Clear f on error get_next_file_rr()
[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
10927316 9unsigned long long utime_since(struct timeval *s, struct timeval *e)
3c39a379 10{
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11 long sec, usec;
12 unsigned long long ret;
5ec10eaa 13
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14 sec = e->tv_sec - s->tv_sec;
15 usec = e->tv_usec - s->tv_usec;
16 if (sec > 0 && usec < 0) {
17 sec--;
18 usec += 1000000;
19 }
20
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21 /*
22 * time warp bug on some kernels?
23 */
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24 if (sec < 0 || (sec == 0 && usec < 0))
25 return 0;
5ec10eaa 26
10927316 27 ret = sec * 1000000ULL + usec;
5ec10eaa 28
2bfe24bd 29 return ret;
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30}
31
10927316 32unsigned long long utime_since_now(struct timeval *s)
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33{
34 struct timeval t;
35
02bcaa8c 36 fio_gettime(&t, NULL);
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37 return utime_since(s, &t);
38}
39
40unsigned long mtime_since(struct timeval *s, struct timeval *e)
41{
2bfe24bd 42 long sec, usec, ret;
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43
44 sec = e->tv_sec - s->tv_sec;
45 usec = e->tv_usec - s->tv_usec;
46 if (sec > 0 && usec < 0) {
47 sec--;
48 usec += 1000000;
49 }
50
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51 sec *= 1000UL;
52 usec /= 1000UL;
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53 ret = sec + usec;
54
55 /*
56 * time warp bug on some kernels?
57 */
58 if (ret < 0)
59 ret = 0;
3c39a379 60
2bfe24bd 61 return ret;
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62}
63
64unsigned long mtime_since_now(struct timeval *s)
65{
66 struct timeval t;
02bcaa8c 67 void *p = __builtin_return_address(0);
3c39a379 68
02bcaa8c 69 fio_gettime(&t, p);
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70 return mtime_since(s, &t);
71}
72
73unsigned long time_since_now(struct timeval *s)
74{
75 return mtime_since_now(s) / 1000;
76}
77
78/*
79 * busy looping version for the last few usec
80 */
6dd6f2cd 81void usec_spin(unsigned int usec)
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82{
83 struct timeval start;
84
02bcaa8c 85 fio_gettime(&start, NULL);
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86 while (utime_since_now(&start) < usec)
87 nop;
88}
89
90void usec_sleep(struct thread_data *td, unsigned long usec)
91{
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92 struct timespec req;
93 struct timeval tv;
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94
95 do {
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96 unsigned long ts = usec;
97
98 if (usec < ns_granularity) {
6dd6f2cd 99 usec_spin(usec);
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100 break;
101 }
102
fd841467 103 ts = usec - ns_granularity;
3c39a379 104
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105 if (ts >= 1000000) {
106 req.tv_sec = ts / 1000000;
107 ts -= 1000000 * req.tv_sec;
108 } else
109 req.tv_sec = 0;
110
111 req.tv_nsec = ts * 1000;
112 fio_gettime(&tv, NULL);
113
114 if (nanosleep(&req, NULL) < 0)
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115 break;
116
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117 ts = utime_since_now(&tv);
118 if (ts >= usec)
119 break;
3c39a379 120
fd841467 121 usec -= ts;
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122 } while (!td->terminate);
123}
124
125void rate_throttle(struct thread_data *td, unsigned long time_spent,
413dd459 126 unsigned int bytes)
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127{
128 unsigned long usec_cycle;
c3852ae2 129 unsigned int bs;
3c39a379 130
2dc1bbeb 131 if (!td->o.rate && !td->o.rate_iops)
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132 return;
133
c3852ae2 134 if (td_rw(td))
2dc1bbeb 135 bs = td->o.rw_min_bs;
c3852ae2 136 else if (td_read(td))
2dc1bbeb 137 bs = td->o.min_bs[DDIR_READ];
c3852ae2 138 else
2dc1bbeb 139 bs = td->o.min_bs[DDIR_WRITE];
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140
141 usec_cycle = td->rate_usec_cycle * (bytes / bs);
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142
143 if (time_spent < usec_cycle) {
144 unsigned long s = usec_cycle - time_spent;
145
146 td->rate_pending_usleep += s;
a998c869 147
3c39a379 148 if (td->rate_pending_usleep >= 100000) {
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149 struct timeval t;
150
151 fio_gettime(&t, NULL);
3c39a379 152 usec_sleep(td, td->rate_pending_usleep);
a998c869 153 td->rate_pending_usleep -= utime_since_now(&t);
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154 }
155 } else {
156 long overtime = time_spent - usec_cycle;
157
158 td->rate_pending_usleep -= overtime;
159 }
160}
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161
162unsigned long mtime_since_genesis(void)
163{
164 return mtime_since_now(&genesis);
165}
166
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167int in_ramp_time(struct thread_data *td)
168{
169 return td->o.ramp_time && !td->ramp_time_over;
170}
171
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172int ramp_time_over(struct thread_data *td)
173{
174 struct timeval tv;
175
176 if (!td->o.ramp_time || td->ramp_time_over)
177 return 1;
178
179 fio_gettime(&tv, NULL);
180 if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
181 td->ramp_time_over = 1;
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182 reset_all_stats(td);
183 td_set_runstate(td, TD_RAMP);
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184 return 1;
185 }
186
187 return 0;
188}
189
02bcaa8c 190static void fio_init time_init(void)
263e529f 191{
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192 int i;
193
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194 /*
195 * Check the granularity of the nanosleep function
196 */
197 for (i = 0; i < 10; i++) {
198 struct timeval tv;
199 struct timespec ts;
200 unsigned long elapsed;
201
202 fio_gettime(&tv, NULL);
203 ts.tv_sec = 0;
204 ts.tv_nsec = 1000;
205
206 nanosleep(&ts, NULL);
207 elapsed = utime_since_now(&tv);
208
209 if (elapsed > ns_granularity)
210 ns_granularity = elapsed;
211 }
263e529f 212}
6043c579 213
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214void set_genesis_time(void)
215{
216 fio_gettime(&genesis, NULL);
217}
218
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219void fill_start_time(struct timeval *t)
220{
221 memcpy(t, &genesis, sizeof(genesis));
222}