Commit | Line | Data |
---|---|---|
fb7b71a3 JA |
1 | /* |
2 | * blktrace support code for fio | |
3 | */ | |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
5e6c2067 JA |
6 | #include <sys/stat.h> |
7 | #include <dirent.h> | |
8c1fdf04 | 8 | |
01743ee1 | 9 | #include "flist.h" |
fb7b71a3 JA |
10 | #include "fio.h" |
11 | #include "blktrace_api.h" | |
12 | ||
2da7df1d | 13 | #define TRACE_FIFO_SIZE 8192 |
e2887563 JA |
14 | |
15 | /* | |
16 | * fifo refill frontend, to avoid reading data in trace sized bites | |
17 | */ | |
18 | static int refill_fifo(struct thread_data *td, struct fifo *fifo, int fd) | |
19 | { | |
20 | char buf[TRACE_FIFO_SIZE]; | |
f12b323f | 21 | unsigned int total; |
e2887563 JA |
22 | int ret; |
23 | ||
f12b323f JA |
24 | total = sizeof(buf); |
25 | if (total > fifo_room(fifo)) | |
26 | total = fifo_room(fifo); | |
e2887563 | 27 | |
f12b323f JA |
28 | ret = read(fd, buf, total); |
29 | if (ret < 0) { | |
30 | td_verror(td, errno, "read blktrace file"); | |
31 | return -1; | |
e2887563 JA |
32 | } |
33 | ||
f12b323f JA |
34 | if (ret > 0) |
35 | ret = fifo_put(fifo, buf, ret); | |
36 | ||
bd6f78b2 | 37 | dprint(FD_BLKTRACE, "refill: filled %d bytes\n", ret); |
f12b323f | 38 | return ret; |
e2887563 JA |
39 | } |
40 | ||
41 | /* | |
42 | * Retrieve 'len' bytes from the fifo, refilling if necessary. | |
43 | */ | |
44 | static int trace_fifo_get(struct thread_data *td, struct fifo *fifo, int fd, | |
45 | void *buf, unsigned int len) | |
46 | { | |
f12b323f JA |
47 | if (fifo_len(fifo) < len) { |
48 | int ret = refill_fifo(td, fifo, fd); | |
e2887563 | 49 | |
f12b323f JA |
50 | if (ret < 0) |
51 | return ret; | |
52 | } | |
e2887563 JA |
53 | |
54 | return fifo_get(fifo, buf, len); | |
55 | } | |
56 | ||
8c1fdf04 JA |
57 | /* |
58 | * Just discard the pdu by seeking past it. | |
59 | */ | |
f12b323f JA |
60 | static int discard_pdu(struct thread_data *td, struct fifo *fifo, int fd, |
61 | struct blk_io_trace *t) | |
fb7b71a3 JA |
62 | { |
63 | if (t->pdu_len == 0) | |
64 | return 0; | |
65 | ||
bd6f78b2 | 66 | dprint(FD_BLKTRACE, "discard pdu len %u\n", t->pdu_len); |
f12b323f | 67 | return trace_fifo_get(td, fifo, fd, NULL, t->pdu_len); |
fb7b71a3 JA |
68 | } |
69 | ||
8c1fdf04 JA |
70 | /* |
71 | * Check if this is a blktrace binary data file. We read a single trace | |
72 | * into memory and check for the magic signature. | |
73 | */ | |
d95b34a6 | 74 | int is_blktrace(const char *filename, int *need_swap) |
fb7b71a3 JA |
75 | { |
76 | struct blk_io_trace t; | |
77 | int fd, ret; | |
78 | ||
79 | fd = open(filename, O_RDONLY); | |
4dced407 | 80 | if (fd < 0) |
fb7b71a3 | 81 | return 0; |
fb7b71a3 JA |
82 | |
83 | ret = read(fd, &t, sizeof(t)); | |
84 | close(fd); | |
85 | ||
86 | if (ret < 0) { | |
87 | perror("read blktrace"); | |
88 | return 0; | |
89 | } else if (ret != sizeof(t)) { | |
