Commit | Line | Data |
---|---|---|
a4f4fdd7 | 1 | /* |
da751ca9 JA |
2 | * syslet engine |
3 | * | |
4 | * IO engine that does regular pread(2)/pwrite(2) to transfer data, but | |
5 | * with syslets to make the execution async. | |
a4f4fdd7 JA |
6 | * |
7 | */ | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <unistd.h> | |
11 | #include <errno.h> | |
12 | #include <assert.h> | |
b8846354 | 13 | #include <asm/unistd.h> |
a4f4fdd7 JA |
14 | |
15 | #include "../fio.h" | |
a4f4fdd7 JA |
16 | |
17 | #ifdef FIO_HAVE_SYSLET | |
18 | ||
1760e679 JA |
19 | #ifdef __NR_pread64 |
20 | #define __NR_fio_pread __NR_pread64 | |
21 | #define __NR_fio_pwrite __NR_pwrite64 | |
22 | #else | |
23 | #define __NR_fio_pread __NR_pread | |
24 | #define __NR_fio_pwrite __NR_pwrite | |
25 | #endif | |
26 | ||
a4f4fdd7 JA |
27 | struct syslet_data { |
28 | struct io_u **events; | |
29 | unsigned int nr_events; | |
30 | ||
bf0dc8fa | 31 | struct async_head_user ahu; |
a4f4fdd7 | 32 | struct syslet_uatom **ring; |
9ff9de69 JA |
33 | |
34 | struct syslet_uatom *head, *tail; | |
a4f4fdd7 JA |
35 | }; |
36 | ||
9ff9de69 JA |
37 | static void fio_syslet_complete_atom(struct thread_data *td, |
38 | struct syslet_uatom *atom) | |
39 | { | |
40 | struct syslet_data *sd = td->io_ops->data; | |
5b38ee84 | 41 | struct syslet_uatom *last; |
9ff9de69 | 42 | struct io_u *io_u; |
9ff9de69 JA |
43 | |
44 | /* | |
5b38ee84 JA |
45 | * complete from the beginning of the sequence up to (and |
46 | * including) this atom | |
9ff9de69 | 47 | */ |
5b38ee84 JA |
48 | last = atom; |
49 | io_u = atom->private; | |
50 | atom = io_u->req.head; | |
9ff9de69 JA |
51 | |
52 | /* | |
53 | * now complete in right order | |
54 | */ | |
5b38ee84 | 55 | do { |
9ff9de69 JA |
56 | long ret; |
57 | ||
9ff9de69 JA |
58 | io_u = atom->private; |
59 | ret = *atom->ret_ptr; | |
e2e67912 | 60 | if (ret >= 0) |
9ff9de69 JA |
61 | io_u->resid = io_u->xfer_buflen - ret; |
62 | else if (ret < 0) | |
63 | io_u->error = ret; | |
64 | ||
2dc1bbeb | 65 | assert(sd->nr_events < td->o.iodepth); |
9ff9de69 | 66 | sd->events[sd->nr_events++] = io_u; |
9ff9de69 | 67 | |
5b38ee84 JA |
68 | if (atom == last) |
69 | break; | |
9ff9de69 | 70 | |
5b38ee84 JA |
71 | atom = atom->next; |
72 | } while (1); | |
73 | ||
74 | assert(!last->next); | |
9ff9de69 JA |
75 | } |
76 | ||
a4f4fdd7 JA |
77 | /* |
78 | * Inspect the ring to see if we have completed events | |
79 | */ | |
80 | static void fio_syslet_complete(struct thread_data *td) | |
81 | { | |
82 | struct syslet_data *sd = td->io_ops->data; | |
83 | ||
84 | do { | |
85 | struct syslet_uatom *atom; | |
a4f4fdd7 | 86 | |
bf0dc8fa | 87 | atom = sd->ring[sd->ahu.user_ring_idx]; |
a4f4fdd7 JA |
88 | if (!atom) |
89 | break; | |
90 | ||
bf0dc8fa | 91 | sd->ring[sd->ahu.user_ring_idx] = NULL; |
2dc1bbeb | 92 | if (++sd->ahu.user_ring_idx == td->o.iodepth) |
bf0dc8fa | 93 | sd->ahu.user_ring_idx = 0; |
a4f4fdd7 | 94 | |
9ff9de69 | 95 | fio_syslet_complete_atom(td, atom); |
a4f4fdd7 JA |
96 | } while (1); |
97 | } | |
98 | ||
99 | static int fio_syslet_getevents(struct thread_data *td, int min, | |
