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                 break;
 450         default:
 451                 BUG_ON("Unknown state of lock sequence found!\n");
 452                 break;
 453         }
 454
 455         ls->nr_acquire++;
 456         seq->prev_event_time = sample->time;
 457 end:
 458         return 0;
 459 }
 460
 461 static int report_lock_acquired_event(struct perf_evsel *evsel,
 462                                       struct perf_sample *sample)
 463 {
 464         void *addr;
 465         struct lock_stat *ls;
 466         struct thread_stat *ts;
 467         struct lock_seq_stat *seq;
 468         u64 contended_term;
 469         const char *name = perf_evsel__strval(evsel, sample, "name");
 470         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 471
 472         memcpy(&addr, &tmp, sizeof(void *));
 473
 474         ls = lock_stat_findnew(addr, name);
 475         if (!ls)
 476                 return -1;
 477         if (ls->discard)
 478                 return 0;
 479
 480         ts = thread_stat_findnew(sample->tid);
 481         if (!ts)
 482                 return -1;
 483
 484         seq = get_seq(ts, addr);
 485         if (!seq)
 486                 return -1;
 487
 488         switch (seq->state) {
 489         case SEQ_STATE_UNINITIALIZED:
 490                 /* orphan event, do nothing */
 491                 return 0;
 492         case SEQ_STATE_ACQUIRING:
 493                 break;
 494         case SEQ_STATE_CONTENDED:
 495                 contended_term = sample->time - seq->prev_event_time;
 496                 ls->wait_time_total += contended_term;
 497                 if (contended_term < ls->wait_time_min)
 498                         ls->wait_time_min = contended_term;
 499                 if (ls->wait_time_max < contended_term)
 500                         ls->wait_time_max = contended_term;
 501                 break;
 502         case SEQ_STATE_RELEASED:
 503         case SEQ_STATE_ACQUIRED:
 504         case SEQ_STATE_READ_ACQUIRED:
 505                 /* broken lock sequence, discard it */
 506                 ls->discard = 1;
 507                 bad_hist[BROKEN_ACQUIRED]++;
 508                 list_del(&seq->list);
 509                 free(seq);
 510                 goto end;
 511                 break;
 512
 513         default:
 514                 BUG_ON("Unknown state of lock sequence found!\n");
 515                 break;
 516         }
 517
 518         seq->state = SEQ_STATE_ACQUIRED;
 519         ls->nr_acquired++;
 520         seq->prev_event_time = sample->time;
 521 end:
 522         return 0;
 523 }
 524
 525 static int report_lock_contended_event(struct perf_evsel *evsel,
 526                                        struct perf_sample *sample)
 527 {
 528         void *addr;
 529         struct lock_stat *ls;
 530         struct thread_stat *ts;
 531         struct lock_seq_stat *seq;
 532         const char *name = perf_evsel__strval(evsel, sample, "name");
 533         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 534
 535         memcpy(&addr, &tmp, sizeof(void *));
 536
 537         ls = lock_stat_findnew(addr, name);
 538         if (!ls)
 539                 return -1;
 540         if (ls->discard)
 541                 return 0;
 542
 543         ts = thread_stat_findnew(sample->tid);
 544         if (!ts)
 545                 return -1;
 546
 547         seq = get_seq(ts, addr);
 548         if (!seq)
 549                 return -1;
 550
 551         switch (seq->state) {
 552         case SEQ_STATE_UNINITIALIZED:
 553                 /* orphan event, do nothing */
 554                 return 0;
 555         case SEQ_STATE_ACQUIRING:
 556                 break;
 557         case SEQ_STATE_RELEASED:
 558         case SEQ_STATE_ACQUIRED:
 559         case SEQ_STATE_READ_ACQUIRED:
 560         case SEQ_STATE_CONTENDED:
 561                 /* broken lock sequence, discard it */
 562                 ls->discard = 1;
 563                 bad_hist[BROKEN_CONTENDED]++;
 564                 list_del(&seq->list);
 565                 free(seq);
 566                 goto end;
 567                 break;
 568         default:
 569                 BUG_ON("Unknown state of lock sequence found!\n");
 570                 break;
 571         }
 572
 573         seq->state = SEQ_STATE_CONTENDED;
 574         ls->nr_contended++;
 575         seq->prev_event_time = sample->time;
 576 end:
 577         return 0;
 578 }
 579
 580 static int report_lock_release_event(struct perf_evsel *evsel,
 581                                      struct perf_sample *sample)
 582 {
 583         void *addr;
 584         struct lock_stat *ls;
 585         struct thread_stat *ts;
 586         struct lock_seq_stat *seq;
 587         const char *name = perf_evsel__strval(evsel, sample, "name");
 588         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 589
 590         memcpy(&addr, &tmp, sizeof(void *));
 591
 592         ls = lock_stat_findnew(addr, name);
 593         if (!ls)
