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TOMOYO Linux Cross Reference
Linux/tools/perf/builtin-lock.c

Version: ~ [ linux-5.2 ] ~ [ linux-5.1.16 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.57 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.132 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.184 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.184 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.69 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 <subcmd/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 #include "util/data.h"
 19 
 20 #include <sys/types.h>
 21 #include <sys/prctl.h>
 22 #include <semaphore.h>
 23 #include <pthread.h>
 24 #include <math.h>
 25 #include <limits.h>
 26 
 27 #include <linux/list.h>
 28 #include <linux/hash.h>
 29 
 30 static struct perf_session *session;
 31 
 32 /* based on kernel/lockdep.c */
 33 #define LOCKHASH_BITS           12
 34 #define LOCKHASH_SIZE           (1UL << LOCKHASH_BITS)
 35 
 36 static struct list_head lockhash_table[LOCKHASH_SIZE];
 37 
 38 #define __lockhashfn(key)       hash_long((unsigned long)key, LOCKHASH_BITS)
 39 #define lockhashentry(key)      (lockhash_table + __lockhashfn((key)))
 40 
 41 struct lock_stat {
 42         struct list_head        hash_entry;
 43         struct rb_node          rb;             /* used for sorting */
 44 
 45         /*
 46          * FIXME: perf_evsel__intval() returns u64,
 47          * so address of lockdep_map should be dealed as 64bit.
 48          * Is there more better solution?
 49          */
 50         void                    *addr;          /* address of lockdep_map, used as ID */
 51         char                    *name;          /* for strcpy(), we cannot use const */
 52 
 53         unsigned int            nr_acquire;
 54         unsigned int            nr_acquired;
 55         unsigned int            nr_contended;
 56         unsigned int            nr_release;
 57 
 58         unsigned int            nr_readlock;
 59         unsigned int            nr_trylock;
 60 
 61         /* these times are in nano sec. */
 62         u64                     avg_wait_time;
 63         u64                     wait_time_total;
 64         u64                     wait_time_min;
 65         u64                     wait_time_max;
 66 
 67         int                     discard; /* flag of blacklist */
 68 };
 69 
 70 /*
 71  * States of lock_seq_stat
 72  *
 73  * UNINITIALIZED is required for detecting first event of acquire.
 74  * As the nature of lock events, there is no guarantee
 75  * that the first event for the locks are acquire,
 76  * it can be acquired, contended or release.
 77  */
 78 #define SEQ_STATE_UNINITIALIZED      0         /* initial state */
 79 #define SEQ_STATE_RELEASED      1
 80 #define SEQ_STATE_ACQUIRING     2
 81 #define SEQ_STATE_ACQUIRED      3
 82 #define SEQ_STATE_READ_ACQUIRED 4
 83 #define SEQ_STATE_CONTENDED     5
 84 
 85 /*
 86  * MAX_LOCK_DEPTH
 87  * Imported from include/linux/sched.h.
 88  * Should this be synchronized?
 89  */
 90 #define MAX_LOCK_DEPTH 48
 91 
 92 /*
 93  * struct lock_seq_stat:
 94  * Place to put on state of one lock sequence
 95  * 1) acquire -> acquired -> release
 96  * 2) acquire -> contended -> acquired -> release
 97  * 3) acquire (with read or try) -> release
 98  * 4) Are there other patterns?
