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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 | ||
42 | fio_mutex_down(flow_lock); | |
43 | ||
44 | flist_for_each(n, flow_list) { | |
45 | flow = flist_entry(n, struct fio_flow, list); | |
46 | if (flow->id == id) | |
47 | break; | |
48 | ||
49 | flow = NULL; | |
50 | } | |
51 | ||
52 | if (!flow) { | |
53 | flow = smalloc(sizeof(*flow)); | |
54 | flow->refs = 0; | |
55 | INIT_FLIST_HEAD(&flow->list); | |
56 | flow->id = id; | |
57 | flow->flow_counter = 0; | |
58 | ||
59 | flist_add_tail(&flow->list, flow_list); | |
60 | } | |
61 | ||
62 | flow->refs++; | |
63 | fio_mutex_up(flow_lock); | |
64 | return flow; | |
65 | } | |
66 | ||
67 | static void flow_put(struct fio_flow *flow) | |
68 | { | |
69 | fio_mutex_down(flow_lock); | |
70 | ||
71 | if (!--flow->refs) { | |
72 | flist_del(&flow->list); | |
73 | sfree(flow); | |
74 | } | |
75 | ||
76 | fio_mutex_up(flow_lock); | |
77 | } | |
78 | ||
79 | void flow_init_job(struct thread_data *td) | |
80 | { | |
81 | if (td->o.flow) | |
82 | td->flow = flow_get(td->o.flow_id); | |
83 | } | |
84 | ||
85 | void flow_exit_job(struct thread_data *td) | |
86 | { | |
87 | if (td->flow) { | |
88 | flow_put(td->flow); | |
89 | td->flow = NULL; | |
90 | } | |
91 | } | |
92 | ||
93 | void flow_init(void) | |
94 | { | |
95 | flow_lock = fio_mutex_init(1); | |
96 | flow_list = smalloc(sizeof(*flow_list)); | |
97 | INIT_FLIST_HEAD(flow_list); | |
98 | } | |
99 | ||
100 | void flow_exit(void) | |
101 | { | |
102 | fio_mutex_remove(flow_lock); | |
103 | sfree(flow_list); | |
104 | } |