMAT " new chunk " SIZE_FORMAT, |
coleenp@4037 | 2302 | current_chunk()->word_size(), new_chunk->word_size())); |
coleenp@4037 | 2303 | current_chunk()->set_next(new_chunk); |
coleenp@4037 | 2304 | } |
coleenp@4037 | 2305 | // Make current chunk |
coleenp@4037 | 2306 | set_current_chunk(new_chunk); |
coleenp@4037 | 2307 | break; |
coleenp@4037 | 2308 | case SpaceManager::MediumChunk : |
coleenp@4037 | 2309 | if (chunks_in_use(MediumIndex) == NULL) { |
coleenp@4037 | 2310 | // About to add the first medium chunk so teminate the |
coleenp@4037 | 2311 | // small chunk list. In general once medium chunks are |
coleenp@4037 | 2312 | // being added, we're past the need for small chunks. |
coleenp@4037 | 2313 | if (current_chunk() != NULL) { |
coleenp@4037 | 2314 | // Only a small chunk or the initial chunk could be |
coleenp@4037 | 2315 | // the current chunk if this is the first medium chunk. |
coleenp@4037 | 2316 | assert(current_chunk()->word_size() == SpaceManager::SmallChunk || |
coleenp@4037 | 2317 | chunks_in_use(SmallIndex) == NULL, |
coleenp@4037 | 2318 | err_msg("Should be a small chunk or initial chunk, current chunk " |
coleenp@4037 | 2319 | SIZE_FORMAT " new chunk " SIZE_FORMAT, |
coleenp@4037 | 2320 | current_chunk()->word_size(), new_chunk->word_size())); |
coleenp@4037 | 2321 | current_chunk()->set_next(NULL); |
coleenp@4037 | 2322 | } |
coleenp@4037 | 2323 | // First chunk to add to the list |
coleenp@4037 | 2324 | set_chunks_in_use(MediumIndex, new_chunk); |
coleenp@4037 | 2325 | |
coleenp@4037 | 2326 | } else { |
coleenp@4037 | 2327 | // As a minimum the first medium chunk added would |
coleenp@4037 | 2328 | // have become the _current_chunk |
coleenp@4037 | 2329 | // so the _current_chunk has to be non-NULL here |
coleenp@4037 | 2330 | // (although not necessarily still the first medium chunk). |
coleenp@4037 | 2331 | assert(current_chunk()->word_size() == SpaceManager::MediumChunk, |
coleenp@4037 | 2332 | "A medium chunk should the current chunk"); |
coleenp@4037 | 2333 | current_chunk()->set_next(new_chunk); |
coleenp@4037 | 2334 | } |
coleenp@4037 | 2335 | // Make current chunk |
coleenp@4037 | 2336 | set_current_chunk(new_chunk); |
coleenp@4037 | 2337 | break; |
coleenp@4037 | 2338 | default: { |
coleenp@4037 | 2339 | // For null class loader data and DumpSharedSpaces, the first chunk isn't |
coleenp@4037 | 2340 | // small, so small will be null. Link this first chunk as the current |
coleenp@4037 | 2341 | // chunk. |
coleenp@4037 | 2342 | if (make_current) { |
coleenp@4037 | 2343 | // Set as the current chunk but otherwise treat as a humongous chunk. |
coleenp@4037 | 2344 | set_current_chunk(new_chunk); |
coleenp@4037 | 2345 | } |
coleenp@4037 | 2346 | // Link at head. The _current_chunk only points to a humongous chunk for |
coleenp@4037 | 2347 | // the null class loader metaspace (class and data virtual space managers) |
coleenp@4037 | 2348 | // any humongous chunks so will not point to the tail |
coleenp@4037 | 2349 | // of the humongous chunks list. |
coleenp@4037 | 2350 | new_chunk->set_next(chunks_in_use(HumongousIndex)); |
coleenp@4037 | 2351 | set_chunks_in_use(HumongousIndex, new_chunk); |
coleenp@4037 | 2352 | |
coleenp@4037 | 2353 | assert(new_chunk->word_size() > MediumChunk, "List inconsistency"); |
coleenp@4037 | 2354 | } |
coleenp@4037 | 2355 | } |
coleenp@4037 | 2356 | |
coleenp@4037 | 2357 | assert(new_chunk->is_empty(), "Not ready for reuse"); |
coleenp@4037 | 2358 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 2359 | gclog_or_tty->print("SpaceManager::add_chunk: %d) ", |
coleenp@4037 | 2360 | sum_count_in_chunks_in_use()); |
coleenp@4037 | 2361 | new_chunk->print_on(gclog_or_tty); |
coleenp@4037 | 2362 | vs_list()->chunk_manager()->locked_print_free_chunks(tty); |
coleenp@4037 | 2363 | } |
coleenp@4037 | 2364 | } |
coleenp@4037 | 2365 | |
coleenp@4037 | 2366 | MetaWord* SpaceManager::allocate(size_t word_size) { |
coleenp@4037 | 2367 | MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2368 | |
coleenp@4037 | 2369 | size_t block_overhead = Metablock::overhead(); |
coleenp@4037 | 2370 | // If only the dictionary is going to be used (i.e., no |
coleenp@4037 | 2371 | // indexed free list), then there is a minimum size requirement. |
coleenp@4037 | 2372 | // MinChunkSize is a placeholder for the real minimum size JJJ |
coleenp@4037 | 2373 | size_t byte_size_with_overhead = (word_size + block_overhead) * BytesPerWord; |
coleenp@4037 | 2374 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 2375 | size_t raw_bytes_size = MAX2(ARENA_ALIGN(byte_size_with_overhead), |
coleenp@4037 | 2376 | MinChunkSize * BytesPerWord); |
coleenp@4037 | 2377 | #else |
coleenp@4037 | 2378 | size_t raw_bytes_size = ARENA_ALIGN(byte_size_with_overhead); |
