1 #include <stdio.h>
2 #include <stdio.h>
3 #include <unistd.h>
4 #include <inttypes.h>
5 #include <math.h>
6 #include <assert.h>
7
8 #include "../io_ddir.h"
9 #include "../flist.h"
10 #include "../hash.h"
11 #include "../fifo.h"
12 #include "../blktrace_api.h"
13 #include "../os/os.h"
14 #include "../log.h"
15 #include "../lib/linux-dev-lookup.h"
16
17 #define TRACE_FIFO_SIZE 8192
18
19 static unsigned int rt_threshold = 1000000;
20 static unsigned int ios_threshold = 10;
21 static unsigned int rate_threshold;
22 static unsigned int set_rate;
23 static unsigned int max_depth = 256;
24 static int output_ascii = 1;
25 static char *filename;
26
27 static char **add_opts;
28 static int n_add_opts;
29
30 /*
31 * Collapse defaults
32 */
33 static unsigned int collapse_entries = 0;
34 static unsigned int depth_diff = 1;
35 static unsigned int random_diff = 5;
36
37 struct bs {
38 unsigned int bs;
39 unsigned int nr;
40 int merges;
41 };
42
43 struct trace_file {
44 char *name;
45 int major, minor;
46 };
47
48 struct btrace_out {
49 unsigned long ios[DDIR_RWDIR_CNT];
50 unsigned long merges[DDIR_RWDIR_CNT];
51
52 uint64_t last_end[DDIR_RWDIR_CNT];
53 uint64_t seq[DDIR_RWDIR_CNT];
54
55 struct bs *bs[DDIR_RWDIR_CNT];
56 unsigned int nr_bs[DDIR_RWDIR_CNT];
57
58 int inflight;
59 unsigned int depth;
60 int depth_disabled;
61 int complete_seen;
62
63 uint64_t first_ttime[DDIR_RWDIR_CNT];
64 uint64_t last_ttime[DDIR_RWDIR_CNT];
65 uint64_t kb[DDIR_RWDIR_CNT];
66
67 uint64_t start_delay;
68 };
69
70 struct btrace_pid {
71 struct flist_head hash_list;
72 struct flist_head pid_list;
73 pid_t pid;
74
75 pid_t *merge_pids;
76 unsigned int nr_merge_pids;
77
78 struct trace_file *files;
79 int nr_files;
80 unsigned int last_major, last_minor;
81 int numjobs;
82 int ignore;
83
84 struct btrace_out o;
85 };
86
87 struct inflight {
88 struct flist_head list;
89 struct btrace_pid *p;
90 uint64_t end_sector;
91 };
92
93 #define PID_HASH_BITS 10
94 #define PID_HASH_SIZE (1U << PID_HASH_BITS)
95
96 static struct flist_head pid_hash[PID_HASH_SIZE];
97 static FLIST_HEAD(pid_list);
98
99 #define INFLIGHT_HASH_BITS 8
100 #define INFLIGHT_HASH_SIZE (1U << INFLIGHT_HASH_BITS)
101 static struct flist_head inflight_hash[INFLIGHT_HASH_SIZE];
102
103 static uint64_t first_ttime = -1ULL;
104
inflight_find(uint64_t sector)105 static struct inflight *inflight_find(uint64_t sector)
106 {
107 struct flist_head *inflight_list;
108 struct flist_head *e;
109
110 inflight_list = &inflight_hash[hash_long(sector, INFLIGHT_HASH_BITS)];
111
112 flist_for_each(e, inflight_list) {
113 struct inflight *i = flist_entry(e, struct inflight, list);
114
115 if (i->end_sector == sector)
116 return i;
117 }
118
119 return NULL;
120 }
121
inflight_remove(struct inflight * i)122 static void inflight_remove(struct inflight *i)
123 {
124 struct btrace_out *o = &i->p->o;
125
126 o->inflight--;
127 assert(o->inflight >= 0);
128 flist_del(&i->list);
129 free(i);
130 }
131
__inflight_add(struct inflight * i)132 static void __inflight_add(struct inflight *i)
133 {
134 struct flist_head *list;
135
136 list = &inflight_hash[hash_long(i->end_sector, INFLIGHT_HASH_BITS)];
137 flist_add_tail(&i->list, list);
138 }
139
inflight_add(struct btrace_pid * p,uint64_t sector,uint32_t len)140 static void inflight_add(struct btrace_pid *p, uint64_t sector, uint32_t len)
141 {
142 struct btrace_out *o = &p->o;
143 struct inflight *i;
144
145 i = calloc(1, sizeof(*i));
146 i->p = p;
147 o->inflight++;
148 if (!o->depth_disabled) {
149 o->depth = max((int) o->depth, o->inflight);
150 if (o->depth >= max_depth && !o->complete_seen) {
151 o->depth_disabled = 1;
152 o->depth = max_depth;
153 }
154 }
155 i->end_sector = sector + (len >> 9);
156 __inflight_add(i);
157 }
158
inflight_merge(struct inflight * i,int rw,unsigned int size)159 static void inflight_merge(struct inflight *i, int rw, unsigned int size)
160 {
161 i->p->o.merges[rw]++;
162 if (size) {
163 i->end_sector += (size >> 9);
164 flist_del(&i->list);
165 __inflight_add(i);
166 }
167 }
168
169 /*
170 * fifo refill frontend, to avoid reading data in trace sized bites
171 */
refill_fifo(struct fifo * fifo,int fd)172 static int refill_fifo(struct fifo *fifo, int fd)
173 {
174 char buf[TRACE_FIFO_SIZE];
175 unsigned int total;
176 int ret;
177
178 total = sizeof(buf);
179 if (total > fifo_room(fifo))
180 total = fifo_room(fifo);
181
182 ret = read(fd, buf, total);
183 if (ret < 0) {
184 perror("read refill");
185 return -1;
186 }
187
188 if (ret > 0)
189 ret = fifo_put(fifo, buf, ret);
190
191 return ret;
192 }
193
194 /*
195 * Retrieve 'len' bytes from the fifo, refilling if necessary.
