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perf tools: Fix counter sample frequency breakage
[linux-2.6/libata-dev.git] / tools / perf / builtin-top.c
blobc0f69e80b2cca4de01410c786b627e2cf082ae28
1 /*
2 * builtin-top.c
3 *
4 * Builtin top command: Display a continuously updated profile of
5 * any workload, CPU or specific PID.
6 *
7 * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
8 *
9 * Improvements and fixes by:
10 *
11 * Arjan van de Ven <arjan@linux.intel.com>
12 * Yanmin Zhang <yanmin.zhang@intel.com>
13 * Wu Fengguang <fengguang.wu@intel.com>
14 * Mike Galbraith <efault@gmx.de>
15 * Paul Mackerras <paulus@samba.org>
16 *
17 * Released under the GPL v2. (and only v2, not any later version)
18 */
19 #include "builtin.h"
20
21 #include "perf.h"
22
23 #include "util/symbol.h"
24 #include "util/color.h"
25 #include "util/thread.h"
26 #include "util/util.h"
27 #include <linux/rbtree.h>
28 #include "util/parse-options.h"
29 #include "util/parse-events.h"
30
31 #include "util/debug.h"
32
33 #include <assert.h>
34 #include <fcntl.h>
35
36 #include <stdio.h>
37 #include <termios.h>
38 #include <unistd.h>
39
40 #include <errno.h>
41 #include <time.h>
42 #include <sched.h>
43 #include <pthread.h>
44
45 #include <sys/syscall.h>
46 #include <sys/ioctl.h>
47 #include <sys/poll.h>
48 #include <sys/prctl.h>
49 #include <sys/wait.h>
50 #include <sys/uio.h>
51 #include <sys/mman.h>
52
53 #include <linux/unistd.h>
54 #include <linux/types.h>
55
56 static int fd[MAX_NR_CPUS][MAX_COUNTERS];
57
58 static int system_wide = 0;
59
60 static int default_interval = 0;
61
62 static int count_filter = 5;
63 static int print_entries = 15;
64
65 static int target_pid = -1;
66 static int inherit = 0;
67 static int profile_cpu = -1;
68 static int nr_cpus = 0;
69 static unsigned int realtime_prio = 0;
70 static int group = 0;
71 static unsigned int page_size;
72 static unsigned int mmap_pages = 16;
73 static int freq = 1000; /* 1 KHz */
74
75 static int delay_secs = 2;
76 static int zero = 0;
77 static int dump_symtab = 0;
78
79 /*
80 * Source
81 */
82
83 struct source_line {
84 u64 eip;
85 unsigned long count[MAX_COUNTERS];
86 char *line;
87 struct source_line *next;
88 };
89
90 static char *sym_filter = NULL;
91 struct sym_entry *sym_filter_entry = NULL;
92 static int sym_pcnt_filter = 5;
93 static int sym_counter = 0;
94 static int display_weighted = -1;
95
96 /*
97 * Symbols
98 */
99
100 struct sym_entry {
101 struct rb_node rb_node;
102 struct list_head node;
103 unsigned long count[MAX_COUNTERS];
104 unsigned long snap_count;
105 double weight;
106 int skip;
107 struct map *map;
108 struct source_line *source;
109 struct source_line *lines;
110 struct source_line **lines_tail;
111 pthread_mutex_t source_lock;
112 };
113
114 /*
115 * Source functions
116 */
117
118 static void parse_source(struct sym_entry *syme)
119 {
120 struct symbol *sym;
121 struct map *map;
122 FILE *file;
123 char command[PATH_MAX*2];
124 const char *path;
125 u64 len;
126
127 if (!syme)
128 return;
129
130 if (syme->lines) {
131 pthread_mutex_lock(&syme->source_lock);
132 goto out_assign;
133 }
134
135 sym = (struct symbol *)(syme + 1);
136 map = syme->map;
137 path = map->dso->long_name;
138
139 len = sym->end - sym->start;
140
141 sprintf(command,
142 "objdump --start-address=0x%016Lx "
143 "--stop-address=0x%016Lx -dS %s",
144 sym->start, sym->end, path);
145
146 file = popen(command, "r");
147 if (!file)
148 return;
149
150 pthread_mutex_lock(&syme->source_lock);
151 syme->lines_tail = &syme->lines;
152 while (!feof(file)) {
153 struct source_line *src;
154 size_t dummy = 0;
155 char *c;
156
157 src = malloc(sizeof(struct source_line));
158 assert(src != NULL);
159 memset(src, 0, sizeof(struct source_line));
160
161 if (getline(&src->line, &dummy, file) < 0)
