?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
perf tools: Unify debug messages mechanisms
[linux-2.6/x86.git] / tools / perf / builtin-top.c
blob4a9fe228be2aa8e4b7b1d71bf857a7a8c7b6732c
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 map->unmap_ip(map, sym->start),
145 map->unmap_ip(map, sym->end), path);
146
147 file = popen(command, "r");
148 if (!file)
149 return;
150
151 pthread_mutex_lock(&syme->source_lock);
152 syme->lines_tail = &syme->lines;
153 while (!feof(file)) {
154 struct source_line *src;
155 size_t dummy = 0;
156 char *c;
157
158 src = malloc(sizeof(struct source_line));
159 assert(src != NULL);
160 memset(src, 0, sizeof(struct source_line));
161
162 if (getline(&src->line, &dummy, file) < 0)
163 break;
164 if (!src->line)
165 break;
166
167 c = strchr(src->line, '\n');
168 if (c)
169 *c = 0;
170
171 src->next = NULL;
172 *syme->lines_tail = src;
173 syme->lines_tail = &src->next;
174
175 if (strlen(src->line)>8 && src->line[8] == ':') {
176 src->eip = strtoull(src->line, NULL, 16);
177 src->eip = map->unmap_ip(map, src->eip);
178 }
179 if (strlen(src->line)>8 && src->line[16] == ':') {
180 src->eip = strtoull(src->line, NULL, 16);
181 src->eip = map->unmap_ip(map, src->eip);
182 }
183 }
184 pclose(file);
185 out_assign:
186 sym_filter_entry = syme;
187 pthread_mutex_unlock(&syme->source_lock);
188 }
189
190 static void __zero_source_counters(struct sym_entry *syme)
191 {
192 int i;
193 struct source_line *line;
194
195 line = syme->lines;
196 while (line) {
197 for (i = 0; i < nr_counters; i++)
198 line->count[i] = 0;
199 line = line->next;
200 }
201 }
202
203 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
204 {
205 struct source_line *line;
206
207 if (syme != sym_filter_entry)
208 return;
209
210 if (pthread_mutex_trylock(&syme->source_lock))
211 return;
212
213 if (!syme->source)
214 goto out_unlock;
215
216 for (line = syme->lines; line; line = line->next) {
217 if (line->eip == ip) {
218 line->count[counter]++;
219 break;
220 }
221 if (line->eip > ip)
222 break;
223 }
224 out_unlock:
225 pthread_mutex_unlock(&syme->source_lock);
226 }
227
228 static void lookup_sym_source(struct sym_entry *syme)
229 {
230 struct symbol *symbol = (struct symbol *)(syme + 1);
231 struct source_line *line;
232 char pattern[PATH_MAX];
233
234 sprintf(pattern, "<%s>:", symbol->name);
235
236 pthread_mutex_lock(&syme->source_lock);
237 for (line = syme->lines; line; line = line->next) {
238 if (strstr(line->line, pattern)) {
239 syme->source = line;
240 break;
241 }
242 }
243 pthread_mutex_unlock(&syme->source_lock);
244 }
245
246 static void show_lines(struct source_line *queue, int count, int total)
247 {
248 int i;
249 struct source_line *line;
250
251 line = queue;
252 for (i = 0; i < count; i++) {
253 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
254
255 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
256 line = line->next;
257 }
258 }
259
260 #define TRACE_COUNT 3
261
262 static void show_details(struct sym_entry *syme)
263 {
264 struct symbol *symbol;
265 struct source_line *line;
266 struct source_line *line_queue = NULL;
267 int displayed = 0;
268 int line_queue_count = 0, total = 0, more = 0;
269
270 if (!syme)
271 return;
272
273 if (!syme->source)
274 lookup_sym_source(syme);
275
276 if (!syme->source)
277 return;
278
279 symbol = (struct symbol *)(syme + 1);
280 printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
281 printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
282
283 pthread_mutex_lock(&syme->source_lock);
284 line = syme->source;
285 while (line) {
286 total += line->count[sym_counter];
287 line = line->next;
288 }
289
290 line = syme->source;
291 while (line) {
292 float pcnt = 0.0;
293
294 if (!line_queue_count)
295 line_queue = line;
296 line_queue_count++;
297
298 if (line->count[sym_counter])
299 pcnt = 100.0 * line->count[sym_counter] / (float)total;
300 if (pcnt >= (float)sym_pcnt_filter) {
301 if (displayed <= print_entries)
302 show_lines(line_queue, line_queue_count, total);
303 else more++;
304 displayed += line_queue_count;
305 line_queue_count = 0;
306 line_queue = NULL;
307 } else if (line_queue_count > TRACE_COUNT) {
308 line_queue = line_queue->next;
309 line_queue_count--;
310 }
311
312 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
313 line = line->next;
314 }
315 pthread_mutex_unlock(&syme->source_lock);
316 if (more)
317 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
318 }
319
320 /*
321 * Symbols will be added here in record_ip and will get out
322 * after decayed.
