random_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 random replacement policy. 3412600Sodanrc@yahoo.com.br * The victim is chosen at random, if there are no invalid entries. 3512600Sodanrc@yahoo.com.br */ 3612600Sodanrc@yahoo.com.br 3712600Sodanrc@yahoo.com.br#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_RANDOM_RP_HH__ 3812600Sodanrc@yahoo.com.br#define __MEM_CACHE_REPLACEMENT_POLICIES_RANDOM_RP_HH__ 3912600Sodanrc@yahoo.com.br 4012600Sodanrc@yahoo.com.br#include "mem/cache/replacement_policies/base.hh" 4112600Sodanrc@yahoo.com.br#include "params/RandomRP.hh" 4212600Sodanrc@yahoo.com.br 4312600Sodanrc@yahoo.com.brclass RandomRP : public BaseReplacementPolicy 4412600Sodanrc@yahoo.com.br{ 4512684Sodanrc@yahoo.com.br protected: 4612684Sodanrc@yahoo.com.br /** MRU-specific implementation of replacement data. */ 4712684Sodanrc@yahoo.com.br struct RandomReplData : ReplacementData 4812684Sodanrc@yahoo.com.br { 4912684Sodanrc@yahoo.com.br /** 5012684Sodanrc@yahoo.com.br * Flag informing if the replacement data is valid or not. 5112684Sodanrc@yahoo.com.br * Invalid entries are prioritized to be evicted. 5212684Sodanrc@yahoo.com.br */ 5312684Sodanrc@yahoo.com.br bool valid; 5412684Sodanrc@yahoo.com.br 5512684Sodanrc@yahoo.com.br /** 5612684Sodanrc@yahoo.com.br * Default constructor. Invalidate data. 5712684Sodanrc@yahoo.com.br */ 5812684Sodanrc@yahoo.com.br RandomReplData() : valid(false) {} 5912684Sodanrc@yahoo.com.br }; 6012684Sodanrc@yahoo.com.br 6112600Sodanrc@yahoo.com.br public: 6212600Sodanrc@yahoo.com.br /** Convenience typedef. */ 6312600Sodanrc@yahoo.com.br typedef RandomRPParams Params; 6412600Sodanrc@yahoo.com.br 6512600Sodanrc@yahoo.com.br /** 6612600Sodanrc@yahoo.com.br * Construct and initiliaze this replacement policy. 6712600Sodanrc@yahoo.com.br */ 6812600Sodanrc@yahoo.com.br RandomRP(const Params *p); 6912600Sodanrc@yahoo.com.br 7012600Sodanrc@yahoo.com.br /** 7112600Sodanrc@yahoo.com.br * Destructor. 7212600Sodanrc@yahoo.com.br */ 7312600Sodanrc@yahoo.com.br ~RandomRP() {} 7412600Sodanrc@yahoo.com.br 7512600Sodanrc@yahoo.com.br /** 7612684Sodanrc@yahoo.com.br * Invalidate replacement data to set it as the next probable victim. 7712684Sodanrc@yahoo.com.br * Prioritize replacement data for victimization. 7812684Sodanrc@yahoo.com.br * 7912684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be invalidated. 8012684Sodanrc@yahoo.com.br */ 8112684Sodanrc@yahoo.com.br void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 8212684Sodanrc@yahoo.com.br const override; 8312684Sodanrc@yahoo.com.br 8412684Sodanrc@yahoo.com.br /** 8512684Sodanrc@yahoo.com.br * Touch an entry to update its replacement data. 8612684Sodanrc@yahoo.com.br * Does not do anything. 8712684Sodanrc@yahoo.com.br * 8812684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be touched. 8912684Sodanrc@yahoo.com.br */ 9012684Sodanrc@yahoo.com.br void touch(const std::shared_ptr<ReplacementData>& replacement_data) const 9112684Sodanrc@yahoo.com.br override; 9212684Sodanrc@yahoo.com.br 9312684Sodanrc@yahoo.com.br /** 9412684Sodanrc@yahoo.com.br * Reset replacement data. Used when an entry is inserted. 9512684Sodanrc@yahoo.com.br * Unprioritize replacement data for victimization. 9612684Sodanrc@yahoo.com.br * 9712684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be reset. 9812684Sodanrc@yahoo.com.br */ 9912684Sodanrc@yahoo.com.br void reset(const std::shared_ptr<ReplacementData>& replacement_data) const 10012684Sodanrc@yahoo.com.br override; 10112684Sodanrc@yahoo.com.br 10212684Sodanrc@yahoo.com.br /** 10312600Sodanrc@yahoo.com.br * Find replacement victim at random. 10412684Sodanrc@yahoo.com.br * 10512600Sodanrc@yahoo.com.br * @param candidates Replacement candidates, selected by indexing policy. 10612684Sodanrc@yahoo.com.br * @return Replacement entry to be replaced. 10712600Sodanrc@yahoo.com.br */ 10812684Sodanrc@yahoo.com.br ReplaceableEntry* getVictim(const ReplacementCandidates& candidates) const 10912684Sodanrc@yahoo.com.br override; 11012684Sodanrc@yahoo.com.br 11112684Sodanrc@yahoo.com.br /** 11212684Sodanrc@yahoo.com.br * Instantiate a replacement data entry. 11312684Sodanrc@yahoo.com.br * 11412684Sodanrc@yahoo.com.br * @return A shared pointer to the new replacement data. 11512684Sodanrc@yahoo.com.br */ 11612684Sodanrc@yahoo.com.br std::shared_ptr<ReplacementData> instantiateEntry() override; 11712600Sodanrc@yahoo.com.br}; 11812600Sodanrc@yahoo.com.br 11912600Sodanrc@yahoo.com.br#endif // __MEM_CACHE_REPLACEMENT_POLICIES_RANDOM_RP_HH__ 120