| /* |
| * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP |
| #define SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "runtime/mutex.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "utilities/ostream.hpp" |
| |
| // A FreeBlockDictionary is an abstract superclass that will allow |
| // a number of alternative implementations in the future. |
| template <class Chunk> |
| class FreeBlockDictionary: public CHeapObj<mtGC> { |
| public: |
| enum Dither { |
| atLeast, |
| exactly, |
| roughly |
| }; |
| enum DictionaryChoice { |
| dictionaryBinaryTree = 0, |
| dictionarySplayTree = 1, |
| dictionarySkipList = 2 |
| }; |
| |
| private: |
| // This field is added and can be set to point to the |
| // the Mutex used to synchronize access to the |
| // dictionary so that assertion checking can be done. |
| // For example it is set to point to _parDictionaryAllocLock. |
| NOT_PRODUCT(Mutex* _lock;) |
| |
| public: |
| virtual void remove_chunk(Chunk* fc) = 0; |
| virtual Chunk* get_chunk(size_t size, Dither dither = atLeast) = 0; |
| virtual void return_chunk(Chunk* chunk) = 0; |
| virtual size_t total_chunk_size(debug_only(const Mutex* lock)) const = 0; |
| virtual size_t max_chunk_size() const = 0; |
| virtual size_t min_size() const = 0; |
| // Reset the dictionary to the initial conditions for a single |
| // block. |
| virtual void reset(HeapWord* addr, size_t size) = 0; |
| virtual void reset() = 0; |
| |
| virtual void dict_census_update(size_t size, bool split, bool birth) = 0; |
| virtual bool coal_dict_over_populated(size_t size) = 0; |
| virtual void begin_sweep_dict_census(double coalSurplusPercent, |
| float inter_sweep_current, float inter_sweep_estimate, |
| float intra__sweep_current) = 0; |
| virtual void end_sweep_dict_census(double splitSurplusPercent) = 0; |
| virtual Chunk* find_largest_dict() const = 0; |
| // verify that the given chunk is in the dictionary. |
| virtual bool verify_chunk_in_free_list(Chunk* tc) const = 0; |
| |
| // Sigma_{all_free_blocks} (block_size^2) |
| virtual double sum_of_squared_block_sizes() const = 0; |
| |
| virtual Chunk* find_chunk_ends_at(HeapWord* target) const = 0; |
| virtual void inc_total_size(size_t v) = 0; |
| virtual void dec_total_size(size_t v) = 0; |
| |
| NOT_PRODUCT ( |
| virtual size_t sum_dict_returned_bytes() = 0; |
| virtual void initialize_dict_returned_bytes() = 0; |
| virtual size_t total_count() = 0; |
| ) |
| |
| virtual void report_statistics() const { |
| gclog_or_tty->print("No statistics available"); |
| } |
| |
| virtual void print_dict_census() const = 0; |
| virtual void print_free_lists(outputStream* st) const = 0; |
| |
| virtual void verify() const = 0; |
| |
| Mutex* par_lock() const PRODUCT_RETURN0; |
| void set_par_lock(Mutex* lock) PRODUCT_RETURN; |
| void verify_par_locked() const PRODUCT_RETURN; |
| }; |
| |
| #endif // SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP |