WeightedLRUPolicy.cc revision 12750
111308Santhony.gutierrez@amd.com/* 211308Santhony.gutierrez@amd.com * Copyright (c) 2013-2015 Advanced Micro Devices, Inc. 311308Santhony.gutierrez@amd.com * All rights reserved. 411308Santhony.gutierrez@amd.com * 511308Santhony.gutierrez@amd.com * For use for simulation and test purposes only 611308Santhony.gutierrez@amd.com * 711308Santhony.gutierrez@amd.com * Redistribution and use in source and binary forms, with or without 811308Santhony.gutierrez@amd.com * modification, are permitted provided that the following conditions are met: 911308Santhony.gutierrez@amd.com * 1011308Santhony.gutierrez@amd.com * 1. Redistributions of source code must retain the above copyright notice, 1111308Santhony.gutierrez@amd.com * this list of conditions and the following disclaimer. 1211308Santhony.gutierrez@amd.com * 1311308Santhony.gutierrez@amd.com * 2. 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Neither the name of the copyright holder nor the names of its 1812697Santhony.gutierrez@amd.com * contributors may be used to endorse or promote products derived from this 1912697Santhony.gutierrez@amd.com * software without specific prior written permission. 2011308Santhony.gutierrez@amd.com * 2111308Santhony.gutierrez@amd.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 2211308Santhony.gutierrez@amd.com * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2311308Santhony.gutierrez@amd.com * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2411308Santhony.gutierrez@amd.com * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 2511308Santhony.gutierrez@amd.com * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 2611308Santhony.gutierrez@amd.com * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 2711308Santhony.gutierrez@amd.com * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 2811308Santhony.gutierrez@amd.com * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 2911308Santhony.gutierrez@amd.com * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 3011308Santhony.gutierrez@amd.com * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 3111308Santhony.gutierrez@amd.com * POSSIBILITY OF SUCH DAMAGE. 3211308Santhony.gutierrez@amd.com * 3312697Santhony.gutierrez@amd.com * Authors: Derek Hower 3411308Santhony.gutierrez@amd.com */ 3511308Santhony.gutierrez@amd.com 3611308Santhony.gutierrez@amd.com#include "mem/ruby/system/WeightedLRUPolicy.hh" 3711308Santhony.gutierrez@amd.com 3811308Santhony.gutierrez@amd.comWeightedLRUPolicy::WeightedLRUPolicy(const Params* p) 3911308Santhony.gutierrez@amd.com : AbstractReplacementPolicy(p), m_cache(p->cache) 4011308Santhony.gutierrez@amd.com{ 4111308Santhony.gutierrez@amd.com m_last_occ_ptr = new int*[m_num_sets]; 4211321Ssteve.reinhardt@amd.com for (unsigned i = 0; i < m_num_sets; i++){ 4311308Santhony.gutierrez@amd.com m_last_occ_ptr[i] = new int[m_assoc]; 4411321Ssteve.reinhardt@amd.com for (unsigned j = 0; j < m_assoc; j++){ 4511308Santhony.gutierrez@amd.com m_last_occ_ptr[i][j] = 0; 4611308Santhony.gutierrez@amd.com } 4711308Santhony.gutierrez@amd.com } 4811308Santhony.gutierrez@amd.com} 4911308Santhony.gutierrez@amd.com 5011308Santhony.gutierrez@amd.comWeightedLRUPolicy * 5111308Santhony.gutierrez@amd.comWeightedLRUReplacementPolicyParams::create() 5211308Santhony.gutierrez@amd.com{ 