100 | int fio_unused max, | |
101 | struct timespec fio_unused *t) | |
102 | { | |
103 | struct syslet_data *sd = td->io_ops->data; | |
a4f4fdd7 JA |
104 | long ret; |
105 | ||
106 | do { | |
107 | fio_syslet_complete(td); | |
108 | ||
109 | /* | |
110 | * do we have enough immediate completions? | |
111 | */ | |
112 | if (sd->nr_events >= (unsigned int) min) | |
113 | break; | |
114 | ||
115 | /* | |
116 | * OK, we need to wait for some events... | |
117 | */ | |
9ff9de69 | 118 | ret = async_wait(1, sd->ahu.user_ring_idx, &sd->ahu); |
a4f4fdd7 | 119 | if (ret < 0) |
e49499f8 | 120 | return -errno; |
a4f4fdd7 JA |
121 | } while (1); |
122 | ||
123 | ret = sd->nr_events; | |
124 | sd->nr_events = 0; | |
125 | return ret; | |
126 | } | |
127 | ||
128 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
129 | { | |
130 | struct syslet_data *sd = td->io_ops->data; | |
131 | ||
132 | return sd->events[event]; | |
133 | } | |
134 | ||
135 | static void init_atom(struct syslet_uatom *atom, int nr, void *arg0, | |
a2e1b08a JA |
136 | void *arg1, void *arg2, void *arg3, void *ret_ptr, |
137 | unsigned long flags, void *priv) | |
a4f4fdd7 JA |
138 | { |
139 | atom->flags = flags; | |
140 | atom->nr = nr; | |
141 | atom->ret_ptr = ret_ptr; | |
a2e1b08a | 142 | atom->next = NULL; |
a4f4fdd7 JA |
143 | atom->arg_ptr[0] = arg0; |
144 | atom->arg_ptr[1] = arg1; | |
145 | atom->arg_ptr[2] = arg2; | |
a2e1b08a JA |
146 | atom->arg_ptr[3] = arg3; |
147 | atom->arg_ptr[4] = atom->arg_ptr[5] = NULL; | |
a4f4fdd7 JA |
148 | atom->private = priv; |
149 | } | |
150 | ||
151 | /* | |
152 | * Use seek atom for sync | |
153 | */ | |
154 | static void fio_syslet_prep_sync(struct io_u *io_u, struct fio_file *f) | |
155 | { | |
a2e1b08a | 156 | init_atom(&io_u->req.atom, __NR_fsync, &f->fd, NULL, NULL, NULL, |
7d44a745 | 157 | &io_u->req.ret, 0, io_u); |
a4f4fdd7 JA |
158 | } |
159 | ||
160 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f) | |
161 | { | |
162 | int nr; | |
163 | ||
a4f4fdd7 JA |
164 | /* |
165 | * prepare rw | |
166 | */ | |
167 | if (io_u->ddir == DDIR_READ) | |
1760e679 | 168 | nr = __NR_fio_pread; |
a4f4fdd7 | 169 | else |
1760e679 | 170 | nr = __NR_fio_pwrite; |
a4f4fdd7 | 171 | |
a2e1b08a | 172 | init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf, |
7d44a745 | 173 | &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, 0, io_u); |
a4f4fdd7 JA |
174 | } |
175 | ||
176 | static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u) | |
177 | { | |
178 | struct fio_file *f = io_u->file; | |
179 | ||
180 | if (io_u->ddir == DDIR_SYNC) | |
181 | fio_syslet_prep_sync(io_u, f); | |
182 | else | |
183 | fio_syslet_prep_rw(io_u, f); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
bf0dc8fa IM |
188 | static void cachemiss_thread_start(void) |
189 | { | |
190 | while (1) | |
7756b0d0 | 191 | async_thread(NULL, NULL); |
bf0dc8fa IM |
192 | } |
193 | ||
194 | #define THREAD_STACK_SIZE (16384) | |
195 | ||
196 | static unsigned long thread_stack_alloc() | |
197 | { | |
5b38ee84 | 198 | return (unsigned long) malloc(THREAD_STACK_SIZE) + THREAD_STACK_SIZE; |
