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Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[deliverable/linux.git] / tools / perf / builtin-top.c
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/util.h"
26 #include <linux/rbtree.h>
27 #include "util/parse-options.h"
28 #include "util/parse-events.h"
29
30 #include "util/debug.h"
31
32 #include <assert.h>
33 #include <fcntl.h>
34
35 #include <stdio.h>
36 #include <termios.h>
37 #include <unistd.h>
38
39 #include <errno.h>
40 #include <time.h>
41 #include <sched.h>
42 #include <pthread.h>
43
44 #include <sys/syscall.h>
45 #include <sys/ioctl.h>
46 #include <sys/poll.h>
47 #include <sys/prctl.h>
48 #include <sys/wait.h>
49 #include <sys/uio.h>
50 #include <sys/mman.h>
51
52 #include <linux/unistd.h>
53 #include <linux/types.h>
54
55 static int fd[MAX_NR_CPUS][MAX_COUNTERS];
56
57 static int system_wide = 0;
58
59 static int default_interval = 100000;
60
61 static int count_filter = 5;
62 static int print_entries = 15;
63
64 static int target_pid = -1;
65 static int inherit = 0;
66 static int profile_cpu = -1;
67 static int nr_cpus = 0;
68 static unsigned int realtime_prio = 0;
69 static int group = 0;
70 static unsigned int page_size;
71 static unsigned int mmap_pages = 16;
72 static int freq = 0;
73
74 static int delay_secs = 2;
75 static int zero;
76 static int dump_symtab;
77
78 /*
79 * Source
80 */
81
82 struct source_line {
83 u64 eip;
84 unsigned long count[MAX_COUNTERS];
85 char *line;
86 struct source_line *next;
87 };
88
89 static char *sym_filter = NULL;
90 struct sym_entry *sym_filter_entry = NULL;
91 static int sym_pcnt_filter = 5;
92 static int sym_counter = 0;
93 static int display_weighted = -1;
94
95 /*
96 * Symbols
97 */
98
99 static u64 min_ip;
100 static u64 max_ip = -1ll;
101
102 struct sym_entry {
103 struct rb_node rb_node;
104 struct list_head node;
105 unsigned long count[MAX_COUNTERS];
106 unsigned long snap_count;
107 double weight;
108 int skip;
109 struct source_line *source;
110 struct source_line *lines;
111 struct source_line **lines_tail;
112 pthread_mutex_t source_lock;
113 };
114
115 /*
116 * Source functions
117 */
118
119 static void parse_source(struct sym_entry *syme)
120 {
121 struct symbol *sym;
122 struct module *module;
123 struct section *section = NULL;
124 FILE *file;
125 char command[PATH_MAX*2];
126 const char *path = vmlinux_name;
127 u64 start, end, len;
128
129 if (!syme)
130 return;
131
132 if (syme->lines) {
133 pthread_mutex_lock(&syme->source_lock);
134 goto out_assign;
135 }
136
137 sym = (struct symbol *)(syme + 1);
138 module = sym->module;
139
140 if (module)
141 path = module->path;
142 if (!path)
143 return;
144
145 start = sym->obj_start;
146 if (!start)
147 start = sym->start;
148
149 if (module) {
150 section = module->sections->find_section(module->sections, ".text");
151 if (section)
152 start -= section->vma;
153 }
154
155 end = start + sym->end - sym->start + 1;
156 len = sym->end - sym->start;
157
158 sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", start, end, path);
159
160 file = popen(command, "r");
161 if (!file)
162 return;
163
164 pthread_mutex_lock(&syme->source_lock);
165 syme->lines_tail = &syme->lines;
166 while (!feof(file)) {
167 struct source_line *src;
168 size_t dummy = 0;
169 char *c;
170
171 src = malloc(sizeof(struct source_line));
172 assert(src != NULL);
173 memset(src, 0, sizeof(struct source_line));
174
175 if (getline(&src->line, &dummy, file) < 0)
176 break;
177 if (!src->line)
178 break;
179
180 c = strchr(src->line, '\n');
181 if (c)
182 *c = 0;
183
184 src->next = NULL;
185 *syme->lines_tail = src;
186 syme->lines_tail = &src->next;
187
188 if (strlen(src->line)>8 && src->line[8] == ':') {
