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; --- 29 unchanged lines hidden (view full) --- 38#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_LRU_RP_HH__ 39#define __MEM_CACHE_REPLACEMENT_POLICIES_LRU_RP_HH__ 40 41#include "mem/cache/replacement_policies/base.hh" 42#include "params/LRURP.hh" 43 44class LRURP : public BaseReplacementPolicy 45{ |
46 protected: 47 /** LRU-specific implementation of replacement data. */ 48 struct LRUReplData : ReplacementData 49 { 50 /** Tick on which the entry was last touched. */ 51 Tick lastTouchTick; 52 53 /** 54 * Default constructor. Invalidate data. 55 */ 56 LRUReplData() : lastTouchTick(0) {} 57 }; 58 |
59 public: 60 /** Convenience typedef. */ 61 typedef LRURPParams Params; 62 63 /** 64 * Construct and initiliaze this replacement policy. 65 */ 66 LRURP(const Params *p); 67 68 /** 69 * Destructor. 70 */ 71 ~LRURP() {} 72 73 /** |
74 * Invalidate replacement data to set it as the next probable victim. 75 * Sets its last touch tick as the starting tick. |
76 * |
77 * @param replacement_data Replacement data to be invalidated. |
78 */ |
79 void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 80 const override; |
81 82 /** |
83 * Touch an entry to update its replacement data. |
84 * Sets its last touch tick as the current tick. 85 * |
86 * @param replacement_data Replacement data to be touched. |
87 */ |
88 void touch(const std::shared_ptr<ReplacementData>& replacement_data) const 89 override; |
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 /** |
101 * Find replacement victim using LRU timestamps. 102 * 103 * @param candidates Replacement candidates, selected by indexing policy. |
104 * @return Replacement entry to be replaced. |
105 */ |
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; |
115}; 116 117#endif // __MEM_CACHE_REPLACEMENT_POLICIES_LRU_RP_HH__ |