tools/perf/builtin-lock.c

   1 #include "builtin.h"
   2 #include "perf.h"
   3
   4 #include "util/evlist.h"
   5 #include "util/evsel.h"
   6 #include "util/util.h"
   7 #include "util/cache.h"
   8 #include "util/symbol.h"
   9 #include "util/thread.h"
  10 #include "util/header.h"
  11
  12 #include "util/parse-options.h"
  13 #include "util/trace-event.h"
  14
  15 #include "util/debug.h"
  16 #include "util/session.h"
  17 #include "util/tool.h"
  18
  19 #include <sys/types.h>
  20 #include <sys/prctl.h>
  21 #include <semaphore.h>
  22 #include <pthread.h>
  23 #include <math.h>
  24 #include <limits.h>
  25
  26 #include <linux/list.h>
  27 #include <linux/hash.h>
  28
  29 static struct perf_session *session;
  30
  31 /* based on kernel/lockdep.c */
  32 #define LOCKHASH_BITS           12
  33 #define LOCKHASH_SIZE           (1UL << LOCKHASH_BITS)
  34
  35 static struct list_head lockhash_table[LOCKHASH_SIZE];
  36
  37 #define __lockhashfn(key)       hash_long((unsigned long)key, LOCKHASH_BITS)
  38 #define lockhashentry(key)      (lockhash_table + __lockhashfn((key)))
  39
  40 struct lock_stat {
  41         struct list_head        hash_entry;
  42         struct rb_node          rb;             /* used for sorting */
  43
  44         /*
  45          * FIXME: perf_evsel__intval() returns u64,
  46          * so address of lockdep_map should be dealed as 64bit.
  47          * Is there more better solution?
  48          */
  49         void                    *addr;          /* address of lockdep_map, used as ID */
  50         char                    *name;          /* for strcpy(), we cannot use const */
  51
  52         unsigned int            nr_acquire;
  53         unsigned int            nr_acquired;
  54         unsigned int            nr_contended;
  55         unsigned int            nr_release;
  56
  57         unsigned int            nr_readlock;
  58         unsigned int            nr_trylock;
  59         /* these times are in nano sec. */
  60         u64                     wait_time_total;
  61         u64                     wait_time_min;
  62         u64                     wait_time_max;
  63
  64         int                     discard; /* flag of blacklist */
  65 };
  66
  67 /*
  68  * States of lock_seq_stat
  69  *
  70  * UNINITIALIZED is required for detecting first event of acquire.
  71  * As the nature of lock events, there is no guarantee
  72  * that the first event for the locks are acquire,
  73  * it can be acquired, contended or release.
  74  */
  75 #define SEQ_STATE_UNINITIALIZED      0         /* initial state */
  76 #define SEQ_STATE_RELEASED      1
  77 #define SEQ_STATE_ACQUIRING     2
  78 #define SEQ_STATE_ACQUIRED      3
  79 #define SEQ_STATE_READ_ACQUIRED 4
  80 #define SEQ_STATE_CONTENDED     5
  81
  82 /*
  83  * MAX_LOCK_DEPTH
  84  * Imported from include/linux/sched.h.
  85  * Should this be synchronized?
  86  */
  87 #define MAX_LOCK_DEPTH 48
  88
  89 /*
  90  * struct lock_seq_stat:
  91  * Place to put on state of one lock sequence
  92  * 1) acquire -> acquired -> release
  93  * 2) acquire -> contended -> acquired -> release
  94  * 3) acquire (with read or try) -> release
  95  * 4) Are there other patterns?
  96  */
  97 struct lock_seq_stat {
  98         struct list_head        list;
  99         int                     state;
 100         u64                     prev_event_time;
 101         void                    *addr;
 102
 103         int                     read_count;
 104 };
 105
 106 struct thread_stat {
 107         struct rb_node          rb;
 108
 109         u32                     tid;
 110         struct list_head        seq_list;
 111 };
 112
 113 static struct rb_root           thread_stats;
 114
 115 static struct thread_stat *thread_stat_find(u32 tid)
 116 {
 117         struct rb_node *node;
 118         struct thread_stat *st;
 119
 120         node = thread_stats.rb_node;
 121         while (node) {
 122                 st = container_of(node, struct thread_stat, rb);
 123                 if (st->tid == tid)
 124                         return st;
 125                 else if (tid < st->tid)
 126                         node = node->rb_left;
 127                 else
 128                         node = node->rb_right;
 129         }
 130
 131         return NULL;
 132 }
 133
 134 static void thread_stat_insert(struct thread_stat *new)
 135 {
 136         struct rb_node **rb = &thread_stats.rb_node;
 137         struct rb_node *parent = NULL;
 138         struct thread_stat *p;
 139
 140         while (*rb) {
 141                 p = container_of(*rb, struct thread_stat, rb);
 142                 parent = *rb;
 143
 144                 if (new->tid < p->tid)
 145                         rb = &(*rb)->rb_left;
 146                 else if (new->tid > p->tid)
 147                         rb = &(*rb)->rb_right;
 148                 else
 149                         BUG_ON("inserting invalid thread_stat\n");
 150         }
 151
 152         rb_link_node(&new->rb, parent, rb);
 153         rb_insert_color(&new->rb, &thread_stats);
 154 }
 155
 156 static struct thread_stat *thread_stat_findnew_after_first(u32 tid)
 157 {
 158         struct thread_stat *st;
 159
 160         st = thread_stat_find(tid);
 161         if (st)
 162                 return st;
 163
 164         st = zalloc(sizeof(struct thread_stat));
 165         if (!st) {
 166                 pr_err("memory allocation failed\n");
 167                 return NULL;
 168         }
 169
 170         st->tid = tid;
 171         INIT_LIST_HEAD(&st->seq_list);
 172
 173         thread_stat_insert(st);
 174
 175         return st;
 176 }
 177
 178 static struct thread_stat *thread_stat_findnew_first(u32 tid);
 179 static struct thread_stat *(*thread_stat_findnew)(u32 tid) =
 180         thread_stat_findnew_first;
 181
 182 static struct thread_stat *thread_stat_findnew_first(u32 tid)
 183 {
 184         struct thread_stat *st;
 185
 186         st = zalloc(sizeof(struct thread_stat));
 187         if (!st) {
 188                 pr_err("memory allocation failed\n");
 189                 return NULL;
 190         }
 191         st->tid = tid;
 192         INIT_LIST_HEAD(&st->seq_list);
 193
 194         rb_link_node(&st->rb, NULL, &thread_stats.rb_node);
 195         rb_insert_color(&st->rb, &thread_stats);
 196
 197         thread_stat_findnew = thread_stat_findnew_after_first;
 198         return st;
 199 }
 200
 201 /* build simple key function one is bigger than two */
 202 #define SINGLE_KEY(member)                                              \
 203         static int lock_stat_key_ ## member(struct lock_stat *one,      \
 204                                          struct lock_stat *two)         \
 205         {                                                               \
 206                 return one->member > two->member;                       \
 207         }
 208
 209 SINGLE_KEY(nr_acquired)
 210 SINGLE_KEY(nr_contended)
 211 SINGLE_KEY(wait_time_total)
 212 SINGLE_KEY(wait_time_max)
 213
 214 static int lock_stat_key_wait_time_min(struct lock_stat *one,
 215                                         struct lock_stat *two)
 216 {
 217         u64 s1 = one->wait_time_min;
 218         u64 s2 = two->wait_time_min;
 219         if (s1 == ULLONG_MAX)
 220                 s1 = 0;
 221         if (s2 == ULLONG_MAX)
 222                 s2 = 0;
 223         return s1 > s2;
 224 }
 225
 226 struct lock_key {
 227         /*
 228          * name: the value for specify by user
 229          * this should be simpler than raw name of member
 230          * e.g. nr_acquired -> acquired, wait_time_total -> wait_total
 231          */
 232         const char              *name;
