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Diffstat (limited to 'src/mem/cache/replacement_policies/bip_rp.hh')
-rw-r--r-- | src/mem/cache/replacement_policies/bip_rp.hh | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/mem/cache/replacement_policies/bip_rp.hh b/src/mem/cache/replacement_policies/bip_rp.hh new file mode 100644 index 000000000..f6e2a9c64 --- /dev/null +++ b/src/mem/cache/replacement_policies/bip_rp.hh @@ -0,0 +1,84 @@ +/** + * Copyright (c) 2018 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. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Daniel Carvalho + */ + +/** + * @file + * Declaration of a Bimodal Interval Prediction replacement policy. + * Has a probability of when placing new blocks, placing them as MRU. + * + * Although both LRU and LIP can be seen as specific cases of BIP + * where the bimodal throtle parameter are 1 and 0, respectively, we + * decide not to inherit from it, and do the other way around (inherit + * from LRU) for efficiency reasons. + * + * In the original paper they use btp = 1/32 ~= 3%. + */ + +#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_LIP_RP_HH__ +#define __MEM_CACHE_REPLACEMENT_POLICIES_LIP_RP_HH__ + +#include "mem/cache/replacement_policies/lru_rp.hh" +#include "params/BIPRP.hh" + +class BIPRP : public LRURP +{ + protected: + /** + * Bimodal throtle parameter. Value in the range [0,100] used to decide + * if a new block is inserted at the MRU or LRU position. + */ + const unsigned btp; + + public: + /** Convenience typedef. */ + typedef BIPRPParams Params; + + /** + * Construct and initiliaze this replacement policy. + */ + BIPRP(const Params *p); + + /** + * Destructor. + */ + ~BIPRP() {} + + /** + * Reset replacement data for a block. Used when a block is inserted. + * Sets the insertion tick, and update correspondent replacement data. + * Uses the bimodal throtle parameter to decide whether the new block + * should be inserted as MRU, or LRU. + * + * @param blk Cache block to be reset. + */ + void reset(CacheBlk *blk) override; +}; + +#endif // __MEM_CACHE_REPLACEMENT_POLICIES_LIP_RP_HH__ |