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OBL.c
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OBL.c
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//
// an OBL module that supports sequential prefetching for block storage. Each
// object (logical block address) should be uniform in size.
//
//
// OBL.c
// libCacheSim
//
// Created by Zhelong on 24/1/29.
// Copyright © 2024 Zhelong. All rights reserved.
//
#include "../../include/libCacheSim/prefetchAlgo/OBL.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include "../../include/libCacheSim/prefetchAlgo.h"
// #define DEBUG
#ifdef __cplusplus
extern "C" {
#endif
// ***********************************************************************
// **** ****
// **** helper function declarations ****
// **** ****
// ***********************************************************************
const char *OBL_default_params(void) { return "block-size=512, sequential-confidence-k=4"; }
static void set_OBL_default_init_params(OBL_init_params_t *init_params) {
init_params->block_size = 512;
init_params->sequential_confidence_k = 4;
}
static void OBL_parse_init_params(const char *cache_specific_params, OBL_init_params_t *init_params) {
char *params_str = strdup(cache_specific_params);
while (params_str != NULL && params_str[0] != '\0') {
char *key = strsep((char **)¶ms_str, "=");
char *value = strsep((char **)¶ms_str, ",");
while (params_str != NULL && *params_str == ' ') {
params_str++;
}
if (strcasecmp(key, "block-size") == 0) {
init_params->block_size = atoi(value);
} else if (strcasecmp(key, "sequential-confidence-k") == 0) {
init_params->sequential_confidence_k = atoi(value);
} else {
ERROR("OBL does not have parameter %s\n", key);
printf("default params: %s\n", OBL_default_params());
exit(1);
}
}
}
static void set_OBL_params(OBL_params_t *OBL_params, OBL_init_params_t *init_params, uint64_t cache_size) {
OBL_params->block_size = init_params->block_size;
OBL_params->sequential_confidence_k = init_params->sequential_confidence_k;
OBL_params->do_prefetch = false;
if (OBL_params->sequential_confidence_k <= 0) {
printf("sequential_confidence_k should be positive\n");
exit(1);
}
OBL_params->prev_access_block = (obj_id_t *)malloc(OBL_params->sequential_confidence_k * sizeof(obj_id_t));
for (int i = 0; i < OBL_params->sequential_confidence_k; i++) {
OBL_params->prev_access_block[i] = UINT64_MAX;
}
OBL_params->curr_idx = 0;
}
/**************************************************************************
** prefetcher interfaces
**
** create, free, clone, handle_find, handle_insert, handle_evict, prefetch
**************************************************************************/
prefetcher_t *create_OBL_prefetcher(const char *init_params, uint64_t cache_size);
/**
check if the previous access is sequential. If true, set do_prefetch to true.
@param cache the cache struct
@param req the request containing the request
@return
*/
static void OBL_handle_find(cache_t *cache, const request_t *req, bool hit) {
OBL_params_t *OBL_params = (OBL_params_t *)(cache->prefetcher->params);
int32_t sequential_confidence_k = OBL_params->sequential_confidence_k;
// assert(req->obj_size == OBL_params->block_size);
bool flag = true;
for (int i = 0; i < sequential_confidence_k; i++) {
if (OBL_params->prev_access_block[(OBL_params->curr_idx + 1 + i) % sequential_confidence_k] !=
req->obj_id - sequential_confidence_k + i) {
flag = false;
break;
}
}
OBL_params->do_prefetch = flag;
OBL_params->curr_idx = (OBL_params->curr_idx + 1) % sequential_confidence_k;
OBL_params->prev_access_block[OBL_params->curr_idx] = req->obj_id;
}
/**
prefetch next block if the previous access is sequential
@param cache the cache struct
@param req the request containing the request
@return
*/
void OBL_prefetch(cache_t *cache, const request_t *req) {
OBL_params_t *OBL_params = (OBL_params_t *)(cache->prefetcher->params);
if (OBL_params->do_prefetch) {
OBL_params->do_prefetch = false;
request_t *new_req = new_request();
new_req->obj_size = OBL_params->block_size;
new_req->obj_id = req->obj_id + 1;
if (cache->find(cache, new_req, false)) {
free_request(new_req);
return;
}
while (cache->get_occupied_byte(cache) + OBL_params->block_size > cache->cache_size) {
cache->evict(cache, req);
}
cache->insert(cache, new_req);
free_request(new_req);
}
}
void free_OBL_prefetcher(prefetcher_t *prefetcher) {
OBL_params_t *OBL_params = (OBL_params_t *)prefetcher->params;
free(OBL_params->prev_access_block);
my_free(sizeof(OBL_params_t), OBL_params);
if (prefetcher->init_params) {
free(prefetcher->init_params);
}
my_free(sizeof(prefetcher_t), prefetcher);
}
prefetcher_t *clone_OBL_prefetcher(prefetcher_t *prefetcher, uint64_t cache_size) {
return create_OBL_prefetcher(prefetcher->init_params, cache_size);
}
prefetcher_t *create_OBL_prefetcher(const char *init_params, uint64_t cache_size) {
OBL_init_params_t *OBL_init_params = my_malloc(OBL_init_params_t);
memset(OBL_init_params, 0, sizeof(OBL_init_params_t));
set_OBL_default_init_params(OBL_init_params);
if (init_params != NULL) {
OBL_parse_init_params(init_params, OBL_init_params);
}
OBL_params_t *OBL_params = my_malloc(OBL_params_t);
set_OBL_params(OBL_params, OBL_init_params, cache_size);
prefetcher_t *prefetcher = (prefetcher_t *)my_malloc(prefetcher_t);
memset(prefetcher, 0, sizeof(prefetcher_t));
prefetcher->params = OBL_params;
prefetcher->prefetch = OBL_prefetch;
prefetcher->handle_find = OBL_handle_find;
prefetcher->handle_insert = NULL;
prefetcher->handle_evict = NULL;
prefetcher->free = free_OBL_prefetcher;
prefetcher->clone = clone_OBL_prefetcher;
if (init_params) {
prefetcher->init_params = strdup(init_params);
}
my_free(sizeof(OBL_init_params_t), OBL_init_params);
return prefetcher;
}