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1 /*
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196
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2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A FreeBlockDictionary is an abstract superclass that will allow
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26 // a number of alternative implementations in the future.
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27 class FreeBlockDictionary: public CHeapObj {
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28 public:
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29 enum Dither {
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30 atLeast,
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31 exactly,
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32 roughly
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33 };
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34 enum DictionaryChoice {
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35 dictionaryBinaryTree = 0,
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36 dictionarySplayTree = 1,
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37 dictionarySkipList = 2
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38 };
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39
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40 private:
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41 NOT_PRODUCT(Mutex* _lock;)
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42
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43 public:
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44 virtual void removeChunk(FreeChunk* fc) = 0;
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45 virtual FreeChunk* getChunk(size_t size, Dither dither = atLeast) = 0;
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46 virtual void returnChunk(FreeChunk* chunk) = 0;
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47 virtual size_t totalChunkSize(debug_only(const Mutex* lock)) const = 0;
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48 virtual size_t maxChunkSize() const = 0;
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49 virtual size_t minSize() const = 0;
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50 // Reset the dictionary to the initial conditions for a single
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51 // block.
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52 virtual void reset(HeapWord* addr, size_t size) = 0;
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53 virtual void reset() = 0;
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54
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55 virtual void dictCensusUpdate(size_t size, bool split, bool birth) = 0;
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56 virtual bool coalDictOverPopulated(size_t size) = 0;
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57 virtual void beginSweepDictCensus(double coalSurplusPercent,
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58 float sweep_current, float sweep_ewstimate) = 0;
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59 virtual void endSweepDictCensus(double splitSurplusPercent) = 0;
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60 virtual FreeChunk* findLargestDict() const = 0;
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61 // verify that the given chunk is in the dictionary.
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62 virtual bool verifyChunkInFreeLists(FreeChunk* tc) const = 0;
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63
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64 // Sigma_{all_free_blocks} (block_size^2)
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65 virtual double sum_of_squared_block_sizes() const = 0;
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66
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67 virtual FreeChunk* find_chunk_ends_at(HeapWord* target) const = 0;
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68 virtual void inc_totalSize(size_t v) = 0;
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69 virtual void dec_totalSize(size_t v) = 0;
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70
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71 NOT_PRODUCT (
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72 virtual size_t sumDictReturnedBytes() = 0;
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73 virtual void initializeDictReturnedBytes() = 0;
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74 virtual size_t totalCount() = 0;
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75 )
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76
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77 virtual void reportStatistics() const {
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78 gclog_or_tty->print("No statistics available");
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79 }
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80
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81 virtual void printDictCensus() const = 0;
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82
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83 virtual void verify() const = 0;
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84
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85 Mutex* par_lock() const PRODUCT_RETURN0;
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86 void set_par_lock(Mutex* lock) PRODUCT_RETURN;
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87 void verify_par_locked() const PRODUCT_RETURN;
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88 };
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