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/*
* FCP adapter trace facility
*
* Various shared utility functions and structs
*
* Copyright IBM Corp. 2008
* Author(s): Stefan Raspl <raspl@linux.vnet.ibm.com>
*/
#include <stdio.h>
#include <stdint.h>
#include <assert.h>
#include <math.h>
#include "ziomon_tools.h"
extern int verbose;
void swap_abbrev_stat(struct abbrev_stat *var) {
swap_64(var->min);
swap_64(var->max);
swap_64(var->sum);
swap_64(var->sos);
}
double calc_avg(__u64 sum, __u64 count)
{
assert(count > 0);
return (sum / (double)count);
}
double calc_variance(__u64 sum, __u64 sos, __u64 count)
{
assert(count > 0);
return ((sos - ((sum * sum) / (double)count)) / (double)count);
}
double calc_std_dev(__u64 sum, __u64 sos, __u64 count)
{
return sqrt(calc_variance(sum, sos, count));
}
void transform_abbrev_stat(struct abbrev_stat *stat,
__u64 old_count,
double new_count)
{
stat->min = 0;
stat->sum = (__u64)(calc_avg(stat->sum, old_count) * new_count);
stat->sos = (__u64)(calc_avg(stat->sos, old_count) * new_count);
}
void print_abbrev_stat(struct abbrev_stat *stats, __u64 count)
{
printf("\t\tmin : %Lu\n", (long long)stats->min);
printf("\t\tmax : %Lu\n", (long long)stats->max);
vverbose_msg("\t\tsum : %Lu\n", (long long)stats->sum);
vverbose_msg("\t\tsos : %Lu\n", (long long)stats->sos);
printf("\t\tavg : %.1lf\n", calc_avg(stats->sum, count));
printf("\t\tstd dev : %.1lf\n", calc_std_dev(stats->sum, stats->sos,
count));
}
void aggregate_abbrev_stat(const struct abbrev_stat *src,
struct abbrev_stat *tgt)
{
if (src->max > tgt->max)
tgt->max = src->max;
if (src->min < tgt->min)
tgt->min = src->min;
tgt->sum += src->sum;
tgt->sos += src->sos;
}
void update_abbrev_stat(struct abbrev_stat *stat, __u64 val)
{
if (val < stat->min)
stat->min = val;
if (val > stat->max)
stat->max = val;
stat->sum += val;
stat->sos += (val * val);
}
void copy_abbrev_stat(struct abbrev_stat *tgt,
const struct abbrev_stat *src)
{
tgt->min = src->min;
tgt->max = src->max;
tgt->sum = src->sum;
tgt->sos = src->sos;
}
void init_abbrev_stat(struct abbrev_stat *data)
{
data->min = UINT64_MAX;
data->max = 0;
data->sum = 0;
data->sos = 0;
}
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