 594                 return -1;
 595         if (ls->discard)
 596                 return 0;
 597
 598         ts = thread_stat_findnew(sample->tid);
 599         if (!ts)
 600                 return -1;
 601
 602         seq = get_seq(ts, addr);
 603         if (!seq)
 604                 return -1;
 605
 606         switch (seq->state) {
 607         case SEQ_STATE_UNINITIALIZED:
 608                 goto end;
 609                 break;
 610         case SEQ_STATE_ACQUIRED:
 611                 break;
 612         case SEQ_STATE_READ_ACQUIRED:
 613                 seq->read_count--;
 614                 BUG_ON(seq->read_count < 0);
 615                 if (!seq->read_count) {
 616                         ls->nr_release++;
 617                         goto end;
 618                 }
 619                 break;
 620         case SEQ_STATE_ACQUIRING:
 621         case SEQ_STATE_CONTENDED:
 622         case SEQ_STATE_RELEASED:
 623                 /* broken lock sequence, discard it */
 624                 ls->discard = 1;
 625                 bad_hist[BROKEN_RELEASE]++;
 626                 goto free_seq;
 627                 break;
 628         default:
 629                 BUG_ON("Unknown state of lock sequence found!\n");
 630                 break;
 631         }
 632
 633         ls->nr_release++;
 634 free_seq:
 635         list_del(&seq->list);
 636         free(seq);
 637 end:
 638         return 0;
 639 }
 640
 641 /* lock oriented handlers */
 642 /* TODO: handlers for CPU oriented, thread oriented */
 643 static struct trace_lock_handler report_lock_ops  = {
 644         .acquire_event          = report_lock_acquire_event,
 645         .acquired_event         = report_lock_acquired_event,
 646         .contended_event        = report_lock_contended_event,
 647         .release_event          = report_lock_release_event,
 648 };
 649
 650 static struct trace_lock_handler *trace_handler;
 651
 652 static int perf_evsel__process_lock_acquire(struct perf_evsel *evsel,
 653                                              struct perf_sample *sample)
 654 {
 655         if (trace_handler->acquire_event)
 656                 return trace_handler->acquire_event(evsel, sample);
 657         return 0;
 658 }
 659
 660 static int perf_evsel__process_lock_acquired(struct perf_evsel *evsel,
 661                                               struct perf_sample *sample)
 662 {
 663         if (trace_handler->acquired_event)
 664                 return trace_handler->acquired_event(evsel, sample);
 665         return 0;
 666 }
 667
 668 static int perf_evsel__process_lock_contended(struct perf_evsel *evsel,
 669                                               struct perf_sample *sample)
 670 {
 671         if (trace_handler->contended_event)
 672                 return trace_handler->contended_event(evsel, sample);
 673         return 0;
 674 }
 675
 676 static int perf_evsel__process_lock_release(struct perf_evsel *evsel,
 677                                             struct perf_sample *sample)
 678 {
 679         if (trace_handler->release_event)
 680                 return trace_handler->release_event(evsel, sample);
 681         return 0;
 682 }
 683
 684 static void print_bad_events(int bad, int total)
 685 {
 686         /* Output for debug, this have to be removed */
 687         int i;
 688         const char *name[4] =
 689                 { "acquire", "acquired", "contended", "release" };
 690
 691         pr_info("\n=== output for debug===\n\n");
 692         pr_info("bad: %d, total: %d\n", bad, total);
 693         pr_info("bad rate: %f %%\n", (double)bad / (double)total * 100);
 694         pr_info("histogram of events caused bad sequence\n");
 695         for (i = 0; i < BROKEN_MAX; i++)
 696                 pr_info(" %10s: %d\n", name[i], bad_hist[i]);
 697 }
 698
 699 /* TODO: various way to print, coloring, nano or milli sec */
 700 static void print_result(void)
 701 {
 702         struct lock_stat *st;
 703         char cut_name[20];
 704         int bad, total;
 705
 706         pr_info("%20s ", "Name");
 707         pr_info("%10s ", "acquired");
 708         pr_info("%10s ", "contended");
 709
 710         pr_info("%15s ", "total wait (ns)");
 711         pr_info("%15s ", "max wait (ns)");
 712         pr_info("%15s ", "min wait (ns)");
 713
 714         pr_info("\n\n");
 715
 716         bad = total = 0;
 717         while ((st = pop_from_result())) {
 718                 total++;
 719                 if (st->discard) {
 720                         bad++;
 721                         continue;
 722                 }
 723                 bzero(cut_name, 20);
 724
 725                 if (strlen(st->name) < 16) {
 726                         /* output raw name */
 727                         pr_info("%20s ", st->name);
 728                 } else {
 729                         strncpy(cut_name, st->name, 16);
 730                         cut_name[16] = '.';
 731                         cut_name[17] = '.';
 732                         cut_name[18] = '.';
