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" | |
16 | #include "../os.h" | |
17 | ||
18 | #ifdef FIO_HAVE_SYSLET | |
19 | ||
1760e679 JA |
20 | #ifdef __NR_pread64 |
21 | #define __NR_fio_pread __NR_pread64 | |
22 | #define __NR_fio_pwrite __NR_pwrite64 | |
23 | #else | |
24 | #define __NR_fio_pread __NR_pread | |
25 | #define __NR_fio_pwrite __NR_pwrite | |
26 | #endif | |
27 | ||
a4f4fdd7 JA |
28 | struct syslet_data { |
29 | struct io_u **events; | |
30 | unsigned int nr_events; | |
31 | ||
bf0dc8fa | 32 | struct async_head_user ahu; |
a4f4fdd7 | 33 | struct syslet_uatom **ring; |
9ff9de69 JA |
34 | |
35 | struct syslet_uatom *head, *tail; | |
a4f4fdd7 JA |
36 | }; |
37 | ||
9ff9de69 JA |
38 | static void fio_syslet_complete_atom(struct thread_data *td, |
39 | struct syslet_uatom *atom) | |
40 | { | |
41 | struct syslet_data *sd = td->io_ops->data; | |
5b38ee84 | 42 | struct syslet_uatom *last; |
9ff9de69 | 43 | struct io_u *io_u; |
9ff9de69 JA |
44 | |
45 | /* | |
5b38ee84 JA |
46 | * complete from the beginning of the sequence up to (and |
47 | * including) this atom | |
9ff9de69 | 48 | */ |
5b38ee84 JA |
49 | last = atom; |
50 | io_u = atom->private; | |
51 | atom = io_u->req.head; | |
9ff9de69 JA |
52 | |
53 | /* | |
54 | * now complete in right order | |
55 | */ | |
5b38ee84 | 56 | do { |
9ff9de69 JA |
57 | long ret; |
58 | ||
9ff9de69 JA |
59 | io_u = atom->private; |
60 | ret = *atom->ret_ptr; | |
e2e67912 | 61 | if (ret >= 0) |
9ff9de69 JA |
62 | io_u->resid = io_u->xfer_buflen - ret; |
63 | else if (ret < 0) | |
64 | io_u->error = ret; | |
65 | ||
2dc1bbeb | 66 | assert(sd->nr_events < td->o.iodepth); |
9ff9de69 | 67 | sd->events[sd->nr_events++] = io_u; |
9ff9de69 | 68 | |
5b38ee84 JA |
69 | if (atom == last) |
70 | break; | |
9ff9de69 | 71 | |
5b38ee84 JA |
72 | atom = atom->next; |
73 | } while (1); | |
74 | ||
75 | assert(!last->next); | |
9ff9de69 JA |
76 | } |
77 | ||
a4f4fdd7 JA |
78 | /* |
79 | * Inspect the ring to see if we have completed events | |
80 | */ | |
81 | static void fio_syslet_complete(struct thread_data *td) | |
82 | { | |
83 | struct syslet_data *sd = td->io_ops->data; | |
84 | ||
85 | do { | |
86 | struct syslet_uatom *atom; | |
a4f4fdd7 | 87 | |
bf0dc8fa | 88 | atom = sd->ring[sd->ahu.user_ring_idx]; |
a4f4fdd7 JA |
89 | if (!atom) |
90 | break; | |
91 | ||
bf0dc8fa | 92 | sd->ring[sd->ahu.user_ring_idx] = NULL; |
2dc1bbeb | 93 | if (++sd->ahu.user_ring_idx == td->o.iodepth) |
bf0dc8fa | 94 | sd->ahu.user_ring_idx = 0; |
a4f4fdd7 | 95 | |
9ff9de69 | 96 | fio_syslet_complete_atom(td, atom); |
a4f4fdd7 JA |
97 | } while (1); |
98 | } | |
99 | ||
100 | static int fio_syslet_getevents(struct thread_data *td, int min, | |
101 | int fio_unused max, | |
102 | struct timespec fio_unused *t) | |
103 | { | |
104 | struct syslet_data *sd = td->io_ops->data; | |
a4f4fdd7 JA |
105 | long ret; |
106 | ||
107 | do { | |
108 | fio_syslet_complete(td); | |
109 | ||
110 | /* | |
111 | * do we have enough immediate completions? | |
