Move {is,load}_blktrace() to a new header blktrace.h
[fio.git] / time.c
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 void timeval_add_msec(struct timeval *tv, unsigned int msec)
10 {
11         unsigned long adj_usec = 1000 * msec;
12
13         tv->tv_usec += adj_usec;
14         if (adj_usec >= 1000000) {
15                 unsigned long adj_sec = adj_usec / 1000000;
16
17                 tv->tv_usec -=  adj_sec * 1000000;
18                 tv->tv_sec += adj_sec;
19         }
20         if (tv->tv_usec >= 1000000){
21                 tv->tv_usec -= 1000000;
22                 tv->tv_sec++;
23         }
24 }
25
26 /*
27  * busy looping version for the last few usec
28  */
29 uint64_t usec_spin(unsigned int usec)
30 {
31         struct timeval start;
32         uint64_t t;
33
34         fio_gettime(&start, NULL);
35         while ((t = utime_since_now(&start)) < usec)
36                 nop;
37
38         return t;
39 }
40
41 uint64_t usec_sleep(struct thread_data *td, unsigned long usec)
42 {
43         struct timespec req;
44         struct timeval tv;
45         uint64_t t = 0;
46
47         do {
48                 unsigned long ts = usec;
49
50                 if (usec < ns_granularity) {
51                         t += usec_spin(usec);
52                         break;
53                 }
54
55                 ts = usec - ns_granularity;
56
57                 if (ts >= 1000000) {
58                         req.tv_sec = ts / 1000000;
59                         ts -= 1000000 * req.tv_sec;
60                 } else
61                         req.tv_sec = 0;
62
63                 req.tv_nsec = ts * 1000;
64                 fio_gettime(&tv, NULL);
65
66                 if (nanosleep(&req, NULL) < 0)
67                         break;
68
69                 ts = utime_since_now(&tv);
70                 t += ts;
71                 if (ts >= usec)
72                         break;
73
74                 usec -= ts;
75         } while (!td->terminate);
76
77         return t;
78 }
79
80 uint64_t time_since_genesis(void)
81 {
82         return time_since_now(&genesis);
83 }
84
85 uint64_t mtime_since_genesis(void)
86 {
87         return mtime_since_now(&genesis);
88 }
89
90 uint64_t utime_since_genesis(void)
91 {
92         return utime_since_now(&genesis);
93 }
94
95 bool in_ramp_time(struct thread_data *td)
96 {
97         return td->o.ramp_time && !td->ramp_time_over;
98 }
99
100 static void parent_update_ramp(struct thread_data *td)
101 {
102         struct thread_data *parent = td->parent;
103
104         if (!parent || parent->ramp_time_over)
105                 return;
106
107         reset_all_stats(parent);
108         parent->ramp_time_over = 1;
109         td_set_runstate(parent, TD_RAMP);
110 }
111
112 bool ramp_time_over(struct thread_data *td)
113 {
114         struct timeval tv;
115
116         if (!td->o.ramp_time || td->ramp_time_over)
117                 return true;
118
119         fio_gettime(&tv, NULL);
120         if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
121                 td->ramp_time_over = 1;
122                 reset_all_stats(td);
123                 td_set_runstate(td, TD_RAMP);
124                 parent_update_ramp(td);
125                 return true;
126         }
127
128         return false;
129 }
130
131 void fio_time_init(void)
132 {
133         int i;
134
135         fio_clock_init();
136
137         /*
138          * Check the granularity of the nanosleep function
139          */
140         for (i = 0; i < 10; i++) {
141                 struct timeval tv;
142                 struct timespec ts;
143                 unsigned long elapsed;
144
145                 fio_gettime(&tv, NULL);
146                 ts.tv_sec = 0;
147                 ts.tv_nsec = 1000;
148
149                 nanosleep(&ts, NULL);
150                 elapsed = utime_since_now(&tv);
151
152                 if (elapsed > ns_granularity)
153                         ns_granularity = elapsed;
154         }
155 }
156
157 void set_genesis_time(void)
158 {
159         fio_gettime(&genesis, NULL);
160 }
161
162 void set_epoch_time(struct thread_data *td, int log_unix_epoch)
163 {
164         fio_gettime(&td->epoch, NULL);
165         if (log_unix_epoch) {
166                 struct timeval tv;
167                 gettimeofday(&tv, NULL);
168                 td->unix_epoch = (unsigned long long)(tv.tv_sec) * 1000 +
169                                  (unsigned long long)(tv.tv_usec) / 1000;
170         }
171 }
172
173 void fill_start_time(struct timeval *t)
174 {
175         memcpy(t, &genesis, sizeof(genesis));
176 }