blkparse.c

   1 /*
   2  * block queue tracing parse application
   3  *
   4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <getopt.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <locale.h>
  32 #include <limits.h>
  33
  34 #include "blktrace.h"
  35 #include "rbtree.h"
  36 #include "jhash.h"
  37
  38 static char blkparse_version[] = "0.90";
  39
  40 struct per_dev_info {
  41         dev_t dev;
  42         char *name;
  43
  44         int backwards;
  45         unsigned long long events;
  46         unsigned long long last_reported_time;
  47         unsigned long long last_read_time;
  48         struct io_stats io_stats;
  49         unsigned long last_sequence;
  50         unsigned long skips;
  51
  52         struct rb_root rb_last;
  53         unsigned long rb_last_entries;
  54
  55         struct rb_root rb_track;
  56
  57         int nfiles;
  58         int ncpus;
  59         struct per_cpu_info *cpus;
  60 };
  61
  62 struct per_process_info {
  63         char name[16];
  64         __u32 pid;
  65         struct io_stats io_stats;
  66         struct per_process_info *hash_next, *list_next;
  67         int more_than_one;
  68
  69         /*
  70          * individual io stats
  71          */
  72         unsigned long long longest_allocation_wait[2];
  73         unsigned long long longest_dispatch_wait[2];
  74         unsigned long long longest_completion_wait[2];
  75 };
  76
  77 #define PPI_HASH_SHIFT  (8)
  78 #define PPI_HASH_SIZE   (1 << PPI_HASH_SHIFT)
  79 #define PPI_HASH_MASK   (PPI_HASH_SIZE - 1)
  80 static struct per_process_info *ppi_hash_table[PPI_HASH_SIZE];
  81 static struct per_process_info *ppi_list;
  82 static int ppi_list_entries;
  83
  84 #define S_OPTS  "a:A:i:o:b:stqw:f:F:vVnD:"
  85 static struct option l_opts[] = {
  86         {
  87                 .name = "act-mask",
  88                 .has_arg = required_argument,
  89                 .flag = NULL,
  90                 .val = 'a'
  91         },
  92         {
  93                 .name = "set-mask",
  94                 .has_arg = required_argument,
  95                 .flag = NULL,
  96                 .val = 'A'
  97         },
  98         {
  99                 .name = "input",
 100                 .has_arg = required_argument,
 101                 .flag = NULL,
 102                 .val = 'i'
 103         },
 104         {
 105                 .name = "output",
 106                 .has_arg = required_argument,
 107                 .flag = NULL,
 108                 .val = 'o'
 109         },
 110         {
 111                 .name = "batch",
 112                 .has_arg = required_argument,
 113                 .flag = NULL,
 114                 .val = 'b'
 115         },
 116         {
 117                 .name = "per-program-stats",
 118                 .has_arg = no_argument,
 119                 .flag = NULL,
 120                 .val = 's'
 121         },
 122         {
 123                 .name = "track-ios",
 124                 .has_arg = no_argument,
 125                 .flag = NULL,
 126                 .val = 't'
 127         },
 128         {
 129                 .name = "quiet",
 130                 .has_arg = no_argument,
 131                 .flag = NULL,
 132                 .val = 'q'
 133         },
 134         {
 135                 .name = "stopwatch",
 136                 .has_arg = required_argument,
 137                 .flag = NULL,
 138                 .val = 'w'
 139         },
 140         {
 141                 .name = "format",
 142                 .has_arg = required_argument,
 143                 .flag = NULL,
 144                 .val = 'f'
 145         },
 146         {
 147                 .name = "format-spec",
 148                 .has_arg = required_argument,
 149                 .flag = NULL,
 150                 .val = 'F'
 151         },
 152         {
 153                 .name = "hash-by-name",
 154                 .has_arg = no_argument,
 155                 .flag = NULL,
 156                 .val = 'n'
 157         },
 158         {
 159                 .name = "verbose",
 160                 .has_arg = no_argument,
 161                 .flag = NULL,
 162                 .val = 'v'
 163         },
 164         {
 165                 .name = "version",
 166                 .has_arg = no_argument,
 167                 .flag = NULL,
 168                 .val = 'V'
 169         },
 170         {
 171                 .name = "input-directory",
 172                 .has_arg = required_argument,
 173                 .flag = NULL,
 174                 .val = 'D'
 175         },
 176         {
 177                 .name = NULL,
 178         }
 179 };
 180
 181 /*
 182  * for sorting the displayed output
 183  */
 184 struct trace {
 185         struct blk_io_trace *bit;
 186         struct rb_node rb_node;
 187         struct trace *next;
 188 };
 189
 190 static struct rb_root rb_sort_root;
 191 static unsigned long rb_sort_entries;
 192
 193 static struct trace *trace_list;
 194
 195 /*
 196  * allocation cache
 197  */
 198 static struct blk_io_trace *bit_alloc_list;
 199 static struct trace *t_alloc_list;
 200
 201 /*
 202  * for tracking individual ios
 203  */
 204 struct io_track {
 205         struct rb_node rb_node;
 206
 207         __u64 sector;
 208         __u32 pid;
 209         char comm[16];
 210         unsigned long long allocation_time;
 211         unsigned long long queue_time;
 212         unsigned long long dispatch_time;
 213         unsigned long long completion_time;
 214 };
 215
 216 static int ndevices;
 217 static struct per_dev_info *devices;
 218 static char *get_dev_name(struct per_dev_info *, char *, int);
 219
 220 FILE *ofp = NULL;
 221 static char *output_name;
 222 static char *input_dir;
 223
 224 static unsigned long long genesis_time;
 225 static unsigned long long last_allowed_time;
 226 static unsigned int smallest_seq_read;
 227 static unsigned long long stopwatch_start;      /* start from zero by default */
 228 static unsigned long long stopwatch_end = ULONG_LONG_MAX;       /* "infinity" */
 229
 230 static int per_process_stats;
 231 static int per_device_and_cpu_stats = 1;
 232 static int track_ios;
 233 static int ppi_hash_by_pid = 1;
 234 static int verbose;
 235 static unsigned int act_mask = -1U;
 236 static int stats_printed;
 237
 238 static unsigned int t_alloc_cache;
 239 static unsigned int bit_alloc_cache;
 240
 241 #define RB_BATCH_DEFAULT        (512)
 242 static unsigned int rb_batch = RB_BATCH_DEFAULT;
 243
 244 static int pipeline;
 245
 246 #define is_done()       (*(volatile int *)(&done))
 247 static volatile int done;
 248
 249 #define JHASH_RANDOM    (0x3af5f2ee)
 250
 251 static inline int ppi_hash_pid(__u32 pid)
 252 {
 253         return jhash_1word(pid, JHASH_RANDOM) & PPI_HASH_MASK;
 254 }
 255
 256 static inline int ppi_hash_name(const char *name)
 257 {
 258         return jhash(name, 16, JHASH_RANDOM) & PPI_HASH_MASK;
 259 }
 260
 261 static inline int ppi_hash(struct per_process_info *ppi)
 262 {
 263         if (ppi_hash_by_pid)
 264                 return ppi_hash_pid(ppi->pid);
 265
 266         return ppi_hash_name(ppi->name);
 267 }
 268
 269 static inline void add_process_to_hash(struct per_process_info *ppi)
 270 {
 271         const int hash_idx = ppi_hash(ppi);
 272
 273         ppi->hash_next = ppi_hash_table[hash_idx];
 274         ppi_hash_table[hash_idx] = ppi;
 275 }
 276
 277 static inline void add_process_to_list(struct per_process_info *ppi)
 278 {
 279         ppi->list_next = ppi_list;
 280         ppi_list = ppi;
