1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* Clock functions
*/
#include <unistd.h>
#include <sys/time.h>
#include "fio.h"
#include "hash.h"
static int clock_gettime_works = 0;
#ifdef FIO_DEBUG_TIME
#define HASH_BITS 8
#define HASH_SIZE (1 << HASH_BITS)
static struct list_head hash[HASH_SIZE];
static int gtod_inited;
struct gtod_log {
struct list_head list;
void *caller;
unsigned long calls;
};
static struct gtod_log *find_hash(void *caller)
{
unsigned long h = hash_ptr(caller, HASH_BITS);
struct list_head *entry;
list_for_each(entry, &hash[h]) {
struct gtod_log *log = list_entry(entry, struct gtod_log, list);
if (log->caller == caller)
return log;
}
return NULL;
}
static struct gtod_log *find_log(void *caller)
{
struct gtod_log *log = find_hash(caller);
if (!log) {
unsigned long h;
log = malloc(sizeof(*log));
INIT_LIST_HEAD(&log->list);
log->caller = caller;
log->calls = 0;
h = hash_ptr(caller, HASH_BITS);
list_add_tail(&log->list, &hash[h]);
}
return log;
}
static void gtod_log_caller(void *caller)
{
if (gtod_inited) {
struct gtod_log *log = find_log(caller);
log->calls++;
}
}
static void fio_exit fio_dump_gtod(void)
{
unsigned long total_calls = 0;
int i;
for (i = 0; i < HASH_SIZE; i++) {
struct list_head *entry;
struct gtod_log *log;
list_for_each(entry, &hash[i]) {
log = list_entry(entry, struct gtod_log, list);
printf("function %p, calls %lu\n", log->caller, log->calls);
total_calls += log->calls;
}
}
printf("Total %lu gettimeofday\n", total_calls);
}
static void fio_init gtod_init(void)
{
int i;
for (i = 0; i < HASH_SIZE; i++)
INIT_LIST_HEAD(&hash[i]);
gtod_inited = 1;
}
#endif /* FIO_DEBUG_TIME */
#ifdef FIO_DEBUG_TIME
void fio_gettime(struct timeval *tp, void *caller)
#else
void fio_gettime(struct timeval *tp, void fio_unused *caller)
#endif
{
#ifdef FIO_DEBUG_TIME
if (!caller)
caller = __builtin_return_address(0);
gtod_log_caller(caller);
#endif
if (!clock_gettime_works) {
gtod:
gettimeofday(tp, NULL);
} else {
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
clock_gettime_works = 0;
goto gtod;
}
tp->tv_sec = ts.tv_sec;
tp->tv_usec = ts.tv_nsec / 1000;
}
}
|