 99  */
100 struct lock_seq_stat {
101         struct list_head        list;
102         int                     state;
103         u64                     prev_event_time;
104         void                    *addr;
105 
106         int                     read_count;
107 };
108 
109 struct thread_stat {
110         struct rb_node          rb;
111 
112         u32                     tid;
113         struct list_head        seq_list;
114 };
115 
116 static struct rb_root           thread_stats;
117 
118 static struct thread_stat *thread_stat_find(u32 tid)
119 {
120         struct rb_node *node;
121         struct thread_stat *st;
122 
123         node = thread_stats.rb_node;
124         while (node) {
125                 st = container_of(node, struct thread_stat, rb);
126                 if (st->tid == tid)
127                         return st;
128                 else if (tid < st->tid)
129                         node = node->rb_left;
130                 else
131                         node = node->rb_right;
132         }
133 
134         return NULL;
135 }
136 
137 static void thread_stat_insert(struct thread_stat *new)
138 {
139         struct rb_node **rb = &thread_stats.rb_node;
140         struct rb_node *parent = NULL;
141         struct thread_stat *p;
142 
143         while (*rb) {
144                 p = container_of(*rb, struct thread_stat, rb);
145                 parent = *rb;
146 
147                 if (new->tid < p->tid)
148                         rb = &(*rb)->rb_left;
149                 else if (new->tid > p->tid)
150                         rb = &(*rb)->rb_right;
151                 else
152                         BUG_ON("inserting invalid thread_stat\n");
153         }
154 
155         rb_link_node(&new->rb, parent, rb);
156         rb_insert_color(&new->rb, &thread_stats);
157 }
158 
159 static struct thread_stat *thread_stat_findnew_after_first(u32 tid)
160 {
161         struct thread_stat *st;
162 
163         st = thread_stat_find(tid);
164         if (st)
165                 return st;
166 
167         st = zalloc(sizeof(struct thread_stat));
168         if (!st) {
169                 pr_err("memory allocation failed\n");
170                 return NULL;
171         }
172 
173         st->tid = tid;
174         INIT_LIST_HEAD(&st->seq_list);
175 
176         thread_stat_insert(st);
177 
178         return st;
179 }
180 
181 static struct thread_stat *thread_stat_findnew_first(u32 tid);
182 static struct thread_stat *(*thread_stat_findnew)(u32 tid) =
183         thread_stat_findnew_first;
184 
185 static struct thread_stat *thread_stat_findnew_first(u32 tid)
186 {
187         struct thread_stat *st;
188 
189         st = zalloc(sizeof(struct thread_stat));
190         if (!st) {
191                 pr_err("memory allocation failed\n");
192                 return NULL;
193         }
194         st->tid = tid;
195         INIT_LIST_HEAD(&st->seq_list);
196 
197         rb_link_node(&st->rb, NULL, &thread_stats.rb_node);
198         rb_insert_color(&st->rb, &thread_stats);
199 
200         thread_stat_findnew = thread_stat_findnew_after_first;
201         return st;
202 }
203 
204 /* build simple key function one is bigger than two */
205 #define SINGLE_KEY(member)                                              \
206         static int lock_stat_key_ ## member(struct lock_stat *one,      \
207                                          struct lock_stat *two)         \
208         {                                                               \
209                 return one->member > two->member;                       \
210         }
211 
212 SINGLE_KEY(nr_acquired)
213 SINGLE_KEY(nr_contended)
214 SINGLE_KEY(avg_wait_time)
215 SINGLE_KEY(wait_time_total)
216 SINGLE_KEY(wait_time_max)
217 
218 static int lock_stat_key_wait_time_min(struct lock_stat *one,
219                                         struct lock_stat *two)
220 {
221         u64 s1 = one->wait_time_min;
222         u64 s2 = two->wait_time_min;
223         if (s1 == ULLONG_MAX)
224                 s1 = 0;
225         if (s2 == ULLONG_MAX)
226                 s2 = 0;
227         return s1 > s2;
228 }
229 
230 struct lock_key {
231         /*
232          * name: the value for specify by user
233          * this should be simpler than raw name of member
234          * e.g. nr_acquired -> acquired, wait_time_total -> wait_total
235          */
236         const char              *name;
237         int                     (*key)(struct lock_stat*, struct lock_stat*);
238 };
239 
240 static const char               *sort_key = "acquired";
241 
