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/lfu_rp.hh" 32 |
33#include <memory> |
34 35LFURP::LFURP(const Params *p) 36 : BaseReplacementPolicy(p) 37{ 38} 39 |
40void 41LFURP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 42const |
43{ |
44 // Reset reference count 45 std::static_pointer_cast<LFUReplData>(replacement_data)->refCount = 0; 46} 47 48void 49LFURP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const 50{ 51 // Update reference count 52 std::static_pointer_cast<LFUReplData>(replacement_data)->refCount++; 53} 54 55void 56LFURP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const 57{ 58 // Reset reference count 59 std::static_pointer_cast<LFUReplData>(replacement_data)->refCount = 1; 60} 61 62ReplaceableEntry* 63LFURP::getVictim(const ReplacementCandidates& candidates) const 64{ |
65 // There must be at least one replacement candidate 66 assert(candidates.size() > 0); 67 68 // Visit all candidates to find victim |
69 ReplaceableEntry* victim = candidates[0]; |
70 for (const auto& candidate : candidates) { |
71 // Update victim entry if necessary 72 if (std::static_pointer_cast<LFUReplData>( 73 candidate->replacementData)->refCount < 74 std::static_pointer_cast<LFUReplData>( 75 victim->replacementData)->refCount) { 76 victim = candidate; |
77 } 78 } 79 |
80 return victim; 81} |
82 |
83std::shared_ptr<ReplacementData> 84LFURP::instantiateEntry() 85{ 86 return std::shared_ptr<ReplacementData>(new LFUReplData()); |
87} 88 89LFURP* 90LFURPParams::create() 91{ 92 return new LFURP(this); 93} |