coleenp@4037 | 2379 | #endif |
coleenp@4037 | 2380 | size_t raw_word_size = raw_bytes_size / BytesPerWord; |
coleenp@4037 | 2381 | assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
coleenp@4037 | 2382 | |
coleenp@4037 | 2383 | BlockFreelist* fl = block_freelists(); |
coleenp@4037 | 2384 | Metablock* block = NULL; |
coleenp@4037 | 2385 | // Allocation from the dictionary is expensive in the sense that |
coleenp@4037 | 2386 | // the dictionary has to be searched for a size. Don't allocate |
coleenp@4037 | 2387 | // from the dictionary until it starts to get fat. Is this |
coleenp@4037 | 2388 | // a reasonable policy? Maybe an skinny dictionary is fast enough |
coleenp@4037 | 2389 | // for allocations. Do some profiling. JJJ |
coleenp@4037 | 2390 | if (fl->totalSize() > allocation_from_dictionary_limit) { |
coleenp@4037 | 2391 | block = fl->get_block(raw_word_size); |
coleenp@4037 | 2392 | } |
coleenp@4037 | 2393 | if (block == NULL) { |
coleenp@4037 | 2394 | block = allocate_work(raw_word_size); |
coleenp@4037 | 2395 | if (block == NULL) { |
coleenp@4037 | 2396 | return NULL; |
coleenp@4037 | 2397 | } |
coleenp@4037 | 2398 | } |
coleenp@4037 | 2399 | Metadebug::deallocate_block_a_lot(this, raw_word_size); |
coleenp@4037 | 2400 | |
coleenp@4037 | 2401 | // Push the allocation past the word containing the size and leader. |
coleenp@4037 | 2402 | #ifdef ASSERT |
coleenp@4037 | 2403 | MetaWord* result = block->data(); |
coleenp@4037 | 2404 | return result; |
coleenp@4037 | 2405 | #else |
coleenp@4037 | 2406 | return (MetaWord*) block; |
coleenp@4037 | 2407 | #endif |
coleenp@4037 | 2408 | } |
coleenp@4037 | 2409 | |
coleenp@4037 | 2410 | // Returns the address of spaced allocated for "word_size". |
coleenp@4037 | 2411 | // This methods does not know about blocks (Metablocks) |
coleenp@4037 | 2412 | Metablock* SpaceManager::allocate_work(size_t word_size) { |
coleenp@4037 | 2413 | assert_lock_strong(_lock); |
coleenp@4037 | 2414 | #ifdef ASSERT |
coleenp@4037 | 2415 | if (Metadebug::test_metadata_failure()) { |
coleenp@4037 | 2416 | return NULL; |
coleenp@4037 | 2417 | } |
coleenp@4037 | 2418 | #endif |
coleenp@4037 | 2419 | // Is there space in the current chunk? |
coleenp@4037 | 2420 | Metablock* result = NULL; |
coleenp@4037 | 2421 | |
coleenp@4037 | 2422 | // For DumpSharedSpaces, only allocate out of the current chunk which is |
coleenp@4037 | 2423 | // never null because we gave it the size we wanted. Caller reports out |
coleenp@4037 | 2424 | // of memory if this returns null. |
coleenp@4037 | 2425 | if (DumpSharedSpaces) { |
coleenp@4037 | 2426 | assert(current_chunk() != NULL, "should never happen"); |
coleenp@4037 | 2427 | inc_allocation_total(word_size); |
coleenp@4037 | 2428 | return current_chunk()->allocate(word_size); // caller handles null result |
coleenp@4037 | 2429 | } |
coleenp@4037 | 2430 | if (current_chunk() != NULL) { |
coleenp@4037 | 2431 | result = current_chunk()->allocate(word_size); |
coleenp@4037 | 2432 | } |
coleenp@4037 | 2433 | |
coleenp@4037 | 2434 | if (result == NULL) { |
coleenp@4037 | 2435 | result = grow_and_allocate(word_size); |
coleenp@4037 | 2436 | } |
coleenp@4037 | 2437 | if (result > 0) { |
coleenp@4037 | 2438 | inc_allocation_total(word_size); |
coleenp@4037 | 2439 | assert(result != (Metablock*) chunks_in_use(MediumIndex), "Head of the list is being allocated"); |
coleenp@4037 | 2440 | assert(result->word_size() == word_size, "Size not set correctly"); |
coleenp@4037 | 2441 | } |
coleenp@4037 | 2442 | |
coleenp@4037 | 2443 | return result; |
coleenp@4037 | 2444 | } |
coleenp@4037 | 2445 | |
coleenp@4037 | 2446 | void SpaceManager::verify() { |
coleenp@4037 | 2447 | // If there are blocks in the dictionary, then |
coleenp@4037 | 2448 | // verfication of chunks does not work since |
coleenp@4037 | 2449 | // being in the dictionary alters a chunk. |
coleenp@4037 | 2450 | if (block_freelists()->totalSize() == 0) { |
coleenp@4037 | 2451 | // Skip the small chunks because their next link points to |
coleenp@4037 | 2452 | // medium chunks. This is because the small chunk is the |
coleenp@4037 | 2453 | // current chunk (for allocations) until it is full and the |
coleenp@4037 | 2454 | // the addition of the next chunk does not NULL the next |
coleenp@4037 | 2455 | // like of the small chunk. |
coleenp@4037 | 2456 | for (ChunkIndex i = MediumIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
coleenp@4037 | 2457 | Metachunk* curr = chunks_in_use(i); |
coleenp@4037 | 2458 | while (curr != NULL) { |
coleenp@4037 | 2459 | curr->verify(); |
coleenp@4037 | 2460 | curr = curr->next(); |
coleenp@4037 | 2461 | } |
coleenp@4037 | 2462 | } |
coleenp@4037 | 2463 | } |
coleenp@4037 | 2464 | } |
coleenp@4037 | 2465 | |
coleenp@4037 | 2466 | #ifdef ASSERT |