242 static int                      (*compare)(struct lock_stat *, struct lock_stat *);
243 
244 static struct rb_root           result; /* place to store sorted data */
245 
246 #define DEF_KEY_LOCK(name, fn_suffix)   \
247         { #name, lock_stat_key_ ## fn_suffix }
248 struct lock_key keys[] = {
249         DEF_KEY_LOCK(acquired, nr_acquired),
250         DEF_KEY_LOCK(contended, nr_contended),
251         DEF_KEY_LOCK(avg_wait, avg_wait_time),
252         DEF_KEY_LOCK(wait_total, wait_time_total),
253         DEF_KEY_LOCK(wait_min, wait_time_min),
254         DEF_KEY_LOCK(wait_max, wait_time_max),
255 
256         /* extra comparisons much complicated should be here */
257 
258         { NULL, NULL }
259 };
260 
261 static int select_key(void)
262 {
263         int i;
264 
265         for (i = 0; keys[i].name; i++) {
266                 if (!strcmp(keys[i].name, sort_key)) {
267                         compare = keys[i].key;
268                         return 0;
269                 }
270         }
271 
272         pr_err("Unknown compare key: %s\n", sort_key);
273 
274         return -1;
275 }
276 
277 static void insert_to_result(struct lock_stat *st,
278                              int (*bigger)(struct lock_stat *, struct lock_stat *))
279 {
280         struct rb_node **rb = &result.rb_node;
281         struct rb_node *parent = NULL;
282         struct lock_stat *p;
283 
284         while (*rb) {
285                 p = container_of(*rb, struct lock_stat, rb);
286                 parent = *rb;
287 
288                 if (bigger(st, p))
289                         rb = &(*rb)->rb_left;
290                 else
291                         rb = &(*rb)->rb_right;
292         }
293 
294         rb_link_node(&st->rb, parent, rb);
295         rb_insert_color(&st->rb, &result);
296 }
297 
298 /* returns left most element of result, and erase it */
299 static struct lock_stat *pop_from_result(void)
300 {
301         struct rb_node *node = result.rb_node;
302 
303         if (!node)
304                 return NULL;
305 
306         while (node->rb_left)
307                 node = node->rb_left;
308 
309         rb_erase(node, &result);
310         return container_of(node, struct lock_stat, rb);
311 }
312 
313 static struct lock_stat *lock_stat_findnew(void *addr, const char *name)
314 {
315         struct list_head *entry = lockhashentry(addr);
316         struct lock_stat *ret, *new;
317 
318         list_for_each_entry(ret, entry, hash_entry) {
319                 if (ret->addr == addr)
320                         return ret;
321         }
322 
323         new = zalloc(sizeof(struct lock_stat));
324         if (!new)
325                 goto alloc_failed;
326 
327         new->addr = addr;
328         new->name = zalloc(sizeof(char) * strlen(name) + 1);
329         if (!new->name) {
330                 free(new);
331                 goto alloc_failed;
332         }
333 
334         strcpy(new->name, name);
335         new->wait_time_min = ULLONG_MAX;
336 
337         list_add(&new->hash_entry, entry);
338         return new;
339 
340 alloc_failed:
341         pr_err("memory allocation failed\n");
342         return NULL;
343 }
344 
345 struct trace_lock_handler {
346         int (*acquire_event)(struct perf_evsel *evsel,
347                              struct perf_sample *sample);
348 
349         int (*acquired_event)(struct perf_evsel *evsel,
350                               struct perf_sample *sample);
351 
352         int (*contended_event)(struct perf_evsel *evsel,
353                                struct perf_sample *sample);
354 
355         int (*release_event)(struct perf_evsel *evsel,
356                              struct perf_sample *sample);
357 };
358 
359 static struct lock_seq_stat *get_seq(struct thread_stat *ts, void *addr)
360 {
361         struct lock_seq_stat *seq;
362 
363         list_for_each_entry(seq, &ts->seq_list, list) {
364                 if (seq->addr == addr)
365                         return seq;
366         }
367 
368         seq = zalloc(sizeof(struct lock_seq_stat));
369         if (!seq) {
370                 pr_err("memory allocation failed\n");
371                 return NULL;
372         }
373         seq->state = SEQ_STATE_UNINITIALIZED;
374         seq->addr = addr;
375 
376         list_add(&seq->list, &ts->seq_list);
377         return seq;
378 }
379 
380 enum broken_state {
381         BROKEN_ACQUIRE,
382         BROKEN_ACQUIRED,
383         BROKEN_CONTENDED,
384         BROKEN_RELEASE,
385         BROKEN_MAX,
386 };
387 
388 static int bad_hist[BROKEN_MAX];
389 
390 enum acquire_flags {
391         TRY_LOCK = 1,