189 src->eip = strtoull(src->line, NULL, 16);
190 if (section)
191 src->eip += section->vma;
192 }
193 if (strlen(src->line)>8 && src->line[16] == ':') {
194 src->eip = strtoull(src->line, NULL, 16);
195 if (section)
196 src->eip += section->vma;
197 }
198 }
199 pclose(file);
200 out_assign:
201 sym_filter_entry = syme;
202 pthread_mutex_unlock(&syme->source_lock);
203 }
204
205 static void __zero_source_counters(struct sym_entry *syme)
206 {
207 int i;
208 struct source_line *line;
209
210 line = syme->lines;
211 while (line) {
212 for (i = 0; i < nr_counters; i++)
213 line->count[i] = 0;
214 line = line->next;
215 }
216 }
217
218 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
219 {
220 struct source_line *line;
221
222 if (syme != sym_filter_entry)
223 return;
224
225 if (pthread_mutex_trylock(&syme->source_lock))
226 return;
227
228 if (!syme->source)
229 goto out_unlock;
230
231 for (line = syme->lines; line; line = line->next) {
232 if (line->eip == ip) {
233 line->count[counter]++;
234 break;
235 }
236 if (line->eip > ip)
237 break;
238 }
239 out_unlock:
240 pthread_mutex_unlock(&syme->source_lock);
241 }
242
243 static void lookup_sym_source(struct sym_entry *syme)
244 {
245 struct symbol *symbol = (struct symbol *)(syme + 1);
246 struct source_line *line;
247 char pattern[PATH_MAX];
248 char *idx;
249
250 sprintf(pattern, "<%s>:", symbol->name);
251
252 if (symbol->module) {
253 idx = strstr(pattern, "\t");
254 if (idx)
255 *idx = 0;
256 }
257
258 pthread_mutex_lock(&syme->source_lock);
259 for (line = syme->lines; line; line = line->next) {
260 if (strstr(line->line, pattern)) {
261 syme->source = line;
262 break;
263 }
264 }
265 pthread_mutex_unlock(&syme->source_lock);
266 }
267
268 static void show_lines(struct source_line *queue, int count, int total)
269 {
270 int i;
271 struct source_line *line;
272
273 line = queue;
274 for (i = 0; i < count; i++) {
275 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
276
277 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
278 line = line->next;
279 }
280 }
281
282 #define TRACE_COUNT 3
283
284 static void show_details(struct sym_entry *syme)
285 {
286 struct symbol *symbol;
287 struct source_line *line;
288 struct source_line *line_queue = NULL;
289 int displayed = 0;
290 int line_queue_count = 0, total = 0, more = 0;
291
292 if (!syme)
293 return;
294
295 if (!syme->source)
296 lookup_sym_source(syme);
297
298 if (!syme->source)
299 return;
300
301 symbol = (struct symbol *)(syme + 1);
302 printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
303 printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
304
305 pthread_mutex_lock(&syme->source_lock);
306 line = syme->source;
307 while (line) {
308 total += line->count[sym_counter];
309 line = line->next;
310 }
311
312 line = syme->source;
313 while (line) {
314 float pcnt = 0.0;
315
316 if (!line_queue_count)
317 line_queue = line;
318 line_queue_count++;
319
320 if (line->count[sym_counter])
321 pcnt = 100.0 * line->count[sym_counter] / (float)total;
322 if (pcnt >= (float)sym_pcnt_filter) {
323 if (displayed <= print_entries)
324 show_lines(line_queue, line_queue_count, total);
325 else more++;
326 displayed += line_queue_count;
327 line_queue_count = 0;
328 line_queue = NULL;
329 } else if (line_queue_count > TRACE_COUNT) {
330 line_queue = line_queue->next;
331 line_queue_count--;
332 }
333
334 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
335 line = line->next;
336 }
337 pthread_mutex_unlock(&syme->source_lock);
338 if (more)
339 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
340 }
341
342 /*
343 * Symbols will be added here in record_ip and will get out
344 * after decayed.
