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