bf0dc8fa IM |
199 | } |
200 | ||
a0a930ef JA |
201 | static void fio_syslet_queued(struct thread_data *td, struct syslet_data *sd) |
202 | { | |
203 | struct syslet_uatom *atom; | |
204 | struct timeval now; | |
205 | ||
206 | fio_gettime(&now, NULL); | |
207 | ||
208 | atom = sd->head; | |
209 | while (atom) { | |
210 | struct io_u *io_u = atom->private; | |
211 | ||
212 | memcpy(&io_u->issue_time, &now, sizeof(now)); | |
213 | io_u_queued(td, io_u); | |
214 | atom = atom->next; | |
215 | } | |
216 | } | |
217 | ||
9ff9de69 | 218 | static int fio_syslet_commit(struct thread_data *td) |
a4f4fdd7 JA |
219 | { |
220 | struct syslet_data *sd = td->io_ops->data; | |
bf0dc8fa | 221 | struct syslet_uatom *done; |
9ff9de69 JA |
222 | |
223 | if (!sd->head) | |
224 | return 0; | |
a4f4fdd7 | 225 | |
5b38ee84 JA |
226 | assert(!sd->tail->next); |
227 | ||
bf0dc8fa IM |
228 | if (!sd->ahu.new_thread_stack) |
229 | sd->ahu.new_thread_stack = thread_stack_alloc(); | |
230 | ||
a0a930ef JA |
231 | fio_syslet_queued(td, sd); |
232 | ||
7d44a745 JA |
233 | /* |
234 | * On sync completion, the atom is returned. So on NULL return | |
235 | * it's queued asynchronously. | |
236 | */ | |
9ff9de69 | 237 | done = async_exec(sd->head, &sd->ahu); |
bf0dc8fa | 238 | |
76f58b92 JA |
239 | if (done == (void *) -1) { |
240 | log_err("fio: syslets don't appear to work\n"); | |
241 | return -1; | |
242 | } | |
243 | ||
9ff9de69 | 244 | sd->head = sd->tail = NULL; |
a4f4fdd7 | 245 | |
9ff9de69 JA |
246 | if (done) |
247 | fio_syslet_complete_atom(td, done); | |
a4f4fdd7 | 248 | |
9ff9de69 JA |
249 | return 0; |
250 | } | |
251 | ||
252 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
253 | { | |
254 | struct syslet_data *sd = td->io_ops->data; | |
bf0dc8fa | 255 | |
9ff9de69 JA |
256 | if (sd->tail) { |
257 | sd->tail->next = &io_u->req.atom; | |
258 | sd->tail = &io_u->req.atom; | |
259 | } else | |
260 | sd->head = sd->tail = &io_u->req.atom; | |
a4f4fdd7 | 261 | |
5b38ee84 | 262 | io_u->req.head = sd->head; |
9ff9de69 | 263 | return FIO_Q_QUEUED; |
a4f4fdd7 JA |
264 | } |
265 | ||
db64e9bc | 266 | static int async_head_init(struct syslet_data *sd, unsigned int depth) |
a4f4fdd7 | 267 | { |
a4f4fdd7 JA |
268 | unsigned long ring_size; |
269 | ||
bf0dc8fa | 270 | memset(&sd->ahu, 0, sizeof(struct async_head_user)); |
2ca50be4 | 271 | |
a4f4fdd7 JA |
272 | ring_size = sizeof(struct syslet_uatom *) * depth; |
273 | sd->ring = malloc(ring_size); | |
274 | memset(sd->ring, 0, ring_size); | |
275 | ||
bf0dc8fa IM |
276 | sd->ahu.user_ring_idx = 0; |
277 | sd->ahu.completion_ring = sd->ring; | |
278 | sd->ahu.ring_size_bytes = ring_size; | |
279 | sd->ahu.head_stack = thread_stack_alloc(); | |
5b38ee84 JA |
280 | sd->ahu.head_eip = (unsigned long) cachemiss_thread_start; |
281 | sd->ahu.new_thread_eip = (unsigned long) cachemiss_thread_start; | |
db64e9bc JA |
282 | |
283 | return 0; | |
a4f4fdd7 JA |
284 | } |
285 | ||
2ca50be4 | 286 | static void async_head_exit(struct syslet_data *sd) |
a4f4fdd7 | 287 | { |
7f059a76 | 288 | free(sd->ring); |
a4f4fdd7 JA |
289 | } |
290 | ||
76f58b92 JA |
