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cache.cc
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#include "cache.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include<vector>
#include <string>
//uint64_t l2pf_access = 0;
using namespace std;
int lg2(int n)
{
int i, m = n, c = -1;
for (i=0; m; i++) {
m /= 2;
c++;
}
return c;
}
void CACHE::handle_read(fstream &fin)
{
// handle read
uint32_t read_cpu = 0;
// if (read_cpu == NUM_CPUS)
// return;
string line;
llc_prefetcher_initialize(read_cpu);
long double cnt_acc=0,cnt_miss=0;
while(getline(fin, line)){
stringstream s(line);
string word;
uint64_t ip = 0;
uint64_t index = 0;
s >> word;
ip = stol(word);
s >> word;
index = stol(word);
//cout<<"ip: " <<ip<< " address: "<<index<<endl;
// access cache
uint32_t set = get_set(index);
int way = check_hit(index);
//cout<<" got way and set, ****** set:"<<set<<" way:" <<way<<endl;
if (way >= 0) { // read hit
// update prefetcher on load instruction
uint64_t pf_addr=llc_prefetcher_operate(read_cpu,index, ip, 1, LOAD);//Bingo
// uint32_t pf_set = get_set(pf_addr);
// int pf_way = check_hit(pf_addr);
handle_prefech(cnt_acc,cnt_miss,pf_addr,ip);
// update replacement policyx
llc_update_replacement_state(read_cpu, set, way, index, ip, 0, LOAD, 1);
// COLLECT STATS
// sim_hit[read_cpu][RQ.entry[index].type]++;
// sim_access[read_cpu][RQ.entry[index].type]++;
// update prefetch stats and reset prefetch bit
if (block[set][way].prefetch) {
pf_useful++;
block[set][way].prefetch = 0;
}
block[set][way].used = 1;
HIT[LOAD]++;
ACCESS[LOAD]++;
cnt_acc++;
// remove this entry from RQ
}
else { // read miss
// check mshr
uint8_t miss_handled = 1;
// find victim
way = llc_find_victim(read_cpu, set, block[set], ip, index, LOAD);
//cout<<"the newly found way is "<< way <<endl;
if(way==LLC_WAY) {
llc_update_replacement_state(read_cpu, set, way, index, ip, 0, LOAD, 0);
}
uint8_t do_fill = 1;
if(do_fill){
//cout<<"the block info : set "<<set<<" way: "<<way<<" block[set][way]: "<<block[set][way].full_addr<<endl;
llc_prefetcher_cache_fill(read_cpu,index, set, way, 1 , block[set][way].full_addr);//Bingo
llc_update_replacement_state(cpu, set, way, index, ip, block[set][way].full_addr, LOAD, 0);
fill_cache(set, way, index);
block[set][way].dirty = 1;
cnt_miss++;
}
if (miss_handled){
// update prefetcher on load instruction
uint64_t pf_addr=llc_prefetcher_operate(read_cpu, index, ip, 0, LOAD);//Bingo
handle_prefech(cnt_acc,cnt_miss,pf_addr,ip);
MISS[LOAD]++;
ACCESS[LOAD]++;
}
}
}
cout<<"hit rate: "<< cnt_acc/(cnt_acc+cnt_miss)<<endl;
cout<<cnt_acc<<endl;
}
void CACHE::handle_prefech(double long &cnt_acc, double long &cnt_miss,uint64_t pf_addr,uint64_t ip){
uint32_t set = get_set(pf_addr);
int way = check_hit(ip);
if (way >= 0) {
//prefetch hit
llc_update_replacement_state(cpu, set, way, block[set][way].full_addr, ip, 0,LOAD , 1);
cnt_acc++;
}else{
// prefetch miss
way = llc_find_victim(cpu, set, block[set], ip, pf_addr, LOAD);
llc_prefetcher_cache_fill(cpu,pf_addr, set, way, 1 , block[set][way].full_addr);//Bingo
fill_cache(set, way, pf_addr);
block[set][way].dirty = 1;
cnt_miss++;
}
}
void CACHE::operate()
{
