Merge branch 'fixes' of https://github.com/sitsofe/fio
[fio.git] / time.c
1 #include <time.h>
2 #include <sys/time.h>
3
4 #include "fio.h"
5
6 static struct timespec genesis;
7 static unsigned long ns_granularity;
8
9 void timespec_add_msec(struct timespec *ts, unsigned int msec)
10 {
11         uint64_t adj_nsec = 1000000ULL * msec;
12
13         ts->tv_nsec += adj_nsec;
14         if (adj_nsec >= 1000000000) {
15                 uint64_t adj_sec = adj_nsec / 1000000000;
16
17                 ts->tv_nsec -= adj_sec * 1000000000;
18                 ts->tv_sec += adj_sec;
19         }
20         if (ts->tv_nsec >= 1000000000){
21                 ts->tv_nsec -= 1000000000;
22                 ts->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 timespec 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 timespec 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         if (!td->o.ramp_time || td->ramp_time_over)
115                 return true;
116
117         if (utime_since_now(&td->epoch) >= td->o.ramp_time) {
118                 td->ramp_time_over = 1;
119                 reset_all_stats(td);
120                 td_set_runstate(td, TD_RAMP);
121                 parent_update_ramp(td);
122                 return true;
123         }
124
125         return false;
126 }
127
128 void fio_time_init(void)
129 {
130         int i;
131
132         fio_clock_init();
133
134         /*
135          * Check the granularity of the nanosleep function
136          */
137         for (i = 0; i < 10; i++) {
138                 struct timespec tv, ts;
139                 unsigned long elapsed;
140
141                 fio_gettime(&tv, NULL);
142                 ts.tv_sec = 0;
143                 ts.tv_nsec = 1000;
144
145                 nanosleep(&ts, NULL);
146                 elapsed = utime_since_now(&tv);
147
148                 if (elapsed > ns_granularity)
149                         ns_granularity = elapsed;
150         }
151 }
152
153 void set_genesis_time(void)
154 {
155         fio_gettime(&genesis, NULL);
156 }
157
158 void set_epoch_time(struct thread_data *td, int log_unix_epoch)
159 {
160         fio_gettime(&td->epoch, NULL);
161         if (log_unix_epoch) {
162                 struct timeval tv;
163                 gettimeofday(&tv, NULL);
164                 td->unix_epoch = (unsigned long long)(tv.tv_sec) * 1000 +
165                                  (unsigned long long)(tv.tv_usec) / 1000;
166         }
167 }
168
169 void fill_start_time(struct timespec *t)
170 {
171         memcpy(t, &genesis, sizeof(genesis));
172 }