162 break;
163 if (!src->line)
164 break;
165
166 c = strchr(src->line, '\n');
167 if (c)
168 *c = 0;
169
170 src->next = NULL;
171 *syme->lines_tail = src;
172 syme->lines_tail = &src->next;
173
174 if (strlen(src->line)>8 && src->line[8] == ':') {
175 src->eip = strtoull(src->line, NULL, 16);
176 src->eip += map->start;
177 }
178 if (strlen(src->line)>8 && src->line[16] == ':') {
179 src->eip = strtoull(src->line, NULL, 16);
180 src->eip += map->start;
181 }
182 }
183 pclose(file);
184 out_assign:
185 sym_filter_entry = syme;
186 pthread_mutex_unlock(&syme->source_lock);
187 }
188
189 static void __zero_source_counters(struct sym_entry *syme)
190 {
191 int i;
192 struct source_line *line;
193
194 line = syme->lines;
195 while (line) {
196 for (i = 0; i < nr_counters; i++)
197 line->count[i] = 0;
198 line = line->next;
199 }
200 }
201
202 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
203 {
204 struct source_line *line;
205
206 if (syme != sym_filter_entry)
207 return;
208
209 if (pthread_mutex_trylock(&syme->source_lock))
210 return;
211
212 if (!syme->source)
213 goto out_unlock;
214
215 for (line = syme->lines; line; line = line->next) {
216 if (line->eip == ip) {
217 line->count[counter]++;
218 break;
219 }
220 if (line->eip > ip)
221 break;
222 }
223 out_unlock:
224 pthread_mutex_unlock(&syme->source_lock);
225 }
226
227 static void lookup_sym_source(struct sym_entry *syme)
228 {
229 struct symbol *symbol = (struct symbol *)(syme + 1);
230 struct source_line *line;
231 char pattern[PATH_MAX];
232
233 sprintf(pattern, "<%s>:", symbol->name);
234
235 pthread_mutex_lock(&syme->source_lock);
236 for (line = syme->lines; line; line = line->next) {
237 if (strstr(line->line, pattern)) {
238 syme->source = line;
239 break;
240 }
241 }
242 pthread_mutex_unlock(&syme->source_lock);
243 }
244
245 static void show_lines(struct source_line *queue, int count, int total)
246 {
247 int i;
248 struct source_line *line;
249
250 line = queue;
251 for (i = 0; i < count; i++) {
252 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
253
254 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
255 line = line->next;
256 }
257 }
258
259 #define TRACE_COUNT 3
260
261 static void show_details(struct sym_entry *syme)
262 {
263 struct symbol *symbol;
264 struct source_line *line;
265 struct source_line *line_queue = NULL;
266 int displayed = 0;
267 int line_queue_count = 0, total = 0, more = 0;
268
269 if (!syme)
270 return;
271
272 if (!syme->source)
273 lookup_sym_source(syme);
274
275 if (!syme->source)
276 return;
277
278 symbol = (struct symbol *)(syme + 1);
279 printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
280 printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
281
282 pthread_mutex_lock(&syme->source_lock);
283 line = syme->source;
284 while (line) {
285 total += line->count[sym_counter];
286 line = line->next;
287 }
288
289 line = syme->source;
290 while (line) {
291 float pcnt = 0.0;
292
293 if (!line_queue_count)
294 line_queue = line;
295 line_queue_count++;
296
297 if (line->count[sym_counter])
298 pcnt = 100.0 * line->count[sym_counter] / (float)total;
299 if (pcnt >= (float)sym_pcnt_filter) {
300 if (displayed <= print_entries)
301 show_lines(line_queue, line_queue_count, total);
302 else more++;
303 displayed += line_queue_count;
304 line_queue_count = 0;
305 line_queue = NULL;
306 } else if (line_queue_count > TRACE_COUNT) {
307 line_queue = line_queue->next;
308 line_queue_count--;
309 }
310
311 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
312 line = line->next;
313 }
314 pthread_mutex_unlock(&syme->source_lock);
315 if (more)
316 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
317 }
318
319 /*
320 * Symbols will be added here in record_ip and will get out
321 * after decayed.