112 | */ | |
113 | if (sd->nr_events >= (unsigned int) min) | |
114 | break; | |
115 | ||
116 | /* | |
117 | * OK, we need to wait for some events... | |
118 | */ | |
9ff9de69 | 119 | ret = async_wait(1, sd->ahu.user_ring_idx, &sd->ahu); |
a4f4fdd7 | 120 | if (ret < 0) |
e49499f8 | 121 | return -errno; |
a4f4fdd7 JA |
122 | } while (1); |
123 | ||
124 | ret = sd->nr_events; | |
125 | sd->nr_events = 0; | |
126 | return ret; | |
127 | } | |
128 | ||
129 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
130 | { | |
131 | struct syslet_data *sd = td->io_ops->data; | |
132 | ||
133 | return sd->events[event]; | |
134 | } | |
135 | ||
136 | static void init_atom(struct syslet_uatom *atom, int nr, void *arg0, | |
a2e1b08a JA |
137 | void *arg1, void *arg2, void *arg3, void *ret_ptr, |
138 | unsigned long flags, void *priv) | |
a4f4fdd7 JA |
139 | { |
140 | atom->flags = flags; | |
141 | atom->nr = nr; | |
142 | atom->ret_ptr = ret_ptr; | |
a2e1b08a | 143 | atom->next = NULL; |
a4f4fdd7 JA |
144 | atom->arg_ptr[0] = arg0; |
145 | atom->arg_ptr[1] = arg1; | |
146 | atom->arg_ptr[2] = arg2; | |
a2e1b08a JA |
147 | atom->arg_ptr[3] = arg3; |
148 | atom->arg_ptr[4] = atom->arg_ptr[5] = NULL; | |
a4f4fdd7 JA |
149 | atom->private = priv; |
150 | } | |
151 | ||
152 | /* | |
153 | * Use seek atom for sync | |
154 | */ | |
155 | static void fio_syslet_prep_sync(struct io_u *io_u, struct fio_file *f) | |
156 | { | |
a2e1b08a | 157 | init_atom(&io_u->req.atom, __NR_fsync, &f->fd, NULL, NULL, NULL, |
7d44a745 | 158 | &io_u->req.ret, 0, io_u); |
a4f4fdd7 JA |
159 | } |
160 | ||
161 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f) | |
162 | { | |
163 | int nr; | |
164 | ||
a4f4fdd7 JA |
165 | /* |
166 | * prepare rw | |
167 | */ | |
168 | if (io_u->ddir == DDIR_READ) | |
1760e679 | 169 | nr = __NR_fio_pread; |
a4f4fdd7 | 170 | else |
1760e679 | 171 | nr = __NR_fio_pwrite; |
a4f4fdd7 | 172 | |
a2e1b08a | 173 | init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf, |
7d44a745 | 174 | &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, 0, io_u); |
a4f4fdd7 JA |
175 | } |
176 | ||
177 | static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u) | |
178 | { | |
179 | struct fio_file *f = io_u->file; | |
180 | ||
181 | if (io_u->ddir == DDIR_SYNC) | |
182 | fio_syslet_prep_sync(io_u, f); | |
183 | else | |
184 | fio_syslet_prep_rw(io_u, f); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
bf0dc8fa IM |
189 | static void cachemiss_thread_start(void) |
190 | { | |
191 | while (1) | |
7756b0d0 | 192 | async_thread(NULL, NULL); |
bf0dc8fa IM |
193 | } |
194 | ||
195 | #define THREAD_STACK_SIZE (16384) | |
196 | ||
197 | static unsigned long thread_stack_alloc() | |
198 | { | |
5b38ee84 | 199 | return (unsigned long) malloc(THREAD_STACK_SIZE) + THREAD_STACK_SIZE; |
bf0dc8fa IM |
200 | } |
201 | ||
a0a930ef JA |
202 | static void fio_syslet_queued(struct thread_data *td, struct syslet_data *sd) |
203 | { | |
204 | struct syslet_uatom *atom; | |
205 | struct timeval now; | |
