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/* -*- linux-c -*-
* map functions to handle statistics
* 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.
*/
/** @file map-stat.c
* @brief Map functions to set and get stats
*/
#include "stat-common.c"
/* Adds an int64 to a stats map */
static int _stp_map_add_stat (MAP map, int64_t val)
{
stat *d;
Stat st;
if (map == NULL)
return -2;
if (map->create) {
struct map_node *m = __stp_map_create (map);
if (!m)
return -1;
/* set the value */
d = (stat *)((long)m + map->data_offset);
d->count = 0;
} else {
if (map->key == NULL)
return -2;
d = (stat *)((long)map->key + map->data_offset);
}
st = (Stat)((long)map + offsetof(struct map_root, hist_type));
__stp_stat_add (st, d, val);
return 0;
}
static void _stp_map_print_histogram (MAP map, stat *sd)
{
Stat st = (Stat)((long)map + offsetof(struct map_root, hist_type));
_stp_stat_print_histogram (st, sd);
}
static MAP _stp_map_new_hstat_log (unsigned max_entries, int key_size, int buckets)
{
/* add size for buckets */
int size = buckets * sizeof(int64_t) + sizeof(stat);
MAP m = _stp_map_new (max_entries, STAT, key_size, size);
if (m) {
m->hist_type = HIST_LOG;
m->hist_buckets = buckets;
if (buckets < 1 || buckets > 64) {
_stp_warn("histogram: Bad number of buckets. Must be between 1 and 64\n");
m->hist_type = HIST_NONE;
return m;
}
}
return m;
}
static MAP _stp_map_new_hstat_linear (unsigned max_entries, int ksize, int start, int stop, int interval)
{
MAP m;
int size;
int buckets = (stop - start) / interval;
if ((stop - start) % interval) buckets++;
/* add size for buckets */
size = buckets * sizeof(int64_t) + sizeof(stat);
m = _stp_map_new (max_entries, STAT, ksize, size);
if (m) {
m->hist_type = HIST_LINEAR;
m->hist_start = start;
m->hist_stop = stop;
m->hist_int = interval;
m->hist_buckets = buckets;
if (m->hist_buckets <= 0) {
_stp_warn("histogram: bad stop, start and/or interval\n");
m->hist_type = HIST_NONE;
return m;
}
}
return m;
}
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