static void displace(block_info_t *bi, workset_t *new_vals, int is_usage) {
belady_env_t *env = bi->bel;
workset_t *ws = env->ws;
static void displace(block_info_t *bi, workset_t *new_vals, int is_usage) {
belady_env_t *env = bi->bel;
workset_t *ws = env->ws;