fifo_rp.hh (12607:b1cc6815194e) | fifo_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 First In First Out 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 First In First Out replacement policy. |
34 * The victim is chosen using the timestamp. The oldest block is always chosen | 34 * The victim is chosen using the timestamp. The oldest entry is always chosen |
35 * to be evicted, regardless of the amount of times it has been touched. 36 */ 37 38#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__ 39#define __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__ 40 41#include "mem/cache/replacement_policies/base.hh" 42#include "params/FIFORP.hh" 43 44class FIFORP : public BaseReplacementPolicy 45{ | 35 * to be evicted, regardless of the amount of times it has been touched. 36 */ 37 38#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__ 39#define __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__ 40 41#include "mem/cache/replacement_policies/base.hh" 42#include "params/FIFORP.hh" 43 44class FIFORP : public BaseReplacementPolicy 45{ |
46 /** FIFO-specific implementation of replacement data. */ 47 struct FIFOReplData : ReplacementData 48 { 49 /** Tick on which the entry was inserted. */ 50 Tick tickInserted; 51 52 /** 53 * Default constructor. Invalidate data. 54 */ 55 FIFOReplData() : tickInserted(0) {} 56 }; 57 |
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46 public: 47 /** Convenience typedef. */ 48 typedef FIFORPParams Params; 49 50 /** 51 * Construct and initiliaze this replacement policy. 52 */ 53 FIFORP(const Params *p); 54 55 /** 56 * Destructor. 57 */ 58 ~FIFORP() {} 59 60 /** | 58 public: 59 /** Convenience typedef. */ 60 typedef FIFORPParams Params; 61 62 /** 63 * Construct and initiliaze this replacement policy. 64 */ 65 FIFORP(const Params *p); 66 67 /** 68 * Destructor. 69 */ 70 ~FIFORP() {} 71 72 /** |
73 * Invalidate replacement data to set it as the next probable victim. 74 * Reset insertion tick to 0. 75 * 76 * @param replacement_data Replacement data to be invalidated. 77 */ 78 void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 79 const override; 80 81 /** 82 * Touch an entry to update its replacement data. 83 * Does not modify the replacement data. 84 * 85 * @param replacement_data Replacement data to be touched. 86 */ 87 void touch(const std::shared_ptr<ReplacementData>& replacement_data) const 88 override; 89 90 /** 91 * Reset replacement data. Used when an entry is inserted. 92 * Sets its insertion tick. 93 * 94 * @param replacement_data Replacement data to be reset. 95 */ 96 void reset(const std::shared_ptr<ReplacementData>& replacement_data) const 97 override; 98 99 /** |
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61 * Find replacement victim using insertion timestamps. 62 * 63 * @param cands Replacement candidates, selected by indexing policy. | 100 * Find replacement victim using insertion timestamps. 101 * 102 * @param cands Replacement candidates, selected by indexing policy. |
64 * @return Cache block to be replaced. | 103 * @return Replacement entry to be replaced. |
65 */ | 104 */ |
66 CacheBlk* getVictim(const ReplacementCandidates& cands) override; | 105 ReplaceableEntry* getVictim(const ReplacementCandidates& candidates) const 106 override; 107 108 /** 109 * Instantiate a replacement data entry. 110 * 111 * @return A shared pointer to the new replacement data. 112 */ 113 std::shared_ptr<ReplacementData> instantiateEntry() override; |
67}; 68 69#endif // __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__ | 114}; 115 116#endif // __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__ |