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/* -*- linux-c -*-
* Statistics Header
* Copyright (C) 2005 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _STAT_H_
#define _STAT_H_
#ifndef NEED_STAT_LOCKS
#define NEED_STAT_LOCKS 0
#endif
/* maximum buckets for a linear histogram */
#ifndef STP_MAX_BUCKETS
#define STP_MAX_BUCKETS 128
#endif
/* buckets for log histogram. */
#define HIST_LOG_BUCKETS 128
#define HIST_LOG_BUCKET0 64
/** histogram type */
enum histtype { HIST_NONE, HIST_LOG, HIST_LINEAR };
/** Statistics are stored in this struct. This is per-cpu or per-node data
and is variable length due to the unknown size of the histogram. */
struct stat_data {
int64_t count;
int64_t sum;
int64_t min, max;
#if NEED_STAT_LOCKS == 1
spinlock_t lock;
#endif
int64_t histogram[];
};
typedef struct stat_data stat;
/** Information about the histogram data collected. This data
is global and not duplicated per-cpu. */
struct _Hist {
enum histtype type;
int start;
int stop;
int interval;
int buckets;
};
typedef struct _Hist *Hist;
#endif /* _STAT_H_ */
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