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) { | |
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 | } |