 233         int                     (*key)(struct lock_stat*, struct lock_stat*);
 234 };
 235
 236 static const char               *sort_key = "acquired";
 237
 238 static int                      (*compare)(struct lock_stat *, struct lock_stat *);
 239
 240 static struct rb_root           result; /* place to store sorted data */
 241
 242 #define DEF_KEY_LOCK(name, fn_suffix)   \
 243         { #name, lock_stat_key_ ## fn_suffix }
 244 struct lock_key keys[] = {
 245         DEF_KEY_LOCK(acquired, nr_acquired),
 246         DEF_KEY_LOCK(contended, nr_contended),
 247         DEF_KEY_LOCK(wait_total, wait_time_total),
 248         DEF_KEY_LOCK(wait_min, wait_time_min),
 249         DEF_KEY_LOCK(wait_max, wait_time_max),
 250
 251         /* extra comparisons much complicated should be here */
 252
 253         { NULL, NULL }
 254 };
 255
 256 static int select_key(void)
 257 {
 258         int i;
 259
 260         for (i = 0; keys[i].name; i++) {
 261                 if (!strcmp(keys[i].name, sort_key)) {
 262                         compare = keys[i].key;
 263                         return 0;
 264                 }
 265         }
 266
 267         pr_err("Unknown compare key: %s\n", sort_key);
 268
 269         return -1;
 270 }
 271
 272 static void insert_to_result(struct lock_stat *st,
 273                              int (*bigger)(struct lock_stat *, struct lock_stat *))
 274 {
 275         struct rb_node **rb = &result.rb_node;
 276         struct rb_node *parent = NULL;
 277         struct lock_stat *p;
 278
 279         while (*rb) {
 280                 p = container_of(*rb, struct lock_stat, rb);
 281                 parent = *rb;
 282
 283                 if (bigger(st, p))
 284                         rb = &(*rb)->rb_left;
 285                 else
 286                         rb = &(*rb)->rb_right;
 287         }
 288
 289         rb_link_node(&st->rb, parent, rb);
 290         rb_insert_color(&st->rb, &result);
 291 }
 292
 293 /* returns left most element of result, and erase it */
 294 static struct lock_stat *pop_from_result(void)
 295 {
 296         struct rb_node *node = result.rb_node;
 297
 298         if (!node)
 299                 return NULL;
 300
 301         while (node->rb_left)
 302                 node = node->rb_left;
 303
 304         rb_erase(node, &result);
 305         return container_of(node, struct lock_stat, rb);
 306 }
 307
 308 static struct lock_stat *lock_stat_findnew(void *addr, const char *name)
 309 {
 310         struct list_head *entry = lockhashentry(addr);
 311         struct lock_stat *ret, *new;
 312
 313         list_for_each_entry(ret, entry, hash_entry) {
 314                 if (ret->addr == addr)
 315                         return ret;
 316         }
 317
 318         new = zalloc(sizeof(struct lock_stat));
 319         if (!new)
 320                 goto alloc_failed;
 321
 322         new->addr = addr;
 323         new->name = zalloc(sizeof(char) * strlen(name) + 1);
 324         if (!new->name)
 325                 goto alloc_failed;
 326         strcpy(new->name, name);
 327
 328         new->wait_time_min = ULLONG_MAX;
 329
 330         list_add(&new->hash_entry, entry);
 331         return new;
 332
 333 alloc_failed:
 334         pr_err("memory allocation failed\n");
 335         return NULL;
 336 }
 337
 338 struct trace_lock_handler {
 339         int (*acquire_event)(struct perf_evsel *evsel,
 340                              struct perf_sample *sample);
 341
 342         int (*acquired_event)(struct perf_evsel *evsel,
 343                               struct perf_sample *sample);
 344
 345         int (*contended_event)(struct perf_evsel *evsel,
 346                                struct perf_sample *sample);
 347
 348         int (*release_event)(struct perf_evsel *evsel,
 349                              struct perf_sample *sample);
 350 };
 351
 352 static struct lock_seq_stat *get_seq(struct thread_stat *ts, void *addr)
 353 {
 354         struct lock_seq_stat *seq;
 355
 356         list_for_each_entry(seq, &ts->seq_list, list) {
 357                 if (seq->addr == addr)
 358                         return seq;
 359         }
 360
 361         seq = zalloc(sizeof(struct lock_seq_stat));
 362         if (!seq) {
 363                 pr_err("memory allocation failed\n");
 364                 return NULL;
 365         }
 366         seq->state = SEQ_STATE_UNINITIALIZED;
 367         seq->addr = addr;
 368
 369         list_add(&seq->list, &ts->seq_list);
 370         return seq;