// handle_fill();
// handle_writeback();
fstream fin;
string filename="../matrix0001.txt";
fin.open(filename, ios::in);
handle_read(fin);
// if (PQ.occupancy && (RQ.occupancy == 0))
// handle_prefetch();
}
uint32_t CACHE::get_set(uint64_t address)
{
return (uint32_t) (address & ((1 << lg2(NUM_SET)) - 1));
}
uint32_t CACHE::get_way(uint64_t address, uint32_t set)
{
for (uint32_t way=0; way<NUM_WAY; way++) {
if (block[set][way].valid && (block[set][way].tag == address))
return way;
}
return NUM_WAY;
}
void CACHE::fill_cache(uint32_t set, uint32_t way, uint64_t addr)
{
if (block[set][way].prefetch && (block[set][way].used == 0))
pf_useless++;
if (block[set][way].valid == 0)
block[set][way].valid = 1;
block[set][way].dirty = 0;
// block[set][way].prefetch = (packet->type == PREFETCH) ? 1 : 0;
block[set][way].used = 0;
if (block[set][way].prefetch)
pf_fill++;
//block[set][way].delta = packet->delta;
//block[set][way].depth = packet->depth;
//block[set][way].signature = packet->signature;
//block[set][way].confidence = packet->confidence;
block[set][way].tag = addr;
block[set][way].address = addr;
block[set][way].full_addr = addr;
//block[set][way].data = packet->data;
block[set][way].cpu = cpu;
//block[set][way].instr_id = packet->instr_id;
DP ( if (warmup_complete[packet->cpu]) {
cout << "[" << NAME << "] " << __func__ << " set: " << set << " way: " << way;
cout << " lru: " << block[set][way].lru << " tag: " << hex << block[set][way].tag << " full_addr: " << block[set][way].full_addr;
cout << " data: " << block[set][way].data << dec << "\tpacket->cpu = " << packet->cpu << endl; });
}
int CACHE::check_hit(uint64_t index)
{
uint32_t set = get_set(index);
int match_way = -1;
if (NUM_SET < set) {
cerr << "[" << NAME << "_ERROR] " << __func__ << " invalid set index: " << set << " NUM_SET: " << NUM_SET;
cerr << " address: " << hex << index << " full_addr: " << index << dec;
// cerr << " event: " << packet->event_cycle << endl;
assert(0);
}
// hit
for (uint32_t way=0; way<NUM_WAY; way++) {
if (block[set][way].valid && (block[set][way].tag == index)) {
match_way = way;
DP ( if (warmup_complete[packet->cpu]) {
cout << "[" << NAME << "] " << __func__ << " instr_id: " << packet->instr_id << " type: " << +packet->type << hex << " addr: " << packet->address;
cout << " full_addr: " << packet->full_addr << " tag: " << block[set][way].tag << " data: " << block[set][way].data << dec;
cout << " set: " << set << " way: " << way << " lru: " << block[set][way].lru;
cout << " event: " << packet->event_cycle << " cycle: " << current_core_cycle[cpu] << "\tpacket->cpu = " << packet->cpu << endl; });
break;
}
}
return match_way;
}
int CACHE::invalidate_entry(uint64_t inval_addr)
{
uint32_t set = get_set(inval_addr);
int match_way = -1;
if (NUM_SET < set) {
cerr << "[" << NAME << "_ERROR] " << __func__ << " invalid set index: " << set << " NUM_SET: " << NUM_SET;
cerr << " inval_addr: " << hex << inval_addr << dec << endl;
assert(0);
}
// invalidate
for (uint32_t way=0; way<NUM_WAY; way++) {
if (block[set][way].valid && (block[set][way].tag == inval_addr)) {
block[set][way].valid = 0;
match_way = way;
DP ( if (warmup_complete[cpu]) {
