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#include "mem/cache/replacement_policies/mru_rp.hh" 32
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33#include "debug/CacheRepl.hh"
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33#include <memory> |
34 35MRURP::MRURP(const Params *p) 36 : BaseReplacementPolicy(p) 37{ 38} 39 40void
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41MRURP::touch(CacheBlk *blk)
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41MRURP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 42const |
43{
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43 BaseReplacementPolicy::touch(blk);
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44 // Reset last touch timestamp 45 std::static_pointer_cast<MRUReplData>( 46 replacement_data)->lastTouchTick = Tick(0); 47} |
48
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49void 50MRURP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const 51{ |
52 // Update last touch timestamp
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46 blk->lastTouchTick = curTick();
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53 std::static_pointer_cast<MRUReplData>( 54 replacement_data)->lastTouchTick = curTick(); |
55} 56 57void
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50MRURP::reset(CacheBlk *blk)
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58MRURP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const |
59{
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52 BaseReplacementPolicy::reset(blk);
53
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60 // Set last touch timestamp
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55 blk->lastTouchTick = blk->tickInserted;
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61 std::static_pointer_cast<MRUReplData>( 62 replacement_data)->lastTouchTick = curTick(); |
63} 64
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58CacheBlk*
59MRURP::getVictim(const ReplacementCandidates& candidates)
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65ReplaceableEntry* 66MRURP::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
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65 CacheBlk* blk = candidates[0];
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72 ReplaceableEntry* victim = candidates[0]; |
73 for (const auto& candidate : candidates) {
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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;
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74 // Update victim entry if necessary 75 if (std::static_pointer_cast<MRUReplData>( 76 candidate->replacementData)->lastTouchTick > 77 std::static_pointer_cast<MRUReplData>( 78 victim->replacementData)->lastTouchTick) { 79 victim = candidate; |
80 } 81 } 82
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77 DPRINTF(CacheRepl, "set %x, way %x: selecting blk for replacement\n",
78 blk->set, blk->way);
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83 return victim; 84} |
85
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80 return blk;
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86std::shared_ptr<ReplacementData> 87MRURP::instantiateEntry() 88{ 89 return std::shared_ptr<ReplacementData>(new MRUReplData()); |
90} 91 92MRURP* 93MRURPParams::create() 94{ 95 return new MRURP(this); 96}
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