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/*
* Copyright (c) 2013-2015 Advanced Micro Devices, Inc.
* All rights reserved.
*
* For use for simulation and test purposes only
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER 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: Derek Hower
*/
#include "mem/ruby/system/WeightedLRUPolicy.hh"
WeightedLRUPolicy::WeightedLRUPolicy(const Params* p)
: AbstractReplacementPolicy(p), m_cache(p->cache)
{
m_last_occ_ptr = new int*[m_num_sets];
for (unsigned i = 0; i < m_num_sets; i++){
m_last_occ_ptr[i] = new int[m_assoc];
for (unsigned j = 0; j < m_assoc; j++){
m_last_occ_ptr[i][j] = 0;
}
}
}
WeightedLRUPolicy *
WeightedLRUReplacementPolicyParams::create()
{
return new WeightedLRUPolicy(this);
}
WeightedLRUPolicy::~WeightedLRUPolicy()
{
if (m_last_occ_ptr != NULL){
for (unsigned i = 0; i < m_num_sets; i++){
if (m_last_occ_ptr[i] != NULL){
delete[] m_last_occ_ptr[i];
}
}
delete[] m_last_occ_ptr;
}
}
void
WeightedLRUPolicy::touch(int64_t set, int64_t index, Tick time)
{
assert(index >= 0 && index < m_assoc);
assert(set >= 0 && set < m_num_sets);
m_last_ref_ptr[set][index] = time;
}
void
WeightedLRUPolicy::touch(int64_t set, int64_t index, Tick time, int occupancy)
{
assert(index >= 0 && index < m_assoc);
assert(set >= 0 && set < m_num_sets);
m_last_ref_ptr[set][index] = time;
m_last_occ_ptr[set][index] = occupancy;
}
int64_t
WeightedLRUPolicy::getVictim(int64_t set) const
{
Tick time, smallest_time;
int64_t smallest_index;
smallest_index = 0;
smallest_time = m_last_ref_ptr[set][0];
int smallest_weight = m_last_occ_ptr[set][0];
for (unsigned i = 1; i < m_assoc; i++) {
int weight = m_last_occ_ptr[set][i];
if (weight < smallest_weight) {
smallest_weight = weight;
smallest_index = i;
smallest_time = m_last_ref_ptr[set][i];
} else if (weight == smallest_weight) {
time = m_last_ref_ptr[set][i];
if (time < smallest_time) {
smallest_index = i;
smallest_time = time;
}
}
}
return smallest_index;
}
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