bip_rp.cc

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#include "mem/cache/replacement_policies/bip_rp.hh"
 
#include <memory>
 
#include "base/random.hh"
#include "params/BIPRP.hh"
#include "sim/cur_tick.hh"
 
namespace gem5
{
 
namespace replacement_policy
{
 
BIP::BIP(const Params &p)
  : LRU(p), btp(p.btp)
{
}
 
void
BIP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const
{
    std::shared_ptr<LRUReplData> casted_replacement_data =
        std::static_pointer_cast<LRUReplData>(replacement_data);
 
    // Entries are inserted as MRU if lower than btp, LRU otherwise
    if (random_mt.random<unsigned>(1, 100) <= btp) {
        casted_replacement_data->lastTouchTick = curTick();
    } else {
        // Make their timestamps as old as possible, so that they become LRU
        casted_replacement_data->lastTouchTick = 1;
    }
}
 
} // namespace replacement_policy
} // namespace gem5