int64_t cache_resize(PageCache *cache, int64_t new_num_pages) { PageCache *new_cache; int64_t i; CacheItem *old_it, *new_it; g_assert(cache); /* cache was not inited */ if (cache->page_cache == NULL) { return -1; } /* same size */ if (pow2floor(new_num_pages) == cache->max_num_items) { return cache->max_num_items; } new_cache = cache_init(new_num_pages, cache->page_size); if (!(new_cache)) { DPRINTF("Error creating new cache\n"); return -1; } /* move all data from old cache */ for (i = 0; i < cache->max_num_items; i++) { old_it = &cache->page_cache[i]; if (old_it->it_addr != -1) { /* check for collision, if there is, keep MRU page */ new_it = cache_get_by_addr(new_cache, old_it->it_addr); if (new_it->it_data) { /* keep the MRU page */ if (new_it->it_age >= old_it->it_age) { g_free(old_it->it_data); } else { g_free(new_it->it_data); new_it->it_data = old_it->it_data; new_it->it_age = old_it->it_age; new_it->it_addr = old_it->it_addr; } } else { cache_insert(new_cache, old_it->it_addr, old_it->it_data); } } } cache->page_cache = new_cache->page_cache; cache->max_num_items = new_cache->max_num_items; cache->num_items = new_cache->num_items; g_free(new_cache); return cache->max_num_items; }