[PATCH] fsx example
[fio.git] / time.c
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1#include <time.h>
2#include <sys/time.h>
3
4#include "fio.h"
5
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6static struct timeval genesis;
7
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8unsigned long utime_since(struct timeval *s, struct timeval *e)
9{
10 double sec, usec;
11
12 sec = e->tv_sec - s->tv_sec;
13 usec = e->tv_usec - s->tv_usec;
14 if (sec > 0 && usec < 0) {
15 sec--;
16 usec += 1000000;
17 }
18
19 sec *= (double) 1000000;
20
21 return sec + usec;
22}
23
24static unsigned long utime_since_now(struct timeval *s)
25{
26 struct timeval t;
27
28 gettimeofday(&t, NULL);
29 return utime_since(s, &t);
30}
31
32unsigned long mtime_since(struct timeval *s, struct timeval *e)
33{
34 double sec, usec;
35
36 sec = e->tv_sec - s->tv_sec;
37 usec = e->tv_usec - s->tv_usec;
38 if (sec > 0 && usec < 0) {
39 sec--;
40 usec += 1000000;
41 }
42
43 sec *= (double) 1000;
44 usec /= (double) 1000;
45
46 return sec + usec;
47}
48
49unsigned long mtime_since_now(struct timeval *s)
50{
51 struct timeval t;
52
53 gettimeofday(&t, NULL);
54 return mtime_since(s, &t);
55}
56
57unsigned long time_since_now(struct timeval *s)
58{
59 return mtime_since_now(s) / 1000;
60}
61
62/*
63 * busy looping version for the last few usec
64 */
b990b5c0 65void __usec_sleep(unsigned int usec)
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66{
67 struct timeval start;
68
69 gettimeofday(&start, NULL);
70 while (utime_since_now(&start) < usec)
71 nop;
72}
73
74void usec_sleep(struct thread_data *td, unsigned long usec)
75{
76 struct timespec req, rem;
77
78 req.tv_sec = usec / 1000000;
79 req.tv_nsec = usec * 1000 - req.tv_sec * 1000000;
80
81 do {
82 if (usec < 5000) {
83 __usec_sleep(usec);
84 break;
85 }
86
87 rem.tv_sec = rem.tv_nsec = 0;
88 if (nanosleep(&req, &rem) < 0)
89 break;
90
91 if ((rem.tv_sec + rem.tv_nsec) == 0)
92 break;
93
94 req.tv_nsec = rem.tv_nsec;
95 req.tv_sec = rem.tv_sec;
96
97 usec = rem.tv_sec * 1000000 + rem.tv_nsec / 1000;
98 } while (!td->terminate);
99}
100
101void rate_throttle(struct thread_data *td, unsigned long time_spent,
102 unsigned int bytes)
103{
104 unsigned long usec_cycle;
105
106 if (!td->rate)
107 return;
108
109 usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs);
110
111 if (time_spent < usec_cycle) {
112 unsigned long s = usec_cycle - time_spent;
113
114 td->rate_pending_usleep += s;
115 if (td->rate_pending_usleep >= 100000) {
116 usec_sleep(td, td->rate_pending_usleep);
117 td->rate_pending_usleep = 0;
118 }
119 } else {
120 long overtime = time_spent - usec_cycle;
121
122 td->rate_pending_usleep -= overtime;
123 }
124}
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125
126unsigned long mtime_since_genesis(void)
127{
128 return mtime_since_now(&genesis);
129}
130
131void time_init(void)
132{
133 gettimeofday(&genesis, NULL);
134}