blkparse.c

   1 /*
   2  * block queue tracing parse application
   3  *
   4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <getopt.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <locale.h>
  32 #include <libgen.h>
  33
  34 #include "blktrace.h"
  35 #include "rbtree.h"
  36 #include "jhash.h"
  37
  38 static char blkparse_version[] = "0.99";
  39
  40 struct per_dev_info {
  41         dev_t dev;
  42         char *name;
  43
  44         int backwards;
  45         unsigned long long events;
  46         unsigned long long first_reported_time;
  47         unsigned long long last_reported_time;
  48         unsigned long long last_read_time;
  49         struct io_stats io_stats;
  50         unsigned long last_sequence;
  51         unsigned long skips, nskips;
  52         unsigned long long seq_skips, seq_nskips;
  53
  54         struct rb_root rb_last;
  55         unsigned long rb_last_entries;
  56
  57         struct rb_root rb_track;
  58
  59         int nfiles;
  60         int ncpus;
  61
  62         unsigned long *cpu_map;
  63         unsigned int cpu_map_max;
  64
  65         struct per_cpu_info *cpus;
  66 };
  67
  68 struct per_process_info {
  69         char name[16];
  70         __u32 pid;
  71         struct io_stats io_stats;
  72         struct per_process_info *hash_next, *list_next;
  73         int more_than_one;
  74
  75         /*
  76          * individual io stats
  77          */
  78         unsigned long long longest_allocation_wait[2];
  79         unsigned long long longest_dispatch_wait[2];
  80         unsigned long long longest_completion_wait[2];
  81 };
  82
  83 #define PPI_HASH_SHIFT  (8)
  84 #define PPI_HASH_SIZE   (1 << PPI_HASH_SHIFT)
  85 #define PPI_HASH_MASK   (PPI_HASH_SIZE - 1)
  86 static struct per_process_info *ppi_hash_table[PPI_HASH_SIZE];
  87 static struct per_process_info *ppi_list;
  88 static int ppi_list_entries;
  89
  90 #define S_OPTS  "a:A:i:o:b:stqw:f:F:vVhD:"
  91 static struct option l_opts[] = {
  92         {
  93                 .name = "act-mask",
  94                 .has_arg = required_argument,
  95                 .flag = NULL,
  96                 .val = 'a'
  97         },
  98         {
  99                 .name = "set-mask",
 100                 .has_arg = required_argument,
 101                 .flag = NULL,
 102                 .val = 'A'
 103         },
 104         {
 105                 .name = "input",
 106                 .has_arg = required_argument,
 107                 .flag = NULL,
 108                 .val = 'i'
 109         },
 110         {
 111                 .name = "output",
 112                 .has_arg = required_argument,
 113                 .flag = NULL,
 114                 .val = 'o'
 115         },
 116         {
 117                 .name = "batch",
 118                 .has_arg = required_argument,
 119                 .flag = NULL,
 120                 .val = 'b'
 121         },
 122         {
 123                 .name = "per-program-stats",
 124                 .has_arg = no_argument,
 125                 .flag = NULL,
 126                 .val = 's'
 127         },
 128         {
 129                 .name = "track-ios",
 130                 .has_arg = no_argument,
 131                 .flag = NULL,
 132                 .val = 't'
 133         },
 134         {
 135                 .name = "quiet",
 136                 .has_arg = no_argument,
 137                 .flag = NULL,
 138                 .val = 'q'
 139         },
 140         {
 141                 .name = "stopwatch",
 142                 .has_arg = required_argument,
 143                 .flag = NULL,
 144                 .val = 'w'
 145         },
 146         {
 147                 .name = "format",
 148                 .has_arg = required_argument,
 149                 .flag = NULL,
 150                 .val = 'f'
 151         },
 152         {
 153                 .name = "format-spec",
 154                 .has_arg = required_argument,
 155                 .flag = NULL,
 156                 .val = 'F'
 157         },
 158         {
 159                 .name = "hash-by-name",
 160                 .has_arg = no_argument,
 161                 .flag = NULL,
 162                 .val = 'h'
 163         },
 164         {
 165                 .name = "verbose",
 166                 .has_arg = no_argument,
 167                 .flag = NULL,
 168                 .val = 'v'
 169         },
 170         {
 171                 .name = "version",
 172                 .has_arg = no_argument,
 173                 .flag = NULL,
 174                 .val = 'V'
 175         },
 176         {
 177                 .name = "input-directory",
 178                 .has_arg = required_argument,
 179                 .flag = NULL,
 180                 .val = 'D'
 181         },
 182         {
 183                 .name = NULL,
 184         }
 185 };
 186
 187 /*
 188  * for sorting the displayed output
 189  */
 190 struct trace {
 191         struct blk_io_trace *bit;
 192         struct rb_node rb_node;
 193         struct trace *next;
 194 };
 195
 196 static struct rb_root rb_sort_root;
 197 static unsigned long rb_sort_entries;
 198
 199 static struct trace *trace_list;
 200
 201 /*
 202  * allocation cache
 203  */
 204 static struct blk_io_trace *bit_alloc_list;
 205 static struct trace *t_alloc_list;
 206
 207 /*
 208  * for tracking individual ios
 209  */
 210 struct io_track {
 211         struct rb_node rb_node;
 212
 213         __u64 sector;
 214         __u32 pid;
 215         char comm[16];
 216         unsigned long long allocation_time;
 217         unsigned long long queue_time;
 218         unsigned long long dispatch_time;
 219         unsigned long long completion_time;
 220 };
 221
 222 static int ndevices;
 223 static struct per_dev_info *devices;
 224 static char *get_dev_name(struct per_dev_info *, char *, int);
 225
 226 FILE *ofp = NULL;
 227 static char *output_name;
 228 static char *input_dir;
 229
 230 static unsigned long long genesis_time;
 231 static unsigned long long last_allowed_time;
 232 static unsigned int smallest_seq_read;
 233 static unsigned long long stopwatch_start;      /* start from zero by default */
 234 static unsigned long long stopwatch_end = -1ULL;        /* "infinity" */
 235
 236 static int per_process_stats;
 237 static int per_device_and_cpu_stats = 1;
 238 static int track_ios;
 239 static int ppi_hash_by_pid = 1;
 240 static int verbose;
 241 static unsigned int act_mask = -1U;
 242 static int stats_printed;
 243
 244 static unsigned int t_alloc_cache;
 245 static unsigned int bit_alloc_cache;
 246
 247 #define RB_BATCH_DEFAULT        (512)
 248 static unsigned int rb_batch = RB_BATCH_DEFAULT;
 249
 250 static int pipeline;
 251
 252 #define is_done()       (*(volatile int *)(&done))
 253 static volatile int done;
 254
 255 #define JHASH_RANDOM    (0x3af5f2ee)
 256
 257 #define CPUS_PER_LONG   (8 * sizeof(unsigned long))
 258 #define CPU_IDX(cpu)    ((cpu) / CPUS_PER_LONG)
 259 #define CPU_BIT(cpu)    ((cpu) & (CPUS_PER_LONG - 1))
 260
 261 static void cpu_mark_online(struct per_dev_info *pdi, unsigned int cpu)
 262 {
 263         if (cpu >= pdi->cpu_map_max || !pdi->cpu_map) {
 264                 int new_max = (cpu + CPUS_PER_LONG) & ~(CPUS_PER_LONG - 1);
 265                 unsigned long *map = malloc(new_max / sizeof(long));
 266
 267                 memset(map, 0, new_max / sizeof(long));
 268
 269                 if (pdi->cpu_map) {
 270                         memcpy(map, pdi->cpu_map, pdi->cpu_map_max / sizeof(long));
 271                         free(pdi->cpu_map);
 272                 }
 273
 274                 pdi->cpu_map = map;
 275                 pdi->cpu_map_max = new_max;
 276         }
 277
 278         pdi->cpu_map[CPU_IDX(cpu)] |= (1UL << CPU_BIT(cpu));
 279 }
 280
 281 static inline void cpu_mark_offline(struct per_dev_info *pdi, int cpu)
 282 {
 283         pdi->cpu_map[CPU_IDX(cpu)] &= ~(1UL << CPU_BIT(cpu));
 284 }
 285
 286 static inline int cpu_is_online(struct per_dev_info *pdi, int cpu)
 287 {
 288         return (pdi->cpu_map[CPU_IDX(cpu)] & (1UL << CPU_BIT(cpu))) != 0;
 289 }
 290
 291 static inline int ppi_hash_pid(__u32 pid)
 292 {
 293         return jhash_1word(pid, JHASH_RANDOM) & PPI_HASH_MASK;
 294 }
 295
 296 static inline int ppi_hash_name(const char *name)
 297 {
 298         return jhash(name, 16, JHASH_RANDOM) & PPI_HASH_MASK;
 299 }
 300
 301 static inline int ppi_hash(struct per_process_info *ppi)
 302 {
 303         if (ppi_hash_by_pid)
 304                 return ppi_hash_pid(ppi->pid);
