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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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#include "mem/cache/replacement_policies/lru_rp.hh"
32
33#include <memory>
34
35LRURP::LRURP(const Params *p)
36 : BaseReplacementPolicy(p)
37{
38}
39
40void
41LRURP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data)
42const
43{
44 // Reset last touch timestamp
45 std::static_pointer_cast<LRUReplData>(
46 replacement_data)->lastTouchTick = Tick(0);
47}
48
49void
50LRURP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const
51{
52 // Update last touch timestamp
53 std::static_pointer_cast<LRUReplData>(
54 replacement_data)->lastTouchTick = curTick();
55}
56
57void
58LRURP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const
59{
60 // Set last touch timestamp
61 std::static_pointer_cast<LRUReplData>(
62 replacement_data)->lastTouchTick = curTick();
63}
64
65ReplaceableEntry*
66LRURP::getVictim(const ReplacementCandidates& candidates) const
67{
68 // There must be at least one replacement candidate
69 assert(candidates.size() > 0);
70
71 // Visit all candidates to find victim
72 ReplaceableEntry* victim = candidates[0];
73 for (const auto& candidate : candidates) {
74 // Update victim entry if necessary
75 if (std::static_pointer_cast<LRUReplData>(
76 candidate->replacementData)->lastTouchTick <
77 std::static_pointer_cast<LRUReplData>(
78 victim->replacementData)->lastTouchTick) {
79 victim = candidate;
80 }
81 }
82
83 return victim;
84}
85
86std::shared_ptr<ReplacementData>
87LRURP::instantiateEntry()
88{
89 return std::shared_ptr<ReplacementData>(new LRUReplData());
90}
91
92LRURP*
93LRURPParams::create()
94{
95 return new LRURP(this);
96}