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) { | |
| cb44aa1f JA |
26 | if (td->o.flow_sleep) { |
| 27 | io_u_quiesce(td); | |
| 9e684a49 | 28 | usleep(td->o.flow_sleep); |
| cb44aa1f JA |
29 | } |
| 30 | ||
| 9e684a49 DE |
31 | return 1; |
| 32 | } | |
| 33 | ||
| 34 | /* No synchronization needed because it doesn't | |
| 35 | * matter if the flow count is slightly inaccurate */ | |
| 36 | flow->flow_counter += td->o.flow; | |
| 37 | return 0; | |
| 38 | } | |
| 39 | ||
| 40 | static struct fio_flow *flow_get(unsigned int id) | |
| 41 | { | |
| 8e8b225d | 42 | struct fio_flow *flow = NULL; |
| 9e684a49 DE |
43 | struct flist_head *n; |
| 44 | ||
| fba5c5ff JA |
45 | if (!flow_lock) |
| 46 | return NULL; | |
| 47 | ||
| 9e684a49 DE |
48 | fio_mutex_down(flow_lock); |
| 49 | ||
| 50 | flist_for_each(n, flow_list) { | |
| 51 | flow = flist_entry(n, struct fio_flow, list); | |
| 52 | if (flow->id == id) | |
| 53 | break; | |
| 54 | ||
| 55 | flow = NULL; | |
| 56 | } | |
| 57 | ||
| 58 | if (!flow) { | |
| 59 | flow = smalloc(sizeof(*flow)); | |
| fba5c5ff JA |
60 | if (!flow) { |
| 61 | log_err("fio: smalloc pool exhausted\n"); | |
| 8db1ff2a | 62 | fio_mutex_up(flow_lock); |
| fba5c5ff JA |
63 | return NULL; |
| 64 | } | |
| 9e684a49 DE |
65 | flow->refs = 0; |
| 66 | INIT_FLIST_HEAD(&flow->list); | |
| 67 | flow->id = id; | |
| 68 | flow->flow_counter = 0; | |
| 69 | ||
| 70 | flist_add_tail(&flow->list, flow_list); | |
| 71 | } | |
| 72 | ||
| 73 | flow->refs++; | |
| 74 | fio_mutex_up(flow_lock); | |
| 75 | return flow; | |
| 76 | } | |
| 77 | ||
| 78 | static void flow_put(struct fio_flow *flow) | |
| 79 | { | |
| fba5c5ff JA |
80 | if (!flow_lock) |
| 81 | return; | |
| 82 | ||
| 9e684a49 DE |
83 | fio_mutex_down(flow_lock); |
| 84 | ||
| 85 | if (!--flow->refs) { | |
| 86 | flist_del(&flow->list); | |
| 87 | sfree(flow); | |
| 88 | } | |
| 89 | ||
| 90 | fio_mutex_up(flow_lock); | |
| 91 | } | |
| 92 | ||
| 93 | void flow_init_job(struct thread_data *td) | |
| 94 | { | |
| 95 | if (td->o.flow) | |
| 96 | td->flow = flow_get(td->o.flow_id); | |
| 97 | } | |
| 98 | ||
| 99 | void flow_exit_job(struct thread_data *td) | |
| 100 | { | |
| 101 | if (td->flow) { | |
| 102 | flow_put(td->flow); | |
| 103 | td->flow = NULL; | |
| 104 | } | |
| 105 | } | |
| 106 | ||
| 107 | void flow_init(void) | |
| 108 | { | |
| 9e684a49 | 109 | flow_list = smalloc(sizeof(*flow_list)); |
| fba5c5ff JA |
110 | if (!flow_list) { |
| 111 | log_err("fio: smalloc pool exhausted\n"); | |
| 112 | return; | |
| 113 | } | |
| 114 | ||
| 115 | flow_lock = fio_mutex_init(FIO_MUTEX_UNLOCKED); | |
| 116 | if (!flow_lock) { | |
| 117 | log_err("fio: failed to allocate flow lock\n"); | |
| 118 | sfree(flow_list); | |
| 119 | return; | |
| 120 | } | |
| 121 | ||
| 9e684a49 DE |
122 | INIT_FLIST_HEAD(flow_list); |
| 123 | } | |
| 124 | ||
| 125 | void flow_exit(void) | |
| 126 | { | |
| fba5c5ff JA |
127 | if (flow_lock) |
| 128 | fio_mutex_remove(flow_lock); | |
| 129 | if (flow_list) | |
| 130 | sfree(flow_list); | |
| 9e684a49 | 131 | } |