392         READ_LOCK = 2,
393 };
394 
395 static int report_lock_acquire_event(struct perf_evsel *evsel,
396                                      struct perf_sample *sample)
397 {
398         void *addr;
399         struct lock_stat *ls;
400         struct thread_stat *ts;
401         struct lock_seq_stat *seq;
402         const char *name = perf_evsel__strval(evsel, sample, "name");
403         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
404         int flag = perf_evsel__intval(evsel, sample, "flag");
405 
406         memcpy(&addr, &tmp, sizeof(void *));
407 
408         ls = lock_stat_findnew(addr, name);
409         if (!ls)
410                 return -ENOMEM;
411         if (ls->discard)
412                 return 0;
413 
414         ts = thread_stat_findnew(sample->tid);
415         if (!ts)
416                 return -ENOMEM;
417 
418         seq = get_seq(ts, addr);
419         if (!seq)
420                 return -ENOMEM;
421 
422         switch (seq->state) {
423         case SEQ_STATE_UNINITIALIZED:
424         case SEQ_STATE_RELEASED:
425                 if (!flag) {
426                         seq->state = SEQ_STATE_ACQUIRING;
427                 } else {
428                         if (flag & TRY_LOCK)
429                                 ls->nr_trylock++;
430                         if (flag & READ_LOCK)
431                                 ls->nr_readlock++;
432                         seq->state = SEQ_STATE_READ_ACQUIRED;
433                         seq->read_count = 1;
434                         ls->nr_acquired++;
435                 }
436                 break;
437         case SEQ_STATE_READ_ACQUIRED:
438                 if (flag & READ_LOCK) {
439                         seq->read_count++;
440                         ls->nr_acquired++;
441                         goto end;
442                 } else {
443                         goto broken;
444                 }
445                 break;
446         case SEQ_STATE_ACQUIRED:
447         case SEQ_STATE_ACQUIRING:
448         case SEQ_STATE_CONTENDED:
449 broken:
450                 /* broken lock sequence, discard it */
451                 ls->discard = 1;
452                 bad_hist[BROKEN_ACQUIRE]++;
453                 list_del(&seq->list);
454                 free(seq);
455                 goto end;
456         default:
457                 BUG_ON("Unknown state of lock sequence found!\n");
458                 break;
459         }
460 
461         ls->nr_acquire++;
462         seq->prev_event_time = sample->time;
463 end:
464         return 0;
465 }
466 
467 static int report_lock_acquired_event(struct perf_evsel *evsel,
468                                       struct perf_sample *sample)
469 {
470         void *addr;
471         struct lock_stat *ls;
472         struct thread_stat *ts;
473         struct lock_seq_stat *seq;
474         u64 contended_term;
475         const char *name = perf_evsel__strval(evsel, sample, "name");
476         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
477 
478         memcpy(&addr, &tmp, sizeof(void *));
479 
480         ls = lock_stat_findnew(addr, name);
481         if (!ls)
482                 return -ENOMEM;
483         if (ls->discard)
484                 return 0;
485 
486         ts = thread_stat_findnew(sample->tid);
487         if (!ts)
488                 return -ENOMEM;
489 
490         seq = get_seq(ts, addr);
491         if (!seq)
492                 return -ENOMEM;
493 
494         switch (seq->state) {
495         case SEQ_STATE_UNINITIALIZED:
496                 /* orphan event, do nothing */
497                 return 0;
498         case SEQ_STATE_ACQUIRING:
499                 break;
500         case SEQ_STATE_CONTENDED:
501                 contended_term = sample->time - seq->prev_event_time;
502                 ls->wait_time_total += contended_term;
503                 if (contended_term < ls->wait_time_min)
504                         ls->wait_time_min = contended_term;
505                 if (ls->wait_time_max < contended_term)
506                         ls->wait_time_max = contended_term;
507                 break;
508         case SEQ_STATE_RELEASED:
509         case SEQ_STATE_ACQUIRED:
510         case SEQ_STATE_READ_ACQUIRED:
511                 /* broken lock sequence, discard it */
512                 ls->discard = 1;
513                 bad_hist[BROKEN_ACQUIRED]++;
514                 list_del(&seq->list);
515                 free(seq);
516                 goto end;
517         default:
518                 BUG_ON("Unknown state of lock sequence found!\n");
519                 break;
