+extern void stat_calc_dist(uint64_t *map, unsigned long total, double *io_u_dist);
+extern void reset_io_stats(struct thread_data *);
+extern void update_rusage_stat(struct thread_data *);
+extern void clear_rusage_stat(struct thread_data *);
+
+extern void add_lat_sample(struct thread_data *, enum fio_ddir, unsigned long long,
+ unsigned long long, uint64_t);
+extern void add_clat_sample(struct thread_data *, enum fio_ddir, unsigned long long,
+ unsigned long long, uint64_t);
+extern void add_slat_sample(struct thread_data *, enum fio_ddir, unsigned long,
+ unsigned long long, uint64_t);
+extern void add_agg_sample(union io_sample_data, enum fio_ddir, unsigned long long);
+extern void add_iops_sample(struct thread_data *, struct io_u *,
+ unsigned int);
+extern void add_bw_sample(struct thread_data *, struct io_u *,
+ unsigned int, unsigned long long);
+extern void add_sync_clat_sample(struct thread_stat *ts,
+ unsigned long long nsec);
+extern int calc_log_samples(void);