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/*
* FCP adapter trace utility
*
* Various shared utility functions and structs
*
* Copyright IBM Corp. 2008, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef ZIOMON_TOOLS_H
#define ZIOMON_TOOLS_H
#include <byteswap.h>
#include <endian.h>
#include <linux/types.h>
#define swap_64(num) (num = be64toh(num))
#define swap_32(num) (num = be32toh(num))
#define swap_16(num) (num = be16toh(num))
#define verbose_msg(x...) do {\
if (verbose)\
printf("\t=== " x);\
} while (0)
#ifdef NDEBUG
#define vverbose_msg(x...)
#else
#define vverbose_msg(x...) do {\
if (verbose >= 2)\
printf("\t=== " x);\
} while (0)
#endif
/**
* abbreviated stat (without a count).
* Used in various places where multiple instances of stats have
* to be collected, sharing a single count variable to save some space */
struct abbrev_stat {
__u64 min;
__u64 max;
__u64 sum;
__u64 sos; /* sum of squares */
} __attribute__ ((packed));
void swap_abbrev_stat(struct abbrev_stat *var);
void print_abbrev_stat(struct abbrev_stat *stats, __u64 count);
void aggregate_abbrev_stat(const struct abbrev_stat *src,
struct abbrev_stat *tgt);
void update_abbrev_stat(struct abbrev_stat *stat, __u64 val);
void copy_abbrev_stat(struct abbrev_stat *tgt,
const struct abbrev_stat *src);
/**
* Rebase abbrev_stat structure from 'old_count' to 'new_count' number of
* sample. Since we assume that the additional samples are all 0, we also
* fix the respective 'min' value while at it. */
void transform_abbrev_stat(struct abbrev_stat *stat, __u64 old_count,
double new_count);
void init_abbrev_stat(struct abbrev_stat *data);
double calc_avg(__u64 sum, __u64 count);
double calc_variance(__u64 sum, __u64 sos, __u64 count);
double calc_std_dev(__u64 sum, __u64 sos, __u64 count);
#endif
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