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Sourcecode: fio version File versions

time.c

#include <time.h>
#include <sys/time.h>

#include "fio.h"

static struct timeval genesis;
static unsigned long ns_granularity;

unsigned long long utime_since(struct timeval *s, struct timeval *e)
{
      long sec, usec;
      unsigned long long ret;

      sec = e->tv_sec - s->tv_sec;
      usec = e->tv_usec - s->tv_usec;
      if (sec > 0 && usec < 0) {
            sec--;
            usec += 1000000;
      }

      /*
       * time warp bug on some kernels?
       */
      if (sec < 0 || (sec == 0 && usec < 0))
            return 0;

      ret = sec * 1000000ULL + usec;

      return ret;
}

unsigned long long utime_since_now(struct timeval *s)
{
      struct timeval t;

      fio_gettime(&t, NULL);
      return utime_since(s, &t);
}

unsigned long mtime_since(struct timeval *s, struct timeval *e)
{
      long sec, usec, ret;

      sec = e->tv_sec - s->tv_sec;
      usec = e->tv_usec - s->tv_usec;
      if (sec > 0 && usec < 0) {
            sec--;
            usec += 1000000;
      }

      sec *= 1000UL;
      usec /= 1000UL;
      ret = sec + usec;

      /*
       * time warp bug on some kernels?
       */
      if (ret < 0)
            ret = 0;

      return ret;
}

unsigned long mtime_since_now(struct timeval *s)
{
      struct timeval t;
      void *p = __builtin_return_address(0);

      fio_gettime(&t, p);
      return mtime_since(s, &t);
}

unsigned long time_since_now(struct timeval *s)
{
      return mtime_since_now(s) / 1000;
}

/*
 * busy looping version for the last few usec
 */
void usec_spin(unsigned int usec)
{
      struct timeval start;

      fio_gettime(&start, NULL);
      while (utime_since_now(&start) < usec)
            nop;
}

void usec_sleep(struct thread_data *td, unsigned long usec)
{
      struct timespec req;
      struct timeval tv;

      do {
            unsigned long ts = usec;

            if (usec < ns_granularity) {
                  usec_spin(usec);
                  break;
            }

            ts = usec - ns_granularity;

            if (ts >= 1000000) {
                  req.tv_sec = ts / 1000000;
                  ts -= 1000000 * req.tv_sec;
            } else
                  req.tv_sec = 0;

            req.tv_nsec = ts * 1000;
            fio_gettime(&tv, NULL);

            if (nanosleep(&req, NULL) < 0)
                  break;

            ts = utime_since_now(&tv);
            if (ts >= usec)
                  break;

            usec -= ts;
      } while (!td->terminate);
}

unsigned long mtime_since_genesis(void)
{
      return mtime_since_now(&genesis);
}

int in_ramp_time(struct thread_data *td)
{
      return td->o.ramp_time && !td->ramp_time_over;
}

int ramp_time_over(struct thread_data *td)
{
      struct timeval tv;

      if (!td->o.ramp_time || td->ramp_time_over)
            return 1;

      fio_gettime(&tv, NULL);
      if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
            td->ramp_time_over = 1;
            reset_all_stats(td);
            td_set_runstate(td, TD_RAMP);
            return 1;
      }

      return 0;
}

static void fio_init time_init(void)
{
      int i;

      /*
       * Check the granularity of the nanosleep function
       */
      for (i = 0; i < 10; i++) {
            struct timeval tv;
            struct timespec ts;
            unsigned long elapsed;

            fio_gettime(&tv, NULL);
            ts.tv_sec = 0;
            ts.tv_nsec = 1000;

            nanosleep(&ts, NULL);
            elapsed = utime_since_now(&tv);

            if (elapsed > ns_granularity)
                  ns_granularity = elapsed;
      }
}

void set_genesis_time(void)
{
      fio_gettime(&genesis, NULL);
}

void fill_start_time(struct timeval *t)
{
      memcpy(t, &genesis, sizeof(genesis));
}

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