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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 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{
| 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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 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{
|
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
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 /**
100 * Find replacement victim using insertion timestamps.
101 *
102 * @param cands Replacement candidates, selected by indexing policy.
103 * @return Replacement entry to be replaced.
104 */
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;
114};
115
116#endif // __MEM_CACHE_REPLACEMENT_POLICIES_FIFO_RP_HH__
| 47 /** FIFO-specific implementation of replacement data. */
48 struct FIFOReplData : ReplacementData
49 {
50 /** Tick on which the entry was inserted. */
51 Tick tickInserted;
52
53 /**
54 * Default constructor. Invalidate data.
55 */
56 FIFOReplData() : tickInserted(0) {}
57 };
58
59 public:
60 /** Convenience typedef. */
61 typedef FIFORPParams Params;
62
63 /**
64 * Construct and initiliaze this replacement policy.
65 */
66 FIFORP(const Params *p);
67
68 /**
69 * Destructor.
70 */
71 ~FIFORP() {}
72
73 /**
74 * Invalidate replacement data to set it as the next probable victim.
75 * Reset insertion tick to 0.
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 * Does not modify the replacement data.
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 insertion 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 insertion timestamps.
102 *
103 * @param cands 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_FIFO_RP_HH__
|