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 static const char *input_name;
 339
 340 struct trace_lock_handler {
 341         int (*acquire_event)(struct perf_evsel *evsel,
 342                              struct perf_sample *sample);
 343
 344         int (*acquired_event)(struct perf_evsel *evsel,
 345                               struct perf_sample *sample);
 346
 347         int (*contended_event)(struct perf_evsel *evsel,
 348                                struct perf_sample *sample);
 349
 350         int (*release_event)(struct perf_evsel *evsel,
 351                              struct perf_sample *sample);
 352 };
 353
 354 static struct lock_seq_stat *get_seq(struct thread_stat *ts, void *addr)
 355 {
 356         struct lock_seq_stat *seq;
 357
 358         list_for_each_entry(seq, &ts->seq_list, list) {
 359                 if (seq->addr == addr)
 360                         return seq;
 361         }
 362
 363         seq = zalloc(sizeof(struct lock_seq_stat));
 364         if (!seq) {
 365                 pr_err("memory allocation failed\n");
 366                 return NULL;
 367         }
 368         seq->state = SEQ_STATE_UNINITIALIZED;
 369         seq->addr = addr;
 370
 371         list_add(&seq->list, &ts->seq_list);
 372         return seq;
 373 }
 374
 375 enum broken_state {
 376         BROKEN_ACQUIRE,
 377         BROKEN_ACQUIRED,
 378         BROKEN_CONTENDED,
 379         BROKEN_RELEASE,
 380         BROKEN_MAX,
 381 };
 382
 383 static int bad_hist[BROKEN_MAX];
 384
 385 enum acquire_flags {
 386         TRY_LOCK = 1,
 387         READ_LOCK = 2,
 388 };
 389
 390 static int report_lock_acquire_event(struct perf_evsel *evsel,
 391                                      struct perf_sample *sample)
 392 {
 393         void *addr;
 394         struct lock_stat *ls;
 395         struct thread_stat *ts;
 396         struct lock_seq_stat *seq;
 397         const char *name = perf_evsel__strval(evsel, sample, "name");
 398         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 399         int flag = perf_evsel__intval(evsel, sample, "flag");
 400
 401         memcpy(&addr, &tmp, sizeof(void *));
 402
 403         ls = lock_stat_findnew(addr, name);
 404         if (!ls)
 405                 return -1;
 406         if (ls->discard)
 407                 return 0;
 408
 409         ts = thread_stat_findnew(sample->tid);
 410         if (!ts)
 411                 return -1;
 412
 413         seq = get_seq(ts, addr);
 414         if (!seq)
 415                 return -1;
 416
 417         switch (seq->state) {
 418         case SEQ_STATE_UNINITIALIZED:
 419         case SEQ_STATE_RELEASED:
 420                 if (!flag) {
 421                         seq->state = SEQ_STATE_ACQUIRING;
 422                 } else {
 423                         if (flag & TRY_LOCK)
 424                                 ls->nr_trylock++;
 425                         if (flag & READ_LOCK)
 426                                 ls->nr_readlock++;
 427                         seq->state = SEQ_STATE_READ_ACQUIRED;
 428                         seq->read_count = 1;
 429                         ls->nr_acquired++;
 430                 }
 431                 break;
 432         case SEQ_STATE_READ_ACQUIRED:
 433                 if (flag & READ_LOCK) {
 434                         seq->read_count++;
 435                         ls->nr_acquired++;
 436                         goto end;
 437                 } else {
 438                         goto broken;
 439                 }
 440                 break;
 441         case SEQ_STATE_ACQUIRED:
 442         case SEQ_STATE_ACQUIRING:
 443         case SEQ_STATE_CONTENDED:
 444 broken:
 445                 /* broken lock sequence, discard it */
 446                 ls->discard = 1;
 447                 bad_hist[BROKEN_ACQUIRE]++;
 448                 list_del(&seq->list);
 449                 free(seq);
 450                 goto end;
 451                 break;
 452         default:
 453                 BUG_ON("Unknown state of lock sequence found!\n");
 454                 break;
 455         }
 456
 457         ls->nr_acquire++;
 458         seq->prev_event_time = sample->time;
 459 end:
 460         return 0;
 461 }
 462
 463 static int report_lock_acquired_event(struct perf_evsel *evsel,
 464                                       struct perf_sample *sample)
 465 {
 466         void *addr;
 467         struct lock_stat *ls;
 468         struct thread_stat *ts;
 469         struct lock_seq_stat *seq;
 470         u64 contended_term;
 471         const char *name = perf_evsel__strval(evsel, sample, "name");
 472         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 473
 474         memcpy(&addr, &tmp, sizeof(void *));
 475
 476         ls = lock_stat_findnew(addr, name);
