include/linux/win_minmax.h

   1 /**
   2  * lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
   3  *
   4  */
   5 #ifndef MINMAX_H
   6 #define MINMAX_H
   7
   8 #include <linux/types.h>
   9
  10 /* A single data point for our parameterized min-max tracker */
  11 struct minmax_sample {
  12         u32     t;      /* time measurement was taken */
  13         u32     v;      /* value measured */
  14 };
  15
  16 /* State for the parameterized min-max tracker */
  17 struct minmax {
  18         struct minmax_sample s[3];
  19 };
  20
  21 static inline u32 minmax_get(const struct minmax *m)
  22 {
  23         return m->s[0].v;
  24 }
  25
  26 static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
  27 {
  28         struct minmax_sample val = { .t = t, .v = meas };
  29
  30         m->s[2] = m->s[1] = m->s[0] = val;
  31         return m->s[0].v;
  32 }
  33
  34 u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
  35 u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);
  36
  37 #endif