weighted_lru_rp.hh

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/*
 * Copyright (c) 2013-2015 Advanced Micro Devices, Inc.
 * All rights reserved.
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 * For use for simulation and test purposes only
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 * and/or other materials provided with the distribution.
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 * software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * Authors: Sooraj Puthoor
 */

#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_WEIGHTED_LRU_RP_HH__
#define __MEM_CACHE_REPLACEMENT_POLICIES_WEIGHTED_LRU_RP_HH__

#include <memory>

#include "base/types.hh"
#include "mem/cache/replacement_policies/base.hh"

struct WeightedLRURPParams;

class WeightedLRUPolicy : public BaseReplacementPolicy
{
  protected:
    struct WeightedLRUReplData : ReplacementData
    {
        int last_occ_ptr;

        Tick last_touch_tick;

        WeightedLRUReplData() : ReplacementData(),
                                last_occ_ptr(0), last_touch_tick(0) {}
    };
  public:
    typedef WeightedLRURPParams Params;
    WeightedLRUPolicy(const Params* p);
    ~WeightedLRUPolicy() {}

    void invalidate(const std::shared_ptr<ReplacementData>& replacement_data)
                                                              const override;
    void touch(const std::shared_ptr<ReplacementData>&
                                        replacement_data) const override;
    void touch(const std::shared_ptr<ReplacementData>& replacement_data,
                                        int occupancy) const;

    void reset(const std::shared_ptr<ReplacementData>& replacement_data) const
                                                                     override;

    std::shared_ptr<ReplacementData> instantiateEntry() override;

    ReplaceableEntry* getVictim(const ReplacementCandidates&
                                              candidates) const override;
};

#endif // __MEM_CACHE_REPLACEMENT_POLICIES_WEIGHTED_LRU_RP_HH__