 477         if (!ls)
 478                 return -1;
 479         if (ls->discard)
 480                 return 0;
 481
 482         ts = thread_stat_findnew(sample->tid);
 483         if (!ts)
 484                 return -1;
 485
 486         seq = get_seq(ts, addr);
 487         if (!seq)
 488                 return -1;
 489
 490         switch (seq->state) {
 491         case SEQ_STATE_UNINITIALIZED:
 492                 /* orphan event, do nothing */
 493                 return 0;
 494         case SEQ_STATE_ACQUIRING:
 495                 break;
 496         case SEQ_STATE_CONTENDED:
 497                 contended_term = sample->time - seq->prev_event_time;
 498                 ls->wait_time_total += contended_term;
 499                 if (contended_term < ls->wait_time_min)
 500                         ls->wait_time_min = contended_term;
 501                 if (ls->wait_time_max < contended_term)
 502                         ls->wait_time_max = contended_term;
 503                 break;
 504         case SEQ_STATE_RELEASED:
 505         case SEQ_STATE_ACQUIRED:
 506         case SEQ_STATE_READ_ACQUIRED:
 507                 /* broken lock sequence, discard it */
 508                 ls->discard = 1;
 509                 bad_hist[BROKEN_ACQUIRED]++;
 510                 list_del(&seq->list);
 511                 free(seq);
 512                 goto end;
 513                 break;
 514
 515         default:
 516                 BUG_ON("Unknown state of lock sequence found!\n");
 517                 break;
 518         }
 519
 520         seq->state = SEQ_STATE_ACQUIRED;
 521         ls->nr_acquired++;
 522         seq->prev_event_time = sample->time;
 523 end:
 524         return 0;
 525 }
 526
 527 static int report_lock_contended_event(struct perf_evsel *evsel,
 528                                        struct perf_sample *sample)
 529 {
 530         void *addr;
 531         struct lock_stat *ls;
 532         struct thread_stat *ts;
 533         struct lock_seq_stat *seq;
 534         const char *name = perf_evsel__strval(evsel, sample, "name");
 535         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 536
 537         memcpy(&addr, &tmp, sizeof(void *));
 538
 539         ls = lock_stat_findnew(addr, name);
 540         if (!ls)
 541                 return -1;
 542         if (ls->discard)
 543                 return 0;
 544
 545         ts = thread_stat_findnew(sample->tid);
 546         if (!ts)
 547                 return -1;
 548
 549         seq = get_seq(ts, addr);
 550         if (!seq)
 551                 return -1;
 552
 553         switch (seq->state) {
 554         case SEQ_STATE_UNINITIALIZED:
 555                 /* orphan event, do nothing */
 556                 return 0;
 557         case SEQ_STATE_ACQUIRING:
 558                 break;
 559         case SEQ_STATE_RELEASED:
 560         case SEQ_STATE_ACQUIRED:
 561         case SEQ_STATE_READ_ACQUIRED:
 562         case SEQ_STATE_CONTENDED:
 563                 /* broken lock sequence, discard it */
 564                 ls->discard = 1;
 565                 bad_hist[BROKEN_CONTENDED]++;
 566                 list_del(&seq->list);
 567                 free(seq);
 568                 goto end;
 569                 break;
 570         default:
 571                 BUG_ON("Unknown state of lock sequence found!\n");
 572                 break;
 573         }
 574
 575         seq->state = SEQ_STATE_CONTENDED;
 576         ls->nr_contended++;
 577         seq->prev_event_time = sample->time;
 578 end:
 579         return 0;
 580 }
 581
 582 static int report_lock_release_event(struct perf_evsel *evsel,
 583                                      struct perf_sample *sample)
 584 {
 585         void *addr;
 586         struct lock_stat *ls;
 587         struct thread_stat *ts;
 588         struct lock_seq_stat *seq;
 589         const char *name = perf_evsel__strval(evsel, sample, "name");
 590         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
 591
 592         memcpy(&addr, &tmp, sizeof(void *));
 593
 594         ls = lock_stat_findnew(addr, name);
 595         if (!ls)
 596                 return -1;
 597         if (ls->discard)
 598                 return 0;
 599
 600         ts = thread_stat_findnew(sample->tid);
 601         if (!ts)
 602                 return -1;
 603
 604         seq = get_seq(ts, addr);
 605         if (!seq)
 606                 return -1;
 607
 608         switch (seq->state) {
 609         case SEQ_STATE_UNINITIALIZED:
 610                 goto end;
 611                 break;
 612         case SEQ_STATE_ACQUIRED:
 613                 break;
 614         case SEQ_STATE_READ_ACQUIRED:
 615                 seq->read_count--;
 616                 BUG_ON(seq->read_count < 0);
 617                 if (!seq->read_count) {
