mru_rp.hh revision 12727
112601Sodanrc@yahoo.com.br/** 212601Sodanrc@yahoo.com.br * Copyright (c) 2018 Inria 312601Sodanrc@yahoo.com.br * All rights reserved. 412601Sodanrc@yahoo.com.br * 512601Sodanrc@yahoo.com.br * Redistribution and use in source and binary forms, with or without 612601Sodanrc@yahoo.com.br * modification, are permitted provided that the following conditions are 712601Sodanrc@yahoo.com.br * met: redistributions of source code must retain the above copyright 812601Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer; 912601Sodanrc@yahoo.com.br * redistributions in binary form must reproduce the above copyright 1012601Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer in the 1112601Sodanrc@yahoo.com.br * documentation and/or other materials provided with the distribution; 1212601Sodanrc@yahoo.com.br * neither the name of the copyright holders nor the names of its 1312601Sodanrc@yahoo.com.br * contributors may be used to endorse or promote products derived from 1412601Sodanrc@yahoo.com.br * this software without specific prior written permission. 1512601Sodanrc@yahoo.com.br * 1612601Sodanrc@yahoo.com.br * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1712601Sodanrc@yahoo.com.br * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1812601Sodanrc@yahoo.com.br * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1912601Sodanrc@yahoo.com.br * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2012601Sodanrc@yahoo.com.br * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2112601Sodanrc@yahoo.com.br * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2212601Sodanrc@yahoo.com.br * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2312601Sodanrc@yahoo.com.br * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2412601Sodanrc@yahoo.com.br * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2512601Sodanrc@yahoo.com.br * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2612601Sodanrc@yahoo.com.br * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2712601Sodanrc@yahoo.com.br * 2812601Sodanrc@yahoo.com.br * Authors: Daniel Carvalho 2912601Sodanrc@yahoo.com.br */ 3012601Sodanrc@yahoo.com.br 3112601Sodanrc@yahoo.com.br/** 3212601Sodanrc@yahoo.com.br * @file 3312601Sodanrc@yahoo.com.br * Declaration of a Most Recently Used replacement policy. 3412684Sodanrc@yahoo.com.br * The victim is chosen using the timestamp. The entry that was accessed the 3512601Sodanrc@yahoo.com.br * last is the one chosen to be replaced. 3612601Sodanrc@yahoo.com.br */ 3712601Sodanrc@yahoo.com.br 3812601Sodanrc@yahoo.com.br#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 3912601Sodanrc@yahoo.com.br#define __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 4012601Sodanrc@yahoo.com.br 4112727Snikos.nikoleris@arm.com#include "base/types.hh" 4212601Sodanrc@yahoo.com.br#include "mem/cache/replacement_policies/base.hh" 4312727Snikos.nikoleris@arm.com 4412727Snikos.nikoleris@arm.comstruct MRURPParams; 4512601Sodanrc@yahoo.com.br 4612601Sodanrc@yahoo.com.brclass MRURP : public BaseReplacementPolicy 4712601Sodanrc@yahoo.com.br{ 4812684Sodanrc@yahoo.com.br protected: 4912684Sodanrc@yahoo.com.br /** MRU-specific implementation of replacement data. */ 5012684Sodanrc@yahoo.com.br struct MRUReplData : ReplacementData 5112684Sodanrc@yahoo.com.br { 5212684Sodanrc@yahoo.com.br /** Tick on which the entry was last touched. */ 5312684Sodanrc@yahoo.com.br Tick lastTouchTick; 5412684Sodanrc@yahoo.com.br 5512684Sodanrc@yahoo.com.br /** 5612684Sodanrc@yahoo.com.br * Default constructor. Invalidate data. 5712684Sodanrc@yahoo.com.br */ 5812684Sodanrc@yahoo.com.br MRUReplData() : lastTouchTick(0) {} 5912684Sodanrc@yahoo.com.br }; 6012684Sodanrc@yahoo.com.br 6112601Sodanrc@yahoo.com.br public: 6212601Sodanrc@yahoo.com.br /** Convenience typedef. */ 6312601Sodanrc@yahoo.com.br typedef MRURPParams Params; 6412601Sodanrc@yahoo.com.br 6512601Sodanrc@yahoo.com.br /** 6612601Sodanrc@yahoo.com.br * Construct and initiliaze this replacement policy. 6712601Sodanrc@yahoo.com.br */ 6812601Sodanrc@yahoo.com.br MRURP(const Params *p); 6912601Sodanrc@yahoo.com.br 7012601Sodanrc@yahoo.com.br /** 7112601Sodanrc@yahoo.com.br * Destructor. 7212601Sodanrc@yahoo.com.br */ 7312601Sodanrc@yahoo.com.br ~MRURP() {} 7412601Sodanrc@yahoo.com.br 7512601Sodanrc@yahoo.com.br /** 7612684Sodanrc@yahoo.com.br * Invalidate replacement data to set it as the next probable victim. 7712684Sodanrc@yahoo.com.br * Sets its last touch tick as the starting tick. 7812601Sodanrc@yahoo.com.br * 7912684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be invalidated. 8012601Sodanrc@yahoo.com.br */ 8112684Sodanrc@yahoo.com.br void invalidate(const std::shared_ptr<ReplacementData>& replacement_data) 8212684Sodanrc@yahoo.com.br const override; 8312601Sodanrc@yahoo.com.br 8412601Sodanrc@yahoo.com.br /** 8512684Sodanrc@yahoo.com.br * Touch an entry to update its replacement data. 8612601Sodanrc@yahoo.com.br * Sets its last touch tick as the current tick. 8712601Sodanrc@yahoo.com.br * 8812684Sodanrc@yahoo.com.br * @param replacement_data Replacement data to be touched. 8912601Sodanrc@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 * Sets its last touch tick as the current tick. 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; 10112601Sodanrc@yahoo.com.br 10212601Sodanrc@yahoo.com.br /** 10312601Sodanrc@yahoo.com.br * Find replacement victim using access timestamps. 10412684Sodanrc@yahoo.com.br * 10512601Sodanrc@yahoo.com.br * @param cands Replacement candidates, selected by indexing policy. 10612684Sodanrc@yahoo.com.br * @return Replacement entry to be replaced. 10712601Sodanrc@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; 11712601Sodanrc@yahoo.com.br}; 11812601Sodanrc@yahoo.com.br 11912601Sodanrc@yahoo.com.br#endif // __MEM_CACHE_REPLACEMENT_POLICIES_MRU_RP_HH__ 120