fix: Mithril handle_find is only called when occuring real user requests

Author: zztaki

libCacheSim/cache/cache.c

@@ -153,7 +153,9 @@ cache_obj_t *cache_find_base(cache_t *cache, const request_t *req,
                              const bool update_cache) {
   cache_obj_t *cache_obj = hashtable_find(cache->hashtable, req);
 
-  if (cache->prefetcher && cache->prefetcher->handle_find) {
+  // "update_cache = true" means that it is a real user request, use handle_find
+  // to update prefetcher's state
+  if (cache->prefetcher && cache->prefetcher->handle_find && update_cache) {
     bool hit = (cache_obj != NULL);
     cache->prefetcher->handle_find(cache, req, hit);
   }

libCacheSim/cache/prefetch/Mithril.c

@@ -358,7 +358,6 @@ void Mithril_prefetch(cache_t *cache, const request_t *req) {
         Mithril_params->num_of_check += 1;
       }
 
-      // can't use Mithril_find here
       if (cache->find(cache, new_req, false)) {
         continue;
       }
@@ -387,7 +386,7 @@ void Mithril_prefetch(cache_t *cache, const request_t *req) {
     new_req->obj_id = req->obj_id + 1;
     new_req->obj_size = req->obj_size;  // same size
 
-    if (cache->find(cache, new_req, true)) {
+    if (cache->find(cache, new_req, false)) {
       my_free(sizeof(request_t), new_req);
       return;
     }

test/test_prefetchAlgo.c

@@ -45,9 +45,9 @@ static void print_results(const cache_t *cache, const cache_stat_t *res) {
 }
 
 static void test_Mithril(gconstpointer user_data) {
-  uint64_t miss_cnt_true[] = {79999, 78490, 76128, 75257,
+  uint64_t miss_cnt_true[] = {79796, 78480, 76126, 75256,
                               72336, 72062, 71936, 71667};
-  uint64_t miss_byte_true[] = {3483394560, 3398693888, 3285270016, 3245235712,
+  uint64_t miss_byte_true[] = {3471357440, 3399726080, 3285093888, 3245231616,
                                3092759040, 3077801472, 3075234816, 3061489664};
 
   reader_t *reader = (reader_t *)user_data;