projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| 3c39a379 JA |
1 | #include <time.h> |
| 2 | #include <sys/time.h> | |
| 3 | ||
| 4 | #include "fio.h" | |
| 5 | ||
| 6 | unsigned long utime_since(struct timeval *s, struct timeval *e) | |
| 7 | { | |
| 8 | double sec, usec; | |
| 9 | ||
| 10 | sec = e->tv_sec - s->tv_sec; | |
| 11 | usec = e->tv_usec - s->tv_usec; | |
| 12 | if (sec > 0 && usec < 0) { | |
| 13 | sec--; | |
| 14 | usec += 1000000; | |
| 15 | } | |
| 16 | ||
| 17 | sec *= (double) 1000000; | |
| 18 | ||
| 19 | return sec + usec; | |
| 20 | } | |
| 21 | ||
| 22 | static unsigned long utime_since_now(struct timeval *s) | |
| 23 | { | |
| 24 | struct timeval t; | |
| 25 | ||
| 26 | gettimeofday(&t, NULL); | |
| 27 | return utime_since(s, &t); | |
| 28 | } | |
| 29 | ||
| 30 | unsigned long mtime_since(struct timeval *s, struct timeval *e) | |
| 31 | { | |
| 32 | double sec, usec; | |
| 33 | ||
| 34 | sec = e->tv_sec - s->tv_sec; | |
| 35 | usec = e->tv_usec - s->tv_usec; | |
| 36 | if (sec > 0 && usec < 0) { | |
| 37 | sec--; | |
| 38 | usec += 1000000; | |
| 39 | } | |
| 40 | ||
| 41 | sec *= (double) 1000; | |
| 42 | usec /= (double) 1000; | |
| 43 | ||
| 44 | return sec + usec; | |
| 45 | } | |
| 46 | ||
| 47 | unsigned long mtime_since_now(struct timeval *s) | |
| 48 | { | |
| 49 | struct timeval t; | |
| 50 | ||
| 51 | gettimeofday(&t, NULL); | |
| 52 | return mtime_since(s, &t); | |
| 53 | } | |
| 54 | ||
| 55 | unsigned long time_since_now(struct timeval *s) | |
| 56 | { | |
| 57 | return mtime_since_now(s) / 1000; | |
| 58 | } | |
| 59 | ||
| 60 | /* | |
| 61 | * busy looping version for the last few usec | |
| 62 | */ | |
| 63 | static void __usec_sleep(unsigned int usec) | |
| 64 | { | |
| 65 | struct timeval start; | |
| 66 | ||
| 67 | gettimeofday(&start, NULL); | |
| 68 | while (utime_since_now(&start) < usec) | |
| 69 | nop; | |
| 70 | } | |
| 71 | ||
| 72 | void usec_sleep(struct thread_data *td, unsigned long usec) | |
| 73 | { | |
| 74 | struct timespec req, rem; | |
| 75 | ||
| 76 | req.tv_sec = usec / 1000000; | |
| 77 | req.tv_nsec = usec * 1000 - req.tv_sec * 1000000; | |
| 78 | ||
| 79 | do { | |
| 80 | if (usec < 5000) { | |
| 81 | __usec_sleep(usec); | |
| 82 | break; | |
| 83 | } | |
| 84 | ||
| 85 | rem.tv_sec = rem.tv_nsec = 0; | |
| 86 | if (nanosleep(&req, &rem) < 0) | |
| 87 | break; | |
| 88 | ||
| 89 | if ((rem.tv_sec + rem.tv_nsec) == 0) | |
| 90 | break; | |
| 91 | ||
| 92 | req.tv_nsec = rem.tv_nsec; | |
| 93 | req.tv_sec = rem.tv_sec; | |
| 94 | ||
| 95 | usec = rem.tv_sec * 1000000 + rem.tv_nsec / 1000; | |
| 96 | } while (!td->terminate); | |
| 97 | } | |
| 98 | ||
| 99 | void rate_throttle(struct thread_data *td, unsigned long time_spent, | |
| 100 | unsigned int bytes) | |
| 101 | { | |
| 102 | unsigned long usec_cycle; | |
| 103 | ||
| 104 | if (!td->rate) | |
| 105 | return; | |
| 106 | ||
| 107 | usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs); | |
| 108 | ||
| 109 | if (time_spent < usec_cycle) { | |
| 110 | unsigned long s = usec_cycle - time_spent; | |
| 111 | ||
| 112 | td->rate_pending_usleep += s; | |
| 113 | if (td->rate_pending_usleep >= 100000) { | |
| 114 | usec_sleep(td, td->rate_pending_usleep); | |
| 115 | td->rate_pending_usleep = 0; | |
| 116 | } | |
| 117 | } else { | |
| 118 | long overtime = time_spent - usec_cycle; | |
| 119 | ||
| 120 | td->rate_pending_usleep -= overtime; | |
| 121 | } | |
| 122 | } |