?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
KVM: Prevent kvm_init from corrupting debugfs structures
[linux-2.6/verdex.git] / tools / perf / builtin-top.c
blob7de28ce9ca260b8610a2e3f30858de1ed413eb15
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 <assert.h>
31 #include <fcntl.h>
32
33 #include <stdio.h>
34 #include <termios.h>
35 #include <unistd.h>
36
37 #include <errno.h>
38 #include <time.h>
39 #include <sched.h>
40 #include <pthread.h>
41
42 #include <sys/syscall.h>
43 #include <sys/ioctl.h>
44 #include <sys/poll.h>
45 #include <sys/prctl.h>
46 #include <sys/wait.h>
47 #include <sys/uio.h>
48 #include <sys/mman.h>
49
50 #include <linux/unistd.h>
51 #include <linux/types.h>
52
53 static int fd[MAX_NR_CPUS][MAX_COUNTERS];
54
55 static int system_wide = 0;
56
57 static int default_interval = 100000;
58
59 static int count_filter = 5;
60 static int print_entries = 15;
61
62 static int target_pid = -1;
63 static int inherit = 0;
64 static int profile_cpu = -1;
65 static int nr_cpus = 0;
66 static unsigned int realtime_prio = 0;
67 static int group = 0;
68 static unsigned int page_size;
69 static unsigned int mmap_pages = 16;
70 static int freq = 0;
71 static int verbose = 0;
72 static char *vmlinux = NULL;
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], *path = vmlinux;
126 u64 start, end, len;
127
128 if (!syme)
129 return;
130
131 if (syme->lines) {
132 pthread_mutex_lock(&syme->source_lock);
133 goto out_assign;
134 }
135
136 sym = (struct symbol *)(syme + 1);
137 module = sym->module;
138
139 if (module)
140 path = module->path;
141 if (!path)
142 return;
143
144 start = sym->obj_start;
145 if (!start)
146 start = sym->start;
147
148 if (module) {
149 section = module->sections->find_section(module->sections, ".text");
150 if (section)
151 start -= section->vma;
152 }
153
154 end = start + sym->end - sym->start + 1;
155 len = sym->end - sym->start;
156
157 sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", start, end, path);
158
159 file = popen(command, "r");
160 if (!file)
161 return;
162
163 pthread_mutex_lock(&syme->source_lock);
164 syme->lines_tail = &syme->lines;
165 while (!feof(file)) {
166 struct source_line *src;
167 size_t dummy = 0;
168 char *c;
169
170 src = malloc(sizeof(struct source_line));
171 assert(src != NULL);
172 memset(src, 0, sizeof(struct source_line));
173
174 if (getline(&src->line, &dummy, file) < 0)
175 break;
176 if (!src->line)
177 break;
178
179 c = strchr(src->line, '\n');
180 if (c)
181 *c = 0;
182
183 src->next = NULL;
184 *syme->lines_tail = src;
185 syme->lines_tail = &src->next;
186
187 if (strlen(src->line)>8 && src->line[8] == ':') {
188 src->eip = strtoull(src->line, NULL, 16);
189 if (section)
190 src->eip += section->vma;
191 }
192 if (strlen(src->line)>8 && src->line[16] == ':') {
193 src->eip = strtoull(src->line, NULL, 16);
194 if (section)
195 src->eip += section->vma;
196 }
197 }
198 pclose(file);
199 out_assign:
200 sym_filter_entry = syme;
201 pthread_mutex_unlock(&syme->source_lock);
202 }
203
204 static void __zero_source_counters(struct sym_entry *syme)
205 {
206 int i;
207 struct source_line *line;
208
209 line = syme->lines;
210 while (line) {
211 for (i = 0; i < nr_counters; i++)
212 line->count[i] = 0;
213 line = line->next;
214 }
215 }
216
217 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
218 {
219 struct source_line *line;
220
221 if (syme != sym_filter_entry)
222 return;
223
224 if (pthread_mutex_trylock(&syme->source_lock))
225 return;
226
227 if (!syme->source)
228 goto out_unlock;
229
230 for (line = syme->lines; line; line = line->next) {
231 if (line->eip == ip) {
232 line->count[counter]++;
233 break;
234 }
235 if (line->eip > ip)
236 break;
237 }
238 out_unlock:
239 pthread_mutex_unlock(&syme->source_lock);
240 }
241
242 static void lookup_sym_source(struct sym_entry *syme)
243 {
244 struct symbol *symbol = (struct symbol *)(syme + 1);
