blkparse.c

   1 /*
   2  * block queue tracing parse application
   3  *
   4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
   5  * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <getopt.h>
  30 #include <errno.h>
  31 #include <signal.h>
  32 #include <locale.h>
  33 #include <libgen.h>
  34
  35 #include "blktrace.h"
  36 #include "rbtree.h"
  37 #include "jhash.h"
  38
  39 static char blkparse_version[] = "1.2.0";
  40
  41 struct skip_info {
  42         unsigned long start, end;
  43         struct skip_info *prev, *next;
  44 };
  45
  46 struct per_dev_info {
  47         dev_t dev;
  48         char *name;
  49
  50         int backwards;
  51         unsigned long long events;
  52         unsigned long long first_reported_time;
  53         unsigned long long last_reported_time;
  54         unsigned long long last_read_time;
  55         struct io_stats io_stats;
  56         unsigned long skips;
  57         unsigned long long seq_skips;
  58         unsigned int max_depth[2];
  59         unsigned int cur_depth[2];
  60
  61         struct rb_root rb_track;
  62
  63         int nfiles;
  64         int ncpus;
  65
  66         unsigned long *cpu_map;
  67         unsigned int cpu_map_max;
  68
  69         struct per_cpu_info *cpus;
  70 };
  71
  72 /*
  73  * some duplicated effort here, we can unify this hash and the ppi hash later
  74  */
  75 struct process_pid_map {
  76         pid_t pid;
  77         char comm[16];
  78         struct process_pid_map *hash_next, *list_next;
  79 };
  80
  81 #define PPM_HASH_SHIFT  (8)
  82 #define PPM_HASH_SIZE   (1 << PPM_HASH_SHIFT)
  83 #define PPM_HASH_MASK   (PPM_HASH_SIZE - 1)
  84 static struct process_pid_map *ppm_hash_table[PPM_HASH_SIZE];
  85
  86 struct per_process_info {
  87         struct process_pid_map *ppm;
  88         struct io_stats io_stats;
  89         struct per_process_info *hash_next, *list_next;
  90         int more_than_one;
  91
  92         /*
  93          * individual io stats
  94          */
  95         unsigned long long longest_allocation_wait[2];
  96         unsigned long long longest_dispatch_wait[2];
  97         unsigned long long longest_completion_wait[2];
  98 };
  99
 100 #define PPI_HASH_SHIFT  (8)
 101 #define PPI_HASH_SIZE   (1 << PPI_HASH_SHIFT)
 102 #define PPI_HASH_MASK   (PPI_HASH_SIZE - 1)
 103 static struct per_process_info *ppi_hash_table[PPI_HASH_SIZE];
 104 static struct per_process_info *ppi_list;
 105 static int ppi_list_entries;
 106
 107 static struct option l_opts[] = {
 108         {
 109                 .name = "act-mask",
 110                 .has_arg = required_argument,
 111                 .flag = NULL,
 112                 .val = 'a'
 113         },
 114         {
 115                 .name = "set-mask",
 116                 .has_arg = required_argument,
 117                 .flag = NULL,
 118                 .val = 'A'
 119         },
 120         {
 121                 .name = "batch",
 122                 .has_arg = required_argument,
 123                 .flag = NULL,
 124                 .val = 'b'
 125         },
 126         {
 127                 .name = "input-directory",
 128                 .has_arg = required_argument,
 129                 .flag = NULL,
 130                 .val = 'D'
 131         },
 132         {
 133                 .name = "dump-binary",
 134                 .has_arg = required_argument,
 135                 .flag = NULL,
 136                 .val = 'd'
 137         },
 138         {
 139                 .name = "format",
 140                 .has_arg = required_argument,
 141                 .flag = NULL,
 142                 .val = 'f'
 143         },
 144         {
 145                 .name = "format-spec",
 146                 .has_arg = required_argument,
 147                 .flag = NULL,
 148                 .val = 'F'
 149         },
 150         {
 151                 .name = "hash-by-name",
 152                 .has_arg = no_argument,
 153                 .flag = NULL,
 154                 .val = 'h'
 155         },
 156         {
 157                 .name = "input",
 158                 .has_arg = required_argument,
 159                 .flag = NULL,
 160                 .val = 'i'
 161         },
 162         {
 163                 .name = "no-msgs",
 164                 .has_arg = no_argument,
 165                 .flag = NULL,
 166                 .val = 'M'
 167         },
 168         {
 169                 .name = "output",
 170                 .has_arg = required_argument,
 171                 .flag = NULL,
 172                 .val = 'o'
 173         },
 174         {
 175                 .name = "no-text-output",
 176                 .has_arg = no_argument,
 177                 .flag = NULL,
 178                 .val = 'O'
 179         },
 180         {
 181                 .name = "quiet",
 182                 .has_arg = no_argument,
 183                 .flag = NULL,
 184                 .val = 'q'
 185         },
 186         {
 187                 .name = "per-program-stats",
 188                 .has_arg = no_argument,
 189                 .flag = NULL,
 190                 .val = 's'
 191         },
 192         {
 193                 .name = "track-ios",
 194                 .has_arg = no_argument,
 195                 .flag = NULL,
 196                 .val = 't'
 197         },
 198         {
 199                 .name = "stopwatch",
 200                 .has_arg = required_argument,
 201                 .flag = NULL,
 202                 .val = 'w'
 203         },
 204         {
 205                 .name = "verbose",
 206                 .has_arg = no_argument,
 207                 .flag = NULL,
 208                 .val = 'v'
 209         },
 210         {
 211                 .name = "version",
 212                 .has_arg = no_argument,
 213                 .flag = NULL,
 214                 .val = 'V'
 215         },
 216         {
 217                 .name = NULL,
 218         }
 219 };
 220
 221 /*
 222  * for sorting the displayed output
 223  */
 224 struct trace {
 225         struct blk_io_trace *bit;
 226         struct rb_node rb_node;
 227         struct trace *next;
 228         unsigned long read_sequence;
 229 };
 230
 231 static struct rb_root rb_sort_root;
 232 static unsigned long rb_sort_entries;
 233
 234 static struct trace *trace_list;
 235
 236 /*
 237  * allocation cache
 238  */
 239 static struct blk_io_trace *bit_alloc_list;
 240 static struct trace *t_alloc_list;
 241
 242 /*
 243  * for tracking individual ios
 244  */
 245 struct io_track {
 246         struct rb_node rb_node;
 247
 248         struct process_pid_map *ppm;
 249         __u64 sector;
 250         unsigned long long allocation_time;
 251         unsigned long long queue_time;
 252         unsigned long long dispatch_time;
 253         unsigned long long completion_time;
 254 };
 255
 256 static int ndevices;
 257 static struct per_dev_info *devices;
 258 static char *get_dev_name(struct per_dev_info *, char *, int);
 259 static int trace_rb_insert_last(struct per_dev_info *, struct trace *);
 260
 261 FILE *ofp = NULL;
 262 static char *output_name;
 263 static char *input_dir;
 264
 265 static unsigned long long genesis_time;
 266 static unsigned long long last_allowed_time;
 267 static unsigned long long stopwatch_start;      /* start from zero by default */
 268 static unsigned long long stopwatch_end = -1ULL;        /* "infinity" */
 269 static unsigned long read_sequence;
 270
 271 static int per_process_stats;
 272 static int per_device_and_cpu_stats = 1;
 273 static int track_ios;
 274 static int ppi_hash_by_pid = 1;
 275 static int verbose;
 276 static unsigned int act_mask = -1U;
 277 static int stats_printed;
 278 static int bin_output_msgs = 1;
 279 int data_is_native = -1;
 280
 281 static FILE *dump_fp;
 282 static char *dump_binary;
 283
 284 static unsigned int t_alloc_cache;
 285 static unsigned int bit_alloc_cache;
 286
 287 #define RB_BATCH_DEFAULT        (512)
 288 static unsigned int rb_batch = RB_BATCH_DEFAULT;
 289
 290 static int pipeline;
 291 static char *pipename;
 292
 293 static int text_output = 1;
 294
 295 #define is_done()       (*(volatile int *)(&done))
 296 static volatile int done;
 297
 298 struct timespec         abs_start_time;
 299 static unsigned long long start_timestamp;
 300
 301 static int have_drv_data = 0;
 302
 303 #define JHASH_RANDOM    (0x3af5f2ee)
 304
 305 #define CPUS_PER_LONG   (8 * sizeof(unsigned long))
 306 #define CPU_IDX(cpu)    ((cpu) / CPUS_PER_LONG)
 307 #define CPU_BIT(cpu)    ((cpu) & (CPUS_PER_LONG - 1))
 308
 309 static void output_binary(void *buf, int len)
 310 {
 311         if (dump_binary) {
 312                 size_t n = fwrite(buf, len, 1, dump_fp);
 313                 if (n != 1) {
 314                         perror(dump_binary);
 315                         fclose(dump_fp);
 316                         dump_binary = NULL;
 317                 }
 318         }
 319 }
 320
 321 static void resize_cpu_info(struct per_dev_info *pdi, int cpu)
 322 {
 323         struct per_cpu_info *cpus = pdi->cpus;
 324         int ncpus = pdi->ncpus;
 325         int new_count = cpu + 1;
 326         int new_space, size;
 327         char *new_start;
 328
 329         size = new_count * sizeof(struct per_cpu_info);
 330         cpus = realloc(cpus, size);
 331         if (!cpus) {
 332                 char name[20];
 333                 fprintf(stderr, "Out of memory, CPU info for device %s (%d)\n",
 334                         get_dev_name(pdi, name, sizeof(name)), size);
 335                 exit(1);
 336         }
 337
 338         new_start = (char *)cpus + (ncpus * sizeof(struct per_cpu_info));
 339         new_space = (new_count - ncpus) * sizeof(struct per_cpu_info);
 340         memset(new_start, 0, new_space);
 341
 342         pdi->ncpus = new_count;
 343         pdi->cpus = cpus;
 344
 345         for (new_count = 0; new_count < pdi->ncpus; new_count++) {
 346                 struct per_cpu_info *pci = &pdi->cpus[new_count];
 347
 348                 if (!pci->fd) {
 349                         pci->fd = -1;
 350                         memset(&pci->rb_last, 0, sizeof(pci->rb_last));
 351                         pci->rb_last_entries = 0;
 352                         pci->last_sequence = -1;
 353                 }
 354         }
 355 }
 356
 357 static struct per_cpu_info *get_cpu_info(struct per_dev_info *pdi, int cpu)
 358 {
 359         struct per_cpu_info *pci;
 360
 361         if (cpu >= pdi->ncpus)
 362                 resize_cpu_info(pdi, cpu);
 363
 364         pci = &pdi->cpus[cpu];
 365         pci->cpu = cpu;
 366         return pci;
 367 }
 368
 369
 370 static int resize_devices(char *name)
 371 {
 372         int size = (ndevices + 1) * sizeof(struct per_dev_info);
 373
 374         devices = realloc(devices, size);
 375         if (!devices) {
 376                 fprintf(stderr, "Out of memory, device %s (%d)\n", name, size);
 377                 return 1;
 378         }
 379         memset(&devices[ndevices], 0, sizeof(struct per_dev_info));
 380         devices[ndevices].name = name;
 381         ndevices++;
 382         return 0;
 383 }
 384
 385 static struct per_dev_info *get_dev_info(dev_t dev)
 386 {
 387         struct per_dev_info *pdi;
 388         int i;
 389
 390         for (i = 0; i < ndevices; i++) {
 391                 if (!devices[i].dev)
 392                         devices[i].dev = dev;
 393                 if (devices[i].dev == dev)
 394                         return &devices[i];
 395         }
 396
 397         if (resize_devices(NULL))
 398                 return NULL;
 399
 400         pdi = &devices[ndevices - 1];
 401         pdi->dev = dev;
 402         pdi->first_reported_time = 0;
 403         pdi->last_read_time = 0;
 404
 405         return pdi;
 406 }
 407
 408 static void insert_skip(struct per_cpu_info *pci, unsigned long start,
 409                         unsigned long end)
 410 {
 411         struct skip_info *sip;
 412
 413         for (sip = pci->skips_tail; sip != NULL; sip = sip->prev) {
 414                 if (end == (sip->start - 1)) {
 415                         sip->start = start;
 416                         return;
 417                 } else if (start == (sip->end + 1)) {