 305
 306         return ppi_hash_name(ppi->name);
 307 }
 308
 309 static inline void add_process_to_hash(struct per_process_info *ppi)
 310 {
 311         const int hash_idx = ppi_hash(ppi);
 312
 313         ppi->hash_next = ppi_hash_table[hash_idx];
 314         ppi_hash_table[hash_idx] = ppi;
 315 }
 316
 317 static inline void add_process_to_list(struct per_process_info *ppi)
 318 {
 319         ppi->list_next = ppi_list;
 320         ppi_list = ppi;
 321         ppi_list_entries++;
 322 }
 323
 324 static struct per_process_info *find_process_by_name(char *name)
 325 {
 326         const int hash_idx = ppi_hash_name(name);
 327         struct per_process_info *ppi;
 328
 329         ppi = ppi_hash_table[hash_idx];
 330         while (ppi) {
 331                 if (!strcmp(ppi->name, name))
 332                         return ppi;
 333
 334                 ppi = ppi->hash_next;
 335         }
 336
 337         return NULL;
 338 }
 339
 340 static struct per_process_info *find_process_by_pid(__u32 pid)
 341 {
 342         const int hash_idx = ppi_hash_pid(pid);
 343         struct per_process_info *ppi;
 344
 345         ppi = ppi_hash_table[hash_idx];
 346         while (ppi) {
 347                 if (ppi->pid == pid)
 348                         return ppi;
 349
 350                 ppi = ppi->hash_next;
 351         }
 352
 353         return NULL;
 354 }
 355
 356 static struct per_process_info *find_process(__u32 pid, char *name)
 357 {
 358         struct per_process_info *ppi;
 359
 360         if (ppi_hash_by_pid)
 361                 return find_process_by_pid(pid);
 362
 363         ppi = find_process_by_name(name);
 364         if (ppi && ppi->pid != pid)
 365                 ppi->more_than_one = 1;
 366
 367         return ppi;
 368 }
 369
 370 static inline int trace_rb_insert(struct trace *t, struct rb_root *root,
 371                                   int check_time)
 372 {
 373         struct rb_node **p = &root->rb_node;
 374         struct rb_node *parent = NULL;
 375         struct trace *__t;
 376
 377         while (*p) {
 378                 parent = *p;
 379
 380                 __t = rb_entry(parent, struct trace, rb_node);
 381
 382                 if (check_time) {
 383                         if (t->bit->time < __t->bit->time) {
 384                                 p = &(*p)->rb_left;
 385                                 continue;
 386                         } else if (t->bit->time > __t->bit->time) {
 387                                 p = &(*p)->rb_right;
 388                                 continue;
 389                         }
 390                 }
 391                 if (t->bit->device < __t->bit->device)
 392                         p = &(*p)->rb_left;
 393                 else if (t->bit->device > __t->bit->device)
 394                         p = &(*p)->rb_right;
 395                 else if (t->bit->sequence < __t->bit->sequence)
 396                         p = &(*p)->rb_left;
 397                 else    /* >= sequence */
 398                         p = &(*p)->rb_right;
 399         }
 400
 401         rb_link_node(&t->rb_node, parent, p);
 402         rb_insert_color(&t->rb_node, root);
 403         return 0;
 404 }
 405
 406 static inline int trace_rb_insert_sort(struct trace *t)
 407 {
 408         if (!trace_rb_insert(t, &rb_sort_root, 1)) {
 409                 rb_sort_entries++;
 410                 return 0;
 411         }
 412
 413         return 1;
 414 }
 415
 416 static inline int trace_rb_insert_last(struct per_dev_info *pdi,struct trace *t)
 417 {
 418         if (!trace_rb_insert(t, &pdi->rb_last, 1)) {
 419                 pdi->rb_last_entries++;
 420                 return 0;
 421         }
 422
 423         return 1;
 424 }
 425
 426 static struct trace *trace_rb_find(dev_t device, unsigned long sequence,
 427                                    struct rb_root *root, int order)
 428 {
 429         struct rb_node *n = root->rb_node;
 430         struct rb_node *prev = NULL;
 431         struct trace *__t;
 432
 433         while (n) {
 434                 __t = rb_entry(n, struct trace, rb_node);
 435                 prev = n;
 436
 437                 if (device < __t->bit->device)
 438                         n = n->rb_left;
 439                 else if (device > __t->bit->device)
 440                         n = n->rb_right;
 441                 else if (sequence < __t->bit->sequence)
 442                         n = n->rb_left;
 443                 else if (sequence > __t->bit->sequence)
 444                         n = n->rb_right;
 445                 else
 446                         return __t;
 447         }
 448
 449         /*
 450          * hack - the list may not be sequence ordered because some
 451          * events don't have sequence and time matched. so we end up
 452          * being a little off in the rb lookup here, because we don't
 453          * know the time we are looking for. compensate by browsing
 454          * a little ahead from the last entry to find the match
 455          */
 456         if (order && prev) {
 457                 int max = 5;
 458
 459                 while (((n = rb_next(prev)) != NULL) && max--) {
 460                         __t = rb_entry(n, struct trace, rb_node);
 461
 462                         if (__t->bit->device == device &&
 463                             __t->bit->sequence == sequence)
 464                                 return __t;
 465
 466                         prev = n;
 467                 }
 468         }
 469
 470         return NULL;
 471 }
 472
 473 static inline struct trace *trace_rb_find_sort(dev_t dev, unsigned long seq)
 474 {
 475         return trace_rb_find(dev, seq, &rb_sort_root, 1);
 476 }
 477
 478 static inline struct trace *trace_rb_find_last(struct per_dev_info *pdi,
 479                                                unsigned long seq)
 480 {
 481         return trace_rb_find(pdi->dev, seq, &pdi->rb_last, 0);
 482 }
 483
 484 static inline int track_rb_insert(struct per_dev_info *pdi,struct io_track *iot)
 485 {
 486         struct rb_node **p = &pdi->rb_track.rb_node;
 487         struct rb_node *parent = NULL;
 488         struct io_track *__iot;
 489
 490         while (*p) {
 491                 parent = *p;
 492                 __iot = rb_entry(parent, struct io_track, rb_node);
 493
 494                 if (iot->sector < __iot->sector)
 495                         p = &(*p)->rb_left;
 496                 else if (iot->sector > __iot->sector)
 497                         p = &(*p)->rb_right;
 498                 else {
 499                         fprintf(stderr,
 500                                 "sector alias (%Lu) on device %d,%d!\n",
 501                                 (unsigned long long) iot->sector,
 502                                 MAJOR(pdi->dev), MINOR(pdi->dev));
 503                         return 1;
 504                 }
 505         }
 506
 507         rb_link_node(&iot->rb_node, parent, p);
 508         rb_insert_color(&iot->rb_node, &pdi->rb_track);
 509         return 0;
 510 }
 511
 512 static struct io_track *__find_track(struct per_dev_info *pdi, __u64 sector)
 513 {
 514         struct rb_node *n = pdi->rb_track.rb_node;
 515         struct io_track *__iot;
 516
 517         while (n) {
 518                 __iot = rb_entry(n, struct io_track, rb_node);
 519
 520                 if (sector < __iot->sector)
 521                         n = n->rb_left;
 522                 else if (sector > __iot->sector)
 523                         n = n->rb_right;
 524                 else
 525                         return __iot;
 526         }
 527
 528         return NULL;
 529 }
 530
 531 static struct io_track *find_track(struct per_dev_info *pdi, __u32 pid,
 532                                    char *comm, __u64 sector)
 533 {
 534         struct io_track *iot;
 535
 536         iot = __find_track(pdi, sector);
 537         if (!iot) {
 538                 iot = malloc(sizeof(*iot));
 539                 iot->pid = pid;
 540                 memcpy(iot->comm, comm, sizeof(iot->comm));
 541                 iot->sector = sector;
 542                 track_rb_insert(pdi, iot);
 543         }
 544
 545         return iot;
 546 }
 547
 548 static void log_track_frontmerge(struct per_dev_info *pdi,
 549                                  struct blk_io_trace *t)
 550 {
 551         struct io_track *iot;
 552
 553         if (!track_ios)
 554                 return;
 555
 556         iot = __find_track(pdi, t->sector + t_sec(t));
 557         if (!iot) {
 558                 if (verbose)