90 | log_err("fio: short read on blktrace file\n"); | |
91 | return 0; | |
92 | } | |
93 | ||
d95b34a6 JA |
94 | if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC) { |
95 | *need_swap = 0; | |
fb7b71a3 | 96 | return 1; |
d95b34a6 JA |
97 | } |
98 | ||
99 | /* | |
100 | * Maybe it needs to be endian swapped... | |
101 | */ | |
102 | t.magic = fio_swap32(t.magic); | |
103 | if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC) { | |
104 | *need_swap = 1; | |
105 | return 1; | |
106 | } | |
fb7b71a3 JA |
107 | |
108 | return 0; | |
109 | } | |
110 | ||
d1c46c04 DN |
111 | static int lookup_device(struct thread_data *td, char *path, unsigned int maj, |
112 | unsigned int min) | |
5e6c2067 JA |
113 | { |
114 | struct dirent *dir; | |
115 | struct stat st; | |
116 | int found = 0; | |
117 | DIR *D; | |
118 | ||
119 | D = opendir(path); | |
120 | if (!D) | |
121 | return 0; | |
122 | ||
123 | while ((dir = readdir(D)) != NULL) { | |
124 | char full_path[256]; | |
125 | ||
126 | if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")) | |
127 | continue; | |
128 | ||
b9fd788f | 129 | sprintf(full_path, "%s%s%s", path, FIO_OS_PATH_SEPARATOR, dir->d_name); |
5e6c2067 JA |
130 | if (lstat(full_path, &st) == -1) { |
131 | perror("lstat"); | |
132 | break; | |
133 | } | |
134 | ||
135 | if (S_ISDIR(st.st_mode)) { | |
d1c46c04 | 136 | found = lookup_device(td, full_path, maj, min); |
5e6c2067 JA |
137 | if (found) { |
138 | strcpy(path, full_path); | |
139 | break; | |
140 | } | |
141 | } | |
142 | ||
143 | if (!S_ISBLK(st.st_mode)) | |
144 | continue; | |
145 | ||
d1c46c04 DN |
146 | /* |
147 | * If replay_redirect is set then always return this device | |
148 | * upon lookup which overrides the device lookup based on | |
149 | * major minor in the actual blktrace | |
150 | */ | |
151 | if (td->o.replay_redirect) { | |
152 | dprint(FD_BLKTRACE, "device lookup: %d/%d\n overridden" | |
153 | " with: %s", maj, min, | |
154 | td->o.replay_redirect); | |
155 | strcpy(path, td->o.replay_redirect); | |
156 | found = 1; | |
157 | break; | |
158 | } | |
159 | ||
5e6c2067 | 160 | if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) { |
5ec10eaa | 161 | dprint(FD_BLKTRACE, "device lookup: %d/%d\n", maj, min); |
5e6c2067 JA |
162 | strcpy(path, full_path); |
163 | found = 1; | |
164 | break; | |
165 | } | |
166 | } | |
167 | ||
168 | closedir(D); | |
169 | return found; | |
170 | } | |
171 | ||
c69aa91f JA |
172 | #define FMINORBITS 20 |
173 | #define FMINORMASK ((1U << FMINORBITS) - 1) | |
174 | #define FMAJOR(dev) ((unsigned int) ((dev) >> FMINORBITS)) | |
175 | #define FMINOR(dev) ((unsigned int) ((dev) & FMINORMASK)) | |
eeb9c2aa | 176 | |
89ac1d48 | 177 | static void trace_add_open_close_event(struct thread_data *td, int fileno, enum file_log_act action) |
691c8fb0 JA |
178 | { |