 281         ppi_list_entries++;
 282 }
 283
 284 static struct per_process_info *find_process_by_name(char *name)
 285 {
 286         const int hash_idx = ppi_hash_name(name);
 287         struct per_process_info *ppi;
 288
 289         ppi = ppi_hash_table[hash_idx];
 290         while (ppi) {
 291                 if (!strcmp(ppi->name, name))
 292                         return ppi;
 293
 294                 ppi = ppi->hash_next;
 295         }
 296
 297         return NULL;
 298 }
 299
 300 static struct per_process_info *find_process_by_pid(__u32 pid)
 301 {
 302         const int hash_idx = ppi_hash_pid(pid);
 303         struct per_process_info *ppi;
 304
 305         ppi = ppi_hash_table[hash_idx];
 306         while (ppi) {
 307                 if (ppi->pid == pid)
 308                         return ppi;
 309
 310                 ppi = ppi->hash_next;
 311         }
 312
 313         return NULL;
 314 }
 315
 316 static struct per_process_info *find_process(__u32 pid, char *name)
 317 {
 318         struct per_process_info *ppi;
 319
 320         if (ppi_hash_by_pid)
 321                 return find_process_by_pid(pid);
 322
 323         ppi = find_process_by_name(name);
 324         if (ppi && ppi->pid != pid)
 325                 ppi->more_than_one = 1;
 326
 327         return ppi;
 328 }
 329
 330 static inline int trace_rb_insert(struct trace *t, struct rb_root *root,
 331                                   int check_time)
 332 {
 333         struct rb_node **p = &root->rb_node;
 334         struct rb_node *parent = NULL;
 335         struct trace *__t;
 336
 337         while (*p) {
 338                 parent = *p;
 339
 340                 __t = rb_entry(parent, struct trace, rb_node);
 341
 342                 if (check_time) {
 343                         if (t->bit->time < __t->bit->time) {
 344                                 p = &(*p)->rb_left;
 345                                 continue;
 346                         } else if (t->bit->time > __t->bit->time) {
 347                                 p = &(*p)->rb_right;
 348                                 continue;
 349                         }
 350                 }
 351                 if (t->bit->device < __t->bit->device)
 352                         p = &(*p)->rb_left;
 353                 else if (t->bit->device > __t->bit->device)
 354                         p = &(*p)->rb_right;
 355                 else if (t->bit->sequence < __t->bit->sequence)
 356                         p = &(*p)->rb_left;
 357                 else    /* >= sequence */
 358                         p = &(*p)->rb_right;
 359         }
 360
 361         rb_link_node(&t->rb_node, parent, p);
 362         rb_insert_color(&t->rb_node, root);
 363         return 0;
 364 }
 365
 366 static inline int trace_rb_insert_sort(struct trace *t)
 367 {
 368         if (!trace_rb_insert(t, &rb_sort_root, 1)) {
 369                 rb_sort_entries++;
 370                 return 0;
 371         }
 372
 373         return 1;
 374 }
 375
 376 static inline int trace_rb_insert_last(struct per_dev_info *pdi,struct trace *t)
 377 {
 378         if (!trace_rb_insert(t, &pdi->rb_last, 1)) {
 379                 pdi->rb_last_entries++;
 380                 return 0;
 381         }
 382
 383         return 1;
 384 }
 385
 386 static struct trace *trace_rb_find(dev_t device, unsigned long sequence,
 387                                    struct rb_root *root, int order)
 388 {
 389         struct rb_node *n = root->rb_node;
 390         struct rb_node *prev = NULL;
 391         struct trace *__t;
 392
 393         while (n) {
 394                 __t = rb_entry(n, struct trace, rb_node);
 395                 prev = n;
 396
 397                 if (device < __t->bit->device)
 398                         n = n->rb_left;
 399                 else if (device > __t->bit->device)
 400                         n = n->rb_right;
 401                 else if (sequence < __t->bit->sequence)
 402                         n = n->rb_left;
 403                 else if (sequence > __t->bit->sequence)
 404                         n = n->rb_right;
 405                 else
 406                         return __t;
 407         }
 408
 409         /*
 410          * hack - the list may not be sequence ordered because some
 411          * events don't have sequence and time matched. so we end up
 412          * being a little off in the rb lookup here, because we don't
 413          * know the time we are looking for. compensate by browsing
 414          * a little ahead from the last entry to find the match
 415          */
 416         if (order && prev) {
 417                 int max = 5;
 418
 419                 while (((n = rb_next(prev)) != NULL) && max--) {
 420                         __t = rb_entry(n, struct trace, rb_node);
 421
 422                         if (__t->bit->device == device &&
 423                             __t->bit->sequence == sequence)
 424                                 return __t;
 425
 426                         prev = n;
 427                 }
 428         }
 429
 430         return NULL;
 431 }
 432
 433 static inline struct trace *trace_rb_find_sort(dev_t dev, unsigned long seq)
 434 {
 435         return trace_rb_find(dev, seq, &rb_sort_root, 1);
 436 }
 437
 438 static inline struct trace *trace_rb_find_last(struct per_dev_info *pdi,
 439                                                unsigned long seq)
 440 {
 441         return trace_rb_find(pdi->dev, seq, &pdi->rb_last, 0);
 442 }
 443
 444 static inline int track_rb_insert(struct per_dev_info *pdi,struct io_track *iot)
 445 {
 446         struct rb_node **p = &pdi->rb_track.rb_node;
 447         struct rb_node *parent = NULL;
 448         struct io_track *__iot;
 449
 450         while (*p) {
 451                 parent = *p;
 452                 __iot = rb_entry(parent, struct io_track, rb_node);
 453
 454                 if (iot->sector < __iot->sector)
 455                         p = &(*p)->rb_left;
 456                 else if (iot->sector > __iot->sector)
 457                         p = &(*p)->rb_right;
 458                 else {
 459                         fprintf(stderr,
 460                                 "sector alias (%Lu) on device %d,%d!\n",
 461                                 (unsigned long long) iot->sector,
 462                                 MAJOR(pdi->dev), MINOR(pdi->dev));
 463                         return 1;
 464                 }
 465         }
 466
 467         rb_link_node(&iot->rb_node, parent, p);
 468         rb_insert_color(&iot->rb_node, &pdi->rb_track);
 469         return 0;
 470 }
 471
 472 static struct io_track *__find_track(struct per_dev_info *pdi, __u64 sector)
 473 {
 474         struct rb_node *n = pdi->rb_track.rb_node;
 475         struct io_track *__iot;
 476
 477         while (n) {
 478                 __iot = rb_entry(n, struct io_track, rb_node);
 479
 480                 if (sector < __iot->sector)
 481                         n = n->rb_left;
 482                 else if (sector > __iot->sector)
 483                         n = n->rb_right;
 484                 else
 485                         return __iot;
 486         }
 487
 488         return NULL;
 489 }
 490
 491 static struct io_track *find_track(struct per_dev_info *pdi, __u32 pid,
 492                                    char *comm, __u64 sector)
 493 {
 494         struct io_track *iot;
 495
 496         iot = __find_track(pdi, sector);
 497         if (!iot) {
 498                 iot = malloc(sizeof(*iot));
 499                 iot->pid = pid;
 500                 memcpy(iot->comm, comm, sizeof(iot->comm));
