genfio: Splitting gen_template in 2 parts
[fio.git] / flow.c
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1#include "fio.h"
2#include "mutex.h"
3#include "smalloc.h"
4#include "flist.h"
5
6struct fio_flow {
7 unsigned int refs;
8 struct flist_head list;
9 unsigned int id;
10 long long int flow_counter;
11};
12
13static struct flist_head *flow_list;
14static struct fio_mutex *flow_lock;
15
16int 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) {
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26 if (td->o.flow_sleep) {
27 io_u_quiesce(td);
9e684a49 28 usleep(td->o.flow_sleep);
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29 }
30
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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
40static struct fio_flow *flow_get(unsigned int id)
41{
8e8b225d 42 struct fio_flow *flow = NULL;
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43 struct flist_head *n;
44
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45 if (!flow_lock)
46 return NULL;
47
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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));
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60 if (!flow) {
61 log_err("fio: smalloc pool exhausted\n");
62 return NULL;
63 }
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64 flow->refs = 0;
65 INIT_FLIST_HEAD(&flow->list);
66 flow->id = id;
67 flow->flow_counter = 0;
68
69 flist_add_tail(&flow->list, flow_list);
70 }
71
72 flow->refs++;
73 fio_mutex_up(flow_lock);
74 return flow;
75}
76
77static void flow_put(struct fio_flow *flow)
78{
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79 if (!flow_lock)
80 return;
81
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82 fio_mutex_down(flow_lock);
83
84 if (!--flow->refs) {
85 flist_del(&flow->list);
86 sfree(flow);
87 }
88
89 fio_mutex_up(flow_lock);
90}
91
92void flow_init_job(struct thread_data *td)
93{
94 if (td->o.flow)
95 td->flow = flow_get(td->o.flow_id);
96}
97
98void flow_exit_job(struct thread_data *td)
99{
100 if (td->flow) {
101 flow_put(td->flow);
102 td->flow = NULL;
103 }
104}
105
106void flow_init(void)
107{
9e684a49 108 flow_list = smalloc(sizeof(*flow_list));
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109 if (!flow_list) {
110 log_err("fio: smalloc pool exhausted\n");
111 return;
112 }
113
114 flow_lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
115 if (!flow_lock) {
116 log_err("fio: failed to allocate flow lock\n");
117 sfree(flow_list);
118 return;
119 }
120
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121 INIT_FLIST_HEAD(flow_list);
122}
123
124void flow_exit(void)
125{
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126 if (flow_lock)
127 fio_mutex_remove(flow_lock);
128 if (flow_list)
129 sfree(flow_list);
9e684a49 130}