322 */
323 static LIST_HEAD(active_symbols);
324 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
325
326 /*
327 * Ordering weight: count-1 * count-2 * ... / count-n
328 */
329 static double sym_weight(const struct sym_entry *sym)
330 {
331 double weight = sym->snap_count;
332 int counter;
333
334 if (!display_weighted)
335 return weight;
336
337 for (counter = 1; counter < nr_counters-1; counter++)
338 weight *= sym->count[counter];
339
340 weight /= (sym->count[counter] + 1);
341
342 return weight;
343 }
344
345 static long samples;
346 static long userspace_samples;
347 static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
348
349 static void __list_insert_active_sym(struct sym_entry *syme)
350 {
351 list_add(&syme->node, &active_symbols);
352 }
353
354 static void list_remove_active_sym(struct sym_entry *syme)
355 {
356 pthread_mutex_lock(&active_symbols_lock);
357 list_del_init(&syme->node);
358 pthread_mutex_unlock(&active_symbols_lock);
359 }
360
361 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
362 {
363 struct rb_node **p = &tree->rb_node;
364 struct rb_node *parent = NULL;
365 struct sym_entry *iter;
366
367 while (*p != NULL) {
368 parent = *p;
369 iter = rb_entry(parent, struct sym_entry, rb_node);
370
371 if (se->weight > iter->weight)
372 p = &(*p)->rb_left;
373 else
374 p = &(*p)->rb_right;
375 }
376
377 rb_link_node(&se->rb_node, parent, p);
378 rb_insert_color(&se->rb_node, tree);
379 }
380
381 static void print_sym_table(void)
382 {
383 int printed = 0, j;
384 int counter, snap = !display_weighted ? sym_counter : 0;
385 float samples_per_sec = samples/delay_secs;
386 float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
387 float sum_ksamples = 0.0;
388 struct sym_entry *syme, *n;
389 struct rb_root tmp = RB_ROOT;
390 struct rb_node *nd;
391
392 samples = userspace_samples = 0;
393
394 /* Sort the active symbols */
395 pthread_mutex_lock(&active_symbols_lock);
396 syme = list_entry(active_symbols.next, struct sym_entry, node);
397 pthread_mutex_unlock(&active_symbols_lock);
398
399 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
400 syme->snap_count = syme->count[snap];
401 if (syme->snap_count != 0) {
402 syme->weight = sym_weight(syme);
403 rb_insert_active_sym(&tmp, syme);
404 sum_ksamples += syme->snap_count;
405
406 for (j = 0; j < nr_counters; j++)
407 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
408 } else
409 list_remove_active_sym(syme);
410 }
411
412 puts(CONSOLE_CLEAR);
413
414 printf(
415 "------------------------------------------------------------------------------\n");
416 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
417 samples_per_sec,
418 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
419
420 if (nr_counters == 1 || !display_weighted) {
421 printf("%Ld", (u64)attrs[0].sample_period);
422 if (freq)
423 printf("Hz ");
424 else
425 printf(" ");
426 }
427
428 if (!display_weighted)
429 printf("%s", event_name(sym_counter));
430 else for (counter = 0; counter < nr_counters; counter++) {
431 if (counter)
432 printf("/");
433
434 printf("%s", event_name(counter));
435 }
436
437 printf( "], ");
438
439 if (target_pid != -1)
440 printf(" (target_pid: %d", target_pid);
441 else
442 printf(" (all");
443
444 if (profile_cpu != -1)
445 printf(", cpu: %d)\n", profile_cpu);
446 else {
447 if (target_pid != -1)
448 printf(")\n");
449 else
450 printf(", %d CPUs)\n", nr_cpus);
451 }
452
453 printf("------------------------------------------------------------------------------\n\n");
454
455 if (sym_filter_entry) {
456 show_details(sym_filter_entry);
457 return;
458 }
459
460 if (nr_counters == 1)
