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      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 /*
     10  * busy looping version for the last few usec
     11  */
     12 void usec_spin(unsigned int usec)
     13 {
     14 	struct timeval start;
     15 
     16 	fio_gettime(&start, NULL);
     17 	while (utime_since_now(&start) < usec)
     18 		nop;
     19 }
     20 
     21 void usec_sleep(struct thread_data *td, unsigned long usec)
     22 {
     23 	struct timespec req;
     24 	struct timeval tv;
     25 
     26 	do {
     27 		unsigned long ts = usec;
     28 
     29 		if (usec < ns_granularity) {
     30 			usec_spin(usec);
     31 			break;
     32 		}
     33 
     34 		ts = usec - ns_granularity;
     35 
     36 		if (ts >= 1000000) {
     37 			req.tv_sec = ts / 1000000;
     38 			ts -= 1000000 * req.tv_sec;
     39 		} else
     40 			req.tv_sec = 0;
     41 
     42 		req.tv_nsec = ts * 1000;
     43 		fio_gettime(&tv, NULL);
     44 
     45 		if (nanosleep(&req, NULL) < 0)
     46 			break;
     47 
     48 		ts = utime_since_now(&tv);
     49 		if (ts >= usec)
     50 			break;
     51 
     52 		usec -= ts;
     53 	} while (!td->terminate);
     54 }
     55 
     56 uint64_t mtime_since_genesis(void)
     57 {
     58 	return mtime_since_now(&genesis);
     59 }
     60 
     61 uint64_t utime_since_genesis(void)
     62 {
     63 	return utime_since_now(&genesis);
     64 }
     65 
     66 int in_ramp_time(struct thread_data *td)
     67 {
     68 	return td->o.ramp_time && !td->ramp_time_over;
     69 }
     70 
     71 int ramp_time_over(struct thread_data *td)
     72 {
     73 	struct timeval tv;
     74 
     75 	if (!td->o.ramp_time || td->ramp_time_over)
     76 		return 1;
     77 
     78 	fio_gettime(&tv, NULL);
     79 	if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
     80 		td->ramp_time_over = 1;
     81 		reset_all_stats(td);
     82 		td_set_runstate(td, TD_RAMP);
     83 		return 1;
     84 	}
     85 
     86 	return 0;
     87 }
     88 
     89 void fio_time_init(void)
     90 {
     91 	int i;
     92 
     93 	fio_clock_init();
     94 
     95 	/*
     96 	 * Check the granularity of the nanosleep function
     97 	 */
     98 	for (i = 0; i < 10; i++) {
     99 		struct timeval tv;
    100 		struct timespec ts;
    101 		unsigned long elapsed;
    102 
    103 		fio_gettime(&tv, NULL);
    104 		ts.tv_sec = 0;
    105 		ts.tv_nsec = 1000;
    106 
    107 		nanosleep(&ts, NULL);
    108 		elapsed = utime_since_now(&tv);
    109 
    110 		if (elapsed > ns_granularity)
    111 			ns_granularity = elapsed;
    112 	}
    113 }
    114 
    115 void set_genesis_time(void)
    116 {
    117 	fio_gettime(&genesis, NULL);
    118 }
    119 
    120 void fill_start_time(struct timeval *t)
    121 {
    122 	memcpy(t, &genesis, sizeof(genesis));
    123 }
    124