LRUPolicy.cc revision 10970:ea8bdb1d9f1e
1/* 2 * Copyright (c) 2013 Advanced Micro Devices, Inc 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 * Author: Derek Hower 29 */ 30 31#include "mem/ruby/structures/LRUPolicy.hh" 32 33 34 35LRUPolicy::LRUPolicy(const Params * p) 36 : AbstractReplacementPolicy(p) 37{ 38} 39 40 41LRUPolicy::~LRUPolicy() 42{ 43} 44 45LRUPolicy * 46LRUReplacementPolicyParams::create() 47{ 48 return new LRUPolicy(this); 49} 50 51 52void 53LRUPolicy::touch(int64 set, int64 index, Tick time) 54{ 55 assert(index >= 0 && index < m_assoc); 56 assert(set >= 0 && set < m_num_sets); 57 58 m_last_ref_ptr[set][index] = time; 59} 60 61int64 62LRUPolicy::getVictim(int64 set) const 63{ 64 Tick time, smallest_time; 65 int64 smallest_index; 66 67 smallest_index = 0; 68 smallest_time = m_last_ref_ptr[set][0]; 69 70 for (unsigned i = 0; i < m_assoc; i++) { 71 time = m_last_ref_ptr[set][i]; 72 73 if (time < smallest_time) { 74 smallest_index = i; 75 smallest_time = time; 76 } 77 } 78 79 return smallest_index; 80} 81