random_rp.cc revision 12727
112600Sodanrc@yahoo.com.br/** 212600Sodanrc@yahoo.com.br * Copyright (c) 2018 Inria 312600Sodanrc@yahoo.com.br * All rights reserved. 412600Sodanrc@yahoo.com.br * 512600Sodanrc@yahoo.com.br * Redistribution and use in source and binary forms, with or without 612600Sodanrc@yahoo.com.br * modification, are permitted provided that the following conditions are 712600Sodanrc@yahoo.com.br * met: redistributions of source code must retain the above copyright 812600Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer; 912600Sodanrc@yahoo.com.br * redistributions in binary form must reproduce the above copyright 1012600Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer in the 1112600Sodanrc@yahoo.com.br * documentation and/or other materials provided with the distribution; 1212600Sodanrc@yahoo.com.br * neither the name of the copyright holders nor the names of its 1312600Sodanrc@yahoo.com.br * contributors may be used to endorse or promote products derived from 1412600Sodanrc@yahoo.com.br * this software without specific prior written permission. 1512600Sodanrc@yahoo.com.br * 1612600Sodanrc@yahoo.com.br * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1712600Sodanrc@yahoo.com.br * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1812600Sodanrc@yahoo.com.br * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1912600Sodanrc@yahoo.com.br * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2012600Sodanrc@yahoo.com.br * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2112600Sodanrc@yahoo.com.br * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2212600Sodanrc@yahoo.com.br * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2312600Sodanrc@yahoo.com.br * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2412600Sodanrc@yahoo.com.br * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2512600Sodanrc@yahoo.com.br * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2612600Sodanrc@yahoo.com.br * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2712600Sodanrc@yahoo.com.br * 2812600Sodanrc@yahoo.com.br * Authors: Daniel Carvalho 2912600Sodanrc@yahoo.com.br */ 3012600Sodanrc@yahoo.com.br 3112600Sodanrc@yahoo.com.br#include "mem/cache/replacement_policies/random_rp.hh" 3212600Sodanrc@yahoo.com.br 3312727Snikos.nikoleris@arm.com#include <cassert> 3412727Snikos.nikoleris@arm.com#include <memory> 3512727Snikos.nikoleris@arm.com 3612600Sodanrc@yahoo.com.br#include "base/random.hh" 3712727Snikos.nikoleris@arm.com#include "params/RandomRP.hh" 3812600Sodanrc@yahoo.com.br 3912600Sodanrc@yahoo.com.brRandomRP::RandomRP(const Params *p) 4012600Sodanrc@yahoo.com.br : BaseReplacementPolicy(p) 4112600Sodanrc@yahoo.com.br{ 4212600Sodanrc@yahoo.com.br} 4312600Sodanrc@yahoo.com.br 4412684Sodanrc@yahoo.com.brvoid 4512684Sodanrc@yahoo.com.brRandomRP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 4612684Sodanrc@yahoo.com.brconst 4712684Sodanrc@yahoo.com.br{ 4812684Sodanrc@yahoo.com.br // Unprioritize replacement data victimization 4912684Sodanrc@yahoo.com.br std::static_pointer_cast<RandomReplData>( 5012684Sodanrc@yahoo.com.br replacement_data)->valid = false; 5112684Sodanrc@yahoo.com.br} 5212684Sodanrc@yahoo.com.br 5312684Sodanrc@yahoo.com.brvoid 5412684Sodanrc@yahoo.com.brRandomRP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const 5512684Sodanrc@yahoo.com.br{ 5612684Sodanrc@yahoo.com.br} 5712684Sodanrc@yahoo.com.br 5812684Sodanrc@yahoo.com.brvoid 5912684Sodanrc@yahoo.com.brRandomRP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const 6012684Sodanrc@yahoo.com.br{ 6112684Sodanrc@yahoo.com.br // Unprioritize replacement data victimization 6212684Sodanrc@yahoo.com.br std::static_pointer_cast<RandomReplData>( 6312684Sodanrc@yahoo.com.br replacement_data)->valid = true; 6412684Sodanrc@yahoo.com.br} 6512684Sodanrc@yahoo.com.br 6612684Sodanrc@yahoo.com.brReplaceableEntry* 6712684Sodanrc@yahoo.com.brRandomRP::getVictim(const ReplacementCandidates& candidates) const 6812600Sodanrc@yahoo.com.br{ 6912600Sodanrc@yahoo.com.br // There must be at least one replacement candidate 7012600Sodanrc@yahoo.com.br assert(candidates.size() > 0); 7112600Sodanrc@yahoo.com.br 7212600Sodanrc@yahoo.com.br // Choose one candidate at random 7312684Sodanrc@yahoo.com.br ReplaceableEntry* victim = candidates[random_mt.random<unsigned>(0, 7412600Sodanrc@yahoo.com.br candidates.size() - 1)]; 7512600Sodanrc@yahoo.com.br 7612684Sodanrc@yahoo.com.br // Visit all candidates to search for an invalid entry. If one is found, 7712684Sodanrc@yahoo.com.br // its eviction is prioritized 7812600Sodanrc@yahoo.com.br for (const auto& candidate : candidates) { 7912684Sodanrc@yahoo.com.br if (!std::static_pointer_cast<RandomReplData>( 8012684Sodanrc@yahoo.com.br candidate->replacementData)->valid) { 8112684Sodanrc@yahoo.com.br victim = candidate; 8212600Sodanrc@yahoo.com.br break; 8312600Sodanrc@yahoo.com.br } 8412600Sodanrc@yahoo.com.br } 8512600Sodanrc@yahoo.com.br 8612684Sodanrc@yahoo.com.br return victim; 8712684Sodanrc@yahoo.com.br} 8812600Sodanrc@yahoo.com.br 8912684Sodanrc@yahoo.com.brstd::shared_ptr<ReplacementData> 9012684Sodanrc@yahoo.com.brRandomRP::instantiateEntry() 9112684Sodanrc@yahoo.com.br{ 9212718Sodanrc@yahoo.com.br return std::shared_ptr<ReplacementData>(new RandomReplData()); 9312600Sodanrc@yahoo.com.br} 9412600Sodanrc@yahoo.com.br 9512600Sodanrc@yahoo.com.brRandomRP* 9612600Sodanrc@yahoo.com.brRandomRPParams::create() 9712600Sodanrc@yahoo.com.br{ 9812600Sodanrc@yahoo.com.br return new RandomRP(this); 9912600Sodanrc@yahoo.com.br} 100