206 | ||
207 | fio_gettime(&now, NULL); | |
208 | ||
209 | atom = sd->head; | |
210 | while (atom) { | |
211 | struct io_u *io_u = atom->private; | |
212 | ||
213 | memcpy(&io_u->issue_time, &now, sizeof(now)); | |
214 | io_u_queued(td, io_u); | |
215 | atom = atom->next; | |
216 | } | |
217 | } | |
218 | ||
9ff9de69 | 219 | static int fio_syslet_commit(struct thread_data *td) |
a4f4fdd7 JA |
220 | { |
221 | struct syslet_data *sd = td->io_ops->data; | |
bf0dc8fa | 222 | struct syslet_uatom *done; |
9ff9de69 JA |
223 | |
224 | if (!sd->head) | |
225 | return 0; | |
a4f4fdd7 | 226 | |
5b38ee84 JA |
227 | assert(!sd->tail->next); |
228 | ||
bf0dc8fa IM |
229 | if (!sd->ahu.new_thread_stack) |
230 | sd->ahu.new_thread_stack = thread_stack_alloc(); | |
231 | ||
a0a930ef JA |
232 | fio_syslet_queued(td, sd); |
233 | ||
7d44a745 JA |
234 | /* |
235 | * On sync completion, the atom is returned. So on NULL return | |
236 | * it's queued asynchronously. | |
237 | */ | |
9ff9de69 | 238 | done = async_exec(sd->head, &sd->ahu); |
bf0dc8fa | 239 | |
76f58b92 JA |
240 | if (done == (void *) -1) { |
241 | log_err("fio: syslets don't appear to work\n"); | |
242 | return -1; | |
243 | } | |
244 | ||
9ff9de69 | 245 | sd->head = sd->tail = NULL; |
a4f4fdd7 | 246 | |
9ff9de69 JA |
247 | if (done) |
248 | fio_syslet_complete_atom(td, done); | |
a4f4fdd7 | 249 | |
9ff9de69 JA |
250 | return 0; |
251 | } | |
252 | ||
253 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
254 | { | |
255 | struct syslet_data *sd = td->io_ops->data; | |
bf0dc8fa | 256 | |
9ff9de69 JA |
257 | if (sd->tail) { |
258 | sd->tail->next = &io_u->req.atom; | |
259 | sd->tail = &io_u->req.atom; | |
260 | } else | |
261 | sd->head = sd->tail = &io_u->req.atom; | |
a4f4fdd7 | 262 | |
5b38ee84 | 263 | io_u->req.head = sd->head; |
9ff9de69 | 264 | return FIO_Q_QUEUED; |
a4f4fdd7 JA |
265 | } |
266 | ||
db64e9bc | 267 | static int async_head_init(struct syslet_data *sd, unsigned int depth) |
a4f4fdd7 | 268 | { |
a4f4fdd7 JA |
269 | unsigned long ring_size; |
270 | ||
bf0dc8fa | 271 | memset(&sd->ahu, 0, sizeof(struct async_head_user)); |
2ca50be4 | 272 | |
a4f4fdd7 JA |
273 | ring_size = sizeof(struct syslet_uatom *) * depth; |
274 | sd->ring = malloc(ring_size); | |
275 | memset(sd->ring, 0, ring_size); | |
276 | ||
bf0dc8fa IM |
277 | sd->ahu.user_ring_idx = 0; |
278 | sd->ahu.completion_ring = sd->ring; | |
279 | sd->ahu.ring_size_bytes = ring_size; | |
280 | sd->ahu.head_stack = thread_stack_alloc(); | |
5b38ee84 JA |
281 | sd->ahu.head_eip = (unsigned long) cachemiss_thread_start; |
282 | sd->ahu.new_thread_eip = (unsigned long) cachemiss_thread_start; | |
db64e9bc JA |
283 | |
284 | return 0; | |
a4f4fdd7 JA |
285 | } |
286 | ||
2ca50be4 | 287 | static void async_head_exit(struct syslet_data *sd) |
a4f4fdd7 | 288 | { |
7f059a76 | 289 | free(sd->ring); |
a4f4fdd7 JA |
290 | } |
291 | ||
76f58b92 JA |
292 | static int check_syslet_support(struct syslet_data *sd) |
293 | { | |
294 | struct syslet_uatom atom; | |