345 */
346 static LIST_HEAD(active_symbols);
347 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
348
349 /*
350 * Ordering weight: count-1 * count-2 * ... / count-n
351 */
352 static double sym_weight(const struct sym_entry *sym)
353 {
354 double weight = sym->snap_count;
355 int counter;
356
357 if (!display_weighted)
358 return weight;
359
360 for (counter = 1; counter < nr_counters-1; counter++)
361 weight *= sym->count[counter];
362
363 weight /= (sym->count[counter] + 1);
364
365 return weight;
366 }
367
368 static long samples;
369 static long userspace_samples;
370 static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
371
372 static void __list_insert_active_sym(struct sym_entry *syme)
373 {
374 list_add(&syme->node, &active_symbols);
375 }
376
377 static void list_remove_active_sym(struct sym_entry *syme)
378 {
379 pthread_mutex_lock(&active_symbols_lock);
380 list_del_init(&syme->node);
381 pthread_mutex_unlock(&active_symbols_lock);
382 }
383
384 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
385 {
386 struct rb_node **p = &tree->rb_node;
387 struct rb_node *parent = NULL;
388 struct sym_entry *iter;
389
390 while (*p != NULL) {
391 parent = *p;
392 iter = rb_entry(parent, struct sym_entry, rb_node);
393
394 if (se->weight > iter->weight)
395 p = &(*p)->rb_left;
396 else
397 p = &(*p)->rb_right;
398 }
399
400 rb_link_node(&se->rb_node, parent, p);
401 rb_insert_color(&se->rb_node, tree);
402 }
403
404 static void print_sym_table(void)
405 {
406 int printed = 0, j;
407 int counter, snap = !display_weighted ? sym_counter : 0;
408 float samples_per_sec = samples/delay_secs;
409 float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
410 float sum_ksamples = 0.0;
411 struct sym_entry *syme, *n;
412 struct rb_root tmp = RB_ROOT;
413 struct rb_node *nd;
414
415 samples = userspace_samples = 0;
416
417 /* Sort the active symbols */
418 pthread_mutex_lock(&active_symbols_lock);
419 syme = list_entry(active_symbols.next, struct sym_entry, node);
420 pthread_mutex_unlock(&active_symbols_lock);
421
422 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
423 syme->snap_count = syme->count[snap];
424 if (syme->snap_count != 0) {
425 syme->weight = sym_weight(syme);
426 rb_insert_active_sym(&tmp, syme);
427 sum_ksamples += syme->snap_count;
428
429 for (j = 0; j < nr_counters; j++)
430 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
431 } else
432 list_remove_active_sym(syme);
433 }
434
435 puts(CONSOLE_CLEAR);
436
437 printf(
438 "------------------------------------------------------------------------------\n");
439 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
440 samples_per_sec,
441 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
442
443 if (nr_counters == 1 || !display_weighted) {
444 printf("%Ld", (u64)attrs[0].sample_period);
445 if (freq)
446 printf("Hz ");
447 else
448 printf(" ");
449 }
450
451 if (!display_weighted)
452 printf("%s", event_name(sym_counter));
453 else for (counter = 0; counter < nr_counters; counter++) {
454 if (counter)
455 printf("/");
456
457 printf("%s", event_name(counter));
458 }
459
460 printf( "], ");
461
462 if (target_pid != -1)
463 printf(" (target_pid: %d", target_pid);
464 else
465 printf(" (all");
466
467 if (profile_cpu != -1)
468 printf(", cpu: %d)\n", profile_cpu);
469 else {
470 if (target_pid != -1)
471 printf(")\n");
472 else
473 printf(", %d CPUs)\n", nr_cpus);
474 }
475
476 printf("------------------------------------------------------------------------------\n\n");
477
478 if (sym_filter_entry) {
479 show_details(sym_filter_entry);
480 return;
481 }
482
483 if (nr_counters == 1)