cout << "[" << NAME << "] " << __func__ << " inval_addr: " << hex << inval_addr;
cout << " tag: " << block[set][way].tag << " data: " << block[set][way].data << dec;
cout << " set: " << set << " way: " << way << " lru: " << block[set][way].lru << " cycle: " << current_core_cycle[cpu] << "\tcpu = " << cpu << endl; });
break;
}
}
return match_way;
}
int CACHE::prefetch_line(uint32_t cpu, uint64_t ip, uint64_t base_addr, uint64_t pf_addr, int fill_level)
{
pf_requested++;
// cout<<"oooo"<<endl;
if ((base_addr>>LOG2_PAGE_SIZE) == (pf_addr>>LOG2_PAGE_SIZE)) {
// cout<<"iiii"<<endl;
PACKET pf_packet;
pf_packet.fill_level = fill_level;
pf_packet.cpu = cpu;
pf_packet.address = pf_addr >> LOG2_BLOCK_SIZE;
pf_packet.full_addr = pf_addr;
//pf_packet.instr_id = LQ.entry[lq_index].instr_id;
//pf_packet.rob_index = LQ.entry[lq_index].rob_index;
pf_packet.ip = ip;
pf_packet.type = PREFETCH;
//pf_packet.event_cycle = current_core_cycle[cpu]; //Bingo: Handle late prefetches, here.
// give a dummy 0 as the IP of a prefetch
//add_pq(&pf_packet);
pf_issued++;
return 1;
}
return 0;
}
//void CACHE::return_data(PACKET *packet) //Bingo: This function should be heavily modified for LLC, supporting multiple backward messages!
//{
// if (cache_type == IS_LLC)
// {
// std::list<int> requesters;
//
// //Search MSHR
// for (uint32_t index = 0; index < MSHR_SIZE; index++)
// {
// if (MSHR.entry[index].address == packet->address)
// {
// requesters.push_back(index);
// }
// }
//
// if (requesters.size() == 0)
// {
// cerr << "Bingo: Cannot find a matching entry in the MSHR of LLC" << endl;
// assert(0);
// }
//
// while (!requesters.empty())
// {
// int mshr_index = requesters.front();
// requesters.pop_front();
//
// MSHR.num_returned++;
// MSHR.entry[mshr_index].returned = COMPLETED;
// MSHR.entry[mshr_index].data = packet->data;
//
// if (MSHR.entry[mshr_index].event_cycle < current_core_cycle[packet->cpu])
// MSHR.entry[mshr_index].event_cycle = current_core_cycle[packet->cpu] + LATENCY;
// else
// MSHR.entry[mshr_index].event_cycle += LATENCY;
//
// update_fill_cycle();
// }
//
// return;
// }
//
// if (cache_type == IS_LLC)
// {
// cerr << "Bingo: Should not reach here. If the cache is LLC, the function should terminated before here." << endl;
// assert(0);
// }
//
//
// // check MSHR information
// int mshr_index = check_mshr(packet);
//
// // sanity check
// if (mshr_index == -1) {
// cerr << "[" << NAME << "_MSHR] " << __func__ << " instr_id: " << packet->instr_id << " cannot find a matching entry!";
// cerr << " full_addr: " << hex << packet->full_addr;
// cerr << " address: " << packet->address << dec;
// cerr << " event: " << packet->event_cycle << " current: " << current_core_cycle[packet->cpu] << endl;
// assert(0);
// }
//
// // MSHR holds the most updated information about this request
// // no need to do memcpy
// MSHR.num_returned++;
// MSHR.entry[mshr_index].returned = COMPLETED;
// MSHR.entry[mshr_index].data = packet->data;
//
// // ADD LATENCY
// if (MSHR.entry[mshr_index].event_cycle < current_core_cycle[packet->cpu])
// MSHR.entry[mshr_index].event_cycle = current_core_cycle[packet->cpu] + LATENCY;
// else