291 | static int check_syslet_support(struct syslet_data *sd) |
292 | { | |
293 | struct syslet_uatom atom; | |
294 | void *ret; | |
295 | ||
296 | init_atom(&atom, __NR_getpid, NULL, NULL, NULL, NULL, NULL, 0, NULL); | |
297 | ret = async_exec(sd->head, &sd->ahu); | |
298 | if (ret == (void *) -1) | |
299 | return 1; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
a4f4fdd7 JA |
304 | static void fio_syslet_cleanup(struct thread_data *td) |
305 | { | |
306 | struct syslet_data *sd = td->io_ops->data; | |
307 | ||
308 | if (sd) { | |
2ca50be4 | 309 | async_head_exit(sd); |
a4f4fdd7 JA |
310 | free(sd->events); |
311 | free(sd); | |
312 | td->io_ops->data = NULL; | |
313 | } | |
314 | } | |
315 | ||
316 | static int fio_syslet_init(struct thread_data *td) | |
317 | { | |
318 | struct syslet_data *sd; | |
319 | ||
320 | sd = malloc(sizeof(*sd)); | |
321 | memset(sd, 0, sizeof(*sd)); | |
2dc1bbeb JA |
322 | sd->events = malloc(sizeof(struct io_u *) * td->o.iodepth); |
323 | memset(sd->events, 0, sizeof(struct io_u *) * td->o.iodepth); | |
db64e9bc JA |
324 | |
325 | /* | |
326 | * This will handily fail for kernels where syslet isn't available | |
327 | */ | |
2dc1bbeb | 328 | if (async_head_init(sd, td->o.iodepth)) { |
db64e9bc JA |
329 | free(sd->events); |
330 | free(sd); | |
331 | return 1; | |
332 | } | |
333 | ||
76f58b92 JA |
334 | if (check_syslet_support(sd)) { |
335 | log_err("fio: syslets do not appear to work\n"); | |
336 | free(sd->events); | |
337 | free(sd); | |
338 | return 1; | |
339 | } | |
340 | ||
a4f4fdd7 | 341 | td->io_ops->data = sd; |
a4f4fdd7 JA |
342 | return 0; |
343 | } | |
344 | ||
345 | static struct ioengine_ops ioengine = { | |
346 | .name = "syslet-rw", | |
347 | .version = FIO_IOOPS_VERSION, | |
348 | .init = fio_syslet_init, | |
349 | .prep = fio_syslet_prep, | |
350 | .queue = fio_syslet_queue, | |
9ff9de69 | 351 | .commit = fio_syslet_commit, |
a4f4fdd7 JA |
352 | .getevents = fio_syslet_getevents, |
353 | .event = fio_syslet_event, | |
354 | .cleanup = fio_syslet_cleanup, | |
b5af8293 JA |
355 | .open_file = generic_open_file, |
356 | .close_file = generic_close_file, | |
a4f4fdd7 JA |
357 | }; |
358 | ||
359 | #else /* FIO_HAVE_SYSLET */ | |
360 | ||
361 | /* | |
362 | * When we have a proper configure system in place, we simply wont build | |
363 | * and install this io engine. For now install a crippled version that | |
364 | * just complains and fails to load. | |
365 | */ | |
366 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
367 | { | |
368 | fprintf(stderr, "fio: syslet not available\n"); | |
369 | return 1; | |
370 | } | |
371 | ||
372 | static struct ioengine_ops ioengine = { | |
373 | .name = "syslet-rw", | |
374 | .version = FIO_IOOPS_VERSION, | |
375 | .init = fio_syslet_init, | |
376 | }; | |
377 | ||
378 | #endif /* FIO_HAVE_SYSLET */ | |
379 | ||
380 | static void fio_init fio_syslet_register(void) | |
381 | { | |
382 | register_ioengine(&ioengine); | |
383 | } | |
384 | ||
385 | static void fio_exit fio_syslet_unregister(void) | |
386 | { | |
387 | unregister_ioengine(&ioengine); | |
388 | } |