 418                         sip->end = end;
 419                         return;
 420                 }
 421         }
 422
 423         sip = malloc(sizeof(struct skip_info));
 424         sip->start = start;
 425         sip->end = end;
 426         sip->prev = sip->next = NULL;
 427         if (pci->skips_tail == NULL)
 428                 pci->skips_head = pci->skips_tail = sip;
 429         else {
 430                 sip->prev = pci->skips_tail;
 431                 pci->skips_tail->next = sip;
 432                 pci->skips_tail = sip;
 433         }
 434 }
 435
 436 static void remove_sip(struct per_cpu_info *pci, struct skip_info *sip)
 437 {
 438         if (sip->prev == NULL) {
 439                 if (sip->next == NULL)
 440                         pci->skips_head = pci->skips_tail = NULL;
 441                 else {
 442                         pci->skips_head = sip->next;
 443                         sip->next->prev = NULL;
 444                 }
 445         } else if (sip->next == NULL) {
 446                 pci->skips_tail = sip->prev;
 447                 sip->prev->next = NULL;
 448         } else {
 449                 sip->prev->next = sip->next;
 450                 sip->next->prev = sip->prev;
 451         }
 452
 453         sip->prev = sip->next = NULL;
 454         free(sip);
 455 }
 456
 457 #define IN_SKIP(sip,seq) (((sip)->start <= (seq)) && ((seq) <= sip->end))
 458 static int check_current_skips(struct per_cpu_info *pci, unsigned long seq)
 459 {
 460         struct skip_info *sip;
 461
 462         for (sip = pci->skips_tail; sip != NULL; sip = sip->prev) {
 463                 if (IN_SKIP(sip, seq)) {
 464                         if (sip->start == seq) {
 465                                 if (sip->end == seq)
 466                                         remove_sip(pci, sip);
 467                                 else
 468                                         sip->start += 1;
 469                         } else if (sip->end == seq)
 470                                 sip->end -= 1;
 471                         else {
 472                                 sip->end = seq - 1;
 473                                 insert_skip(pci, seq + 1, sip->end);
 474                         }
 475                         return 1;
 476                 }
 477         }
 478
 479         return 0;
 480 }
 481
 482 static void collect_pdi_skips(struct per_dev_info *pdi)
 483 {
 484         struct skip_info *sip;
 485         int cpu;
 486
 487         pdi->skips = 0;
 488         pdi->seq_skips = 0;
 489
 490         for (cpu = 0; cpu < pdi->ncpus; cpu++) {
 491                 struct per_cpu_info *pci = &pdi->cpus[cpu];
 492
 493                 for (sip = pci->skips_head; sip != NULL; sip = sip->next) {
 494                         pdi->skips++;
 495                         pdi->seq_skips += (sip->end - sip->start + 1);
 496                         if (verbose)
 497                                 fprintf(stderr,"(%d,%d): skipping %lu -> %lu\n",
 498                                         MAJOR(pdi->dev), MINOR(pdi->dev),
 499                                         sip->start, sip->end);
 500                 }
 501         }
 502 }
 503
 504 static void cpu_mark_online(struct per_dev_info *pdi, unsigned int cpu)
 505 {
 506         if (cpu >= pdi->cpu_map_max || !pdi->cpu_map) {
 507                 int new_max = (cpu + CPUS_PER_LONG) & ~(CPUS_PER_LONG - 1);
 508                 unsigned long *map = malloc(new_max / sizeof(long));
 509
 510                 memset(map, 0, new_max / sizeof(long));
 511
 512                 if (pdi->cpu_map) {
 513                         memcpy(map, pdi->cpu_map, pdi->cpu_map_max / sizeof(long));
 514                         free(pdi->cpu_map);
 515                 }
 516
 517                 pdi->cpu_map = map;
 518                 pdi->cpu_map_max = new_max;
 519         }
 520
 521         pdi->cpu_map[CPU_IDX(cpu)] |= (1UL << CPU_BIT(cpu));
 522 }
 523
 524 static inline void cpu_mark_offline(struct per_dev_info *pdi, int cpu)
 525 {
 526         pdi->cpu_map[CPU_IDX(cpu)] &= ~(1UL << CPU_BIT(cpu));
 527 }
 528
 529 static inline int cpu_is_online(struct per_dev_info *pdi, int cpu)
 530 {
 531         return (pdi->cpu_map[CPU_IDX(cpu)] & (1UL << CPU_BIT(cpu))) != 0;
 532 }
 533
 534 static inline int ppm_hash_pid(pid_t pid)
 535 {
 536         return jhash_1word(pid, JHASH_RANDOM) & PPM_HASH_MASK;
 537 }
 538
 539 static struct process_pid_map *find_ppm(pid_t pid)
 540 {
 541         const int hash_idx = ppm_hash_pid(pid);
 542         struct process_pid_map *ppm;
 543
 544         ppm = ppm_hash_table[hash_idx];
 545         while (ppm) {
 546                 if (ppm->pid == pid)
 547                         return ppm;
 548
 549                 ppm = ppm->hash_next;
 550         }
 551
 552         return NULL;
 553 }
 554
 555 static struct process_pid_map *add_ppm_hash(pid_t pid, const char *name)
 556 {
 557         const int hash_idx = ppm_hash_pid(pid);
 558         struct process_pid_map *ppm;
 559
 560         ppm = find_ppm(pid);
 561         if (!ppm) {
 562                 ppm = malloc(sizeof(*ppm));
 563                 memset(ppm, 0, sizeof(*ppm));
 564                 ppm->pid = pid;
 565                 memset(ppm->comm, 0, sizeof(ppm->comm));
 566                 strncpy(ppm->comm, name, sizeof(ppm->comm));
 567                 ppm->comm[sizeof(ppm->comm) - 1] = '\0';
 568                 ppm->hash_next = ppm_hash_table[hash_idx];
 569                 ppm_hash_table[hash_idx] = ppm;
 570         }
 571
 572         return ppm;
 573 }
 574
 575 static void handle_notify(struct blk_io_trace *bit)
 576 {
 577         void    *payload = (caddr_t) bit + sizeof(*bit);
 578         __u32   two32[2];
 579
 580         switch (bit->action) {
 581         case BLK_TN_PROCESS:
 582                 add_ppm_hash(bit->pid, payload);
 583                 break;
 584
 585         case BLK_TN_TIMESTAMP:
 586                 if (bit->pdu_len != sizeof(two32))
 587                         return;
 588                 memcpy(two32, payload, sizeof(two32));
 589                 if (!data_is_native) {
 590                         two32[0] = be32_to_cpu(two32[0]);
 591                         two32[1] = be32_to_cpu(two32[1]);
 592                 }
 593                 start_timestamp = bit->time;
 594                 abs_start_time.tv_sec  = two32[0];
 595                 abs_start_time.tv_nsec = two32[1];
 596                 if (abs_start_time.tv_nsec < 0) {
 597                         abs_start_time.tv_sec--;
 598                         abs_start_time.tv_nsec += 1000000000;
 599                 }
 600
 601                 break;
 602
 603         case BLK_TN_MESSAGE:
 604                 if (bit->pdu_len > 0) {
 605                         char msg[bit->pdu_len+1];
 606
 607                         memcpy(msg, (char *)payload, bit->pdu_len);
 608                         msg[bit->pdu_len] = '\0';
 609
 610                         fprintf(ofp,
 611                                 "%3d,%-3d %2d %8s %5d.%09lu %5u %2s %3s %s\n",
 612                                 MAJOR(bit->device), MINOR(bit->device),
 613                                 bit->cpu, "0", (int) SECONDS(bit->time),
 614                                 (unsigned long) NANO_SECONDS(bit->time),
 615                                 0, "m", "N", msg);
 616                 }
 617                 break;
 618
 619         default:
 620                 /* Ignore unknown notify events */
 621                 ;
 622         }
 623 }
 624
 625 char *find_process_name(pid_t pid)
 626 {
 627         struct process_pid_map *ppm = find_ppm(pid);
 628
 629         if (ppm)
 630                 return ppm->comm;
 631
 632         return NULL;
 633 }
 634
 635 static inline int ppi_hash_pid(pid_t pid)
 636 {
 637         return jhash_1word(pid, JHASH_RANDOM) & PPI_HASH_MASK;
 638 }
 639
 640 static inline int ppi_hash_name(const char *name)
 641 {
 642         return jhash(name, 16, JHASH_RANDOM) & PPI_HASH_MASK;
 643 }
 644
 645 static inline int ppi_hash(struct per_process_info *ppi)
 646 {
 647         struct process_pid_map *ppm = ppi->ppm;
 648
 649         if (ppi_hash_by_pid)
 650                 return ppi_hash_pid(ppm->pid);
 651
 652         return ppi_hash_name(ppm->comm);
 653 }
 654
 655 static inline void add_ppi_to_hash(struct per_process_info *ppi)
 656 {
 657         const int hash_idx = ppi_hash(ppi);
 658
 659         ppi->hash_next = ppi_hash_table[hash_idx];
 660         ppi_hash_table[hash_idx] = ppi;
 661 }
 662
 663 static inline void add_ppi_to_list(struct per_process_info *ppi)
 664 {
 665         ppi->list_next = ppi_list;
 666         ppi_list = ppi;
 667         ppi_list_entries++;
 668 }
 669
 670 static struct per_process_info *find_ppi_by_name(char *name)
 671 {
 672         const int hash_idx = ppi_hash_name(name);
 673         struct per_process_info *ppi;
 674
 675         ppi = ppi_hash_table[hash_idx];
 676         while (ppi) {
 677                 struct process_pid_map *ppm = ppi->ppm;
 678
 679                 if (!strcmp(ppm->comm, name))
 680                         return ppi;
 681
 682                 ppi = ppi->hash_next;
 683         }
 684
 685         return NULL;
 686 }
 687
 688 static struct per_process_info *find_ppi_by_pid(pid_t pid)
 689 {
 690         const int hash_idx = ppi_hash_pid(pid);
 691         struct per_process_info *ppi;
 692
 693         ppi = ppi_hash_table[hash_idx];
 694         while (ppi) {
 695                 struct process_pid_map *ppm = ppi->ppm;
 696
 697                 if (ppm->pid == pid)
 698                         return ppi;
 699
 700                 ppi = ppi->hash_next;
 701         }
 702
 703         return NULL;
 704 }
 705
 706 static struct per_process_info *find_ppi(pid_t pid)
 707 {
 708         struct per_process_info *ppi;
 709         char *name;
 710
 711         if (ppi_hash_by_pid)
 712                 return find_ppi_by_pid(pid);
 713
 714         name = find_process_name(pid);
 715         if (!name)
 716                 return NULL;
 717
 718         ppi = find_ppi_by_name(name);
 719         if (ppi && ppi->ppm->pid != pid)
 720                 ppi->more_than_one = 1;
 721
 722         return ppi;
 723 }
 724
 725 /*
 726  * struct trace and blktrace allocation cache, we do potentially
 727  * millions of mallocs for these structures while only using at most
 728  * a few thousand at the time
 729  */
 730 static inline void t_free(struct trace *t)
 731 {
 732         if (t_alloc_cache < 1024) {
 733                 t->next = t_alloc_list;
 734                 t_alloc_list = t;
 735                 t_alloc_cache++;
 736         } else
 737                 free(t);
 738 }
 739
 740 static inline struct trace *t_alloc(void)
 741 {
 742         struct trace *t = t_alloc_list;
 743
 744         if (t) {
 745                 t_alloc_list = t->next;
 746                 t_alloc_cache--;
 747                 return t;
 748         }
 749
 750         return malloc(sizeof(*t));
 751 }
 752
 753 static inline void bit_free(struct blk_io_trace *bit)
 754 {
 755         if (bit_alloc_cache < 1024 && !bit->pdu_len) {
 756                 /*
 757                  * abuse a 64-bit field for a next pointer for the free item
 758                  */
 759                 bit->time = (__u64) (unsigned long) bit_alloc_list;
 760                 bit_alloc_list = (struct blk_io_trace *) bit;
 761                 bit_alloc_cache++;
 762         } else
 763                 free(bit);
 764 }
 765
 766 static inline struct blk_io_trace *bit_alloc(void)
 767 {
 768         struct blk_io_trace *bit = bit_alloc_list;
 769
 770         if (bit) {
 771                 bit_alloc_list = (struct blk_io_trace *) (unsigned long) \
 772                                  bit->time;
 773                 bit_alloc_cache--;
 774                 return bit;
 775         }
 776
 777         return malloc(sizeof(*bit));
 778 }
 779
 780 static inline void __put_trace_last(struct per_dev_info *pdi, struct trace *t)
 781 {
 782         struct per_cpu_info *pci = get_cpu_info(pdi, t->bit->cpu);
 783
 784         rb_erase(&t->rb_node, &pci->rb_last);
 785         pci->rb_last_entries--;
 786
 787         bit_free(t->bit);