 559                         fprintf(stderr, "merge not found for (%d,%d): %llu\n",
 560                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 561                                 (unsigned long long) t->sector + t_sec(t));
 562                 return;
 563         }
 564
 565         rb_erase(&iot->rb_node, &pdi->rb_track);
 566         iot->sector -= t_sec(t);
 567         track_rb_insert(pdi, iot);
 568 }
 569
 570 static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace *t)
 571 {
 572         struct io_track *iot;
 573
 574         if (!track_ios)
 575                 return;
 576
 577         iot = find_track(pdi, t->pid, t->comm, t->sector);
 578         iot->allocation_time = t->time;
 579 }
 580
 581 /*
 582  * return time between rq allocation and insertion
 583  */
 584 static unsigned long long log_track_insert(struct per_dev_info *pdi,
 585                                            struct blk_io_trace *t)
 586 {
 587         unsigned long long elapsed;
 588         struct io_track *iot;
 589
 590         if (!track_ios)
 591                 return -1;
 592
 593         iot = find_track(pdi, t->pid, t->comm, t->sector);
 594         iot->queue_time = t->time;
 595
 596         if (!iot->allocation_time)
 597                 return -1;
 598
 599         elapsed = iot->queue_time - iot->allocation_time;
 600
 601         if (per_process_stats) {
 602                 struct per_process_info *ppi = find_process(iot->pid,iot->comm);
 603                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 604
 605                 if (ppi && elapsed > ppi->longest_allocation_wait[w])
 606                         ppi->longest_allocation_wait[w] = elapsed;
 607         }
 608
 609         return elapsed;
 610 }
 611
 612 /*
 613  * return time between queue and issue
 614  */
 615 static unsigned long long log_track_issue(struct per_dev_info *pdi,
 616                                           struct blk_io_trace *t)
 617 {
 618         unsigned long long elapsed;
 619         struct io_track *iot;
 620
 621         if (!track_ios)
 622                 return -1;
 623         if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
 624                 return -1;
 625
 626         iot = __find_track(pdi, t->sector);
 627         if (!iot) {
 628                 if (verbose)
 629                         fprintf(stderr, "issue not found for (%d,%d): %llu\n",
 630                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 631                                 (unsigned long long) t->sector);
 632                 return -1;
 633         }
 634
 635         iot->dispatch_time = t->time;
 636         elapsed = iot->dispatch_time - iot->queue_time;
 637
 638         if (per_process_stats) {
 639                 struct per_process_info *ppi = find_process(iot->pid,iot->comm);
 640                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 641
 642                 if (ppi && elapsed > ppi->longest_dispatch_wait[w])
 643                         ppi->longest_dispatch_wait[w] = elapsed;
 644         }
 645
 646         return elapsed;
 647 }
 648
 649 /*
 650  * return time between dispatch and complete
 651  */
 652 static unsigned long long log_track_complete(struct per_dev_info *pdi,
 653                                              struct blk_io_trace *t)
 654 {
 655         unsigned long long elapsed;
 656         struct io_track *iot;
 657
 658         if (!track_ios)
 659                 return -1;
 660         if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
 661                 return -1;
 662
 663         iot = __find_track(pdi, t->sector);
 664         if (!iot) {
 665                 if (verbose)
 666                         fprintf(stderr,"complete not found for (%d,%d): %llu\n",
 667                                 MAJOR(pdi->dev), MINOR(pdi->dev),
 668                                 (unsigned long long) t->sector);
 669                 return -1;
 670         }
 671
 672         iot->completion_time = t->time;
 673         elapsed = iot->completion_time - iot->dispatch_time;
 674
 675         if (per_process_stats) {
 676                 struct per_process_info *ppi = find_process(iot->pid,iot->comm);
 677                 int w = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 678
 679                 if (ppi && elapsed > ppi->longest_completion_wait[w])
 680                         ppi->longest_completion_wait[w] = elapsed;
 681         }
 682
 683         /*
 684          * kill the trace, we don't need it after completion
 685          */
 686         rb_erase(&iot->rb_node, &pdi->rb_track);
 687         free(iot);
 688
 689         return elapsed;
 690 }
 691
 692
 693 static struct io_stats *find_process_io_stats(__u32 pid, char *name)
 694 {
 695         struct per_process_info *ppi = find_process(pid, name);
 696
 697         if (!ppi) {
 698                 ppi = malloc(sizeof(*ppi));
 699                 memset(ppi, 0, sizeof(*ppi));
 700                 memcpy(ppi->name, name, 16);
 701                 ppi->pid = pid;
 702                 add_process_to_hash(ppi);
 703                 add_process_to_list(ppi);
 704         }
 705
 706         return &ppi->io_stats;
 707 }
 708
 709 static void resize_cpu_info(struct per_dev_info *pdi, int cpu)
 710 {
 711         struct per_cpu_info *cpus = pdi->cpus;
 712         int ncpus = pdi->ncpus;
 713         int new_count = cpu + 1;
 714         int new_space, size;
 715         char *new_start;
 716
 717         size = new_count * sizeof(struct per_cpu_info);
 718         cpus = realloc(cpus, size);
 719         if (!cpus) {
 720                 char name[20];
 721                 fprintf(stderr, "Out of memory, CPU info for device %s (%d)\n",
 722                         get_dev_name(pdi, name, sizeof(name)), size);
 723                 exit(1);
 724         }
 725
 726         new_start = (char *)cpus + (ncpus * sizeof(struct per_cpu_info));
 727         new_space = (new_count - ncpus) * sizeof(struct per_cpu_info);
 728         memset(new_start, 0, new_space);
 729
 730         pdi->ncpus = new_count;
 731         pdi->cpus = cpus;
 732 }
 733
 734 static struct per_cpu_info *get_cpu_info(struct per_dev_info *pdi, int cpu)
 735 {
 736         struct per_cpu_info *pci;
 737
 738         if (cpu >= pdi->ncpus)
 739                 resize_cpu_info(pdi, cpu);
 740
 741         pci = &pdi->cpus[cpu];
 742         pci->cpu = cpu;
 743         return pci;
 744 }
 745
 746
 747 static int resize_devices(char *name)
 748 {
 749         int size = (ndevices + 1) * sizeof(struct per_dev_info);
 750
 751         devices = realloc(devices, size);
 752         if (!devices) {
 753                 fprintf(stderr, "Out of memory, device %s (%d)\n", name, size);
 754                 return 1;
 755         }
 756         memset(&devices[ndevices], 0, sizeof(struct per_dev_info));
 757         devices[ndevices].name = name;
 758         ndevices++;
 759         return 0;
 760 }
 761
 762 static struct per_dev_info *get_dev_info(dev_t dev)
 763 {
 764         struct per_dev_info *pdi;
 765         int i;
 766
 767         for (i = 0; i < ndevices; i++) {
 768                 if (!devices[i].dev)
 769                         devices[i].dev = dev;
 770                 if (devices[i].dev == dev)
 771                         return &devices[i];
 772         }
 773
 774         if (resize_devices(NULL))
 775                 return NULL;
 776
 777         pdi = &devices[ndevices - 1];
 778         pdi->dev = dev;
 779         pdi->first_reported_time = 0;
 780         pdi->last_sequence = -1;
 781         pdi->last_read_time = 0;
 782         memset(&pdi->rb_last, 0, sizeof(pdi->rb_last));
 783         pdi->rb_last_entries = 0;
 784         return pdi;
 785 }
 786
 787 static char *get_dev_name(struct per_dev_info *pdi, char *buffer, int size)
 788 {
 789         if (pdi->name)
 790                 snprintf(buffer, size, "%s", pdi->name);
 791         else
 792                 snprintf(buffer, size, "%d,%d",MAJOR(pdi->dev),MINOR(pdi->dev));
 793         return buffer;
 794 }
 795
 796 static void check_time(struct per_dev_info *pdi, struct blk_io_trace *bit)
 797 {
 798         unsigned long long this = bit->time;
 799         unsigned long long last = pdi->last_reported_time;
 800
 801         pdi->backwards = (this < last) ? 'B' : ' ';
 802         pdi->last_reported_time = this;
 803 }
 804
 805 static inline void __account_m(struct io_stats *ios, struct blk_io_trace *t,
 806                                int rw)
 807 {
 808         if (rw) {
 809                 ios->mwrites++;
