Fio 2.1.3
[fio.git] / time.c
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1#include <time.h>
2#include <sys/time.h>
3
4#include "fio.h"
5
263e529f 6static struct timeval genesis;
fd841467 7static unsigned long ns_granularity;
263e529f 8
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9/*
10 * busy looping version for the last few usec
11 */
6dd6f2cd 12void usec_spin(unsigned int usec)
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13{
14 struct timeval start;
15
02bcaa8c 16 fio_gettime(&start, NULL);
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17 while (utime_since_now(&start) < usec)
18 nop;
19}
20
21void usec_sleep(struct thread_data *td, unsigned long usec)
22{
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23 struct timespec req;
24 struct timeval tv;
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25
26 do {
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27 unsigned long ts = usec;
28
29 if (usec < ns_granularity) {
6dd6f2cd 30 usec_spin(usec);
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31 break;
32 }
33
fd841467 34 ts = usec - ns_granularity;
3c39a379 35
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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)
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46 break;
47
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48 ts = utime_since_now(&tv);
49 if (ts >= usec)
50 break;
3c39a379 51
fd841467 52 usec -= ts;
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53 } while (!td->terminate);
54}
55
aa60bc58 56uint64_t mtime_since_genesis(void)
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57{
58 return mtime_since_now(&genesis);
59}
60
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61int in_ramp_time(struct thread_data *td)
62{
63 return td->o.ramp_time && !td->ramp_time_over;
64}
65
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66int ramp_time_over(struct thread_data *td)
67{
68 struct timeval tv;
69
70 if (!td->o.ramp_time || td->ramp_time_over)
71 return 1;
72
73 fio_gettime(&tv, NULL);
74 if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
75 td->ramp_time_over = 1;
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76 reset_all_stats(td);
77 td_set_runstate(td, TD_RAMP);
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78 return 1;
79 }
80
81 return 0;
82}
83
03e20d68 84void fio_time_init(void)
263e529f 85{
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86 int i;
87
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88 fio_clock_init();
89
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90 /*
91 * Check the granularity of the nanosleep function
92 */
93 for (i = 0; i < 10; i++) {
94 struct timeval tv;
95 struct timespec ts;
96 unsigned long elapsed;
97
98 fio_gettime(&tv, NULL);
99 ts.tv_sec = 0;
100 ts.tv_nsec = 1000;
101
102 nanosleep(&ts, NULL);
103 elapsed = utime_since_now(&tv);
104
105 if (elapsed > ns_granularity)
106 ns_granularity = elapsed;
107 }
263e529f 108}
6043c579 109
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110void set_genesis_time(void)
111{
112 fio_gettime(&genesis, NULL);
113}
114
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115void fill_start_time(struct timeval *t)
116{
117 memcpy(t, &genesis, sizeof(genesis));
118}