461 printf(" samples pcnt");
462 else
463 printf(" weight samples pcnt");
464
465 if (verbose)
466 printf(" RIP ");
467 printf(" kernel function\n");
468 printf(" %s _______ _____",
469 nr_counters == 1 ? " " : "______");
470 if (verbose)
471 printf(" ________________");
472 printf(" _______________\n\n");
473
474 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
475 struct symbol *sym;
476 double pcnt;
477
478 syme = rb_entry(nd, struct sym_entry, rb_node);
479 sym = (struct symbol *)(syme + 1);
480
481 if (++printed > print_entries || (int)syme->snap_count < count_filter)
482 continue;
483
484 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
485 sum_ksamples));
486
487 if (nr_counters == 1 || !display_weighted)
488 printf("%20.2f - ", syme->weight);
489 else
490 printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
491
492 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
493 if (verbose)
494 printf(" - %016llx", sym->start);
495 printf(" : %s", sym->name);
496 if (syme->map->dso->name[0] == '[')
497 printf(" \t%s", syme->map->dso->name);
498 printf("\n");
499 }
500 }
501
502 static void prompt_integer(int *target, const char *msg)
503 {
504 char *buf = malloc(0), *p;
505 size_t dummy = 0;
506 int tmp;
507
508 fprintf(stdout, "\n%s: ", msg);
509 if (getline(&buf, &dummy, stdin) < 0)
510 return;
511
512 p = strchr(buf, '\n');
513 if (p)
514 *p = 0;
515
516 p = buf;
517 while(*p) {
518 if (!isdigit(*p))
519 goto out_free;
520 p++;
521 }
522 tmp = strtoul(buf, NULL, 10);
523 *target = tmp;
524 out_free:
525 free(buf);
526 }
527
528 static void prompt_percent(int *target, const char *msg)
529 {
530 int tmp = 0;
531
532 prompt_integer(&tmp, msg);
533 if (tmp >= 0 && tmp <= 100)
534 *target = tmp;
535 }
536
537 static void prompt_symbol(struct sym_entry **target, const char *msg)
538 {
539 char *buf = malloc(0), *p;
540 struct sym_entry *syme = *target, *n, *found = NULL;
541 size_t dummy = 0;
542
543 /* zero counters of active symbol */
544 if (syme) {
545 pthread_mutex_lock(&syme->source_lock);
546 __zero_source_counters(syme);
547 *target = NULL;
548 pthread_mutex_unlock(&syme->source_lock);
549 }
550
551 fprintf(stdout, "\n%s: ", msg);
552 if (getline(&buf, &dummy, stdin) < 0)
553 goto out_free;
554
555 p = strchr(buf, '\n');
556 if (p)
557 *p = 0;
558
559 pthread_mutex_lock(&active_symbols_lock);
560 syme = list_entry(active_symbols.next, struct sym_entry, node);
561 pthread_mutex_unlock(&active_symbols_lock);
562
563 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
564 struct symbol *sym = (struct symbol *)(syme + 1);
565
566 if (!strcmp(buf, sym->name)) {
567 found = syme;
568 break;
569 }
570 }
571
572 if (!found) {
573 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
574 sleep(1);
575 return;
576 } else
577 parse_source(found);
578
579 out_free:
580 free(buf);
581 }
582
583 static void print_mapped_keys(void)
584 {
585 char *name = NULL;
586
587 if (sym_filter_entry) {
588 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
589 name = sym->name;
590 }
591
592 fprintf(stdout, "\nMapped keys:\n");
593 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs);
594 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries);
595
596 if (nr_counters > 1)
597 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
598
599 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
600
601 if (vmlinux_name) {
602 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
603 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
604 fprintf(stdout, "\t[S] stop annotation.\n");
605 }
606
607 if (nr_counters > 1)
608 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