 733                         cut_name[19] = '\0';
 734                         /* cut off name for saving output style */
 735                         pr_info("%20s ", cut_name);
 736                 }
 737
 738                 pr_info("%10u ", st->nr_acquired);
 739                 pr_info("%10u ", st->nr_contended);
 740
 741                 pr_info("%15" PRIu64 " ", st->wait_time_total);
 742                 pr_info("%15" PRIu64 " ", st->wait_time_max);
 743                 pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
 744                        0 : st->wait_time_min);
 745                 pr_info("\n");
 746         }
 747
 748         print_bad_events(bad, total);
 749 }
 750
 751 static bool info_threads, info_map;
 752
 753 static void dump_threads(void)
 754 {
 755         struct thread_stat *st;
 756         struct rb_node *node;
 757         struct thread *t;
 758
 759         pr_info("%10s: comm\n", "Thread ID");
 760
 761         node = rb_first(&thread_stats);
 762         while (node) {
 763                 st = container_of(node, struct thread_stat, rb);
 764                 t = perf_session__findnew(session, st->tid);
 765                 pr_info("%10d: %s\n", st->tid, t->comm);
 766                 node = rb_next(node);
 767         };
 768 }
 769
 770 static void dump_map(void)
 771 {
 772         unsigned int i;
 773         struct lock_stat *st;
 774
 775         pr_info("Address of instance: name of class\n");
 776         for (i = 0; i < LOCKHASH_SIZE; i++) {
 777                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
 778                         pr_info(" %p: %s\n", st->addr, st->name);
 779                 }
 780         }
 781 }
 782
 783 static int dump_info(void)
 784 {
 785         int rc = 0;
 786
 787         if (info_threads)
 788                 dump_threads();
 789         else if (info_map)
 790                 dump_map();
 791         else {
 792                 rc = -1;
 793                 pr_err("Unknown type of information\n");
 794         }
 795
 796         return rc;
 797 }
 798
 799 typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
 800                                   struct perf_sample *sample);
 801
 802 static int process_sample_event(struct perf_tool *tool __maybe_unused,
 803                                 union perf_event *event,
 804                                 struct perf_sample *sample,
 805                                 struct perf_evsel *evsel,
 806                                 struct machine *machine)
 807 {
 808         struct thread *thread = machine__findnew_thread(machine, sample->tid);
 809
 810         if (thread == NULL) {
 811                 pr_debug("problem processing %d event, skipping it.\n",
 812                         event->header.type);
 813                 return -1;
 814         }
 815
 816         if (evsel->handler.func != NULL) {
 817                 tracepoint_handler f = evsel->handler.func;
 818                 return f(evsel, sample);
 819         }
 820
 821         return 0;
 822 }
 823
 824 static const struct perf_evsel_str_handler lock_tracepoints[] = {
 825         { "lock:lock_acquire",   perf_evsel__process_lock_acquire,   }, /* CONFIG_LOCKDEP */
 826         { "lock:lock_acquired",  perf_evsel__process_lock_acquired,  }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
 827         { "lock:lock_contended", perf_evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
 828         { "lock:lock_release",   perf_evsel__process_lock_release,   }, /* CONFIG_LOCKDEP */
 829 };
 830
 831 static int read_events(void)
 832 {
 833         struct perf_tool eops = {
 834                 .sample          = process_sample_event,
 835                 .comm            = perf_event__process_comm,
 836                 .ordered_samples = true,
 837         };
 838         session = perf_session__new(input_name, O_RDONLY, 0, false, &eops);
 839         if (!session) {
 840                 pr_err("Initializing perf session failed\n");
 841                 return -1;
 842         }
 843
 844         if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
 845                 pr_err("Initializing perf session tracepoint handlers failed\n");
 846                 return -1;
 847         }
 848
 849         return perf_session__process_events(session, &eops);
 850 }
 851
 852 static void sort_result(void)
 853 {
 854         unsigned int i;
 855         struct lock_stat *st;
 856
 857         for (i = 0; i < LOCKHASH_SIZE; i++) {
 858                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
 859                         insert_to_result(st, compare);
 860                 }
 861         }
 862 }
 863
 864 static int __cmd_report(void)
 865 {
 866         setup_pager();
 867
 868         if ((select_key() != 0) ||
 869             (read_events() != 0))
 870                 return -1;
 871
 872         sort_result();
 873         print_result();
 874
 875         return 0;
 876 }
 877
