| 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 | } |