Remove comment wrt sigaction() usage, it's deprecated
[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;
13
14 #ifdef FIO_DEBUG_TIME
15
16 #define HASH_BITS       8
17 #define HASH_SIZE       (1 << HASH_BITS)
18
19 static struct flist_head hash[HASH_SIZE];
20 static int gtod_inited;
21
22 struct gtod_log {
23         struct flist_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 flist_head *entry;
32
33         flist_for_each(entry, &hash[h]) {
34                 struct gtod_log *log = flist_entry(entry, struct gtod_log,
35                                                                         list);
36
37                 if (log->caller == caller)
38                         return log;
39         }
40
41         return NULL;
42 }
43
44 static struct gtod_log *find_log(void *caller)
45 {
46         struct gtod_log *log = find_hash(caller);
47
48         if (!log) {
49                 unsigned long h;
50
51                 log = malloc(sizeof(*log));
52                 INIT_FLIST_HEAD(&log->list);
53                 log->caller = caller;
54                 log->calls = 0;
55
56                 h = hash_ptr(caller, HASH_BITS);
57                 flist_add_tail(&log->list, &hash[h]);
58         }
59
60         return log;
61 }
62
63 static void gtod_log_caller(void *caller)
64 {
65         if (gtod_inited) {
66                 struct gtod_log *log = find_log(caller);
67
68                 log->calls++;
69         }
70 }
71
72 static void fio_exit fio_dump_gtod(void)
73 {
74         unsigned long total_calls = 0;
75         int i;
76
77         for (i = 0; i < HASH_SIZE; i++) {
78                 struct flist_head *entry;
79                 struct gtod_log *log;
80
81                 flist_for_each(entry, &hash[i]) {
82                         log = flist_entry(entry, struct gtod_log, list);
83
84                         printf("function %p, calls %lu\n", log->caller,
85                                                                 log->calls);
86                         total_calls += log->calls;
87                 }
88         }
89
90         printf("Total %lu gettimeofday\n", total_calls);
91 }
92
93 static void fio_init gtod_init(void)
94 {
95         int i;
96
97         for (i = 0; i < HASH_SIZE; i++)
98                 INIT_FLIST_HEAD(&hash[i]);
99
100         gtod_inited = 1;
101 }
102
103 #endif /* FIO_DEBUG_TIME */
104
105 #ifdef FIO_DEBUG_TIME
106 void fio_gettime(struct timeval *tp, void *caller)
107 #else
108 void fio_gettime(struct timeval *tp, void fio_unused *caller)
109 #endif
110 {
111 #ifdef FIO_DEBUG_TIME
112         if (!caller)
113                 caller = __builtin_return_address(0);
114
115         gtod_log_caller(caller);
116 #endif
117         if (!clock_gettime_works) {
118 gtod:
119                 gettimeofday(tp, NULL);
120         } else {
121                 struct timespec ts;
122
123                 if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
124                         clock_gettime_works = 0;
125                         goto gtod;
126                 }
127
128                 tp->tv_sec = ts.tv_sec;
129                 tp->tv_usec = ts.tv_nsec / 1000;
130         }
131 }