 788         t_free(t);
 789 }
 790
 791 static void put_trace(struct per_dev_info *pdi, struct trace *t)
 792 {
 793         rb_erase(&t->rb_node, &rb_sort_root);
 794         rb_sort_entries--;
 795
 796         trace_rb_insert_last(pdi, t);
 797 }
 798
 799 static inline int trace_rb_insert(struct trace *t, struct rb_root *root)
 800 {
 801         struct rb_node **p = &root->rb_node;
 802         struct rb_node *parent = NULL;
 803         struct trace *__t;
 804
 805         while (*p) {
 806                 parent = *p;
 807
 808                 __t = rb_entry(parent, struct trace, rb_node);
 809
 810                 if (t->bit->time < __t->bit->time)
 811                         p = &(*p)->rb_left;
 812                 else if (t->bit->time > __t->bit->time)
 813                         p = &(*p)->rb_right;
 814                 else if (t->bit->device < __t->bit->device)
 815                         p = &(*p)->rb_left;
 816                 else if (t->bit->device > __t->bit->device)
 817                         p = &(*p)->rb_right;
 818                 else if (t->bit->sequence < __t->bit->sequence)
 819                         p = &(*p)->rb_left;
 820                 else    /* >= sequence */
 821                         p = &(*p)->rb_right;
 822         }
 823
 824         rb_link_node(&t->rb_node, parent, p);
 825         rb_insert_color(&t->rb_node, root);
 826         return 0;
 827 }
 828
 829 static inline int trace_rb_insert_sort(struct trace *t)
 830 {
 831         if (!trace_rb_insert(t, &rb_sort_root)) {
 832                 rb_sort_entries++;
 833                 return 0;
 834         }
 835
 836         return 1;
 837 }
 838
 839 static int trace_rb_insert_last(struct per_dev_info *pdi, struct trace *t)
 840 {
 841         struct per_cpu_info *pci = get_cpu_info(pdi, t->bit->cpu);
 842
 843         if (trace_rb_insert(t, &pci->rb_last))
 844                 return 1;
 845
 846         pci->rb_last_entries++;
 847
 848         if (pci->rb_last_entries > rb_batch * pdi->nfiles) {
 849                 struct rb_node *n = rb_first(&pci->rb_last);
 850
 851                 t = rb_entry(n, struct trace, rb_node);
 852                 __put_trace_last(pdi, t);
 853         }
 854
 855         return 0;
 856 }
 857
 858 static struct trace *trace_rb_find(dev_t device, unsigned long sequence,
 859                                    struct rb_root *root, int order)
 860 {
 861         struct rb_node *n = root->rb_node;
 862         struct rb_node *prev = NULL;
 863         struct trace *__t;
 864
 865         while (n) {
 866                 __t = rb_entry(n, struct trace, rb_node);
 867                 prev = n;
 868
 869                 if (device < __t->bit->device)
 870                         n = n->rb_left;
 871                 else if (device > __t->bit->device)
 872                         n = n->rb_right;
 873                 else if (sequence < __t->bit->sequence)
 874                         n = n->rb_left;
 875                 else if (sequence > __t->bit->sequence)
 876                         n = n->rb_right;
 877                 else
 878                         return __t;
 879         }
 880
 881         /*
 882          * hack - the list may not be sequence ordered because some
 883          * events don't have sequence and time matched. so we end up
 884          * being a little off in the rb lookup here, because we don't
 885          * know the time we are looking for. compensate by browsing
 886          * a little ahead from the last entry to find the match
 887          */
 888         if (order && prev) {
 889                 int max = 5;
 890
 891                 while (((n = rb_next(prev)) != NULL) && max--) {
 892                         __t = rb_entry(n, struct trace, rb_node);
 893
 894                         if (__t->bit->device == device &&
 895                             __t->bit->sequence == sequence)
 896                                 return __t;
 897
 898                         prev = n;
 899                 }
 900         }
 901
 902         return NULL;
 903 }
 904
 905 static inline struct trace *trace_rb_find_last(struct per_dev_info *pdi,
 906                                                struct per_cpu_info *pci,
 907                                                unsigned long seq)
 908 {
 909         return trace_rb_find(pdi->dev, seq, &pci->rb_last, 0);
 910 }
 911
 912 static inline int track_rb_insert(struct per_dev_info *pdi,struct io_track *iot)
 913 {
 914         struct rb_node **p = &pdi->rb_track.rb_node;
 915         struct rb_node *parent = NULL;
 916         struct io_track *__iot;
 917
 918         while (*p) {
 919                 parent = *p;
 920                 __iot = rb_entry(parent, struct io_track, rb_node);
 921
 922                 if (iot->sector < __iot->sector)
 923                         p = &(*p)->rb_left;
 924                 else if (iot->sector > __iot->sector)
 925                         p = &(*p)->rb_right;
 926                 else {
 927                         fprintf(stderr,
 928                                 "sector alias (%Lu) on device %d,%d!\n",
 929                                 (unsigned long long) iot->sector,
 930                                 MAJOR(pdi->dev), MINOR(pdi->dev));
 931                         return 1;
 932                 }
 933         }
 934
 935         rb_link_node(&iot->rb_node, parent, p);
 936         rb_insert_color(&iot->rb_node, &pdi->rb_track);
 937         return 0;
 938 }
 939
 940 static struct io_track *__find_track(struct per_dev_info *pdi, __u64 sector)
 941 {
 942         struct rb_node *n = pdi->rb_track.rb_node;
 943         struct io_track *__iot;
 944
 945         while (n) {
 946                 __iot = rb_entry(n, struct io_track, rb_node);
 947
 948                 if (sector < __iot->sector)
 949                         n = n->rb_left;
 950                 else if (sector > __iot->sector)
 951                         n = n->rb_right;
 952                 else
 953                         return __iot;
 954         }
 955
 956         return NULL;
 957 }
 958
 959 static struct io_track *find_track(struct per_dev_info *pdi, pid_t pid,
 960                                    __u64 sector)
 961 {
 962         struct io_track *iot;
 963
 964         iot = __find_track(pdi, sector);
 965         if (!iot) {
 966                 iot = malloc(sizeof(*iot));
 967                 iot->ppm = find_ppm(pid);
 968                 if (!iot->ppm)
 969                         iot->ppm = add_ppm_hash(pid, "unknown");
 970                 iot->sector = sector;
 971                 track_rb_insert(pdi, iot);
 972         }
 973
 974         return iot;
 975 }
 976
 977 static void log_track_frontmerge(struct per_dev_info *pdi,
 978                                  struct blk_io_trace *t)
 979 {
 980         struct io_track *iot;
 981
 982         if (!track_ios)
 983                 return;
 984
 985         iot = __find_track(pdi, t->sector + t_sec(t));
 986         if (!iot) {
 987                 if (verbose)
 988                         fprintf(stderr, "merge not found for (%d,%d): %llu\n",
 989                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 990                                 (unsigned long long) t->sector + t_sec(t));
 991                 return;
 992         }
 993
 994         rb_erase(&iot->rb_node, &pdi->rb_track);
 995         iot->sector -= t_sec(t);
 996         track_rb_insert(pdi, iot);
 997 }
 998
 999 static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace *t)
1000 {
1001         struct io_track *iot;
1002
1003         if (!track_ios)
1004                 return;
1005
1006         iot = find_track(pdi, t->pid, t->sector);
1007         iot->allocation_time = t->time;
1008 }
1009
1010 static inline int is_remapper(struct per_dev_info *pdi)
1011 {
1012         int major = MAJOR(pdi->dev);
1013
1014         return (major == 253 || major == 9);
1015 }
1016
1017 /*
1018  * for md/dm setups, the interesting cycle is Q -> C. So track queueing
1019  * time here, as dispatch time
1020  */
1021 static void log_track_queue(struct per_dev_info *pdi, struct blk_io_trace *t)
1022 {
1023         struct io_track *iot;
1024
1025         if (!track_ios)
1026                 return;
1027         if (!is_remapper(pdi))
1028                 return;
1029
1030         iot = find_track(pdi, t->pid, t->sector);
1031         iot->dispatch_time = t->time;
1032 }
1033
1034 /*
1035  * return time between rq allocation and insertion
1036  */
1037 static unsigned long long log_track_insert(struct per_dev_info *pdi,
1038                                            struct blk_io_trace *t)
1039 {
1040         unsigned long long elapsed;
1041         struct io_track *iot;
1042
1043         if (!track_ios)
1044                 return -1;
1045
1046         iot = find_track(pdi, t->pid, t->sector);
1047         iot->queue_time = t->time;
1048
1049         if (!iot->allocation_time)
1050                 return -1;
1051
1052         elapsed = iot->queue_time - iot->allocation_time;
1053
1054         if (per_process_stats) {
1055                 struct per_process_info *ppi = find_ppi(iot->ppm->pid);
1056                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
1057
1058                 if (ppi && elapsed > ppi->longest_allocation_wait[w])
1059                         ppi->longest_allocation_wait[w] = elapsed;
1060         }
1061
1062         return elapsed;
1063 }
1064
1065 /*
1066  * return time between queue and issue
1067  */
1068 static unsigned long long log_track_issue(struct per_dev_info *pdi,
1069                                           struct blk_io_trace *t)
1070 {
1071         unsigned long long elapsed;
1072         struct io_track *iot;
1073
1074         if (!track_ios)
1075                 return -1;
1076         if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
1077                 return -1;
1078
1079         iot = __find_track(pdi, t->sector);
1080         if (!iot) {
1081                 if (verbose)
1082                         fprintf(stderr, "issue not found for (%d,%d): %llu\n",
1083                                 MAJOR(pdi->dev), MINOR(pdi->dev),
1084                                 (unsigned long long) t->sector);
1085                 return -1;
1086         }
1087
1088         iot->dispatch_time = t->time;
1089         elapsed = iot->dispatch_time - iot->queue_time;
1090
1091         if (per_process_stats) {
1092                 struct per_process_info *ppi = find_ppi(iot->ppm->pid);
1093                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
1094
1095                 if (ppi && elapsed > ppi->longest_dispatch_wait[w])
1096                         ppi->longest_dispatch_wait[w] = elapsed;
1097         }
1098
1099         return elapsed;
1100 }
1101
1102 /*
1103  * return time between dispatch and complete
1104  */
1105 static unsigned long long log_track_complete(struct per_dev_info *pdi,
1106                                              struct blk_io_trace *t)
1107 {
1108         unsigned long long elapsed;
1109         struct io_track *iot;
1110
1111         if (!track_ios)
1112                 return -1;
1113
1114         iot = __find_track(pdi, t->sector);
1115         if (!iot) {
1116                 if (verbose)
1117                         fprintf(stderr,"complete not found for (%d,%d): %llu\n",
1118                                 MAJOR(pdi->dev), MINOR(pdi->dev),
1119                                 (unsigned long long) t->sector);
1120                 return -1;
1121         }
1122
1123         iot->completion_time = t->time;
1124         elapsed = iot->completion_time - iot->dispatch_time;
1125
1126         if (per_process_stats) {
1127                 struct per_process_info *ppi = find_ppi(iot->ppm->pid);
1128                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
1129
1130                 if (ppi && elapsed > ppi->longest_completion_wait[w])
1131                         ppi->longest_completion_wait[w] = elapsed;
1132         }
1133
1134         /*
1135          * kill the trace, we don't need it after completion
1136          */
1137         rb_erase(&iot->rb_node, &pdi->rb_track);
1138         free(iot);
1139
1140         return elapsed;
1141 }
1142
1143
1144 static struct io_stats *find_process_io_stats(pid_t pid)
