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38 lines
832 B
38 lines
832 B
/* SPDX-License-Identifier: GPL-2.0 */
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/**
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* lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
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*
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*/
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#ifndef MINMAX_H
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#define MINMAX_H
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#include <linux/types.h>
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/* A single data point for our parameterized min-max tracker */
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struct minmax_sample {
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u32 t; /* time measurement was taken */
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u32 v; /* value measured */
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};
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/* State for the parameterized min-max tracker */
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struct minmax {
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struct minmax_sample s[3];
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};
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static inline u32 minmax_get(const struct minmax *m)
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{
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return m->s[0].v;
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}
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static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
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{
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struct minmax_sample val = { .t = t, .v = meas };
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m->s[2] = m->s[1] = m->s[0] = val;
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return m->s[0].v;
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}
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u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
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u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);
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#endif
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