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