1145 {
1146         struct per_process_info *ppi = find_ppi(pid);
1147
1148         if (!ppi) {
1149                 ppi = malloc(sizeof(*ppi));
1150                 memset(ppi, 0, sizeof(*ppi));
1151                 ppi->ppm = find_ppm(pid);
1152                 if (!ppi->ppm)
1153                         ppi->ppm = add_ppm_hash(pid, "unknown");
1154                 add_ppi_to_hash(ppi);
1155                 add_ppi_to_list(ppi);
1156         }
1157
1158         return &ppi->io_stats;
1159 }
1160
1161 static char *get_dev_name(struct per_dev_info *pdi, char *buffer, int size)
1162 {
1163         if (pdi->name)
1164                 snprintf(buffer, size, "%s", pdi->name);
1165         else
1166                 snprintf(buffer, size, "%d,%d",MAJOR(pdi->dev),MINOR(pdi->dev));
1167         return buffer;
1168 }
1169
1170 static void check_time(struct per_dev_info *pdi, struct blk_io_trace *bit)
1171 {
1172         unsigned long long this = bit->time;
1173         unsigned long long last = pdi->last_reported_time;
1174
1175         pdi->backwards = (this < last) ? 'B' : ' ';
1176         pdi->last_reported_time = this;
1177 }
1178
1179 static inline void __account_m(struct io_stats *ios, struct blk_io_trace *t,
1180                                int rw)
1181 {
1182         if (rw) {
1183                 ios->mwrites++;
1184                 ios->mwrite_kb += t_kb(t);
1185                 ios->mwrite_b += t_b(t);
1186         } else {
1187                 ios->mreads++;
1188                 ios->mread_kb += t_kb(t);
1189                 ios->mread_b += t_b(t);
1190         }
1191 }
1192
1193 static inline void account_m(struct blk_io_trace *t, struct per_cpu_info *pci,
1194                              int rw)
1195 {
1196         __account_m(&pci->io_stats, t, rw);
1197
1198         if (per_process_stats) {
1199                 struct io_stats *ios = find_process_io_stats(t->pid);
1200
1201                 __account_m(ios, t, rw);
1202         }
1203 }
1204
1205 static inline void __account_pc_queue(struct io_stats *ios,
1206                                       struct blk_io_trace *t, int rw)
1207 {
1208         if (rw) {
1209                 ios->qwrites_pc++;
1210                 ios->qwrite_kb_pc += t_kb(t);
1211                 ios->qwrite_b_pc += t_b(t);
1212         } else {
1213                 ios->qreads_pc++;
1214                 ios->qread_kb += t_kb(t);
1215                 ios->qread_b_pc += t_b(t);
1216         }
1217 }
1218
1219 static inline void account_pc_queue(struct blk_io_trace *t,
1220                                     struct per_cpu_info *pci, int rw)
1221 {
1222         __account_pc_queue(&pci->io_stats, t, rw);
1223
1224         if (per_process_stats) {
1225                 struct io_stats *ios = find_process_io_stats(t->pid);
1226
1227                 __account_pc_queue(ios, t, rw);
1228         }
1229 }
1230
1231 static inline void __account_pc_issue(struct io_stats *ios, int rw,
1232                                       unsigned int bytes)
1233 {
1234         if (rw) {
1235                 ios->iwrites_pc++;
1236                 ios->iwrite_kb_pc += bytes >> 10;
1237                 ios->iwrite_b_pc += bytes & 1023;
1238         } else {
1239                 ios->ireads_pc++;
1240                 ios->iread_kb_pc += bytes >> 10;
1241                 ios->iread_b_pc += bytes & 1023;
1242         }
1243 }
1244
1245 static inline void account_pc_issue(struct blk_io_trace *t,
1246                                     struct per_cpu_info *pci, int rw)
1247 {
1248         __account_pc_issue(&pci->io_stats, rw, t->bytes);
1249
1250         if (per_process_stats) {
1251                 struct io_stats *ios = find_process_io_stats(t->pid);
1252
1253                 __account_pc_issue(ios, rw, t->bytes);
1254         }
1255 }
1256
1257 static inline void __account_pc_requeue(struct io_stats *ios,
1258                                         struct blk_io_trace *t, int rw)
1259 {
1260         if (rw) {
1261                 ios->wrqueue_pc++;
1262                 ios->iwrite_kb_pc -= t_kb(t);
1263                 ios->iwrite_b_pc -= t_b(t);
1264         } else {
1265                 ios->rrqueue_pc++;
1266                 ios->iread_kb_pc -= t_kb(t);
1267                 ios->iread_b_pc -= t_b(t);
1268         }
1269 }
1270
1271 static inline void account_pc_requeue(struct blk_io_trace *t,
1272                                       struct per_cpu_info *pci, int rw)
1273 {
1274         __account_pc_requeue(&pci->io_stats, t, rw);
1275
1276         if (per_process_stats) {
1277                 struct io_stats *ios = find_process_io_stats(t->pid);
1278
1279                 __account_pc_requeue(ios, t, rw);
1280         }
1281 }
1282
1283 static inline void __account_pc_c(struct io_stats *ios, int rw)
1284 {
1285         if (rw)
1286                 ios->cwrites_pc++;
1287         else
1288                 ios->creads_pc++;
1289 }
1290
1291 static inline void account_pc_c(struct blk_io_trace *t,
1292                                 struct per_cpu_info *pci, int rw)
1293 {
1294         __account_pc_c(&pci->io_stats, rw);
1295
1296         if (per_process_stats) {
1297                 struct io_stats *ios = find_process_io_stats(t->pid);
1298
1299                 __account_pc_c(ios, rw);
1300         }
1301 }
1302
1303 static inline void __account_queue(struct io_stats *ios, struct blk_io_trace *t,
1304                                    int rw)
1305 {
1306         if (rw) {
1307                 ios->qwrites++;
1308                 ios->qwrite_kb += t_kb(t);
1309                 ios->qwrite_b += t_b(t);
1310         } else {
1311                 ios->qreads++;
1312                 ios->qread_kb += t_kb(t);
1313                 ios->qread_b += t_b(t);
1314         }
1315 }
1316
1317 static inline void account_queue(struct blk_io_trace *t,
1318                                  struct per_cpu_info *pci, int rw)
1319 {
1320         __account_queue(&pci->io_stats, t, rw);
1321
1322         if (per_process_stats) {
1323                 struct io_stats *ios = find_process_io_stats(t->pid);
1324
1325                 __account_queue(ios, t, rw);
1326         }
1327 }
1328
1329 static inline void __account_c(struct io_stats *ios, int rw, int bytes)
1330 {
1331         if (rw) {
1332                 ios->cwrites++;
1333                 ios->cwrite_kb += bytes >> 10;
1334                 ios->cwrite_b += bytes & 1023;
1335         } else {
1336                 ios->creads++;
1337                 ios->cread_kb += bytes >> 10;
1338                 ios->cread_b += bytes & 1023;
1339         }
1340 }
1341
1342 static inline void account_c(struct blk_io_trace *t, struct per_cpu_info *pci,
1343                              int rw, int bytes)
1344 {
1345         __account_c(&pci->io_stats, rw, bytes);
1346
1347         if (per_process_stats) {
1348                 struct io_stats *ios = find_process_io_stats(t->pid);
1349
1350                 __account_c(ios, rw, bytes);
1351         }
1352 }
1353
1354 static inline void __account_issue(struct io_stats *ios, int rw,
1355                                    unsigned int bytes)
1356 {
1357         if (rw) {
1358                 ios->iwrites++;
1359                 ios->iwrite_kb += bytes >> 10;
1360                 ios->iwrite_b  += bytes & 1023;
1361         } else {
1362                 ios->ireads++;
1363                 ios->iread_kb += bytes >> 10;
1364                 ios->iread_b  += bytes & 1023;
1365         }
1366 }
1367
1368 static inline void account_issue(struct blk_io_trace *t,
1369                                  struct per_cpu_info *pci, int rw)
1370 {
1371         __account_issue(&pci->io_stats, rw, t->bytes);
1372
1373         if (per_process_stats) {
1374                 struct io_stats *ios = find_process_io_stats(t->pid);
1375
1376                 __account_issue(ios, rw, t->bytes);
1377         }
1378 }
1379
1380 static inline void __account_unplug(struct io_stats *ios, int timer)
1381 {
1382         if (timer)
1383                 ios->timer_unplugs++;
1384         else
1385                 ios->io_unplugs++;
1386 }
1387
1388 static inline void account_unplug(struct blk_io_trace *t,
1389                                   struct per_cpu_info *pci, int timer)
1390 {
1391         __account_unplug(&pci->io_stats, timer);
1392
1393         if (per_process_stats) {
1394                 struct io_stats *ios = find_process_io_stats(t->pid);
1395
1396                 __account_unplug(ios, timer);
1397         }
1398 }
1399
1400 static inline void __account_requeue(struct io_stats *ios,
1401                                      struct blk_io_trace *t, int rw)
1402 {
1403         if (rw) {
1404                 ios->wrqueue++;
1405                 ios->iwrite_kb -= t_kb(t);
1406                 ios->iwrite_b -= t_b(t);
1407         } else {
1408                 ios->rrqueue++;
1409                 ios->iread_kb -= t_kb(t);
1410                 ios->iread_b -= t_b(t);
1411         }
1412 }
1413
1414 static inline void account_requeue(struct blk_io_trace *t,
1415                                    struct per_cpu_info *pci, int rw)
1416 {
1417         __account_requeue(&pci->io_stats, t, rw);
1418
1419         if (per_process_stats) {
1420                 struct io_stats *ios = find_process_io_stats(t->pid);
1421
1422                 __account_requeue(ios, t, rw);
1423         }
1424 }
1425
1426 static void log_complete(struct per_dev_info *pdi, struct per_cpu_info *pci,
1427                          struct blk_io_trace *t, char *act)
1428 {
1429         process_fmt(act, pci, t, log_track_complete(pdi, t), 0, NULL);
1430 }
1431
1432 static void log_insert(struct per_dev_info *pdi, struct per_cpu_info *pci,
1433                        struct blk_io_trace *t, char *act)
1434 {
1435         process_fmt(act, pci, t, log_track_insert(pdi, t), 0, NULL);
1436 }
1437
1438 static void log_queue(struct per_cpu_info *pci, struct blk_io_trace *t,
1439                       char *act)
1440 {
1441         process_fmt(act, pci, t, -1, 0, NULL);
1442 }
1443
1444 static void log_issue(struct per_dev_info *pdi, struct per_cpu_info *pci,
1445                       struct blk_io_trace *t, char *act)
1446 {
1447         process_fmt(act, pci, t, log_track_issue(pdi, t), 0, NULL);
1448 }
1449
1450 static void log_merge(struct per_dev_info *pdi, struct per_cpu_info *pci,
1451                       struct blk_io_trace *t, char *act)
1452 {
1453         if (act[0] == 'F')
1454                 log_track_frontmerge(pdi, t);
1455
1456         process_fmt(act, pci, t, -1ULL, 0, NULL);
1457 }
1458
1459 static void log_action(struct per_cpu_info *pci, struct blk_io_trace *t,
1460                         char *act)
1461 {
1462         process_fmt(act, pci, t, -1ULL, 0, NULL);
1463 }
1464
1465 static void log_generic(struct per_cpu_info *pci, struct blk_io_trace *t,
1466                         char *act)
1467 {
1468         process_fmt(act, pci, t, -1ULL, 0, NULL);
1469 }
1470
1471 static void log_unplug(struct per_cpu_info *pci, struct blk_io_trace *t,
1472                       char *act)
1473 {
1474         process_fmt(act, pci, t, -1ULL, 0, NULL);
1475 }
1476
1477 static void log_split(struct per_cpu_info *pci, struct blk_io_trace *t,
1478                       char *act)
1479 {
1480         process_fmt(act, pci, t, -1ULL, 0, NULL);
1481 }
1482
1483 static void log_pc(struct per_cpu_info *pci, struct blk_io_trace *t, char *act)
1484 {
1485         unsigned char *buf = (unsigned char *) t + sizeof(*t);
1486
1487         process_fmt(act, pci, t, -1ULL, t->pdu_len, buf);
1488 }
1489
1490 static void dump_trace_pc(struct blk_io_trace *t, struct per_dev_info *pdi,
1491                           struct per_cpu_info *pci)
1492 {
1493         int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
1494         int act = t->action & 0xffff;
1495
1496         switch (act) {
1497                 case __BLK_TA_QUEUE:
1498                         log_generic(pci, t, "Q");
1499                         account_pc_queue(t, pci, w);
1500                         break;
1501                 case __BLK_TA_GETRQ:
1502                         log_generic(pci, t, "G");
1503                         break;
1504                 case __BLK_TA_SLEEPRQ:
1505                         log_generic(pci, t, "S");
1506                         break;
1507                 case __BLK_TA_REQUEUE:
1508                         /*
1509                          * can happen if we miss traces, don't let it go
1510                          * below zero
1511                          */
1512                         if (pdi->cur_depth[w])
1513                                 pdi->cur_depth[w]--;
1514                         account_pc_requeue(t, pci, w);
1515                         log_generic(pci, t, "R");
1516                         break;
1517                 case __BLK_TA_ISSUE:
1518                         account_pc_issue(t, pci, w);
1519                         pdi->cur_depth[w]++;
1520                         if (pdi->cur_depth[w] > pdi->max_depth[w])
1521                                 pdi->max_depth[w] = pdi->cur_depth[w];
1522                         log_pc(pci, t, "D");
1523                         break;
1524                 case __BLK_TA_COMPLETE:
1525                         if (pdi->cur_depth[w])
1526                                 pdi->cur_depth[w]--;
1527                         log_pc(pci, t, "C");
1528                         account_pc_c(t, pci, w);
1529                         break;
1530                 case __BLK_TA_INSERT:
1531                         log_pc(pci, t, "I");
1532                         break;
1533                 default:
1534                         fprintf(stderr, "Bad pc action %x\n", act);
1535                         break;
1536         }
1537 }
1538
1539 static void dump_trace_fs(struct blk_io_trace *t, struct per_dev_info *pdi,
1540                           struct per_cpu_info *pci)
1541 {
1542         int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
1543         int act = t->action & 0xffff;
1544
1545         switch (act) {
1546                 case __BLK_TA_QUEUE:
1547                         log_track_queue(pdi, t);
1548                         account_queue(t, pci, w);
1549                         log_queue(pci, t, "Q");
1550                         break;
1551                 case __BLK_TA_INSERT:
1552                         log_insert(pdi, pci, t, "I");
1553                         break;
1554                 case __BLK_TA_BACKMERGE:
1555                         account_m(t, pci, w);
1556                         log_merge(pdi, pci, t, "M");
1557                         break;
1558                 case __BLK_TA_FRONTMERGE:
1559                         account_m(t, pci, w);
1560                         log_merge(pdi, pci, t, "F");
1561                         break;
1562                 case __BLK_TA_GETRQ:
1563                         log_track_getrq(pdi, t);
1564                         log_generic(pci, t, "G");
1565                         break;
1566                 case __BLK_TA_SLEEPRQ:
1567                         log_generic(pci, t, "S");
1568                         break;
1569                 case __BLK_TA_REQUEUE:
1570                         /*
1571                          * can happen if we miss traces, don't let it go
1572                          * below zero
1573                          */
1574                         if (pdi->cur_depth[w])
1575                                 pdi->cur_depth[w]--;
1576                         account_requeue(t, pci, w);
1577                         log_queue(pci, t, "R");
1578                         break;
1579                 case __BLK_TA_ISSUE:
1580                         account_issue(t, pci, w);
1581                         pdi->cur_depth[w]++;
1582                         if (pdi->cur_depth[w] > pdi->max_depth[w])
1583                                 pdi->max_depth[w] = pdi->cur_depth[w];
1584                         log_issue(pdi, pci, t, "D");
1585                         break;
1586                 case __BLK_TA_COMPLETE:
1587                         if (pdi->cur_depth[w])
1588                                 pdi->cur_depth[w]--;
1589                         account_c(t, pci, w, t->bytes);
1590                         log_complete(pdi, pci, t, "C");
1591                         break;
1592                 case __BLK_TA_PLUG:
1593                         log_action(pci, t, "P");
1594                         break;
1595                 case __BLK_TA_UNPLUG_IO:
1596                         account_unplug(t, pci, 0);
1597                         log_unplug(pci, t, "U");
1598                         break;
1599                 case __BLK_TA_UNPLUG_TIMER:
1600                         account_unplug(t, pci, 1);
1601                         log_unplug(pci, t, "UT");
1602                         break;
1603                 case __BLK_TA_SPLIT:
1604                         log_split(pci, t, "X");
1605                         break;
1606                 case __BLK_TA_BOUNCE:
1607                         log_generic(pci, t, "B");
1608                         break;
1609                 case __BLK_TA_REMAP:
1610                         log_generic(pci, t, "A");
1611                         break;
1612                 case __BLK_TA_DRV_DATA:
1613                         have_drv_data = 1;
1614                         /* dump to binary file only */
1615                         break;
1616                 default:
1617                         fprintf(stderr, "Bad fs action %x\n", t->action);
1618                         break;
1619         }
1620 }
1621
1622 static void dump_trace(struct blk_io_trace *t, struct per_cpu_info *pci,
1623                        struct per_dev_info *pdi)
1624 {
1625         if (text_output) {
1626                 if (t->action == BLK_TN_MESSAGE)
1627                         handle_notify(t);
1628                 else if (t->action & BLK_TC_ACT(BLK_TC_PC))
1629                         dump_trace_pc(t, pdi, pci);
1630                 else
1631                         dump_trace_fs(t, pdi, pci);
1632         }
1633
1634         if (!pdi->events)
1635                 pdi->first_reported_time = t->time;
1636
1637         pdi->events++;
1638
1639         if (bin_output_msgs ||
1640                             !(t->action & BLK_TC_ACT(BLK_TC_NOTIFY) &&
1641                               t->action == BLK_TN_MESSAGE))
1642                 output_binary(t, sizeof(*t) + t->pdu_len);
1643 }
1644
1645 /*
1646  * print in a proper way, not too small and not too big. if more than
1647  * 1000,000K, turn into M and so on
1648  */
1649 static char *size_cnv(char *dst, unsigned long long num, int in_kb)
1650 {
1651         char suff[] = { '\0', 'K', 'M', 'G', 'P' };
1652         unsigned int i = 0;
1653
1654         if (in_kb)
1655                 i++;
1656
1657         while (num > 1000 * 1000ULL && (i < sizeof(suff) - 1)) {
1658                 i++;
1659                 num /= 1000;
1660         }
1661
1662         sprintf(dst, "%'8Lu%c", num, suff[i]);
1663         return dst;
1664 }
1665
1666 static void dump_io_stats(struct per_dev_info *pdi, struct io_stats *ios,
1667                           char *msg)
1668 {
1669         static char x[256], y[256];
1670
1671         fprintf(ofp, "%s\n", msg);
1672
1673         fprintf(ofp, " Reads Queued:    %s, %siB\t",
1674                         size_cnv(x, ios->qreads, 0),
1675                         size_cnv(y, ios->qread_kb + (ios->qread_b>>10), 1));
1676         fprintf(ofp, " Writes Queued:    %s, %siB\n",
1677                         size_cnv(x, ios->qwrites, 0),
1678                         size_cnv(y, ios->qwrite_kb + (ios->qwrite_b>>10), 1));
1679         fprintf(ofp, " Read Dispatches: %s, %siB\t",
1680                         size_cnv(x, ios->ireads, 0),
1681                         size_cnv(y, ios->iread_kb + (ios->iread_b>>10), 1));
1682         fprintf(ofp, " Write Dispatches: %s, %siB\n",
1683                         size_cnv(x, ios->iwrites, 0),
1684                         size_cnv(y, ios->iwrite_kb + (ios->iwrite_b>>10), 1));
1685         fprintf(ofp, " Reads Requeued:  %s\t\t", size_cnv(x, ios->rrqueue, 0));
1686         fprintf(ofp, " Writes Requeued:  %s\n", size_cnv(x, ios->wrqueue, 0));
1687         fprintf(ofp, " Reads Completed: %s, %siB\t",
1688                         size_cnv(x, ios->creads, 0),
1689                         size_cnv(y, ios->cread_kb + (ios->cread_b>>10), 1));
1690         fprintf(ofp, " Writes Completed: %s, %siB\n",
1691                         size_cnv(x, ios->cwrites, 0),
1692                         size_cnv(y, ios->cwrite_kb + (ios->cwrite_b>>10), 1));
1693         fprintf(ofp, " Read Merges:     %s, %siB\t",
1694                         size_cnv(x, ios->mreads, 0),
1695                         size_cnv(y, ios->mread_kb + (ios->mread_b>>10), 1));
1696         fprintf(ofp, " Write Merges:     %s, %siB\n",
1697                         size_cnv(x, ios->mwrites, 0),
1698                         size_cnv(y, ios->mwrite_kb + (ios->mwrite_b>>10), 1));
1699         if (pdi) {
1700                 fprintf(ofp, " Read depth:      %'8u%8c\t", pdi->max_depth[0], ' ');
1701                 fprintf(ofp, " Write depth:      %'8u\n", pdi->max_depth[1]);
1702         }
1703         if (ios->qreads_pc || ios->qwrites_pc || ios->ireads_pc || ios->iwrites_pc ||
1704             ios->rrqueue_pc || ios->wrqueue_pc || ios->creads_pc || ios->cwrites_pc) {
1705                 fprintf(ofp, " PC Reads Queued: %s, %siB\t",
1706                         size_cnv(x, ios->qreads_pc, 0),
1707                         size_cnv(y,
1708                                 ios->qread_kb_pc + (ios->qread_b_pc>>10), 1));
1709                 fprintf(ofp, " PC Writes Queued: %s, %siB\n",
1710                         size_cnv(x, ios->qwrites_pc, 0),
1711                         size_cnv(y,
1712                                 ios->qwrite_kb_pc + (ios->qwrite_b_pc>>10), 1));
1713                 fprintf(ofp, " PC Read Disp.:   %s, %siB\t",
1714                         size_cnv(x, ios->ireads_pc, 0),
1715                         size_cnv(y,
1716                                 ios->iread_kb_pc + (ios->iread_b_pc>>10), 1));
1717                 fprintf(ofp, " PC Write Disp.:   %s, %siB\n",
1718                         size_cnv(x, ios->iwrites_pc, 0),
1719                         size_cnv(y,
1720                                 ios->iwrite_kb_pc + (ios->iwrite_b_pc>>10),
1721                                 1));
1722                 fprintf(ofp, " PC Reads Req.:   %s\t\t", size_cnv(x, ios->rrqueue_pc, 0));
1723                 fprintf(ofp, " PC Writes Req.:   %s\n", size_cnv(x, ios->wrqueue_pc, 0));
1724                 fprintf(ofp, " PC Reads Compl.: %s\t\t", size_cnv(x, ios->creads_pc, 0));
1725                 fprintf(ofp, " PC Writes Compl.: %s\n", size_cnv(x, ios->cwrites_pc, 0));
1726         }
1727         fprintf(ofp, " IO unplugs:      %'8lu%8c\t", ios->io_unplugs, ' ');
1728         fprintf(ofp, " Timer unplugs:    %'8lu\n", ios->timer_unplugs);
1729 }
1730
1731 static void dump_wait_stats(struct per_process_info *ppi)
1732 {
1733         unsigned long rawait = ppi->longest_allocation_wait[0] / 1000;
1734         unsigned long rdwait = ppi->longest_dispatch_wait[0] / 1000;
1735         unsigned long rcwait = ppi->longest_completion_wait[0] / 1000;
1736         unsigned long wawait = ppi->longest_allocation_wait[1] / 1000;
1737         unsigned long wdwait = ppi->longest_dispatch_wait[1] / 1000;
1738         unsigned long wcwait = ppi->longest_completion_wait[1] / 1000;
1739
1740         fprintf(ofp, " Allocation wait: %'8lu%8c\t", rawait, ' ');
1741         fprintf(ofp, " Allocation wait:  %'8lu\n", wawait);
1742         fprintf(ofp, " Dispatch wait:   %'8lu%8c\t", rdwait, ' ');
1743         fprintf(ofp, " Dispatch wait:    %'8lu\n", wdwait);
1744         fprintf(ofp, " Completion wait: %'8lu%8c\t", rcwait, ' ');
1745         fprintf(ofp, " Completion wait:  %'8lu\n", wcwait);
1746 }
1747
1748 static int ppi_name_compare(const void *p1, const void *p2)
1749 {
1750         struct per_process_info *ppi1 = *((struct per_process_info **) p1);
1751         struct per_process_info *ppi2 = *((struct per_process_info **) p2);
1752         int res;
1753
1754         res = strverscmp(ppi1->ppm->comm, ppi2->ppm->comm);
1755         if (!res)
1756                 res = ppi1->ppm->pid > ppi2->ppm->pid;
1757
1758         return res;
1759 }
1760
1761 static void sort_process_list(void)
1762 {
1763         struct per_process_info **ppis;
