lru_rp.hh revision 12684
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/** 3212600Sodanrc@yahoo.com.br * @file 3312600Sodanrc@yahoo.com.br * Declaration of a Least Recently Used replacement policy. 3412600Sodanrc@yahoo.com.br * The victim is chosen using the timestamp. The timestamp may be true or 3512600Sodanrc@yahoo.com.br * pseudo, depending on the quantity of bits allocated for that. 3612600Sodanrc@yahoo.com.br */ 3712600Sodanrc@yahoo.com.br 3812600Sodanrc@yahoo.com.br#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_LRU_RP_HH__ 3912600Sodanrc@yahoo.com.br#define __MEM_CACHE_REPLACEMENT_POLICIES_LRU_RP_HH__ 4012600Sodanrc@yahoo.com.br 4112600Sodanrc@yahoo.com.br#include "mem/cache/replacement_policies/base.hh" 4212600Sodanrc@yahoo.com.br#include "params/LRURP.hh" 4312600Sodanrc@yahoo.com.br 4412600Sodanrc@yahoo.com.brclass LRURP : public BaseReplacementPolicy 4512600Sodanrc@yahoo.com.br{ 4612684Sodanrc@yahoo.com.br protected: 4712684Sodanrc@yahoo.com.br /** LRU-specific implementation of replacement data. */ 4812684Sodanrc@yahoo.com.br struct LRUReplData : ReplacementData 4912684Sodanrc@yahoo.com.br { 5012684Sodanrc@yahoo.com.br /** Tick on which the entry was last touched. */ 5112684Sodanrc@yahoo.com.br Tick lastTouchTick; 5212684Sodanrc@yahoo.com.br 5312684Sodanrc@yahoo.com.br /** 5412684Sodanrc@yahoo.com.br * Default constructor. Invalidate data. 5512684Sodanrc@yahoo.com.br */ 5612684Sodanrc@yahoo.com.br LRUReplData() : lastTouchTick(0) {} 5712684Sodanrc@yahoo.com.br }; 5812684Sodanrc@yahoo.com.br 5912600Sodanrc@yahoo.com.br public: 6012600Sodanrc@yahoo.com.br /** Convenience typedef. */ 6112600Sodanrc@yahoo.com.br typedef LRURPParams Params; 6212600Sodanrc@yahoo.com.br 6312600Sodanrc@yahoo.com.br /** 6412600Sodanrc@yahoo.com.br * Construct and initiliaze this replacement policy. 6512600Sodanrc@yahoo.com.br */ 6612600Sodanrc@yahoo.com.br LRURP(const Params *p); 6712600Sodanrc@yahoo.com.br 6812600Sodanrc@yahoo.com.br /** 6912600Sodanrc@yahoo.com.br * Destructor. 7012600Sodanrc@yahoo.com.br */ 7112600Sodanrc@yahoo.com.br ~LRURP() {} 7212600Sodanrc@yahoo.com.br 7312600Sodanrc@yahoo.com.br /** 7412684Sodanrc@yahoo.com.br * Invalidate replacement data to set it as the next probable victim. 7512684Sodanrc@yahoo.com.br * Sets its last touch tick as the starting tick. 7612600Sodanrc@yahoo.com.br * 7712684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be invalidated. 7812600Sodanrc@yahoo.com.br */ 7912684Sodanrc@yahoo.com.br void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 8012684Sodanrc@yahoo.com.br const override; 8112600Sodanrc@yahoo.com.br 8212600Sodanrc@yahoo.com.br /** 8312684Sodanrc@yahoo.com.br * Touch an entry to update its replacement data. 8412600Sodanrc@yahoo.com.br * Sets its last touch tick as the current tick. 8512600Sodanrc@yahoo.com.br * 8612684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be touched. 8712600Sodanrc@yahoo.com.br */ 8812684Sodanrc@yahoo.com.br void touch(const std::shared_ptr<ReplacementData>& replacement_data) const 8912684Sodanrc@yahoo.com.br override; 9012684Sodanrc@yahoo.com.br 9112684Sodanrc@yahoo.com.br /** 9212684Sodanrc@yahoo.com.br * Reset replacement data. Used when an entry is inserted. 9312684Sodanrc@yahoo.com.br * Sets its last touch tick as the current tick. 9412684Sodanrc@yahoo.com.br * 9512684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be reset. 9612684Sodanrc@yahoo.com.br */ 9712684Sodanrc@yahoo.com.br void reset(const std::shared_ptr<ReplacementData>& replacement_data) const 9812684Sodanrc@yahoo.com.br override; 9912600Sodanrc@yahoo.com.br 10012600Sodanrc@yahoo.com.br /** 10112600Sodanrc@yahoo.com.br * Find replacement victim using LRU timestamps. 10212600Sodanrc@yahoo.com.br * 10312600Sodanrc@yahoo.com.br * @param candidates Replacement candidates, selected by indexing policy. 10412684Sodanrc@yahoo.com.br * @return Replacement entry to be replaced. 10512600Sodanrc@yahoo.com.br */ 10612684Sodanrc@yahoo.com.br ReplaceableEntry* getVictim(const ReplacementCandidates& candidates) const 10712684Sodanrc@yahoo.com.br override; 10812684Sodanrc@yahoo.com.br 10912684Sodanrc@yahoo.com.br /** 11012684Sodanrc@yahoo.com.br * Instantiate a replacement data entry. 11112684Sodanrc@yahoo.com.br * 11212684Sodanrc@yahoo.com.br * @return A shared pointer to the new replacement data. 11312684Sodanrc@yahoo.com.br */ 11412684Sodanrc@yahoo.com.br std::shared_ptr<ReplacementData> instantiateEntry() override; 11512600Sodanrc@yahoo.com.br}; 11612600Sodanrc@yahoo.com.br 11712600Sodanrc@yahoo.com.br#endif // __MEM_CACHE_REPLACEMENT_POLICIES_LRU_RP_HH__ 118