coleenp@4037 | 2467 | void SpaceManager::verify_allocation_total() { |
coleenp@4037 | 2468 | #if 0 |
coleenp@4037 | 2469 | // Verification is only guaranteed at a safepoint. |
coleenp@4037 | 2470 | if (SafepointSynchronize::is_at_safepoint()) { |
coleenp@4037 | 2471 | gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT |
coleenp@4037 | 2472 | " sum_used_in_chunks_in_use " SIZE_FORMAT, |
coleenp@4037 | 2473 | this, |
coleenp@4037 | 2474 | allocation_total(), |
coleenp@4037 | 2475 | sum_used_in_chunks_in_use()); |
coleenp@4037 | 2476 | } |
coleenp@4037 | 2477 | MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2478 | assert(allocation_total() == sum_used_in_chunks_in_use(), |
coleenp@4037 | 2479 | err_msg("allocation total is not consistent %d vs %d", |
coleenp@4037 | 2480 | allocation_total(), sum_used_in_chunks_in_use())); |
coleenp@4037 | 2481 | #endif |
coleenp@4037 | 2482 | } |
coleenp@4037 | 2483 | |
coleenp@4037 | 2484 | #endif |
coleenp@4037 | 2485 | |
coleenp@4037 | 2486 | void SpaceManager::dump(outputStream* const out) const { |
coleenp@4037 | 2487 | size_t curr_total = 0; |
coleenp@4037 | 2488 | size_t waste = 0; |
coleenp@4037 | 2489 | uint i = 0; |
coleenp@4037 | 2490 | size_t used = 0; |
coleenp@4037 | 2491 | size_t capacity = 0; |
coleenp@4037 | 2492 | |
coleenp@4037 | 2493 | // Add up statistics for all chunks in this SpaceManager. |
coleenp@4037 | 2494 | for (ChunkIndex index = SmallIndex; |
coleenp@4037 | 2495 | index < NumberOfFreeLists; |
coleenp@4037 | 2496 | index = next_chunk_index(index)) { |
coleenp@4037 | 2497 | for (Metachunk* curr = chunks_in_use(index); |
coleenp@4037 | 2498 | curr != NULL; |
coleenp@4037 | 2499 | curr = curr->next()) { |
coleenp@4037 | 2500 | out->print("%d) ", i++); |
coleenp@4037 | 2501 | curr->print_on(out); |
coleenp@4037 | 2502 | if (TraceMetadataChunkAllocation && Verbose) { |
coleenp@4037 | 2503 | block_freelists()->print_on(out); |
coleenp@4037 | 2504 | } |
coleenp@4037 | 2505 | curr_total += curr->word_size(); |
coleenp@4037 | 2506 | used += curr->used_word_size(); |
coleenp@4037 | 2507 | capacity += curr->capacity_word_size(); |
coleenp@4037 | 2508 | waste += curr->free_word_size() + curr->overhead();; |
coleenp@4037 | 2509 | } |
coleenp@4037 | 2510 | } |
coleenp@4037 | 2511 | |
coleenp@4037 | 2512 | size_t free = current_chunk()->free_word_size(); |
coleenp@4037 | 2513 | // Free space isn't wasted. |
coleenp@4037 | 2514 | waste -= free; |
coleenp@4037 | 2515 | |
coleenp@4037 | 2516 | out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
coleenp@4037 | 2517 | " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
coleenp@4037 | 2518 | " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
coleenp@4037 | 2519 | } |
coleenp@4037 | 2520 | |
coleenp@4037 | 2521 | #ifndef PRODUCT |
coleenp@4037 | 2522 | void SpaceManager::mangle_freed_chunks() { |
coleenp@4037 | 2523 | for (ChunkIndex index = SmallIndex; |
coleenp@4037 | 2524 | index < NumberOfFreeLists; |
coleenp@4037 | 2525 | index = next_chunk_index(index)) { |
coleenp@4037 | 2526 | for (Metachunk* curr = chunks_in_use(index); |
coleenp@4037 | 2527 | curr != NULL; |
coleenp@4037 | 2528 | curr = curr->next()) { |
coleenp@4037 | 2529 | // Try to detect incorrectly terminated small chunk |
coleenp@4037 | 2530 | // list. |
coleenp@4037 | 2531 | assert(index == MediumIndex || curr != chunks_in_use(MediumIndex), |
coleenp@4037 | 2532 | err_msg("Mangling medium chunks in small chunks? " |
coleenp@4037 | 2533 | "curr " PTR_FORMAT " medium list " PTR_FORMAT, |
coleenp@4037 | 2534 | curr, chunks_in_use(MediumIndex))); |
coleenp@4037 | 2535 | curr->mangle(); |
coleenp@4037 | 2536 | } |
coleenp@4037 | 2537 | } |
coleenp@4037 | 2538 | } |
coleenp@4037 | 2539 | #endif // PRODUCT |
coleenp@4037 | 2540 | |
coleenp@4037 | 2541 | |
coleenp@4037 | 2542 | // MetaspaceAux |
coleenp@4037 | 2543 | |
coleenp@4037 | 2544 | size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2545 | size_t used = 0; |
coleenp@4037 | 2546 | #ifdef ASSERT |
coleenp@4037 | 2547 | size_t free = 0; |
coleenp@4037 | 2548 | size_t capacity = 0; |
coleenp@4037 | 2549 | #endif |
coleenp@4037 | 2550 | ClassLoaderDataGraphMetaspaceIterator iter; |
coleenp@4037 | 2551 | while (iter.repeat()) { |
coleenp@4037 | 2552 | Metaspace* msp = iter.get_next(); |
coleenp@4037 | 2553 | // Sum allocation_total for each metaspace |
coleenp@4037 | 2554 | if (msp != NULL) { |
coleenp@4037 | 2555 | used += msp->used_words(mdtype); |
coleenp@4037 | 2556 | #ifdef ASSERT |
coleenp@4037 | 2557 | free += msp->free_words(mdtype); |
coleenp@4037 | 2558 | capacity += msp->capacity_words(mdtype); |
coleenp@4037 | 2559 | assert(used + free == capacity, |
coleenp@4037 | 2560 | err_msg("Accounting is wrong used " SIZE_FORMAT |
