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Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / tools / perf / builtin-lock.c
blobc852c7a85d3236e86781b15616858a76b56c6206
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 #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 };
773 }
774
775 static void dump_map(void)
776 {
777 unsigned int i;
778 struct lock_stat *st;
779
780 pr_info("Address of instance: name of class\n");
781 for (i = 0; i < LOCKHASH_SIZE; i++) {
782 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
783 pr_info(" %p: %s\n", st->addr, st->name);
784 }
785 }
786 }
787
788 static int dump_info(void)
789 {
790 int rc = 0;
791
792 if (info_threads)
793 dump_threads();
794 else if (info_map)
795 dump_map();
796 else {
797 rc = -1;
798 pr_err("Unknown type of information\n");
799 }
800
801 return rc;
802 }
803
804 typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
805 struct perf_sample *sample);
806
807 static int process_sample_event(struct perf_tool *tool __maybe_unused,
808 union perf_event *event,
809 struct perf_sample *sample,
810 struct perf_evsel *evsel,
811 struct machine *machine)
812 {
813 struct thread *thread = machine__findnew_thread(machine, sample->pid,
814 sample->tid);
815
816 if (thread == NULL) {
817 pr_debug("problem processing %d event, skipping it.\n",
818 event->header.type);
819 return -1;
820 }
821
822 if (evsel->handler != NULL) {
823 tracepoint_handler f = evsel->handler;
824 return f(evsel, sample);
825 }
826
827 return 0;
828 }
829
830 static void sort_result(void)
831 {
832 unsigned int i;
833 struct lock_stat *st;
834
835 for (i = 0; i < LOCKHASH_SIZE; i++) {
836 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
837 insert_to_result(st, compare);
838 }
839 }
840 }
841
842 static const struct perf_evsel_str_handler lock_tracepoints[] = {
843 { "lock:lock_acquire", perf_evsel__process_lock_acquire, }, /* CONFIG_LOCKDEP */
844 { "lock:lock_acquired", perf_evsel__process_lock_acquired, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
845 { "lock:lock_contended", perf_evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
846 { "lock:lock_release", perf_evsel__process_lock_release, }, /* CONFIG_LOCKDEP */
847 };
848
849 static int __cmd_report(bool display_info)
850 {
851 int err = -EINVAL;
852 struct perf_tool eops = {
853 .sample = process_sample_event,
854 .comm = perf_event__process_comm,
855 .ordered_samples = true,
856 };
857 struct perf_data_file file = {
858 .path = input_name,
859 .mode = PERF_DATA_MODE_READ,
860 };
861
862 session = perf_session__new(&file, false, &eops);
863 if (!session) {
864 pr_err("Initializing perf session failed\n");
865 return -ENOMEM;
866 }
867
868 if (!perf_session__has_traces(session, "lock record"))
869 goto out_delete;
870
871 if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
872 pr_err("Initializing perf session tracepoint handlers failed\n");
873 goto out_delete;
874 }
875
876 if (select_key())
877 goto out_delete;
878
879 err = perf_session__process_events(session, &eops);
880 if (err)
881 goto out_delete;
882
883 setup_pager();
884 if (display_info) /* used for info subcommand */
885 err = dump_info();
886 else {
887 sort_result();
888 print_result();
889 }
890
891 out_delete:
892 perf_session__delete(session);
893 return err;
894 }
895
896 static int __cmd_record(int argc, const char **argv)
897 {
898 const char *record_args[] = {
899 "record", "-R", "-m", "1024", "-c", "1",
900 };
901 unsigned int rec_argc, i, j, ret;
902 const char **rec_argv;
903
904 for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
905 if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
906 pr_err("tracepoint %s is not enabled. "
907 "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
908 lock_tracepoints[i].name);
909 return 1;
910 }
911 }
912
913 rec_argc = ARRAY_SIZE(record_args) + argc - 1;
914 /* factor of 2 is for -e in front of each tracepoint */
915 rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
916
917 rec_argv = calloc(rec_argc + 1, sizeof(char *));
918 if (!rec_argv)
919 return -ENOMEM;
920
921 for (i = 0; i < ARRAY_SIZE(record_args); i++)
922 rec_argv[i] = strdup(record_args[i]);
923
924 for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
925 rec_argv[i++] = "-e";
926 rec_argv[i++] = strdup(lock_tracepoints[j].name);
927 }
928
929 for (j = 1; j < (unsigned int)argc; j++, i++)
930 rec_argv[i] = argv[j];
931
932 BUG_ON(i != rec_argc);
933
934 ret = cmd_record(i, rec_argv, NULL);
935 free(rec_argv);
936 return ret;
937 }
938
939 int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
940 {
941 const struct option info_options[] = {
942 OPT_BOOLEAN('t', "threads", &info_threads,
943 "dump thread list in perf.data"),
944 OPT_BOOLEAN('m', "map", &info_map,
945 "map of lock instances (address:name table)"),
946 OPT_END()
947 };
948 const struct option lock_options[] = {
949 OPT_STRING('i', "input", &input_name, "file", "input file name"),
950 OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
951 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
952 OPT_END()
953 };
954 const struct option report_options[] = {
955 OPT_STRING('k', "key", &sort_key, "acquired",
956 "key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"),
957 /* TODO: type */
958 OPT_END()
959 };
960 const char * const info_usage[] = {
961 "perf lock info [<options>]",
962 NULL
963 };
964 const char * const lock_usage[] = {
965 "perf lock [<options>] {record|report|script|info}",
966 NULL
967 };
968 const char * const report_usage[] = {
969 "perf lock report [<options>]",
970 NULL
971 };
972 unsigned int i;
973 int rc = 0;
974
975 symbol__init();
976 for (i = 0; i < LOCKHASH_SIZE; i++)
977 INIT_LIST_HEAD(lockhash_table + i);
978
979 argc = parse_options(argc, argv, lock_options, lock_usage,
980 PARSE_OPT_STOP_AT_NON_OPTION);
981 if (!argc)
982 usage_with_options(lock_usage, lock_options);
983
984 if (!strncmp(argv[0], "rec", 3)) {
985 return __cmd_record(argc, argv);
986 } else if (!strncmp(argv[0], "report", 6)) {
987 trace_handler = &report_lock_ops;
988 if (argc) {
989 argc = parse_options(argc, argv,
990 report_options, report_usage, 0);
991 if (argc)
992 usage_with_options(report_usage, report_options);
993 }
994 rc = __cmd_report(false);
995 } else if (!strcmp(argv[0], "script")) {
996 /* Aliased to 'perf script' */
997 return cmd_script(argc, argv, prefix);
998 } else if (!strcmp(argv[0], "info")) {
999 if (argc) {
1000 argc = parse_options(argc, argv,
1001 info_options, info_usage, 0);
1002 if (argc)
1003 usage_with_options(info_usage, info_options);
1004 }
1005 /* recycling report_lock_ops */
1006 trace_handler = &report_lock_ops;
1007 rc = __cmd_report(true);
1008 } else {
1009 usage_with_options(lock_usage, lock_options);
1010 }
1011
1012 return rc;
1013 }
Linus' kernel tree