tools/perf/util/stat.h

   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         u64 max, min;
  10 };
  11
  12 void update_stats(struct stats *stats, u64 val);
  13 double avg_stats(struct stats *stats);
  14 double stddev_stats(struct stats *stats);
  15 double rel_stddev_stats(double stddev, double avg);
  16
  17 static inline void init_stats(struct stats *stats)
  18 {
  19         stats->n    = 0.0;
  20         stats->mean = 0.0;
  21         stats->M2   = 0.0;
  22         stats->min  = (u64) -1;
  23         stats->max  = 0;
  24 }
  25 #endif