coleenp@4037 | 2561 | " free " SIZE_FORMAT " capacity " SIZE_FORMAT, |
coleenp@4037 | 2562 | used, free, capacity)); |
coleenp@4037 | 2563 | #endif |
coleenp@4037 | 2564 | } |
coleenp@4037 | 2565 | } |
coleenp@4037 | 2566 | return used * BytesPerWord; |
coleenp@4037 | 2567 | } |
coleenp@4037 | 2568 | |
coleenp@4037 | 2569 | size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2570 | size_t free = 0; |
coleenp@4037 | 2571 | ClassLoaderDataGraphMetaspaceIterator iter; |
coleenp@4037 | 2572 | while (iter.repeat()) { |
coleenp@4037 | 2573 | Metaspace* msp = iter.get_next(); |
coleenp@4037 | 2574 | if (msp != NULL) { |
coleenp@4037 | 2575 | free += msp->free_words(mdtype); |
coleenp@4037 | 2576 | } |
coleenp@4037 | 2577 | } |
coleenp@4037 | 2578 | return free * BytesPerWord; |
coleenp@4037 | 2579 | } |
coleenp@4037 | 2580 | |
coleenp@4037 | 2581 | // The total words available for metadata allocation. This |
coleenp@4037 | 2582 | // uses Metaspace capacity_words() which is the total words |
coleenp@4037 | 2583 | // in chunks allocated for a Metaspace. |
coleenp@4037 | 2584 | size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2585 | size_t capacity = free_chunks_total(mdtype); |
coleenp@4037 | 2586 | ClassLoaderDataGraphMetaspaceIterator iter; |
coleenp@4037 | 2587 | while (iter.repeat()) { |
coleenp@4037 | 2588 | Metaspace* msp = iter.get_next(); |
coleenp@4037 | 2589 | if (msp != NULL) { |
coleenp@4037 | 2590 | capacity += msp->capacity_words(mdtype); |
coleenp@4037 | 2591 | } |
coleenp@4037 | 2592 | } |
coleenp@4037 | 2593 | return capacity * BytesPerWord; |
coleenp@4037 | 2594 | } |
coleenp@4037 | 2595 | |
coleenp@4037 | 2596 | size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2597 | size_t reserved = (mdtype == Metaspace::ClassType) ? |
coleenp@4037 | 2598 | Metaspace::class_space_list()->virtual_space_total() : |
coleenp@4037 | 2599 | Metaspace::space_list()->virtual_space_total(); |
coleenp@4037 | 2600 | return reserved * BytesPerWord; |
coleenp@4037 | 2601 | } |
coleenp@4037 | 2602 | |
coleenp@4037 | 2603 | size_t MetaspaceAux::min_chunk_size() { return SpaceManager::MediumChunk; } |
coleenp@4037 | 2604 | |
coleenp@4037 | 2605 | size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2606 | ChunkManager* chunk = (mdtype == Metaspace::ClassType) ? |
coleenp@4037 | 2607 | Metaspace::class_space_list()->chunk_manager() : |
coleenp@4037 | 2608 | Metaspace::space_list()->chunk_manager(); |
coleenp@4037 | 2609 | |
coleenp@4037 | 2610 | chunk->verify_free_chunks_total(); |
coleenp@4037 | 2611 | return chunk->free_chunks_total(); |
coleenp@4037 | 2612 | } |
coleenp@4037 | 2613 | |
coleenp@4037 | 2614 | size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2615 | return free_chunks_total(mdtype) * BytesPerWord; |
coleenp@4037 | 2616 | } |
coleenp@4037 | 2617 | |
coleenp@4037 | 2618 | void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
coleenp@4037 | 2619 | gclog_or_tty->print(", [Metaspace:"); |
coleenp@4037 | 2620 | if (PrintGCDetails && Verbose) { |
coleenp@4037 | 2621 | gclog_or_tty->print(" " SIZE_FORMAT |
coleenp@4037 | 2622 | "->" SIZE_FORMAT |
coleenp@4037 | 2623 | "(" SIZE_FORMAT "/" SIZE_FORMAT ")", |
coleenp@4037 | 2624 | prev_metadata_used, |
coleenp@4037 | 2625 | used_in_bytes(), |
coleenp@4037 | 2626 | capacity_in_bytes(), |
coleenp@4037 | 2627 | reserved_in_bytes()); |
coleenp@4037 | 2628 | } else { |
coleenp@4037 | 2629 | gclog_or_tty->print(" " SIZE_FORMAT "K" |
coleenp@4037 | 2630 | "->" SIZE_FORMAT "K" |
coleenp@4037 | 2631 | "(" SIZE_FORMAT "K/" SIZE_FORMAT "K)", |
coleenp@4037 | 2632 | prev_metadata_used / K, |
coleenp@4037 | 2633 | used_in_bytes()/ K, |
coleenp@4037 | 2634 | capacity_in_bytes()/K, |
coleenp@4037 | 2635 | reserved_in_bytes()/ K); |
coleenp@4037 | 2636 | } |
coleenp@4037 | 2637 | |
coleenp@4037 | 2638 | gclog_or_tty->print("]"); |
coleenp@4037 | 2639 | } |
coleenp@4037 | 2640 | |
coleenp@4037 | 2641 | // This is printed when PrintGCDetails |
coleenp@4037 | 2642 | void MetaspaceAux::print_on(outputStream* out) { |
coleenp@4037 | 2643 | Metaspace::MetadataType ct = Metaspace::ClassType; |
coleenp@4037 | 2644 | Metaspace::MetadataType nct = Metaspace::NonClassType; |
coleenp@4037 | 2645 | |
coleenp@4037 | 2646 | out->print_cr(" Metaspace total " |
coleenp@4037 | 2647 | SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
coleenp@4037 | 2648 | " reserved " SIZE_FORMAT "K", |
coleenp@4037 | 2649 | capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K); |
coleenp@4037 | 2650 | out->print_cr(" data space " |
coleenp@4037 | 2651 | SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
coleenp@4037 | 2652 | " reserved " SIZE_FORMAT "K", |
coleenp@4037 | 2653 | capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K); |