323 */
324 static LIST_HEAD(active_symbols);
325 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
326
327 /*
328 * Ordering weight: count-1 * count-2 * ... / count-n
329 */
330 static double sym_weight(const struct sym_entry *sym)
331 {
332 double weight = sym->snap_count;
333 int counter;
334
335 if (!display_weighted)
336 return weight;
337
338 for (counter = 1; counter < nr_counters-1; counter++)
339 weight *= sym->count[counter];
340
341 weight /= (sym->count[counter] + 1);
342
343 return weight;
344 }
345
346 static long samples;
347 static long userspace_samples;
348 static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
349
350 static void __list_insert_active_sym(struct sym_entry *syme)
351 {
352 list_add(&syme->node, &active_symbols);
353 }
354
355 static void list_remove_active_sym(struct sym_entry *syme)
356 {
357 pthread_mutex_lock(&active_symbols_lock);
358 list_del_init(&syme->node);
359 pthread_mutex_unlock(&active_symbols_lock);
360 }
361
362 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
363 {
364 struct rb_node **p = &tree->rb_node;
365 struct rb_node *parent = NULL;
366 struct sym_entry *iter;
367
368 while (*p != NULL) {
369 parent = *p;
370 iter = rb_entry(parent, struct sym_entry, rb_node);
371
372 if (se->weight > iter->weight)
373 p = &(*p)->rb_left;
374 else
375 p = &(*p)->rb_right;
376 }
377
378 rb_link_node(&se->rb_node, parent, p);
379 rb_insert_color(&se->rb_node, tree);
380 }
381
382 static void print_sym_table(void)
383 {
384 int printed = 0, j;
385 int counter, snap = !display_weighted ? sym_counter : 0;
386 float samples_per_sec = samples/delay_secs;
387 float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
388 float sum_ksamples = 0.0;
389 struct sym_entry *syme, *n;
390 struct rb_root tmp = RB_ROOT;
391 struct rb_node *nd;
392
393 samples = userspace_samples = 0;
394
395 /* Sort the active symbols */
396 pthread_mutex_lock(&active_symbols_lock);
397 syme = list_entry(active_symbols.next, struct sym_entry, node);
398 pthread_mutex_unlock(&active_symbols_lock);
399
400 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
401 syme->snap_count = syme->count[snap];
402 if (syme->snap_count != 0) {
403 syme->weight = sym_weight(syme);
404 rb_insert_active_sym(&tmp, syme);
405 sum_ksamples += syme->snap_count;
406
407 for (j = 0; j < nr_counters; j++)
408 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
409 } else
410 list_remove_active_sym(syme);
411 }
412
413 puts(CONSOLE_CLEAR);
414
415 printf(
416 "------------------------------------------------------------------------------\n");
417 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
418 samples_per_sec,
419 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
420
421 if (nr_counters == 1 || !display_weighted) {
422 printf("%Ld", (u64)attrs[0].sample_period);
423 if (freq)
424 printf("Hz ");
425 else
426 printf(" ");
427 }
428
429 if (!display_weighted)
430 printf("%s", event_name(sym_counter));
431 else for (counter = 0; counter < nr_counters; counter++) {
432 if (counter)
433 printf("/");
434
435 printf("%s", event_name(counter));
436 }
437
438 printf( "], ");
439
440 if (target_pid != -1)
441 printf(" (target_pid: %d", target_pid);
442 else
443 printf(" (all");
444
445 if (profile_cpu != -1)
446 printf(", cpu: %d)\n", profile_cpu);
447 else {
448 if (target_pid != -1)
449 printf(")\n");
450 else
451 printf(", %d CPUs)\n", nr_cpus);
452 }
453
454 printf("------------------------------------------------------------------------------\n\n");
455
456 if (sym_filter_entry) {
457 show_details(sym_filter_entry);
458 return;
459 }
460
461 if (nr_counters == 1)
462 printf(" samples pcnt");