 810                 ios->qwrite_kb += t_kb(t);
 811         } else {
 812                 ios->mreads++;
 813                 ios->qread_kb += t_kb(t);
 814         }
 815 }
 816
 817 static inline void account_m(struct blk_io_trace *t, struct per_cpu_info *pci,
 818                              int rw)
 819 {
 820         __account_m(&pci->io_stats, t, rw);
 821
 822         if (per_process_stats) {
 823                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 824
 825                 __account_m(ios, t, rw);
 826         }
 827 }
 828
 829 static inline void __account_queue(struct io_stats *ios, struct blk_io_trace *t,
 830                                    int rw)
 831 {
 832         if (rw) {
 833                 ios->qwrites++;
 834                 ios->qwrite_kb += t_kb(t);
 835         } else {
 836                 ios->qreads++;
 837                 ios->qread_kb += t_kb(t);
 838         }
 839 }
 840
 841 static inline void account_queue(struct blk_io_trace *t,
 842                                  struct per_cpu_info *pci, int rw)
 843 {
 844         __account_queue(&pci->io_stats, t, rw);
 845
 846         if (per_process_stats) {
 847                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 848
 849                 __account_queue(ios, t, rw);
 850         }
 851 }
 852
 853 static inline void __account_c(struct io_stats *ios, int rw, int bytes)
 854 {
 855         if (rw) {
 856                 ios->cwrites++;
 857                 ios->cwrite_kb += bytes >> 10;
 858         } else {
 859                 ios->creads++;
 860                 ios->cread_kb += bytes >> 10;
 861         }
 862 }
 863
 864 static inline void account_c(struct blk_io_trace *t, struct per_cpu_info *pci,
 865                              int rw, int bytes)
 866 {
 867         __account_c(&pci->io_stats, rw, bytes);
 868
 869         if (per_process_stats) {
 870                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 871
 872                 __account_c(ios, rw, bytes);
 873         }
 874 }
 875
 876 static inline void __account_issue(struct io_stats *ios, int rw,
 877                                    unsigned int bytes)
 878 {
 879         if (rw) {
 880                 ios->iwrites++;
 881                 ios->iwrite_kb += bytes >> 10;
 882         } else {
 883                 ios->ireads++;
 884                 ios->iread_kb += bytes >> 10;
 885         }
 886 }
 887
 888 static inline void account_issue(struct blk_io_trace *t,
 889                                  struct per_cpu_info *pci, int rw)
 890 {
 891         __account_issue(&pci->io_stats, rw, t->bytes);
 892
 893         if (per_process_stats) {
 894                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 895
 896                 __account_issue(ios, rw, t->bytes);
 897         }
 898 }
 899
 900 static inline void __account_unplug(struct io_stats *ios, int timer)
 901 {
 902         if (timer)
 903                 ios->timer_unplugs++;
 904         else
 905                 ios->io_unplugs++;
 906 }
 907
 908 static inline void account_unplug(struct blk_io_trace *t,
 909                                   struct per_cpu_info *pci, int timer)
 910 {
 911         __account_unplug(&pci->io_stats, timer);
 912
 913         if (per_process_stats) {
 914                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 915
 916                 __account_unplug(ios, timer);
 917         }
 918 }
 919
 920 static inline void __account_requeue(struct io_stats *ios,
 921                                      struct blk_io_trace *t, int rw)
 922 {
 923         if (rw) {
 924                 ios->wrqueue++;
 925                 ios->iwrite_kb -= t_kb(t);
 926         } else {
 927                 ios->rrqueue++;
 928                 ios->iread_kb -= t_kb(t);
 929         }
 930 }
 931
 932 static inline void account_requeue(struct blk_io_trace *t,
 933                                    struct per_cpu_info *pci, int rw)
 934 {
 935         __account_requeue(&pci->io_stats, t, rw);
 936
 937         if (per_process_stats) {
 938                 struct io_stats *ios = find_process_io_stats(t->pid, t->comm);
 939
 940                 __account_requeue(ios, t, rw);
 941         }
 942 }
 943
 944 static void log_complete(struct per_dev_info *pdi, struct per_cpu_info *pci,
 945                          struct blk_io_trace *t, char *act)
 946 {
 947         process_fmt(act, pci, t, log_track_complete(pdi, t), 0, NULL);
 948 }
 949
 950 static void log_insert(struct per_dev_info *pdi, struct per_cpu_info *pci,
 951                        struct blk_io_trace *t, char *act)
 952 {
 953         process_fmt(act, pci, t, log_track_insert(pdi, t), 0, NULL);
 954 }
 955
 956 static void log_queue(struct per_cpu_info *pci, struct blk_io_trace *t,
 957                       char *act)
 958 {
 959         process_fmt(act, pci, t, -1, 0, NULL);
 960 }
 961
 962 static void log_issue(struct per_dev_info *pdi, struct per_cpu_info *pci,
 963                       struct blk_io_trace *t, char *act)
 964 {
 965         process_fmt(act, pci, t, log_track_issue(pdi, t), 0, NULL);
 966 }
 967
 968 static void log_merge(struct per_dev_info *pdi, struct per_cpu_info *pci,
 969                       struct blk_io_trace *t, char *act)
 970 {
 971         if (act[0] == 'F')
 972                 log_track_frontmerge(pdi, t);
 973
 974         process_fmt(act, pci, t, -1ULL, 0, NULL);
 975 }
 976
 977 static void log_action(struct per_cpu_info *pci, struct blk_io_trace *t,
 978                         char *act)
 979 {
 980         process_fmt(act, pci, t, -1ULL, 0, NULL);
 981 }
 982
 983 static void log_generic(struct per_cpu_info *pci, struct blk_io_trace *t,
 984                         char *act)
 985 {
 986         process_fmt(act, pci, t, -1ULL, 0, NULL);
 987 }
 988
 989 static void log_unplug(struct per_cpu_info *pci, struct blk_io_trace *t,
 990                       char *act)
 991 {
 992         process_fmt(act, pci, t, -1ULL, 0, NULL);
 993 }
 994
 995 static void log_split(struct per_cpu_info *pci, struct blk_io_trace *t,
 996                       char *act)
 997 {
 998         process_fmt(act, pci, t, -1ULL, 0, NULL);
 999 }
1000
1001 static void log_pc(struct per_cpu_info *pci, struct blk_io_trace *t, char *act)
1002 {
1003         unsigned char *buf = (unsigned char *) t + sizeof(*t);
1004
1005         process_fmt(act, pci, t, -1ULL, t->pdu_len, buf);
1006 }
1007
1008 static void dump_trace_pc(struct blk_io_trace *t, struct per_cpu_info *pci)
1009 {
1010         int act = t->action & 0xffff;
1011
1012         switch (act) {
1013                 case __BLK_TA_QUEUE:
1014                         log_generic(pci, t, "Q");
1015                         break;
1016                 case __BLK_TA_GETRQ:
1017                         log_generic(pci, t, "G");
1018                         break;
1019                 case __BLK_TA_SLEEPRQ:
1020                         log_generic(pci, t, "S");
1021                         break;
1022                 case __BLK_TA_REQUEUE:
1023                         log_generic(pci, t, "R");
1024                         break;
1025                 case __BLK_TA_ISSUE:
1026                         log_pc(pci, t, "D");
1027                         break;
1028                 case __BLK_TA_COMPLETE:
1029                         log_pc(pci, t, "C");
1030                         break;
1031                 case __BLK_TA_INSERT:
1032                         log_pc(pci, t, "I");
1033                         break;
1034                 default:
1035                         fprintf(stderr, "Bad pc action %x\n", act);
1036                         break;
1037         }
1038 }
1039
1040 static void dump_trace_fs(struct blk_io_trace *t, struct per_dev_info *pdi,
1041                           struct per_cpu_info *pci)
1042 {
1043         int w = t->action & BLK_TC_ACT(BLK_TC_WRITE);
1044         int act = t->action & 0xffff;
1045
1046         switch (act) {
1047                 case __BLK_TA_QUEUE:
1048                         account_queue(t, pci, w);
1049                         log_queue(pci, t, "Q");
1050                         break;
1051                 case __BLK_TA_INSERT:
1052                         log_insert(pdi, pci, t, "I");
1053                         break;
1054                 case __BLK_TA_BACKMERGE:
1055                         account_m(t, pci, w);
1056                         log_merge(pdi, pci, t, "M");
1057                         break;
1058                 case __BLK_TA_FRONTMERGE:
1059                         account_m(t, pci, w);