520         }
521 
522         seq->state = SEQ_STATE_ACQUIRED;
523         ls->nr_acquired++;
524         ls->avg_wait_time = ls->nr_contended ? ls->wait_time_total/ls->nr_contended : 0;
525         seq->prev_event_time = sample->time;
526 end:
527         return 0;
528 }
529 
530 static int report_lock_contended_event(struct perf_evsel *evsel,
531                                        struct perf_sample *sample)
532 {
533         void *addr;
534         struct lock_stat *ls;
535         struct thread_stat *ts;
536         struct lock_seq_stat *seq;
537         const char *name = perf_evsel__strval(evsel, sample, "name");
538         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
539 
540         memcpy(&addr, &tmp, sizeof(void *));
541 
542         ls = lock_stat_findnew(addr, name);
543         if (!ls)
544                 return -ENOMEM;
545         if (ls->discard)
546                 return 0;
547 
548         ts = thread_stat_findnew(sample->tid);
549         if (!ts)
550                 return -ENOMEM;
551 
552         seq = get_seq(ts, addr);
553         if (!seq)
554                 return -ENOMEM;
555 
556         switch (seq->state) {
557         case SEQ_STATE_UNINITIALIZED:
558                 /* orphan event, do nothing */
559                 return 0;
560         case SEQ_STATE_ACQUIRING:
561                 break;
562         case SEQ_STATE_RELEASED:
563         case SEQ_STATE_ACQUIRED:
564         case SEQ_STATE_READ_ACQUIRED:
565         case SEQ_STATE_CONTENDED:
566                 /* broken lock sequence, discard it */
567                 ls->discard = 1;
568                 bad_hist[BROKEN_CONTENDED]++;
569                 list_del(&seq->list);
570                 free(seq);
571                 goto end;
572         default:
573                 BUG_ON("Unknown state of lock sequence found!\n");
574                 break;
575         }
576 
577         seq->state = SEQ_STATE_CONTENDED;
578         ls->nr_contended++;
579         ls->avg_wait_time = ls->wait_time_total/ls->nr_contended;
580         seq->prev_event_time = sample->time;
581 end:
582         return 0;
583 }
584 
585 static int report_lock_release_event(struct perf_evsel *evsel,
586                                      struct perf_sample *sample)
587 {
588         void *addr;
589         struct lock_stat *ls;
590         struct thread_stat *ts;
591         struct lock_seq_stat *seq;
592         const char *name = perf_evsel__strval(evsel, sample, "name");
593         u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
594 
595         memcpy(&addr, &tmp, sizeof(void *));
596 
597         ls = lock_stat_findnew(addr, name);
598         if (!ls)
599                 return -ENOMEM;
600         if (ls->discard)
601                 return 0;
602 
603         ts = thread_stat_findnew(sample->tid);
604         if (!ts)
605                 return -ENOMEM;
606 
607         seq = get_seq(ts, addr);
608         if (!seq)
609                 return -ENOMEM;
610 
611         switch (seq->state) {
612         case SEQ_STATE_UNINITIALIZED:
613                 goto end;
614         case SEQ_STATE_ACQUIRED:
615                 break;
616         case SEQ_STATE_READ_ACQUIRED:
617                 seq->read_count--;
618                 BUG_ON(seq->read_count < 0);
619                 if (!seq->read_count) {
620                         ls->nr_release++;
621                         goto end;
622                 }
623                 break;
624         case SEQ_STATE_ACQUIRING:
625         case SEQ_STATE_CONTENDED:
626         case SEQ_STATE_RELEASED:
627                 /* broken lock sequence, discard it */
628                 ls->discard = 1;
629                 bad_hist[BROKEN_RELEASE]++;
630                 goto free_seq;
631         default:
632                 BUG_ON("Unknown state of lock sequence found!\n");
633                 break;
634         }
635 
636         ls->nr_release++;
637 free_seq:
638         list_del(&seq->list);
639         free(seq);
640 end:
641         return 0;
642 }
643 
644 /* lock oriented handlers */
645 /* TODO: handlers for CPU oriented, thread oriented */
646 static struct trace_lock_handler report_lock_ops  = {
647         .acquire_event          = report_lock_acquire_event,
648         .acquired_event         = report_lock_acquired_event,
649         .contended_event        = report_lock_contended_event,
650         .release_event          = report_lock_release_event,
651 };
652 
653 static struct trace_lock_handler *trace_handler;
654 
655 static int perf_evsel__process_lock_acquire(struct perf_evsel *evsel,