484 printf(" samples pcnt");
485 else
486 printf(" weight samples pcnt");
487
488 if (verbose)
489 printf(" RIP ");
490 printf(" kernel function\n");
491 printf(" %s _______ _____",
492 nr_counters == 1 ? " " : "______");
493 if (verbose)
494 printf(" ________________");
495 printf(" _______________\n\n");
496
497 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
498 struct symbol *sym;
499 double pcnt;
500
501 syme = rb_entry(nd, struct sym_entry, rb_node);
502 sym = (struct symbol *)(syme + 1);
503
504 if (++printed > print_entries || (int)syme->snap_count < count_filter)
505 continue;
506
507 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
508 sum_ksamples));
509
510 if (nr_counters == 1 || !display_weighted)
511 printf("%20.2f - ", syme->weight);
512 else
513 printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
514
515 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
516 if (verbose)
517 printf(" - %016llx", sym->start);
518 printf(" : %s", sym->name);
519 if (sym->module)
520 printf("\t[%s]", sym->module->name);
521 printf("\n");
522 }
523 }
524
525 static void prompt_integer(int *target, const char *msg)
526 {
527 char *buf = malloc(0), *p;
528 size_t dummy = 0;
529 int tmp;
530
531 fprintf(stdout, "\n%s: ", msg);
532 if (getline(&buf, &dummy, stdin) < 0)
533 return;
534
535 p = strchr(buf, '\n');
536 if (p)
537 *p = 0;
538
539 p = buf;
540 while(*p) {
541 if (!isdigit(*p))
542 goto out_free;
543 p++;
544 }
545 tmp = strtoul(buf, NULL, 10);
546 *target = tmp;
547 out_free:
548 free(buf);
549 }
550
551 static void prompt_percent(int *target, const char *msg)
552 {
553 int tmp = 0;
554
555 prompt_integer(&tmp, msg);
556 if (tmp >= 0 && tmp <= 100)
557 *target = tmp;
558 }
559
560 static void prompt_symbol(struct sym_entry **target, const char *msg)
561 {
562 char *buf = malloc(0), *p;
563 struct sym_entry *syme = *target, *n, *found = NULL;
564 size_t dummy = 0;
565
566 /* zero counters of active symbol */
567 if (syme) {
568 pthread_mutex_lock(&syme->source_lock);
569 __zero_source_counters(syme);
570 *target = NULL;
571 pthread_mutex_unlock(&syme->source_lock);
572 }
573
574 fprintf(stdout, "\n%s: ", msg);
575 if (getline(&buf, &dummy, stdin) < 0)
576 goto out_free;
577
578 p = strchr(buf, '\n');
579 if (p)
580 *p = 0;
581
582 pthread_mutex_lock(&active_symbols_lock);
583 syme = list_entry(active_symbols.next, struct sym_entry, node);
584 pthread_mutex_unlock(&active_symbols_lock);
585
586 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
587 struct symbol *sym = (struct symbol *)(syme + 1);
588
589 if (!strcmp(buf, sym->name)) {
590 found = syme;
591 break;
592 }
593 }
594
595 if (!found) {
596 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
597 sleep(1);
598 return;
599 } else
600 parse_source(found);
601
602 out_free:
603 free(buf);
604 }
605
606 static void print_mapped_keys(void)
607 {
608 char *name = NULL;
609
610 if (sym_filter_entry) {
611 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
612 name = sym->name;
613 }
614
615 fprintf(stdout, "\nMapped keys:\n");
616 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs);
617 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries);
618
619 if (nr_counters > 1)
620 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
621
622 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
623
624 if (vmlinux_name) {
625 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
626 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
627 fprintf(stdout, "\t[S] stop annotation.\n");
628 }
629
630 if (nr_counters > 1)
631 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
632