463 else
464 printf(" weight samples pcnt");
465
466 if (verbose)
467 printf(" RIP ");
468 printf(" kernel function\n");
469 printf(" %s _______ _____",
470 nr_counters == 1 ? " " : "______");
471 if (verbose)
472 printf(" ________________");
473 printf(" _______________\n\n");
474
475 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
476 struct symbol *sym;
477 double pcnt;
478
479 syme = rb_entry(nd, struct sym_entry, rb_node);
480 sym = (struct symbol *)(syme + 1);
481
482 if (++printed > print_entries || (int)syme->snap_count < count_filter)
483 continue;
484
485 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
486 sum_ksamples));
487
488 if (nr_counters == 1 || !display_weighted)
489 printf("%20.2f - ", syme->weight);
490 else
491 printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
492
493 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
494 if (verbose)
495 printf(" - %016llx", sym->start);
496 printf(" : %s", sym->name);
497 if (syme->map->dso->name[0] == '[')
498 printf(" \t%s", syme->map->dso->name);
499 printf("\n");
500 }
501 }
502
503 static void prompt_integer(int *target, const char *msg)
504 {
505 char *buf = malloc(0), *p;
506 size_t dummy = 0;
507 int tmp;
508
509 fprintf(stdout, "\n%s: ", msg);
510 if (getline(&buf, &dummy, stdin) < 0)
511 return;
512
513 p = strchr(buf, '\n');
514 if (p)
515 *p = 0;
516
517 p = buf;
518 while(*p) {
519 if (!isdigit(*p))
520 goto out_free;
521 p++;
522 }
523 tmp = strtoul(buf, NULL, 10);
524 *target = tmp;
525 out_free:
526 free(buf);
527 }
528
529 static void prompt_percent(int *target, const char *msg)
530 {
531 int tmp = 0;
532
533 prompt_integer(&tmp, msg);
534 if (tmp >= 0 && tmp <= 100)
535 *target = tmp;
536 }
537
538 static void prompt_symbol(struct sym_entry **target, const char *msg)
539 {
540 char *buf = malloc(0), *p;
541 struct sym_entry *syme = *target, *n, *found = NULL;
542 size_t dummy = 0;
543
544 /* zero counters of active symbol */
545 if (syme) {
546 pthread_mutex_lock(&syme->source_lock);
547 __zero_source_counters(syme);
548 *target = NULL;
549 pthread_mutex_unlock(&syme->source_lock);
550 }
551
552 fprintf(stdout, "\n%s: ", msg);
553 if (getline(&buf, &dummy, stdin) < 0)
554 goto out_free;
555
556 p = strchr(buf, '\n');
557 if (p)
558 *p = 0;
559
560 pthread_mutex_lock(&active_symbols_lock);
561 syme = list_entry(active_symbols.next, struct sym_entry, node);
562 pthread_mutex_unlock(&active_symbols_lock);
563
564 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
565 struct symbol *sym = (struct symbol *)(syme + 1);
566
567 if (!strcmp(buf, sym->name)) {
568 found = syme;
569 break;
570 }
571 }
572
573 if (!found) {
574 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
575 sleep(1);
576 return;
577 } else
578 parse_source(found);
579
580 out_free:
581 free(buf);
582 }
583
584 static void print_mapped_keys(void)
585 {
586 char *name = NULL;
587
588 if (sym_filter_entry) {
589 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
590 name = sym->name;
591 }
592
593 fprintf(stdout, "\nMapped keys:\n");
594 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs);
595 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries);
596
597 if (nr_counters > 1)
598 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
599
600 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
601
602 if (vmlinux_name) {
603 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
604 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
605 fprintf(stdout, "\t[S] stop annotation.\n");
606 }
607
608 if (nr_counters > 1)
609 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
610