1060                         log_merge(pdi, pci, t, "F");
1061                         break;
1062                 case __BLK_TA_GETRQ:
1063                         log_track_getrq(pdi, t);
1064                         log_generic(pci, t, "G");
1065                         break;
1066                 case __BLK_TA_SLEEPRQ:
1067                         log_generic(pci, t, "S");
1068                         break;
1069                 case __BLK_TA_REQUEUE:
1070                         account_requeue(t, pci, w);
1071                         log_queue(pci, t, "R");
1072                         break;
1073                 case __BLK_TA_ISSUE:
1074                         account_issue(t, pci, w);
1075                         log_issue(pdi, pci, t, "D");
1076                         break;
1077                 case __BLK_TA_COMPLETE:
1078                         account_c(t, pci, w, t->bytes);
1079                         log_complete(pdi, pci, t, "C");
1080                         break;
1081                 case __BLK_TA_PLUG:
1082                         log_action(pci, t, "P");
1083                         break;
1084                 case __BLK_TA_UNPLUG_IO:
1085                         account_unplug(t, pci, 0);
1086                         log_unplug(pci, t, "U");
1087                         break;
1088                 case __BLK_TA_UNPLUG_TIMER:
1089                         account_unplug(t, pci, 1);
1090                         log_unplug(pci, t, "UT");
1091                         break;
1092                 case __BLK_TA_SPLIT:
1093                         log_split(pci, t, "X");
1094                         break;
1095                 case __BLK_TA_BOUNCE:
1096                         log_generic(pci, t, "B");
1097                         break;
1098                 case __BLK_TA_REMAP:
1099                         log_generic(pci, t, "A");
1100                         break;
1101                 default:
1102                         fprintf(stderr, "Bad fs action %x\n", t->action);
1103                         break;
1104         }
1105 }
1106
1107 static void dump_trace(struct blk_io_trace *t, struct per_cpu_info *pci,
1108                        struct per_dev_info *pdi)
1109 {
1110         if (t->action & BLK_TC_ACT(BLK_TC_PC))
1111                 dump_trace_pc(t, pci);
1112         else
1113                 dump_trace_fs(t, pdi, pci);
1114
1115         if (!pdi->events)
1116                 pdi->first_reported_time = t->time;
1117
1118         pdi->events++;
1119 }
1120
1121 /*
1122  * print in a proper way, not too small and not too big. if more than
1123  * 1000,000K, turn into M and so on
1124  */
1125 static char *size_cnv(char *dst, unsigned long long num, int in_kb)
1126 {
1127         char suff[] = { '\0', 'K', 'M', 'G', 'P' };
1128         unsigned int i = 0;
1129
1130         if (in_kb)
1131                 i++;
1132
1133         while (num > 1000 * 1000ULL && (i < sizeof(suff) - 1)) {
1134                 i++;
1135                 num /= 1000;
1136         }
1137
1138         sprintf(dst, "%'8Lu%c", num, suff[i]);
1139         return dst;
1140 }
1141
1142 static void dump_io_stats(struct io_stats *ios, char *msg)
1143 {
1144         static char x[256], y[256];
1145
1146         fprintf(ofp, "%s\n", msg);
1147
1148         fprintf(ofp, " Reads Queued:    %s, %siB\t", size_cnv(x, ios->qreads, 0), size_cnv(y, ios->qread_kb, 1));
1149         fprintf(ofp, " Writes Queued:    %s, %siB\n", size_cnv(x, ios->qwrites, 0), size_cnv(y, ios->qwrite_kb, 1));
1150
1151         fprintf(ofp, " Read Dispatches: %s, %siB\t", size_cnv(x, ios->ireads, 0), size_cnv(y, ios->iread_kb, 1));
1152         fprintf(ofp, " Write Dispatches: %s, %siB\n", size_cnv(x, ios->iwrites, 0), size_cnv(y, ios->iwrite_kb, 1));
1153         fprintf(ofp, " Reads Requeued:  %s\t\t", size_cnv(x, ios->rrqueue, 0));
1154         fprintf(ofp, " Writes Requeued:  %s\n", size_cnv(x, ios->wrqueue, 0));
1155         fprintf(ofp, " Reads Completed: %s, %siB\t", size_cnv(x, ios->creads, 0), size_cnv(y, ios->cread_kb, 1));
1156         fprintf(ofp, " Writes Completed: %s, %siB\n", size_cnv(x, ios->cwrites, 0), size_cnv(y, ios->cwrite_kb, 1));
1157         fprintf(ofp, " Read Merges:     %'8lu%8c\t", ios->mreads, ' ');
1158         fprintf(ofp, " Write Merges:     %'8lu\n", ios->mwrites);
1159         fprintf(ofp, " IO unplugs:      %'8lu%8c\t", ios->io_unplugs, ' ');
1160         fprintf(ofp, " Timer unplugs:    %'8lu\n", ios->timer_unplugs);
1161 }
1162
1163 static void dump_wait_stats(struct per_process_info *ppi)
1164 {
1165         unsigned long rawait = ppi->longest_allocation_wait[0] / 1000;
1166         unsigned long rdwait = ppi->longest_dispatch_wait[0] / 1000;
1167         unsigned long rcwait = ppi->longest_completion_wait[0] / 1000;
1168         unsigned long wawait = ppi->longest_allocation_wait[1] / 1000;
1169         unsigned long wdwait = ppi->longest_dispatch_wait[1] / 1000;
1170         unsigned long wcwait = ppi->longest_completion_wait[1] / 1000;
1171
1172         fprintf(ofp, " Allocation wait: %'8lu%8c\t", rawait, ' ');
1173         fprintf(ofp, " Allocation wait:  %'8lu\n", wawait);
1174         fprintf(ofp, " Dispatch wait:   %'8lu%8c\t", rdwait, ' ');
1175         fprintf(ofp, " Dispatch wait:    %'8lu\n", wdwait);
1176         fprintf(ofp, " Completion wait: %'8lu%8c\t", rcwait, ' ');
1177         fprintf(ofp, " Completion wait:  %'8lu\n", wcwait);
1178 }
1179
1180 static int ppi_name_compare(const void *p1, const void *p2)
1181 {
1182         struct per_process_info *ppi1 = *((struct per_process_info **) p1);
1183         struct per_process_info *ppi2 = *((struct per_process_info **) p2);
1184         int res;
1185
1186         res = strverscmp(ppi1->name, ppi2->name);
1187         if (!res)
1188                 res = ppi1->pid > ppi2->pid;
1189
1190         return res;
1191 }
1192
1193 static void sort_process_list(void)
1194 {
1195         struct per_process_info **ppis;
1196         struct per_process_info *ppi;
1197         int i = 0;
1198
1199         ppis = malloc(ppi_list_entries * sizeof(struct per_process_info *));
1200
1201         ppi = ppi_list;
1202         while (ppi) {
1203                 ppis[i++] = ppi;
1204                 ppi = ppi->list_next;
1205         }
1206
1207         qsort(ppis, ppi_list_entries, sizeof(ppi), ppi_name_compare);
1208
1209         i = ppi_list_entries - 1;
1210         ppi_list = NULL;
1211         while (i >= 0) {
1212                 ppi = ppis[i];
1213
1214                 ppi->list_next = ppi_list;
1215                 ppi_list = ppi;
1216                 i--;
1217         }
1218
1219         free(ppis);
1220 }
1221
1222 static void show_process_stats(void)
1223 {
1224         struct per_process_info *ppi;
1225
1226         sort_process_list();
1227
1228         ppi = ppi_list;
1229         while (ppi) {
1230                 char name[64];
1231
1232                 if (ppi->more_than_one)
1233                         sprintf(name, "%s (%u, ...)", ppi->name, ppi->pid);
1234                 else
1235                         sprintf(name, "%s (%u)", ppi->name, ppi->pid);
1236
1237                 dump_io_stats(&ppi->io_stats, name);
1238                 dump_wait_stats(ppi);
1239                 ppi = ppi->list_next;
1240         }
1241
1242         fprintf(ofp, "\n");
1243 }
1244
1245 static void show_device_and_cpu_stats(void)
1246 {
1247         struct per_dev_info *pdi;
1248         struct per_cpu_info *pci;
1249         struct io_stats total, *ios;
1250         unsigned long long rrate, wrate, msec;
1251         int i, j, pci_events;
1252         char line[3 + 8/*cpu*/ + 2 + 32/*dev*/ + 3];
1253         char name[32];
1254
1255         for (pdi = devices, i = 0; i < ndevices; i++, pdi++) {
1256
1257                 memset(&total, 0, sizeof(total));
1258                 pci_events = 0;
1259
1260                 if (i > 0)
1261                         fprintf(ofp, "\n");
1262
1263                 for (pci = pdi->cpus, j = 0; j < pdi->ncpus; j++, pci++) {
1264                         if (!pci->nelems)
1265                                 continue;
1266
1267                         ios = &pci->io_stats;
1268                         total.qreads += ios->qreads;
1269                         total.qwrites += ios->qwrites;
1270                         total.creads += ios->creads;
1271                         total.cwrites += ios->cwrites;
1272                         total.mreads += ios->mreads;
1273                         total.mwrites += ios->mwrites;
1274                         total.ireads += ios->ireads;