633 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
634 fprintf(stdout, "\t[qQ] quit.\n");
635 }
636
637 static int key_mapped(int c)
638 {
639 switch (c) {
640 case 'd':
641 case 'e':
642 case 'f':
643 case 'z':
644 case 'q':
645 case 'Q':
646 return 1;
647 case 'E':
648 case 'w':
649 return nr_counters > 1 ? 1 : 0;
650 case 'F':
651 case 's':
652 case 'S':
653 return vmlinux_name ? 1 : 0;
654 default:
655 break;
656 }
657
658 return 0;
659 }
660
661 static void handle_keypress(int c)
662 {
663 if (!key_mapped(c)) {
664 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
665 struct termios tc, save;
666
667 print_mapped_keys();
668 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
669 fflush(stdout);
670
671 tcgetattr(0, &save);
672 tc = save;
673 tc.c_lflag &= ~(ICANON | ECHO);
674 tc.c_cc[VMIN] = 0;
675 tc.c_cc[VTIME] = 0;
676 tcsetattr(0, TCSANOW, &tc);
677
678 poll(&stdin_poll, 1, -1);
679 c = getc(stdin);
680
681 tcsetattr(0, TCSAFLUSH, &save);
682 if (!key_mapped(c))
683 return;
684 }
685
686 switch (c) {
687 case 'd':
688 prompt_integer(&delay_secs, "Enter display delay");
689 break;
690 case 'e':
691 prompt_integer(&print_entries, "Enter display entries (lines)");
692 break;
693 case 'E':
694 if (nr_counters > 1) {
695 int i;
696
697 fprintf(stderr, "\nAvailable events:");
698 for (i = 0; i < nr_counters; i++)
699 fprintf(stderr, "\n\t%d %s", i, event_name(i));
700
701 prompt_integer(&sym_counter, "Enter details event counter");
702
703 if (sym_counter >= nr_counters) {
704 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
705 sym_counter = 0;
706 sleep(1);
707 }
708 } else sym_counter = 0;
709 break;
710 case 'f':
711 prompt_integer(&count_filter, "Enter display event count filter");
712 break;
713 case 'F':
714 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
715 break;
716 case 'q':
717 case 'Q':
718 printf("exiting.\n");
719 exit(0);
720 case 's':
721 prompt_symbol(&sym_filter_entry, "Enter details symbol");
722 break;
723 case 'S':
724 if (!sym_filter_entry)
725 break;
726 else {
727 struct sym_entry *syme = sym_filter_entry;
728
729 pthread_mutex_lock(&syme->source_lock);
730 sym_filter_entry = NULL;
731 __zero_source_counters(syme);
732 pthread_mutex_unlock(&syme->source_lock);
733 }
734 break;
735 case 'w':
736 display_weighted = ~display_weighted;
737 break;
738 case 'z':
739 zero = ~zero;
740 break;
741 default:
742 break;
743 }
744 }
745
746 static void *display_thread(void *arg __used)
747 {
748 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
749 struct termios tc, save;
750 int delay_msecs, c;
751
752 tcgetattr(0, &save);
753 tc = save;
754 tc.c_lflag &= ~(ICANON | ECHO);
755 tc.c_cc[VMIN] = 0;
756 tc.c_cc[VTIME] = 0;
757
758 repeat:
759 delay_msecs = delay_secs * 1000;
760 tcsetattr(0, TCSANOW, &tc);
761 /* trash return*/
762 getc(stdin);
763
764 do {
765 print_sym_table();
766 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
767
768 c = getc(stdin);
769 tcsetattr(0, TCSAFLUSH, &save);
770
771 handle_keypress(c);
772 goto repeat;
773
774 return NULL;
775 }
776
777 /* Tag samples to be skipped. */
778 static const char *skip_symbols[] = {
779 "default_idle",
780 "cpu_idle",
781 "enter_idle",
782 "exit_idle",
783 "mwait_idle",
784 "mwait_idle_with_hints",
785 "poll_idle",
786 "ppc64_runlatch_off",
787 "pseries_dedicated_idle_sleep",
788 NULL
789 };
790
791 static int symbol_filter(struct dso *self, struct symbol *sym)
792 {
793 struct sym_entry *syme;
794 const char *name = sym->name;
795 int i;
796
797 /*
798 * ppc64 uses function descriptors and appends a '.' to the
799 * start of every instruction address. Remove it.