611 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
612 fprintf(stdout, "\t[qQ] quit.\n");
613 }
614
615 static int key_mapped(int c)
616 {
617 switch (c) {
618 case 'd':
619 case 'e':
620 case 'f':
621 case 'z':
622 case 'q':
623 case 'Q':
624 return 1;
625 case 'E':
626 case 'w':
627 return nr_counters > 1 ? 1 : 0;
628 case 'F':
629 case 's':
630 case 'S':
631 return vmlinux_name ? 1 : 0;
632 default:
633 break;
634 }
635
636 return 0;
637 }
638
639 static void handle_keypress(int c)
640 {
641 if (!key_mapped(c)) {
642 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
643 struct termios tc, save;
644
645 print_mapped_keys();
646 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
647 fflush(stdout);
648
649 tcgetattr(0, &save);
650 tc = save;
651 tc.c_lflag &= ~(ICANON | ECHO);
652 tc.c_cc[VMIN] = 0;
653 tc.c_cc[VTIME] = 0;
654 tcsetattr(0, TCSANOW, &tc);
655
656 poll(&stdin_poll, 1, -1);
657 c = getc(stdin);
658
659 tcsetattr(0, TCSAFLUSH, &save);
660 if (!key_mapped(c))
661 return;
662 }
663
664 switch (c) {
665 case 'd':
666 prompt_integer(&delay_secs, "Enter display delay");
667 if (delay_secs < 1)
668 delay_secs = 1;
669 break;
670 case 'e':
671 prompt_integer(&print_entries, "Enter display entries (lines)");
672 break;
673 case 'E':
674 if (nr_counters > 1) {
675 int i;
676
677 fprintf(stderr, "\nAvailable events:");
678 for (i = 0; i < nr_counters; i++)
679 fprintf(stderr, "\n\t%d %s", i, event_name(i));
680
681 prompt_integer(&sym_counter, "Enter details event counter");
682
683 if (sym_counter >= nr_counters) {
684 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
685 sym_counter = 0;
686 sleep(1);
687 }
688 } else sym_counter = 0;
689 break;
690 case 'f':
691 prompt_integer(&count_filter, "Enter display event count filter");
692 break;
693 case 'F':
694 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
695 break;
696 case 'q':
697 case 'Q':
698 printf("exiting.\n");
699 exit(0);
700 case 's':
701 prompt_symbol(&sym_filter_entry, "Enter details symbol");
702 break;
703 case 'S':
704 if (!sym_filter_entry)
705 break;
706 else {
707 struct sym_entry *syme = sym_filter_entry;
708
709 pthread_mutex_lock(&syme->source_lock);
710 sym_filter_entry = NULL;
711 __zero_source_counters(syme);
712 pthread_mutex_unlock(&syme->source_lock);
713 }
714 break;
715 case 'w':
716 display_weighted = ~display_weighted;
717 break;
718 case 'z':
719 zero = ~zero;
720 break;
721 default:
722 break;
723 }
724 }
725
726 static void *display_thread(void *arg __used)
727 {
728 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
729 struct termios tc, save;
730 int delay_msecs, c;
731
732 tcgetattr(0, &save);
733 tc = save;
734 tc.c_lflag &= ~(ICANON | ECHO);
735 tc.c_cc[VMIN] = 0;
736 tc.c_cc[VTIME] = 0;
737
738 repeat:
739 delay_msecs = delay_secs * 1000;
740 tcsetattr(0, TCSANOW, &tc);
741 /* trash return*/
742 getc(stdin);
743
744 do {
745 print_sym_table();
746 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
747
748 c = getc(stdin);
749 tcsetattr(0, TCSAFLUSH, &save);
750
751 handle_keypress(c);
752 goto repeat;
753
754 return NULL;
755 }
756
757 /* Tag samples to be skipped. */
758 static const char *skip_symbols[] = {
759 "default_idle",
760 "cpu_idle",
761 "enter_idle",
762 "exit_idle",
763 "mwait_idle",
764 "mwait_idle_with_hints",
765 "poll_idle",
766 "ppc64_runlatch_off",
767 "pseries_dedicated_idle_sleep",
768 NULL
769 };
770
771 static int symbol_filter(struct map *map, struct symbol *sym)
772 {
773 struct sym_entry *syme;
774 const char *name = sym->name;
775 int i;
776
777 /*
778 * ppc64 uses function descriptors and appends a '.' to the
779 * start of every instruction address. Remove it.