 878 static int __cmd_record(int argc, const char **argv)
 879 {
 880         const char *record_args[] = {
 881                 "record", "-R", "-f", "-m", "1024", "-c", "1",
 882         };
 883         unsigned int rec_argc, i, j;
 884         const char **rec_argv;
 885
 886         for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
 887                 if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
 888                                 pr_err("tracepoint %s is not enabled. "
 889                                        "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
 890                                        lock_tracepoints[i].name);
 891                                 return 1;
 892                 }
 893         }
 894
 895         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
 896         /* factor of 2 is for -e in front of each tracepoint */
 897         rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
 898
 899         rec_argv = calloc(rec_argc + 1, sizeof(char *));
 900         if (rec_argv == NULL)
 901                 return -ENOMEM;
 902
 903         for (i = 0; i < ARRAY_SIZE(record_args); i++)
 904                 rec_argv[i] = strdup(record_args[i]);
 905
 906         for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
 907                 rec_argv[i++] = "-e";
 908                 rec_argv[i++] = strdup(lock_tracepoints[j].name);
 909         }
 910
 911         for (j = 1; j < (unsigned int)argc; j++, i++)
 912                 rec_argv[i] = argv[j];
 913
 914         BUG_ON(i != rec_argc);
 915
 916         return cmd_record(i, rec_argv, NULL);
 917 }
 918
 919 int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 920 {
 921         const struct option info_options[] = {
 922         OPT_BOOLEAN('t', "threads", &info_threads,
 923                     "dump thread list in perf.data"),
 924         OPT_BOOLEAN('m', "map", &info_map,
 925                     "map of lock instances (address:name table)"),
 926         OPT_END()
 927         };
 928         const struct option lock_options[] = {
 929         OPT_STRING('i', "input", &input_name, "file", "input file name"),
 930         OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
 931         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
 932         OPT_END()
 933         };
 934         const struct option report_options[] = {
 935         OPT_STRING('k', "key", &sort_key, "acquired",
 936                     "key for sorting (acquired / contended / wait_total / wait_max / wait_min)"),
 937         /* TODO: type */
 938         OPT_END()
 939         };
 940         const char * const info_usage[] = {
 941                 "perf lock info [<options>]",
 942                 NULL
 943         };
 944         const char * const lock_usage[] = {
 945                 "perf lock [<options>] {record|report|script|info}",
 946                 NULL
 947         };
 948         const char * const report_usage[] = {
 949                 "perf lock report [<options>]",
 950                 NULL
 951         };
 952         unsigned int i;
 953         int rc = 0;
 954
 955         symbol__init();
 956         for (i = 0; i < LOCKHASH_SIZE; i++)
 957                 INIT_LIST_HEAD(lockhash_table + i);
 958
 959         argc = parse_options(argc, argv, lock_options, lock_usage,
 960                              PARSE_OPT_STOP_AT_NON_OPTION);
 961         if (!argc)
 962                 usage_with_options(lock_usage, lock_options);
 963
 964         if (!strncmp(argv[0], "rec", 3)) {
 965                 return __cmd_record(argc, argv);
 966         } else if (!strncmp(argv[0], "report", 6)) {
 967                 trace_handler = &report_lock_ops;
 968                 if (argc) {
 969                         argc = parse_options(argc, argv,
 970                                              report_options, report_usage, 0);
 971                         if (argc)
 972                                 usage_with_options(report_usage, report_options);
 973                 }
 974                 __cmd_report();
 975         } else if (!strcmp(argv[0], "script")) {
 976                 /* Aliased to 'perf script' */
 977                 return cmd_script(argc, argv, prefix);
 978         } else if (!strcmp(argv[0], "info")) {
 979                 if (argc) {
 980                         argc = parse_options(argc, argv,
 981                                              info_options, info_usage, 0);
 982                         if (argc)
 983                                 usage_with_options(info_usage, info_options);
 984                 }
 985                 /* recycling report_lock_ops */
 986                 trace_handler = &report_lock_ops;
 987                 setup_pager();
 988                 if (read_events() != 0)
 989                         rc = -1;
 990                 else
 991                         rc = dump_info();
 992         } else {
 993                 usage_with_options(lock_usage, lock_options);
 994         }
 995
 996         return rc;
 997 }