coleenp@4037 | 2654 | out->print_cr(" class space " |
coleenp@4037 | 2655 | SIZE_FORMAT "K, used " SIZE_FORMAT "K," |
coleenp@4037 | 2656 | " reserved " SIZE_FORMAT "K", |
coleenp@4037 | 2657 | capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_bytes(ct)/K); |
coleenp@4037 | 2658 | } |
coleenp@4037 | 2659 | |
coleenp@4037 | 2660 | // Print information for class space and data space separately. |
coleenp@4037 | 2661 | // This is almost the same as above. |
coleenp@4037 | 2662 | void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
coleenp@4037 | 2663 | size_t free_chunks_capacity_bytes = free_chunks_total_in_bytes(mdtype); |
coleenp@4037 | 2664 | size_t capacity_bytes = capacity_in_bytes(mdtype); |
coleenp@4037 | 2665 | size_t used_bytes = used_in_bytes(mdtype); |
coleenp@4037 | 2666 | size_t free_bytes = free_in_bytes(mdtype); |
coleenp@4037 | 2667 | size_t used_and_free = used_bytes + free_bytes + |
coleenp@4037 | 2668 | free_chunks_capacity_bytes; |
coleenp@4037 | 2669 | out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
coleenp@4037 | 2670 | "K + unused in chunks " SIZE_FORMAT "K + " |
coleenp@4037 | 2671 | " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
coleenp@4037 | 2672 | "K capacity in allocated chunks " SIZE_FORMAT "K", |
coleenp@4037 | 2673 | used_bytes / K, |
coleenp@4037 | 2674 | free_bytes / K, |
coleenp@4037 | 2675 | free_chunks_capacity_bytes / K, |
coleenp@4037 | 2676 | used_and_free / K, |
coleenp@4037 | 2677 | capacity_bytes / K); |
coleenp@4037 | 2678 | assert(used_and_free == capacity_bytes, "Accounting is wrong"); |
coleenp@4037 | 2679 | } |
coleenp@4037 | 2680 | |
coleenp@4037 | 2681 | // Print total fragmentation for class and data metaspaces separately |
coleenp@4037 | 2682 | void MetaspaceAux::print_waste(outputStream* out) { |
coleenp@4037 | 2683 | |
coleenp@4037 | 2684 | size_t small_waste = 0, medium_waste = 0, large_waste = 0; |
coleenp@4037 | 2685 | size_t cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0; |
coleenp@4037 | 2686 | |
coleenp@4037 | 2687 | ClassLoaderDataGraphMetaspaceIterator iter; |
coleenp@4037 | 2688 | while (iter.repeat()) { |
coleenp@4037 | 2689 | Metaspace* msp = iter.get_next(); |
coleenp@4037 | 2690 | if (msp != NULL) { |
coleenp@4037 | 2691 | small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
coleenp@4037 | 2692 | medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
coleenp@4037 | 2693 | large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
coleenp@4037 | 2694 | |
coleenp@4037 | 2695 | cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
coleenp@4037 | 2696 | cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
coleenp@4037 | 2697 | cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex); |
coleenp@4037 | 2698 | } |
coleenp@4037 | 2699 | } |
coleenp@4037 | 2700 | out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
coleenp@4037 | 2701 | out->print(" data: small " SIZE_FORMAT " medium " SIZE_FORMAT, |
coleenp@4037 | 2702 | small_waste, medium_waste); |
coleenp@4037 | 2703 | out->print_cr(" class: small " SIZE_FORMAT, cls_small_waste); |
coleenp@4037 | 2704 | } |
coleenp@4037 | 2705 | |
coleenp@4037 | 2706 | // Dump global metaspace things from the end of ClassLoaderDataGraph |
coleenp@4037 | 2707 | void MetaspaceAux::dump(outputStream* out) { |
coleenp@4037 | 2708 | out->print_cr("All Metaspace:"); |
coleenp@4037 | 2709 | out->print("data space: "); print_on(out, Metaspace::NonClassType); |
coleenp@4037 | 2710 | out->print("class space: "); print_on(out, Metaspace::ClassType); |
coleenp@4037 | 2711 | print_waste(out); |
coleenp@4037 | 2712 | } |
coleenp@4037 | 2713 | |
coleenp@4037 | 2714 | // Metaspace methods |
coleenp@4037 | 2715 | |
coleenp@4037 | 2716 | size_t Metaspace::_first_chunk_word_size = 0; |
coleenp@4037 | 2717 | |
coleenp@4037 | 2718 | Metaspace::Metaspace(Mutex* lock, size_t word_size) { |
coleenp@4037 | 2719 | initialize(lock, word_size); |
coleenp@4037 | 2720 | } |
coleenp@4037 | 2721 | |
coleenp@4037 | 2722 | Metaspace::Metaspace(Mutex* lock) { |
coleenp@4037 | 2723 | initialize(lock); |
coleenp@4037 | 2724 | } |
coleenp@4037 | 2725 | |
coleenp@4037 | 2726 | Metaspace::~Metaspace() { |
coleenp@4037 | 2727 | delete _vsm; |
coleenp@4037 | 2728 | delete _class_vsm; |
coleenp@4037 | 2729 | } |
coleenp@4037 | 2730 | |
coleenp@4037 | 2731 | VirtualSpaceList* Metaspace::_space_list = NULL; |
coleenp@4037 | 2732 | VirtualSpaceList* Metaspace::_class_space_list = NULL; |
coleenp@4037 | 2733 | |
coleenp@4037 | 2734 | #define VIRTUALSPACEMULTIPLIER 2 |
coleenp@4037 | 2735 | |
coleenp@4037 | 2736 | void Metaspace::global_initialize() { |
coleenp@4037 | 2737 | // Initialize the alignment for shared spaces. |
coleenp@4037 | 2738 | int max_alignment = os::vm_page_size(); |
