linux/tools/perf/builtin-lock.c
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   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
  29static struct perf_session *session;
  30
  31/* based on kernel/lockdep.c */
  32#define LOCKHASH_BITS           12
  33#define LOCKHASH_SIZE           (1UL << LOCKHASH_BITS)
  34
  35static 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
  40struct 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 */
  97struct 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
 106struct thread_stat {
 107        struct rb_node          rb;
 108
 109        u32                     tid;
 110        struct list_head        seq_list;
 111};
 112
 113static struct rb_root           thread_stats;
 114
 115static 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
 134static 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
 156static 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
 178static struct thread_stat *thread_stat_findnew_first(u32 tid);
 179static struct thread_stat *(*thread_stat_findnew)(u32 tid) =
 180        thread_stat_findnew_first;
 181
 182static 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
 209SINGLE_KEY(nr_acquired)
 210SINGLE_KEY(nr_contended)
 211SINGLE_KEY(wait_time_total)
 212SINGLE_KEY(wait_time_max)
 213
 214static 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
 226struct 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
 236static const char               *sort_key = "acquired";
 237
 238static int                      (*compare)(struct lock_stat *, struct lock_stat *);
 239
 240static 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 }
 244struct 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
 256static 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
 272static 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 */
 294static 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
 308static 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
 333alloc_failed:
 334        pr_err("memory allocation failed\n");
 335        return NULL;
 336}
 337
 338static const char *input_name;
 339
 340struct 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
 354static 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
 375enum broken_state {
 376        BROKEN_ACQUIRE,
 377        BROKEN_ACQUIRED,
 378        BROKEN_CONTENDED,
 379        BROKEN_RELEASE,
 380        BROKEN_MAX,
 381};
 382
 383static int bad_hist[BROKEN_MAX];
 384
 385enum acquire_flags {
 386        TRY_LOCK = 1,
 387        READ_LOCK = 2,
 388};
 389
 390static 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:
 444broken:
 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;
 459end:
 460        return 0;
 461}
 462
 463static 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;
 523end:
 524        return 0;
 525}
 526
 527static 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;
 578end:
 579        return 0;
 580}
 581
 582static 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++;
 636free_seq:
 637        list_del(&seq->list);
 638        free(seq);
 639end:
 640        return 0;
 641}
 642
 643/* lock oriented handlers */
 644/* TODO: handlers for CPU oriented, thread oriented */
 645static 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
 652static struct trace_lock_handler *trace_handler;
 653
 654static 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
 662static 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
 670static 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
 678static 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
 686static 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 */
 702static 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
 753static bool info_threads, info_map;
 754
 755static 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
 772static 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
 785static 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
 801typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
 802                                  struct perf_sample *sample);
 803
 804static 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
 826static 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
 833static 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
 854static 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
 866static 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
 880static 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
 921int 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}
1000
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