 501                 iot->sector = sector;
 502                 track_rb_insert(pdi, iot);
 503         }
 504
 505         return iot;
 506 }
 507
 508 static void log_track_frontmerge(struct per_dev_info *pdi,
 509                                  struct blk_io_trace *t)
 510 {
 511         struct io_track *iot;
 512
 513         if (!track_ios)
 514                 return;
 515
 516         iot = __find_track(pdi, t->sector + t_sec(t));
 517         if (!iot) {
 518                 if (verbose)
 519                         fprintf(stderr, "merge not found for (%d,%d): %llu\n",
 520                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 521                                 (unsigned long long) t->sector + t_sec(t));
 522                 return;
 523         }
 524
 525         rb_erase(&iot->rb_node, &pdi->rb_track);
 526         iot->sector -= t_sec(t);
 527         track_rb_insert(pdi, iot);
 528 }
 529
 530 static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace *t)
 531 {
 532         struct io_track *iot;
 533
 534         if (!track_ios)
 535                 return;
 536
 537         iot = find_track(pdi, t->pid, t->comm, t->sector);
 538         iot->allocation_time = t->time;
 539 }
 540
 541 /*
 542  * return time between rq allocation and insertion
 543  */
 544 static unsigned long long log_track_insert(struct per_dev_info *pdi,
 545                                            struct blk_io_trace *t)
 546 {
 547         unsigned long long elapsed;
 548         struct io_track *iot;
 549
 550         if (!track_ios)
 551                 return -1;
 552
 553         iot = find_track(pdi, t->pid, t->comm, t->sector);
 554         iot->queue_time = t->time;
 555
 556         if (!iot->allocation_time)
 557                 return -1;
 558
 559         elapsed = iot->queue_time - iot->allocation_time;
 560
 561         if (per_process_stats) {
 562                 struct per_process_info *ppi = find_process(iot->pid,iot->comm);
 563                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 564
 565                 if (ppi && elapsed > ppi->longest_allocation_wait[w])
 566                         ppi->longest_allocation_wait[w] = elapsed;
 567         }
 568
 569         return elapsed;
 570 }
 571
 572 /*
 573  * return time between queue and issue
 574  */
 575 static unsigned long long log_track_issue(struct per_dev_info *pdi,
 576                                           struct blk_io_trace *t)
 577 {
 578         unsigned long long elapsed;
 579         struct io_track *iot;
 580
 581         if (!track_ios)
 582                 return -1;
 583         if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
 584                 return -1;
 585
 586         iot = __find_track(pdi, t->sector);
 587         if (!iot) {
 588                 if (verbose)
 589                         fprintf(stderr, "issue not found for (%d,%d): %llu\n",
 590                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 591                                 (unsigned long long) t->sector);
 592                 return -1;
 593         }
 594
 595         iot->dispatch_time = t->time;
 596         elapsed = iot->dispatch_time - iot->queue_time;
 597
 598         if (per_process_stats) {
 599                 struct per_process_info *ppi = find_process(iot->pid,iot->comm);
 600                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 601
 602                 if (ppi && elapsed > ppi->longest_dispatch_wait[w])
 603                         ppi->longest_dispatch_wait[w] = elapsed;
 604         }
 605
 606         return elapsed;
 607 }
 608
 609 /*
 610  * return time between dispatch and complete
 611  */
 612 static unsigned long long log_track_complete(struct per_dev_info *pdi,
 613                                              struct blk_io_trace *t)
 614 {
 615         unsigned long long elapsed;
 616         struct io_track *iot;
 617
 618         if (!track_ios)
 619                 return -1;
 620         if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
 621                 return -1;
 622
 623         iot = __find_track(pdi, t->sector);
 624         if (!iot) {
 625                 if (verbose)
 626                         fprintf(stderr,"complete not found for (%d,%d): %llu\n",
 627                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 628                                 (unsigned long long) t->sector);
 629                 return -1;
 630         }
 631
 632         iot->completion_time = t->time;
 633         elapsed = iot->completion_time - iot->dispatch_time;
 634
 635         if (per_process_stats) {
 636                 struct per_process_info *ppi = find_process(iot->pid,iot->comm);
 637                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 638
 639                 if (ppi && elapsed > ppi->longest_completion_wait[w])
 640                         ppi->longest_completion_wait[w] = elapsed;
 641         }
 642
 643         /*
 644          * kill the trace, we don't need it after completion
 645          */
 646         rb_erase(&iot->rb_node, &pdi->rb_track);
 647         free(iot);
 648
 649         return elapsed;
 650 }
 651
 652
 653 static struct io_stats *find_process_io_stats(__u32 pid, char *name)
 654 {
 655         struct per_process_info *ppi = find_process(pid, name);
 656
 657         if (!ppi) {
 658                 ppi = malloc(sizeof(*ppi));
 659                 memset(ppi, 0, sizeof(*ppi));
 660                 memcpy(ppi->name, name, 16);
 661                 ppi->pid = pid;
 662                 add_process_to_hash(ppi);
 663                 add_process_to_list(ppi);
 664         }
 665
 666         return &ppi->io_stats;
 667 }
 668
 669 static void resize_cpu_info(struct per_dev_info *pdi, int cpu)
 670 {
 671         struct per_cpu_info *cpus = pdi->cpus;
 672         int ncpus = pdi->ncpus;
 673         int new_count = cpu + 1;
 674         int new_space, size;
 675         char *new_start;
 676
 677         size = new_count * sizeof(struct per_cpu_info);
 678         cpus = realloc(cpus, size);
 679         if (!cpus) {
 680                 char name[20];
 681                 fprintf(stderr, "Out of memory, CPU info for device %s (%d)\n",
 682                         get_dev_name(pdi, name, sizeof(name)), size);
 683                 exit(1);
 684         }
 685
 686         new_start = (char *)cpus + (ncpus * sizeof(struct per_cpu_info));
 687         new_space = (new_count - ncpus) * sizeof(struct per_cpu_info);
 688         memset(new_start, 0, new_space);
 689
 690         pdi->ncpus = new_count;
 691         pdi->cpus = cpus;
 692 }
 693
 694 static struct per_cpu_info *get_cpu_info(struct per_dev_info *pdi, int cpu)
 695 {
 696         struct per_cpu_info *pci;
 697
 698         if (cpu >= pdi->ncpus)
 699                 resize_cpu_info(pdi, cpu);
 700
 701         pci = &pdi->cpus[cpu];
 702         pci->cpu = cpu;
 703         return pci;
 704 }
 705
 706
 707 static int resize_devices(char *name)
 708 {
 709         int size = (ndevices + 1) * sizeof(struct per_dev_info);
 710
 711         devices = realloc(devices, size);
 712         if (!devices) {
 713                 fprintf(stderr, "Out of memory, device %s (%d)\n", name, size);
 714                 return 1;
 715         }
 716         memset(&devices[ndevices], 0, sizeof(struct per_dev_info));
 717         devices[ndevices].name = name;
 718         ndevices++;
 719         return 0;
 720 }
 721
 722 static struct per_dev_info *get_dev_info(dev_t dev)
 723 {
 724         struct per_dev_info *pdi;
 725         int i;