1275                         total.iwrites += ios->iwrites;
1276                         total.rrqueue += ios->rrqueue;
1277                         total.wrqueue += ios->wrqueue;
1278                         total.qread_kb += ios->qread_kb;
1279                         total.qwrite_kb += ios->qwrite_kb;
1280                         total.cread_kb += ios->cread_kb;
1281                         total.cwrite_kb += ios->cwrite_kb;
1282                         total.iread_kb += ios->iread_kb;
1283                         total.iwrite_kb += ios->iwrite_kb;
1284                         total.timer_unplugs += ios->timer_unplugs;
1285                         total.io_unplugs += ios->io_unplugs;
1286
1287                         snprintf(line, sizeof(line) - 1, "CPU%d (%s):",
1288                                  j, get_dev_name(pdi, name, sizeof(name)));
1289                         dump_io_stats(ios, line);
1290                         pci_events++;
1291                 }
1292
1293                 if (pci_events > 1) {
1294                         fprintf(ofp, "\n");
1295                         snprintf(line, sizeof(line) - 1, "Total (%s):",
1296                                  get_dev_name(pdi, name, sizeof(name)));
1297                         dump_io_stats(&total, line);
1298                 }
1299
1300                 wrate = rrate = 0;
1301                 msec = (pdi->last_reported_time - pdi->first_reported_time) / 1000000;
1302                 if (msec) {
1303                         rrate = 1000 * total.cread_kb / msec;
1304                         wrate = 1000 * total.cwrite_kb / msec;
1305                 }
1306
1307                 fprintf(ofp, "\nThroughput (R/W): %'LuKiB/s / %'LuKiB/s\n",
1308                         rrate, wrate);
1309                 fprintf(ofp, "Events (%s): %'Lu entries\n",
1310                         get_dev_name(pdi, line, sizeof(line)), pdi->events);
1311                 fprintf(ofp, "Skips: %'lu forward (%'llu - %5.1lf%%) %'lu backward (%'llu - %5.1lf%%)\n",
1312                         pdi->skips,pdi->seq_skips,
1313                         100.0 * ((double)pdi->seq_skips /
1314                                 (double)(pdi->events + pdi->seq_skips)),
1315                         pdi->nskips,pdi->seq_nskips,
1316                         100.0 * ((double)pdi->seq_nskips /
1317                                 (double)(pdi->events + pdi->seq_skips)));
1318         }
1319 }
1320
1321 /*
1322  * struct trace and blktrace allocation cache, we do potentially
1323  * millions of mallocs for these structures while only using at most
1324  * a few thousand at the time
1325  */
1326 static inline void t_free(struct trace *t)
1327 {
1328         if (t_alloc_cache < 1024) {
1329                 t->next = t_alloc_list;
1330                 t_alloc_list = t;
1331                 t_alloc_cache++;
1332         } else
1333                 free(t);
1334 }
1335
1336 static inline struct trace *t_alloc(void)
1337 {
1338         struct trace *t = t_alloc_list;
1339
1340         if (t) {
1341                 t_alloc_list = t->next;
1342                 t_alloc_cache--;
1343                 return t;
1344         }
1345
1346         return malloc(sizeof(*t));
1347 }
1348
1349 static inline void bit_free(struct blk_io_trace *bit)
1350 {
1351         if (bit_alloc_cache < 1024 && !bit->pdu_len) {
1352                 /*
1353                  * abuse a 64-bit field for a next pointer for the free item
1354                  */
1355                 bit->time = (__u64) (unsigned long) bit_alloc_list;
1356                 bit_alloc_list = (struct blk_io_trace *) bit;
1357                 bit_alloc_cache++;
1358         } else
1359                 free(bit);
1360 }
1361
1362 static inline struct blk_io_trace *bit_alloc(void)
1363 {
1364         struct blk_io_trace *bit = bit_alloc_list;
1365
1366         if (bit) {
1367                 bit_alloc_list = (struct blk_io_trace *) (unsigned long) \
1368                                  bit->time;
1369                 bit_alloc_cache--;
1370                 return bit;
1371         }
1372
1373         return malloc(sizeof(*bit));
1374 }
1375
1376 static void find_genesis(void)
1377 {
1378         struct trace *t = trace_list;
1379
1380         genesis_time = -1ULL;
1381         while (t != NULL) {
1382                 if (t->bit->time < genesis_time)
1383                         genesis_time = t->bit->time;
1384
1385                 t = t->next;
1386         }
1387 }
1388
1389 static inline int check_stopwatch(struct blk_io_trace *bit)
1390 {
1391         if (bit->time < stopwatch_end &&
1392             bit->time >= stopwatch_start)
1393                 return 0;
1394
1395         return 1;
1396 }
1397
1398 /*
1399  * return youngest entry read
1400  */
1401 static int sort_entries(unsigned long long *youngest)
1402 {
1403         struct trace *t;
1404
1405         if (!genesis_time)
1406                 find_genesis();
1407
1408         *youngest = 0;
1409         while ((t = trace_list) != NULL) {
1410                 struct blk_io_trace *bit = t->bit;
1411
1412                 trace_list = t->next;
1413
1414                 bit->time -= genesis_time;
1415
1416                 if (bit->time < *youngest || !*youngest)
1417                         *youngest = bit->time;
1418
1419                 if (bit->sequence < smallest_seq_read)
1420                         smallest_seq_read = bit->sequence;
1421
1422                 if (check_stopwatch(bit)) {
1423                         bit_free(bit);
1424                         t_free(t);
1425                         continue;
1426                 }
1427
1428                 if (trace_rb_insert_sort(t))
1429                         return -1;
1430         }
1431
1432         return 0;
1433 }
1434
1435 static inline void __put_trace_last(struct per_dev_info *pdi, struct trace *t)
1436 {
1437         rb_erase(&t->rb_node, &pdi->rb_last);
1438         pdi->rb_last_entries--;
1439
1440         bit_free(t->bit);
1441         t_free(t);
1442 }
1443
1444 static void put_trace(struct per_dev_info *pdi, struct trace *t)
1445 {
1446         rb_erase(&t->rb_node, &rb_sort_root);
1447         rb_sort_entries--;
1448
1449         trace_rb_insert_last(pdi, t);
1450
1451         if (pdi->rb_last_entries > rb_batch * pdi->nfiles) {
1452                 struct rb_node *n = rb_first(&pdi->rb_last);
1453
1454                 t = rb_entry(n, struct trace, rb_node);
1455                 __put_trace_last(pdi, t);
1456         }
1457 }
1458
1459 /*
1460  * to continue, we must have traces from all online cpus in the tree
1461  */
1462 static int check_cpu_map(struct per_dev_info *pdi)
1463 {
1464         unsigned long *cpu_map;
1465         struct rb_node *n;
1466         struct trace *__t;
1467         unsigned int i;
1468         int ret, cpu;
1469
1470         /*
1471          * create a map of the cpus we have traces for
1472          */
1473         cpu_map = malloc(pdi->cpu_map_max / sizeof(long));
1474         n = rb_first(&rb_sort_root);
1475         while (n) {
1476                 __t = rb_entry(n, struct trace, rb_node);
1477                 cpu = __t->bit->cpu;
1478
1479                 cpu_map[CPU_IDX(cpu)] |= (1UL << CPU_BIT(cpu));
1480                 n = rb_next(n);
1481         }
1482
1483         /*
1484          * we can't continue if pdi->cpu_map has entries set that we don't
1485          * have in the sort rbtree. the opposite is not a problem, though
1486          */
1487         ret = 0;
1488         for (i = 0; i < pdi->cpu_map_max / CPUS_PER_LONG; i++) {
1489                 if (pdi->cpu_map[i] & ~(cpu_map[i])) {
1490                         ret = 1;
1491                         break;
1492                 }
1493         }
1494
1495         free(cpu_map);
1496         return ret;
1497 }
1498
1499 static int check_sequence(struct per_dev_info *pdi, struct trace *t, int force)
1500 {
1501         unsigned long expected_sequence = pdi->last_sequence + 1;
1502         struct blk_io_trace *bit = t->bit;
1503         struct trace *__t;
1504
1505         if (!expected_sequence) {
1506                 /*
1507                  * 1 should be the first entry, just allow it
1508                  */
1509                 if (bit->sequence == 1)
1510                         return 0;
1511
1512                 return check_cpu_map(pdi);
1513         }
1514
1515         if (bit->sequence == expected_sequence)
1516                 return 0;
1517
1518         /*
1519          * we may not have seen that sequence yet. if we are not doing
1520          * the final run, break and wait for more entries.
