bip_rp.cc revision 12684
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/bip_rp.hh" 32 33#include <memory> 34 35#include "base/random.hh" 36 37BIPRP::BIPRP(const Params *p) 38 : LRURP(p), btp(p->btp) 39{ 40} 41 42void 43BIPRP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const 44{ 45 std::shared_ptr<LRUReplData> casted_replacement_data = 46 std::static_pointer_cast<LRUReplData>(replacement_data); 47 48 // Entries are inserted as MRU if lower than btp, LRU otherwise 49 if (random_mt.random<unsigned>(1, 100) <= btp) { 50 casted_replacement_data->lastTouchTick = curTick(); 51 } else { 52 // Make their timestamps as old as possible, so that they become LRU 53 casted_replacement_data->lastTouchTick = 1; 54 } 55} 56 57BIPRP* 58BIPRPParams::create() 59{ 60 return new BIPRP(this); 61} 62