609
610 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
611 fprintf(stdout, "\t[qQ] quit.\n");
612 }
613
614 static int key_mapped(int c)
615 {
616 switch (c) {
617 case 'd':
618 case 'e':
619 case 'f':
620 case 'z':
621 case 'q':
622 case 'Q':
623 return 1;
624 case 'E':
625 case 'w':
626 return nr_counters > 1 ? 1 : 0;
627 case 'F':
628 case 's':
629 case 'S':
630 return vmlinux_name ? 1 : 0;
631 default:
632 break;
633 }
634
635 return 0;
636 }
637
638 static void handle_keypress(int c)
639 {
640 if (!key_mapped(c)) {
641 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
642 struct termios tc, save;
643
644 print_mapped_keys();
645 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
646 fflush(stdout);
647
648 tcgetattr(0, &save);
649 tc = save;
650 tc.c_lflag &= ~(ICANON | ECHO);
651 tc.c_cc[VMIN] = 0;
652 tc.c_cc[VTIME] = 0;
653 tcsetattr(0, TCSANOW, &tc);
654
655 poll(&stdin_poll, 1, -1);
656 c = getc(stdin);
657
658 tcsetattr(0, TCSAFLUSH, &save);
659 if (!key_mapped(c))
660 return;
661 }
662
663 switch (c) {
664 case 'd':
665 prompt_integer(&delay_secs, "Enter display delay");
666 break;
667 case 'e':
668 prompt_integer(&print_entries, "Enter display entries (lines)");
669 break;
670 case 'E':
671 if (nr_counters > 1) {
672 int i;
673
674 fprintf(stderr, "\nAvailable events:");
675 for (i = 0; i < nr_counters; i++)
676 fprintf(stderr, "\n\t%d %s", i, event_name(i));
677
678 prompt_integer(&sym_counter, "Enter details event counter");
679
680 if (sym_counter >= nr_counters) {
681 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
682 sym_counter = 0;
683 sleep(1);
684 }
685 } else sym_counter = 0;
686 break;
687 case 'f':
688 prompt_integer(&count_filter, "Enter display event count filter");
689 break;
690 case 'F':
691 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
692 break;
693 case 'q':
694 case 'Q':
695 printf("exiting.\n");
696 exit(0);
697 case 's':
698 prompt_symbol(&sym_filter_entry, "Enter details symbol");
699 break;
700 case 'S':
701 if (!sym_filter_entry)
702 break;
703 else {
704 struct sym_entry *syme = sym_filter_entry;
705
706 pthread_mutex_lock(&syme->source_lock);
707 sym_filter_entry = NULL;
708 __zero_source_counters(syme);
709 pthread_mutex_unlock(&syme->source_lock);
710 }
711 break;
712 case 'w':
713 display_weighted = ~display_weighted;
714 break;
715 case 'z':
716 zero = ~zero;
717 break;
718 default:
719 break;
720 }
721 }
722
723 static void *display_thread(void *arg __used)
724 {
725 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
726 struct termios tc, save;
727 int delay_msecs, c;
728
729 tcgetattr(0, &save);
730 tc = save;
731 tc.c_lflag &= ~(ICANON | ECHO);
732 tc.c_cc[VMIN] = 0;
733 tc.c_cc[VTIME] = 0;
734
735 repeat:
736 delay_msecs = delay_secs * 1000;
737 tcsetattr(0, TCSANOW, &tc);
738 /* trash return*/
739 getc(stdin);
740
741 do {
742 print_sym_table();
743 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
744
745 c = getc(stdin);
746 tcsetattr(0, TCSAFLUSH, &save);
747
748 handle_keypress(c);
749 goto repeat;
750
751 return NULL;
752 }
753
754 /* Tag samples to be skipped. */
755 static const char *skip_symbols[] = {
756 "default_idle",
757 "cpu_idle",
758 "enter_idle",
759 "exit_idle",
760 "mwait_idle",
761 "mwait_idle_with_hints",
762 "poll_idle",
763 "ppc64_runlatch_off",
764 "pseries_dedicated_idle_sleep",
765 NULL
766 };
767
768 static int symbol_filter(struct map *map, struct symbol *sym)
769 {
770 struct sym_entry *syme;
771 const char *name = sym->name;
772 int i;
773
774 /*
775 * ppc64 uses function descriptors and appends a '.' to the
776 * start of every instruction address. Remove it.