 371 }
 372
 373 enum broken_state {
 374         BROKEN_ACQUIRE,
 375         BROKEN_ACQUIRED,
 376         BROKEN_CONTENDED,
 377         BROKEN_RELEASE,
 378         BROKEN_MAX,
 379 };
 380
 381 static int bad_hist[BROKEN_MAX];
 382
 383 enum acquire_flags {
 384         TRY_LOCK = 1,
 385         READ_LOCK = 2,
 386 };
 387
 388 static int report_lock_acquire_event(struct perf_evsel *evsel,
 389                                      struct perf_sample *sample)
 390 {
 391         void *addr;
 392         struct lock_stat *ls;
 393         struct thread_stat *ts;
 394         struct lock_seq_stat *seq;
 395         const char *name = perf_evsel__strval(evsel, sample, "name");
 396         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 397         int flag = perf_evsel__intval(evsel, sample, "flag");
 398
 399         memcpy(&addr, &tmp, sizeof(void *));
 400
 401         ls = lock_stat_findnew(addr, name);
 402         if (!ls)
 403                 return -1;
 404         if (ls->discard)
 405                 return 0;
 406
 407         ts = thread_stat_findnew(sample->tid);
 408         if (!ts)
 409                 return -1;
 410
 411         seq = get_seq(ts, addr);
 412         if (!seq)
 413                 return -1;
 414
 415         switch (seq->state) {
 416         case SEQ_STATE_UNINITIALIZED:
 417         case SEQ_STATE_RELEASED:
 418                 if (!flag) {
 419                         seq->state = SEQ_STATE_ACQUIRING;
 420                 } else {
 421                         if (flag & TRY_LOCK)
 422                                 ls->nr_trylock++;
 423                         if (flag & READ_LOCK)
 424                                 ls->nr_readlock++;
 425                         seq->state = SEQ_STATE_READ_ACQUIRED;
 426                         seq->read_count = 1;
 427                         ls->nr_acquired++;
 428                 }
 429                 break;
 430         case SEQ_STATE_READ_ACQUIRED:
 431                 if (flag & READ_LOCK) {
 432                         seq->read_count++;
 433                         ls->nr_acquired++;
 434                         goto end;
 435                 } else {
 436                         goto broken;
 437                 }
 438                 break;
 439         case SEQ_STATE_ACQUIRED:
 440         case SEQ_STATE_ACQUIRING:
 441         case SEQ_STATE_CONTENDED:
 442 broken:
 443                 /* broken lock sequence, discard it */
 444                 ls->discard = 1;
 445                 bad_hist[BROKEN_ACQUIRE]++;
 446                 list_del(&seq->list);
 447                 free(seq);
 448                 goto end;
 449         default:
 450                 BUG_ON("Unknown state of lock sequence found!\n");
 451                 break;
 452         }
 453
 454         ls->nr_acquire++;
 455         seq->prev_event_time = sample->time;
 456 end:
 457         return 0;
 458 }
 459
 460 static int report_lock_acquired_event(struct perf_evsel *evsel,
 461                                       struct perf_sample *sample)
 462 {
 463         void *addr;
 464         struct lock_stat *ls;
 465         struct thread_stat *ts;
 466         struct lock_seq_stat *seq;
 467         u64 contended_term;
 468         const char *name = perf_evsel__strval(evsel, sample, "name");
 469         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 470
 471         memcpy(&addr, &tmp, sizeof(void *));
 472
 473         ls = lock_stat_findnew(addr, name);
 474         if (!ls)
 475                 return -1;
 476         if (ls->discard)
 477                 return 0;
 478
 479         ts = thread_stat_findnew(sample->tid);
 480         if (!ts)
 481                 return -1;
 482
 483         seq = get_seq(ts, addr);
 484         if (!seq)
 485                 return -1;
 486
 487         switch (seq->state) {
 488         case SEQ_STATE_UNINITIALIZED:
 489                 /* orphan event, do nothing */
 490                 return 0;
 491         case SEQ_STATE_ACQUIRING:
 492                 break;
 493         case SEQ_STATE_CONTENDED:
 494                 contended_term = sample->time - seq->prev_event_time;
 495                 ls->wait_time_total += contended_term;
 496                 if (contended_term < ls->wait_time_min)
 497                         ls->wait_time_min = contended_term;
 498                 if (ls->wait_time_max < contended_term)
 499                         ls->wait_time_max = contended_term;
 500                 break;
 501         case SEQ_STATE_RELEASED:
 502         case SEQ_STATE_ACQUIRED:
 503         case SEQ_STATE_READ_ACQUIRED:
 504                 /* broken lock sequence, discard it */
 505                 ls->discard = 1;
 506                 bad_hist[BROKEN_ACQUIRED]++;
 507                 list_del(&seq->list);
 508                 free(seq);
 509                 goto end;
 510         default:
 511                 BUG_ON("Unknown state of lock sequence found!\n");
 512                 break;
 513         }
 514
 515         seq->state = SEQ_STATE_ACQUIRED;
 516         ls->nr_acquired++;
 517         seq->prev_event_time = sample->time;
 518 end:
 519         return 0;
 520 }
 521
 522 static int report_lock_contended_event(struct perf_evsel *evsel,
 523                                        struct perf_sample *sample)
 524 {
 525         void *addr;
 526         struct lock_stat *ls;
 527         struct thread_stat *ts;
 528         struct lock_seq_stat *seq;
 529         const char *name = perf_evsel__strval(evsel, sample, "name");
 530         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 531
 532         memcpy(&addr, &tmp, sizeof(void *));
 533
 534         ls = lock_stat_findnew(addr, name);
 535         if (!ls)
 536                 return -1;
 537         if (ls->discard)
 538                 return 0;
 539
 540         ts = thread_stat_findnew(sample->tid);
 541         if (!ts)
 542                 return -1;
 543
 544         seq = get_seq(ts, addr);
 545         if (!seq)
 546                 return -1;
 547
 548         switch (seq->state) {
 549         case SEQ_STATE_UNINITIALIZED:
 550                 /* orphan event, do nothing */
 551                 return 0;
 552         case SEQ_STATE_ACQUIRING:
 553                 break;
 554         case SEQ_STATE_RELEASED:
 555         case SEQ_STATE_ACQUIRED:
 556         case SEQ_STATE_READ_ACQUIRED:
 557         case SEQ_STATE_CONTENDED:
 558                 /* broken lock sequence, discard it */
 559                 ls->discard = 1;
 560                 bad_hist[BROKEN_CONTENDED]++;
 561                 list_del(&seq->list);
 562                 free(seq);
 563                 goto end;
 564         default:
 565                 BUG_ON("Unknown state of lock sequence found!\n");
 566                 break;
 567         }
 568
 569         seq->state = SEQ_STATE_CONTENDED;
 570         ls->nr_contended++;
 571         seq->prev_event_time = sample->time;
 572 end:
 573         return 0;
 574 }
 575
 576 static int report_lock_release_event(struct perf_evsel *evsel,
 577                                      struct perf_sample *sample)
 578 {
 579         void *addr;
 580         struct lock_stat *ls;
 581         struct thread_stat *ts;
 582         struct lock_seq_stat *seq;
 583         const char *name = perf_evsel__strval(evsel, sample, "name");
 584         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 585
 586         memcpy(&addr, &tmp, sizeof(void *));
 587
 588         ls = lock_stat_findnew(addr, name);
 589         if (!ls)
 590                 return -1;
 591         if (ls->discard)
 592                 return 0;
 593
 594         ts = thread_stat_findnew(sample->tid);
 595         if (!ts)
 596                 return -1;
 597
 598         seq = get_seq(ts, addr);
 599         if (!seq)
 600                 return -1;
 601
 602         switch (seq->state) {
 603         case SEQ_STATE_UNINITIALIZED:
 604                 goto end;
 605         case SEQ_STATE_ACQUIRED:
 606                 break;
 607         case SEQ_STATE_READ_ACQUIRED:
 608                 seq->read_count--;
 609                 BUG_ON(seq->read_count < 0);
 610                 if (!seq->read_count) {
 611                         ls->nr_release++;
 612                         goto end;
 613                 }
 614                 break;
 615         case SEQ_STATE_ACQUIRING:
 616         case SEQ_STATE_CONTENDED:
 617         case SEQ_STATE_RELEASED:
 618                 /* broken lock sequence, discard it */
 619                 ls->discard = 1;
 620                 bad_hist[BROKEN_RELEASE]++;
 621                 goto free_seq;
 622         default:
 623                 BUG_ON("Unknown state of lock sequence found!\n");
 624                 break;
 625         }
 626
 627         ls->nr_release++;
 628 free_seq:
 629         list_del(&seq->list);
 630         free(seq);
 631 end:
 632         return 0;
 633 }
 634
 635 /* lock oriented handlers */
 636 /* TODO: handlers for CPU oriented, thread oriented */
