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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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David Ahern
ffe4f3c0d1
Need an initialization function to set min to -1 to differentiate from an actual min of 0. Signed-off-by: David Ahern <[email protected]> Reviewed-by: Xiao Guangrong <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Runzhen Wang <[email protected]> Cc: Xiao Guangrong <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
26 lines
470 B
C
26 lines
470 B
C
#ifndef __PERF_STATS_H
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#define __PERF_STATS_H
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#include "types.h"
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struct stats
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{
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double n, mean, M2;
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u64 max, min;
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};
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void update_stats(struct stats *stats, u64 val);
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double avg_stats(struct stats *stats);
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double stddev_stats(struct stats *stats);
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double rel_stddev_stats(double stddev, double avg);
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static inline void init_stats(struct stats *stats)
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{
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stats->n = 0.0;
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stats->mean = 0.0;
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stats->M2 = 0.0;
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stats->min = (u64) -1;
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stats->max = 0;
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}
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#endif
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