lru_rp.cc (12600:e670dd17c8cf) lru_rp.cc (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;

--- 16 unchanged lines hidden (view full) ---

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
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;

--- 16 unchanged lines hidden (view full) ---

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