1764         struct per_process_info *ppi;
1765         int i = 0;
1766
1767         ppis = malloc(ppi_list_entries * sizeof(struct per_process_info *));
1768
1769         ppi = ppi_list;
1770         while (ppi) {
1771                 ppis[i++] = ppi;
1772                 ppi = ppi->list_next;
1773         }
1774
1775         qsort(ppis, ppi_list_entries, sizeof(ppi), ppi_name_compare);
1776
1777         i = ppi_list_entries - 1;
1778         ppi_list = NULL;
1779         while (i >= 0) {
1780                 ppi = ppis[i];
1781
1782                 ppi->list_next = ppi_list;
1783                 ppi_list = ppi;
1784                 i--;
1785         }
1786
1787         free(ppis);
1788 }
1789
1790 static void show_process_stats(void)
1791 {
1792         struct per_process_info *ppi;
1793
1794         sort_process_list();
1795
1796         ppi = ppi_list;
1797         while (ppi) {
1798                 struct process_pid_map *ppm = ppi->ppm;
1799                 char name[64];
1800
1801                 if (ppi->more_than_one)
1802                         sprintf(name, "%s (%u, ...)", ppm->comm, ppm->pid);
1803                 else
1804                         sprintf(name, "%s (%u)", ppm->comm, ppm->pid);
1805
1806                 dump_io_stats(NULL, &ppi->io_stats, name);
1807                 dump_wait_stats(ppi);
1808                 ppi = ppi->list_next;
1809         }
1810
1811         fprintf(ofp, "\n");
1812 }
1813
1814 static void show_device_and_cpu_stats(void)
1815 {
1816         struct per_dev_info *pdi;
1817         struct per_cpu_info *pci;
1818         struct io_stats total, *ios;
1819         unsigned long long rrate, wrate, msec;
1820         int i, j, pci_events;
1821         char line[3 + 8/*cpu*/ + 2 + 32/*dev*/ + 3];
1822         char name[32];
1823         double ratio;
1824
1825         for (pdi = devices, i = 0; i < ndevices; i++, pdi++) {
1826
1827                 memset(&total, 0, sizeof(total));
1828                 pci_events = 0;
1829
1830                 if (i > 0)
1831                         fprintf(ofp, "\n");
1832
1833                 for (pci = pdi->cpus, j = 0; j < pdi->ncpus; j++, pci++) {
1834                         if (!pci->nelems)
1835                                 continue;
1836
1837                         ios = &pci->io_stats;
1838                         total.qreads += ios->qreads;
1839                         total.qwrites += ios->qwrites;
1840                         total.creads += ios->creads;
1841                         total.cwrites += ios->cwrites;
1842                         total.mreads += ios->mreads;
1843                         total.mwrites += ios->mwrites;
1844                         total.ireads += ios->ireads;
1845                         total.iwrites += ios->iwrites;
1846                         total.rrqueue += ios->rrqueue;
1847                         total.wrqueue += ios->wrqueue;
1848                         total.qread_kb += ios->qread_kb;
1849                         total.qwrite_kb += ios->qwrite_kb;
1850                         total.cread_kb += ios->cread_kb;
1851                         total.cwrite_kb += ios->cwrite_kb;
1852                         total.iread_kb += ios->iread_kb;
1853                         total.iwrite_kb += ios->iwrite_kb;
1854                         total.mread_kb += ios->mread_kb;
1855                         total.mwrite_kb += ios->mwrite_kb;
1856                         total.qread_b += ios->qread_b;
1857                         total.qwrite_b += ios->qwrite_b;
1858                         total.cread_b += ios->cread_b;
1859                         total.cwrite_b += ios->cwrite_b;
1860                         total.iread_b += ios->iread_b;
1861                         total.iwrite_b += ios->iwrite_b;
1862                         total.mread_b += ios->mread_b;
1863                         total.mwrite_b += ios->mwrite_b;
1864
1865                         total.qreads_pc += ios->qreads_pc;
1866                         total.qwrites_pc += ios->qwrites_pc;
1867                         total.creads_pc += ios->creads_pc;
1868                         total.cwrites_pc += ios->cwrites_pc;
1869                         total.ireads_pc += ios->ireads_pc;
1870                         total.iwrites_pc += ios->iwrites_pc;
1871                         total.rrqueue_pc += ios->rrqueue_pc;
1872                         total.wrqueue_pc += ios->wrqueue_pc;
1873                         total.qread_kb_pc += ios->qread_kb_pc;
1874                         total.qwrite_kb_pc += ios->qwrite_kb_pc;
1875                         total.iread_kb_pc += ios->iread_kb_pc;
1876                         total.iwrite_kb_pc += ios->iwrite_kb_pc;
1877                         total.qread_b_pc += ios->qread_b_pc;
1878                         total.qwrite_b_pc += ios->qwrite_b_pc;
1879                         total.iread_b_pc += ios->iread_b_pc;
1880                         total.iwrite_b_pc += ios->iwrite_b_pc;
1881
1882                         total.timer_unplugs += ios->timer_unplugs;
1883                         total.io_unplugs += ios->io_unplugs;
1884
1885                         snprintf(line, sizeof(line) - 1, "CPU%d (%s):",
1886                                  j, get_dev_name(pdi, name, sizeof(name)));
1887                         dump_io_stats(pdi, ios, line);
1888                         pci_events++;
1889                 }
1890
1891                 if (pci_events > 1) {
1892                         fprintf(ofp, "\n");
1893                         snprintf(line, sizeof(line) - 1, "Total (%s):",
1894                                  get_dev_name(pdi, name, sizeof(name)));
1895                         dump_io_stats(NULL, &total, line);
1896                 }
1897
1898                 wrate = rrate = 0;
1899                 msec = (pdi->last_reported_time - pdi->first_reported_time) / 1000000;
1900                 if (msec) {
1901                         rrate = ((1000 * total.cread_kb) + total.cread_b) /
1902                                                                         msec;
1903                         wrate = ((1000 * total.cwrite_kb) + total.cwrite_b) /
1904                                                                         msec;
1905                 }
1906
1907                 fprintf(ofp, "\nThroughput (R/W): %'LuKiB/s / %'LuKiB/s\n",
1908                         rrate, wrate);
1909                 fprintf(ofp, "Events (%s): %'Lu entries\n",
1910                         get_dev_name(pdi, line, sizeof(line)), pdi->events);
1911
1912                 collect_pdi_skips(pdi);
1913                 if (!pdi->skips && !pdi->events)
1914                         ratio = 0.0;
1915                 else
1916                         ratio = 100.0 * ((double)pdi->seq_skips /
1917                                         (double)(pdi->events + pdi->seq_skips));
1918                 fprintf(ofp, "Skips: %'lu forward (%'llu - %5.1lf%%)\n",
1919                         pdi->skips, pdi->seq_skips, ratio);
1920         }
1921 }
1922
1923 static void find_genesis(void)
1924 {
1925         struct trace *t = trace_list;
1926
1927         genesis_time = -1ULL;
1928         while (t != NULL) {
1929                 if (t->bit->time < genesis_time)
1930                         genesis_time = t->bit->time;
1931
1932                 t = t->next;
1933         }
1934
1935         /* The time stamp record will usually be the first
1936          * record in the trace, but not always.
1937          */
1938         if (start_timestamp
1939          && start_timestamp != genesis_time) {
1940                 long delta = genesis_time - start_timestamp;
1941
1942                 abs_start_time.tv_sec  += SECONDS(delta);
1943                 abs_start_time.tv_nsec += NANO_SECONDS(delta);
1944                 if (abs_start_time.tv_nsec < 0) {
1945                         abs_start_time.tv_nsec += 1000000000;
1946                         abs_start_time.tv_sec -= 1;
1947                 } else
1948                 if (abs_start_time.tv_nsec > 1000000000) {
1949                         abs_start_time.tv_nsec -= 1000000000;
1950                         abs_start_time.tv_sec += 1;
1951                 }
1952         }
1953 }
1954
1955 static inline int check_stopwatch(struct blk_io_trace *bit)
1956 {
1957         if (bit->time < stopwatch_end &&
1958             bit->time >= stopwatch_start)
1959                 return 0;
1960
1961         return 1;
1962 }
1963
1964 /*
1965  * return youngest entry read
1966  */
1967 static int sort_entries(unsigned long long *youngest)
1968 {
1969         struct per_dev_info *pdi = NULL;
1970         struct per_cpu_info *pci = NULL;
1971         struct trace *t;
1972
1973         if (!genesis_time)
1974                 find_genesis();
1975
1976         *youngest = 0;
1977         while ((t = trace_list) != NULL) {
1978                 struct blk_io_trace *bit = t->bit;
1979
1980                 trace_list = t->next;
1981
1982                 bit->time -= genesis_time;
1983
1984                 if (bit->time < *youngest || !*youngest)
1985                         *youngest = bit->time;
1986
1987                 if (!pdi || pdi->dev != bit->device) {
1988                         pdi = get_dev_info(bit->device);
1989                         pci = NULL;
1990                 }
1991
1992                 if (!pci || pci->cpu != bit->cpu)
1993                         pci = get_cpu_info(pdi, bit->cpu);
1994
1995                 if (bit->sequence < pci->smallest_seq_read)
1996                         pci->smallest_seq_read = bit->sequence;
1997
1998                 if (check_stopwatch(bit)) {
1999                         bit_free(bit);
2000                         t_free(t);
2001                         continue;
2002                 }
2003
2004                 if (trace_rb_insert_sort(t))
2005                         return -1;
2006         }
2007
2008         return 0;
2009 }
2010
2011 /*
2012  * to continue, we must have traces from all online cpus in the tree
2013  */
2014 static int check_cpu_map(struct per_dev_info *pdi)
2015 {
2016         unsigned long *cpu_map;
2017         struct rb_node *n;
2018         struct trace *__t;
2019         unsigned int i;
2020         int ret, cpu;
2021
2022         /*
2023          * create a map of the cpus we have traces for
2024          */
2025         cpu_map = malloc(pdi->cpu_map_max / sizeof(long));
2026         memset(cpu_map, 0, sizeof(*cpu_map));
2027         n = rb_first(&rb_sort_root);
2028         while (n) {
2029                 __t = rb_entry(n, struct trace, rb_node);
2030                 cpu = __t->bit->cpu;
2031
2032                 cpu_map[CPU_IDX(cpu)] |= (1UL << CPU_BIT(cpu));
2033                 n = rb_next(n);
2034         }
2035
2036         /*
2037          * we can't continue if pdi->cpu_map has entries set that we don't
2038          * have in the sort rbtree. the opposite is not a problem, though
2039          */
2040         ret = 0;
2041         for (i = 0; i < pdi->cpu_map_max / CPUS_PER_LONG; i++) {
2042                 if (pdi->cpu_map[i] & ~(cpu_map[i])) {
2043                         ret = 1;
2044                         break;
2045                 }
2046         }
2047
2048         free(cpu_map);
2049         return ret;
2050 }
2051
2052 static int check_sequence(struct per_dev_info *pdi, struct trace *t, int force)
2053 {
2054         struct blk_io_trace *bit = t->bit;
2055         unsigned long expected_sequence;
2056         struct per_cpu_info *pci;
2057         struct trace *__t;
2058
2059         pci = get_cpu_info(pdi, bit->cpu);
2060         expected_sequence = pci->last_sequence + 1;
2061
2062         if (!expected_sequence) {
2063                 /*
2064                  * 1 should be the first entry, just allow it
2065                  */
2066                 if (bit->sequence == 1)
2067                         return 0;
2068                 if (bit->sequence == pci->smallest_seq_read)
2069                         return 0;
2070
2071                 return check_cpu_map(pdi);
2072         }
2073
2074         if (bit->sequence == expected_sequence)
2075                 return 0;
2076
2077         /*
2078          * we may not have seen that sequence yet. if we are not doing
2079          * the final run, break and wait for more entries.