656                                              struct perf_sample *sample)
657 {
658         if (trace_handler->acquire_event)
659                 return trace_handler->acquire_event(evsel, sample);
660         return 0;
661 }
662 
663 static int perf_evsel__process_lock_acquired(struct perf_evsel *evsel,
664                                               struct perf_sample *sample)
665 {
666         if (trace_handler->acquired_event)
667                 return trace_handler->acquired_event(evsel, sample);
668         return 0;
669 }
670 
671 static int perf_evsel__process_lock_contended(struct perf_evsel *evsel,
672                                               struct perf_sample *sample)
673 {
674         if (trace_handler->contended_event)
675                 return trace_handler->contended_event(evsel, sample);
676         return 0;
677 }
678 
679 static int perf_evsel__process_lock_release(struct perf_evsel *evsel,
680                                             struct perf_sample *sample)
681 {
682         if (trace_handler->release_event)
683                 return trace_handler->release_event(evsel, sample);
684         return 0;
685 }
686 
687 static void print_bad_events(int bad, int total)
688 {
689         /* Output for debug, this have to be removed */
690         int i;
691         const char *name[4] =
692                 { "acquire", "acquired", "contended", "release" };
693 
694         pr_info("\n=== output for debug===\n\n");
695         pr_info("bad: %d, total: %d\n", bad, total);
696         pr_info("bad rate: %.2f %%\n", (double)bad / (double)total * 100);
697         pr_info("histogram of events caused bad sequence\n");
698         for (i = 0; i < BROKEN_MAX; i++)
699                 pr_info(" %10s: %d\n", name[i], bad_hist[i]);
700 }
701 
702 /* TODO: various way to print, coloring, nano or milli sec */
703 static void print_result(void)
704 {
705         struct lock_stat *st;
706         char cut_name[20];
707         int bad, total;
708 
709         pr_info("%20s ", "Name");
710         pr_info("%10s ", "acquired");
711         pr_info("%10s ", "contended");
712 
713         pr_info("%15s ", "avg wait (ns)");
714         pr_info("%15s ", "total wait (ns)");
715         pr_info("%15s ", "max wait (ns)");
716         pr_info("%15s ", "min wait (ns)");
717 
718         pr_info("\n\n");
719 
720         bad = total = 0;
721         while ((st = pop_from_result())) {
722                 total++;
723                 if (st->discard) {
724                         bad++;
725                         continue;
726                 }
727                 bzero(cut_name, 20);
728 
729                 if (strlen(st->name) < 16) {
730                         /* output raw name */
731                         pr_info("%20s ", st->name);
732                 } else {
733                         strncpy(cut_name, st->name, 16);
734                         cut_name[16] = '.';
735                         cut_name[17] = '.';
736                         cut_name[18] = '.';
737                         cut_name[19] = '\0';
738                         /* cut off name for saving output style */
739                         pr_info("%20s ", cut_name);
740                 }
741 
742                 pr_info("%10u ", st->nr_acquired);
743                 pr_info("%10u ", st->nr_contended);
744 
745                 pr_info("%15" PRIu64 " ", st->avg_wait_time);
746                 pr_info("%15" PRIu64 " ", st->wait_time_total);
747                 pr_info("%15" PRIu64 " ", st->wait_time_max);
748                 pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
749                        0 : st->wait_time_min);
750                 pr_info("\n");
751         }
752 
753         print_bad_events(bad, total);
754 }
755 
756 static bool info_threads, info_map;
757 
758 static void dump_threads(void)
759 {
760         struct thread_stat *st;
761         struct rb_node *node;
762         struct thread *t;
763 
764         pr_info("%10s: comm\n", "Thread ID");
765 
766         node = rb_first(&thread_stats);
767         while (node) {
768                 st = container_of(node, struct thread_stat, rb);
769                 t = perf_session__findnew(session, st->tid);
770                 pr_info("%10d: %s\n", st->tid, thread__comm_str(t));
771                 node = rb_next(node);
772                 thread__put(t);
773         };
774 }
775 
776 static void dump_map(void)
777 {
778         unsigned int i;
779         struct lock_stat *st;
780 
781         pr_info("Address of instance: name of class\n");
782         for (i = 0; i < LOCKHASH_SIZE; i++) {