coleenp@4037 | 2739 | MetaspaceShared::set_max_alignment(max_alignment); |
coleenp@4037 | 2740 | |
coleenp@4037 | 2741 | if (DumpSharedSpaces) { |
coleenp@4037 | 2742 | SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
coleenp@4037 | 2743 | SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
coleenp@4037 | 2744 | SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
coleenp@4037 | 2745 | SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
coleenp@4037 | 2746 | |
coleenp@4037 | 2747 | // Initialize with the sum of the shared space sizes. The read-only |
coleenp@4037 | 2748 | // and read write metaspace chunks will be allocated out of this and the |
coleenp@4037 | 2749 | // remainder is the misc code and data chunks. |
coleenp@4037 | 2750 | size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
coleenp@4037 | 2751 | SharedMiscDataSize + SharedMiscCodeSize, |
coleenp@4037 | 2752 | os::vm_allocation_granularity()); |
coleenp@4037 | 2753 | size_t word_size = total/wordSize; |
coleenp@4037 | 2754 | _space_list = new VirtualSpaceList(word_size); |
coleenp@4037 | 2755 | } else { |
coleenp@4037 | 2756 | // If using shared space, open the file that contains the shared space |
coleenp@4037 | 2757 | // and map in the memory before initializing the rest of metaspace (so |
coleenp@4037 | 2758 | // the addresses don't conflict) |
coleenp@4037 | 2759 | if (UseSharedSpaces) { |
coleenp@4037 | 2760 | FileMapInfo* mapinfo = new FileMapInfo(); |
coleenp@4037 | 2761 | memset(mapinfo, 0, sizeof(FileMapInfo)); |
coleenp@4037 | 2762 | |
coleenp@4037 | 2763 | // Open the shared archive file, read and validate the header. If |
coleenp@4037 | 2764 | // initialization fails, shared spaces [UseSharedSpaces] are |
coleenp@4037 | 2765 | // disabled and the file is closed. |
coleenp@4037 | 2766 | // Map in spaces now also |
coleenp@4037 | 2767 | if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
coleenp@4037 | 2768 | FileMapInfo::set_current_info(mapinfo); |
coleenp@4037 | 2769 | } else { |
coleenp@4037 | 2770 | assert(!mapinfo->is_open() && !UseSharedSpaces, |
coleenp@4037 | 2771 | "archive file not closed or shared spaces not disabled."); |
coleenp@4037 | 2772 | } |
coleenp@4037 | 2773 | } |
coleenp@4037 | 2774 | |
coleenp@4037 | 2775 | // Initialize this before initializing the VirtualSpaceList |
coleenp@4037 | 2776 | _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
coleenp@4037 | 2777 | // Arbitrarily set the initial virtual space to a multiple |
coleenp@4037 | 2778 | // of the boot class loader size. |
coleenp@4037 | 2779 | size_t word_size = VIRTUALSPACEMULTIPLIER * Metaspace::first_chunk_word_size(); |
coleenp@4037 | 2780 | // Initialize the list of virtual spaces. |
coleenp@4037 | 2781 | _space_list = new VirtualSpaceList(word_size); |
coleenp@4037 | 2782 | } |
coleenp@4037 | 2783 | } |
coleenp@4037 | 2784 | |
coleenp@4037 | 2785 | // For UseCompressedKlassPointers the class space is reserved as a piece of the |
coleenp@4037 | 2786 | // Java heap because the compression algorithm is the same for each. The |
coleenp@4037 | 2787 | // argument passed in is at the top of the compressed space |
coleenp@4037 | 2788 | void Metaspace::initialize_class_space(ReservedSpace rs) { |
coleenp@4037 | 2789 | // The reserved space size may be bigger because of alignment, esp with UseLargePages |
coleenp@4037 | 2790 | assert(rs.size() >= ClassMetaspaceSize, err_msg("%d != %d", rs.size(), ClassMetaspaceSize)); |
coleenp@4037 | 2791 | _class_space_list = new VirtualSpaceList(rs); |
coleenp@4037 | 2792 | } |
coleenp@4037 | 2793 | |
coleenp@4037 | 2794 | // Class space probably needs a lot less than data space |
coleenp@4037 | 2795 | const int class_space_divisor = 4; |
coleenp@4037 | 2796 | |
coleenp@4037 | 2797 | void Metaspace::initialize(Mutex* lock, size_t initial_size) { |
coleenp@4037 | 2798 | // Use SmallChunk size if not specified, adjust class to smaller size if so. |
coleenp@4037 | 2799 | size_t word_size; |
coleenp@4037 | 2800 | size_t class_word_size; |
coleenp@4037 | 2801 | if (initial_size == 0) { |
coleenp@4037 | 2802 | word_size = (size_t) SpaceManager::SmallChunk; |
coleenp@4037 | 2803 | class_word_size = word_size; |
coleenp@4037 | 2804 | } else { |
coleenp@4037 | 2805 | word_size = initial_size; |
coleenp@4037 | 2806 | class_word_size = initial_size/class_space_divisor; |
coleenp@4037 | 2807 | } |
coleenp@4037 | 2808 | |
coleenp@4037 | 2809 | assert(space_list() != NULL, |
coleenp@4037 | 2810 | "Metadata VirtualSpaceList has not been initialized"); |
coleenp@4037 | 2811 | |
coleenp@4037 | 2812 | _vsm = new SpaceManager(lock, space_list()); |
coleenp@4037 | 2813 | if (_vsm == NULL) { |
coleenp@4037 | 2814 | return; |
coleenp@4037 | 2815 | } |
coleenp@4037 | 2816 | |