 726
 727         for (i = 0; i < ndevices; i++) {
 728                 if (!devices[i].dev)
 729                         devices[i].dev = dev;
 730                 if (devices[i].dev == dev)
 731                         return &devices[i];
 732         }
 733
 734         if (resize_devices(NULL))
 735                 return NULL;
 736
 737         pdi = &devices[ndevices - 1];
 738         pdi->dev = dev;
 739         pdi->last_sequence = -1;
 740         pdi->last_read_time = 0;
 741         memset(&pdi->rb_last, 0, sizeof(pdi->rb_last));
 742         pdi->rb_last_entries = 0;
 743         return pdi;
 744 }
 745
 746 static char *get_dev_name(struct per_dev_info *pdi, char *buffer, int size)
 747 {
 748         if (pdi->name)
 749                 snprintf(buffer, size, "%s", pdi->name);
 750         else
 751                 snprintf(buffer, size, "%d,%d",MAJOR(pdi->dev),MINOR(pdi->dev));
 752         return buffer;
 753 }
 754
 755 static void check_time(struct per_dev_info *pdi, struct blk_io_trace *bit)
 756 {
 757         unsigned long long this = bit->time;
 758         unsigned long long last = pdi->last_reported_time;
 759
 760         pdi->backwards = (this < last) ? 'B' : ' ';
 761         pdi->last_reported_time = this;
 762 }
 763
 764 static inline void __account_m(struct io_stats *ios, struct blk_io_trace *t,
 765                                int rw)
 766 {
 767         if (rw) {
 768                 ios->mwrites++;
 769                 ios->qwrite_kb += t_kb(t);
 770         } else {
 771                 ios->mreads++;
 772                 ios->qread_kb += t_kb(t);
 773         }
 774 }
 775
 776 static inline void account_m(struct blk_io_trace *t, struct per_cpu_info *pci,
 777                              int rw)
 778 {
 779         __account_m(&pci->io_stats, t, rw);
 780
 781         if (per_process_stats) {
 782                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 783
 784                 __account_m(ios, t, rw);
 785         }
 786 }
 787
 788 static inline void __account_queue(struct io_stats *ios, struct blk_io_trace *t,
 789                                    int rw)
 790 {
 791         if (rw) {
 792                 ios->qwrites++;
 793                 ios->qwrite_kb += t_kb(t);
 794         } else {
 795                 ios->qreads++;
 796                 ios->qread_kb += t_kb(t);
 797         }
 798 }
 799
 800 static inline void account_queue(struct blk_io_trace *t,
 801                                  struct per_cpu_info *pci, int rw)
 802 {
 803         __account_queue(&pci->io_stats, t, rw);
 804
 805         if (per_process_stats) {
 806                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 807
 808                 __account_queue(ios, t, rw);
 809         }
 810 }
 811
 812 static inline void __account_c(struct io_stats *ios, int rw, unsigned int bytes)
 813 {
 814         if (rw) {
 815                 ios->cwrites++;
 816                 ios->cwrite_kb += bytes >> 10;
 817         } else {
 818                 ios->creads++;
 819                 ios->cread_kb += bytes >> 10;
 820         }
 821 }
 822
 823 static inline void account_c(struct blk_io_trace *t, struct per_cpu_info *pci,
 824                              int rw, int bytes)
 825 {
 826         __account_c(&pci->io_stats, rw, bytes);
 827
 828         if (per_process_stats) {
 829                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 830
 831                 __account_c(ios, rw, bytes);
 832         }
 833 }
 834
 835 static inline void __account_issue(struct io_stats *ios, int rw,
 836                                    unsigned int bytes)
 837 {
 838         if (rw) {
 839                 ios->iwrites++;
 840                 ios->iwrite_kb += bytes >> 10;
 841         } else {
 842                 ios->ireads++;
 843                 ios->iread_kb += bytes >> 10;
 844         }
 845 }
 846
 847 static inline void account_issue(struct blk_io_trace *t,
 848                                  struct per_cpu_info *pci, int rw)
 849 {
 850         __account_issue(&pci->io_stats, rw, t->bytes);
 851
 852         if (per_process_stats) {
 853                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 854
 855                 __account_issue(ios, rw, t->bytes);
 856         }
 857 }
 858
 859 static inline void __account_unplug(struct io_stats *ios, int timer)
 860 {
 861         if (timer)
 862                 ios->timer_unplugs++;
 863         else
 864                 ios->io_unplugs++;
 865 }
 866
 867 static inline void account_unplug(struct blk_io_trace *t,
 868                                   struct per_cpu_info *pci, int timer)
 869 {
 870         __account_unplug(&pci->io_stats, timer);
 871
 872         if (per_process_stats) {
 873                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 874
 875                 __account_unplug(ios, timer);
 876         }
 877 }
 878
 879 static void log_complete(struct per_dev_info *pdi, struct per_cpu_info *pci,
 880                          struct blk_io_trace *t, char *act)
 881 {
 882         process_fmt(act, pci, t, log_track_complete(pdi, t), 0, NULL);
 883 }
 884
 885 static void log_insert(struct per_dev_info *pdi, struct per_cpu_info *pci,
 886                        struct blk_io_trace *t, char *act)
 887 {
 888         process_fmt(act, pci, t, log_track_insert(pdi, t), 0, NULL);
 889 }
 890
 891 static void log_queue(struct per_cpu_info *pci, struct blk_io_trace *t,
 892                       char *act)
 893 {
 894         process_fmt(act, pci, t, -1, 0, NULL);
 895 }
 896
 897 static void log_issue(struct per_dev_info *pdi, struct per_cpu_info *pci,
 898                       struct blk_io_trace *t, char *act)
 899 {
 900         process_fmt(act, pci, t, log_track_issue(pdi, t), 0, NULL);
 901 }
 902
 903 static void log_merge(struct per_dev_info *pdi, struct per_cpu_info *pci,
 904                       struct blk_io_trace *t, char *act)
 905 {
 906         if (act[0] == 'F')
 907                 log_track_frontmerge(pdi, t);
 908
 909         process_fmt(act, pci, t, -1ULL, 0, NULL);
 910 }
 911
 912 static void log_action(struct per_cpu_info *pci, struct blk_io_trace *t,
 913                         char *act)
 914 {
 915         process_fmt(act, pci, t, -1ULL, 0, NULL);
 916 }
 917
 918 static void log_generic(struct per_cpu_info *pci, struct blk_io_trace *t,
 919                         char *act)
 920 {
 921         process_fmt(act, pci, t, -1ULL, 0, NULL);
 922 }
 923
 924 static void log_unplug(struct per_cpu_info *pci, struct blk_io_trace *t,
 925                       char *act)
 926 {
 927         process_fmt(act, pci, t, -1ULL, 0, NULL);
 928 }
 929
 930 static void log_split(struct per_cpu_info *pci, struct blk_io_trace *t,
 931                       char *act)
 932 {
 933         process_fmt(act, pci, t, -1ULL, 0, NULL);
 934 }
 935
 936 static void log_pc(struct per_cpu_info *pci, struct blk_io_trace *t, char *act)
 937 {
 938         unsigned char *buf = (unsigned char *) t + sizeof(*t);
 939
 940         process_fmt(act, pci, t, -1ULL, t->pdu_len, buf);
 941 }
 942
 943 static void dump_trace_pc(struct blk_io_trace *t, struct per_cpu_info *pci)
 944 {
 945         int act = t->action & 0xffff;
 946
 947         switch (act) {
 948                 case __BLK_TA_QUEUE:
 949                         log_generic(pci, t, "Q");
 950                         break;
 951                 case __BLK_TA_GETRQ:
 952                         log_generic(pci, t, "G");
 953                         break;
 954                 case __BLK_TA_SLEEPRQ:
 955                         log_generic(pci, t, "S");
 956                         break;
 957                 case __BLK_TA_REQUEUE:
 958                         log_generic(pci, t, "R");
 959                         break;
 960                 case __BLK_TA_ISSUE:
 961                         log_pc(pci, t, "D");
 962                         break;
 963                 case __BLK_TA_COMPLETE:
 964                         log_pc(pci, t, "C");
 965                         break;
 966                 case __BLK_TA_INSERT:
 967                         log_pc(pci, t, "I");
 968                         break;
 969                 default:
 970                         fprintf(stderr, "Bad pc action %x\n", act);
 971                         break;
 972         }
 973 }
 974
 975 static void dump_trace_fs(struct blk_io_trace *t, struct per_dev_info *pdi,
 976                           struct per_cpu_info *pci)
 977 {
 978         int w = t->action & BLK_TC_ACT(BLK_TC_WRITE);
 979         int act = t->action & 0xffff;
 980
 981         switch (act) {
 982                 case __BLK_TA_QUEUE:
 983                         account_queue(t, pci, w);
 984                         log_queue(pci, t, "Q");
 985                         break;
 986                 case __BLK_TA_INSERT:
 987                         log_insert(pdi, pci, t, "I");
 988                         break;
 989                 case __BLK_TA_BACKMERGE:
 990                         account_m(t, pci, w);
 991                         log_merge(pdi, pci, t, "M");
 992                         break;
 993                 case __BLK_TA_FRONTMERGE:
 994                         account_m(t, pci, w);
 995                         log_merge(pdi, pci, t, "F");
 996                         break;
 997                 case __BLK_TA_GETRQ:
 998                         log_track_getrq(pdi, t);
 999                         log_generic(pci, t, "G");
1000                         break;
1001                 case __BLK_TA_SLEEPRQ:
1002                         log_generic(pci, t, "S");
1003                         break;
1004                 case __BLK_TA_REQUEUE:
1005                         account_c(t, pci, w, -t->bytes);
1006                         log_queue(pci, t, "R");
1007                         break;
1008                 case __BLK_TA_ISSUE:
1009                         account_issue(t, pci, w);
1010                         log_issue(pdi, pci, t, "D");
1011                         break;
1012                 case __BLK_TA_COMPLETE:
1013                         account_c(t, pci, w, t->bytes);
1014                         log_complete(pdi, pci, t, "C");
1015                         break;
1016                 case __BLK_TA_PLUG:
1017                         log_action(pci, t, "P");
1018                         break;
1019                 case __BLK_TA_UNPLUG_IO:
1020                         account_unplug(t, pci, 0);
1021                         log_unplug(pci, t, "U");
1022                         break;
1023                 case __BLK_TA_UNPLUG_TIMER:
1024                         account_unplug(t, pci, 1);
1025                         log_unplug(pci, t, "UT");
1026                         break;
1027                 case __BLK_TA_SPLIT:
1028                         log_split(pci, t, "X");
1029                         break;
1030                 case __BLK_TA_BOUNCE:
1031                         log_generic(pci, t, "B");
1032                         break;
1033                 case __BLK_TA_REMAP:
1034                         log_generic(pci, t, "A");
1035                         break;
1036                 default:
1037                         fprintf(stderr, "Bad fs action %x\n", t->action);
1038                         break;
1039         }
1040 }
1041
1042 static void dump_trace(struct blk_io_trace *t, struct per_cpu_info *pci,
1043                        struct per_dev_info *pdi)
1044 {
1045         if (t->action & BLK_TC_ACT(BLK_TC_PC))
1046                 dump_trace_pc(t, pci);
1047         else
1048                 dump_trace_fs(t, pdi, pci);
1049
1050         pdi->events++;
1051 }
1052
1053 static void dump_io_stats(struct io_stats *ios, char *msg)
1054 {
1055         fprintf(ofp, "%s\n", msg);
1056
1057         fprintf(ofp, " Reads Queued:    %'8lu, %'8LuKiB\t", ios->qreads, ios->qread_kb);
1058         fprintf(ofp, " Writes Queued:    %'8lu, %'8LuKiB\n", ios->qwrites,ios->qwrite_kb);
1059
1060         fprintf(ofp, " Read Dispatches: %'8lu, %'8LuKiB\t", ios->ireads, ios->iread_kb);
1061         fprintf(ofp, " Write Dispatches: %'8lu, %'8LuKiB\n", ios->iwrites,ios->iwrite_kb);
1062         fprintf(ofp, " Reads Completed: %'8lu, %'8LuKiB\t", ios->creads, ios->cread_kb);
1063         fprintf(ofp, " Writes Completed: %'8lu, %'8LuKiB\n", ios->cwrites,ios->cwrite_kb);
1064         fprintf(ofp, " Read Merges:     %'8lu%8c\t", ios->mreads, ' ');
1065         fprintf(ofp, " Write Merges:     %'8lu\n", ios->mwrites);
1066         fprintf(ofp, " IO unplugs:      %'8lu%8c\t", ios->io_unplugs, ' ');
1067         fprintf(ofp, " Timer unplugs:    %'8lu\n", ios->timer_unplugs);
1068 }
1069
1070 static void dump_wait_stats(struct per_process_info *ppi)
1071 {
1072         unsigned long rawait = ppi->longest_allocation_wait[0] / 1000;
1073         unsigned long rdwait = ppi->longest_dispatch_wait[0] / 1000;
1074         unsigned long rcwait = ppi->longest_completion_wait[0] / 1000;
1075         unsigned long wawait = ppi->longest_allocation_wait[1] / 1000;
1076         unsigned long wdwait = ppi->longest_dispatch_wait[1] / 1000;
1077         unsigned long wcwait = ppi->longest_completion_wait[1] / 1000;
1078
1079         fprintf(ofp, " Allocation wait: %'8lu%8c\t", rawait, ' ');
1080         fprintf(ofp, " Allocation wait:  %'8lu\n", wawait);
1081         fprintf(ofp, " Dispatch wait:   %'8lu%8c\t", rdwait, ' ');
1082         fprintf(ofp, " Dispatch wait:    %'8lu\n", wdwait);
1083         fprintf(ofp, " Completion wait: %'8lu%8c\t", rcwait, ' ');
1084         fprintf(ofp, " Completion wait:  %'8lu\n", wcwait);
1085 }
1086
1087 static int ppi_name_compare(const void *p1, const void *p2)
1088 {
1089         struct per_process_info *ppi1 = *((struct per_process_info **) p1);
1090         struct per_process_info *ppi2 = *((struct per_process_info **) p2);
1091         int res;
1092
1093         res = strverscmp(ppi1->name, ppi2->name);
1094         if (!res)
1095                 res = ppi1->pid > ppi2->pid;
1096
1097         return res;
1098 }
1099
1100 static void sort_process_list(void)
1101 {
1102         struct per_process_info **ppis;
1103         struct per_process_info *ppi;
1104         int i = 0;
1105
1106         ppis = malloc(ppi_list_entries * sizeof(struct per_process_info *));
1107
1108         ppi = ppi_list;
1109         while (ppi) {
1110                 ppis[i++] = ppi;
1111                 ppi = ppi->list_next;
1112         }
1113
1114         qsort(ppis, ppi_list_entries, sizeof(ppi), ppi_name_compare);
1115
1116         i = ppi_list_entries - 1;
1117         ppi_list = NULL;
1118         while (i >= 0) {
1119                 ppi = ppis[i];
1120
1121                 ppi->list_next = ppi_list;
1122                 ppi_list = ppi;
1123                 i--;
1124         }
1125
1126         free(ppis);
1127 }
1128
1129 static void show_process_stats(void)
1130 {
1131         struct per_process_info *ppi;
1132
1133         sort_process_list();
1134
1135         ppi = ppi_list;
1136         while (ppi) {
1137                 char name[64];
1138
1139                 if (ppi->more_than_one)
1140                         sprintf(name, "%s (%u, ...)", ppi->name, ppi->pid);
