1 #ifndef __PERF_STATS_H 2 #define __PERF_STATS_H 3 4 #include "types.h" 5 6 struct stats 7 { 8 double n, mean, M2; 9 }; 10 11 void update_stats(struct stats *stats, u64 val); 12 double avg_stats(struct stats *stats); 13 double stddev_stats(struct stats *stats); 14 double rel_stddev_stats(double stddev, double avg); 15 16 #endif 17