 618                         ls->nr_release++;
 619                         goto end;
 620                 }
 621                 break;
 622         case SEQ_STATE_ACQUIRING:
 623         case SEQ_STATE_CONTENDED:
 624         case SEQ_STATE_RELEASED:
 625                 /* broken lock sequence, discard it */
 626                 ls->discard = 1;
 627                 bad_hist[BROKEN_RELEASE]++;
 628                 goto free_seq;
 629                 break;
 630         default:
 631                 BUG_ON("Unknown state of lock sequence found!\n");
 632                 break;
 633         }
 634
 635         ls->nr_release++;
 636 free_seq:
 637         list_del(&seq->list);
 638         free(seq);
 639 end:
 640         return 0;
 641 }
 642
 643 /* lock oriented handlers */
 644 /* TODO: handlers for CPU oriented, thread oriented */
 645 static struct trace_lock_handler report_lock_ops  = {
 646         .acquire_event          = report_lock_acquire_event,
 647         .acquired_event         = report_lock_acquired_event,
 648         .contended_event        = report_lock_contended_event,
 649         .release_event          = report_lock_release_event,
 650 };
 651
 652 static struct trace_lock_handler *trace_handler;
 653
 654 static int perf_evsel__process_lock_acquire(struct perf_evsel *evsel,
 655                                              struct perf_sample *sample)
 656 {
 657         if (trace_handler->acquire_event)
 658                 return trace_handler->acquire_event(evsel, sample);
 659         return 0;
 660 }
 661
 662 static int perf_evsel__process_lock_acquired(struct perf_evsel *evsel,
 663                                               struct perf_sample *sample)
 664 {
 665         if (trace_handler->acquired_event)
 666                 return trace_handler->acquired_event(evsel, sample);
 667         return 0;
 668 }
 669
 670 static int perf_evsel__process_lock_contended(struct perf_evsel *evsel,
 671                                               struct perf_sample *sample)
 672 {
 673         if (trace_handler->contended_event)
 674                 return trace_handler->contended_event(evsel, sample);
 675         return 0;
 676 }
 677
 678 static int perf_evsel__process_lock_release(struct perf_evsel *evsel,
 679                                             struct perf_sample *sample)
 680 {
 681         if (trace_handler->release_event)
 682                 return trace_handler->release_event(evsel, sample);
 683         return 0;
 684 }
 685
 686 static void print_bad_events(int bad, int total)
 687 {
 688         /* Output for debug, this have to be removed */
 689         int i;
 690         const char *name[4] =
 691                 { "acquire", "acquired", "contended", "release" };
 692
 693         pr_info("\n=== output for debug===\n\n");
 694         pr_info("bad: %d, total: %d\n", bad, total);
 695         pr_info("bad rate: %f %%\n", (double)bad / (double)total * 100);
 696         pr_info("histogram of events caused bad sequence\n");
 697         for (i = 0; i < BROKEN_MAX; i++)
 698                 pr_info(" %10s: %d\n", name[i], bad_hist[i]);
 699 }
 700
 701 /* TODO: various way to print, coloring, nano or milli sec */
 702 static void print_result(void)
 703 {
 704         struct lock_stat *st;
 705         char cut_name[20];
 706         int bad, total;
 707
 708         pr_info("%20s ", "Name");
 709         pr_info("%10s ", "acquired");
 710         pr_info("%10s ", "contended");
 711
 712         pr_info("%15s ", "total wait (ns)");
 713         pr_info("%15s ", "max wait (ns)");
 714         pr_info("%15s ", "min wait (ns)");
 715
 716         pr_info("\n\n");
 717
 718         bad = total = 0;
 719         while ((st = pop_from_result())) {
 720                 total++;
 721                 if (st->discard) {
 722                         bad++;
 723                         continue;
 724                 }
 725                 bzero(cut_name, 20);
 726
 727                 if (strlen(st->name) < 16) {
 728                         /* output raw name */
 729                         pr_info("%20s ", st->name);
 730                 } else {
 731                         strncpy(cut_name, st->name, 16);
 732                         cut_name[16] = '.';
 733                         cut_name[17] = '.';
 734                         cut_name[18] = '.';
 735                         cut_name[19] = '\0';
 736                         /* cut off name for saving output style */
 737                         pr_info("%20s ", cut_name);
 738                 }
 739
 740                 pr_info("%10u ", st->nr_acquired);
 741                 pr_info("%10u ", st->nr_contended);
 742
 743                 pr_info("%15" PRIu64 " ", st->wait_time_total);
 744                 pr_info("%15" PRIu64 " ", st->wait_time_max);