// MSHR.entry[mshr_index].event_cycle += LATENCY;
//
// update_fill_cycle();
//
// DP (if (warmup_complete[packet->cpu]) {
// cout << "[" << NAME << "_MSHR] " << __func__ << " instr_id: " << MSHR.entry[mshr_index].instr_id;
// cout << " address: " << hex << MSHR.entry[mshr_index].address << " full_addr: " << MSHR.entry[mshr_index].full_addr;
// cout << " data: " << MSHR.entry[mshr_index].data << dec << " num_returned: " << MSHR.num_returned;
// cout << " index: " << mshr_index << " occupancy: " << MSHR.occupancy;
// cout << " event: " << MSHR.entry[mshr_index].event_cycle << " current: " << current_core_cycle[packet->cpu] << " next: " << MSHR.next_fill_cycle << "\tpacket->cpu = " << packet->cpu << endl; });
//}
void CACHE::update_fill_cycle()
{
// update next_fill_cycle
uint64_t min_cycle = UINT64_MAX;
uint32_t min_index = MSHR.SIZE;
for (uint32_t i=0; i<MSHR.SIZE; i++) {
if ((MSHR.entry[i].returned == COMPLETED) && (MSHR.entry[i].event_cycle < min_cycle)) {
min_cycle = MSHR.entry[i].event_cycle;
min_index = i;
}
DP (if (warmup_complete[MSHR.entry[i].cpu]) {
cout << "[" << NAME << "_MSHR] " << __func__ << " checking instr_id: " << MSHR.entry[i].instr_id;
cout << " address: " << hex << MSHR.entry[i].address << " full_addr: " << MSHR.entry[i].full_addr;
cout << " data: " << MSHR.entry[i].data << dec << " returned: " << +MSHR.entry[i].returned << " fill_level: " << MSHR.entry[i].fill_level;
cout << " index: " << i << " occupancy: " << MSHR.occupancy;
cout << " event: " << MSHR.entry[i].event_cycle << " current: " << current_core_cycle[MSHR.entry[i].cpu] << " next: " << MSHR.next_fill_cycle << "\tMSHR.entry[i].cpu = " << MSHR.entry[i].cpu << endl; });
}
MSHR.next_fill_cycle = min_cycle;
MSHR.next_fill_index = min_index;
if (min_index < MSHR.SIZE) {
DP (if (warmup_complete[MSHR.entry[min_index].cpu]) {
cout << "[" << NAME << "_MSHR] " << __func__ << " instr_id: " << MSHR.entry[min_index].instr_id;
cout << " address: " << hex << MSHR.entry[min_index].address << " full_addr: " << MSHR.entry[min_index].full_addr;
cout << " data: " << MSHR.entry[min_index].data << dec << " num_returned: " << MSHR.num_returned;
cout << " event: " << MSHR.entry[min_index].event_cycle << " current: " << current_core_cycle[MSHR.entry[min_index].cpu] << " next: " << MSHR.next_fill_cycle << "\tMSHR.entry[min_index].cpu = " << MSHR.entry[min_index].cpu << endl; });
}
}
//
//int CACHE::check_mshr(PACKET *packet)
//{
// // search mshr
// for (uint32_t index=0; index<MSHR_SIZE; index++) {
// if (MSHR.entry[index].address == packet->address && MSHR.entry[index].cpu == packet->cpu /*Bingo*/) {
//
// DP ( if (warmup_complete[packet->cpu]) {
// cout << "[" << NAME << "_MSHR] " << __func__ << " same entry instr_id: " << packet->instr_id << " prior_id: " << MSHR.entry[index].instr_id;
// cout << " address: " << hex << packet->address;
// cout << " full_addr: " << packet->full_addr << dec << "\tpacket->cpu = " << packet->cpu << endl; });
//
// return index;
// }
// }
//
// DP ( if (warmup_complete[packet->cpu]) {
// cout << "[" << NAME << "_MSHR] " << __func__ << " new address: " << hex << packet->address;
