1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/freeBlockDictionary.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,106 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
1.29 +#define SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +#include "runtime/mutex.hpp"
1.33 +#include "utilities/debug.hpp"
1.34 +#include "utilities/globalDefinitions.hpp"
1.35 +#include "utilities/ostream.hpp"
1.36 +
1.37 +// A FreeBlockDictionary is an abstract superclass that will allow
1.38 +// a number of alternative implementations in the future.
1.39 +template <class Chunk>
1.40 +class FreeBlockDictionary: public CHeapObj<mtGC> {
1.41 + public:
1.42 + enum Dither {
1.43 + atLeast,
1.44 + exactly,
1.45 + roughly
1.46 + };
1.47 + enum DictionaryChoice {
1.48 + dictionaryBinaryTree = 0,
1.49 + dictionarySplayTree = 1,
1.50 + dictionarySkipList = 2
1.51 + };
1.52 +
1.53 + private:
1.54 + // This field is added and can be set to point to the
1.55 + // the Mutex used to synchronize access to the
1.56 + // dictionary so that assertion checking can be done.
1.57 + // For example it is set to point to _parDictionaryAllocLock.
1.58 + NOT_PRODUCT(Mutex* _lock;)
1.59 +
1.60 + public:
1.61 + virtual void remove_chunk(Chunk* fc) = 0;
1.62 + virtual Chunk* get_chunk(size_t size, Dither dither = atLeast) = 0;
1.63 + virtual void return_chunk(Chunk* chunk) = 0;
1.64 + virtual size_t total_chunk_size(debug_only(const Mutex* lock)) const = 0;
1.65 + virtual size_t max_chunk_size() const = 0;
1.66 + virtual size_t min_size() const = 0;
1.67 + // Reset the dictionary to the initial conditions for a single
1.68 + // block.
1.69 + virtual void reset(HeapWord* addr, size_t size) = 0;
1.70 + virtual void reset() = 0;
1.71 +
1.72 + virtual void dict_census_update(size_t size, bool split, bool birth) = 0;
1.73 + virtual bool coal_dict_over_populated(size_t size) = 0;
1.74 + virtual void begin_sweep_dict_census(double coalSurplusPercent,
1.75 + float inter_sweep_current, float inter_sweep_estimate,
1.76 + float intra__sweep_current) = 0;
1.77 + virtual void end_sweep_dict_census(double splitSurplusPercent) = 0;
1.78 + virtual Chunk* find_largest_dict() const = 0;
1.79 + // verify that the given chunk is in the dictionary.
1.80 + virtual bool verify_chunk_in_free_list(Chunk* tc) const = 0;
1.81 +
1.82 + // Sigma_{all_free_blocks} (block_size^2)
1.83 + virtual double sum_of_squared_block_sizes() const = 0;
1.84 +
1.85 + virtual Chunk* find_chunk_ends_at(HeapWord* target) const = 0;
1.86 + virtual void inc_total_size(size_t v) = 0;
1.87 + virtual void dec_total_size(size_t v) = 0;
1.88 +
1.89 + NOT_PRODUCT (
1.90 + virtual size_t sum_dict_returned_bytes() = 0;
1.91 + virtual void initialize_dict_returned_bytes() = 0;
1.92 + virtual size_t total_count() = 0;
1.93 + )
1.94 +
1.95 + virtual void report_statistics() const {
1.96 + gclog_or_tty->print("No statistics available");
1.97 + }
1.98 +
1.99 + virtual void print_dict_census() const = 0;
1.100 + virtual void print_free_lists(outputStream* st) const = 0;
1.101 +
1.102 + virtual void verify() const = 0;
1.103 +
1.104 + Mutex* par_lock() const PRODUCT_RETURN0;
1.105 + void set_par_lock(Mutex* lock) PRODUCT_RETURN;
1.106 + void verify_par_locked() const PRODUCT_RETURN;
1.107 +};
1.108 +
1.109 +#endif // SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
