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