Commit | Line | Data |
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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 | ||
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 | } |