[mirror_ubuntu-artful-kernel.git] / include / linux / win_minmax.h

/**
 * lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
 *
 */
#ifndef MINMAX_H
#define MINMAX_H

#include <linux/types.h>

/* A single data point for our parameterized min-max tracker */
struct minmax_sample {
	u32	t;	/* time measurement was taken */
	u32	v;	/* value measured */
};

/* State for the parameterized min-max tracker */
struct minmax {
	struct minmax_sample s[3];
};

static inline u32 minmax_get(const struct minmax *m)
{
	return m->s[0].v;
}

static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
{
	struct minmax_sample val = { .t = t, .v = meas };

	m->s[2] = m->s[1] = m->s[0] = val;
	return m->s[0].v;
}

u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);

#endif
Commit	Line	Data
a4f1f9ac NC	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