777 */
778 if (name[0] == '.')
779 name++;
780
781 if (!strcmp(name, "_text") ||
782 !strcmp(name, "_etext") ||
783 !strcmp(name, "_sinittext") ||
784 !strncmp("init_module", name, 11) ||
785 !strncmp("cleanup_module", name, 14) ||
786 strstr(name, "_text_start") ||
787 strstr(name, "_text_end"))
788 return 1;
789
790 syme = dso__sym_priv(map->dso, sym);
791 syme->map = map;
792 pthread_mutex_init(&syme->source_lock, NULL);
793 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
794 sym_filter_entry = syme;
795
796 for (i = 0; skip_symbols[i]; i++) {
797 if (!strcmp(skip_symbols[i], name)) {
798 syme->skip = 1;
799 break;
800 }
801 }
802
803 return 0;
804 }
805
806 static int parse_symbols(void)
807 {
808 if (dsos__load_kernel(vmlinux_name, sizeof(struct sym_entry),
809 symbol_filter, verbose, 1) <= 0)
810 return -1;
811
812 if (dump_symtab)
813 dsos__fprintf(stderr);
814
815 return 0;
816 }
817
818 /*
819 * Binary search in the histogram table and record the hit:
820 */
821 static void record_ip(u64 ip, int counter)
822 {
823 struct map *map;
824 struct symbol *sym = kernel_maps__find_symbol(ip, &map);
825
826 if (sym != NULL) {
827 struct sym_entry *syme = dso__sym_priv(map->dso, sym);
828
829 if (!syme->skip) {
830 syme->count[counter]++;
831 record_precise_ip(syme, counter, ip);
832 pthread_mutex_lock(&active_symbols_lock);
833 if (list_empty(&syme->node) || !syme->node.next)
834 __list_insert_active_sym(syme);
835 pthread_mutex_unlock(&active_symbols_lock);
836 return;
837 }
838 }
839
840 samples--;
841 }
842
843 static void process_event(u64 ip, int counter, int user)
844 {
845 samples++;
846
847 if (user) {
848 userspace_samples++;
849 return;
850 }
851
852 record_ip(ip, counter);
853 }
854
855 struct mmap_data {
856 int counter;
857 void *base;
858 int mask;
859 unsigned int prev;
860 };
861
862 static unsigned int mmap_read_head(struct mmap_data *md)
863 {
864 struct perf_event_mmap_page *pc = md->base;
865 int head;
866
867 head = pc->data_head;
868 rmb();
869
870 return head;
871 }
872
873 struct timeval last_read, this_read;
874
875 static void mmap_read_counter(struct mmap_data *md)
876 {
877 unsigned int head = mmap_read_head(md);
878 unsigned int old = md->prev;
879 unsigned char *data = md->base + page_size;
880 int diff;
881
882 gettimeofday(&this_read, NULL);
883
884 /*
885 * If we're further behind than half the buffer, there's a chance
886 * the writer will bite our tail and mess up the samples under us.
887 *
888 * If we somehow ended up ahead of the head, we got messed up.
889 *
890 * In either case, truncate and restart at head.
891 */
892 diff = head - old;
893 if (diff > md->mask / 2 || diff < 0) {
894 struct timeval iv;
895 unsigned long msecs;
896
897 timersub(&this_read, &last_read, &iv);
898 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
899
900 fprintf(stderr, "WARNING: failed to keep up with mmap data."
901 " Last read %lu msecs ago.\n", msecs);
902
903 /*
904 * head points to a known good entry, start there.
905 */
906 old = head;
907 }
908
909 last_read = this_read;
910
911 for (; old != head;) {
912 event_t *event = (event_t *)&data[old & md->mask];
913
914 event_t event_copy;
915
916 size_t size = event->header.size;
917
918 /*
919 * Event straddles the mmap boundary -- header should always
920 * be inside due to u64 alignment of output.
