Commit | Line | Data |
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39ab7da2 JA |
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 | ||
5be4c944 | 9 | struct timeval *fio_tv = NULL; |
39ab7da2 JA |
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)); | |
fba5c5ff JA |
17 | if (!fio_tv) |
18 | log_err("fio: smalloc pool exhausted\n"); | |
39ab7da2 JA |
19 | } |
20 | ||
21 | static void fio_gtod_update(void) | |
22 | { | |
27325ed5 JA |
23 | if (fio_tv) { |
24 | struct timeval __tv; | |
25 | ||
26 | gettimeofday(&__tv, NULL); | |
27 | fio_tv->tv_sec = __tv.tv_sec; | |
28 | write_barrier(); | |
29 | fio_tv->tv_usec = __tv.tv_usec; | |
30 | write_barrier(); | |
31 | } | |
39ab7da2 JA |
32 | } |
33 | ||
34 | static void *gtod_thread_main(void *data) | |
35 | { | |
36 | struct fio_mutex *mutex = data; | |
37 | ||
38 | fio_mutex_up(mutex); | |
39 | ||
40 | /* | |
41 | * As long as we have jobs around, update the clock. It would be nice | |
42 | * to have some way of NOT hammering that CPU with gettimeofday(), | |
43 | * but I'm not sure what to use outside of a simple CPU nop to relax | |
44 | * it - we don't want to lose precision. | |
45 | */ | |
46 | while (threads) { | |
47 | fio_gtod_update(); | |
48 | nop; | |
49 | } | |
50 | ||
51 | return NULL; | |
52 | } | |
53 | ||
54 | int fio_start_gtod_thread(void) | |
55 | { | |
56 | struct fio_mutex *mutex; | |
57 | pthread_attr_t attr; | |
58 | int ret; | |
59 | ||
60 | mutex = fio_mutex_init(FIO_MUTEX_LOCKED); | |
61 | if (!mutex) | |
62 | return 1; | |
63 | ||
64 | pthread_attr_init(&attr); | |
65 | pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN); | |
80fa0520 | 66 | ret = pthread_create(>od_thread, &attr, gtod_thread_main, mutex); |
39ab7da2 JA |
67 | pthread_attr_destroy(&attr); |
68 | if (ret) { | |
69 | log_err("Can't create gtod thread: %s\n", strerror(ret)); | |
70 | goto err; | |
71 | } | |
72 | ||
73 | ret = pthread_detach(gtod_thread); | |
74 | if (ret) { | |
75 | log_err("Can't detatch gtod thread: %s\n", strerror(ret)); | |
76 | goto err; | |
77 | } | |
78 | ||
79 | dprint(FD_MUTEX, "wait on startup_mutex\n"); | |
80 | fio_mutex_down(mutex); | |
81 | dprint(FD_MUTEX, "done waiting on startup_mutex\n"); | |
82 | err: | |
83 | fio_mutex_remove(mutex); | |
84 | return ret; | |
85 | } | |
86 | ||
87 |