2080          */
2081         if (expected_sequence < pci->smallest_seq_read) {
2082                 __t = trace_rb_find_last(pdi, pci, expected_sequence);
2083                 if (!__t)
2084                         goto skip;
2085
2086                 __put_trace_last(pdi, __t);
2087                 return 0;
2088         } else if (!force) {
2089                 return 1;
2090         } else {
2091 skip:
2092                 if (check_current_skips(pci, bit->sequence))
2093                         return 0;
2094
2095                 if (expected_sequence < bit->sequence)
2096                         insert_skip(pci, expected_sequence, bit->sequence - 1);
2097                 return 0;
2098         }
2099 }
2100
2101 static void show_entries_rb(int force)
2102 {
2103         struct per_dev_info *pdi = NULL;
2104         struct per_cpu_info *pci = NULL;
2105         struct blk_io_trace *bit;
2106         struct rb_node *n;
2107         struct trace *t;
2108
2109         while ((n = rb_first(&rb_sort_root)) != NULL) {
2110                 if (is_done() && !force && !pipeline)
2111                         break;
2112
2113                 t = rb_entry(n, struct trace, rb_node);
2114                 bit = t->bit;
2115
2116                 if (read_sequence - t->read_sequence < 1 && !force)
2117                         break;
2118
2119                 if (!pdi || pdi->dev != bit->device) {
2120                         pdi = get_dev_info(bit->device);
2121                         pci = NULL;
2122                 }
2123
2124                 if (!pdi) {
2125                         fprintf(stderr, "Unknown device ID? (%d,%d)\n",
2126                                 MAJOR(bit->device), MINOR(bit->device));
2127                         break;
2128                 }
2129
2130                 if (!(bit->action == BLK_TN_MESSAGE) &&
2131                     check_sequence(pdi, t, force))
2132                         break;
2133
2134                 if (!force && bit->time > last_allowed_time)
2135                         break;
2136
2137                 check_time(pdi, bit);
2138
2139                 if (!pci || pci->cpu != bit->cpu)
2140                         pci = get_cpu_info(pdi, bit->cpu);
2141
2142                 if (!(bit->action == BLK_TN_MESSAGE))
2143                         pci->last_sequence = bit->sequence;
2144
2145                 pci->nelems++;
2146
2147                 if (bit->action & (act_mask << BLK_TC_SHIFT))
2148                         dump_trace(bit, pci, pdi);
2149
2150                 put_trace(pdi, t);
2151         }
2152 }
2153
2154 static int read_data(int fd, void *buffer, int bytes, int block, int *fdblock)
2155 {
2156         int ret, bytes_left, fl;
2157         void *p;
2158
2159         if (block != *fdblock) {
2160                 fl = fcntl(fd, F_GETFL);
2161
2162                 if (!block) {
2163                         *fdblock = 0;
2164                         fcntl(fd, F_SETFL, fl | O_NONBLOCK);
2165                 } else {
2166                         *fdblock = 1;
2167                         fcntl(fd, F_SETFL, fl & ~O_NONBLOCK);
2168                 }
2169         }
2170
2171         bytes_left = bytes;
2172         p = buffer;
2173         while (bytes_left > 0) {
2174                 ret = read(fd, p, bytes_left);
2175                 if (!ret)
2176                         return 1;
2177                 else if (ret < 0) {
2178                         if (errno != EAGAIN) {
2179                                 perror("read");
2180                                 return -1;
2181                         }
2182
2183                         /*
2184                          * never do partial reads. we can return if we
2185                          * didn't read anything and we should not block,
2186                          * otherwise wait for data
2187                          */
2188                         if ((bytes_left == bytes) && !block)
2189                                 return 1;
2190
2191                         usleep(10);
2192                         continue;
2193                 } else {
2194                         p += ret;
2195                         bytes_left -= ret;
2196                 }
2197         }
2198
2199         return 0;
2200 }
2201
2202 static inline __u16 get_pdulen(struct blk_io_trace *bit)
2203 {
2204         if (data_is_native)
2205                 return bit->pdu_len;
2206
2207         return __bswap_16(bit->pdu_len);
2208 }
2209
2210 static inline __u32 get_magic(struct blk_io_trace *bit)
2211 {
2212         if (data_is_native)
2213                 return bit->magic;
2214
2215         return __bswap_32(bit->magic);
2216 }
2217
2218 static int read_events(int fd, int always_block, int *fdblock)
2219 {
2220         struct per_dev_info *pdi = NULL;
2221         unsigned int events = 0;
2222
2223         while (!is_done() && events < rb_batch) {
2224                 struct blk_io_trace *bit;
2225                 struct trace *t;
2226                 int pdu_len, should_block, ret;
2227                 __u32 magic;
2228
2229                 bit = bit_alloc();
2230
2231                 should_block = !events || always_block;
2232
2233                 ret = read_data(fd, bit, sizeof(*bit), should_block, fdblock);
2234                 if (ret) {
2235                         bit_free(bit);
2236                         if (!events && ret < 0)
2237                                 events = ret;
2238                         break;
2239                 }
2240
2241                 /*
2242                  * look at first trace to check whether we need to convert
2243                  * data in the future
2244                  */
2245                 if (data_is_native == -1 && check_data_endianness(bit->magic))
2246                         break;
2247
2248                 magic = get_magic(bit);
2249                 if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
2250                         fprintf(stderr, "Bad magic %x\n", magic);
2251                         break;
2252                 }
2253
2254                 pdu_len = get_pdulen(bit);
2255                 if (pdu_len) {
2256                         void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
2257
2258                         if (read_data(fd, ptr + sizeof(*bit), pdu_len, 1, fdblock)) {
2259                                 bit_free(ptr);
2260                                 break;
2261                         }
2262
2263                         bit = ptr;
2264                 }
2265
2266                 trace_to_cpu(bit);
2267
2268                 if (verify_trace(bit)) {
2269                         bit_free(bit);
2270                         continue;
2271                 }
2272
2273                 /*
2274                  * not a real trace, so grab and handle it here
2275                  */
2276                 if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) && bit->action != BLK_TN_MESSAGE) {
2277                         handle_notify(bit);
2278                         output_binary(bit, sizeof(*bit) + bit->pdu_len);
2279                         continue;
2280                 }
2281
2282                 t = t_alloc();
2283                 memset(t, 0, sizeof(*t));
2284                 t->bit = bit;
2285                 t->read_sequence = read_sequence;
2286
2287                 t->next = trace_list;
2288                 trace_list = t;
2289
2290                 if (!pdi || pdi->dev != bit->device)
2291                         pdi = get_dev_info(bit->device);
2292
2293                 if (bit->time > pdi->last_read_time)
2294                         pdi->last_read_time = bit->time;
2295
2296                 events++;
2297         }
2298
2299         return events;
2300 }
2301
2302 /*
2303  * Managing input streams
2304  */
2305
2306 struct ms_stream {
2307         struct ms_stream *next;
2308         struct trace *first, *last;
2309         struct per_dev_info *pdi;
2310         unsigned int cpu;
2311 };
2312
2313 #define MS_HASH(d, c) ((MAJOR(d) & 0xff) ^ (MINOR(d) & 0xff) ^ (cpu & 0xff))
2314
2315 struct ms_stream *ms_head;
2316 struct ms_stream *ms_hash[256];
2317
2318 static void ms_sort(struct ms_stream *msp);
2319 static int ms_prime(struct ms_stream *msp);
2320
2321 static inline struct trace *ms_peek(struct ms_stream *msp)
2322 {
2323         return (msp == NULL) ? NULL : msp->first;
2324 }
2325
2326 static inline __u64 ms_peek_time(struct ms_stream *msp)
2327 {
2328         return ms_peek(msp)->bit->time;
2329 }
2330
2331 static inline void ms_resort(struct ms_stream *msp)
2332 {
2333         if (msp->next && ms_peek_time(msp) > ms_peek_time(msp->next)) {
2334                 ms_head = msp->next;
2335                 msp->next = NULL;
2336                 ms_sort(msp);
2337         }
2338 }
2339
2340 static inline void ms_deq(struct ms_stream *msp)
2341 {
2342         msp->first = msp->first->next;
2343         if (!msp->first) {
2344                 msp->last = NULL;
2345                 if (!ms_prime(msp)) {
2346                         ms_head = msp->next;
2347                         msp->next = NULL;
2348                         return;
2349                 }
2350         }
2351
2352         ms_resort(msp);
2353 }
2354
2355 static void ms_sort(struct ms_stream *msp)
2356 {
2357         __u64 msp_t = ms_peek_time(msp);
2358         struct ms_stream *this_msp = ms_head;
2359
2360         if (this_msp == NULL)
2361                 ms_head = msp;
2362         else if (msp_t < ms_peek_time(this_msp)) {
2363                 msp->next = this_msp;
2364                 ms_head = msp;
2365         }
2366         else {
2367                 while (this_msp->next && ms_peek_time(this_msp->next) < msp_t)
2368                         this_msp = this_msp->next;
2369
2370                 msp->next = this_msp->next;
2371                 this_msp->next = msp;
2372         }
2373 }
2374
2375 static int ms_prime(struct ms_stream *msp)
2376 {
2377         __u32 magic;
2378         unsigned int i;
2379         struct trace *t;
2380         struct per_dev_info *pdi = msp->pdi;
2381         struct per_cpu_info *pci = get_cpu_info(pdi, msp->cpu);
2382         struct blk_io_trace *bit = NULL;
2383         int ret, pdu_len, ndone = 0;
2384
2385         for (i = 0; !is_done() && pci->fd >= 0 && i < rb_batch; i++) {
2386                 bit = bit_alloc();
2387                 ret = read_data(pci->fd, bit, sizeof(*bit), 1, &pci->fdblock);
2388                 if (ret)
2389                         goto err;
2390
2391                 if (data_is_native == -1 && check_data_endianness(bit->magic))
2392                         goto err;
2393
2394                 magic = get_magic(bit);
2395                 if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
2396                         fprintf(stderr, "Bad magic %x\n", magic);
2397                         goto err;
2398
2399                 }
2400
2401                 pdu_len = get_pdulen(bit);
2402                 if (pdu_len) {
2403                         void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
2404                         ret = read_data(pci->fd, ptr + sizeof(*bit), pdu_len,
2405                                                              1, &pci->fdblock);
2406                         if (ret) {
2407                                 free(ptr);
2408                                 bit = NULL;
2409                                 goto err;
2410                         }
2411
2412                         bit = ptr;
2413                 }
2414
2415                 trace_to_cpu(bit);
2416                 if (verify_trace(bit))
2417                         goto err;
2418
2419                 if (bit->cpu != pci->cpu) {
2420                         fprintf(stderr, "cpu %d trace info has error cpu %d\n",
2421                                 pci->cpu, bit->cpu);
2422                         continue;
2423                 }
2424
2425                 if (bit->action & BLK_TC_ACT(BLK_TC_NOTIFY) && bit->action != BLK_TN_MESSAGE) {
2426                         handle_notify(bit);
2427                         output_binary(bit, sizeof(*bit) + bit->pdu_len);
2428                         bit_free(bit);
2429
2430                         i -= 1;
2431                         continue;
2432                 }
2433
2434                 if (bit->time > pdi->last_read_time)
2435                         pdi->last_read_time = bit->time;
2436
2437                 t = t_alloc();
2438                 memset(t, 0, sizeof(*t));
2439                 t->bit = bit;
2440
2441                 if (msp->first == NULL)
2442                         msp->first = msp->last = t;
2443                 else {
2444                         msp->last->next = t;
2445                         msp->last = t;
2446                 }
2447
2448                 ndone++;
2449         }
2450
2451         return ndone;
2452
2453 err:
2454         if (bit) bit_free(bit);
2455
2456         cpu_mark_offline(pdi, pci->cpu);
2457         close(pci->fd);
2458         pci->fd = -1;
2459
2460         return ndone;
2461 }
2462
2463 static struct ms_stream *ms_alloc(struct per_dev_info *pdi, int cpu)
2464 {
2465         struct ms_stream *msp = malloc(sizeof(*msp));
2466
2467         msp->next = NULL;
2468         msp->first = msp->last = NULL;
2469         msp->pdi = pdi;
2470         msp->cpu = cpu;
2471
2472         if (ms_prime(msp))
2473                 ms_sort(msp);
2474
2475         return msp;
2476 }
2477
2478 static int setup_file(struct per_dev_info *pdi, int cpu)
2479 {
2480         int len = 0;
2481         struct stat st;
2482         char *p, *dname;
2483         struct per_cpu_info *pci = get_cpu_info(pdi, cpu);
2484
2485         pci->cpu = cpu;
2486         pci->fdblock = -1;
2487
2488         p = strdup(pdi->name);
2489         dname = dirname(p);
2490         if (strcmp(dname, ".")) {
2491                 input_dir = dname;
2492                 p = strdup(pdi->name);
2493                 strcpy(pdi->name, basename(p));
2494         }
2495         free(p);
2496
2497         if (input_dir)
2498                 len = sprintf(pci->fname, "%s/", input_dir);
2499
2500         snprintf(pci->fname + len, sizeof(pci->fname)-1-len,
2501                  "%s.blktrace.%d", pdi->name, pci->cpu);
2502         if (stat(pci->fname, &st) < 0)
2503                 return 0;
2504         if (!st.st_size)
2505                 return 1;
2506
2507         pci->fd = open(pci->fname, O_RDONLY);
2508         if (pci->fd < 0) {
2509                 perror(pci->fname);
2510                 return 0;
2511         }
2512
2513         printf("Input file %s added\n", pci->fname);
2514         cpu_mark_online(pdi, pci->cpu);
2515
2516         pdi->nfiles++;
2517         ms_alloc(pdi, pci->cpu);
2518
2519         return 1;
2520 }
2521
2522 static int handle(struct ms_stream *msp)
2523 {
2524         struct trace *t;
2525         struct per_dev_info *pdi;
2526         struct per_cpu_info *pci;
2527         struct blk_io_trace *bit;
2528
2529         t = ms_peek(msp);
2530
2531         bit = t->bit;
2532         pdi = msp->pdi;
2533         pci = get_cpu_info(pdi, msp->cpu);
2534         pci->nelems++;
2535         bit->time -= genesis_time;
2536
2537         if (t->bit->time > stopwatch_end)
2538                 return 0;
2539
2540         pdi->last_reported_time = bit->time;
2541         if ((bit->action & (act_mask << BLK_TC_SHIFT))&&
2542             t->bit->time >= stopwatch_start)
2543                 dump_trace(bit, pci, pdi);
2544
2545         ms_deq(msp);
2546
2547         if (text_output)
2548                 trace_rb_insert_last(pdi, t);
2549         else {
2550                 bit_free(t->bit);
2551                 t_free(t);
2552         }
2553
2554         return 1;
2555 }
2556
2557 /*
2558  * Check if we need to sanitize the name. We allow 'foo', or if foo.blktrace.X
2559  * is given, then strip back down to 'foo' to avoid missing files.