783                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
784                         pr_info(" %p: %s\n", st->addr, st->name);
785                 }
786         }
787 }
788 
789 static int dump_info(void)
790 {
791         int rc = 0;
792 
793         if (info_threads)
794                 dump_threads();
795         else if (info_map)
796                 dump_map();
797         else {
798                 rc = -1;
799                 pr_err("Unknown type of information\n");
800         }
801 
802         return rc;
803 }
804 
805 typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
806                                   struct perf_sample *sample);
807 
808 static int process_sample_event(struct perf_tool *tool __maybe_unused,
809                                 union perf_event *event,
810                                 struct perf_sample *sample,
811                                 struct perf_evsel *evsel,
812                                 struct machine *machine)
813 {
814         int err = 0;
815         struct thread *thread = machine__findnew_thread(machine, sample->pid,
816                                                         sample->tid);
817 
818         if (thread == NULL) {
819                 pr_debug("problem processing %d event, skipping it.\n",
820                         event->header.type);
821                 return -1;
822         }
823 
824         if (evsel->handler != NULL) {
825                 tracepoint_handler f = evsel->handler;
826                 err = f(evsel, sample);
827         }
828 
829         thread__put(thread);
830 
831         return err;
832 }
833 
834 static void sort_result(void)
835 {
836         unsigned int i;
837         struct lock_stat *st;
838 
839         for (i = 0; i < LOCKHASH_SIZE; i++) {
840                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
841                         insert_to_result(st, compare);
842                 }
843         }
844 }
845 
846 static const struct perf_evsel_str_handler lock_tracepoints[] = {
847         { "lock:lock_acquire",   perf_evsel__process_lock_acquire,   }, /* CONFIG_LOCKDEP */
848         { "lock:lock_acquired",  perf_evsel__process_lock_acquired,  }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
849         { "lock:lock_contended", perf_evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
850         { "lock:lock_release",   perf_evsel__process_lock_release,   }, /* CONFIG_LOCKDEP */
851 };
852 
853 static bool force;
854 
855 static int __cmd_report(bool display_info)
856 {
857         int err = -EINVAL;
858         struct perf_tool eops = {
859                 .sample          = process_sample_event,
860                 .comm            = perf_event__process_comm,
861                 .ordered_events  = true,
862         };
863         struct perf_data_file file = {
864                 .path = input_name,
865                 .mode = PERF_DATA_MODE_READ,
866                 .force = force,
867         };
868 
869         session = perf_session__new(&file, false, &eops);
870         if (!session) {
871                 pr_err("Initializing perf session failed\n");
872                 return -1;
873         }
874 
875         symbol__init(&session->header.env);
876 
877         if (!perf_session__has_traces(session, "lock record"))
878                 goto out_delete;
879 
880         if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
881                 pr_err("Initializing perf session tracepoint handlers failed\n");
882                 goto out_delete;
883         }
884 
885         if (select_key())
886                 goto out_delete;
887 
888         err = perf_session__process_events(session);
889         if (err)
890                 goto out_delete;
891 
892         setup_pager();
893         if (display_info) /* used for info subcommand */
894                 err = dump_info();
895         else {
896                 sort_result();
897                 print_result();
898         }
899 
900 out_delete:
901         perf_session__delete(session);
902         return err;
903 }
904 
905 static int __cmd_record(int argc, const char **argv)
906 {
907         const char *record_args[] = {
908                 "record", "-R", "-m", "1024", "-c", "1",
909         };
910         unsigned int rec_argc, i, j, ret;
911         const char **rec_argv;
912 
913         for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
914                 if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
915                                 pr_err("tracepoint %s is not enabled. "
916                                        "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