179 | struct io_piece *ipo; | |
180 | ||
181 | ipo = calloc(1, sizeof(*ipo)); | |
0d29de83 | 182 | init_ipo(ipo); |
691c8fb0 JA |
183 | |
184 | ipo->ddir = DDIR_INVAL; | |
185 | ipo->fileno = fileno; | |
89ac1d48 | 186 | ipo->file_action = action; |
01743ee1 | 187 | flist_add_tail(&ipo->list, &td->io_log_list); |
691c8fb0 JA |
188 | } |
189 | ||
89ac1d48 | 190 | static int trace_add_file(struct thread_data *td, __u32 device) |
5e6c2067 | 191 | { |
89ac1d48 | 192 | static unsigned int last_maj, last_min, last_fileno; |
c69aa91f JA |
193 | unsigned int maj = FMAJOR(device); |
194 | unsigned int min = FMINOR(device); | |
5e6c2067 JA |
195 | struct fio_file *f; |
196 | char dev[256]; | |
197 | unsigned int i; | |
198 | ||
199 | if (last_maj == maj && last_min == min) | |
89ac1d48 | 200 | return last_fileno; |
5e6c2067 JA |
201 | |
202 | last_maj = maj; | |
203 | last_min = min; | |
204 | ||
205 | /* | |
206 | * check for this file in our list | |
207 | */ | |
208 | for_each_file(td, f, i) | |
89ac1d48 SL |
209 | if (f->major == maj && f->minor == min) { |
210 | last_fileno = f->fileno; | |
211 | return last_fileno; | |
212 | } | |
5e6c2067 JA |
213 | |
214 | strcpy(dev, "/dev"); | |
d1c46c04 | 215 | if (lookup_device(td, dev, maj, min)) { |
691c8fb0 JA |
216 | int fileno; |
217 | ||
bd6f78b2 | 218 | dprint(FD_BLKTRACE, "add devices %s\n", dev); |
49ffb4a2 | 219 | fileno = add_file_exclusive(td, dev); |
89ac1d48 SL |
220 | trace_add_open_close_event(td, fileno, FIO_LOG_OPEN_FILE); |
221 | last_fileno = fileno; | |
bd6f78b2 | 222 | } |
f01b34ae | 223 | |
89ac1d48 | 224 | return last_fileno; |
5e6c2067 JA |
225 | } |
226 | ||
8c1fdf04 JA |
227 | /* |
228 | * Store blk_io_trace data in an ipo for later retrieval. | |
229 | */ | |
fdefd987 | 230 | static void store_ipo(struct thread_data *td, unsigned long long offset, |
89ac1d48 SL |
231 | unsigned int bytes, int rw, unsigned long long ttime, |
232 | int fileno) | |
fdefd987 JA |
233 | { |
234 | struct io_piece *ipo = malloc(sizeof(*ipo)); | |
235 | ||
0d29de83 JA |
236 | init_ipo(ipo); |
237 | ||
a2eea81b JA |
238 | /* |
239 | * the 512 is wrong here, it should be the hardware sector size... | |
240 | */ | |
241 | ipo->offset = offset * 512; | |
fdefd987 | 242 | ipo->len = bytes; |
8c1fdf04 | 243 | ipo->delay = ttime / 1000; |
fdefd987 JA |
244 | if (rw) |
245 | ipo->ddir = DDIR_WRITE; | |
246 | else | |
247 | ipo->ddir = DDIR_READ; | |
89ac1d48 | 248 | ipo->fileno = fileno; |
fdefd987 | 249 | |
bd6f78b2 JA |
250 | dprint(FD_BLKTRACE, "store ddir=%d, off=%llu, len=%lu, delay=%lu\n", |
251 | ipo->ddir, ipo->offset, | |
252 | ipo->len, ipo->delay); | |
691c8fb0 | 253 | queue_io_piece(td, ipo); |
fdefd987 JA |
254 | } |
255 | ||
0b9d69ec | 256 | static void handle_trace_notify(struct blk_io_trace *t) |
cd991b9e | 257 | { |
691c8fb0 JA |
258 | switch (t->action) { |
