1 /*
2 * Rated submission helpers
3 *
4 * Copyright (C) 2015 Jens Axboe <axboe@kernel.dk>
5 *
6 */
7 #include <assert.h>
8 #include "fio.h"
9 #include "ioengines.h"
10 #include "lib/getrusage.h"
11 #include "rate-submit.h"
12
check_overlap(struct io_u * io_u)13 static void check_overlap(struct io_u *io_u)
14 {
15 int i, res;
16 struct thread_data *td;
17
18 /*
19 * Allow only one thread to check for overlap at a time to prevent two
20 * threads from thinking the coast is clear and then submitting IOs
21 * that overlap with each other.
22 *
23 * If an overlap is found, release the lock and re-acquire it before
24 * checking again to give other threads a chance to make progress.
25 *
26 * If no overlap is found, release the lock when the io_u's
27 * IO_U_F_FLIGHT flag is set so that this io_u can be checked by other
28 * threads as they assess overlap.
29 */
30 res = pthread_mutex_lock(&overlap_check);
31 assert(res == 0);
32
33 retry:
34 for_each_td(td, i) {
35 if (td->runstate <= TD_SETTING_UP ||
36 td->runstate >= TD_FINISHING ||
37 !td->o.serialize_overlap ||
38 td->o.io_submit_mode != IO_MODE_OFFLOAD)
39 continue;
40
41 if (!in_flight_overlap(&td->io_u_all, io_u))
42 continue;
43
44 res = pthread_mutex_unlock(&overlap_check);
45 assert(res == 0);
46 res = pthread_mutex_lock(&overlap_check);
47 assert(res == 0);
48 goto retry;
49 }
50 }
51
io_workqueue_fn(struct submit_worker * sw,struct workqueue_work * work)52 static int io_workqueue_fn(struct submit_worker *sw,
53 struct workqueue_work *work)
54 {
55 struct io_u *io_u = container_of(work, struct io_u, work);
56 const enum fio_ddir ddir = io_u->ddir;
57 struct thread_data *td = sw->priv;
58 int ret, error;
59
60 if (td->o.serialize_overlap)
61 check_overlap(io_u);
62
63 dprint(FD_RATE, "io_u %p queued by %u\n", io_u, gettid());
64
65 io_u_set(td, io_u, IO_U_F_NO_FILE_PUT);
66
67 td->cur_depth++;
68
69 do {
70 ret = td_io_queue(td, io_u);
71 if (ret != FIO_Q_BUSY)
72 break;
73 ret = io_u_queued_complete(td, 1);
74 if (ret > 0)
75 td->cur_depth -= ret;
76 else if (ret < 0)
77 break;
78 io_u_clear(td, io_u, IO_U_F_FLIGHT);
79 } while (1);
80
81 dprint(FD_RATE, "io_u %p ret %d by %u\n", io_u, ret, gettid());
82
83 error = io_queue_event(td, io_u, &ret, ddir, NULL, 0, NULL);
84
85 if (ret == FIO_Q_COMPLETED)
86 td->cur_depth--;
87 else if (ret == FIO_Q_QUEUED) {
88 unsigned int min_evts;
89
90 if (td->o.iodepth == 1)
91 min_evts = 1;
92 else
93 min_evts = 0;
94
95 ret = io_u_queued_complete(td, min_evts);
96 if (ret > 0)
97 td->cur_depth -= ret;
98 }
99
100 if (error || td->error) {
101 pthread_mutex_lock(&td->io_u_lock);
102 pthread_cond_signal(&td->parent->free_cond);
103 pthread_mutex_unlock(&td->io_u_lock);
104 }
105
106 return 0;
107 }
108
io_workqueue_pre_sleep_flush_fn(struct submit_worker * sw)109 static bool io_workqueue_pre_sleep_flush_fn(struct submit_worker *sw)
110 {
111 struct thread_data *td = sw->priv;
112
113 if (td->error)
114 return false;
115 if (td->io_u_queued || td->cur_depth || td->io_u_in_flight)
116 return true;
117
118 return false;
119 }
120
io_workqueue_pre_sleep_fn(struct submit_worker * sw)121 static void io_workqueue_pre_sleep_fn(struct submit_worker *sw)
122 {
123 struct thread_data *td = sw->priv;
124 int ret;
125
126 ret = io_u_quiesce(td);
127 if (ret > 0)
128 td->cur_depth -= ret;
129 }
130
io_workqueue_alloc_fn(struct submit_worker * sw)131 static int io_workqueue_alloc_fn(struct submit_worker *sw)
132 {
133 struct thread_data *td;
134
135 td = calloc(1, sizeof(*td));
136 sw->priv = td;
137 return 0;
138 }
139
io_workqueue_free_fn(struct submit_worker * sw)140 static void io_workqueue_free_fn(struct submit_worker *sw)
141 {
142 free(sw->priv);
143 sw->priv = NULL;
144 }
145
io_workqueue_init_worker_fn(struct submit_worker * sw)146 static int io_workqueue_init_worker_fn(struct submit_worker *sw)
147 {
148 struct thread_data *parent = sw->wq->td;
149 struct thread_data *td = sw->priv;
150
151 memcpy(&td->o, &parent->o, sizeof(td->o));
152 memcpy(&td->ts, &parent->ts, sizeof(td->ts));
153 td->o.uid = td->o.gid = -1U;
154 dup_files(td, parent);
155 td->eo = parent->eo;
156 fio_options_mem_dupe(td);
157
158 if (ioengine_load(td))
159 goto err;
160
