brrip_rp.hh File Reference

Copyright (c) 2018-2020 Inria All rights reserved. More...

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

Go to the source code of this file.

Classes
class	gem5::replacement_policy::BRRIP
struct	gem5::replacement_policy::BRRIP::BRRIPReplData
	BRRIP-specific implementation of replacement data. More...

Namespaces
namespace	gem5
	Copyright (c) 2024 - Pranith Kumar Copyright (c) 2020 Inria All rights reserved.
namespace	gem5::replacement_policy

Detailed Description

Copyright (c) 2018-2020 Inria All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer; redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution; neither the name of the copyright holders nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

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Declaration of a Re-Reference Interval Prediction replacement policy.

Not-Recently Used (NRU) is an approximation of LRU that uses a single bit to determine if an entry is going to be re-referenced in the near or distant future.

Re-Reference Interval Prediction (RRIP) is an extension of NRU that uses a re-reference prediction value to determine if entries are going to be re- used in the near future or not.

The higher the value of the RRPV, the more distant the entry is from its next access.

Bimodal Re-Reference Interval Prediction (BRRIP) is an extension of RRIP that has a probability of not inserting entries as the LRU. This probability is controlled by the bimodal throtle parameter (btp).

From the original paper, this implementation of RRIP is also called Static RRIP (SRRIP), as it always inserts entries with the same RRPV.

Definition in file brrip_rp.hh.