921 */
922 if ((old & md->mask) + size != ((old + size) & md->mask)) {
923 unsigned int offset = old;
924 unsigned int len = min(sizeof(*event), size), cpy;
925 void *dst = &event_copy;
926
927 do {
928 cpy = min(md->mask + 1 - (offset & md->mask), len);
929 memcpy(dst, &data[offset & md->mask], cpy);
930 offset += cpy;
931 dst += cpy;
932 len -= cpy;
933 } while (len);
934
935 event = &event_copy;
936 }
937
938 old += size;
939
940 if (event->header.type == PERF_RECORD_SAMPLE) {
941 int user =
942 (event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
943 process_event(event->ip.ip, md->counter, user);
944 }
945 }
946
947 md->prev = old;
948 }
949
950 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
951 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
952
953 static void mmap_read(void)
954 {
955 int i, counter;
956
957 for (i = 0; i < nr_cpus; i++) {
958 for (counter = 0; counter < nr_counters; counter++)
959 mmap_read_counter(&mmap_array[i][counter]);
960 }
961 }
962
963 int nr_poll;
964 int group_fd;
965
966 static void start_counter(int i, int counter)
967 {
968 struct perf_event_attr *attr;
969 int cpu;
970
971 cpu = profile_cpu;
972 if (target_pid == -1 && profile_cpu == -1)
973 cpu = i;
974
975 attr = attrs + counter;
976
977 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
978
979 if (freq) {
980 attr->sample_type |= PERF_SAMPLE_PERIOD;
981 attr->freq = 1;
982 attr->sample_freq = freq;
983 }
984
985 attr->inherit = (cpu < 0) && inherit;
986
987 try_again:
988 fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
989
990 if (fd[i][counter] < 0) {
991 int err = errno;
992
993 if (err == EPERM)
994 die("No permission - are you root?\n");
995 /*
996 * If it's cycles then fall back to hrtimer
997 * based cpu-clock-tick sw counter, which
998 * is always available even if no PMU support:
999 */
1000 if (attr->type == PERF_TYPE_HARDWARE
1001 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1002
1003 if (verbose)
1004 warning(" ... trying to fall back to cpu-clock-ticks\n");
1005
1006 attr->type = PERF_TYPE_SOFTWARE;
1007 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1008 goto try_again;
1009 }
1010 printf("\n");
1011 error("perfcounter syscall returned with %d (%s)\n",
1012 fd[i][counter], strerror(err));
1013 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1014 exit(-1);
1015 }
1016 assert(fd[i][counter] >= 0);
1017 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1018
1019 /*
1020 * First counter acts as the group leader:
1021 */
1022 if (group && group_fd == -1)
1023 group_fd = fd[i][counter];
1024
1025 event_array[nr_poll].fd = fd[i][counter];
1026 event_array[nr_poll].events = POLLIN;
1027 nr_poll++;
1028
1029 mmap_array[i][counter].counter = counter;
1030 mmap_array[i][counter].prev = 0;
1031 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1032 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1033 PROT_READ, MAP_SHARED, fd[i][counter], 0);
1034 if (mmap_array[i][counter].base == MAP_FAILED)
1035 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1036 }
1037
1038 static int __cmd_top(void)
1039 {
1040 pthread_t thread;
1041 int i, counter;
1042 int ret;
1043
1044 for (i = 0; i < nr_cpus; i++) {
1045 group_fd = -1;
1046 for (counter = 0; counter < nr_counters; counter++)
1047 start_counter(i, counter);
1048 }
1049
1050 /* Wait for a minimal set of events before starting the snapshot */
1051 poll(event_array, nr_poll, 100);
1052
1053 mmap_read();
1054
1055 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1056 printf("Could not create display thread.\n");
1057 exit(-1);
1058 }
1059
1060 if (realtime_prio) {
1061 struct sched_param param;