 745                 pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
 746                        0 : st->wait_time_min);
 747                 pr_info("\n");
 748         }
 749
 750         print_bad_events(bad, total);
 751 }
 752
 753 static bool info_threads, info_map;
 754
 755 static void dump_threads(void)
 756 {
 757         struct thread_stat *st;
 758         struct rb_node *node;
 759         struct thread *t;
 760
 761         pr_info("%10s: comm\n", "Thread ID");
 762
 763         node = rb_first(&thread_stats);
 764         while (node) {
 765                 st = container_of(node, struct thread_stat, rb);
 766                 t = perf_session__findnew(session, st->tid);
 767                 pr_info("%10d: %s\n", st->tid, t->comm);
 768                 node = rb_next(node);
 769         };
 770 }
 771
 772 static void dump_map(void)
 773 {
 774         unsigned int i;
 775         struct lock_stat *st;
 776
 777         pr_info("Address of instance: name of class\n");
 778         for (i = 0; i < LOCKHASH_SIZE; i++) {
 779                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
 780                         pr_info(" %p: %s\n", st->addr, st->name);
 781                 }
 782         }
 783 }
 784
 785 static int dump_info(void)
 786 {
 787         int rc = 0;
 788
 789         if (info_threads)
 790                 dump_threads();
 791         else if (info_map)
 792                 dump_map();
 793         else {
 794                 rc = -1;
 795                 pr_err("Unknown type of information\n");
 796         }
 797
 798         return rc;
 799 }
 800
 801 typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
 802                                   struct perf_sample *sample);
 803
 804 static int process_sample_event(struct perf_tool *tool __maybe_unused,
 805                                 union perf_event *event,
 806                                 struct perf_sample *sample,
 807                                 struct perf_evsel *evsel,
 808                                 struct machine *machine)
 809 {
 810         struct thread *thread = machine__findnew_thread(machine, sample->tid);
 811
 812         if (thread == NULL) {
 813                 pr_debug("problem processing %d event, skipping it.\n",
 814                         event->header.type);
 815                 return -1;
 816         }
 817
 818         if (evsel->handler.func != NULL) {
 819                 tracepoint_handler f = evsel->handler.func;
 820                 return f(evsel, sample);
 821         }
 822
 823         return 0;
 824 }
 825
 826 static const struct perf_evsel_str_handler lock_tracepoints[] = {
 827         { "lock:lock_acquire",   perf_evsel__process_lock_acquire,   }, /* CONFIG_LOCKDEP */
 828         { "lock:lock_acquired",  perf_evsel__process_lock_acquired,  }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
 829         { "lock:lock_contended", perf_evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
 830         { "lock:lock_release",   perf_evsel__process_lock_release,   }, /* CONFIG_LOCKDEP */
 831 };
 832
 833 static int read_events(void)
 834 {
 835         struct perf_tool eops = {
 836                 .sample          = process_sample_event,
 837                 .comm            = perf_event__process_comm,
 838                 .ordered_samples = true,
 839         };
 840         session = perf_session__new(input_name, O_RDONLY, 0, false, &eops);
 841         if (!session) {
 842                 pr_err("Initializing perf session failed\n");
 843                 return -1;
 844         }
 845
 846         if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
 847                 pr_err("Initializing perf session tracepoint handlers failed\n");
 848                 return -1;
 849         }
 850
 851         return perf_session__process_events(session, &eops);
 852 }
 853
 854 static void sort_result(void)
 855 {
 856         unsigned int i;
 857         struct lock_stat *st;
 858
 859         for (i = 0; i < LOCKHASH_SIZE; i++) {
 860                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
 861                         insert_to_result(st, compare);
 862                 }
 863         }
 864 }
 865
 866 static int __cmd_report(void)
 867 {
 868         setup_pager();
 869
 870         if ((select_key() != 0) ||
 871             (read_events() != 0))
 872                 return -1;
 873
 874         sort_result();
 875         print_result();
 876
 877         return 0;
 878 }
 879
 880 static int __cmd_record(int argc, const char **argv)
 881 {
 882         const char *record_args[] = {
 883                 "record", "-R", "-f", "-m", "1024", "-c", "1",
 884         };
 885         unsigned int rec_argc, i, j;
 886         const char **rec_argv;