1521          */
1522         if (expected_sequence < smallest_seq_read) {
1523                 __t = trace_rb_find_last(pdi, expected_sequence);
1524                 if (!__t)
1525                         goto skip;
1526
1527                 __put_trace_last(pdi, __t);
1528                 return 0;
1529         } else if (!force) {
1530                 return 1;
1531         } else {
1532 skip:
1533                 if (verbose) {
1534                         fprintf(stderr, "(%d,%d): skipping %lu -> %u\n",
1535                                 MAJOR(pdi->dev), MINOR(pdi->dev),
1536                                 pdi->last_sequence, bit->sequence);
1537                 }
1538                 if (bit->sequence > pdi->last_sequence) {
1539                         pdi->skips++;
1540                         pdi->seq_skips += (bit->sequence - pdi->last_sequence);
1541                 } else {
1542                         pdi->nskips++;
1543                         pdi->seq_nskips += (pdi->last_sequence - bit->sequence);
1544                 }
1545                 return 0;
1546         }
1547 }
1548
1549 static void show_entries_rb(int force)
1550 {
1551         struct per_dev_info *pdi = NULL;
1552         struct per_cpu_info *pci = NULL;
1553         struct blk_io_trace *bit;
1554         struct rb_node *n;
1555         struct trace *t;
1556
1557         while ((n = rb_first(&rb_sort_root)) != NULL) {
1558                 if (is_done() && !force && !pipeline)
1559                         break;
1560
1561                 t = rb_entry(n, struct trace, rb_node);
1562                 bit = t->bit;
1563
1564                 if (!pdi || pdi->dev != bit->device)
1565                         pdi = get_dev_info(bit->device);
1566
1567                 if (!pdi) {
1568                         fprintf(stderr, "Unknown device ID? (%d,%d)\n",
1569                                 MAJOR(bit->device), MINOR(bit->device));
1570                         break;
1571                 }
1572
1573                 if (check_sequence(pdi, t, force))
1574                         break;
1575
1576                 if (!force && bit->time > last_allowed_time)
1577                         break;
1578
1579                 pdi->last_sequence = bit->sequence;
1580
1581                 check_time(pdi, bit);
1582
1583                 if (!pci || pci->cpu != bit->cpu)
1584                         pci = get_cpu_info(pdi, bit->cpu);
1585
1586                 pci->nelems++;
1587
1588                 if (bit->action & (act_mask << BLK_TC_SHIFT))
1589                         dump_trace(bit, pci, pdi);
1590
1591                 put_trace(pdi, t);
1592         }
1593 }
1594
1595 static int read_data(int fd, void *buffer, int bytes, int block)
1596 {
1597         int ret, bytes_left, fl;
1598         void *p;
1599
1600         fl = fcntl(fd, F_GETFL);
1601
1602         if (!block)
1603                 fcntl(fd, F_SETFL, fl | O_NONBLOCK);
1604         else
1605                 fcntl(fd, F_SETFL, fl & ~O_NONBLOCK);
1606
1607         bytes_left = bytes;
1608         p = buffer;
1609         while (bytes_left > 0) {
1610                 ret = read(fd, p, bytes_left);
1611                 if (!ret)
1612                         return 1;
1613                 else if (ret < 0) {
1614                         if (errno != EAGAIN)
1615                                 perror("read");
1616
1617                         return -1;
1618                 } else {
1619                         p += ret;
1620                         bytes_left -= ret;
1621                 }
1622         }
1623
1624         return 0;
1625 }
1626
1627 static int read_events(int fd, int always_block)
1628 {
1629         struct per_dev_info *pdi = NULL;
1630         unsigned int events = 0;
1631
1632         while (!is_done() && events < rb_batch) {
1633                 struct blk_io_trace *bit;
1634                 struct trace *t;
1635                 int pdu_len;
1636                 __u32 magic;
1637
1638                 bit = bit_alloc();
1639
1640                 if (read_data(fd, bit, sizeof(*bit), !events || always_block)) {
1641                         bit_free(bit);
1642                         break;
1643                 }
1644
1645                 magic = be32_to_cpu(bit->magic);
1646                 if ((magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
1647                         fprintf(stderr, "Bad magic %x\n", magic);
1648                         break;
1649                 }
1650
1651                 pdu_len = be16_to_cpu(bit->pdu_len);
1652                 if (pdu_len) {
1653                         void *ptr = realloc(bit, sizeof(*bit) + pdu_len);
1654
1655                         if (read_data(fd, ptr + sizeof(*bit), pdu_len, 1)) {
1656                                 bit_free(ptr);
1657                                 break;
1658                         }
1659
1660                         bit = ptr;
1661                 }
1662
1663                 trace_to_cpu(bit);
1664
1665                 if (verify_trace(bit)) {
1666                         bit_free(bit);
1667                         continue;
1668                 }
1669
1670                 t = t_alloc();
1671                 memset(t, 0, sizeof(*t));
1672                 t->bit = bit;
1673
1674                 t->next = trace_list;
1675                 trace_list = t;
1676
1677                 if (!pdi || pdi->dev != bit->device)
1678                         pdi = get_dev_info(bit->device);
1679
1680                 if (bit->time > pdi->last_read_time)
1681                         pdi->last_read_time = bit->time;
1682
1683                 events++;
1684         }
1685
1686         return events;
1687 }
1688
1689 static int do_file(void)
1690 {
1691         struct per_cpu_info *pci;
1692         struct per_dev_info *pdi;
1693         int i, j, events, events_added;
1694
1695         /*
1696          * first prepare all files for reading
1697          */
1698         for (i = 0; i < ndevices; i++) {
1699                 pdi = &devices[i];
1700                 pdi->nfiles = 0;
1701                 pdi->last_sequence = -1;
1702
1703                 for (j = 0;; j++) {
1704                         struct stat st;
1705                         int len = 0;
1706                         char *p, *dname;
1707
1708                         pci = get_cpu_info(pdi, j);
1709                         pci->cpu = j;
1710                         pci->fd = -1;
1711
1712                         p = strdup(pdi->name);
1713                         dname = dirname(p);
1714                         if (strcmp(dname, ".")) {
1715                                 input_dir = dname;
1716                                 p = strdup(pdi->name);
1717                                 strcpy(pdi->name, basename(p));
1718                         }
1719                         free(p);
1720
1721                         if (input_dir)
1722                                 len = sprintf(pci->fname, "%s/", input_dir);
1723
1724                         snprintf(pci->fname + len, sizeof(pci->fname)-1-len,
1725                                  "%s.blktrace.%d", pdi->name, pci->cpu);
1726                         if (stat(pci->fname, &st) < 0)
1727                                 break;
1728                         if (st.st_size) {
1729                                 pci->fd = open(pci->fname, O_RDONLY);
1730                                 if (pci->fd < 0) {
1731                                         perror(pci->fname);
1732                                         continue;
1733                                 }
1734                         }
1735
1736                         printf("Input file %s added\n", pci->fname);
1737                         pdi->nfiles++;
1738                         cpu_mark_online(pdi, pci->cpu);
1739                 }
1740         }
1741
1742         /*
1743          * now loop over the files reading in the data
1744          */
1745         do {
1746                 unsigned long long youngest;
1747
1748                 events_added = 0;
1749                 last_allowed_time = -1ULL;
1750                 smallest_seq_read = -1U;
1751
1752                 for (i = 0; i < ndevices; i++) {
1753                         pdi = &devices[i];
1754
1755                         for (j = 0; j < pdi->nfiles; j++) {
1756
1757                                 pci = get_cpu_info(pdi, j);
1758
1759                                 if (pci->fd == -1)
1760                                         continue;
1761
1762                                 events = read_events(pci->fd, 1);
1763                                 if (!events) {
1764                                         cpu_mark_offline(pdi, pci->cpu);
1765                                         close(pci->fd);
1766                                         pci->fd = -1;
1767                                         continue;
1768                                 }
1769
1770                                 if (pdi->last_read_time < last_allowed_time)
1771                                         last_allowed_time = pdi->last_read_time;
1772
1773                                 events_added += events;
1774                         }
1775                 }
1776
1777                 if (sort_entries(&youngest))
1778                         break;
1779
1780                 if (youngest > stopwatch_end)
1781                         break;
1782
1783                 show_entries_rb(0);
1784
1785         } while (events_added);
1786
1787         if (rb_sort_entries)
1788                 show_entries_rb(1);
1789
1790         return 0;
1791 }
1792
1793 static int do_stdin(void)
1794 {
1795         unsigned long long youngest;
1796         int fd, events;
1797
1798         last_allowed_time = -1ULL;
1799         fd = dup(STDIN_FILENO);
1800         if (fd == -1) {
1801                 perror("dup stdin");
1802                 return -1;
1803         }
1804
1805         while ((events = read_events(fd, 0)) != 0) {
1806
1807                 smallest_seq_read = -1U;
1808
1809                 if (sort_entries(&youngest))
1810                         break;
1811
1812                 if (youngest > stopwatch_end)
1813                         break;
1814
1815                 show_entries_rb(0);
1816         }
1817
1818         if (rb_sort_entries)
1819                 show_entries_rb(1);
1820
1821         close(fd);
1822         return 0;
1823 }
1824
1825 static void show_stats(void)
1826 {
1827         if (!ofp)
1828                 return;
1829         if (stats_printed)
1830                 return;
1831
1832         stats_printed = 1;
1833
1834         if (per_process_stats)
1835                 show_process_stats();
1836
1837         if (per_device_and_cpu_stats)
1838                 show_device_and_cpu_stats();
1839
1840         fflush(ofp);
1841 }
1842
1843 static void handle_sigint(__attribute__((__unused__)) int sig)
1844 {
1845         done = 1;
1846         show_stats();
1847 }
1848
1849 /*
1850  * Extract start and duration times from a string, allowing
1851  * us to specify a time interval of interest within a trace.