800 */
801 if (name[0] == '.')
802 name++;
803
804 if (!strcmp(name, "_text") ||
805 !strcmp(name, "_etext") ||
806 !strcmp(name, "_sinittext") ||
807 !strncmp("init_module", name, 11) ||
808 !strncmp("cleanup_module", name, 14) ||
809 strstr(name, "_text_start") ||
810 strstr(name, "_text_end"))
811 return 1;
812
813 syme = dso__sym_priv(self, sym);
814 pthread_mutex_init(&syme->source_lock, NULL);
815 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
816 sym_filter_entry = syme;
817
818 for (i = 0; skip_symbols[i]; i++) {
819 if (!strcmp(skip_symbols[i], name)) {
820 syme->skip = 1;
821 break;
822 }
823 }
824
825 return 0;
826 }
827
828 static int parse_symbols(void)
829 {
830 struct rb_node *node;
831 struct symbol *sym;
832 int use_modules = vmlinux_name ? 1 : 0;
833
834 kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
835 if (kernel_dso == NULL)
836 return -1;
837
838 if (dso__load_kernel(kernel_dso, vmlinux_name, symbol_filter, verbose, use_modules) <= 0)
839 goto out_delete_dso;
840
841 node = rb_first(&kernel_dso->syms);
842 sym = rb_entry(node, struct symbol, rb_node);
843 min_ip = sym->start;
844
845 node = rb_last(&kernel_dso->syms);
846 sym = rb_entry(node, struct symbol, rb_node);
847 max_ip = sym->end;
848
849 if (dump_symtab)
850 dso__fprintf(kernel_dso, stderr);
851
852 return 0;
853
854 out_delete_dso:
855 dso__delete(kernel_dso);
856 kernel_dso = NULL;
857 return -1;
858 }
859
860 /*
861 * Binary search in the histogram table and record the hit:
862 */
863 static void record_ip(u64 ip, int counter)
864 {
865 struct symbol *sym = dso__find_symbol(kernel_dso, ip);
866
867 if (sym != NULL) {
868 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
869
870 if (!syme->skip) {
871 syme->count[counter]++;
872 record_precise_ip(syme, counter, ip);
873 pthread_mutex_lock(&active_symbols_lock);
874 if (list_empty(&syme->node) || !syme->node.next)
875 __list_insert_active_sym(syme);
876 pthread_mutex_unlock(&active_symbols_lock);
877 return;
878 }
879 }
880
881 samples--;
882 }
883
884 static void process_event(u64 ip, int counter, int user)
885 {
886 samples++;
887
888 if (user) {
889 userspace_samples++;
890 return;
891 }
892
893 record_ip(ip, counter);
894 }
895
896 struct mmap_data {
897 int counter;
898 void *base;
899 int mask;
900 unsigned int prev;
901 };
902
903 static unsigned int mmap_read_head(struct mmap_data *md)
904 {
905 struct perf_event_mmap_page *pc = md->base;
906 int head;
907
908 head = pc->data_head;
909 rmb();
910
911 return head;
912 }
913
914 struct timeval last_read, this_read;
915
916 static void mmap_read_counter(struct mmap_data *md)
917 {
918 unsigned int head = mmap_read_head(md);
919 unsigned int old = md->prev;
920 unsigned char *data = md->base + page_size;
921 int diff;
922
923 gettimeofday(&this_read, NULL);
924
925 /*
926 * If we're further behind than half the buffer, there's a chance
927 * the writer will bite our tail and mess up the samples under us.
928 *
929 * If we somehow ended up ahead of the head, we got messed up.
930 *
931 * In either case, truncate and restart at head.
932 */
933 diff = head - old;
934 if (diff > md->mask / 2 || diff < 0) {
935 struct timeval iv;
936 unsigned long msecs;
937
938 timersub(&this_read, &last_read, &iv);
939 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
940
941 fprintf(stderr, "WARNING: failed to keep up with mmap data."
942 " Last read %lu msecs ago.\n", msecs);
943
944 /*
945 * head points to a known good entry, start there.