259 | case BLK_TN_PROCESS: | |
d95b34a6 JA |
260 | log_info("blktrace: got process notify: %x, %d\n", |
261 | t->action, t->pid); | |
691c8fb0 JA |
262 | break; |
263 | case BLK_TN_TIMESTAMP: | |
d95b34a6 JA |
264 | log_info("blktrace: got timestamp notify: %x, %d\n", |
265 | t->action, t->pid); | |
691c8fb0 | 266 | break; |
ff58fced JA |
267 | case BLK_TN_MESSAGE: |
268 | break; | |
691c8fb0 JA |
269 | default: |
270 | dprint(FD_BLKTRACE, "unknown trace act %x\n", t->action); | |
271 | break; | |
272 | } | |
273 | } | |
5b3023b8 | 274 | |
ff58fced JA |
275 | static void handle_trace_discard(struct thread_data *td, struct blk_io_trace *t, |
276 | unsigned long long ttime, unsigned long *ios) | |
277 | { | |
278 | struct io_piece *ipo = malloc(sizeof(*ipo)); | |
89ac1d48 | 279 | int fileno; |
ff58fced | 280 | |
0d29de83 | 281 | init_ipo(ipo); |
89ac1d48 | 282 | fileno = trace_add_file(td, t->device); |
ff58fced JA |
283 | |
284 | ios[DDIR_WRITE]++; | |
285 | td->o.size += t->bytes; | |
286 | ||
287 | memset(ipo, 0, sizeof(*ipo)); | |
288 | INIT_FLIST_HEAD(&ipo->list); | |
289 | ||
290 | /* | |
291 | * the 512 is wrong here, it should be the hardware sector size... | |
292 | */ | |
293 | ipo->offset = t->sector * 512; | |
294 | ipo->len = t->bytes; | |
295 | ipo->delay = ttime / 1000; | |
296 | ipo->ddir = DDIR_TRIM; | |
89ac1d48 | 297 | ipo->fileno = fileno; |
ff58fced JA |
298 | |
299 | dprint(FD_BLKTRACE, "store discard, off=%llu, len=%lu, delay=%lu\n", | |
300 | ipo->offset, ipo->len, | |
301 | ipo->delay); | |
302 | queue_io_piece(td, ipo); | |
303 | } | |
304 | ||
691c8fb0 JA |
305 | static void handle_trace_fs(struct thread_data *td, struct blk_io_trace *t, |
306 | unsigned long long ttime, unsigned long *ios, | |
307 | unsigned int *bs) | |
308 | { | |
309 | int rw; | |
89ac1d48 | 310 | int fileno; |
5b3023b8 | 311 | |
89ac1d48 | 312 | fileno = trace_add_file(td, t->device); |
5b3023b8 JA |
313 | |
314 | rw = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0; | |
315 | ||
316 | if (t->bytes > bs[rw]) | |
317 | bs[rw] = t->bytes; | |
318 | ||
319 | ios[rw]++; | |
320 | td->o.size += t->bytes; | |
89ac1d48 | 321 | store_ipo(td, t->sector, t->bytes, rw, ttime, fileno); |
cd991b9e JA |
322 | } |
323 | ||
691c8fb0 JA |
324 | /* |
325 | * We only care for queue traces, most of the others are side effects | |
326 | * due to internal workings of the block layer. | |
327 | */ | |
328 | static void handle_trace(struct thread_data *td, struct blk_io_trace *t, | |
329 | unsigned long long ttime, unsigned long *ios, | |
330 | unsigned int *bs) | |
331 | { | |
332 | if ((t->action & 0xffff) != __BLK_TA_QUEUE) | |
333 | return; | |
334 | if (t->action & BLK_TC_ACT(BLK_TC_PC)) | |
335 | return; | |
336 | ||
337 | if (t->action & BLK_TC_ACT(BLK_TC_NOTIFY)) | |
aec2de20 | 338 | handle_trace_notify(t); |
ff58fced JA |
339 | else if (t->action & BLK_TC_ACT(BLK_TC_DISCARD)) |
340 | handle_trace_discard(td, t, ttime, ios); | |
691c8fb0 JA |
341 | else |
342 | handle_trace_fs(td, t, ttime, ios, bs); | |
343 | } | |
344 | ||
d95b34a6 JA |
345 | static void byteswap_trace(struct blk_io_trace *t) |
346 | { | |
347 | t->magic = fio_swap32(t->magic); | |
348 | t->sequence = fio_swap32(t->sequence); | |
349 | t->time = fio_swap64(t->time); | |
350 | t->sector = fio_swap64(t->sector); | |
351 | t->bytes = fio_swap32(t->bytes); | |
352 | t->action = fio_swap32(t->action); | |
353 | t->pid = fio_swap32(t->pid); | |
354 | t->device = fio_swap32(t->device); | |
355 | t->cpu = fio_swap32(t->cpu); | |
356 | t->error = fio_swap16(t->error); | |
357 | t->pdu_len = fio_swap16(t->pdu_len); | |
358 | } | |
359 | ||
8c1fdf04 JA |
360 | /* |
361 | * Load a blktrace file by reading all the blk_io_trace entries, and storing | |
362 | * them as io_pieces like the fio text version would do. | |
363 | */ | |
d95b34a6 | 364 | int load_blktrace(struct thread_data *td, const char *filename, int need_swap) |
fb7b71a3 | 365 | { |
a61eddec | 366 | unsigned long long ttime, delay; |
fb7b71a3 | 367 | struct blk_io_trace t; |
4241ea8f | 368 | unsigned long ios[2], skipped_writes; |
a61eddec | 369 | unsigned int cpu; |
d84f8d49 | 370 | unsigned int rw_bs[2]; |
e2887563 | 371 | struct fifo *fifo; |
89ac1d48 SL |
372 | int fd, i; |
373 | struct fio_file *f; | |
fb7b71a3 JA |
374 | |
375 | fd = open(filename, O_RDONLY); | |
376 | if (fd < 0) { | |
377 | td_verror(td, errno, "open blktrace file"); | |
378 | return 1; | |
379 | } | |
380 | ||
e2887563 JA |
381 | fifo = fifo_alloc(TRACE_FIFO_SIZE); |
382 | ||
6df8adaa JA |
383 | td->o.size = 0; |
384 | ||
a61eddec | 385 | cpu = 0; |
d84f8d49 JA |
386 | ttime = 0; |
387 | ios[0] = ios[1] = 0; | |
388 | rw_bs[0] = rw_bs[1] = 0; | |
4241ea8f | 389 | skipped_writes = 0; |
fb7b71a3 | 390 | do { |
e2887563 | 391 | int ret = trace_fifo_get(td, fifo, fd, &t, sizeof(t)); |
fb7b71a3 | 392 | |
e2887563 | 393 | if (ret < 0) |
8c1fdf04 | 394 | goto err; |
e2887563 JA |
395 | else if (!ret) |
396 | break; | |
397 | else if (ret < (int) sizeof(t)) { | |
398 | log_err("fio: short fifo get\n"); | |
fb7b71a3 | 399 | break; |
fb7b71a3 JA |
400 | } |
401 | ||
d95b34a6 JA |
402 | if (need_swap) |
403 | byteswap_trace(&t); | |
404 | ||
fb7b71a3 | 405 | if ((t.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) { |
5ec10eaa JA |
406 | log_err("fio: bad magic in blktrace data: %x\n", |
407 | t.magic); | |
8c1fdf04 | 408 | goto err; |
fb7b71a3 JA |
409 | } |
410 | if ((t.magic & 0xff) != BLK_IO_TRACE_VERSION) { | |
5ec10eaa JA |
411 | log_err("fio: bad blktrace version %d\n", |
412 | t.magic & 0xff); | |
8c1fdf04 | 413 | goto err; |
fb7b71a3 | 414 | } |
f12b323f JA |
415 | ret = discard_pdu(td, fifo, fd, &t); |
416 | if (ret < 0) { | |
fb7b71a3 | 417 | td_verror(td, ret, "blktrace lseek"); |
8c1fdf04 | 418 | goto err; |
f12b323f JA |
419 | } else if (t.pdu_len != ret) { |
420 | log_err("fio: discarded %d of %d\n", ret, t.pdu_len); | |
421 | goto err; | |
fb7b71a3 | 422 | } |
691c8fb0 JA |
423 | if ((t.action & BLK_TC_ACT(BLK_TC_NOTIFY)) == 0) { |
424 | if (!ttime) { | |
425 | ttime = t.time; | |
426 | cpu = t.cpu; | |
427 | } | |
428 | ||
429 | delay = 0; | |
430 | if (cpu == t.cpu) | |
431 | delay = t.time - ttime; | |
432 | if ((t.action & BLK_TC_ACT(BLK_TC_WRITE)) && read_only) | |
433 | skipped_writes++; | |
64bbb865 DN |
434 | else { |
435 | /* | |
436 | * set delay to zero if no_stall enabled for | |
437 | * fast replay | |
438 | */ | |
439 | if (td->o.no_stall) | |
440 | delay = 0; | |
441 | ||
691c8fb0 | 442 | handle_trace(td, &t, delay, ios, rw_bs); |
64bbb865 | 443 | } |
691c8fb0 | 444 | |
8c1fdf04 | 445 | ttime = t.time; |
a61eddec | 446 | cpu = t.cpu; |
a6edd638 JA |
447 | } else { |
448 | delay = 0; | |
4241ea8f | 449 | handle_trace(td, &t, delay, ios, rw_bs); |
a6edd638 | 450 | } |
fb7b71a3 JA |
451 | } while (1); |
452 | ||
85a47ca2 | 453 | for (i = 0; i < td->files_index; i++) { |
f01b34ae | 454 | f = td->files[i]; |
89ac1d48 | 455 | trace_add_open_close_event(td, f->fileno, FIO_LOG_CLOSE_FILE); |
85a47ca2 | 456 | } |
89ac1d48 | 457 | |
38470f85 | 458 | fifo_free(fifo); |
fb7b71a3 | 459 | close(fd); |
8c1fdf04 | 460 | |
f01b34ae JA |
461 | if (!td->files_index) { |
462 | log_err("fio: did not find replay device(s)\n"); | |
463 | return 1; | |
464 | } | |
465 | ||
4241ea8f | 466 | if (skipped_writes) |
5ec10eaa JA |
467 | log_err("fio: %s skips replay of %lu writes due to read-only\n", |
468 | td->o.name, skipped_writes); | |
4241ea8f | 469 | |
8c1fdf04 JA |
470 | if (!ios[DDIR_READ] && !ios[DDIR_WRITE]) { |
471 | log_err("fio: found no ios in blktrace data\n"); | |
472 | return 1; | |
d84f8d49 | 473 | } else if (ios[DDIR_READ] && !ios[DDIR_READ]) { |
8c1fdf04 | 474 | td->o.td_ddir = TD_DDIR_READ; |
d84f8d49 JA |
475 | td->o.max_bs[DDIR_READ] = rw_bs[DDIR_READ]; |
476 | } else if (!ios[DDIR_READ] && ios[DDIR_WRITE]) { | |
8c1fdf04 | 477 | td->o.td_ddir = TD_DDIR_WRITE; |
d84f8d49 JA |
478 | td->o.max_bs[DDIR_WRITE] = rw_bs[DDIR_WRITE]; |
479 | } else { | |
8c1fdf04 | 480 | td->o.td_ddir = TD_DDIR_RW; |
d84f8d49 JA |
481 | td->o.max_bs[DDIR_READ] = rw_bs[DDIR_READ]; |
482 | td->o.max_bs[DDIR_WRITE] = rw_bs[DDIR_WRITE]; | |
483 | } | |
8c1fdf04 JA |
484 | |
485 | /* | |
486 | * We need to do direct/raw ios to the device, to avoid getting | |
487 | * read-ahead in our way. | |
488 | */ | |
489 | td->o.odirect = 1; | |
490 | ||
fb7b71a3 | 491 | return 0; |
8c1fdf04 JA |
492 | err: |
493 | close(fd); | |
38470f85 | 494 | fifo_free(fifo); |
8c1fdf04 | 495 | return 1; |
fb7b71a3 | 496 | } |