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; --- 17 unchanged lines hidden (view full) --- 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/random_rp.hh" 32 33#include "base/random.hh" |
34#include "mem/cache/blk.hh" |
35 36RandomRP::RandomRP(const Params *p) 37 : BaseReplacementPolicy(p) 38{ 39} 40 |
41void 42RandomRP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 43const |
44{ |
45 // Unprioritize replacement data victimization 46 std::static_pointer_cast<RandomReplData>( 47 replacement_data)->valid = false; 48} 49 50void 51RandomRP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const 52{ 53} 54 55void 56RandomRP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const 57{ 58 // Unprioritize replacement data victimization 59 std::static_pointer_cast<RandomReplData>( 60 replacement_data)->valid = true; 61} 62 63ReplaceableEntry* 64RandomRP::getVictim(const ReplacementCandidates& candidates) const 65{ |
66 // There must be at least one replacement candidate 67 assert(candidates.size() > 0); 68 69 // Choose one candidate at random |
70 ReplaceableEntry* victim = candidates[random_mt.random<unsigned>(0, |
71 candidates.size() - 1)]; 72 |
73 // Visit all candidates to search for an invalid entry. If one is found, 74 // its eviction is prioritized |
75 for (const auto& candidate : candidates) { |
76 if (!std::static_pointer_cast<RandomReplData>( 77 candidate->replacementData)->valid) { 78 victim = candidate; |
79 break; 80 } 81 } 82 |
83 return victim; 84} |
85 |
86std::shared_ptr<ReplacementData> 87RandomRP::instantiateEntry() 88{ 89 return std::shared_ptr<ReplacementData>(new ReplacementData()); |
90} 91 92RandomRP* 93RandomRPParams::create() 94{ 95 return new RandomRP(this); 96} |