917                                        lock_tracepoints[i].name);
918                                 return 1;
919                 }
920         }
921 
922         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
923         /* factor of 2 is for -e in front of each tracepoint */
924         rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
925 
926         rec_argv = calloc(rec_argc + 1, sizeof(char *));
927         if (!rec_argv)
928                 return -ENOMEM;
929 
930         for (i = 0; i < ARRAY_SIZE(record_args); i++)
931                 rec_argv[i] = strdup(record_args[i]);
932 
933         for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
934                 rec_argv[i++] = "-e";
935                 rec_argv[i++] = strdup(lock_tracepoints[j].name);
936         }
937 
938         for (j = 1; j < (unsigned int)argc; j++, i++)
939                 rec_argv[i] = argv[j];
940 
941         BUG_ON(i != rec_argc);
942 
943         ret = cmd_record(i, rec_argv, NULL);
944         free(rec_argv);
945         return ret;
946 }
947 
948 int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
949 {
950         const struct option info_options[] = {
951         OPT_BOOLEAN('t', "threads", &info_threads,
952                     "dump thread list in perf.data"),
953         OPT_BOOLEAN('m', "map", &info_map,
954                     "map of lock instances (address:name table)"),
955         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
956         OPT_END()
957         };
958         const struct option lock_options[] = {
959         OPT_STRING('i', "input", &input_name, "file", "input file name"),
960         OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
961         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
962         OPT_END()
963         };
964         const struct option report_options[] = {
965         OPT_STRING('k', "key", &sort_key, "acquired",
966                     "key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"),
967         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
968         /* TODO: type */
969         OPT_END()
970         };
971         const char * const info_usage[] = {
972                 "perf lock info [<options>]",
973                 NULL
974         };
975         const char *const lock_subcommands[] = { "record", "report", "script",
976                                                  "info", NULL };
977         const char *lock_usage[] = {
978                 NULL,
979                 NULL
980         };
981         const char * const report_usage[] = {
982                 "perf lock report [<options>]",
983                 NULL
984         };
985         unsigned int i;
986         int rc = 0;
987 
988         for (i = 0; i < LOCKHASH_SIZE; i++)
989                 INIT_LIST_HEAD(lockhash_table + i);
990 
991         argc = parse_options_subcommand(argc, argv, lock_options, lock_subcommands,
992                                         lock_usage, PARSE_OPT_STOP_AT_NON_OPTION);
993         if (!argc)
994                 usage_with_options(lock_usage, lock_options);
995 
996         if (!strncmp(argv[0], "rec", 3)) {
997                 return __cmd_record(argc, argv);
998         } else if (!strncmp(argv[0], "report", 6)) {
999                 trace_handler = &report_lock_ops;
1000                 if (argc) {
1001                         argc = parse_options(argc, argv,
1002                                              report_options, report_usage, 0);
1003                         if (argc)
1004                                 usage_with_options(report_usage, report_options);
1005                 }
1006                 rc = __cmd_report(false);
1007         } else if (!strcmp(argv[0], "script")) {
1008                 /* Aliased to 'perf script' */
1009                 return cmd_script(argc, argv, prefix);
1010         } else if (!strcmp(argv[0], "info")) {
1011                 if (argc) {
1012                         argc = parse_options(argc, argv,
1013                                              info_options, info_usage, 0);
1014                         if (argc)
1015                                 usage_with_options(info_usage, info_options);
1016                 }
1017                 /* recycling report_lock_ops */
1018                 trace_handler = &report_lock_ops;
1019                 rc = __cmd_report(true);
1020         } else {
1021                 usage_with_options(lock_usage, lock_options);
1022         }
1023 
1024         return rc;
1025 }
1026 

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