 637 static struct trace_lock_handler report_lock_ops  = {
 638         .acquire_event          = report_lock_acquire_event,
 639         .acquired_event         = report_lock_acquired_event,
 640         .contended_event        = report_lock_contended_event,
 641         .release_event          = report_lock_release_event,
 642 };
 643
 644 static struct trace_lock_handler *trace_handler;
 645
 646 static int perf_evsel__process_lock_acquire(struct perf_evsel *evsel,
 647                                              struct perf_sample *sample)
 648 {
 649         if (trace_handler->acquire_event)
 650                 return trace_handler->acquire_event(evsel, sample);
 651         return 0;
 652 }
 653
 654 static int perf_evsel__process_lock_acquired(struct perf_evsel *evsel,
 655                                               struct perf_sample *sample)
 656 {
 657         if (trace_handler->acquired_event)
 658                 return trace_handler->acquired_event(evsel, sample);
 659         return 0;
 660 }
 661
 662 static int perf_evsel__process_lock_contended(struct perf_evsel *evsel,
 663                                               struct perf_sample *sample)
 664 {
 665         if (trace_handler->contended_event)
 666                 return trace_handler->contended_event(evsel, sample);
 667         return 0;
 668 }
 669
 670 static int perf_evsel__process_lock_release(struct perf_evsel *evsel,
 671                                             struct perf_sample *sample)
 672 {
 673         if (trace_handler->release_event)
 674                 return trace_handler->release_event(evsel, sample);
 675         return 0;
 676 }
 677
 678 static void print_bad_events(int bad, int total)
 679 {
 680         /* Output for debug, this have to be removed */
 681         int i;
 682         const char *name[4] =
 683                 { "acquire", "acquired", "contended", "release" };
 684
 685         pr_info("\n=== output for debug===\n\n");
 686         pr_info("bad: %d, total: %d\n", bad, total);
 687         pr_info("bad rate: %f %%\n", (double)bad / (double)total * 100);
 688         pr_info("histogram of events caused bad sequence\n");
 689         for (i = 0; i < BROKEN_MAX; i++)
 690                 pr_info(" %10s: %d\n", name[i], bad_hist[i]);
 691 }
 692
 693 /* TODO: various way to print, coloring, nano or milli sec */
 694 static void print_result(void)
 695 {
 696         struct lock_stat *st;
 697         char cut_name[20];
 698         int bad, total;
 699
 700         pr_info("%20s ", "Name");
 701         pr_info("%10s ", "acquired");
 702         pr_info("%10s ", "contended");
 703
 704         pr_info("%15s ", "total wait (ns)");
 705         pr_info("%15s ", "max wait (ns)");
 706         pr_info("%15s ", "min wait (ns)");
 707
 708         pr_info("\n\n");
 709
 710         bad = total = 0;
 711         while ((st = pop_from_result())) {
 712                 total++;
 713                 if (st->discard) {
 714                         bad++;
 715                         continue;
 716                 }
 717                 bzero(cut_name, 20);
 718
 719                 if (strlen(st->name) < 16) {
 720                         /* output raw name */
 721                         pr_info("%20s ", st->name);
 722                 } else {
 723                         strncpy(cut_name, st->name, 16);
 724                         cut_name[16] = '.';
 725                         cut_name[17] = '.';
 726                         cut_name[18] = '.';
 727                         cut_name[19] = '\0';
 728                         /* cut off name for saving output style */
 729                         pr_info("%20s ", cut_name);
 730                 }
 731
 732                 pr_info("%10u ", st->nr_acquired);
 733                 pr_info("%10u ", st->nr_contended);
 734
 735                 pr_info("%15" PRIu64 " ", st->wait_time_total);
 736                 pr_info("%15" PRIu64 " ", st->wait_time_max);
 737                 pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
 738                        0 : st->wait_time_min);
 739                 pr_info("\n");
 740         }
 741
 742         print_bad_events(bad, total);
 743 }
 744
 745 static bool info_threads, info_map;
 746
 747 static void dump_threads(void)
 748 {
 749         struct thread_stat *st;
 750         struct rb_node *node;
 751         struct thread *t;
 752
 753         pr_info("%10s: comm\n", "Thread ID");
 754
 755         node = rb_first(&thread_stats);
 756         while (node) {