1062
1063 param.sched_priority = realtime_prio;
1064 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1065 printf("Could not set realtime priority.\n");
1066 exit(-1);
1067 }
1068 }
1069
1070 while (1) {
1071 int hits = samples;
1072
1073 mmap_read();
1074
1075 if (hits == samples)
1076 ret = poll(event_array, nr_poll, 100);
1077 }
1078
1079 return 0;
1080 }
1081
1082 static const char * const top_usage[] = {
1083 "perf top [<options>]",
1084 NULL
1085 };
1086
1087 static const struct option options[] = {
1088 OPT_CALLBACK('e', "event", NULL, "event",
1089 "event selector. use 'perf list' to list available events",
1090 parse_events),
1091 OPT_INTEGER('c', "count", &default_interval,
1092 "event period to sample"),
1093 OPT_INTEGER('p', "pid", &target_pid,
1094 "profile events on existing pid"),
1095 OPT_BOOLEAN('a', "all-cpus", &system_wide,
1096 "system-wide collection from all CPUs"),
1097 OPT_INTEGER('C', "CPU", &profile_cpu,
1098 "CPU to profile on"),
1099 OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
1100 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1101 "number of mmap data pages"),
1102 OPT_INTEGER('r', "realtime", &realtime_prio,
1103 "collect data with this RT SCHED_FIFO priority"),
1104 OPT_INTEGER('d', "delay", &delay_secs,
1105 "number of seconds to delay between refreshes"),
1106 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1107 "dump the symbol table used for profiling"),
1108 OPT_INTEGER('f', "count-filter", &count_filter,
1109 "only display functions with more events than this"),
1110 OPT_BOOLEAN('g', "group", &group,
1111 "put the counters into a counter group"),
1112 OPT_BOOLEAN('i', "inherit", &inherit,
1113 "child tasks inherit counters"),
1114 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1115 "symbol to annotate - requires -k option"),
1116 OPT_BOOLEAN('z', "zero", &zero,
1117 "zero history across updates"),
1118 OPT_INTEGER('F', "freq", &freq,
1119 "profile at this frequency"),
1120 OPT_INTEGER('E', "entries", &print_entries,
1121 "display this many functions"),
1122 OPT_BOOLEAN('v', "verbose", &verbose,
1123 "be more verbose (show counter open errors, etc)"),
1124 OPT_END()
1125 };
1126
1127 int cmd_top(int argc, const char **argv, const char *prefix __used)
1128 {
1129 int counter;
1130
1131 symbol__init();
1132
1133 page_size = sysconf(_SC_PAGE_SIZE);
1134
1135 argc = parse_options(argc, argv, options, top_usage, 0);
1136 if (argc)
1137 usage_with_options(top_usage, options);
1138
1139 /* CPU and PID are mutually exclusive */
1140 if (target_pid != -1 && profile_cpu != -1) {
1141 printf("WARNING: PID switch overriding CPU\n");
1142 sleep(1);
1143 profile_cpu = -1;
1144 }
1145
1146 if (!nr_counters)
1147 nr_counters = 1;
1148
1149 if (delay_secs < 1)
1150 delay_secs = 1;
1151
1152 parse_symbols();
1153 parse_source(sym_filter_entry);
1154
1155
1156 /*
1157 * User specified count overrides default frequency.
1158 */
1159 if (default_interval)
1160 freq = 0;
1161 else if (freq) {
1162 default_interval = freq;
1163 } else {
1164 fprintf(stderr, "frequency and count are zero, aborting\n");
1165 exit(EXIT_FAILURE);
1166 }
1167
1168 /*
1169 * Fill in the ones not specifically initialized via -c:
1170 */
1171 for (counter = 0; counter < nr_counters; counter++) {
1172 if (attrs[counter].sample_period)
1173 continue;
1174
1175 attrs[counter].sample_period = default_interval;
1176 }
1177
1178 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1179 assert(nr_cpus <= MAX_NR_CPUS);
1180 assert(nr_cpus >= 0);
1181
1182 if (target_pid != -1 || profile_cpu != -1)
1183 nr_cpus = 1;
1184
1185 return __cmd_top();
1186 }
Linux 2.6 libata-dev (mirror)