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author | root <root@artemis.panaceas.org> | 2015-12-25 15:00:15 +0000 |
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committer | root <root@artemis.panaceas.org> | 2015-12-25 15:00:15 +0000 |
commit | ddd86436f4e3643c04b797f858dab95d5f2e4de9 (patch) | |
tree | bfe7a780cf9a2f4fc33aec32c82e625e79dece1f /include/linux/backport-average.h | |
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Diffstat (limited to 'include/linux/backport-average.h')
-rw-r--r-- | include/linux/backport-average.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/backport-average.h b/include/linux/backport-average.h new file mode 100644 index 0000000..c6028fd --- /dev/null +++ b/include/linux/backport-average.h @@ -0,0 +1,30 @@ +#ifndef _LINUX_AVERAGE_H +#define _LINUX_AVERAGE_H + +/* Exponentially weighted moving average (EWMA) */ + +/* For more documentation see lib/average.c */ + +struct ewma { + unsigned long internal; + unsigned long factor; + unsigned long weight; +}; + +extern void ewma_init(struct ewma *avg, unsigned long factor, + unsigned long weight); + +extern struct ewma *ewma_add(struct ewma *avg, unsigned long val); + +/** + * ewma_read() - Get average value + * @avg: Average structure + * + * Returns the average value held in @avg. + */ +static inline unsigned long ewma_read(const struct ewma *avg) +{ + return avg->internal >> avg->factor; +} + +#endif /* _LINUX_AVERAGE_H */ |