780 */
781 if (name[0] == '.')
782 name++;
783
784 if (!strcmp(name, "_text") ||
785 !strcmp(name, "_etext") ||
786 !strcmp(name, "_sinittext") ||
787 !strncmp("init_module", name, 11) ||
788 !strncmp("cleanup_module", name, 14) ||
789 strstr(name, "_text_start") ||
790 strstr(name, "_text_end"))
791 return 1;
792
793 syme = dso__sym_priv(map->dso, sym);
794 syme->map = map;
795 pthread_mutex_init(&syme->source_lock, NULL);
796 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
797 sym_filter_entry = syme;
798
799 for (i = 0; skip_symbols[i]; i++) {
800 if (!strcmp(skip_symbols[i], name)) {
801 syme->skip = 1;
802 break;
803 }
804 }
805
806 return 0;
807 }
808
809 static int parse_symbols(void)
810 {
811 if (dsos__load_kernel(vmlinux_name, sizeof(struct sym_entry),
812 symbol_filter, 1) <= 0)
813 return -1;
814
815 if (dump_symtab)
816 dsos__fprintf(stderr);
817
818 return 0;
819 }
820
821 /*
822 * Binary search in the histogram table and record the hit:
823 */
824 static void record_ip(u64 ip, int counter)
825 {
826 struct map *map;
827 struct symbol *sym = kernel_maps__find_symbol(ip, &map);
828
829 if (sym != NULL) {
830 struct sym_entry *syme = dso__sym_priv(map->dso, sym);
831
832 if (!syme->skip) {
833 syme->count[counter]++;
834 record_precise_ip(syme, counter, ip);
835 pthread_mutex_lock(&active_symbols_lock);
836 if (list_empty(&syme->node) || !syme->node.next)
837 __list_insert_active_sym(syme);
838 pthread_mutex_unlock(&active_symbols_lock);
839 return;
840 }
841 }
842
843 samples--;
844 }
845
846 static void process_event(u64 ip, int counter, int user)
847 {
848 samples++;
849
850 if (user) {
851 userspace_samples++;
852 return;
853 }
854
855 record_ip(ip, counter);
856 }
857
858 struct mmap_data {
859 int counter;
860 void *base;
861 int mask;
862 unsigned int prev;
863 };
864
865 static unsigned int mmap_read_head(struct mmap_data *md)
866 {
867 struct perf_event_mmap_page *pc = md->base;
868 int head;
869
870 head = pc->data_head;
871 rmb();
872
873 return head;
874 }
875
876 static void mmap_read_counter(struct mmap_data *md)
877 {
878 unsigned int head = mmap_read_head(md);
879 unsigned int old = md->prev;
880 unsigned char *data = md->base + page_size;
881 int diff;
882
883 /*
884 * If we're further behind than half the buffer, there's a chance
885 * the writer will bite our tail and mess up the samples under us.
886 *
887 * If we somehow ended up ahead of the head, we got messed up.
888 *
889 * In either case, truncate and restart at head.
890 */
891 diff = head - old;
892 if (diff > md->mask / 2 || diff < 0) {
893 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
894
895 /*
896 * head points to a known good entry, start there.
897 */
898 old = head;
899 }
900
901 for (; old != head;) {
902 event_t *event = (event_t *)&data[old & md->mask];
903
904 event_t event_copy;
905
906 size_t size = event->header.size;
907
908 /*
909 * Event straddles the mmap boundary -- header should always
910 * be inside due to u64 alignment of output.
