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 bool 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 false;
 106
 107         reset_all_stats(parent);
 108         parent->ramp_time_over = true;
 109         td_set_runstate(parent, TD_RAMP);
 110         return true;
 111 }
 112
 113 bool ramp_time_over(struct thread_data *td)
 114 {
 115         if (!td->o.ramp_time || td->ramp_time_over)
 116                 return true;
 117
 118         if (utime_since_now(&td->epoch) >= td->o.ramp_time) {
 119                 td->ramp_time_over = true;
 120                 reset_all_stats(td);
 121                 td_set_runstate(td, TD_RAMP);
 122
 123                 /*
 124                  * If we have a parent, the parent isn't doing IO. Hence
 125                  * the parent never enters do_io(), which will switch us
 126                  * from RAMP -> RUNNING. Do this manually here.
 127                  */
 128                 if (parent_update_ramp(td))
 129                         td_set_runstate(td, TD_RUNNING);
 130
 131                 return true;
 132         }
 133
 134         return false;
 135 }
 136
 137 void fio_time_init(void)
 138 {
 139         int i;
 140
 141         fio_clock_init();
 142
 143         /*
 144          * Check the granularity of the nanosleep function
 145          */
 146         for (i = 0; i < 10; i++) {
 147                 struct timespec tv, ts;
 148                 unsigned long elapsed;
 149
 150                 fio_gettime(&tv, NULL);
 151                 ts.tv_sec = 0;
 152                 ts.tv_nsec = 1000;
 153
 154                 nanosleep(&ts, NULL);
 155                 elapsed = utime_since_now(&tv);
 156
 157                 if (elapsed > ns_granularity)
 158                         ns_granularity = elapsed;
 159         }
 160 }
 161
 162 void set_genesis_time(void)
 163 {
 164         fio_gettime(&genesis, NULL);
 165 }
 166
 167 void set_epoch_time(struct thread_data *td, int log_unix_epoch)
 168 {
 169         fio_gettime(&td->epoch, NULL);
 170         if (log_unix_epoch) {
 171                 struct timeval tv;
 172                 gettimeofday(&tv, NULL);
 173                 td->unix_epoch = (unsigned long long)(tv.tv_sec) * 1000 +
 174                                  (unsigned long long)(tv.tv_usec) / 1000;
 175         }
 176 }
 177
 178 void fill_start_time(struct timespec *t)
 179 {
 180         memcpy(t, &genesis, sizeof(genesis));
 181 }