1141                 else
1142                         sprintf(name, "%s (%u)", ppi->name, ppi->pid);
1143
1144                 dump_io_stats(&ppi->io_stats, name);
1145                 dump_wait_stats(ppi);
1146                 ppi = ppi->list_next;
1147         }
1148
1149         fprintf(ofp, "\n");
1150 }
1151
1152 static void show_device_and_cpu_stats(void)
1153 {
1154         struct per_dev_info *pdi;
1155         struct per_cpu_info *pci;
1156         struct io_stats total, *ios;
1157         int i, j, pci_events;
1158         char line[3 + 8/*cpu*/ + 2 + 32/*dev*/ + 3];
1159         char name[32];
1160
1161         for (pdi = devices, i = 0; i < ndevices; i++, pdi++) {
1162
1163                 memset(&total, 0, sizeof(total));
1164                 pci_events = 0;
1165
1166                 if (i > 0)
1167                         fprintf(ofp, "\n");
1168
1169                 for (pci = pdi->cpus, j = 0; j < pdi->ncpus; j++, pci++) {
1170                         if (!pci->nelems)
1171                                 continue;
1172
1173                         ios = &pci->io_stats;
1174                         total.qreads += ios->qreads;
1175                         total.qwrites += ios->qwrites;
1176                         total.creads += ios->creads;
1177                         total.cwrites += ios->cwrites;
1178                         total.mreads += ios->mreads;
1179                         total.mwrites += ios->mwrites;
1180                         total.ireads += ios->ireads;
1181                         total.iwrites += ios->iwrites;
1182                         total.qread_kb += ios->qread_kb;
1183                         total.qwrite_kb += ios->qwrite_kb;
1184                         total.cread_kb += ios->cread_kb;
1185                         total.cwrite_kb += ios->cwrite_kb;
1186                         total.iread_kb += ios->iread_kb;
1187                         total.iwrite_kb += ios->iwrite_kb;
1188                         total.timer_unplugs += ios->timer_unplugs;
1189                         total.io_unplugs += ios->io_unplugs;
1190
1191                         snprintf(line, sizeof(line) - 1, "CPU%d (%s):",
1192                                  j, get_dev_name(pdi, name, sizeof(name)));
1193                         dump_io_stats(ios, line);
1194                         pci_events++;
1195                 }
1196
1197                 if (pci_events > 1) {
1198                         fprintf(ofp, "\n");
1199                         snprintf(line, sizeof(line) - 1, "Total (%s):",
1200                                  get_dev_name(pdi, name, sizeof(name)));
1201                         dump_io_stats(&total, line);
1202                 }
1203
1204                 fprintf(ofp, "\nEvents (%s): %'Lu entries, %'lu skips\n",
1205                         get_dev_name(pdi, line, sizeof(line)), pdi->events,
1206                         pdi->skips);
1207         }
1208 }
1209
1210 /*
1211  * struct trace and blktrace allocation cache, we do potentially
1212  * millions of mallocs for these structures while only using at most
1213  * a few thousand at the time
1214  */
1215 static inline void t_free(struct trace *t)
1216 {
1217         if (t_alloc_cache < 1024) {
1218                 t->next = t_alloc_list;
1219                 t_alloc_list = t;
1220                 t_alloc_cache++;
1221         } else
1222                 free(t);
1223 }
1224
1225 static inline struct trace *t_alloc(void)
1226 {
1227         struct trace *t = t_alloc_list;
1228
1229         if (t) {
1230                 t_alloc_list = t->next;
1231                 t_alloc_cache--;
1232                 return t;
1233         }
1234
1235         return malloc(sizeof(*t));
1236 }
1237
1238 static inline void bit_free(struct blk_io_trace *bit)
1239 {
1240         if (bit_alloc_cache < 1024) {
1241                 /*
1242                  * abuse a 64-bit field for a next pointer for the free item
1243                  */
1244                 bit->time = (__u64) (unsigned long) bit_alloc_list;
1245                 bit_alloc_list = (struct blk_io_trace *) bit;
1246                 bit_alloc_cache++;
1247         } else
1248                 free(bit);
1249 }
1250
1251 static inline struct blk_io_trace *bit_alloc(void)
1252 {
1253         struct blk_io_trace *bit = bit_alloc_list;
1254
1255         if (bit) {
1256                 bit_alloc_list = (struct blk_io_trace *) (unsigned long) \
1257                                  bit->time;
1258                 bit_alloc_cache--;
1259                 return bit;
1260         }
1261
1262         return malloc(sizeof(*bit));
1263 }
1264
1265 static void find_genesis(void)
1266 {
1267         struct trace *t = trace_list;
1268
1269         genesis_time = -1ULL;
1270         while (t != NULL) {
1271                 if (t->bit->time < genesis_time)
1272                         genesis_time = t->bit->time;
1273
1274                 t = t->next;
1275         }
1276 }
1277
1278 static inline int check_stopwatch(struct blk_io_trace *bit)
1279 {
1280         if (bit->time < stopwatch_end &&
1281             bit->time >= stopwatch_start)
1282                 return 0;
1283
1284         return 1;
1285 }
1286
1287 /*
1288  * return youngest entry read
1289  */
1290 static int sort_entries(unsigned long long *youngest)
1291 {
1292         struct trace *t;
1293
1294         if (!genesis_time)
1295                 find_genesis();
1296
1297         *youngest = 0;
1298         while ((t = trace_list) != NULL) {
1299                 struct blk_io_trace *bit = t->bit;
1300
1301                 trace_list = t->next;
1302
1303                 bit->time -= genesis_time;
1304
1305                 if (bit->time < *youngest || !*youngest)
1306                         *youngest = bit->time;
1307
1308                 if (check_stopwatch(bit)) {
1309                         bit_free(bit);
1310                         t_free(t);
1311                         continue;
1312                 }
1313
1314                 if (trace_rb_insert_sort(t))
1315                         return -1;
1316
1317                 if (bit->sequence < smallest_seq_read)
1318                         smallest_seq_read = bit->sequence;
1319         }
1320
1321         return 0;
1322 }
1323
1324 static inline void __put_trace_last(struct per_dev_info *pdi, struct trace *t)
1325 {
1326         rb_erase(&t->rb_node, &pdi->rb_last);
1327         pdi->rb_last_entries--;
1328
1329         bit_free(t->bit);
1330         t_free(t);
1331 }
1332
1333 static void put_trace(struct per_dev_info *pdi, struct trace *t)
1334 {
1335         rb_erase(&t->rb_node, &rb_sort_root);
1336         rb_sort_entries--;
1337
1338         trace_rb_insert_last(pdi, t);
1339
1340         if (pdi->rb_last_entries > rb_batch * pdi->nfiles) {
1341                 struct rb_node *n = rb_first(&pdi->rb_last);
1342
1343                 t = rb_entry(n, struct trace, rb_node);
1344                 __put_trace_last(pdi, t);
1345         }
1346 }
1347
1348 static int check_sequence(struct per_dev_info *pdi, struct trace *t, int force)
1349 {
1350         unsigned long expected_sequence = pdi->last_sequence + 1;
1351         struct blk_io_trace *bit = t->bit;
1352         struct trace *__t;
1353
1354         /*
1355          * first entry, always ok
1356          */
1357         if (!expected_sequence)
1358                 return 0;
1359
1360         if (bit->sequence == expected_sequence)
1361                 return 0;
1362
1363         /*
1364          * we may not have seen that sequence yet. if we are not doing
1365          * the final run, break and wait for more entries.