946 */
947 old = head;
948 }
949
950 last_read = this_read;
951
952 for (; old != head;) {
953 event_t *event = (event_t *)&data[old & md->mask];
954
955 event_t event_copy;
956
957 size_t size = event->header.size;
958
959 /*
960 * Event straddles the mmap boundary -- header should always
961 * be inside due to u64 alignment of output.
962 */
963 if ((old & md->mask) + size != ((old + size) & md->mask)) {
964 unsigned int offset = old;
965 unsigned int len = min(sizeof(*event), size), cpy;
966 void *dst = &event_copy;
967
968 do {
969 cpy = min(md->mask + 1 - (offset & md->mask), len);
970 memcpy(dst, &data[offset & md->mask], cpy);
971 offset += cpy;
972 dst += cpy;
973 len -= cpy;
974 } while (len);
975
976 event = &event_copy;
977 }
978
979 old += size;
980
981 if (event->header.type == PERF_RECORD_SAMPLE) {
982 int user =
983 (event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
984 process_event(event->ip.ip, md->counter, user);
985 }
986 }
987
988 md->prev = old;
989 }
990
991 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
992 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
993
994 static void mmap_read(void)
995 {
996 int i, counter;
997
998 for (i = 0; i < nr_cpus; i++) {
999 for (counter = 0; counter < nr_counters; counter++)
1000 mmap_read_counter(&mmap_array[i][counter]);
1001 }
1002 }
1003
1004 int nr_poll;
1005 int group_fd;
1006
1007 static void start_counter(int i, int counter)
1008 {
1009 struct perf_event_attr *attr;
1010 int cpu;
1011
1012 cpu = profile_cpu;
1013 if (target_pid == -1 && profile_cpu == -1)
1014 cpu = i;
1015
1016 attr = attrs + counter;
1017
1018 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1019 attr->freq = freq;
1020 attr->inherit = (cpu < 0) && inherit;
1021
1022 try_again:
1023 fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
1024
1025 if (fd[i][counter] < 0) {
1026 int err = errno;
1027
1028 if (err == EPERM)
1029 die("No permission - are you root?\n");
1030 /*
1031 * If it's cycles then fall back to hrtimer
1032 * based cpu-clock-tick sw counter, which
1033 * is always available even if no PMU support:
1034 */
1035 if (attr->type == PERF_TYPE_HARDWARE
1036 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1037
1038 if (verbose)
1039 warning(" ... trying to fall back to cpu-clock-ticks\n");
1040
1041 attr->type = PERF_TYPE_SOFTWARE;
1042 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1043 goto try_again;
1044 }
1045 printf("\n");
1046 error("perfcounter syscall returned with %d (%s)\n",
1047 fd[i][counter], strerror(err));
1048 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1049 exit(-1);
1050 }
1051 assert(fd[i][counter] >= 0);
1052 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1053
1054 /*
1055 * First counter acts as the group leader:
1056 */
1057 if (group && group_fd == -1)
1058 group_fd = fd[i][counter];
1059
1060 event_array[nr_poll].fd = fd[i][counter];
1061 event_array[nr_poll].events = POLLIN;
1062 nr_poll++;
1063
1064 mmap_array[i][counter].counter = counter;
1065 mmap_array[i][counter].prev = 0;
1066 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1067 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1068 PROT_READ, MAP_SHARED, fd[i][counter], 0);
1069 if (mmap_array[i][counter].base == MAP_FAILED)
1070 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1071 }
1072
1073 static int __cmd_top(void)
1074 {
1075 pthread_t thread;
1076 int i, counter;
1077 int ret;
1078
1079 for (i = 0; i < nr_cpus; i++) {
1080 group_fd = -1;
1081 for (counter = 0; counter < nr_counters; counter++)
1082 start_counter(i, counter);
1083 }
1084
1085 /* Wait for a minimal set of events before starting the snapshot */
1086 poll(event_array, nr_poll, 100);
1087
1088 mmap_read();
1089
1090 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1091 printf("Could not create display thread.\n");
1092 exit(-1);
1093 }
1094
1095 if (realtime_prio) {
1096 struct sched_param param;
1097
1098 param.sched_priority = realtime_prio;
1099 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1100 printf("Could not set realtime priority.\n");
1101 exit(-1);
1102 }
1103 }
1104
1105 while (1) {
1106 int hits = samples;
1107
1108 mmap_read();
1109
1110 if (hits == samples)
1111 ret = poll(event_array, nr_poll, 100);
1112 }
1113
1114 return 0;
1115 }
1116
1117 static const char * const top_usage[] = {
1118 "perf top [<options>]",
1119 NULL
1120 };
1121
1122 static const struct option options[] = {
1123 OPT_CALLBACK('e', "event", NULL, "event",
1124 "event selector. use 'perf list' to list available events",
1125 parse_events),
1126 OPT_INTEGER('c', "count", &default_interval,
1127 "event period to sample"),
1128 OPT_INTEGER('p', "pid", &target_pid,
1129 "profile events on existing pid"),
1130 OPT_BOOLEAN('a', "all-cpus", &system_wide,
1131 "system-wide collection from all CPUs"),
1132 OPT_INTEGER('C', "CPU", &profile_cpu,
1133 "CPU to profile on"),
1134 OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
1135 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1136 "number of mmap data pages"),
1137 OPT_INTEGER('r', "realtime", &realtime_prio,
1138 "collect data with this RT SCHED_FIFO priority"),
1139 OPT_INTEGER('d', "delay", &delay_secs,
1140 "number of seconds to delay between refreshes"),
1141 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1142 "dump the symbol table used for profiling"),
1143 OPT_INTEGER('f', "count-filter", &count_filter,
1144 "only display functions with more events than this"),
1145 OPT_BOOLEAN('g', "group", &group,
1146 "put the counters into a counter group"),
1147 OPT_BOOLEAN('i', "inherit", &inherit,
1148 "child tasks inherit counters"),
1149 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1150 "symbol to annotate - requires -k option"),
1151 OPT_BOOLEAN('z', "zero", &zero,
1152 "zero history across updates"),
1153 OPT_INTEGER('F', "freq", &freq,
1154 "profile at this frequency"),
1155 OPT_INTEGER('E', "entries", &print_entries,
1156 "display this many functions"),
1157 OPT_BOOLEAN('v', "verbose", &verbose,
1158 "be more verbose (show counter open errors, etc)"),
1159 OPT_END()
1160 };
1161
1162 int cmd_top(int argc, const char **argv, const char *prefix __used)
1163 {
1164 int counter;
1165
1166 symbol__init();
1167
1168 page_size = sysconf(_SC_PAGE_SIZE);
1169
1170 argc = parse_options(argc, argv, options, top_usage, 0);
1171 if (argc)
1172 usage_with_options(top_usage, options);
1173
1174 if (freq) {
1175 default_interval = freq;
1176 freq = 1;
1177 }
1178
1179 /* CPU and PID are mutually exclusive */
1180 if (target_pid != -1 && profile_cpu != -1) {
1181 printf("WARNING: PID switch overriding CPU\n");
1182 sleep(1);
1183 profile_cpu = -1;
1184 }
1185
1186 if (!nr_counters)
1187 nr_counters = 1;
1188
1189 if (delay_secs < 1)
1190 delay_secs = 1;
1191
1192 parse_symbols();
1193 parse_source(sym_filter_entry);
1194
1195 /*
1196 * Fill in the ones not specifically initialized via -c:
1197 */
1198 for (counter = 0; counter < nr_counters; counter++) {
1199 if (attrs[counter].sample_period)
1200 continue;
1201
1202 attrs[counter].sample_period = default_interval;
1203 }
1204
1205 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1206 assert(nr_cpus <= MAX_NR_CPUS);
1207 assert(nr_cpus >= 0);
1208
1209 if (target_pid != -1 || profile_cpu != -1)
1210 nr_cpus = 1;
1211
1212 return __cmd_top();
1213 }
Linux kernel - Deliverables
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