[PATCH] Make fio_assert() core dump the job
[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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9unsigned long utime_since(struct timeval *s, struct timeval *e)
10{
1e97cce9 11 long sec, usec;
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12
13 sec = e->tv_sec - s->tv_sec;
14 usec = e->tv_usec - s->tv_usec;
15 if (sec > 0 && usec < 0) {
16 sec--;
17 usec += 1000000;
18 }
19
20 sec *= (double) 1000000;
21
22 return sec + usec;
23}
24
69008999 25unsigned long utime_since_now(struct timeval *s)
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26{
27 struct timeval t;
28
02bcaa8c 29 fio_gettime(&t, NULL);
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30 return utime_since(s, &t);
31}
32
33unsigned long mtime_since(struct timeval *s, struct timeval *e)
34{
1e97cce9 35 long sec, usec;
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36
37 sec = e->tv_sec - s->tv_sec;
38 usec = e->tv_usec - s->tv_usec;
39 if (sec > 0 && usec < 0) {
40 sec--;
41 usec += 1000000;
42 }
43
44 sec *= (double) 1000;
45 usec /= (double) 1000;
46
47 return sec + usec;
48}
49
50unsigned long mtime_since_now(struct timeval *s)
51{
52 struct timeval t;
02bcaa8c 53 void *p = __builtin_return_address(0);
3c39a379 54
02bcaa8c 55 fio_gettime(&t, p);
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56 return mtime_since(s, &t);
57}
58
59unsigned long time_since_now(struct timeval *s)
60{
61 return mtime_since_now(s) / 1000;
62}
63
64/*
65 * busy looping version for the last few usec
66 */
b990b5c0 67void __usec_sleep(unsigned int usec)
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68{
69 struct timeval start;
70
02bcaa8c 71 fio_gettime(&start, NULL);
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72 while (utime_since_now(&start) < usec)
73 nop;
74}
75
76void usec_sleep(struct thread_data *td, unsigned long usec)
77{
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78 struct timespec req;
79 struct timeval tv;
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80
81 do {
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82 unsigned long ts = usec;
83
84 if (usec < ns_granularity) {
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85 __usec_sleep(usec);
86 break;
87 }
88
fd841467 89 ts = usec - ns_granularity;
3c39a379 90
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91 if (ts >= 1000000) {
92 req.tv_sec = ts / 1000000;
93 ts -= 1000000 * req.tv_sec;
94 } else
95 req.tv_sec = 0;
96
97 req.tv_nsec = ts * 1000;
98 fio_gettime(&tv, NULL);
99
100 if (nanosleep(&req, NULL) < 0)
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101 break;
102
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103 ts = utime_since_now(&tv);
104 if (ts >= usec)
105 break;
3c39a379 106
fd841467 107 usec -= ts;
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108 } while (!td->terminate);
109}
110
111void rate_throttle(struct thread_data *td, unsigned long time_spent,
a00735e6 112 unsigned int bytes, int ddir)
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113{
114 unsigned long usec_cycle;
115
116 if (!td->rate)
117 return;
118
a00735e6 119 usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs[ddir]);
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120
121 if (time_spent < usec_cycle) {
122 unsigned long s = usec_cycle - time_spent;
123
124 td->rate_pending_usleep += s;
125 if (td->rate_pending_usleep >= 100000) {
126 usec_sleep(td, td->rate_pending_usleep);
127 td->rate_pending_usleep = 0;
128 }
129 } else {
130 long overtime = time_spent - usec_cycle;
131
132 td->rate_pending_usleep -= overtime;
133 }
134}
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135
136unsigned long mtime_since_genesis(void)
137{
138 return mtime_since_now(&genesis);
139}
140
02bcaa8c 141static void fio_init time_init(void)
263e529f 142{
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143 int i;
144
02bcaa8c 145 fio_gettime(&genesis, NULL);
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146
147 /*
148 * Check the granularity of the nanosleep function
149 */
150 for (i = 0; i < 10; i++) {
151 struct timeval tv;
152 struct timespec ts;
153 unsigned long elapsed;
154
155 fio_gettime(&tv, NULL);
156 ts.tv_sec = 0;
157 ts.tv_nsec = 1000;
158
159 nanosleep(&ts, NULL);
160 elapsed = utime_since_now(&tv);
161
162 if (elapsed > ns_granularity)
163 ns_granularity = elapsed;
164 }
263e529f 165}
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166
167void fill_start_time(struct timeval *t)
168{
169 memcpy(t, &genesis, sizeof(genesis));
170}