161 td->pid = gettid();
162
163 INIT_FLIST_HEAD(&td->io_log_list);
164 INIT_FLIST_HEAD(&td->io_hist_list);
165 INIT_FLIST_HEAD(&td->verify_list);
166 INIT_FLIST_HEAD(&td->trim_list);
167 td->io_hist_tree = RB_ROOT;
168
169 td->o.iodepth = 1;
170 if (td_io_init(td))
171 goto err_io_init;
172
173 if (td->io_ops->post_init && td->io_ops->post_init(td))
174 goto err_io_init;
175
176 set_epoch_time(td, td->o.log_unix_epoch);
177 fio_getrusage(&td->ru_start);
178 clear_io_state(td, 1);
179
180 td_set_runstate(td, TD_RUNNING);
181 td->flags |= TD_F_CHILD | TD_F_NEED_LOCK;
182 td->parent = parent;
183 return 0;
184
185 err_io_init:
186 close_ioengine(td);
187 err:
188 return 1;
189
190 }
191
io_workqueue_exit_worker_fn(struct submit_worker * sw,unsigned int * sum_cnt)192 static void io_workqueue_exit_worker_fn(struct submit_worker *sw,
193 unsigned int *sum_cnt)
194 {
195 struct thread_data *td = sw->priv;
196
197 (*sum_cnt)++;
198 sum_thread_stats(&sw->wq->td->ts, &td->ts, *sum_cnt == 1);
199
200 fio_options_free(td);
201 close_and_free_files(td);
202 if (td->io_ops)
203 close_ioengine(td);
204 td_set_runstate(td, TD_EXITED);
205 }
206
207 #ifdef CONFIG_SFAA
sum_val(uint64_t * dst,uint64_t * src)208 static void sum_val(uint64_t *dst, uint64_t *src)
209 {
210 if (*src) {
211 __sync_fetch_and_add(dst, *src);
212 *src = 0;
213 }
214 }
215 #else
sum_val(uint64_t * dst,uint64_t * src)216 static void sum_val(uint64_t *dst, uint64_t *src)
217 {
218 if (*src) {
219 *dst += *src;
220 *src = 0;
221 }
222 }
223 #endif
224
pthread_double_unlock(pthread_mutex_t * lock1,pthread_mutex_t * lock2)225 static void pthread_double_unlock(pthread_mutex_t *lock1,
226 pthread_mutex_t *lock2)
227 {
228 #ifndef CONFIG_SFAA
229 pthread_mutex_unlock(lock1);
230 pthread_mutex_unlock(lock2);
231 #endif
232 }
233
pthread_double_lock(pthread_mutex_t * lock1,pthread_mutex_t * lock2)234 static void pthread_double_lock(pthread_mutex_t *lock1, pthread_mutex_t *lock2)
235 {
236 #ifndef CONFIG_SFAA
237 if (lock1 < lock2) {
238 pthread_mutex_lock(lock1);
239 pthread_mutex_lock(lock2);
240 } else {
241 pthread_mutex_lock(lock2);
242 pthread_mutex_lock(lock1);
243 }
244 #endif
245 }
246
sum_ddir(struct thread_data * dst,struct thread_data * src,enum fio_ddir ddir)247 static void sum_ddir(struct thread_data *dst, struct thread_data *src,
248 enum fio_ddir ddir)
249 {
250 pthread_double_lock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
251
252 sum_val(&dst->io_bytes[ddir], &src->io_bytes[ddir]);
253 sum_val(&dst->io_blocks[ddir], &src->io_blocks[ddir]);
254 sum_val(&dst->this_io_blocks[ddir], &src->this_io_blocks[ddir]);
255 sum_val(&dst->this_io_bytes[ddir], &src->this_io_bytes[ddir]);
256 sum_val(&dst->bytes_done[ddir], &src->bytes_done[ddir]);
257
258 pthread_double_unlock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
259 }
260
io_workqueue_update_acct_fn(struct submit_worker * sw)261 static void io_workqueue_update_acct_fn(struct submit_worker *sw)
262 {
263 struct thread_data *src = sw->priv;
264 struct thread_data *dst = sw->wq->td;
265
266 if (td_read(src))
267 sum_ddir(dst, src, DDIR_READ);
268 if (td_write(src))
269 sum_ddir(dst, src, DDIR_WRITE);
270 if (td_trim(src))
271 sum_ddir(dst, src, DDIR_TRIM);
272
273 }
274
275 static struct workqueue_ops rated_wq_ops = {
276 .fn = io_workqueue_fn,
277 .pre_sleep_flush_fn = io_workqueue_pre_sleep_flush_fn,
278 .pre_sleep_fn = io_workqueue_pre_sleep_fn,
279 .update_acct_fn = io_workqueue_update_acct_fn,
280 .alloc_worker_fn = io_workqueue_alloc_fn,
281 .free_worker_fn = io_workqueue_free_fn,
282 .init_worker_fn = io_workqueue_init_worker_fn,
283 .exit_worker_fn = io_workqueue_exit_worker_fn,
284 };
285
rate_submit_init(struct thread_data * td,struct sk_out * sk_out)286 int rate_submit_init(struct thread_data *td, struct sk_out *sk_out)
287 {
288 if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
289 return 0;
290
291 return workqueue_init(td, &td->io_wq, &rated_wq_ops, td->o.iodepth, sk_out);
292 }
293
rate_submit_exit(struct thread_data * td)294 void rate_submit_exit(struct thread_data *td)
295 {
296 if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
297 return;
298
299 workqueue_exit(&td->io_wq);
300 }
301