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dm snapshot: only take lock for statustype info not table
[linux-2.6/x86.git] / tools / perf / builtin-top.c
blobe0a374d0e43a8da197177a7ccccbc3ada6349a2e
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;
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 static bool hide_kernel_symbols = false;
80 static bool hide_user_symbols = false;
81 static struct winsize winsize;
82 struct symbol_conf symbol_conf;
83
84 /*
85 * Source
86 */
87
88 struct source_line {
89 u64 eip;
90 unsigned long count[MAX_COUNTERS];
91 char *line;
92 struct source_line *next;
93 };
94
95 static char *sym_filter = NULL;
96 struct sym_entry *sym_filter_entry = NULL;
97 static int sym_pcnt_filter = 5;
98 static int sym_counter = 0;
99 static int display_weighted = -1;
100
101 /*
102 * Symbols
103 */
104
105 struct sym_entry_source {
106 struct source_line *source;
107 struct source_line *lines;
108 struct source_line **lines_tail;
109 pthread_mutex_t lock;
110 };
111
112 struct sym_entry {
113 struct rb_node rb_node;
114 struct list_head node;
115 unsigned long snap_count;
116 double weight;
117 int skip;
118 u16 name_len;
119 u8 origin;
120 struct map *map;
121 struct sym_entry_source *src;
122 unsigned long count[0];
123 };
124
125 /*
126 * Source functions
127 */
128
129 static inline struct symbol *sym_entry__symbol(struct sym_entry *self)
130 {
131 return ((void *)self) + symbol_conf.priv_size;
132 }
133
134 static void get_term_dimensions(struct winsize *ws)
135 {
136 char *s = getenv("LINES");
137
138 if (s != NULL) {
139 ws->ws_row = atoi(s);
140 s = getenv("COLUMNS");
141 if (s != NULL) {
142 ws->ws_col = atoi(s);
143 if (ws->ws_row && ws->ws_col)
144 return;
145 }
146 }
147 #ifdef TIOCGWINSZ
148 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
149 ws->ws_row && ws->ws_col)
150 return;
151 #endif
152 ws->ws_row = 25;
153 ws->ws_col = 80;
154 }
155
156 static void update_print_entries(struct winsize *ws)
157 {
158 print_entries = ws->ws_row;
159
160 if (print_entries > 9)
161 print_entries -= 9;
162 }
163
164 static void sig_winch_handler(int sig __used)
165 {
166 get_term_dimensions(&winsize);
167 update_print_entries(&winsize);
168 }
169
170 static void parse_source(struct sym_entry *syme)
171 {
172 struct symbol *sym;
173 struct sym_entry_source *source;
174 struct map *map;
175 FILE *file;
176 char command[PATH_MAX*2];
177 const char *path;
178 u64 len;
179
180 if (!syme)
181 return;
182
183 if (syme->src == NULL) {
184 syme->src = zalloc(sizeof(*source));
185 if (syme->src == NULL)
186 return;
187 pthread_mutex_init(&syme->src->lock, NULL);
188 }
189
190 source = syme->src;
191
192 if (source->lines) {
193 pthread_mutex_lock(&source->lock);
194 goto out_assign;
195 }
196
197 sym = sym_entry__symbol(syme);
198 map = syme->map;
199 path = map->dso->long_name;
200
201 len = sym->end - sym->start;
202
203 sprintf(command,
204 "objdump --start-address=0x%016Lx "
205 "--stop-address=0x%016Lx -dS %s",
206 map->unmap_ip(map, sym->start),
207 map->unmap_ip(map, sym->end), path);
208
209 file = popen(command, "r");
210 if (!file)
211 return;
212
213 pthread_mutex_lock(&source->lock);
214 source->lines_tail = &source->lines;
215 while (!feof(file)) {
216 struct source_line *src;
217 size_t dummy = 0;
218 char *c;
219
220 src = malloc(sizeof(struct source_line));
221 assert(src != NULL);
222 memset(src, 0, sizeof(struct source_line));
223
224 if (getline(&src->line, &dummy, file) < 0)
225 break;
226 if (!src->line)
227 break;
228
229 c = strchr(src->line, '\n');
230 if (c)
231 *c = 0;
232
233 src->next = NULL;
234 *source->lines_tail = src;
235 source->lines_tail = &src->next;
236
237 if (strlen(src->line)>8 && src->line[8] == ':') {
238 src->eip = strtoull(src->line, NULL, 16);
239 src->eip = map->unmap_ip(map, src->eip);
240 }
241 if (strlen(src->line)>8 && src->line[16] == ':') {
242 src->eip = strtoull(src->line, NULL, 16);
243 src->eip = map->unmap_ip(map, src->eip);
244 }
245 }
246 pclose(file);
247 out_assign:
248 sym_filter_entry = syme;
249 pthread_mutex_unlock(&source->lock);
250 }
251
252 static void __zero_source_counters(struct sym_entry *syme)
253 {
254 int i;
255 struct source_line *line;
256
257 line = syme->src->lines;
258 while (line) {
259 for (i = 0; i < nr_counters; i++)
260 line->count[i] = 0;
261 line = line->next;
262 }
263 }
264
265 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
266 {
267 struct source_line *line;
268
269 if (syme != sym_filter_entry)
270 return;
271
272 if (pthread_mutex_trylock(&syme->src->lock))
273 return;
274
275 if (syme->src == NULL || syme->src->source == NULL)
276 goto out_unlock;
277
278 for (line = syme->src->lines; line; line = line->next) {
279 if (line->eip == ip) {
280 line->count[counter]++;
281 break;
282 }
283 if (line->eip > ip)
284 break;
285 }
286 out_unlock:
287 pthread_mutex_unlock(&syme->src->lock);
288 }
289
290 static void lookup_sym_source(struct sym_entry *syme)
291 {
292 struct symbol *symbol = sym_entry__symbol(syme);
293 struct source_line *line;
294 char pattern[PATH_MAX];
295
296 sprintf(pattern, "<%s>:", symbol->name);
297
298 pthread_mutex_lock(&syme->src->lock);
299 for (line = syme->src->lines; line; line = line->next) {
300 if (strstr(line->line, pattern)) {
301 syme->src->source = line;
302 break;
303 }
304 }
305 pthread_mutex_unlock(&syme->src->lock);
306 }
307
308 static void show_lines(struct source_line *queue, int count, int total)
309 {
310 int i;
311 struct source_line *line;
312
313 line = queue;
314 for (i = 0; i < count; i++) {
315 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
316
317 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
318 line = line->next;
319 }
320 }
321
322 #define TRACE_COUNT 3
323
324 static void show_details(struct sym_entry *syme)
325 {
326 struct symbol *symbol;
327 struct source_line *line;
328 struct source_line *line_queue = NULL;
329 int displayed = 0;
330 int line_queue_count = 0, total = 0, more = 0;
331
332 if (!syme)
333 return;
334
335 if (!syme->src->source)
336 lookup_sym_source(syme);
337
338 if (!syme->src->source)
339 return;
340
341 symbol = sym_entry__symbol(syme);
342 printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
343 printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
344
345 pthread_mutex_lock(&syme->src->lock);
346 line = syme->src->source;
347 while (line) {
348 total += line->count[sym_counter];
349 line = line->next;
350 }
351
352 line = syme->src->source;
353 while (line) {
354 float pcnt = 0.0;
355
356 if (!line_queue_count)
357 line_queue = line;
358 line_queue_count++;
359
360 if (line->count[sym_counter])
361 pcnt = 100.0 * line->count[sym_counter] / (float)total;
362 if (pcnt >= (float)sym_pcnt_filter) {
363 if (displayed <= print_entries)
364 show_lines(line_queue, line_queue_count, total);
365 else more++;
366 displayed += line_queue_count;
367 line_queue_count = 0;
368 line_queue = NULL;
369 } else if (line_queue_count > TRACE_COUNT) {
370 line_queue = line_queue->next;
371 line_queue_count--;
372 }
373
374 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
375 line = line->next;
376 }
377 pthread_mutex_unlock(&syme->src->lock);
378 if (more)
379 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
380 }
381
382 /*
383 * Symbols will be added here in event__process_sample and will get out
384 * after decayed.
385 */
386 static LIST_HEAD(active_symbols);
387 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
388
389 /*
390 * Ordering weight: count-1 * count-2 * ... / count-n
391 */
392 static double sym_weight(const struct sym_entry *sym)
393 {
394 double weight = sym->snap_count;
395 int counter;
396
397 if (!display_weighted)
398 return weight;
399
400 for (counter = 1; counter < nr_counters-1; counter++)
401 weight *= sym->count[counter];
402
403 weight /= (sym->count[counter] + 1);
404
405 return weight;
406 }
407
408 static long samples;
409 static long userspace_samples;
410 static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
411
412 static void __list_insert_active_sym(struct sym_entry *syme)
413 {
414 list_add(&syme->node, &active_symbols);
415 }
416
417 static void list_remove_active_sym(struct sym_entry *syme)
418 {
419 pthread_mutex_lock(&active_symbols_lock);
420 list_del_init(&syme->node);
421 pthread_mutex_unlock(&active_symbols_lock);
422 }
423
424 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
425 {
426 struct rb_node **p = &tree->rb_node;
427 struct rb_node *parent = NULL;
428 struct sym_entry *iter;
429
430 while (*p != NULL) {
431 parent = *p;
432 iter = rb_entry(parent, struct sym_entry, rb_node);
433
434 if (se->weight > iter->weight)
435 p = &(*p)->rb_left;
436 else
437 p = &(*p)->rb_right;
438 }
439
440 rb_link_node(&se->rb_node, parent, p);
441 rb_insert_color(&se->rb_node, tree);
442 }
443
444 static void print_sym_table(void)
445 {
446 int printed = 0, j;
447 int counter, snap = !display_weighted ? sym_counter : 0;
448 float samples_per_sec = samples/delay_secs;
449 float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
450 float sum_ksamples = 0.0;
451 struct sym_entry *syme, *n;
452 struct rb_root tmp = RB_ROOT;
453 struct rb_node *nd;
454 int sym_width = 0, dso_width = 0, max_dso_width;
455 const int win_width = winsize.ws_col - 1;
456
457 samples = userspace_samples = 0;
458
459 /* Sort the active symbols */
460 pthread_mutex_lock(&active_symbols_lock);
461 syme = list_entry(active_symbols.next, struct sym_entry, node);
462 pthread_mutex_unlock(&active_symbols_lock);
463
464 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
465 syme->snap_count = syme->count[snap];
466 if (syme->snap_count != 0) {
467
468 if ((hide_user_symbols &&
469 syme->origin == PERF_RECORD_MISC_USER) ||
470 (hide_kernel_symbols &&
471 syme->origin == PERF_RECORD_MISC_KERNEL)) {
472 list_remove_active_sym(syme);
473 continue;
474 }
475 syme->weight = sym_weight(syme);
476 rb_insert_active_sym(&tmp, syme);
477 sum_ksamples += syme->snap_count;
478
479 for (j = 0; j < nr_counters; j++)
480 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
481 } else
482 list_remove_active_sym(syme);
483 }
484
485 puts(CONSOLE_CLEAR);
486
487 printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
488 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
489 samples_per_sec,
490 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
491
492 if (nr_counters == 1 || !display_weighted) {
493 printf("%Ld", (u64)attrs[0].sample_period);
494 if (freq)
495 printf("Hz ");
496 else
497 printf(" ");
498 }
499
500 if (!display_weighted)
501 printf("%s", event_name(sym_counter));
502 else for (counter = 0; counter < nr_counters; counter++) {
503 if (counter)
504 printf("/");
505
506 printf("%s", event_name(counter));
507 }
508
509 printf( "], ");
510
511 if (target_pid != -1)
512 printf(" (target_pid: %d", target_pid);
513 else
514 printf(" (all");
515
516 if (profile_cpu != -1)
517 printf(", cpu: %d)\n", profile_cpu);
518 else {
519 if (target_pid != -1)
520 printf(")\n");
521 else
522 printf(", %d CPUs)\n", nr_cpus);
523 }
524
525 printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
526
527 if (sym_filter_entry) {
528 show_details(sym_filter_entry);
529 return;
530 }
531
532 /*
533 * Find the longest symbol name that will be displayed
534 */
535 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
536 syme = rb_entry(nd, struct sym_entry, rb_node);
537 if (++printed > print_entries ||
538 (int)syme->snap_count < count_filter)
539 continue;
540
541 if (syme->map->dso->long_name_len > dso_width)
542 dso_width = syme->map->dso->long_name_len;
543
544 if (syme->name_len > sym_width)
545 sym_width = syme->name_len;
546 }
547
548 printed = 0;
549
550 max_dso_width = winsize.ws_col - sym_width - 29;
551 if (dso_width > max_dso_width)
552 dso_width = max_dso_width;
553 putchar('\n');
554 if (nr_counters == 1)
555 printf(" samples pcnt");
556 else
557 printf(" weight samples pcnt");
558
559 if (verbose)
560 printf(" RIP ");
561 printf(" %-*.*s DSO\n", sym_width, sym_width, "function");
562 printf(" %s _______ _____",
563 nr_counters == 1 ? " " : "______");
564 if (verbose)
565 printf(" ________________");
566 printf(" %-*.*s", sym_width, sym_width, graph_line);
567 printf(" %-*.*s", dso_width, dso_width, graph_line);
568 puts("\n");
569
570 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
571 struct symbol *sym;
572 double pcnt;
573
574 syme = rb_entry(nd, struct sym_entry, rb_node);
575 sym = sym_entry__symbol(syme);
576
577 if (++printed > print_entries || (int)syme->snap_count < count_filter)
578 continue;
579
580 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
581 sum_ksamples));
582
583 if (nr_counters == 1 || !display_weighted)
584 printf("%20.2f ", syme->weight);
585 else
586 printf("%9.1f %10ld ", syme->weight, syme->snap_count);
587
588 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
589 if (verbose)
590 printf(" %016llx", sym->start);
591 printf(" %-*.*s", sym_width, sym_width, sym->name);
592 printf(" %-*.*s\n", dso_width, dso_width,
593 dso_width >= syme->map->dso->long_name_len ?
594 syme->map->dso->long_name :
595 syme->map->dso->short_name);
596 }
597 }
598
599 static void prompt_integer(int *target, const char *msg)
600 {
601 char *buf = malloc(0), *p;
602 size_t dummy = 0;
603 int tmp;
604
605 fprintf(stdout, "\n%s: ", msg);
606 if (getline(&buf, &dummy, stdin) < 0)
607 return;
608
609 p = strchr(buf, '\n');
610 if (p)
611 *p = 0;
612
613 p = buf;
614 while(*p) {
615 if (!isdigit(*p))
616 goto out_free;
617 p++;
618 }
619 tmp = strtoul(buf, NULL, 10);
620 *target = tmp;
621 out_free:
622 free(buf);
623 }
624
625 static void prompt_percent(int *target, const char *msg)
626 {
627 int tmp = 0;
628
629 prompt_integer(&tmp, msg);
630 if (tmp >= 0 && tmp <= 100)
631 *target = tmp;
632 }
633
634 static void prompt_symbol(struct sym_entry **target, const char *msg)
635 {
636 char *buf = malloc(0), *p;
637 struct sym_entry *syme = *target, *n, *found = NULL;
638 size_t dummy = 0;
639
640 /* zero counters of active symbol */
641 if (syme) {
642 pthread_mutex_lock(&syme->src->lock);
643 __zero_source_counters(syme);
644 *target = NULL;
645 pthread_mutex_unlock(&syme->src->lock);
646 }
647
648 fprintf(stdout, "\n%s: ", msg);
649 if (getline(&buf, &dummy, stdin) < 0)
650 goto out_free;
651
652 p = strchr(buf, '\n');
653 if (p)
654 *p = 0;
655
656 pthread_mutex_lock(&active_symbols_lock);
657 syme = list_entry(active_symbols.next, struct sym_entry, node);
658 pthread_mutex_unlock(&active_symbols_lock);
659
660 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
661 struct symbol *sym = sym_entry__symbol(syme);
662
663 if (!strcmp(buf, sym->name)) {
664 found = syme;
665 break;
666 }
667 }
668
669 if (!found) {
670 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
671 sleep(1);
672 return;
673 } else
674 parse_source(found);
675
676 out_free:
677 free(buf);
678 }
679
680 static void print_mapped_keys(void)
681 {
682 char *name = NULL;
683
684 if (sym_filter_entry) {
685 struct symbol *sym = sym_entry__symbol(sym_filter_entry);
686 name = sym->name;
687 }
688
689 fprintf(stdout, "\nMapped keys:\n");
690 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs);
691 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries);
692
693 if (nr_counters > 1)
694 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
695
696 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
697
698 if (symbol_conf.vmlinux_name) {
699 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
700 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
701 fprintf(stdout, "\t[S] stop annotation.\n");
702 }
703
704 if (nr_counters > 1)
705 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
706
707 fprintf(stdout,
708 "\t[K] hide kernel_symbols symbols. \t(%s)\n",
709 hide_kernel_symbols ? "yes" : "no");
710 fprintf(stdout,
711 "\t[U] hide user symbols. \t(%s)\n",
712 hide_user_symbols ? "yes" : "no");
713 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
714 fprintf(stdout, "\t[qQ] quit.\n");
715 }
716
717 static int key_mapped(int c)
718 {
719 switch (c) {
720 case 'd':
721 case 'e':
722 case 'f':
723 case 'z':
724 case 'q':
725 case 'Q':
726 case 'K':
727 case 'U':
728 return 1;
729 case 'E':
730 case 'w':
731 return nr_counters > 1 ? 1 : 0;
732 case 'F':
733 case 's':
734 case 'S':
735 return symbol_conf.vmlinux_name ? 1 : 0;
736 default:
737 break;
738 }
739
740 return 0;
741 }
742
743 static void handle_keypress(int c)
744 {
745 if (!key_mapped(c)) {
746 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
747 struct termios tc, save;
748
749 print_mapped_keys();
750 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
751 fflush(stdout);
752
753 tcgetattr(0, &save);
754 tc = save;
755 tc.c_lflag &= ~(ICANON | ECHO);
756 tc.c_cc[VMIN] = 0;
757 tc.c_cc[VTIME] = 0;
758 tcsetattr(0, TCSANOW, &tc);
759
760 poll(&stdin_poll, 1, -1);
761 c = getc(stdin);
762
763 tcsetattr(0, TCSAFLUSH, &save);
764 if (!key_mapped(c))
765 return;
766 }
767
768 switch (c) {
769 case 'd':
770 prompt_integer(&delay_secs, "Enter display delay");
771 if (delay_secs < 1)
772 delay_secs = 1;
773 break;
774 case 'e':
775 prompt_integer(&print_entries, "Enter display entries (lines)");
776 if (print_entries == 0) {
777 sig_winch_handler(SIGWINCH);
778 signal(SIGWINCH, sig_winch_handler);
779 } else
780 signal(SIGWINCH, SIG_DFL);
781 break;
782 case 'E':
783 if (nr_counters > 1) {
784 int i;
785
786 fprintf(stderr, "\nAvailable events:");
787 for (i = 0; i < nr_counters; i++)
788 fprintf(stderr, "\n\t%d %s", i, event_name(i));
789
790 prompt_integer(&sym_counter, "Enter details event counter");
791
792 if (sym_counter >= nr_counters) {
793 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
794 sym_counter = 0;
795 sleep(1);
796 }
797 } else sym_counter = 0;
798 break;
799 case 'f':
800 prompt_integer(&count_filter, "Enter display event count filter");
801 break;
802 case 'F':
803 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
804 break;
805 case 'K':
806 hide_kernel_symbols = !hide_kernel_symbols;
807 break;
808 case 'q':
809 case 'Q':
810 printf("exiting.\n");
811 if (dump_symtab)
812 dsos__fprintf(stderr);
813 exit(0);
814 case 's':
815 prompt_symbol(&sym_filter_entry, "Enter details symbol");
816 break;
817 case 'S':
818 if (!sym_filter_entry)
819 break;
820 else {
821 struct sym_entry *syme = sym_filter_entry;
822
823 pthread_mutex_lock(&syme->src->lock);
824 sym_filter_entry = NULL;
825 __zero_source_counters(syme);
826 pthread_mutex_unlock(&syme->src->lock);
827 }
828 break;
829 case 'U':
830 hide_user_symbols = !hide_user_symbols;
831 break;
832 case 'w':
833 display_weighted = ~display_weighted;
834 break;
835 case 'z':
836 zero = ~zero;
837 break;
838 default:
839 break;
840 }
841 }
842
843 static void *display_thread(void *arg __used)
844 {
845 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
846 struct termios tc, save;
847 int delay_msecs, c;
848
849 tcgetattr(0, &save);
850 tc = save;
851 tc.c_lflag &= ~(ICANON | ECHO);
852 tc.c_cc[VMIN] = 0;
853 tc.c_cc[VTIME] = 0;
854
855 repeat:
856 delay_msecs = delay_secs * 1000;
857 tcsetattr(0, TCSANOW, &tc);
858 /* trash return*/
859 getc(stdin);
860
861 do {
862 print_sym_table();
863 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
864
865 c = getc(stdin);
866 tcsetattr(0, TCSAFLUSH, &save);
867
868 handle_keypress(c);
869 goto repeat;
870
871 return NULL;
872 }
873
874 /* Tag samples to be skipped. */
875 static const char *skip_symbols[] = {
876 "default_idle",
877 "cpu_idle",
878 "enter_idle",
879 "exit_idle",
880 "mwait_idle",
881 "mwait_idle_with_hints",
882 "poll_idle",
883 "ppc64_runlatch_off",
884 "pseries_dedicated_idle_sleep",
885 NULL
886 };
887
888 static int symbol_filter(struct map *map, struct symbol *sym)
889 {
890 struct sym_entry *syme;
891 const char *name = sym->name;
892 int i;
893
894 /*
895 * ppc64 uses function descriptors and appends a '.' to the
896 * start of every instruction address. Remove it.
897 */
898 if (name[0] == '.')
899 name++;
900
901 if (!strcmp(name, "_text") ||
902 !strcmp(name, "_etext") ||
903 !strcmp(name, "_sinittext") ||
904 !strncmp("init_module", name, 11) ||
905 !strncmp("cleanup_module", name, 14) ||
906 strstr(name, "_text_start") ||
907 strstr(name, "_text_end"))
908 return 1;
909
910 syme = symbol__priv(sym);
911 syme->map = map;
912 syme->src = NULL;
913 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
914 sym_filter_entry = syme;
915
916 for (i = 0; skip_symbols[i]; i++) {
917 if (!strcmp(skip_symbols[i], name)) {
918 syme->skip = 1;
919 break;
920 }
921 }
922
923 if (!syme->skip)
924 syme->name_len = strlen(sym->name);
925
926 return 0;
927 }
928
929 static void event__process_sample(const event_t *self, int counter)
930 {
931 u64 ip = self->ip.ip;
932 struct sym_entry *syme;
933 struct addr_location al;
934 u8 origin = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
935
936 switch (origin) {
937 case PERF_RECORD_MISC_USER:
938 if (hide_user_symbols)
939 return;
940 break;
941 case PERF_RECORD_MISC_KERNEL:
942 if (hide_kernel_symbols)
943 return;
944 break;
945 default:
946 return;
947 }
948
949 if (event__preprocess_sample(self, &al, symbol_filter) < 0 ||
950 al.sym == NULL)
951 return;
952
953 syme = symbol__priv(al.sym);
954 if (!syme->skip) {
955 syme->count[counter]++;
956 syme->origin = origin;
957 record_precise_ip(syme, counter, ip);
958 pthread_mutex_lock(&active_symbols_lock);
959 if (list_empty(&syme->node) || !syme->node.next)
960 __list_insert_active_sym(syme);
961 pthread_mutex_unlock(&active_symbols_lock);
962 if (origin == PERF_RECORD_MISC_USER)
963 ++userspace_samples;
964 ++samples;
965 }
966 }
967
968 static int event__process(event_t *event)
969 {
970 switch (event->header.type) {
971 case PERF_RECORD_COMM:
972 event__process_comm(event);
973 break;
974 case PERF_RECORD_MMAP:
975 event__process_mmap(event);
976 break;
977 default:
978 break;
979 }
980
981 return 0;
982 }
983
984 struct mmap_data {
985 int counter;
986 void *base;
987 int mask;
988 unsigned int prev;
989 };
990
991 static unsigned int mmap_read_head(struct mmap_data *md)
992 {
993 struct perf_event_mmap_page *pc = md->base;
994 int head;
995
996 head = pc->data_head;
997 rmb();
998
999 return head;
1000 }
1001
1002 static void mmap_read_counter(struct mmap_data *md)
1003 {
1004 unsigned int head = mmap_read_head(md);
1005 unsigned int old = md->prev;
1006 unsigned char *data = md->base + page_size;
1007 int diff;
1008
1009 /*
1010 * If we're further behind than half the buffer, there's a chance
1011 * the writer will bite our tail and mess up the samples under us.
1012 *
1013 * If we somehow ended up ahead of the head, we got messed up.
1014 *
1015 * In either case, truncate and restart at head.
1016 */
1017 diff = head - old;
1018 if (diff > md->mask / 2 || diff < 0) {
1019 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
1020
1021 /*
1022 * head points to a known good entry, start there.
1023 */
1024 old = head;
1025 }
1026
1027 for (; old != head;) {
1028 event_t *event = (event_t *)&data[old & md->mask];
1029
1030 event_t event_copy;
1031
1032 size_t size = event->header.size;
1033
1034 /*
1035 * Event straddles the mmap boundary -- header should always
1036 * be inside due to u64 alignment of output.
1037 */
1038 if ((old & md->mask) + size != ((old + size) & md->mask)) {
1039 unsigned int offset = old;
1040 unsigned int len = min(sizeof(*event), size), cpy;
1041 void *dst = &event_copy;
1042
1043 do {
1044 cpy = min(md->mask + 1 - (offset & md->mask), len);
1045 memcpy(dst, &data[offset & md->mask], cpy);
1046 offset += cpy;
1047 dst += cpy;
1048 len -= cpy;
1049 } while (len);
1050
1051 event = &event_copy;
1052 }
1053
1054 if (event->header.type == PERF_RECORD_SAMPLE)
1055 event__process_sample(event, md->counter);
1056 else
1057 event__process(event);
1058 old += size;
1059 }
1060
1061 md->prev = old;
1062 }
1063
1064 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
1065 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
1066
1067 static void mmap_read(void)
1068 {
1069 int i, counter;
1070
1071 for (i = 0; i < nr_cpus; i++) {
1072 for (counter = 0; counter < nr_counters; counter++)
1073 mmap_read_counter(&mmap_array[i][counter]);
1074 }
1075 }
1076
1077 int nr_poll;
1078 int group_fd;
1079
1080 static void start_counter(int i, int counter)
1081 {
1082 struct perf_event_attr *attr;
1083 int cpu;
1084
1085 cpu = profile_cpu;
1086 if (target_pid == -1 && profile_cpu == -1)
1087 cpu = i;
1088
1089 attr = attrs + counter;
1090
1091 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1092
1093 if (freq) {
1094 attr->sample_type |= PERF_SAMPLE_PERIOD;
1095 attr->freq = 1;
1096 attr->sample_freq = freq;
1097 }
1098
1099 attr->inherit = (cpu < 0) && inherit;
1100 attr->mmap = 1;
1101
1102 try_again:
1103 fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
1104
1105 if (fd[i][counter] < 0) {
1106 int err = errno;
1107
1108 if (err == EPERM || err == EACCES)
1109 die("No permission - are you root?\n");
1110 /*
1111 * If it's cycles then fall back to hrtimer
1112 * based cpu-clock-tick sw counter, which
1113 * is always available even if no PMU support:
1114 */
1115 if (attr->type == PERF_TYPE_HARDWARE
1116 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1117
1118 if (verbose)
1119 warning(" ... trying to fall back to cpu-clock-ticks\n");
1120
1121 attr->type = PERF_TYPE_SOFTWARE;
1122 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1123 goto try_again;
1124 }
1125 printf("\n");
1126 error("perfcounter syscall returned with %d (%s)\n",
1127 fd[i][counter], strerror(err));
1128 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1129 exit(-1);
1130 }
1131 assert(fd[i][counter] >= 0);
1132 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1133
1134 /*
1135 * First counter acts as the group leader:
1136 */
1137 if (group && group_fd == -1)
1138 group_fd = fd[i][counter];
1139
1140 event_array[nr_poll].fd = fd[i][counter];
1141 event_array[nr_poll].events = POLLIN;
1142 nr_poll++;
1143
1144 mmap_array[i][counter].counter = counter;
1145 mmap_array[i][counter].prev = 0;
1146 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1147 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1148 PROT_READ, MAP_SHARED, fd[i][counter], 0);
1149 if (mmap_array[i][counter].base == MAP_FAILED)
1150 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1151 }
1152
1153 static int __cmd_top(void)
1154 {
1155 pthread_t thread;
1156 int i, counter;
1157 int ret;
1158
1159 if (target_pid != -1)
1160 event__synthesize_thread(target_pid, event__process);
1161 else
1162 event__synthesize_threads(event__process);
1163
1164 for (i = 0; i < nr_cpus; i++) {
1165 group_fd = -1;
1166 for (counter = 0; counter < nr_counters; counter++)
1167 start_counter(i, counter);
1168 }
1169
1170 /* Wait for a minimal set of events before starting the snapshot */
1171 poll(event_array, nr_poll, 100);
1172
1173 mmap_read();
1174
1175 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1176 printf("Could not create display thread.\n");
1177 exit(-1);
1178 }
1179
1180 if (realtime_prio) {
1181 struct sched_param param;
1182
1183 param.sched_priority = realtime_prio;
1184 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1185 printf("Could not set realtime priority.\n");
1186 exit(-1);
1187 }
1188 }
1189
1190 while (1) {
1191 int hits = samples;
1192
1193 mmap_read();
1194
1195 if (hits == samples)
1196 ret = poll(event_array, nr_poll, 100);
1197 }
1198
1199 return 0;
1200 }
1201
1202 static const char * const top_usage[] = {
1203 "perf top [<options>]",
1204 NULL
1205 };
1206
1207 static const struct option options[] = {
1208 OPT_CALLBACK('e', "event", NULL, "event",
1209 "event selector. use 'perf list' to list available events",
1210 parse_events),
1211 OPT_INTEGER('c', "count", &default_interval,
1212 "event period to sample"),
1213 OPT_INTEGER('p', "pid", &target_pid,
1214 "profile events on existing pid"),
1215 OPT_BOOLEAN('a', "all-cpus", &system_wide,
1216 "system-wide collection from all CPUs"),
1217 OPT_INTEGER('C', "CPU", &profile_cpu,
1218 "CPU to profile on"),
1219 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1220 "file", "vmlinux pathname"),
1221 OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols,
1222 "hide kernel symbols"),
1223 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1224 "number of mmap data pages"),
1225 OPT_INTEGER('r', "realtime", &realtime_prio,
1226 "collect data with this RT SCHED_FIFO priority"),
1227 OPT_INTEGER('d', "delay", &delay_secs,
1228 "number of seconds to delay between refreshes"),
1229 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1230 "dump the symbol table used for profiling"),
1231 OPT_INTEGER('f', "count-filter", &count_filter,
1232 "only display functions with more events than this"),
1233 OPT_BOOLEAN('g', "group", &group,
1234 "put the counters into a counter group"),
1235 OPT_BOOLEAN('i', "inherit", &inherit,
1236 "child tasks inherit counters"),
1237 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1238 "symbol to annotate - requires -k option"),
1239 OPT_BOOLEAN('z', "zero", &zero,
1240 "zero history across updates"),
1241 OPT_INTEGER('F', "freq", &freq,
1242 "profile at this frequency"),
1243 OPT_INTEGER('E', "entries", &print_entries,
1244 "display this many functions"),
1245 OPT_BOOLEAN('U', "hide_user_symbols", &hide_user_symbols,
1246 "hide user symbols"),
1247 OPT_BOOLEAN('v', "verbose", &verbose,
1248 "be more verbose (show counter open errors, etc)"),
1249 OPT_END()
1250 };
1251
1252 int cmd_top(int argc, const char **argv, const char *prefix __used)
1253 {
1254 int counter;
1255
1256 page_size = sysconf(_SC_PAGE_SIZE);
1257
1258 argc = parse_options(argc, argv, options, top_usage, 0);
1259 if (argc)
1260 usage_with_options(top_usage, options);
1261
1262 /* CPU and PID are mutually exclusive */
1263 if (target_pid != -1 && profile_cpu != -1) {
1264 printf("WARNING: PID switch overriding CPU\n");
1265 sleep(1);
1266 profile_cpu = -1;
1267 }
1268
1269 if (!nr_counters)
1270 nr_counters = 1;
1271
1272 symbol_conf.priv_size = (sizeof(struct sym_entry) +
1273 (nr_counters + 1) * sizeof(unsigned long));
1274 if (symbol_conf.vmlinux_name == NULL)
1275 symbol_conf.try_vmlinux_path = true;
1276 if (symbol__init(&symbol_conf) < 0)
1277 return -1;
1278
1279 if (delay_secs < 1)
1280 delay_secs = 1;
1281
1282 parse_source(sym_filter_entry);
1283
1284 /*
1285 * User specified count overrides default frequency.
1286 */
1287 if (default_interval)
1288 freq = 0;
1289 else if (freq) {
1290 default_interval = freq;
1291 } else {
1292 fprintf(stderr, "frequency and count are zero, aborting\n");
1293 exit(EXIT_FAILURE);
1294 }
1295
1296 /*
1297 * Fill in the ones not specifically initialized via -c:
1298 */
1299 for (counter = 0; counter < nr_counters; counter++) {
1300 if (attrs[counter].sample_period)
1301 continue;
1302
1303 attrs[counter].sample_period = default_interval;
1304 }
1305
1306 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1307 assert(nr_cpus <= MAX_NR_CPUS);
1308 assert(nr_cpus >= 0);
1309
1310 if (target_pid != -1 || profile_cpu != -1)
1311 nr_cpus = 1;
1312
1313 get_term_dimensions(&winsize);
1314 if (print_entries == 0) {
1315 update_print_entries(&winsize);
1316 signal(SIGWINCH, sig_winch_handler);
1317 }
1318
1319 return __cmd_top();
1320 }
x86 "subsystem" repository