911 */
912 if ((old & md->mask) + size != ((old + size) & md->mask)) {
913 unsigned int offset = old;
914 unsigned int len = min(sizeof(*event), size), cpy;
915 void *dst = &event_copy;
916
917 do {
918 cpy = min(md->mask + 1 - (offset & md->mask), len);
919 memcpy(dst, &data[offset & md->mask], cpy);
920 offset += cpy;
921 dst += cpy;
922 len -= cpy;
923 } while (len);
924
925 event = &event_copy;
926 }
927
928 old += size;
929
930 if (event->header.type == PERF_RECORD_SAMPLE) {
931 int user =
932 (event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
933 process_event(event->ip.ip, md->counter, user);
934 }
935 }
936
937 md->prev = old;
938 }
939
940 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
941 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
942
943 static void mmap_read(void)
944 {
945 int i, counter;
946
947 for (i = 0; i < nr_cpus; i++) {
948 for (counter = 0; counter < nr_counters; counter++)
949 mmap_read_counter(&mmap_array[i][counter]);
950 }
951 }
952
953 int nr_poll;
954 int group_fd;
955
956 static void start_counter(int i, int counter)
957 {
958 struct perf_event_attr *attr;
959 int cpu;
960
961 cpu = profile_cpu;
962 if (target_pid == -1 && profile_cpu == -1)
963 cpu = i;
964
965 attr = attrs + counter;
966
967 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
968
969 if (freq) {
970 attr->sample_type |= PERF_SAMPLE_PERIOD;
971 attr->freq = 1;
972 attr->sample_freq = freq;
973 }
974
975 attr->inherit = (cpu < 0) && inherit;
976
977 try_again:
978 fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
979
980 if (fd[i][counter] < 0) {
981 int err = errno;
982
983 if (err == EPERM)
984 die("No permission - are you root?\n");
985 /*
986 * If it's cycles then fall back to hrtimer
987 * based cpu-clock-tick sw counter, which
988 * is always available even if no PMU support:
989 */
990 if (attr->type == PERF_TYPE_HARDWARE
991 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
992
993 if (verbose)
994 warning(" ... trying to fall back to cpu-clock-ticks\n");
995
996 attr->type = PERF_TYPE_SOFTWARE;
997 attr->config = PERF_COUNT_SW_CPU_CLOCK;
998 goto try_again;
999 }
1000 printf("\n");
1001 error("perfcounter syscall returned with %d (%s)\n",
1002 fd[i][counter], strerror(err));
1003 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1004 exit(-1);
1005 }
1006 assert(fd[i][counter] >= 0);
1007 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1008
1009 /*
1010 * First counter acts as the group leader:
1011 */
1012 if (group && group_fd == -1)
1013 group_fd = fd[i][counter];
1014
1015 event_array[nr_poll].fd = fd[i][counter];
1016 event_array[nr_poll].events = POLLIN;
1017 nr_poll++;
1018
1019 mmap_array[i][counter].counter = counter;
1020 mmap_array[i][counter].prev = 0;
1021 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1022 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1023 PROT_READ, MAP_SHARED, fd[i][counter], 0);
1024 if (mmap_array[i][counter].base == MAP_FAILED)
1025 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1026 }
1027
1028 static int __cmd_top(void)
1029 {
1030 pthread_t thread;
1031 int i, counter;
1032 int ret;
1033
1034 for (i = 0; i < nr_cpus; i++) {
1035 group_fd = -1;
1036 for (counter = 0; counter < nr_counters; counter++)
1037 start_counter(i, counter);
1038 }
1039
1040 /* Wait for a minimal set of events before starting the snapshot */
1041 poll(event_array, nr_poll, 100);
1042
1043 mmap_read();
1044
1045 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1046 printf("Could not create display thread.\n");
1047 exit(-1);
1048 }
1049
1050 if (realtime_prio) {
1051 struct sched_param param;
1052