295 | void *ret; | |
296 | ||
297 | init_atom(&atom, __NR_getpid, NULL, NULL, NULL, NULL, NULL, 0, NULL); | |
298 | ret = async_exec(sd->head, &sd->ahu); | |
299 | if (ret == (void *) -1) | |
300 | return 1; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
a4f4fdd7 JA |
305 | static void fio_syslet_cleanup(struct thread_data *td) |
306 | { | |
307 | struct syslet_data *sd = td->io_ops->data; | |
308 | ||
309 | if (sd) { | |
2ca50be4 | 310 | async_head_exit(sd); |
a4f4fdd7 JA |
311 | free(sd->events); |
312 | free(sd); | |
313 | td->io_ops->data = NULL; | |
314 | } | |
315 | } | |
316 | ||
317 | static int fio_syslet_init(struct thread_data *td) | |
318 | { | |
319 | struct syslet_data *sd; | |
320 | ||
321 | sd = malloc(sizeof(*sd)); | |
322 | memset(sd, 0, sizeof(*sd)); | |
2dc1bbeb JA |
323 | sd->events = malloc(sizeof(struct io_u *) * td->o.iodepth); |
324 | memset(sd->events, 0, sizeof(struct io_u *) * td->o.iodepth); | |
db64e9bc JA |
325 | |
326 | /* | |
327 | * This will handily fail for kernels where syslet isn't available | |
328 | */ | |
2dc1bbeb | 329 | if (async_head_init(sd, td->o.iodepth)) { |
db64e9bc JA |
330 | free(sd->events); |
331 | free(sd); | |
332 | return 1; | |
333 | } | |
334 | ||
76f58b92 JA |
335 | if (check_syslet_support(sd)) { |
336 | log_err("fio: syslets do not appear to work\n"); | |
337 | free(sd->events); | |
338 | free(sd); | |
339 | return 1; | |
340 | } | |
341 | ||
a4f4fdd7 | 342 | td->io_ops->data = sd; |
a4f4fdd7 JA |
343 | return 0; |
344 | } | |
345 | ||
346 | static struct ioengine_ops ioengine = { | |
347 | .name = "syslet-rw", | |
348 | .version = FIO_IOOPS_VERSION, | |
349 | .init = fio_syslet_init, | |
350 | .prep = fio_syslet_prep, | |
351 | .queue = fio_syslet_queue, | |
9ff9de69 | 352 | .commit = fio_syslet_commit, |
a4f4fdd7 JA |
353 | .getevents = fio_syslet_getevents, |
354 | .event = fio_syslet_event, | |
355 | .cleanup = fio_syslet_cleanup, | |
b5af8293 JA |
356 | .open_file = generic_open_file, |
357 | .close_file = generic_close_file, | |
a4f4fdd7 JA |
358 | }; |
359 | ||
360 | #else /* FIO_HAVE_SYSLET */ | |
361 | ||
362 | /* | |
363 | * When we have a proper configure system in place, we simply wont build | |
364 | * and install this io engine. For now install a crippled version that | |
365 | * just complains and fails to load. | |
366 | */ | |
367 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
368 | { | |
369 | fprintf(stderr, "fio: syslet not available\n"); | |
370 | return 1; | |
371 | } | |
372 | ||
373 | static struct ioengine_ops ioengine = { | |
374 | .name = "syslet-rw", | |
375 | .version = FIO_IOOPS_VERSION, | |
376 | .init = fio_syslet_init, | |
377 | }; | |
378 | ||
379 | #endif /* FIO_HAVE_SYSLET */ | |
380 | ||
381 | static void fio_init fio_syslet_register(void) | |
382 | { | |
383 | register_ioengine(&ioengine); | |
384 | } | |
385 | ||
386 | static void fio_exit fio_syslet_unregister(void) | |
387 | { | |
388 | unregister_ioengine(&ioengine); | |
389 | } |