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