1053 param.sched_priority = realtime_prio;
1054 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1055 printf("Could not set realtime priority.\n");
1056 exit(-1);
1057 }
1058 }
1059
1060 while (1) {
1061 int hits = samples;
1062
1063 mmap_read();
1064
1065 if (hits == samples)
1066 ret = poll(event_array, nr_poll, 100);
1067 }
1068
1069 return 0;
1070 }
1071
1072 static const char * const top_usage[] = {
1073 "perf top [<options>]",
1074 NULL
1075 };
1076
1077 static const struct option options[] = {
1078 OPT_CALLBACK('e', "event", NULL, "event",
1079 "event selector. use 'perf list' to list available events",
1080 parse_events),
1081 OPT_INTEGER('c', "count", &default_interval,
1082 "event period to sample"),
1083 OPT_INTEGER('p', "pid", &target_pid,
1084 "profile events on existing pid"),
1085 OPT_BOOLEAN('a', "all-cpus", &system_wide,
1086 "system-wide collection from all CPUs"),
1087 OPT_INTEGER('C', "CPU", &profile_cpu,
1088 "CPU to profile on"),
1089 OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
1090 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1091 "number of mmap data pages"),
1092 OPT_INTEGER('r', "realtime", &realtime_prio,
1093 "collect data with this RT SCHED_FIFO priority"),
1094 OPT_INTEGER('d', "delay", &delay_secs,
1095 "number of seconds to delay between refreshes"),
1096 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1097 "dump the symbol table used for profiling"),
1098 OPT_INTEGER('f', "count-filter", &count_filter,
1099 "only display functions with more events than this"),
1100 OPT_BOOLEAN('g', "group", &group,
1101 "put the counters into a counter group"),
1102 OPT_BOOLEAN('i', "inherit", &inherit,
1103 "child tasks inherit counters"),
1104 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1105 "symbol to annotate - requires -k option"),
1106 OPT_BOOLEAN('z', "zero", &zero,
1107 "zero history across updates"),
1108 OPT_INTEGER('F', "freq", &freq,
1109 "profile at this frequency"),
1110 OPT_INTEGER('E', "entries", &print_entries,
1111 "display this many functions"),
1112 OPT_BOOLEAN('v', "verbose", &verbose,
1113 "be more verbose (show counter open errors, etc)"),
1114 OPT_END()
1115 };
1116
1117 int cmd_top(int argc, const char **argv, const char *prefix __used)
1118 {
1119 int counter;
1120
1121 symbol__init();
1122
1123 page_size = sysconf(_SC_PAGE_SIZE);
1124
1125 argc = parse_options(argc, argv, options, top_usage, 0);
1126 if (argc)
1127 usage_with_options(top_usage, options);
1128
1129 /* CPU and PID are mutually exclusive */
1130 if (target_pid != -1 && profile_cpu != -1) {
1131 printf("WARNING: PID switch overriding CPU\n");
1132 sleep(1);
1133 profile_cpu = -1;
1134 }
1135
1136 if (!nr_counters)
1137 nr_counters = 1;
1138
1139 if (delay_secs < 1)
1140 delay_secs = 1;
1141
1142 parse_symbols();
1143 parse_source(sym_filter_entry);
1144
1145
1146 /*
1147 * User specified count overrides default frequency.
1148 */
1149 if (default_interval)
1150 freq = 0;
1151 else if (freq) {
1152 default_interval = freq;
1153 } else {
1154 fprintf(stderr, "frequency and count are zero, aborting\n");
1155 exit(EXIT_FAILURE);
1156 }
1157
1158 /*
1159 * Fill in the ones not specifically initialized via -c:
1160 */
1161 for (counter = 0; counter < nr_counters; counter++) {
1162 if (attrs[counter].sample_period)
1163 continue;
1164
1165 attrs[counter].sample_period = default_interval;
1166 }
1167
1168 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1169 assert(nr_cpus <= MAX_NR_CPUS);
1170 assert(nr_cpus >= 0);
1171
1172 if (target_pid != -1 || profile_cpu != -1)
1173 nr_cpus = 1;
1174
1175 return __cmd_top();
1176 }
x86 "subsystem" repository