| /** |
| * Copyright (c) 2018-2020 Inria |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution; |
| * neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "mem/cache/replacement_policies/bip_rp.hh" |
| |
| #include <memory> |
| |
| #include "base/random.hh" |
| #include "params/BIPRP.hh" |
| #include "sim/core.hh" |
| |
| namespace gem5 |
| { |
| |
| GEM5_DEPRECATED_NAMESPACE(ReplacementPolicy, replacement_policy); |
| namespace replacement_policy |
| { |
| |
| BIP::BIP(const Params &p) |
| : LRU(p), btp(p.btp) |
| { |
| } |
| |
| void |
| BIP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const |
| { |
| std::shared_ptr<LRUReplData> casted_replacement_data = |
| std::static_pointer_cast<LRUReplData>(replacement_data); |
| |
| // Entries are inserted as MRU if lower than btp, LRU otherwise |
| if (random_mt.random<unsigned>(1, 100) <= btp) { |
| casted_replacement_data->lastTouchTick = curTick(); |
| } else { |
| // Make their timestamps as old as possible, so that they become LRU |
| casted_replacement_data->lastTouchTick = 1; |
| } |
| } |
| |
| } // namespace replacement_policy |
| } // namespace gem5 |