Jens Axboe | 39ab7da | 2012-11-06 22:10:43 +0100 | [diff] [blame] | 1 | #include <unistd.h> |
| 2 | #include <math.h> |
| 3 | #include <sys/time.h> |
| 4 | #include <time.h> |
| 5 | |
| 6 | #include "fio.h" |
| 7 | #include "smalloc.h" |
| 8 | |
Jens Axboe | 5be4c94 | 2013-02-11 16:33:25 +0100 | [diff] [blame] | 9 | struct timeval *fio_tv = NULL; |
Jens Axboe | 39ab7da | 2012-11-06 22:10:43 +0100 | [diff] [blame] | 10 | int fio_gtod_offload = 0; |
| 11 | int fio_gtod_cpu = -1; |
| 12 | static pthread_t gtod_thread; |
| 13 | |
| 14 | void fio_gtod_init(void) |
| 15 | { |
| 16 | fio_tv = smalloc(sizeof(struct timeval)); |
Jens Axboe | fba5c5f | 2013-01-29 22:29:09 +0100 | [diff] [blame] | 17 | if (!fio_tv) |
| 18 | log_err("fio: smalloc pool exhausted\n"); |
Jens Axboe | 39ab7da | 2012-11-06 22:10:43 +0100 | [diff] [blame] | 19 | } |
| 20 | |
| 21 | static void fio_gtod_update(void) |
| 22 | { |
Jens Axboe | fba5c5f | 2013-01-29 22:29:09 +0100 | [diff] [blame] | 23 | if (fio_tv) |
| 24 | gettimeofday(fio_tv, NULL); |
Jens Axboe | 39ab7da | 2012-11-06 22:10:43 +0100 | [diff] [blame] | 25 | } |
| 26 | |
| 27 | static void *gtod_thread_main(void *data) |
| 28 | { |
| 29 | struct fio_mutex *mutex = data; |
| 30 | |
| 31 | fio_mutex_up(mutex); |
| 32 | |
| 33 | /* |
| 34 | * As long as we have jobs around, update the clock. It would be nice |
| 35 | * to have some way of NOT hammering that CPU with gettimeofday(), |
| 36 | * but I'm not sure what to use outside of a simple CPU nop to relax |
| 37 | * it - we don't want to lose precision. |
| 38 | */ |
| 39 | while (threads) { |
| 40 | fio_gtod_update(); |
| 41 | nop; |
| 42 | } |
| 43 | |
| 44 | return NULL; |
| 45 | } |
| 46 | |
| 47 | int fio_start_gtod_thread(void) |
| 48 | { |
| 49 | struct fio_mutex *mutex; |
| 50 | pthread_attr_t attr; |
| 51 | int ret; |
| 52 | |
| 53 | mutex = fio_mutex_init(FIO_MUTEX_LOCKED); |
| 54 | if (!mutex) |
| 55 | return 1; |
| 56 | |
| 57 | pthread_attr_init(&attr); |
| 58 | pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN); |
| 59 | ret = pthread_create(>od_thread, &attr, gtod_thread_main, NULL); |
| 60 | pthread_attr_destroy(&attr); |
| 61 | if (ret) { |
| 62 | log_err("Can't create gtod thread: %s\n", strerror(ret)); |
| 63 | goto err; |
| 64 | } |
| 65 | |
| 66 | ret = pthread_detach(gtod_thread); |
| 67 | if (ret) { |
| 68 | log_err("Can't detatch gtod thread: %s\n", strerror(ret)); |
| 69 | goto err; |
| 70 | } |
| 71 | |
| 72 | dprint(FD_MUTEX, "wait on startup_mutex\n"); |
| 73 | fio_mutex_down(mutex); |
| 74 | dprint(FD_MUTEX, "done waiting on startup_mutex\n"); |
| 75 | err: |
| 76 | fio_mutex_remove(mutex); |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | |