1 #include <time.h>
2 #include <sys/time.h>
3
4 #include "fio.h"
5
6 static struct timeval genesis;
7 static unsigned long ns_granularity;
8
9 /*
10 * busy looping version for the last few usec
11 */
usec_spin(unsigned int usec)12 uint64_t usec_spin(unsigned int usec)
13 {
14 struct timeval start;
15 uint64_t t;
16
17 fio_gettime(&start, NULL);
18 while ((t = utime_since_now(&start)) < usec)
19 nop;
20
21 return t;
22 }
23
usec_sleep(struct thread_data * td,unsigned long usec)24 uint64_t usec_sleep(struct thread_data *td, unsigned long usec)
25 {
26 struct timespec req;
27 struct timeval tv;
28 uint64_t t = 0;
29
30 do {
31 unsigned long ts = usec;
32
33 if (usec < ns_granularity) {
34 t += usec_spin(usec);
35 break;
36 }
37
38 ts = usec - ns_granularity;
39
40 if (ts >= 1000000) {
41 req.tv_sec = ts / 1000000;
42 ts -= 1000000 * req.tv_sec;
43 } else
44 req.tv_sec = 0;
45
46 req.tv_nsec = ts * 1000;
47 fio_gettime(&tv, NULL);
48
49 if (nanosleep(&req, NULL) < 0)
50 break;
51
52 ts = utime_since_now(&tv);
53 t += ts;
54 if (ts >= usec)
55 break;
56
57 usec -= ts;
58 } while (!td->terminate);
59
60 return t;
61 }
62
time_since_genesis(void)63 uint64_t time_since_genesis(void)
64 {
65 return time_since_now(&genesis);
66 }
67
mtime_since_genesis(void)68 uint64_t mtime_since_genesis(void)
69 {
70 return mtime_since_now(&genesis);
71 }
72
utime_since_genesis(void)73 uint64_t utime_since_genesis(void)
74 {
75 return utime_since_now(&genesis);
76 }
77
in_ramp_time(struct thread_data * td)78 int in_ramp_time(struct thread_data *td)
79 {
80 return td->o.ramp_time && !td->ramp_time_over;
81 }
82
ramp_time_over(struct thread_data * td)83 int ramp_time_over(struct thread_data *td)
84 {
85 struct timeval tv;
86
87 if (!td->o.ramp_time || td->ramp_time_over)
88 return 1;
89
90 fio_gettime(&tv, NULL);
91 if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
92 td->ramp_time_over = 1;
93 reset_all_stats(td);
94 td_set_runstate(td, TD_RAMP);
95 return 1;
96 }
97
98 return 0;
99 }
100
fio_time_init(void)101 void fio_time_init(void)
102 {
103 int i;
104
105 fio_clock_init();
106
107 /*
108 * Check the granularity of the nanosleep function
109 */
110 for (i = 0; i < 10; i++) {
111 struct timeval tv;
112 struct timespec ts;
113 unsigned long elapsed;
114
115 fio_gettime(&tv, NULL);
116 ts.tv_sec = 0;
117 ts.tv_nsec = 1000;
118
119 nanosleep(&ts, NULL);
120 elapsed = utime_since_now(&tv);
121
122 if (elapsed > ns_granularity)
123 ns_granularity = elapsed;
124 }
125 }
126
set_genesis_time(void)127 void set_genesis_time(void)
128 {
129 fio_gettime(&genesis, NULL);
130 }
131
fill_start_time(struct timeval * t)132 void fill_start_time(struct timeval *t)
133 {
134 memcpy(t, &genesis, sizeof(genesis));
135 }
136