fifo_rp.hh (12607:b1cc6815194e) fifo_rp.hh (12684:44ebd2bc020f)
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;

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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
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 /**
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__