1852  * Format: "duration" (start is zero) or "start:duration".
1853  */
1854 static int find_stopwatch_interval(char *string)
1855 {
1856         double value;
1857         char *sp;
1858
1859         value = strtod(string, &sp);
1860         if (sp == string) {
1861                 fprintf(stderr,"Invalid stopwatch timer: %s\n", string);
1862                 return 1;
1863         }
1864         if (*sp == ':') {
1865                 stopwatch_start = DOUBLE_TO_NANO_ULL(value);
1866                 string = sp + 1;
1867                 value = strtod(string, &sp);
1868                 if (sp == string || *sp != '\0') {
1869                         fprintf(stderr,"Invalid stopwatch duration time: %s\n",
1870                                 string);
1871                         return 1;
1872                 }
1873         } else if (*sp != '\0') {
1874                 fprintf(stderr,"Invalid stopwatch start timer: %s\n", string);
1875                 return 1;
1876         }
1877         stopwatch_end = DOUBLE_TO_NANO_ULL(value);
1878         if (stopwatch_end <= stopwatch_start) {
1879                 fprintf(stderr, "Invalid stopwatch interval: %Lu -> %Lu\n",
1880                         stopwatch_start, stopwatch_end);
1881                 return 1;
1882         }
1883
1884         return 0;
1885 }
1886
1887 static char usage_str[] = \
1888         "[ -i <input name> ] [-o <output name> [ -s ] [ -t ] [ -q ]\n" \
1889         "[ -w start:stop ] [ -f output format ] [ -F format spec ] [ -v] \n\n" \
1890         "\t-i Input file containing trace data, or '-' for stdin\n" \
1891         "\t-D Directory to prepend to input file names\n" \
1892         "\t-o Output file. If not given, output is stdout\n" \
1893         "\t-b stdin read batching\n" \
1894         "\t-s Show per-program io statistics\n" \
1895         "\t-n Hash processes by name, not pid\n" \
1896         "\t-t Track individual ios. Will tell you the time a request took\n" \
1897         "\t   to get queued, to get dispatched, and to get completed\n" \
1898         "\t-q Quiet. Don't display any stats at the end of the trace\n" \
1899         "\t-w Only parse data between the given time interval in seconds.\n" \
1900         "\t   If 'start' isn't given, blkparse defaults the start time to 0\n" \
1901         "\t-f Output format. Customize the output format. The format field\n" \
1902         "\t   identifies can be found in the documentation\n" \
1903         "\t-F Format specification. Can be found in the documentation\n" \
1904         "\t-v More verbose for marginal errors\n" \
1905         "\t-V Print program version info\n\n";
1906
1907 static void usage(char *prog)
1908 {
1909         fprintf(stderr, "Usage: %s %s %s", prog, blkparse_version, usage_str);
1910 }
1911
1912 int main(int argc, char *argv[])
1913 {
1914         char *ofp_buffer;
1915         int i, c, ret, mode;
1916         int act_mask_tmp = 0;
1917
1918         while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) != -1) {
1919                 switch (c) {
1920                 case 'a':
1921                         i = find_mask_map(optarg);
1922                         if (i < 0) {
1923                                 fprintf(stderr,"Invalid action mask %s\n",
1924                                         optarg);
1925                                 return 1;
1926                         }
1927                         act_mask_tmp |= i;
1928                         break;
1929
1930                 case 'A':
1931                         if ((sscanf(optarg, "%x", &i) != 1) ||
1932                                                         !valid_act_opt(i)) {
1933                                 fprintf(stderr,
1934                                         "Invalid set action mask %s/0x%x\n",
1935                                         optarg, i);
1936                                 return 1;
1937                         }
1938                         act_mask_tmp = i;
1939                         break;
1940                 case 'i':
1941                         if (!strcmp(optarg, "-") && !pipeline)
1942                                 pipeline = 1;
1943                         else if (resize_devices(optarg) != 0)
1944                                 return 1;
1945                         break;
1946                 case 'D':
1947                         input_dir = optarg;
1948                         break;
1949                 case 'o':
1950                         output_name = optarg;
1951                         break;
1952                 case 'b':
1953                         rb_batch = atoi(optarg);
1954                         if (rb_batch <= 0)
1955                                 rb_batch = RB_BATCH_DEFAULT;
1956                         break;
1957                 case 's':
1958                         per_process_stats = 1;
1959                         break;
1960                 case 't':
1961                         track_ios = 1;
1962                         break;
1963                 case 'q':
1964                         per_device_and_cpu_stats = 0;
1965                         break;
1966                 case 'w':
1967                         if (find_stopwatch_interval(optarg) != 0)
1968                                 return 1;
1969                         break;
1970                 case 'f':
1971                         set_all_format_specs(optarg);
1972                         break;
1973                 case 'F':
1974                         if (add_format_spec(optarg) != 0)
1975                                 return 1;
1976                         break;
1977                 case 'h':
1978                         ppi_hash_by_pid = 0;
1979                         break;
1980                 case 'v':
1981                         verbose++;
1982                         break;
1983                 case 'V':
1984                         printf("%s version %s\n", argv[0], blkparse_version);
1985                         return 0;
1986                 default:
1987                         usage(argv[0]);
1988                         return 1;
1989                 }
1990         }
1991
1992         while (optind < argc) {
1993                 if (!strcmp(argv[optind], "-") && !pipeline)
1994                         pipeline = 1;
1995                 else if (resize_devices(argv[optind]) != 0)
1996                         return 1;
1997                 optind++;
1998         }
1999
2000         if (!pipeline && !ndevices) {
2001                 usage(argv[0]);
2002                 return 1;
2003         }
2004
2005         if (act_mask_tmp != 0)
2006                 act_mask = act_mask_tmp;
2007
2008         memset(&rb_sort_root, 0, sizeof(rb_sort_root));
2009
2010         signal(SIGINT, handle_sigint);
2011         signal(SIGHUP, handle_sigint);
2012         signal(SIGTERM, handle_sigint);
2013
2014         setlocale(LC_NUMERIC, "en_US");
2015
2016         if (!output_name) {
2017                 ofp = fdopen(STDOUT_FILENO, "w");
2018                 mode = _IOLBF;
2019         } else {
2020                 char ofname[128];
2021
2022                 snprintf(ofname, sizeof(ofname) - 1, "%s", output_name);
2023                 ofp = fopen(ofname, "w");
2024                 mode = _IOFBF;
2025         }
2026
2027         if (!ofp) {
2028                 perror("fopen");
2029                 return 1;
2030         }
2031
2032         ofp_buffer = malloc(4096);
2033         if (setvbuf(ofp, ofp_buffer, mode, 4096)) {
2034                 perror("setvbuf");
2035                 return 1;
2036         }
2037
2038         if (pipeline)
2039                 ret = do_stdin();
2040         else
2041                 ret = do_file();
2042
2043         show_stats();
2044         free(ofp_buffer);
2045         return ret;
2046 }