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