2560  */
2561 static int name_fixup(char *name)
2562 {
2563         char *b;
2564
2565         if (!name)
2566                 return 1;
2567
2568         b = strstr(name, ".blktrace.");
2569         if (b)
2570                 *b = '\0';
2571
2572         return 0;
2573 }
2574
2575 static int do_file(void)
2576 {
2577         int i, cpu, ret;
2578         struct per_dev_info *pdi;
2579
2580         /*
2581          * first prepare all files for reading
2582          */
2583         for (i = 0; i < ndevices; i++) {
2584                 pdi = &devices[i];
2585                 ret = name_fixup(pdi->name);
2586                 if (ret)
2587                         return ret;
2588
2589                 for (cpu = 0; setup_file(pdi, cpu); cpu++)
2590                         ;
2591
2592                 if (!cpu) {
2593                         fprintf(stderr,"No input files found for %s\n",
2594                                 pdi->name);
2595                         return 1;
2596                 }
2597         }
2598
2599         /*
2600          * Get the initial time stamp
2601          */
2602         if (ms_head)
2603                 genesis_time = ms_peek_time(ms_head);
2604
2605         /*
2606          * Keep processing traces while any are left
2607          */
2608         while (!is_done() && ms_head && handle(ms_head))
2609                 ;
2610
2611         return 0;
2612 }
2613
2614 static void do_pipe(int fd)
2615 {
2616         unsigned long long youngest;
2617         int events, fdblock;
2618
2619         last_allowed_time = -1ULL;
2620         fdblock = -1;
2621         while ((events = read_events(fd, 0, &fdblock)) > 0) {
2622                 read_sequence++;
2623
2624 #if 0
2625                 smallest_seq_read = -1U;
2626 #endif
2627
2628                 if (sort_entries(&youngest))
2629                         break;
2630
2631                 if (youngest > stopwatch_end)
2632                         break;
2633
2634                 show_entries_rb(0);
2635         }
2636
2637         if (rb_sort_entries)
2638                 show_entries_rb(1);
2639 }
2640
2641 static int do_fifo(void)
2642 {
2643         int fd;
2644
2645         if (!strcmp(pipename, "-"))
2646                 fd = dup(STDIN_FILENO);
2647         else
2648                 fd = open(pipename, O_RDONLY);
2649
2650         if (fd == -1) {
2651                 perror("dup stdin");
2652                 return -1;
2653         }
2654
2655         do_pipe(fd);
2656         close(fd);
2657         return 0;
2658 }
2659
2660 static void show_stats(void)
2661 {
2662         if (!ofp)
2663                 return;
2664         if (stats_printed)
2665                 return;
2666
2667         stats_printed = 1;
2668
2669         if (per_process_stats)
2670                 show_process_stats();
2671
2672         if (per_device_and_cpu_stats)
2673                 show_device_and_cpu_stats();
2674
2675         fflush(ofp);
2676 }
2677
2678 static void handle_sigint(__attribute__((__unused__)) int sig)
2679 {
2680         done = 1;
2681 }
2682
2683 /*
2684  * Extract start and duration times from a string, allowing
2685  * us to specify a time interval of interest within a trace.
2686  * Format: "duration" (start is zero) or "start:duration".
2687  */
2688 static int find_stopwatch_interval(char *string)
2689 {
2690         double value;
2691         char *sp;
2692
2693         value = strtod(string, &sp);
2694         if (sp == string) {
2695                 fprintf(stderr,"Invalid stopwatch timer: %s\n", string);
2696                 return 1;
2697         }
2698         if (*sp == ':') {
2699                 stopwatch_start = DOUBLE_TO_NANO_ULL(value);
2700                 string = sp + 1;
2701                 value = strtod(string, &sp);
2702                 if (sp == string || *sp != '\0') {
2703                         fprintf(stderr,"Invalid stopwatch duration time: %s\n",
2704                                 string);
2705                         return 1;
2706                 }
2707         } else if (*sp != '\0') {
2708                 fprintf(stderr,"Invalid stopwatch start timer: %s\n", string);
2709                 return 1;
2710         }
2711         stopwatch_end = DOUBLE_TO_NANO_ULL(value);
2712         if (stopwatch_end <= stopwatch_start) {
2713                 fprintf(stderr, "Invalid stopwatch interval: %Lu -> %Lu\n",
2714                         stopwatch_start, stopwatch_end);
2715                 return 1;
2716         }
2717
2718         return 0;
2719 }
2720
2721 static int is_pipe(const char *str)
2722 {
2723         struct stat st;
2724
2725         if (!strcmp(str, "-"))
2726                 return 1;
2727         if (!stat(str, &st) && S_ISFIFO(st.st_mode))
2728                 return 1;
2729
2730         return 0;
2731 }
2732
2733 #define S_OPTS  "a:A:b:D:d:f:F:hi:o:Oqstw:vVM"
2734 static char usage_str[] =    "\n\n" \
2735         "-i <file>           | --input=<file>\n" \
2736         "[ -a <action field> | --act-mask=<action field> ]\n" \
2737         "[ -A <action mask>  | --set-mask=<action mask> ]\n" \
2738         "[ -b <traces>       | --batch=<traces> ]\n" \
2739         "[ -d <file>         | --dump-binary=<file> ]\n" \
2740         "[ -D <dir>          | --input-directory=<dir> ]\n" \
2741         "[ -f <format>       | --format=<format> ]\n" \
2742         "[ -F <spec>         | --format-spec=<spec> ]\n" \
2743         "[ -h                | --hash-by-name ]\n" \
2744         "[ -o <file>         | --output=<file> ]\n" \
2745         "[ -O                | --no-text-output ]\n" \
2746         "[ -q                | --quiet ]\n" \
2747         "[ -s                | --per-program-stats ]\n" \
2748         "[ -t                | --track-ios ]\n" \
2749         "[ -w <time>         | --stopwatch=<time> ]\n" \
2750         "[ -M                | --no-msgs\n" \
2751         "[ -v                | --verbose ]\n" \
2752         "[ -V                | --version ]\n\n" \
2753         "\t-a Only trace specified actions. See documentation\n" \
2754         "\t-A Give trace mask as a single value. See documentation\n" \
2755         "\t-b stdin read batching\n" \
2756         "\t-d Output file. If specified, binary data is written to file\n" \
2757         "\t-D Directory to prepend to input file names\n" \
2758         "\t-f Output format. Customize the output format. The format field\n" \
2759         "\t   identifies can be found in the documentation\n" \
2760         "\t-F Format specification. Can be found in the documentation\n" \
2761         "\t-h Hash processes by name, not pid\n" \
2762         "\t-i Input file containing trace data, or '-' for stdin\n" \
2763         "\t-o Output file. If not given, output is stdout\n" \
2764         "\t-O Do NOT output text data\n" \
2765         "\t-q Quiet. Don't display any stats at the end of the trace\n" \
2766         "\t-s Show per-program io statistics\n" \
2767         "\t-t Track individual ios. Will tell you the time a request took\n" \
2768         "\t   to get queued, to get dispatched, and to get completed\n" \
2769         "\t-w Only parse data between the given time interval in seconds.\n" \
2770         "\t   If 'start' isn't given, blkparse defaults the start time to 0\n" \
2771         "\t-M Do not output messages to binary file\n" \
2772         "\t-v More verbose for marginal errors\n" \
2773         "\t-V Print program version info\n\n";
2774
2775 static void usage(char *prog)
2776 {
2777         fprintf(stderr, "Usage: %s %s", prog, usage_str);
2778 }
2779
2780 int main(int argc, char *argv[])
2781 {
2782         int i, c, ret, mode;
2783         int act_mask_tmp = 0;
2784         char *ofp_buffer = NULL;
2785         char *bin_ofp_buffer = NULL;
2786
2787         while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) != -1) {
2788                 switch (c) {
2789                 case 'a':
2790                         i = find_mask_map(optarg);
2791                         if (i < 0) {
2792                                 fprintf(stderr,"Invalid action mask %s\n",
2793                                         optarg);
2794                                 return 1;
2795                         }
2796                         act_mask_tmp |= i;
2797                         break;
2798
2799                 case 'A':
2800                         if ((sscanf(optarg, "%x", &i) != 1) ||
2801                                                         !valid_act_opt(i)) {
2802                                 fprintf(stderr,
2803                                         "Invalid set action mask %s/0x%x\n",
2804                                         optarg, i);
2805                                 return 1;
2806                         }
2807                         act_mask_tmp = i;
2808                         break;
2809                 case 'i':
2810                         if (is_pipe(optarg) && !pipeline) {
2811                                 pipeline = 1;
2812                                 pipename = strdup(optarg);
2813                         } else if (resize_devices(optarg) != 0)
2814                                 return 1;
2815                         break;
2816                 case 'D':
2817                         input_dir = optarg;
2818                         break;
2819                 case 'o':
2820                         output_name = optarg;
2821                         break;
2822                 case 'O':
2823                         text_output = 0;
2824                         break;
2825                 case 'b':
2826                         rb_batch = atoi(optarg);
2827                         if (rb_batch <= 0)
2828                                 rb_batch = RB_BATCH_DEFAULT;
2829                         break;
2830                 case 's':
2831                         per_process_stats = 1;
2832                         break;
2833                 case 't':
2834                         track_ios = 1;
2835                         break;
2836                 case 'q':
2837                         per_device_and_cpu_stats = 0;
2838                         break;
2839                 case 'w':
2840                         if (find_stopwatch_interval(optarg) != 0)
2841                                 return 1;
2842                         break;
2843                 case 'f':
2844                         set_all_format_specs(optarg);
2845                         break;
2846                 case 'F':
2847                         if (add_format_spec(optarg) != 0)
2848                                 return 1;
2849                         break;
2850                 case 'h':
2851                         ppi_hash_by_pid = 0;
2852                         break;
2853                 case 'v':
2854                         verbose++;
2855                         break;
2856                 case 'V':
2857                         printf("%s version %s\n", argv[0], blkparse_version);
2858                         return 0;
2859                 case 'd':
2860                         dump_binary = optarg;
2861                         break;
2862                 case 'M':
2863                         bin_output_msgs = 0;
2864                         break;
2865                 default:
2866                         usage(argv[0]);
2867                         return 1;
2868                 }
2869         }
2870
2871         while (optind < argc) {
2872                 if (is_pipe(argv[optind]) && !pipeline) {
2873                         pipeline = 1;
2874                         pipename = strdup(argv[optind]);
2875                 } else if (resize_devices(argv[optind]) != 0)
2876                         return 1;
2877                 optind++;
2878         }
2879
2880         if (!pipeline && !ndevices) {
2881                 usage(argv[0]);
2882                 return 1;
2883         }
2884
2885         if (act_mask_tmp != 0)
2886                 act_mask = act_mask_tmp;
2887
2888         memset(&rb_sort_root, 0, sizeof(rb_sort_root));
2889
2890         signal(SIGINT, handle_sigint);
2891         signal(SIGHUP, handle_sigint);
2892         signal(SIGTERM, handle_sigint);
2893
2894         setlocale(LC_NUMERIC, "en_US");
2895
2896         if (text_output) {
2897                 if (!output_name) {
2898                         ofp = fdopen(STDOUT_FILENO, "w");
2899                         mode = _IOLBF;
2900                 } else {
2901                         char ofname[PATH_MAX];
2902
2903                         snprintf(ofname, sizeof(ofname) - 1, "%s", output_name);
2904                         ofp = fopen(ofname, "w");
2905                         mode = _IOFBF;
2906                 }
2907
2908                 if (!ofp) {
2909                         perror("fopen");
2910                         return 1;
2911                 }
2912
2913                 ofp_buffer = malloc(4096);
2914                 if (setvbuf(ofp, ofp_buffer, mode, 4096)) {
2915                         perror("setvbuf");
2916                         return 1;
2917                 }
2918         }
2919
2920         if (dump_binary) {
2921                 if (!strcmp(dump_binary, "-"))
2922                         dump_fp = stdout;
2923                 else {
2924                         dump_fp = fopen(dump_binary, "w");
2925                         if (!dump_fp) {
2926                                 perror(dump_binary);
2927                                 dump_binary = NULL;
2928                                 return 1;
2929                         }
2930                 }
2931                 bin_ofp_buffer = malloc(128 * 1024);
2932                 if (setvbuf(dump_fp, bin_ofp_buffer, _IOFBF, 128 * 1024)) {
2933                         perror("setvbuf binary");
2934                         return 1;
2935                 }
2936         }
2937
2938         if (pipeline)
2939                 ret = do_fifo();
2940         else
2941                 ret = do_file();
2942
2943         if (!ret)
2944                 show_stats();
2945
2946         if (have_drv_data && !dump_binary)
2947                 printf("\ndiscarded traces containing low-level device driver "
2948                        "specific data (only available in binary output)\n");
2949
2950         if (ofp_buffer) {
2951                 fflush(ofp);
2952                 free(ofp_buffer);
2953         }
2954         if (bin_ofp_buffer) {
2955                 fflush(dump_fp);
2956                 free(bin_ofp_buffer);
2957         }
2958         return ret;
2959 }