5311308Santhony.gutierrez@amd.com return new WeightedLRUPolicy(this); 5411308Santhony.gutierrez@amd.com} 5511308Santhony.gutierrez@amd.com 5611308Santhony.gutierrez@amd.comWeightedLRUPolicy::~WeightedLRUPolicy() 5711308Santhony.gutierrez@amd.com{ 5811308Santhony.gutierrez@amd.com if (m_last_occ_ptr != NULL){ 5911308Santhony.gutierrez@amd.com for (unsigned i = 0; i < m_num_sets; i++){ 6011308Santhony.gutierrez@amd.com if (m_last_occ_ptr[i] != NULL){ 6111308Santhony.gutierrez@amd.com delete[] m_last_occ_ptr[i]; 6211308Santhony.gutierrez@amd.com } 6311308Santhony.gutierrez@amd.com } 6411308Santhony.gutierrez@amd.com delete[] m_last_occ_ptr; 6511308Santhony.gutierrez@amd.com } 6611308Santhony.gutierrez@amd.com} 6711308Santhony.gutierrez@amd.com 6811308Santhony.gutierrez@amd.comvoid 6911308Santhony.gutierrez@amd.comWeightedLRUPolicy::touch(int64_t set, int64_t index, Tick time) 7011308Santhony.gutierrez@amd.com{ 7111308Santhony.gutierrez@amd.com assert(index >= 0 && index < m_assoc); 7211308Santhony.gutierrez@amd.com assert(set >= 0 && set < m_num_sets); 7311308Santhony.gutierrez@amd.com 7411308Santhony.gutierrez@amd.com m_last_ref_ptr[set][index] = time; 7511308Santhony.gutierrez@amd.com} 7611308Santhony.gutierrez@amd.com 7711308Santhony.gutierrez@amd.comvoid 7811308Santhony.gutierrez@amd.comWeightedLRUPolicy::touch(int64_t set, int64_t index, Tick time, int occupancy) 7911308Santhony.gutierrez@amd.com{ 8011308Santhony.gutierrez@amd.com assert(index >= 0 && index < m_assoc); 8111308Santhony.gutierrez@amd.com assert(set >= 0 && set < m_num_sets); 8211308Santhony.gutierrez@amd.com 8311308Santhony.gutierrez@amd.com m_last_ref_ptr[set][index] = time; 8411308Santhony.gutierrez@amd.com m_last_occ_ptr[set][index] = occupancy; 8511308Santhony.gutierrez@amd.com} 8611308Santhony.gutierrez@amd.com 8711308Santhony.gutierrez@amd.comint64_t 8811308Santhony.gutierrez@amd.comWeightedLRUPolicy::getVictim(int64_t set) const 8911308Santhony.gutierrez@amd.com{ 9011308Santhony.gutierrez@amd.com Tick time, smallest_time; 9111308Santhony.gutierrez@amd.com int64_t smallest_index; 9211308Santhony.gutierrez@amd.com 9311308Santhony.gutierrez@amd.com smallest_index = 0; 9411308Santhony.gutierrez@amd.com smallest_time = m_last_ref_ptr[set][0]; 9512750Sodanrc@yahoo.com.br int smallest_weight = m_last_occ_ptr[set][0]; 9611308Santhony.gutierrez@amd.com 9711308Santhony.gutierrez@amd.com for (unsigned i = 1; i < m_assoc; i++) { 9811308Santhony.gutierrez@amd.com 9911308Santhony.gutierrez@amd.com int weight = m_last_occ_ptr[set][i]; 10011308Santhony.gutierrez@amd.com if (weight < smallest_weight) { 10111308Santhony.gutierrez@amd.com smallest_weight = weight; 10211308Santhony.gutierrez@amd.com smallest_index = i; 10311308Santhony.gutierrez@amd.com smallest_time = m_last_ref_ptr[set][i]; 10411308Santhony.gutierrez@amd.com } else if (weight == smallest_weight) { 10511308Santhony.gutierrez@amd.com time = m_last_ref_ptr[set][i]; 10611308Santhony.gutierrez@amd.com if (time < smallest_time) { 10711308Santhony.gutierrez@amd.com smallest_index = i; 10811308Santhony.gutierrez@amd.com smallest_time = time; 10911308Santhony.gutierrez@amd.com } 11011308Santhony.gutierrez@amd.com } 11111308Santhony.gutierrez@amd.com } 11211308Santhony.gutierrez@amd.com return smallest_index; 11311308Santhony.gutierrez@amd.com} 114