+extern unsigned int calc_clat_percentiles(unsigned int *io_u_plat, unsigned long nr, fio_fp64_t *plist, unsigned int **output, unsigned int *maxv, unsigned int *minv);
+extern void stat_calc_lat_m(struct thread_stat *ts, double *io_u_lat);
+extern void stat_calc_lat_u(struct thread_stat *ts, double *io_u_lat);
+extern void stat_calc_dist(unsigned int *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,
+ unsigned int, uint64_t);
+extern void add_clat_sample(struct thread_data *, enum fio_ddir, unsigned long,
+ unsigned int, uint64_t);
+extern void add_slat_sample(struct thread_data *, enum fio_ddir, unsigned long,
+ unsigned int, uint64_t);
+extern void add_bw_sample(struct thread_data *, enum fio_ddir, unsigned int,
+ struct timeval *);
+extern void add_iops_sample(struct thread_data *, enum fio_ddir, unsigned int,
+ struct timeval *);
+extern void add_agg_sample(unsigned long, enum fio_ddir, unsigned int);
+
+extern struct io_log *agg_io_log[DDIR_RWDIR_CNT];
+extern int write_bw_log;