 757                 st = container_of(node, struct thread_stat, rb);
 758                 t = perf_session__findnew(session, st->tid);
 759                 pr_info("%10d: %s\n", st->tid, t->comm);
 760                 node = rb_next(node);
 761         };
 762 }
 763
 764 static void dump_map(void)
 765 {
 766         unsigned int i;
 767         struct lock_stat *st;
 768
 769         pr_info("Address of instance: name of class\n");
 770         for (i = 0; i < LOCKHASH_SIZE; i++) {
 771                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
 772                         pr_info(" %p: %s\n", st->addr, st->name);
 773                 }
 774         }
 775 }
 776
 777 static int dump_info(void)
 778 {
 779         int rc = 0;
 780
 781         if (info_threads)
 782                 dump_threads();
 783         else if (info_map)
 784                 dump_map();
 785         else {
 786                 rc = -1;
 787                 pr_err("Unknown type of information\n");
 788         }
 789
 790         return rc;
 791 }
 792
 793 typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
 794                                   struct perf_sample *sample);
 795
 796 static int process_sample_event(struct perf_tool *tool __maybe_unused,
 797                                 union perf_event *event,
 798                                 struct perf_sample *sample,
 799                                 struct perf_evsel *evsel,
 800                                 struct machine *machine)
 801 {
 802         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 803                                                         sample->tid);
 804
 805         if (thread == NULL) {
 806                 pr_debug("problem processing %d event, skipping it.\n",
 807                         event->header.type);
 808                 return -1;
 809         }
 810
 811         if (evsel->handler.func != NULL) {
 812                 tracepoint_handler f = evsel->handler.func;
 813                 return f(evsel, sample);
 814         }
 815
 816         return 0;
 817 }
 818
 819 static const struct perf_evsel_str_handler lock_tracepoints[] = {
 820         { "lock:lock_acquire",   perf_evsel__process_lock_acquire,   }, /* CONFIG_LOCKDEP */
 821         { "lock:lock_acquired",  perf_evsel__process_lock_acquired,  }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
 822         { "lock:lock_contended", perf_evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
 823         { "lock:lock_release",   perf_evsel__process_lock_release,   }, /* CONFIG_LOCKDEP */
 824 };
 825
 826 static int read_events(void)
 827 {
 828         struct perf_tool eops = {
 829                 .sample          = process_sample_event,
 830                 .comm            = perf_event__process_comm,
 831                 .ordered_samples = true,
 832         };
 833         session = perf_session__new(input_name, O_RDONLY, 0, false, &eops);
 834         if (!session) {
 835                 pr_err("Initializing perf session failed\n");
 836                 return -1;
 837         }
 838
 839         if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
 840                 pr_err("Initializing perf session tracepoint handlers failed\n");
 841                 return -1;
 842         }
 843
 844         return perf_session__process_events(session, &eops);
 845 }
 846
 847 static void sort_result(void)
 848 {
 849         unsigned int i;
 850         struct lock_stat *st;
 851
 852         for (i = 0; i < LOCKHASH_SIZE; i++) {
 853                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
 854                         insert_to_result(st, compare);
 855                 }
 856         }
 857 }
 858
 859 static int __cmd_report(void)
 860 {
 861         setup_pager();
 862
 863         if ((select_key() != 0) ||
 864             (read_events() != 0))
 865                 return -1;
 866
 867         sort_result();
 868         print_result();
 869
 870         return 0;
 871 }
 872
 873 static int __cmd_record(int argc, const char **argv)
 874 {
 875         const char *record_args[] = {
 876                 "record", "-R", "-m", "1024", "-c", "1",
 877         };
 878         unsigned int rec_argc, i, j;
 879         const char **rec_argv;
 880
 881         for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
 882                 if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
 883                                 pr_err("tracepoint %s is not enabled. "
