Commit | Line | Data |
---|---|---|
9e684a49 | 1 | #include "fio.h" |
971caeb1 | 2 | #include "fio_sem.h" |
9e684a49 DE |
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; | |
971caeb1 | 14 | static struct fio_sem *flow_lock; |
9e684a49 DE |
15 | |
16 | int flow_threshold_exceeded(struct thread_data *td) | |
17 | { | |
18 | struct fio_flow *flow = td->flow; | |
c13a60ce | 19 | long long flow_counter; |
9e684a49 DE |
20 | |
21 | if (!flow) | |
22 | return 0; | |
23 | ||
c13a60ce JA |
24 | if (td->o.flow > 0) |
25 | flow_counter = flow->flow_counter; | |
26 | else | |
27 | flow_counter = -flow->flow_counter; | |
28 | ||
29 | if (flow_counter > td->o.flow_watermark) { | |
cb44aa1f JA |
30 | if (td->o.flow_sleep) { |
31 | io_u_quiesce(td); | |
9e684a49 | 32 | usleep(td->o.flow_sleep); |
cb44aa1f JA |
33 | } |
34 | ||
9e684a49 DE |
35 | return 1; |
36 | } | |
37 | ||
38 | /* No synchronization needed because it doesn't | |
39 | * matter if the flow count is slightly inaccurate */ | |
40 | flow->flow_counter += td->o.flow; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static struct fio_flow *flow_get(unsigned int id) | |
45 | { | |
8e8b225d | 46 | struct fio_flow *flow = NULL; |
9e684a49 DE |
47 | struct flist_head *n; |
48 | ||
fba5c5ff JA |
49 | if (!flow_lock) |
50 | return NULL; | |
51 | ||
971caeb1 | 52 | fio_sem_down(flow_lock); |
9e684a49 DE |
53 | |
54 | flist_for_each(n, flow_list) { | |
55 | flow = flist_entry(n, struct fio_flow, list); | |
56 | if (flow->id == id) | |
57 | break; | |
58 | ||
59 | flow = NULL; | |
60 | } | |
61 | ||
62 | if (!flow) { | |
63 | flow = smalloc(sizeof(*flow)); | |
fba5c5ff | 64 | if (!flow) { |
971caeb1 | 65 | fio_sem_up(flow_lock); |
fba5c5ff JA |
66 | return NULL; |
67 | } | |
9e684a49 DE |
68 | flow->refs = 0; |
69 | INIT_FLIST_HEAD(&flow->list); | |
70 | flow->id = id; | |
71 | flow->flow_counter = 0; | |
72 | ||
73 | flist_add_tail(&flow->list, flow_list); | |
74 | } | |
75 | ||
76 | flow->refs++; | |
971caeb1 | 77 | fio_sem_up(flow_lock); |
9e684a49 DE |
78 | return flow; |
79 | } | |
80 | ||
81 | static void flow_put(struct fio_flow *flow) | |
82 | { | |
fba5c5ff JA |
83 | if (!flow_lock) |
84 | return; | |
85 | ||
971caeb1 | 86 | fio_sem_down(flow_lock); |
9e684a49 DE |
87 | |
88 | if (!--flow->refs) { | |
89 | flist_del(&flow->list); | |
90 | sfree(flow); | |
91 | } | |
92 | ||
971caeb1 | 93 | fio_sem_up(flow_lock); |
9e684a49 DE |
94 | } |
95 | ||
96 | void flow_init_job(struct thread_data *td) | |
97 | { | |
98 | if (td->o.flow) | |
99 | td->flow = flow_get(td->o.flow_id); | |
100 | } | |
101 | ||
102 | void flow_exit_job(struct thread_data *td) | |
103 | { | |
104 | if (td->flow) { | |
105 | flow_put(td->flow); | |
106 | td->flow = NULL; | |
107 | } | |
108 | } | |
109 | ||
110 | void flow_init(void) | |
111 | { | |
9e684a49 | 112 | flow_list = smalloc(sizeof(*flow_list)); |
fba5c5ff JA |
113 | if (!flow_list) { |
114 | log_err("fio: smalloc pool exhausted\n"); | |
115 | return; | |
116 | } | |
117 | ||
971caeb1 | 118 | flow_lock = fio_sem_init(FIO_SEM_UNLOCKED); |
fba5c5ff JA |
119 | if (!flow_lock) { |
120 | log_err("fio: failed to allocate flow lock\n"); | |
121 | sfree(flow_list); | |
122 | return; | |
123 | } | |
124 | ||
9e684a49 DE |
125 | INIT_FLIST_HEAD(flow_list); |
126 | } | |
127 | ||
128 | void flow_exit(void) | |
129 | { | |
fba5c5ff | 130 | if (flow_lock) |
971caeb1 | 131 | fio_sem_remove(flow_lock); |
fba5c5ff JA |
132 | if (flow_list) |
133 | sfree(flow_list); | |
9e684a49 | 134 | } |