coleenp@4037 | 2817 | assert(class_space_list() != NULL, |
coleenp@4037 | 2818 | "Class VirtualSpaceList has not been initialized"); |
coleenp@4037 | 2819 | |
coleenp@4037 | 2820 | // Allocate SpaceManager for classes. |
coleenp@4037 | 2821 | _class_vsm = new SpaceManager(lock, class_space_list()); |
coleenp@4037 | 2822 | if (_class_vsm == NULL) { |
coleenp@4037 | 2823 | return; |
coleenp@4037 | 2824 | } |
coleenp@4037 | 2825 | |
coleenp@4037 | 2826 | MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2827 | |
coleenp@4037 | 2828 | // Allocate chunk for metadata objects |
coleenp@4037 | 2829 | Metachunk* new_chunk = |
coleenp@4037 | 2830 | space_list()->current_virtual_space()->get_chunk_vs_with_expand(word_size); |
coleenp@4037 | 2831 | assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks"); |
coleenp@4037 | 2832 | if (new_chunk != NULL) { |
coleenp@4037 | 2833 | // Add to this manager's list of chunks in use and current_chunk(). |
coleenp@4037 | 2834 | vsm()->add_chunk(new_chunk, true); |
coleenp@4037 | 2835 | } |
coleenp@4037 | 2836 | |
coleenp@4037 | 2837 | // Allocate chunk for class metadata objects |
coleenp@4037 | 2838 | Metachunk* class_chunk = |
coleenp@4037 | 2839 | class_space_list()->current_virtual_space()->get_chunk_vs_with_expand(class_word_size); |
coleenp@4037 | 2840 | if (class_chunk != NULL) { |
coleenp@4037 | 2841 | class_vsm()->add_chunk(class_chunk, true); |
coleenp@4037 | 2842 | } |
coleenp@4037 | 2843 | } |
coleenp@4037 | 2844 | |
coleenp@4037 | 2845 | |
coleenp@4037 | 2846 | MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
coleenp@4037 | 2847 | // DumpSharedSpaces doesn't use class metadata area (yet) |
coleenp@4037 | 2848 | if (mdtype == ClassType && !DumpSharedSpaces) { |
coleenp@4037 | 2849 | return class_vsm()->allocate(word_size); |
coleenp@4037 | 2850 | } else { |
coleenp@4037 | 2851 | return vsm()->allocate(word_size); |
coleenp@4037 | 2852 | } |
coleenp@4037 | 2853 | } |
coleenp@4037 | 2854 | |
coleenp@4037 | 2855 | // Space allocated in the Metaspace. This may |
coleenp@4037 | 2856 | // be across several metadata virtual spaces. |
coleenp@4037 | 2857 | char* Metaspace::bottom() const { |
coleenp@4037 | 2858 | assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); |
coleenp@4037 | 2859 | return (char*)vsm()->current_chunk()->bottom(); |
coleenp@4037 | 2860 | } |
coleenp@4037 | 2861 | |
coleenp@4037 | 2862 | size_t Metaspace::used_words(MetadataType mdtype) const { |
coleenp@4037 | 2863 | // return vsm()->allocation_total(); |
coleenp@4037 | 2864 | return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() : |
coleenp@4037 | 2865 | vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
coleenp@4037 | 2866 | } |
coleenp@4037 | 2867 | |
coleenp@4037 | 2868 | size_t Metaspace::free_words(MetadataType mdtype) const { |
coleenp@4037 | 2869 | return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() : |
coleenp@4037 | 2870 | vsm()->sum_free_in_chunks_in_use(); |
coleenp@4037 | 2871 | } |
coleenp@4037 | 2872 | |
coleenp@4037 | 2873 | // Space capacity in the Metaspace. It includes |
coleenp@4037 | 2874 | // space in the list of chunks from which allocations |
coleenp@4037 | 2875 | // have been made. Don't include space in the global freelist and |
coleenp@4037 | 2876 | // in the space available in the dictionary which |
coleenp@4037 | 2877 | // is already counted in some chunk. |
coleenp@4037 | 2878 | size_t Metaspace::capacity_words(MetadataType mdtype) const { |
coleenp@4037 | 2879 | return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() : |
coleenp@4037 | 2880 | vsm()->sum_capacity_in_chunks_in_use(); |
coleenp@4037 | 2881 | } |
coleenp@4037 | 2882 | |
coleenp@4037 | 2883 | void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
coleenp@4037 | 2884 | if (SafepointSynchronize::is_at_safepoint()) { |
coleenp@4037 | 2885 | assert(Thread::current()->is_VM_thread(), "should be the VM thread"); |
coleenp@4037 | 2886 | // Don't take lock |
coleenp@4037 | 2887 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 2888 | if (is_class) { |
coleenp@4037 | 2889 | class_vsm()->deallocate(ptr); |
coleenp@4037 | 2890 | } else { |
coleenp@4037 | 2891 | vsm()->deallocate(ptr); |
coleenp@4037 | 2892 | } |
coleenp@4037 | 2893 | #else |
coleenp@4037 | 2894 | #ifdef ASSERT |
coleenp@4037 | 2895 | Copy::fill_to_words((HeapWord*)ptr, word_size, metadata_deallocate); |
coleenp@4037 | 2896 | #endif |
coleenp@4037 | 2897 | #endif |
coleenp@4037 | 2898 | |
coleenp@4037 | 2899 | } else { |
coleenp@4037 | 2900 | MutexLocker ml(vsm()->lock()); |
coleenp@4037 | 2901 | |
coleenp@4037 | 2902 | #ifdef DEALLOCATE_BLOCKS |
coleenp@4037 | 2903 | if (is_class) { |
coleenp@4037 | 2904 | class_vsm()->deallocate(ptr); |
coleenp@4037 | 2905 | } else { |
coleenp@4037 | 2906 | vsm()->deallocate(ptr); |
