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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 uint64_t usec_spin(unsigned int usec)
     13 {
     14 	struct timeval start;
     15 	uint64_t t;
     16 
     17 	fio_gettime(&start, NULL);
     18 	while ((t = utime_since_now(&start)) < usec)
     19 		nop;
     20 
     21 	return t;
     22 }
     23 
     24 uint64_t usec_sleep(struct thread_data *td, unsigned long usec)
     25 {
     26 	struct timespec req;
     27 	struct timeval tv;
     28 	uint64_t t = 0;
     29 
     30 	do {
     31 		unsigned long ts = usec;
     32 
     33 		if (usec < ns_granularity) {
     34 			t += usec_spin(usec);
     35 			break;
     36 		}
     37 
     38 		ts = usec - ns_granularity;
     39 
     40 		if (ts >= 1000000) {
     41 			req.tv_sec = ts / 1000000;
     42 			ts -= 1000000 * req.tv_sec;
     43 		} else
     44 			req.tv_sec = 0;
     45 
     46 		req.tv_nsec = ts * 1000;
     47 		fio_gettime(&tv, NULL);
     48 
     49 		if (nanosleep(&req, NULL) < 0)
     50 			break;
     51 
     52 		ts = utime_since_now(&tv);
     53 		t += ts;
     54 		if (ts >= usec)
     55 			break;
     56 
     57 		usec -= ts;
     58 	} while (!td->terminate);
     59 
     60 	return t;
     61 }
     62 
     63 uint64_t time_since_genesis(void)
     64 {
     65 	return time_since_now(&genesis);
     66 }
     67 
     68 uint64_t mtime_since_genesis(void)
     69 {
     70 	return mtime_since_now(&genesis);
     71 }
     72 
     73 uint64_t utime_since_genesis(void)
     74 {
     75 	return utime_since_now(&genesis);
     76 }
     77 
     78 int in_ramp_time(struct thread_data *td)
     79 {
     80 	return td->o.ramp_time && !td->ramp_time_over;
     81 }
     82 
     83 int ramp_time_over(struct thread_data *td)
     84 {
     85 	struct timeval tv;
     86 
     87 	if (!td->o.ramp_time || td->ramp_time_over)
     88 		return 1;
     89 
     90 	fio_gettime(&tv, NULL);
     91 	if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
     92 		td->ramp_time_over = 1;
     93 		reset_all_stats(td);
     94 		td_set_runstate(td, TD_RAMP);
     95 		return 1;
     96 	}
     97 
     98 	return 0;
     99 }
    100 
    101 void fio_time_init(void)
    102 {
    103 	int i;
    104 
    105 	fio_clock_init();
    106 
    107 	/*
    108 	 * Check the granularity of the nanosleep function
    109 	 */
    110 	for (i = 0; i < 10; i++) {
    111 		struct timeval tv;
    112 		struct timespec ts;
    113 		unsigned long elapsed;
    114 
    115 		fio_gettime(&tv, NULL);
    116 		ts.tv_sec = 0;
    117 		ts.tv_nsec = 1000;
    118 
    119 		nanosleep(&ts, NULL);
    120 		elapsed = utime_since_now(&tv);
    121 
    122 		if (elapsed > ns_granularity)
    123 			ns_granularity = elapsed;
    124 	}
    125 }
    126 
    127 void set_genesis_time(void)
    128 {
    129 	fio_gettime(&genesis, NULL);
    130 }
    131 
    132 void fill_start_time(struct timeval *t)
    133 {
    134 	memcpy(t, &genesis, sizeof(genesis));
    135 }
    136