projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| 9e684a49 DE |
1 | #include "fio.h" |
| 2 | #include "mutex.h" | |
| 3 | #include "smalloc.h" | |
| 4 | #include "flist.h" | |
| 5 | ||
| 6 | struct fio_flow { | |
| 7 | unsigned int refs; | |
| 8 | struct flist_head list; | |
| 9 | unsigned int id; | |
| 10 | long long int flow_counter; | |
| 11 | }; | |
| 12 | ||
| 13 | static struct flist_head *flow_list; | |
| 14 | static struct fio_mutex *flow_lock; | |
| 15 | ||
| 16 | int flow_threshold_exceeded(struct thread_data *td) | |
| 17 | { | |
| 18 | struct fio_flow *flow = td->flow; | |
| 19 | int sign; | |
| 20 | ||
| 21 | if (!flow) | |
| 22 | return 0; | |
| 23 | ||
| 24 | sign = td->o.flow > 0 ? 1 : -1; | |
| 25 | if (sign * flow->flow_counter > td->o.flow_watermark) { | |
| 26 | if (td->o.flow_sleep) | |
| 27 | usleep(td->o.flow_sleep); | |
| 28 | return 1; | |
| 29 | } | |
| 30 | ||
| 31 | /* No synchronization needed because it doesn't | |
| 32 | * matter if the flow count is slightly inaccurate */ | |
| 33 | flow->flow_counter += td->o.flow; | |
| 34 | return 0; | |
| 35 | } | |
| 36 | ||
| 37 | static struct fio_flow *flow_get(unsigned int id) | |
| 38 | { | |
| 8e8b225d | 39 | struct fio_flow *flow = NULL; |
| 9e684a49 DE |
40 | struct flist_head *n; |
| 41 | ||
| fba5c5ff JA |
42 | if (!flow_lock) |
| 43 | return NULL; | |
| 44 | ||
| 9e684a49 DE |
45 | fio_mutex_down(flow_lock); |
| 46 | ||
| 47 | flist_for_each(n, flow_list) { | |
| 48 | flow = flist_entry(n, struct fio_flow, list); | |
| 49 | if (flow->id == id) | |
| 50 | break; | |
| 51 | ||
| 52 | flow = NULL; | |
| 53 | } | |
| 54 | ||
| 55 | if (!flow) { | |
| 56 | flow = smalloc(sizeof(*flow)); | |
| fba5c5ff JA |
57 | if (!flow) { |
| 58 | log_err("fio: smalloc pool exhausted\n"); | |
| 59 | return NULL; | |
| 60 | } | |
| 9e684a49 DE |
61 | flow->refs = 0; |
| 62 | INIT_FLIST_HEAD(&flow->list); | |
| 63 | flow->id = id; | |
| 64 | flow->flow_counter = 0; | |
| 65 | ||
| 66 | flist_add_tail(&flow->list, flow_list); | |
| 67 | } | |
| 68 | ||
| 69 | flow->refs++; | |
| 70 | fio_mutex_up(flow_lock); | |
| 71 | return flow; | |
| 72 | } | |
| 73 | ||
| 74 | static void flow_put(struct fio_flow *flow) | |
| 75 | { | |
| fba5c5ff JA |
76 | if (!flow_lock) |
| 77 | return; | |
| 78 | ||
| 9e684a49 DE |
79 | fio_mutex_down(flow_lock); |
| 80 | ||
| 81 | if (!--flow->refs) { | |
| 82 | flist_del(&flow->list); | |
| 83 | sfree(flow); | |
| 84 | } | |
| 85 | ||
| 86 | fio_mutex_up(flow_lock); | |
| 87 | } | |
| 88 | ||
| 89 | void flow_init_job(struct thread_data *td) | |
| 90 | { | |
| 91 | if (td->o.flow) | |
| 92 | td->flow = flow_get(td->o.flow_id); | |
| 93 | } | |
| 94 | ||
| 95 | void flow_exit_job(struct thread_data *td) | |
| 96 | { | |
| 97 | if (td->flow) { | |
| 98 | flow_put(td->flow); | |
| 99 | td->flow = NULL; | |
| 100 | } | |
| 101 | } | |
| 102 | ||
| 103 | void flow_init(void) | |
| 104 | { | |
| 9e684a49 | 105 | flow_list = smalloc(sizeof(*flow_list)); |
| fba5c5ff JA |
106 | if (!flow_list) { |
| 107 | log_err("fio: smalloc pool exhausted\n"); | |
| 108 | return; | |
| 109 | } | |
| 110 | ||
| 111 | flow_lock = fio_mutex_init(FIO_MUTEX_UNLOCKED); | |
| 112 | if (!flow_lock) { | |
| 113 | log_err("fio: failed to allocate flow lock\n"); | |
| 114 | sfree(flow_list); | |
| 115 | return; | |
| 116 | } | |
| 117 | ||
| 9e684a49 DE |
118 | INIT_FLIST_HEAD(flow_list); |
| 119 | } | |
| 120 | ||
| 121 | void flow_exit(void) | |
| 122 | { | |
| fba5c5ff JA |
123 | if (flow_lock) |
| 124 | fio_mutex_remove(flow_lock); | |
| 125 | if (flow_list) | |
| 126 | sfree(flow_list); | |
| 9e684a49 | 127 | } |