 884                                        "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
 885                                        lock_tracepoints[i].name);
 886                                 return 1;
 887                 }
 888         }
 889
 890         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
 891         /* factor of 2 is for -e in front of each tracepoint */
 892         rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
 893
 894         rec_argv = calloc(rec_argc + 1, sizeof(char *));
 895         if (rec_argv == NULL)
 896                 return -ENOMEM;
 897
 898         for (i = 0; i < ARRAY_SIZE(record_args); i++)
 899                 rec_argv[i] = strdup(record_args[i]);
 900
 901         for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
 902                 rec_argv[i++] = "-e";
 903                 rec_argv[i++] = strdup(lock_tracepoints[j].name);
 904         }
 905
 906         for (j = 1; j < (unsigned int)argc; j++, i++)
 907                 rec_argv[i] = argv[j];
 908
 909         BUG_ON(i != rec_argc);
 910
 911         return cmd_record(i, rec_argv, NULL);
 912 }
 913
 914 int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 915 {
 916         const struct option info_options[] = {
 917         OPT_BOOLEAN('t', "threads", &info_threads,
 918                     "dump thread list in perf.data"),
 919         OPT_BOOLEAN('m', "map", &info_map,
 920                     "map of lock instances (address:name table)"),
 921         OPT_END()
 922         };
 923         const struct option lock_options[] = {
 924         OPT_STRING('i', "input", &input_name, "file", "input file name"),
 925         OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
 926         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
 927         OPT_END()
 928         };
 929         const struct option report_options[] = {
 930         OPT_STRING('k', "key", &sort_key, "acquired",
 931                     "key for sorting (acquired / contended / wait_total / wait_max / wait_min)"),
 932         /* TODO: type */
 933         OPT_END()
 934         };
 935         const char * const info_usage[] = {
 936                 "perf lock info [<options>]",
 937                 NULL
 938         };
 939         const char * const lock_usage[] = {
 940                 "perf lock [<options>] {record|report|script|info}",
 941                 NULL
 942         };
 943         const char * const report_usage[] = {
 944                 "perf lock report [<options>]",
 945                 NULL
 946         };
 947         unsigned int i;
 948         int rc = 0;
 949
 950         symbol__init();
 951         for (i = 0; i < LOCKHASH_SIZE; i++)
 952                 INIT_LIST_HEAD(lockhash_table + i);
 953
 954         argc = parse_options(argc, argv, lock_options, lock_usage,
 955                              PARSE_OPT_STOP_AT_NON_OPTION);
 956         if (!argc)
 957                 usage_with_options(lock_usage, lock_options);
 958
 959         if (!strncmp(argv[0], "rec", 3)) {
 960                 return __cmd_record(argc, argv);
 961         } else if (!strncmp(argv[0], "report", 6)) {
 962                 trace_handler = &report_lock_ops;
 963                 if (argc) {
 964                         argc = parse_options(argc, argv,
 965                                              report_options, report_usage, 0);
 966                         if (argc)
 967                                 usage_with_options(report_usage, report_options);
 968                 }
 969                 __cmd_report();
 970         } else if (!strcmp(argv[0], "script")) {
 971                 /* Aliased to 'perf script' */
 972                 return cmd_script(argc, argv, prefix);
 973         } else if (!strcmp(argv[0], "info")) {
 974                 if (argc) {
 975                         argc = parse_options(argc, argv,
 976                                              info_options, info_usage, 0);
 977                         if (argc)
 978                                 usage_with_options(info_usage, info_options);
 979                 }
 980                 /* recycling report_lock_ops */
 981                 trace_handler = &report_lock_ops;
 982                 setup_pager();
 983                 if (read_events() != 0)
 984                         rc = -1;
 985                 else
 986                         rc = dump_info();
 987         } else {
 988                 usage_with_options(lock_usage, lock_options);
 989         }
 990
 991         return rc;
 992 }