 887
 888         for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
 889                 if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
 890                                 pr_err("tracepoint %s is not enabled. "
 891                                        "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
 892                                        lock_tracepoints[i].name);
 893                                 return 1;
 894                 }
 895         }
 896
 897         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
 898         /* factor of 2 is for -e in front of each tracepoint */
 899         rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
 900
 901         rec_argv = calloc(rec_argc + 1, sizeof(char *));
 902         if (rec_argv == NULL)
 903                 return -ENOMEM;
 904
 905         for (i = 0; i < ARRAY_SIZE(record_args); i++)
 906                 rec_argv[i] = strdup(record_args[i]);
 907
 908         for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
 909                 rec_argv[i++] = "-e";
 910                 rec_argv[i++] = strdup(lock_tracepoints[j].name);
 911         }
 912
 913         for (j = 1; j < (unsigned int)argc; j++, i++)
 914                 rec_argv[i] = argv[j];
 915
 916         BUG_ON(i != rec_argc);
 917
 918         return cmd_record(i, rec_argv, NULL);
 919 }
 920
 921 int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 922 {
 923         const struct option info_options[] = {
 924         OPT_BOOLEAN('t', "threads", &info_threads,
 925                     "dump thread list in perf.data"),
 926         OPT_BOOLEAN('m', "map", &info_map,
 927                     "map of lock instances (address:name table)"),
 928         OPT_END()
 929         };
 930         const struct option lock_options[] = {
 931         OPT_STRING('i', "input", &input_name, "file", "input file name"),
 932         OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
 933         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
 934         OPT_END()
 935         };
 936         const struct option report_options[] = {
 937         OPT_STRING('k', "key", &sort_key, "acquired",
 938                     "key for sorting (acquired / contended / wait_total / wait_max / wait_min)"),
 939         /* TODO: type */
 940         OPT_END()
 941         };
 942         const char * const info_usage[] = {
 943                 "perf lock info [<options>]",
 944                 NULL
 945         };
 946         const char * const lock_usage[] = {
 947                 "perf lock [<options>] {record|report|script|info}",
 948                 NULL
 949         };
 950         const char * const report_usage[] = {
 951                 "perf lock report [<options>]",
 952                 NULL
 953         };
 954         unsigned int i;
 955         int rc = 0;
 956
 957         symbol__init();
 958         for (i = 0; i < LOCKHASH_SIZE; i++)
 959                 INIT_LIST_HEAD(lockhash_table + i);
 960
 961         argc = parse_options(argc, argv, lock_options, lock_usage,
 962                              PARSE_OPT_STOP_AT_NON_OPTION);
 963         if (!argc)
 964                 usage_with_options(lock_usage, lock_options);
 965
 966         if (!strncmp(argv[0], "rec", 3)) {
 967                 return __cmd_record(argc, argv);
 968         } else if (!strncmp(argv[0], "report", 6)) {
 969                 trace_handler = &report_lock_ops;
 970                 if (argc) {
 971                         argc = parse_options(argc, argv,
 972                                              report_options, report_usage, 0);
 973                         if (argc)
 974                                 usage_with_options(report_usage, report_options);
 975                 }
 976                 __cmd_report();
 977         } else if (!strcmp(argv[0], "script")) {
 978                 /* Aliased to 'perf script' */
 979                 return cmd_script(argc, argv, prefix);
 980         } else if (!strcmp(argv[0], "info")) {
 981                 if (argc) {
 982                         argc = parse_options(argc, argv,
 983                                              info_options, info_usage, 0);
 984                         if (argc)
 985                                 usage_with_options(info_usage, info_options);
 986                 }
 987                 /* recycling report_lock_ops */
 988                 trace_handler = &report_lock_ops;
 989                 setup_pager();
 990                 if (read_events() != 0)
 991                         rc = -1;
 992                 else
 993                         rc = dump_info();
 994         } else {
 995                 usage_with_options(lock_usage, lock_options);
 996         }
 997
 998         return rc;
 999 }