extern void add_iops_sample(struct thread_data *, enum fio_ddir, unsigned int,
struct timeval *);
extern void init_disk_util(struct thread_data *);
-extern void update_rusage_stat(struct thread_data *);
extern void setup_log(struct io_log **, struct log_params *, const char *);
extern void flush_log(struct io_log *, int);
extern void free_log(struct io_log *);