196 */
trace_fifo_get(struct fifo * fifo,int fd,void * buf,unsigned int len)197 static int trace_fifo_get(struct fifo *fifo, int fd, void *buf,
198 unsigned int len)
199 {
200 if (fifo_len(fifo) < len) {
201 int ret = refill_fifo(fifo, fd);
202
203 if (ret < 0)
204 return ret;
205 }
206
207 return fifo_get(fifo, buf, len);
208 }
209
210 /*
211 * Just discard the pdu by seeking past it.
212 */
discard_pdu(struct fifo * fifo,int fd,struct blk_io_trace * t)213 static int discard_pdu(struct fifo *fifo, int fd, struct blk_io_trace *t)
214 {
215 if (t->pdu_len == 0)
216 return 0;
217
218 return trace_fifo_get(fifo, fd, NULL, t->pdu_len);
219 }
220
handle_trace_notify(struct blk_io_trace * t)221 static int handle_trace_notify(struct blk_io_trace *t)
222 {
223 switch (t->action) {
224 case BLK_TN_PROCESS:
225 //printf("got process notify: %x, %d\n", t->action, t->pid);
226 break;
227 case BLK_TN_TIMESTAMP:
228 //printf("got timestamp notify: %x, %d\n", t->action, t->pid);
229 break;
230 case BLK_TN_MESSAGE:
231 break;
232 default:
233 log_err("unknown trace act %x\n", t->action);
234 return 1;
235 }
236
237 return 0;
238 }
239
__add_bs(struct btrace_out * o,unsigned int len,int rw)240 static void __add_bs(struct btrace_out *o, unsigned int len, int rw)
241 {
242 o->bs[rw] = realloc(o->bs[rw], (o->nr_bs[rw] + 1) * sizeof(struct bs));
243 o->bs[rw][o->nr_bs[rw]].bs = len;
244 o->bs[rw][o->nr_bs[rw]].nr = 1;
245 o->nr_bs[rw]++;
246 }
247
add_bs(struct btrace_out * o,unsigned int len,int rw)248 static void add_bs(struct btrace_out *o, unsigned int len, int rw)
249 {
250 struct bs *bs = o->bs[rw];
251 int i;
252
253 if (!o->nr_bs[rw]) {
254 __add_bs(o, len, rw);
255 return;
256 }
257
258 for (i = 0; i < o->nr_bs[rw]; i++) {
259 if (bs[i].bs == len) {
260 bs[i].nr++;
261 return;
262 }
263 }
264
265 __add_bs(o, len, rw);
266 }
267
268 #define FMINORBITS 20
269 #define FMINORMASK ((1U << FMINORBITS) - 1)
270 #define FMAJOR(dev) ((unsigned int) ((dev) >> FMINORBITS))
271 #define FMINOR(dev) ((unsigned int) ((dev) & FMINORMASK))
272
btrace_add_file(struct btrace_pid * p,uint32_t devno)273 static int btrace_add_file(struct btrace_pid *p, uint32_t devno)
274 {
275 unsigned int maj = FMAJOR(devno);
276 unsigned int min = FMINOR(devno);
277 struct trace_file *f;
278 unsigned int i;
279 char dev[256];
280
281 if (filename)
282 return 0;
283 if (p->last_major == maj && p->last_minor == min)
284 return 0;
285
286 p->last_major = maj;
287 p->last_minor = min;
288
289 /*
290 * check for this file in our list
291 */
292 for (i = 0; i < p->nr_files; i++) {
293 f = &p->files[i];
294
295 if (f->major == maj && f->minor == min)
296 return 0;
297 }
298
299 strcpy(dev, "/dev");
300 if (!blktrace_lookup_device(NULL, dev, maj, min)) {
301 log_err("fio: failed to find device %u/%u\n", maj, min);
302 if (!output_ascii) {
303 log_err("fio: use -d to specify device\n");
304 return 1;
305 }
306 return 0;
307 }
308
309 p->files = realloc(p->files, (p->nr_files + 1) * sizeof(*f));
310 f = &p->files[p->nr_files];
311 f->name = strdup(dev);
312 f->major = maj;
313 f->minor = min;
314 p->nr_files++;
315 return 0;
316 }
317
t_to_rwdir(struct blk_io_trace * t)318 static int t_to_rwdir(struct blk_io_trace *t)
319 {
320 if (t->action & BLK_TC_ACT(BLK_TC_DISCARD))
321 return DDIR_TRIM;
322
323 return (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
324 }
325
handle_trace_discard(struct blk_io_trace * t,struct btrace_pid * p)326 static int handle_trace_discard(struct blk_io_trace *t, struct btrace_pid *p)
327 {
328 struct btrace_out *o = &p->o;
329
330 if (btrace_add_file(p, t->device))
331 return 1;
332
333 if (o->first_ttime[2] == -1ULL)
334 o->first_ttime[2] = t->time;
335
336 o->ios[DDIR_TRIM]++;
337 add_bs(o, t->bytes, DDIR_TRIM);
338 return 0;
339 }
340
handle_trace_fs(struct blk_io_trace * t,struct btrace_pid * p)341 static int handle_trace_fs(struct blk_io_trace *t, struct btrace_pid *p)
342 {
343 struct btrace_out *o = &p->o;
344 int rw;
345
346 if (btrace_add_file(p, t->device))
347 return 1;
348
349 first_ttime = min(first_ttime, (uint64_t) t->time);
350
351 rw = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
352
353 if (o->first_ttime[rw] == -1ULL)
354 o->first_ttime[rw] = t->time;
355
356 add_bs(o, t->bytes, rw);
357 o->ios[rw]++;
358
359 if (t->sector == o->last_end[rw] || o->last_end[rw] == -1ULL)
360 o->seq[rw]++;
361
362 o->last_end[rw] = t->sector + (t->bytes >> 9);
363 return 0;
364 }
365
handle_queue_trace(struct blk_io_trace * t,struct btrace_pid * p)366 static int handle_queue_trace(struct blk_io_trace *t, struct btrace_pid *p)
367 {
368 if (t->action & BLK_TC_ACT(BLK_TC_NOTIFY))
369 return handle_trace_notify(t);
370 else if (t->action & BLK_TC_ACT(BLK_TC_DISCARD))
371 return handle_trace_discard(t, p);
372 else
373 return handle_trace_fs(t, p);
374 }
375
handle_trace(struct blk_io_trace * t,struct btrace_pid * p)376 static int handle_trace(struct blk_io_trace *t, struct btrace_pid *p)
377 {
378 unsigned int act = t->action & 0xffff;
379 int ret = 0;
380
381 if (act == __BLK_TA_QUEUE) {
382 inflight_add(p, t->sector, t->bytes);
383 ret = handle_queue_trace(t, p);
384 } else if (act == __BLK_TA_BACKMERGE) {
385 struct inflight *i;
386
387 i = inflight_find(t->sector + (t->bytes >> 9));
388 if (i)
389 inflight_remove(i);
390
391 i = inflight_find(t->sector);
392 if (i)
393 inflight_merge(i, t_to_rwdir(t), t->bytes);
394 } else if (act == __BLK_TA_FRONTMERGE) {
395 struct inflight *i;
396
397 i = inflight_find(t->sector + (t->bytes >> 9));
398 if (i)
399 inflight_remove(i);
400
401 i = inflight_find(t->sector);
402 if (i)
403 inflight_merge(i, t_to_rwdir(t), 0);
404 } else if (act == __BLK_TA_COMPLETE) {
405 struct inflight *i;
406
407 i = inflight_find(t->sector + (t->bytes >> 9));
408 if (i) {
409 i->p->o.kb[t_to_rwdir(t)] += (t->bytes >> 10);
410 i->p->o.complete_seen = 1;
411 inflight_remove(i);
412 }
413 }
414
415 return ret;
416 }
417
byteswap_trace(struct blk_io_trace * t)418 static void byteswap_trace(struct blk_io_trace *t)
419 {
420 t->magic = fio_swap32(t->magic);
421 t->sequence = fio_swap32(t->sequence);
422 t->time = fio_swap64(t->time);
423 t->sector = fio_swap64(t->sector);
424 t->bytes = fio_swap32(t->bytes);
425 t->action = fio_swap32(t->action);
426 t->pid = fio_swap32(t->pid);
427 t->device = fio_swap32(t->device);
428 t->cpu = fio_swap32(t->cpu);
429 t->error = fio_swap16(t->error);
430 t->pdu_len = fio_swap16(t->pdu_len);
431 }
432
pid_hash_find(pid_t pid,struct flist_head * list)433 static struct btrace_pid *pid_hash_find(pid_t pid, struct flist_head *list)
434 {
435 struct flist_head *e;
436 struct btrace_pid *p;
437
438 flist_for_each(e, list) {
439 p = flist_entry(e, struct btrace_pid, hash_list);
440 if (p->pid == pid)
441 return p;
442 }
443
444 return NULL;
445 }
446
pid_hash_get(pid_t pid)447 static struct btrace_pid *pid_hash_get(pid_t pid)
448 {
449 struct flist_head *hash_list;
450 struct btrace_pid *p;
451
452 hash_list = &pid_hash[hash_long(pid, PID_HASH_BITS)];
453
454 p = pid_hash_find(pid, hash_list);
455 if (!p) {
456 int i;
457
458 p = calloc(1, sizeof(*p));
459
460 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
461 p->o.first_ttime[i] = -1ULL;
462 p->o.last_ttime[i] = -1ULL;
463 p->o.last_end[i] = -1ULL;
464 }
465
466 p->pid = pid;
467 p->numjobs = 1;
468 flist_add_tail(&p->hash_list, hash_list);
469 flist_add_tail(&p->pid_list, &pid_list);
470 }
471
472 return p;
473 }
474
475 /*
476 * Load a blktrace file by reading all the blk_io_trace entries, and storing
477 * them as io_pieces like the fio text version would do.
478 */
load_blktrace(const char * fname,int need_swap)479 static int load_blktrace(const char *fname, int need_swap)
480 {
481 struct btrace_pid *p;
482 unsigned long traces;
483 struct blk_io_trace t;
484 struct fifo *fifo;
485 int fd, ret = 0;
486
487 fd = open(fname, O_RDONLY);
488 if (fd < 0) {
489 perror("open trace file\n");
490 return 1;
491 }
492
493 fifo = fifo_alloc(TRACE_FIFO_SIZE);
494
495 traces = 0;
496 do {
497 ret = trace_fifo_get(fifo, fd, &t, sizeof(t));
498 if (ret < 0)
499 goto err;
500 else if (!ret)
501 break;
502 else if (ret < (int) sizeof(t)) {
503 log_err("fio: short fifo get\n");
504 break;
505 }
506
507 if (need_swap)
508 byteswap_trace(&t);
509
510 if ((t.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
511 log_err("fio: bad magic in blktrace data: %x\n", t.magic);
512 goto err;
513 }
514 if ((t.magic & 0xff) != BLK_IO_TRACE_VERSION) {
515 log_err("fio: bad blktrace version %d\n", t.magic & 0xff);
516 goto err;
517 }
518 ret = discard_pdu(fifo, fd, &t);
519 if (ret < 0) {
520 log_err("blktrace lseek\n");
521 goto err;
522 } else if (t.pdu_len != ret) {
523 log_err("fio: discarded %d of %d\n", ret, t.pdu_len);
524 goto err;
525 }
526
527 p = pid_hash_get(t.pid);
528 ret = handle_trace(&t, p);
529 if (ret)
530 break;
531 p->o.last_ttime[t_to_rwdir(&t)] = t.time;
532 traces++;
533 } while (1);
534
535 fifo_free(fifo);
536 close(fd);
537
538 if (ret)
539 return ret;
540
541 if (output_ascii)
542 printf("Traces loaded: %lu\n", traces);
543
544 return 0;
545 err:
546 close(fd);
547 fifo_free(fifo);
548 return 1;
549 }
550
bs_cmp(const void * ba,const void * bb)551 static int bs_cmp(const void *ba, const void *bb)
552 {
553 const struct bs *bsa = ba;
554 const struct bs *bsb = bb;
555
556 return bsb->nr - bsa->nr;
557 }
558
o_to_kb_rate(struct btrace_out * o,int rw)559 static unsigned long o_to_kb_rate(struct btrace_out *o, int rw)
560 {
561 uint64_t usec = (o->last_ttime[rw] - o->first_ttime[rw]) / 1000ULL;
562 uint64_t val;
563
564 if (!usec)
565 return 0;
566
567 usec /= 1000;
568 if (!usec)
569 return 0;
570
571 val = o->kb[rw] * 1000ULL;
572 return val / usec;
573 }
574
o_first_ttime(struct btrace_out * o)575 static uint64_t o_first_ttime(struct btrace_out *o)
576 {
577 uint64_t first;
578
579 first = min(o->first_ttime[0], o->first_ttime[1]);
580 return min(first, o->first_ttime[2]);
581 }
582
o_longest_ttime(struct btrace_out * o)583 static uint64_t o_longest_ttime(struct btrace_out *o)
584 {
585 uint64_t ret = 0;
586 int i;
587
588 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
589 uint64_t diff;
590
591 diff = o->last_ttime[i] - o->first_ttime[i];
592 ret = max(diff, ret);
593 }
594
595 return ret;
596 }
597
__output_p_ascii(struct btrace_pid * p,unsigned long * ios)598 static void __output_p_ascii(struct btrace_pid *p, unsigned long *ios)
599 {
600 const char *msg[] = { "reads", "writes", "trims" };
601 struct btrace_out *o = &p->o;
602 unsigned long total, usec;
603 int i, j;
604
605 printf("[pid:\t%u", p->pid);
606 if (p->nr_merge_pids)
607 for (i = 0; i < p->nr_merge_pids; i++)
608 printf(", %u", p->merge_pids[i]);
609 printf("]\n");
610
611 total = ddir_rw_sum(o->ios);
612 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
613 float perc;
614
615 if (!o->ios[i])
616 continue;
617
618 ios[i] += o->ios[i] + o->merges[i];
619 printf("%s\n", msg[i]);
620 perc = ((float) o->ios[i] * 100.0) / (float) total;
621 printf("\tios: %lu (perc=%3.2f%%)\n", o->ios[i], perc);
622 perc = ((float) o->merges[i] * 100.0) / (float) total;
623 printf("\tmerges: %lu (perc=%3.2f%%)\n", o->merges[i], perc);
624 perc = ((float) o->seq[i] * 100.0) / (float) o->ios[i];
625 printf("\tseq: %lu (perc=%3.2f%%)\n", (unsigned long) o->seq[i], perc);
626 printf("\trate: %lu KB/sec\n", o_to_kb_rate(o, i));
627
628 for (j = 0; j < o->nr_bs[i]; j++) {
629 struct bs *bs = &o->bs[i][j];
630
631 perc = (((float) bs->nr * 100.0) / (float) o->ios[i]);
632 printf("\tbs=%u, perc=%3.2f%%\n", bs->bs, perc);
633 }
634 }
635
636 printf("depth:\t%u\n", o->depth);
637 usec = o_longest_ttime(o) / 1000ULL;
638 printf("usec:\t%lu (delay=%llu)\n", usec, (unsigned long long) o->start_delay);
639
640 printf("files:\t");
641 for (i = 0; i < p->nr_files; i++)
642 printf("%s,", p->files[i].name);
643 printf("\n");
644
645 printf("\n");
646 }
647
__output_p_fio(struct btrace_pid * p,unsigned long * ios)648 static int __output_p_fio(struct btrace_pid *p, unsigned long *ios)
649 {
650 struct btrace_out *o = &p->o;
651 unsigned long total;
652 unsigned long long time;
653 float perc;
654 int i, j;
655
656 if ((o->ios[0] + o->ios[1]) && o->ios[2]) {
657 log_err("fio: trace has both read/write and trim\n");
658 return 1;
659 }
660 if (!p->nr_files) {
661 log_err("fio: no devices found\n");
662 return 1;
663 }
664
665 printf("[pid%u", p->pid);
666 if (p->nr_merge_pids)
667 for (i = 0; i < p->nr_merge_pids; i++)
668 printf(",pid%u", p->merge_pids[i]);
669 printf("]\n");
670
671 printf("numjobs=%u\n", p->numjobs);
672 printf("direct=1\n");
673 if (o->depth == 1)
674 printf("ioengine=sync\n");
675 else
676 printf("ioengine=libaio\niodepth=%u\n", o->depth);
677
678 if (o->ios[0] && !o->ios[1])
679 printf("rw=randread\n");
680 else if (!o->ios[0] && o->ios[1])
681 printf("rw=randwrite\n");
682 else if (o->ios[2])
683 printf("rw=randtrim\n");
684 else {
685 printf("rw=randrw\n");
686 total = ddir_rw_sum(o->ios);
687 perc = ((float) o->ios[0] * 100.0) / (float) total;
688 printf("rwmixread=%u\n", (int) floor(perc + 0.50));
689 }
690
691 printf("percentage_random=");
692 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
693 if (o->seq[i] && o->ios[i]) {
694 perc = ((float) o->seq[i] * 100.0) / (float) o->ios[i];
695 if (perc >= 99.0)
696 perc = 100.0;
697 } else
698 perc = 100.0;
699
700 if (i)
701 printf(",");
702 perc = 100.0 - perc;
703 printf("%u", (int) floor(perc + 0.5));
704 }
705 printf("\n");
706
707 printf("filename=");
708 for (i = 0; i < p->nr_files; i++) {
709 if (i)
710 printf(":");
711 printf("%s", p->files[i].name);
712 }
713 printf("\n");
714
715 if (o->start_delay / 1000000ULL)
716 printf("startdelay=%llus\n", o->start_delay / 1000000ULL);
717
718 time = o_longest_ttime(o);
719 time = (time + 1000000000ULL - 1) / 1000000000ULL;
720 printf("runtime=%llus\n", time);
721
722 printf("bssplit=");
723 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
724
725 if (i && o->nr_bs[i - 1] && o->nr_bs[i])
726 printf(",");
727
728 for (j = 0; j < o->nr_bs[i]; j++) {
729 struct bs *bs = &o->bs[i][j];
730
731 perc = (((float) bs->nr * 100.0) / (float) o->ios[i]);
732 if (perc < 1.00)
733 continue;
734 if (j)
735 printf(":");
736 if (j + 1 == o->nr_bs[i])
737 printf("%u/", bs->bs);
738 else
739 printf("%u/%u", bs->bs, (int) floor(perc + 0.5));
740 }
741 }
742 printf("\n");
743
744 if (set_rate) {
745 printf("rate=");
746 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
747 unsigned long rate;
748
749 rate = o_to_kb_rate(o, i);
750 if (i)
751 printf(",");
752 if (rate)
753 printf("%luk", rate);
754 }
755 printf("\n");
756 }
757
758 if (n_add_opts)
759 for (i = 0; i < n_add_opts; i++)
760 printf("%s\n", add_opts[i]);
761
762 printf("\n");
763 return 0;
764 }
765
__output_p(struct btrace_pid * p,unsigned long * ios)766 static int __output_p(struct btrace_pid *p, unsigned long *ios)
767 {
768 struct btrace_out *o = &p->o;
769 int i, ret = 0;
770
771 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
772 if (o->nr_bs[i] <= 1)
773 continue;
774 qsort(o->bs[i], o->nr_bs[i], sizeof(struct bs), bs_cmp);
775 }
776
777 if (filename) {
778 p->files = malloc(sizeof(struct trace_file));
779 p->nr_files++;
780 p->files[0].name = filename;
781 }
782
783 if (output_ascii)
784 __output_p_ascii(p, ios);
785 else
786 ret = __output_p_fio(p, ios);
787
788 return ret;
789 }
790
remove_ddir(struct btrace_out * o,int rw)791 static void remove_ddir(struct btrace_out *o, int rw)
792 {
793 o->ios[rw] = 0;
794 }
795
prune_entry(struct btrace_out * o)796 static int prune_entry(struct btrace_out *o)
797 {
798 unsigned long rate;
799 uint64_t time;
800 int i;
801
802 if (ddir_rw_sum(o->ios) < ios_threshold)
803 return 1;
804
805 time = o_longest_ttime(o) / 1000ULL;
806 if (time < rt_threshold)
807 return 1;
808
809 rate = 0;
810 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
811 unsigned long this_rate;
812
813 this_rate = o_to_kb_rate(o, i);
814 if (this_rate < rate_threshold) {
815 remove_ddir(o, i);
816 this_rate = 0;
817 }
818 rate += this_rate;
819 }
820
821 if (rate < rate_threshold)
822 return 1;
823
824 return 0;
825 }
826
entry_cmp(void * priv,struct flist_head * a,struct flist_head * b)827 static int entry_cmp(void *priv, struct flist_head *a, struct flist_head *b)
828 {
829 struct btrace_pid *pa = flist_entry(a, struct btrace_pid, pid_list);
830 struct btrace_pid *pb = flist_entry(b, struct btrace_pid, pid_list);
831
832 return ddir_rw_sum(pb->o.ios) - ddir_rw_sum(pa->o.ios);
833 }
834
free_p(struct btrace_pid * p)835 static void free_p(struct btrace_pid *p)
836 {
837 struct btrace_out *o = &p->o;
838 int i;
839
840 for (i = 0; i < p->nr_files; i++) {
841 if (p->files[i].name && p->files[i].name != filename)
842 free(p->files[i].name);
843 }
844
845 for (i = 0; i < DDIR_RWDIR_CNT; i++)
846 free(o->bs[i]);
847
848 free(p->files);
849 flist_del(&p->pid_list);
850 flist_del(&p->hash_list);
851 free(p);
852 }
853
entries_close(struct btrace_pid * pida,struct btrace_pid * pidb)854 static int entries_close(struct btrace_pid *pida, struct btrace_pid *pidb)
855 {
856 float perca, percb, fdiff;
857 int i, idiff;
858
859 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
860 if ((pida->o.ios[i] && !pidb->o.ios[i]) ||
861 (pidb->o.ios[i] && !pida->o.ios[i]))
862 return 0;
863 if (pida->o.ios[i] && pidb->o.ios[i]) {
864 perca = ((float) pida->o.seq[i] * 100.0) / (float) pida->o.ios[i];
865 percb = ((float) pidb->o.seq[i] * 100.0) / (float) pidb->o.ios[i];
866 fdiff = perca - percb;
867 if (fabs(fdiff) > random_diff)
868 return 0;
869 }
870
871 idiff = pida->o.depth - pidb->o.depth;
872 if (abs(idiff) > depth_diff)
873 return 0;
874 }
875
876 return 1;
877 }
878
merge_bs(struct bs ** bsap,unsigned int * nr_bsap,struct bs * bsb,unsigned int nr_bsb)879 static void merge_bs(struct bs **bsap, unsigned int *nr_bsap,
880 struct bs *bsb, unsigned int nr_bsb)
881 {
882 struct bs *bsa = *bsap;
883 unsigned int nr_bsa = *nr_bsap;
884 int a, b;
885
886 for (b = 0; b < nr_bsb; b++) {
887 int next, found = 0;
888
889 for (a = 0; a < nr_bsa; a++) {
890 if (bsb[b].bs != bsa[a].bs)
891 continue;
892
893 bsa[a].nr += bsb[b].nr;
894 bsa[a].merges += bsb[b].merges;
895 found = 1;
896 break;
897 }
898
899 if (found)
900 continue;
901
902 next = *nr_bsap;
903 bsa = realloc(bsa, (next + 1) * sizeof(struct bs));
904 bsa[next].bs = bsb[b].bs;
905 bsa[next].nr = bsb[b].nr;
906 (*nr_bsap)++;
907 *bsap = bsa;
908 }
909 }
910
merge_entries(struct btrace_pid * pida,struct btrace_pid * pidb)911 static int merge_entries(struct btrace_pid *pida, struct btrace_pid *pidb)
912 {
913 int i;
914
915 if (!entries_close(pida, pidb))
916 return 0;
917
918 pida->nr_merge_pids++;
919 pida->merge_pids = realloc(pida->merge_pids, pida->nr_merge_pids * sizeof(pid_t));
920 pida->merge_pids[pida->nr_merge_pids - 1] = pidb->pid;
921
922 for (i = 0; i < DDIR_RWDIR_CNT; i++) {
923 struct btrace_out *oa = &pida->o;
924 struct btrace_out *ob = &pidb->o;
925
926 oa->ios[i] += ob->ios[i];
927 oa->merges[i] += ob->merges[i];
928 oa->seq[i] += ob->seq[i];
929 oa->kb[i] += ob->kb[i];
930 oa->first_ttime[i] = min(oa->first_ttime[i], ob->first_ttime[i]);
931 oa->last_ttime[i] = max(oa->last_ttime[i], ob->last_ttime[i]);
932 merge_bs(&oa->bs[i], &oa->nr_bs[i], ob->bs[i], ob->nr_bs[i]);
933 }
934
935 pida->o.start_delay = min(pida->o.start_delay, pidb->o.start_delay);
936 pida->o.depth = (pida->o.depth + pidb->o.depth) / 2;
937 return 1;
938 }
939
check_merges(struct btrace_pid * p,struct flist_head * pid_list)940 static void check_merges(struct btrace_pid *p, struct flist_head *pid_list)
941 {
942 struct flist_head *e, *tmp;
943
944 if (p->ignore)
945 return;
946
947 flist_for_each_safe(e, tmp, pid_list) {
948 struct btrace_pid *pidb;
949
950 pidb = flist_entry(e, struct btrace_pid, pid_list);
951 if (pidb == p)
952 continue;
953
954 if (merge_entries(p, pidb)) {
955 pidb->ignore = 1;
956 p->numjobs++;
957 }
958 }
959 }
960
output_p(void)961 static int output_p(void)
962 {
963 unsigned long ios[DDIR_RWDIR_CNT];
964 struct flist_head *e, *tmp;
965 int depth_disabled = 0;
966 int ret = 0;
967
968 flist_for_each_safe(e, tmp, &pid_list) {
969 struct btrace_pid *p;
970
971 p = flist_entry(e, struct btrace_pid, pid_list);
972 if (prune_entry(&p->o)) {
973 free_p(p);
974 continue;
975 }
976 p->o.start_delay = (o_first_ttime(&p->o) / 1000ULL) - first_ttime;
977 depth_disabled += p->o.depth_disabled;
978 }
979
980 if (collapse_entries) {
981 struct btrace_pid *p;
982
983 flist_for_each_safe(e, tmp, &pid_list) {
984 p = flist_entry(e, struct btrace_pid, pid_list);
985 check_merges(p, &pid_list);
986 }
987
988 flist_for_each_safe(e, tmp, &pid_list) {
989 p = flist_entry(e, struct btrace_pid, pid_list);
990 if (p->ignore)
991 free_p(p);
992 }
993 }
994
995 if (depth_disabled)
996 log_err("fio: missing completion traces, depths capped at %u\n", max_depth);
997
998 memset(ios, 0, sizeof(ios));
999
1000 flist_sort(NULL, &pid_list, entry_cmp);
1001
1002 flist_for_each(e, &pid_list) {
1003 struct btrace_pid *p;
1004
1005 p = flist_entry(e, struct btrace_pid, pid_list);
1006 ret |= __output_p(p, ios);
1007 if (ret && !output_ascii)
1008 break;
1009 }
1010
1011 if (output_ascii)
1012 printf("Total: reads=%lu, writes=%lu\n", ios[0], ios[1]);
1013
1014 return ret;
1015 }
1016
usage(char * argv[])1017 static int usage(char *argv[])
1018 {
1019 log_err("%s: [options] <blktrace bin file>\n", argv[0]);
1020 log_err("\t-t\tUsec threshold to ignore task\n");
1021 log_err("\t-n\tNumber IOS threshold to ignore task\n");
1022 log_err("\t-f\tFio job file output\n");
1023 log_err("\t-d\tUse this file/device for replay\n");
1024 log_err("\t-r\tIgnore jobs with less than this KB/sec rate\n");
1025 log_err("\t-R\tSet rate in fio job (def=%u)\n", set_rate);
1026 log_err("\t-D\tCap queue depth at this value (def=%u)\n", max_depth);
1027 log_err("\t-c\tCollapse \"identical\" jobs (def=%u)\n", collapse_entries);
1028 log_err("\t-u\tDepth difference for collapse (def=%u)\n", depth_diff);
1029 log_err("\t-x\tRandom difference for collapse (def=%u)\n", random_diff);
1030 log_err("\t-a\tAdditional fio option to add to job file\n");
1031 return 1;
1032 }
1033
trace_needs_swap(const char * trace_file,int * swap)1034 static int trace_needs_swap(const char *trace_file, int *swap)
1035 {
1036 struct blk_io_trace t;
1037 int fd, ret;
1038
1039 *swap = -1;
1040
1041 fd = open(trace_file, O_RDONLY);
1042 if (fd < 0) {
1043 perror("open");
1044 return 1;
1045 }
1046
1047 ret = read(fd, &t, sizeof(t));
1048 if (ret < 0) {
1049 close(fd);
1050 perror("read");
1051 return 1;
1052 } else if (ret != sizeof(t)) {
1053 close(fd);
1054 log_err("fio: short read on trace file\n");
1055 return 1;
1056 }
1057
1058 close(fd);
1059
1060 if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
1061 *swap = 0;
1062 else {
1063 /*
1064 * Maybe it needs to be endian swapped...
1065 */
1066 t.magic = fio_swap32(t.magic);
1067 if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
1068 *swap = 1;
1069 }
1070
1071 if (*swap == -1) {
1072 log_err("fio: blktrace appears corrupt\n");
1073 return 1;
1074 }
1075
1076 return 0;
1077 }
1078
main(int argc,char * argv[])1079 int main(int argc, char *argv[])
1080 {
1081 int need_swap, i, c;
1082
1083 if (argc < 2)
1084 return usage(argv);
1085
1086 while ((c = getopt(argc, argv, "t:n:fd:r:RD:c:u:x:a:")) != -1) {
1087 switch (c) {
1088 case 'R':
1089 set_rate = 1;
1090 break;
1091 case 'r':
1092 rate_threshold = atoi(optarg);
1093 break;
1094 case 't':
1095 rt_threshold = atoi(optarg);
1096 break;
1097 case 'n':
1098 ios_threshold = atoi(optarg);
1099 break;
1100 case 'f':
1101 output_ascii = 0;
1102 break;
1103 case 'd':
1104 filename = strdup(optarg);
1105 break;
1106 case 'D':
1107 max_depth = atoi(optarg);
1108 break;
1109 case 'c':
1110 collapse_entries = atoi(optarg);
1111 break;
1112 case 'u':
1113 depth_diff = atoi(optarg);
1114 break;
1115 case 'x':
1116 random_diff = atoi(optarg);
1117 break;
1118 case 'a':
1119 add_opts = realloc(add_opts, (n_add_opts + 1) * sizeof(char *));
1120 add_opts[n_add_opts] = strdup(optarg);
1121 n_add_opts++;
1122 break;
1123 case '?':
1124 default:
1125 return usage(argv);
1126 }
1127 }
1128
1129 if (argc == optind)
1130 return usage(argv);
1131
1132 if (trace_needs_swap(argv[optind], &need_swap))
1133 return 1;
1134
1135 for (i = 0; i < PID_HASH_SIZE; i++)
1136 INIT_FLIST_HEAD(&pid_hash[i]);
1137 for (i = 0; i < INFLIGHT_HASH_SIZE; i++)
1138 INIT_FLIST_HEAD(&inflight_hash[i]);
1139
1140 load_blktrace(argv[optind], need_swap);
1141 first_ttime /= 1000ULL;
1142
1143 return output_p();
1144 }
1145