1366          */
1367         if (expected_sequence < smallest_seq_read) {
1368                 __t = trace_rb_find_last(pdi, expected_sequence);
1369                 if (!__t)
1370                         goto skip;
1371
1372                 __put_trace_last(pdi, __t);
1373                 return 0;
1374         } else if (!force) {
1375                 return 1;
1376         } else {
1377 skip:
1378                 if (verbose) {
1379                         fprintf(stderr, "(%d,%d): skipping %lu -> %u\n",
1380                                 MAJOR(pdi->dev), MINOR(pdi->dev),
1381                                 pdi->last_sequence, bit->sequence);
1382                 }
1383                 pdi->skips++;
1384                 return 0;
1385         }
1386 }
1387
1388 static void show_entries_rb(int force)
1389 {
1390         struct per_dev_info *pdi = NULL;
1391         struct per_cpu_info *pci = NULL;
1392         struct blk_io_trace *bit;
1393         struct rb_node *n;
1394         struct trace *t;
1395
1396         while ((n = rb_first(&rb_sort_root)) != NULL) {
1397                 if (is_done() && !force && !pipeline)
1398                         break;
1399
1400                 t = rb_entry(n, struct trace, rb_node);
1401                 bit = t->bit;
1402
1403                 if (!pdi || pdi->dev != bit->device)
1404                         pdi = get_dev_info(bit->device);
1405
1406                 if (!pdi) {
1407                         fprintf(stderr, "Unknown device ID? (%d,%d)\n",
1408                                 MAJOR(bit->device), MINOR(bit->device));
1409                         break;
1410                 }
1411
1412                 if (check_sequence(pdi, t, force))
1413                         break;
1414
1415                 if (!force && bit->time > last_allowed_time)
1416                         break;
1417
1418                 pdi->last_sequence = bit->sequence;
1419
1420                 check_time(pdi, bit);
1421
1422                 if (!pci || pci->cpu != bit->cpu)
1423                         pci = get_cpu_info(pdi, bit->cpu);
1424
1425                 pci->nelems++;
1426
1427                 if (bit->action & (act_mask << BLK_TC_SHIFT))
1428                         dump_trace(bit, pci, pdi);
1429
1430                 put_trace(pdi, t);
1431         }
1432 }
1433
1434 static int read_data(int fd, void *buffer, int bytes, int block)
1435 {
1436         int ret, bytes_left, fl;
1437         void *p;
1438
1439         fl = fcntl(fd, F_GETFL);
1440
1441         if (!block)
1442                 fcntl(fd, F_SETFL, fl | O_NONBLOCK);
1443         else
1444                 fcntl(fd, F_SETFL, fl & ~O_NONBLOCK);
1445
1446         bytes_left = bytes;
1447         p = buffer;
1448         while (bytes_left > 0) {
1449                 ret = read(fd, p, bytes_left);
1450                 if (!ret)
1451                         return 1;
1452                 else if (ret < 0) {
1453                         if (errno != EAGAIN)
1454                                 perror("read");
1455
1456                         return -1;
1457                 } else {
1458                         p += ret;
1459                         bytes_left -= ret;
1460                 }
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int read_events(int fd, int always_block)
1467 {
1468         struct per_dev_info *pdi = NULL;
1469         unsigned int events = 0;
1470
1471         while (!is_done() && events < rb_batch) {
1472                 struct blk_io_trace *bit;
1473                 struct trace *t;
1474                 int pdu_len;
1475                 __u32 magic;
1476
1477                 bit = bit_alloc();
1478
1479                 if (read_data(fd, bit, sizeof(*bit), !events || always_block))
1480                         break;
1481
1482                 magic = be32_to_cpu(bit->magic);
1483                 if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
1484                         fprintf(stderr, "Bad magic %x\n", magic);
1485                         break;
1486                 }
1487
1488                 pdu_len = be16_to_cpu(bit->pdu_len);
1489                 if (pdu_len) {
1490                         void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
1491
1492                         if (read_data(fd, ptr + sizeof(*bit), pdu_len, 1))
1493                                 break;
1494
1495                         bit = ptr;
1496                 }
1497
1498                 trace_to_cpu(bit);
1499
1500                 if (verify_trace(bit)) {
1501                         bit_free(bit);
1502                         continue;
1503                 }
1504
1505                 t = t_alloc();
1506                 memset(t, 0, sizeof(*t));
1507                 t->bit = bit;
1508
1509                 t->next = trace_list;
1510                 trace_list = t;
1511
1512                 if (!pdi || pdi->dev != bit->device)
1513                         pdi = get_dev_info(bit->device);
1514
1515                 if (bit->time > pdi->last_read_time)
1516                         pdi->last_read_time = bit->time;
1517
1518                 events++;
1519         }
1520
1521         return events;
1522 }
1523
1524 static int do_file(void)
1525 {
1526         struct per_cpu_info *pci;
1527         struct per_dev_info *pdi;
1528         int i, j, events, events_added;
1529
1530         /*
1531          * first prepare all files for reading
1532          */
1533         for (i = 0; i < ndevices; i++) {
1534                 pdi = &devices[i];
1535                 pdi->nfiles = 0;
1536                 pdi->last_sequence = -1;
1537
1538                 for (j = 0;; j++) {
1539                         struct stat st;
1540                         int len = 0;
1541
1542                         pci = get_cpu_info(pdi, j);
1543                         pci->cpu = j;
1544                         pci->fd = -1;
1545
1546                         if (input_dir)
1547                                 len = sprintf(pci->fname, "%s/", input_dir);
1548
1549                         snprintf(pci->fname + len, sizeof(pci->fname)-1-len,
1550                                  "%s.blktrace.%d", pdi->name, pci->cpu);
1551                         if (stat(pci->fname, &st) < 0)
1552                                 break;
1553                         if (st.st_size) {
1554                                 pci->fd = open(pci->fname, O_RDONLY);
1555                                 if (pci->fd < 0) {
1556                                         perror(pci->fname);
1557                                         continue;
1558                                 }
1559                         }
1560
1561                         printf("Input file %s added\n", pci->fname);
1562                         pdi->nfiles++;
1563                 }
1564         }
1565
1566         /*
1567          * now loop over the files reading in the data
1568          */
1569         do {
1570                 unsigned long long youngest;
1571
1572                 events_added = 0;
1573                 last_allowed_time = -1ULL;
1574                 smallest_seq_read = -1U;
1575
1576                 for (i = 0; i < ndevices; i++) {
1577                         pdi = &devices[i];
1578
1579                         for (j = 0; j < pdi->nfiles; j++) {
1580
1581                                 pci = get_cpu_info(pdi, j);
1582
1583                                 if (pci->fd == -1)
1584                                         continue;
1585
1586                                 events = read_events(pci->fd, 1);
1587                                 if (!events) {
1588                                         close(pci->fd);
1589                                         pci->fd = -1;
1590                                         continue;
1591                                 }
1592
1593                                 if (pdi->last_read_time < last_allowed_time)
1594                                         last_allowed_time = pdi->last_read_time;
1595
1596                                 events_added += events;
1597                         }
1598                 }
1599
1600                 if (sort_entries(&youngest))
1601                         break;
1602
1603                 if (youngest > stopwatch_end)
1604                         break;
1605
1606                 show_entries_rb(0);
1607
1608         } while (events_added);
1609
1610         if (rb_sort_entries)
1611                 show_entries_rb(1);
1612
1613         return 0;
1614 }
1615
1616 static int do_stdin(void)
1617 {
1618         unsigned long long youngest;
1619         int fd, events;
1620
1621         last_allowed_time = -1ULL;
1622         fd = dup(STDIN_FILENO);
1623         if (fd == -1) {
1624                 perror("dup stdin");
1625                 return -1;
1626         }
1627
1628         while ((events = read_events(fd, 0)) != 0) {
1629
1630                 smallest_seq_read = -1U;
1631
1632                 if (sort_entries(&youngest))
1633                         break;
1634
1635                 if (youngest > stopwatch_end)
1636                         break;
1637
1638                 show_entries_rb(0);
1639         }
1640
1641         if (rb_sort_entries)
1642                 show_entries_rb(1);
1643
1644         close(fd);
1645         return 0;
1646 }
1647
1648 static void show_stats(void)
1649 {
1650         if (!ofp)
1651                 return;
1652         if (stats_printed)
1653                 return;
1654
1655         stats_printed = 1;
1656
1657         if (per_process_stats)
1658                 show_process_stats();
1659
1660         if (per_device_and_cpu_stats)
1661                 show_device_and_cpu_stats();
1662
1663         fflush(ofp);
1664 }
1665
1666 static void handle_sigint(__attribute__((__unused__)) int sig)
1667 {
1668         done = 1;
1669         show_stats();
1670 }
1671
1672 /*
1673  * Extract start and duration times from a string, allowing
1674  * us to specify a time interval of interest within a trace.