// cout << " full_addr: " << packet->full_addr << dec << "\tpacket->cpu = " << packet->cpu << endl; });
//
// DP ( if (warmup_complete[packet->cpu] && (MSHR.occupancy == MSHR_SIZE)) {
// cout << "[" << NAME << "_MSHR] " << __func__ << " mshr is full";
// cout << " instr_id: " << packet->instr_id << " mshr occupancy: " << MSHR.occupancy;
// cout << " address: " << hex << packet->address;
// cout << " full_addr: " << packet->full_addr << dec;
// cout << " cycle: " << current_core_cycle[packet->cpu] << "\tpacket->cpu = " << packet->cpu << endl; });
//
// return -1;
//}
//
//void CACHE::add_mshr(PACKET *packet)
//{
// uint32_t index = 0;
//
// // search mshr
// for (index=0; index<MSHR_SIZE; index++) {
// if (MSHR.entry[index].address == 0) {
//
// memcpy(&MSHR.entry[index], packet, sizeof(PACKET));
// MSHR.entry[index].returned = INFLIGHT;
// MSHR.occupancy++;
//
// DP ( if (warmup_complete[packet->cpu]) {
// cout << "[" << NAME << "_MSHR] " << __func__ << " instr_id: " << packet->instr_id;
// cout << " address: " << hex << packet->address << " full_addr: " << packet->full_addr << dec;
// cout << " index: " << index << " occupancy: " << MSHR.occupancy << "\tpacket->cpu = " << packet->cpu << endl; });
//
// break;
// }
// }
//}
uint32_t CACHE::get_occupancy(uint8_t queue_type, uint64_t address)
{
if (queue_type == 0)
return MSHR.occupancy;
else if (queue_type == 1)
return RQ.occupancy;
else if (queue_type == 2)
return WQ.occupancy;
else if (queue_type == 3)
return PQ.occupancy;
return 0;
}
uint32_t CACHE::get_size(uint8_t queue_type, uint64_t address)
{
if (queue_type == 0)
return MSHR.SIZE;
else if (queue_type == 1)
return RQ.SIZE;
else if (queue_type == 2)
return WQ.SIZE;
else if (queue_type == 3)
return PQ.SIZE;
return 0;
}
void CACHE::increment_WQ_FULL(uint64_t address)
{
WQ.FULL++;
}
void CACHE::llc_prefetcher_initialize(uint32_t cpu) {
llc_prefetcher_initialize_(cpu); /* delegate */
}
uint64_t CACHE::llc_prefetcher_operate(uint32_t cpu, uint64_t addr, uint64_t ip, uint8_t cache_hit, uint8_t type) {
if (type != LOAD) assert(0);
stats.llc_prefetcher_operate(cpu, addr, ip, cache_hit, type);
//cout<<"stats compelete"<<endl;
return llc_prefetcher_operate_(cpu, addr, ip, cache_hit, type); /* delegate */
}
void CACHE::llc_prefetcher_cache_fill(uint32_t cpu, uint64_t addr, uint32_t set, uint32_t way, uint8_t prefetch, uint64_t evicted_addr) {
stats.llc_prefetcher_cache_fill(cpu, addr, set, way, prefetch, evicted_addr);
llc_prefetcher_cache_fill_(cpu, addr, set, way, prefetch, evicted_addr); /* delegate */
}
void CACHE::llc_prefetcher_final_stats(uint32_t cpu) {
stats.llc_prefetcher_final_stats(cpu);
llc_prefetcher_final_stats_(cpu); /* delegate */
cout << endl;
}
void CACHE::llc_prefetcher_inform_warmup_complete() {
stats.llc_prefetcher_inform_warmup_complete();
llc_prefetcher_inform_warmup_complete_(); /* delegate */
}
void CACHE::llc_prefetcher_inform_roi_complete(uint32_t cpu) {
stats.llc_prefetcher_inform_roi_complete(cpu);
llc_prefetcher_inform_roi_complete_(cpu); /* delegate */
}
void CACHE::llc_prefetcher_roi_stats(uint32_t cpu) {
stats.llc_prefetcher_roi_stats(cpu);
llc_prefetcher_roi_stats_(cpu); /* delegate */
cout << endl;
}