mru_rp.hh (12613:40c18bb90501) | mru_rp.hh (12684:44ebd2bc020f) |
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1/** 2 * Copyright (c) 2018 Inria 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; --- 17 unchanged lines hidden (view full) --- 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Daniel Carvalho 29 */ 30 31/** 32 * @file 33 * Declaration of a Most Recently Used replacement policy. | 1/** 2 * Copyright (c) 2018 Inria 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; --- 17 unchanged lines hidden (view full) --- 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Daniel Carvalho 29 */ 30 31/** 32 * @file 33 * Declaration of a Most Recently Used replacement policy. |
34 * The victim is chosen using the timestamp. The block that was accessed the | 34 * The victim is chosen using the timestamp. The entry that was accessed the |
35 * last is the one chosen to be replaced. 36 */ 37 38#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 39#define __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 40 41#include "mem/cache/replacement_policies/base.hh" 42#include "params/MRURP.hh" 43 44class MRURP : public BaseReplacementPolicy 45{ | 35 * last is the one chosen to be replaced. 36 */ 37 38#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 39#define __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 40 41#include "mem/cache/replacement_policies/base.hh" 42#include "params/MRURP.hh" 43 44class MRURP : public BaseReplacementPolicy 45{ |
46 protected: 47 /** MRU-specific implementation of replacement data. */ 48 struct MRUReplData : ReplacementData 49 { 50 /** Tick on which the entry was last touched. */ 51 Tick lastTouchTick; 52 53 /** 54 * Default constructor. Invalidate data. 55 */ 56 MRUReplData() : lastTouchTick(0) {} 57 }; 58 |
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46 public: 47 /** Convenience typedef. */ 48 typedef MRURPParams Params; 49 50 /** 51 * Construct and initiliaze this replacement policy. 52 */ 53 MRURP(const Params *p); 54 55 /** 56 * Destructor. 57 */ 58 ~MRURP() {} 59 60 /** | 59 public: 60 /** Convenience typedef. */ 61 typedef MRURPParams Params; 62 63 /** 64 * Construct and initiliaze this replacement policy. 65 */ 66 MRURP(const Params *p); 67 68 /** 69 * Destructor. 70 */ 71 ~MRURP() {} 72 73 /** |
61 * Touch a block to update its last touch tick. | 74 * Invalidate replacement data to set it as the next probable victim. 75 * Sets its last touch tick as the starting tick. |
62 * | 76 * |
63 * @param blk Cache block to be touched. | 77 * @param replacement_data Replacement data to be invalidated. |
64 */ | 78 */ |
65 void touch(CacheBlk *blk) override; | 79 void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 80 const override; |
66 67 /** | 81 82 /** |
68 * Reset replacement data for a block. Used when a block is inserted. | 83 * Touch an entry to update its replacement data. |
69 * Sets its last touch tick as the current tick. 70 * | 84 * Sets its last touch tick as the current tick. 85 * |
71 * @param blk Cache block to be reset. | 86 * @param replacement_data Replacement data to be touched. |
72 */ | 87 */ |
73 void reset(CacheBlk *blk) override; | 88 void touch(const std::shared_ptr<ReplacementData>& replacement_data) const 89 override; |
74 75 /** | 90 91 /** |
92 * Reset replacement data. Used when an entry is inserted. 93 * Sets its last touch tick as the current tick. 94 * 95 * @param replacement_data Replacement data to be reset. 96 */ 97 void reset(const std::shared_ptr<ReplacementData>& replacement_data) const 98 override; 99 100 /** |
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76 * Find replacement victim using access timestamps. | 101 * Find replacement victim using access timestamps. |
102 * |
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77 * @param cands Replacement candidates, selected by indexing policy. | 103 * @param cands Replacement candidates, selected by indexing policy. |
78 * @return Cache block to be replaced. | 104 * @return Replacement entry to be replaced. |
79 */ | 105 */ |
80 CacheBlk* getVictim(const ReplacementCandidates& candidates) override; | 106 ReplaceableEntry* getVictim(const ReplacementCandidates& candidates) const 107 override; 108 109 /** 110 * Instantiate a replacement data entry. 111 * 112 * @return A shared pointer to the new replacement data. 113 */ 114 std::shared_ptr<ReplacementData> instantiateEntry() override; |
81}; 82 83#endif // __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ | 115}; 116 117#endif // __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ |