Commit | Line | Data |
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a9da8ab2 JA |
1 | /* |
2 | * Rated submission helpers | |
3 | * | |
4 | * Copyright (C) 2015 Jens Axboe <axboe@kernel.dk> | |
5 | * | |
6 | */ | |
7 | #include <unistd.h> | |
8 | ||
9 | #include "fio.h" | |
a9da8ab2 JA |
10 | #include "flist.h" |
11 | #include "workqueue.h" | |
12 | #include "lib/getrusage.h" | |
13 | ||
a9da8ab2 JA |
14 | enum { |
15 | SW_F_IDLE = 1 << 0, | |
16 | SW_F_RUNNING = 1 << 1, | |
17 | SW_F_EXIT = 1 << 2, | |
18 | SW_F_EXITED = 1 << 3, | |
19 | SW_F_ACCOUNTED = 1 << 4, | |
20 | SW_F_ERROR = 1 << 5, | |
21 | }; | |
22 | ||
23 | static struct submit_worker *__get_submit_worker(struct workqueue *wq, | |
24 | unsigned int start, | |
25 | unsigned int end, | |
26 | struct submit_worker **best) | |
27 | { | |
28 | struct submit_worker *sw = NULL; | |
29 | ||
30 | while (start <= end) { | |
31 | sw = &wq->workers[start]; | |
32 | if (sw->flags & SW_F_IDLE) | |
33 | return sw; | |
34 | if (!(*best) || sw->seq < (*best)->seq) | |
35 | *best = sw; | |
36 | start++; | |
37 | } | |
38 | ||
39 | return NULL; | |
40 | } | |
41 | ||
42 | static struct submit_worker *get_submit_worker(struct workqueue *wq) | |
43 | { | |
44 | unsigned int next = wq->next_free_worker; | |
45 | struct submit_worker *sw, *best = NULL; | |
46 | ||
47 | assert(next < wq->max_workers); | |
48 | ||
49 | sw = __get_submit_worker(wq, next, wq->max_workers - 1, &best); | |
50 | if (!sw && next) | |
51 | sw = __get_submit_worker(wq, 0, next - 1, &best); | |
52 | ||
53 | /* | |
54 | * No truly idle found, use best match | |
55 | */ | |
56 | if (!sw) | |
57 | sw = best; | |
58 | ||
59 | if (sw->index == wq->next_free_worker) { | |
60 | if (sw->index + 1 < wq->max_workers) | |
61 | wq->next_free_worker = sw->index + 1; | |
62 | else | |
63 | wq->next_free_worker = 0; | |
64 | } | |
65 | ||
66 | return sw; | |
67 | } | |
68 | ||
1391052a | 69 | static bool all_sw_idle(struct workqueue *wq) |
a9da8ab2 JA |
70 | { |
71 | int i; | |
72 | ||
73 | for (i = 0; i < wq->max_workers; i++) { | |
74 | struct submit_worker *sw = &wq->workers[i]; | |
75 | ||
76 | if (!(sw->flags & SW_F_IDLE)) | |
1391052a | 77 | return false; |
a9da8ab2 JA |
78 | } |
79 | ||
1391052a | 80 | return true; |
a9da8ab2 JA |
81 | } |
82 | ||
83 | /* | |
84 | * Must be serialized wrt workqueue_enqueue() by caller | |
85 | */ | |
86 | void workqueue_flush(struct workqueue *wq) | |
87 | { | |
88 | wq->wake_idle = 1; | |
89 | ||
90 | while (!all_sw_idle(wq)) { | |
91 | pthread_mutex_lock(&wq->flush_lock); | |
92 | pthread_cond_wait(&wq->flush_cond, &wq->flush_lock); | |
93 | pthread_mutex_unlock(&wq->flush_lock); | |
94 | } | |
95 | ||
96 | wq->wake_idle = 0; | |
97 | } | |
98 | ||
99 | /* | |
b07f6ad1 | 100 | * Must be serialized by caller. Returns true for queued, false for busy. |
a9da8ab2 | 101 | */ |
88271841 | 102 | bool workqueue_enqueue(struct workqueue *wq, struct workqueue_work *work) |
a9da8ab2 JA |
103 | { |
104 | struct submit_worker *sw; | |
105 | ||
106 | sw = get_submit_worker(wq); | |
107 | if (sw) { | |
a9da8ab2 | 108 | pthread_mutex_lock(&sw->lock); |
88271841 | 109 | flist_add_tail(&work->list, &sw->work_list); |
a9da8ab2 JA |
110 | sw->seq = ++wq->work_seq; |
111 | sw->flags &= ~SW_F_IDLE; | |
112 | pthread_mutex_unlock(&sw->lock); | |
113 | ||
114 | pthread_cond_signal(&sw->cond); | |
b07f6ad1 | 115 | return true; |
a9da8ab2 JA |
116 | } |
117 | ||
b07f6ad1 | 118 | return false; |
a9da8ab2 JA |
119 | } |
120 | ||
121 | static void handle_list(struct submit_worker *sw, struct flist_head *list) | |
122 | { | |
123 | struct workqueue *wq = sw->wq; | |
88271841 | 124 | struct workqueue_work *work; |
a9da8ab2 JA |
125 | |
126 | while (!flist_empty(list)) { | |
88271841 JA |
127 | work = flist_first_entry(list, struct workqueue_work, list); |
128 | flist_del_init(&work->list); | |
ee2b6d6e | 129 | wq->ops.fn(sw, work); |
a9da8ab2 JA |
130 | } |
131 | } | |
132 | ||
a9da8ab2 JA |
133 | static void *worker_thread(void *data) |
134 | { | |
135 | struct submit_worker *sw = data; | |
136 | struct workqueue *wq = sw->wq; | |
a9da8ab2 JA |
137 | unsigned int eflags = 0, ret; |
138 | FLIST_HEAD(local_list); | |
139 | ||
80ea26a8 | 140 | ret = workqueue_init_worker(sw); |
a9da8ab2 JA |
141 | pthread_mutex_lock(&sw->lock); |
142 | sw->flags |= SW_F_RUNNING; | |
143 | if (ret) | |
144 | sw->flags |= SW_F_ERROR; | |
145 | pthread_mutex_unlock(&sw->lock); | |
146 | ||
147 | pthread_mutex_lock(&wq->flush_lock); | |
148 | pthread_cond_signal(&wq->flush_cond); | |
149 | pthread_mutex_unlock(&wq->flush_lock); | |
150 | ||
151 | if (sw->flags & SW_F_ERROR) | |
152 | goto done; | |
153 | ||
154 | while (1) { | |
155 | pthread_mutex_lock(&sw->lock); | |
156 | ||
157 | if (flist_empty(&sw->work_list)) { | |
158 | if (sw->flags & SW_F_EXIT) { | |
159 | pthread_mutex_unlock(&sw->lock); | |
160 | break; | |
161 | } | |
162 | ||
ee2b6d6e | 163 | if (workqueue_pre_sleep_check(sw)) { |
a9da8ab2 | 164 | pthread_mutex_unlock(&sw->lock); |
ee2b6d6e | 165 | workqueue_pre_sleep(sw); |
a9da8ab2 JA |
166 | pthread_mutex_lock(&sw->lock); |
167 | } | |
168 | ||
169 | /* | |
170 | * We dropped and reaquired the lock, check | |
171 | * state again. | |
172 | */ | |
173 | if (!flist_empty(&sw->work_list)) | |
174 | goto handle_work; | |
175 | ||
176 | if (sw->flags & SW_F_EXIT) { | |
177 | pthread_mutex_unlock(&sw->lock); | |
178 | break; | |
179 | } else if (!(sw->flags & SW_F_IDLE)) { | |
180 | sw->flags |= SW_F_IDLE; | |
181 | wq->next_free_worker = sw->index; | |
182 | if (wq->wake_idle) | |
183 | pthread_cond_signal(&wq->flush_cond); | |
184 | } | |
17ecadc3 JA |
185 | if (wq->ops.update_acct_fn) |
186 | wq->ops.update_acct_fn(sw); | |
187 | ||
a9da8ab2 JA |
188 | pthread_cond_wait(&sw->cond, &sw->lock); |
189 | } else { | |
190 | handle_work: | |
191 | flist_splice_init(&sw->work_list, &local_list); | |
192 | } | |
193 | pthread_mutex_unlock(&sw->lock); | |
194 | handle_list(sw, &local_list); | |
195 | } | |
196 | ||
17ecadc3 JA |
197 | if (wq->ops.update_acct_fn) |
198 | wq->ops.update_acct_fn(sw); | |
a9da8ab2 JA |
199 | |
200 | done: | |
201 | pthread_mutex_lock(&sw->lock); | |
202 | sw->flags |= (SW_F_EXITED | eflags); | |
203 | pthread_mutex_unlock(&sw->lock); | |
204 | return NULL; | |
205 | } | |
206 | ||
c35c582d | 207 | static void free_worker(struct submit_worker *sw, unsigned int *sum_cnt) |
a9da8ab2 | 208 | { |
ee2b6d6e | 209 | struct workqueue *wq = sw->wq; |
a9da8ab2 | 210 | |
c35c582d | 211 | workqueue_exit_worker(sw, sum_cnt); |
a9da8ab2 JA |
212 | |
213 | pthread_cond_destroy(&sw->cond); | |
214 | pthread_mutex_destroy(&sw->lock); | |
ee2b6d6e JA |
215 | |
216 | if (wq->ops.free_worker_fn) | |
217 | wq->ops.free_worker_fn(sw); | |
a9da8ab2 JA |
218 | } |
219 | ||
220 | static void shutdown_worker(struct submit_worker *sw, unsigned int *sum_cnt) | |
221 | { | |
a9da8ab2 | 222 | pthread_join(sw->thread, NULL); |
c35c582d | 223 | free_worker(sw, sum_cnt); |
a9da8ab2 JA |
224 | } |
225 | ||
226 | void workqueue_exit(struct workqueue *wq) | |
227 | { | |
228 | unsigned int shutdown, sum_cnt = 0; | |
229 | struct submit_worker *sw; | |
230 | int i; | |
231 | ||
232 | for (i = 0; i < wq->max_workers; i++) { | |
233 | sw = &wq->workers[i]; | |
234 | ||
235 | pthread_mutex_lock(&sw->lock); | |
236 | sw->flags |= SW_F_EXIT; | |
237 | pthread_cond_signal(&sw->cond); | |
238 | pthread_mutex_unlock(&sw->lock); | |
239 | } | |
240 | ||
241 | do { | |
242 | shutdown = 0; | |
243 | for (i = 0; i < wq->max_workers; i++) { | |
244 | sw = &wq->workers[i]; | |
245 | if (sw->flags & SW_F_ACCOUNTED) | |
246 | continue; | |
b7d0bbf1 | 247 | pthread_mutex_lock(&sw->lock); |
a9da8ab2 | 248 | sw->flags |= SW_F_ACCOUNTED; |
b7d0bbf1 | 249 | pthread_mutex_unlock(&sw->lock); |
a9da8ab2 JA |
250 | shutdown_worker(sw, &sum_cnt); |
251 | shutdown++; | |
252 | } | |
253 | } while (shutdown && shutdown != wq->max_workers); | |
254 | ||
255 | free(wq->workers); | |
256 | pthread_mutex_destroy(&wq->flush_lock); | |
257 | pthread_cond_destroy(&wq->flush_cond); | |
2a274336 | 258 | pthread_mutex_destroy(&wq->stat_lock); |
a9da8ab2 JA |
259 | } |
260 | ||
261 | static int start_worker(struct workqueue *wq, unsigned int index) | |
262 | { | |
263 | struct submit_worker *sw = &wq->workers[index]; | |
264 | int ret; | |
265 | ||
266 | INIT_FLIST_HEAD(&sw->work_list); | |
267 | pthread_cond_init(&sw->cond, NULL); | |
268 | pthread_mutex_init(&sw->lock, NULL); | |
269 | sw->wq = wq; | |
270 | sw->index = index; | |
271 | ||
ee2b6d6e JA |
272 | if (wq->ops.alloc_worker_fn) { |
273 | ret = wq->ops.alloc_worker_fn(sw); | |
274 | if (ret) | |
275 | return ret; | |
276 | } | |
277 | ||
a9da8ab2 JA |
278 | ret = pthread_create(&sw->thread, NULL, worker_thread, sw); |
279 | if (!ret) { | |
280 | pthread_mutex_lock(&sw->lock); | |
281 | sw->flags = SW_F_IDLE; | |
282 | pthread_mutex_unlock(&sw->lock); | |
283 | return 0; | |
284 | } | |
285 | ||
c35c582d | 286 | free_worker(sw, NULL); |
a9da8ab2 JA |
287 | return 1; |
288 | } | |
289 | ||
290 | int workqueue_init(struct thread_data *td, struct workqueue *wq, | |
5bb79f69 | 291 | struct workqueue_ops *ops, unsigned max_pending) |
a9da8ab2 JA |
292 | { |
293 | unsigned int running; | |
294 | int i, error; | |
295 | ||
296 | wq->max_workers = max_pending; | |
297 | wq->td = td; | |
5bb79f69 | 298 | wq->ops = *ops; |
a9da8ab2 JA |
299 | wq->work_seq = 0; |
300 | wq->next_free_worker = 0; | |
301 | pthread_cond_init(&wq->flush_cond, NULL); | |
302 | pthread_mutex_init(&wq->flush_lock, NULL); | |
2a274336 | 303 | pthread_mutex_init(&wq->stat_lock, NULL); |
a9da8ab2 JA |
304 | |
305 | wq->workers = calloc(wq->max_workers, sizeof(struct submit_worker)); | |
306 | ||
307 | for (i = 0; i < wq->max_workers; i++) | |
308 | if (start_worker(wq, i)) | |
309 | break; | |
310 | ||
311 | wq->max_workers = i; | |
bddc8d16 JA |
312 | if (!wq->max_workers) |
313 | goto err; | |
a9da8ab2 JA |
314 | |
315 | /* | |
316 | * Wait for them all to be started and initialized | |
317 | */ | |
318 | error = 0; | |
319 | do { | |
320 | struct submit_worker *sw; | |
321 | ||
322 | running = 0; | |
323 | pthread_mutex_lock(&wq->flush_lock); | |
324 | for (i = 0; i < wq->max_workers; i++) { | |
325 | sw = &wq->workers[i]; | |
326 | pthread_mutex_lock(&sw->lock); | |
327 | if (sw->flags & SW_F_RUNNING) | |
328 | running++; | |
329 | if (sw->flags & SW_F_ERROR) | |
330 | error++; | |
331 | pthread_mutex_unlock(&sw->lock); | |
332 | } | |
333 | ||
334 | if (error || running == wq->max_workers) { | |
335 | pthread_mutex_unlock(&wq->flush_lock); | |
336 | break; | |
337 | } | |
338 | ||
339 | pthread_cond_wait(&wq->flush_cond, &wq->flush_lock); | |
340 | pthread_mutex_unlock(&wq->flush_lock); | |
341 | } while (1); | |
342 | ||
bddc8d16 JA |
343 | if (!error) |
344 | return 0; | |
a9da8ab2 | 345 | |
bddc8d16 JA |
346 | err: |
347 | log_err("Can't create rate workqueue\n"); | |
348 | td_verror(td, ESRCH, "workqueue_init"); | |
349 | workqueue_exit(wq); | |
350 | return 1; | |
a9da8ab2 | 351 | } |