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 38