coleenp@4037 | 2907 | } |
coleenp@4037 | 2908 | #else |
coleenp@4037 | 2909 | #ifdef ASSERT |
coleenp@4037 | 2910 | Copy::fill_to_words((HeapWord*)ptr, word_size, metadata_deallocate); |
coleenp@4037 | 2911 | #endif |
coleenp@4037 | 2912 | #endif |
coleenp@4037 | 2913 | } |
coleenp@4037 | 2914 | } |
coleenp@4037 | 2915 | |
coleenp@4037 | 2916 | MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
coleenp@4037 | 2917 | bool read_only, MetadataType mdtype, TRAPS) { |
coleenp@4037 | 2918 | if (HAS_PENDING_EXCEPTION) { |
coleenp@4037 | 2919 | assert(false, "Should not allocate with exception pending"); |
coleenp@4037 | 2920 | return NULL; // caller does a CHECK_NULL too |
coleenp@4037 | 2921 | } |
coleenp@4037 | 2922 | |
coleenp@4037 | 2923 | // SSS: Should we align the allocations and make sure the sizes are aligned. |
coleenp@4037 | 2924 | MetaWord* result = NULL; |
coleenp@4037 | 2925 | |
coleenp@4037 | 2926 | assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
coleenp@4037 | 2927 | "ClassLoaderData::the_null_class_loader_data() should have been used."); |
coleenp@4037 | 2928 | // Allocate in metaspaces without taking out a lock, because it deadlocks |
coleenp@4037 | 2929 | // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
coleenp@4037 | 2930 | // to revisit this for application class data sharing. |
coleenp@4037 | 2931 | if (DumpSharedSpaces) { |
coleenp@4037 | 2932 | if (read_only) { |
coleenp@4037 | 2933 | result = loader_data->ro_metaspace()->allocate(word_size, NonClassType); |
coleenp@4037 | 2934 | } else { |
coleenp@4037 | 2935 | result = loader_data->rw_metaspace()->allocate(word_size, NonClassType); |
coleenp@4037 | 2936 | } |
coleenp@4037 | 2937 | if (result == NULL) { |
coleenp@4037 | 2938 | report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
coleenp@4037 | 2939 | } |
coleenp@4037 | 2940 | return result; |
coleenp@4037 | 2941 | } |
coleenp@4037 | 2942 | |
coleenp@4037 | 2943 | result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
coleenp@4037 | 2944 | |
coleenp@4037 | 2945 | if (result == NULL) { |
coleenp@4037 | 2946 | // Try to clean out some memory and retry. |
coleenp@4037 | 2947 | result = |
coleenp@4037 | 2948 | Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
coleenp@4037 | 2949 | loader_data, word_size, mdtype); |
coleenp@4037 | 2950 | |
coleenp@4037 | 2951 | // If result is still null, we are out of memory. |
coleenp@4037 | 2952 | if (result == NULL) { |
coleenp@4037 | 2953 | // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
coleenp@4037 | 2954 | report_java_out_of_memory("Metadata space"); |
coleenp@4037 | 2955 | |
coleenp@4037 | 2956 | if (JvmtiExport::should_post_resource_exhausted()) { |
coleenp@4037 | 2957 | JvmtiExport::post_resource_exhausted( |
coleenp@4037 | 2958 | JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
coleenp@4037 | 2959 | "Metadata space"); |
coleenp@4037 | 2960 | } |
coleenp@4037 | 2961 | THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); |
coleenp@4037 | 2962 | } |
coleenp@4037 | 2963 | } |
coleenp@4037 | 2964 | return result; |
coleenp@4037 | 2965 | } |
coleenp@4037 | 2966 | |
coleenp@4037 | 2967 | void Metaspace::print_on(outputStream* out) const { |
coleenp@4037 | 2968 | // Print both class virtual space counts and metaspace. |
coleenp@4037 | 2969 | if (Verbose) { |
coleenp@4037 | 2970 | vsm()->print_on(out); |
coleenp@4037 | 2971 | class_vsm()->print_on(out); |
coleenp@4037 | 2972 | } |
coleenp@4037 | 2973 | } |
coleenp@4037 | 2974 | |
coleenp@4037 | 2975 | #ifndef PRODUCT |
coleenp@4037 | 2976 | bool Metaspace::contains(const void * ptr) const { |
coleenp@4037 | 2977 | if (MetaspaceShared::is_in_shared_space(ptr)) { |
coleenp@4037 | 2978 | return true; |
coleenp@4037 | 2979 | } |
coleenp@4037 | 2980 | MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 2981 | return space_list()->contains(ptr) || class_space_list()->contains(ptr); |
coleenp@4037 | 2982 | } |
coleenp@4037 | 2983 | #endif |
coleenp@4037 | 2984 | |
coleenp@4037 | 2985 | void Metaspace::verify() { |
coleenp@4037 | 2986 | vsm()->verify(); |
coleenp@4037 | 2987 | class_vsm()->verify(); |
coleenp@4037 | 2988 | } |
coleenp@4037 | 2989 | |
coleenp@4037 | 2990 | void Metaspace::dump(outputStream* const out) const { |
coleenp@4037 | 2991 | if (UseMallocOnly) { |
coleenp@4037 | 2992 | // Just print usage for now |
coleenp@4037 | 2993 | out->print_cr("usage %d", used_words(Metaspace::NonClassType)); |
coleenp@4037 | 2994 | } |
coleenp@4037 | 2995 | out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm()); |
coleenp@4037 | 2996 | vsm()->dump(out); |
coleenp@4037 | 2997 | out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm()); |
coleenp@4037 | 2998 | class_vsm()->dump(out); |
coleenp@4037 | 2999 | } |