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