lfu_rp.hh (12628:458d655f2abb) | lfu_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; --- 18 unchanged lines hidden (view full) --- 27 * 28 * Authors: Daniel Carvalho 29 */ 30 31/** 32 * @file 33 * Declaration of a Least Frequently Used replacement policy. 34 * The victim is chosen using the reference frequency. The least referenced | 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; --- 18 unchanged lines hidden (view full) --- 27 * 28 * Authors: Daniel Carvalho 29 */ 30 31/** 32 * @file 33 * Declaration of a Least Frequently Used replacement policy. 34 * The victim is chosen using the reference frequency. The least referenced |
35 * block is always chosen to be evicted, regardless of the amount of times | 35 * entry is always chosen to be evicted, regardless of the amount of times |
36 * it has been touched, or how long has passed since its last touch. 37 */ 38 39#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_LFU_RP_HH__ 40#define __MEM_CACHE_REPLACEMENT_POLICIES_LFU_RP_HH__ 41 42#include "mem/cache/replacement_policies/base.hh" 43#include "params/LFURP.hh" 44 45class LFURP : public BaseReplacementPolicy 46{ | 36 * it has been touched, or how long has passed since its last touch. 37 */ 38 39#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_LFU_RP_HH__ 40#define __MEM_CACHE_REPLACEMENT_POLICIES_LFU_RP_HH__ 41 42#include "mem/cache/replacement_policies/base.hh" 43#include "params/LFURP.hh" 44 45class LFURP : public BaseReplacementPolicy 46{ |
47 protected: 48 /** LFU-specific implementation of replacement data. */ 49 struct LFUReplData : ReplacementData 50 { 51 /** Number of references to this entry since it was reset. */ 52 unsigned refCount; 53 54 /** 55 * Default constructor. Invalidate data. 56 */ 57 LFUReplData() : refCount(0) {} 58 }; 59 |
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47 public: 48 /** Convenience typedef. */ 49 typedef LFURPParams Params; 50 51 /** 52 * Construct and initiliaze this replacement policy. 53 */ 54 LFURP(const Params *p); 55 56 /** 57 * Destructor. 58 */ 59 ~LFURP() {} 60 61 /** | 60 public: 61 /** Convenience typedef. */ 62 typedef LFURPParams Params; 63 64 /** 65 * Construct and initiliaze this replacement policy. 66 */ 67 LFURP(const Params *p); 68 69 /** 70 * Destructor. 71 */ 72 ~LFURP() {} 73 74 /** |
75 * Invalidate replacement data to set it as the next probable victim. 76 * Clear the number of references. 77 * 78 * @param replacement_data Replacement data to be invalidated. 79 */ 80 void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 81 const override; 82 83 /** 84 * Touch an entry to update its replacement data. 85 * Increase number of references. 86 * 87 * @param replacement_data Replacement data to be touched. 88 */ 89 void touch(const std::shared_ptr<ReplacementData>& replacement_data) const 90 override; 91 92 /** 93 * Reset replacement data. Used when an entry is inserted. 94 * Reset number of references. 95 * 96 * @param replacement_data Replacement data to be reset. 97 */ 98 void reset(const std::shared_ptr<ReplacementData>& replacement_data) const 99 override; 100 101 /** |
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62 * Find replacement victim using reference frequency. 63 * 64 * @param cands Replacement candidates, selected by indexing policy. | 102 * Find replacement victim using reference frequency. 103 * 104 * @param cands Replacement candidates, selected by indexing policy. |
65 * @return Cache block to be replaced. | 105 * @return Replacement entry to be replaced. |
66 */ | 106 */ |
67 CacheBlk* getVictim(const ReplacementCandidates& candidates) override; | 107 ReplaceableEntry* getVictim(const ReplacementCandidates& candidates) const 108 override; 109 110 /** 111 * Instantiate a replacement data entry. 112 * 113 * @return A shared pointer to the new replacement data. 114 */ 115 std::shared_ptr<ReplacementData> instantiateEntry() override; |
68}; 69 70#endif // __MEM_CACHE_REPLACEMENT_POLICIES_LFU_RP_HH__ | 116}; 117 118#endif // __MEM_CACHE_REPLACEMENT_POLICIES_LFU_RP_HH__ |