1675  * Format: "duration" (start is zero) or "start:duration".
1676  */
1677 static int find_stopwatch_interval(char *string)
1678 {
1679         double value;
1680         char *sp;
1681
1682         value = strtod(string, &sp);
1683         if (sp == string) {
1684                 fprintf(stderr,"Invalid stopwatch timer: %s\n", string);
1685                 return 1;
1686         }
1687         if (*sp == ':') {
1688                 stopwatch_start = DOUBLE_TO_NANO_ULL(value);
1689                 string = sp + 1;
1690                 value = strtod(string, &sp);
1691                 if (sp == string || *sp != '\0') {
1692                         fprintf(stderr,"Invalid stopwatch duration time: %s\n",
1693                                 string);
1694                         return 1;
1695                 }
1696         } else if (*sp != '\0') {
1697                 fprintf(stderr,"Invalid stopwatch start timer: %s\n", string);
1698                 return 1;
1699         }
1700         stopwatch_end = DOUBLE_TO_NANO_ULL(value);
1701         if (stopwatch_end <= stopwatch_start) {
1702                 fprintf(stderr, "Invalid stopwatch interval: %Lu -> %Lu\n",
1703                         stopwatch_start, stopwatch_end);
1704                 return 1;
1705         }
1706
1707         return 0;
1708 }
1709
1710 static char usage_str[] = \
1711         "[ -i <input name> ] [-o <output name> [ -s ] [ -t ] [ -q ]\n" \
1712         "[ -w start:stop ] [ -f output format ] [ -F format spec ] [ -v] \n\n" \
1713         "\t-i Input file containing trace data, or '-' for stdin\n" \
1714         "\t-D Directory to prepend to input file names\n" \
1715         "\t-o Output file. If not given, output is stdout\n" \
1716         "\t-b stdin read batching\n" \
1717         "\t-s Show per-program io statistics\n" \
1718         "\t-n Hash processes by name, not pid\n" \
1719         "\t-t Track individual ios. Will tell you the time a request took\n" \
1720         "\t   to get queued, to get dispatched, and to get completed\n" \
1721         "\t-q Quiet. Don't display any stats at the end of the trace\n" \
1722         "\t-w Only parse data between the given time interval in seconds.\n" \
1723         "\t   If 'start' isn't given, blkparse defaults the start time to 0\n" \
1724         "\t -f Output format. Customize the output format. The format field\n" \
1725         "\t    identifies can be found in the documentation\n" \
1726         "\t-F Format specification. Can be found in the documentation\n" \
1727         "\t-v More verbose for marginal errors\n" \
1728         "\t-V Print program version info\n\n";
1729
1730 static void usage(char *prog)
1731 {
1732         fprintf(stderr, "Usage: %s %s %s", prog, blkparse_version, usage_str);
1733 }
1734
1735 int main(int argc, char *argv[])
1736 {
1737         char *ofp_buffer;
1738         int i, c, ret, mode;
1739         int act_mask_tmp = 0;
1740
1741         while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) != -1) {
1742                 switch (c) {
1743                 case 'a':
1744                         i = find_mask_map(optarg);
1745                         if (i < 0) {
1746                                 fprintf(stderr,"Invalid action mask %s\n",
1747                                         optarg);
1748                                 return 1;
1749                         }
1750                         act_mask_tmp |= i;
1751                         break;
1752
1753                 case 'A':
1754                         if ((sscanf(optarg, "%x", &i) != 1) ||
1755                                                         !valid_act_opt(i)) {
1756                                 fprintf(stderr,
1757                                         "Invalid set action mask %s/0x%x\n",
1758                                         optarg, i);
1759                                 return 1;
1760                         }
1761                         act_mask_tmp = i;
1762                         break;
1763                 case 'i':
1764                         if (!strcmp(optarg, "-") && !pipeline)
1765                                 pipeline = 1;
1766                         else if (resize_devices(optarg) != 0)
1767                                 return 1;
1768                         break;
1769                 case 'D':
1770                         input_dir = optarg;
1771                         break;
1772                 case 'o':
1773                         output_name = optarg;
1774                         break;
1775                 case 'b':
1776                         rb_batch = atoi(optarg);
1777                         if (rb_batch <= 0)
1778                                 rb_batch = RB_BATCH_DEFAULT;
1779                         break;
1780                 case 's':
1781                         per_process_stats = 1;
1782                         break;
1783                 case 't':
1784                         track_ios = 1;
1785                         break;
1786                 case 'q':
1787                         per_device_and_cpu_stats = 0;
1788                         break;
1789                 case 'w':
1790                         if (find_stopwatch_interval(optarg) != 0)
1791                                 return 1;
1792                         break;
1793                 case 'f':
1794                         set_all_format_specs(optarg);
1795                         break;
1796                 case 'F':
1797                         if (add_format_spec(optarg) != 0)
1798                                 return 1;
1799                         break;
1800                 case 'n':
1801                         ppi_hash_by_pid = 0;
1802                         break;
1803                 case 'v':
1804                         verbose++;
1805                         break;
1806                 case 'V':
1807                         printf("%s version %s\n", argv[0], blkparse_version);
1808                         return 0;
1809                 default:
1810                         usage(argv[0]);
1811                         return 1;
1812                 }
1813         }
1814
1815         while (optind < argc) {
1816                 if (!strcmp(argv[optind], "-") && !pipeline)
1817                         pipeline = 1;
1818                 else if (resize_devices(argv[optind]) != 0)
1819                         return 1;
1820                 optind++;
1821         }
1822
1823         if (!pipeline && !ndevices) {
1824                 usage(argv[0]);
1825                 return 1;
1826         }
1827
1828         if (act_mask_tmp != 0)
1829                 act_mask = act_mask_tmp;
1830
1831         memset(&rb_sort_root, 0, sizeof(rb_sort_root));
1832
1833         signal(SIGINT, handle_sigint);
1834         signal(SIGHUP, handle_sigint);
1835         signal(SIGTERM, handle_sigint);
1836
1837         setlocale(LC_NUMERIC, "en_US");
1838
1839         if (!output_name) {
1840                 ofp = fdopen(STDOUT_FILENO, "w");
1841                 mode = _IOLBF;
1842         } else {
1843                 char ofname[128];
1844
1845                 snprintf(ofname, sizeof(ofname) - 1, "%s", output_name);
1846                 ofp = fopen(ofname, "w");
1847                 mode = _IOFBF;
1848         }
1849
1850         if (!ofp) {
1851                 perror("fopen");
1852                 return 1;
1853         }
1854
1855         ofp_buffer = malloc(4096);
1856         if (setvbuf(ofp, ofp_buffer, mode, 4096)) {
1857                 perror("setvbuf");
1858                 return 1;
1859         }
1860
1861         if (pipeline)
1862                 ret = do_stdin();
1863         else
1864                 ret = do_file();
1865
1866         show_stats();
1867         return ret;
1868 }