245 struct source_line *line;
246 char pattern[PATH_MAX];
247 char *idx;
248
249 sprintf(pattern, "<%s>:", symbol->name);
250
251 if (symbol->module) {
252 idx = strstr(pattern, "\t");
253 if (idx)
254 *idx = 0;
255 }
256
257 pthread_mutex_lock(&syme->source_lock);
258 for (line = syme->lines; line; line = line->next) {
259 if (strstr(line->line, pattern)) {
260 syme->source = line;
261 break;
262 }
263 }
264 pthread_mutex_unlock(&syme->source_lock);
265 }
266
267 static void show_lines(struct source_line *queue, int count, int total)
268 {
269 int i;
270 struct source_line *line;
271
272 line = queue;
273 for (i = 0; i < count; i++) {
274 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
275
276 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
277 line = line->next;
278 }
279 }
280
281 #define TRACE_COUNT 3
282
283 static void show_details(struct sym_entry *syme)
284 {
285 struct symbol *symbol;
286 struct source_line *line;
287 struct source_line *line_queue = NULL;
288 int displayed = 0;
289 int line_queue_count = 0, total = 0, more = 0;
290
291 if (!syme)
292 return;
293
294 if (!syme->source)
295 lookup_sym_source(syme);
296
297 if (!syme->source)
298 return;
299
300 symbol = (struct symbol *)(syme + 1);
301 printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
302 printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
303
304 pthread_mutex_lock(&syme->source_lock);
305 line = syme->source;
306 while (line) {
307 total += line->count[sym_counter];
308 line = line->next;
309 }
310
311 line = syme->source;
312 while (line) {
313 float pcnt = 0.0;
314
315 if (!line_queue_count)
316 line_queue = line;
317 line_queue_count++;
318
319 if (line->count[sym_counter])
320 pcnt = 100.0 * line->count[sym_counter] / (float)total;
321 if (pcnt >= (float)sym_pcnt_filter) {
322 if (displayed <= print_entries)
323 show_lines(line_queue, line_queue_count, total);
324 else more++;
325 displayed += line_queue_count;
326 line_queue_count = 0;
327 line_queue = NULL;
328 } else if (line_queue_count > TRACE_COUNT) {
329 line_queue = line_queue->next;
330 line_queue_count--;
331 }
332
333 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
334 line = line->next;
335 }
336 pthread_mutex_unlock(&syme->source_lock);
337 if (more)
338 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
339 }
340
341 struct dso *kernel_dso;
342
343 /*
344 * Symbols will be added here in record_ip and will get out
345 * after decayed.
346 */
347 static LIST_HEAD(active_symbols);
348 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
349
350 /*
351 * Ordering weight: count-1 * count-2 * ... / count-n
352 */
353 static double sym_weight(const struct sym_entry *sym)
354 {
355 double weight = sym->snap_count;
356 int counter;
357
358 if (!display_weighted)
359 return weight;
360
361 for (counter = 1; counter < nr_counters-1; counter++)
362 weight *= sym->count[counter];
363
364 weight /= (sym->count[counter] + 1);
365
366 return weight;
367 }
368
369 static long samples;
370 static long userspace_samples;
371 static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
372
373 static void __list_insert_active_sym(struct sym_entry *syme)
374 {
375 list_add(&syme->node, &active_symbols);
376 }
377
378 static void list_remove_active_sym(struct sym_entry *syme)
379 {
380 pthread_mutex_lock(&active_symbols_lock);
381 list_del_init(&syme->node);
382 pthread_mutex_unlock(&active_symbols_lock);
383 }
384
385 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
386 {
387 struct rb_node **p = &tree->rb_node;
388 struct rb_node *parent = NULL;
389 struct sym_entry *iter;
390
391 while (*p != NULL) {
392 parent = *p;
393 iter = rb_entry(parent, struct sym_entry, rb_node);
394
395 if (se->weight > iter->weight)
396 p = &(*p)->rb_left;
397 else
398 p = &(*p)->rb_right;
399 }
400
401 rb_link_node(&se->rb_node, parent, p);
402 rb_insert_color(&se->rb_node, tree);
403 }
404
405 static void print_sym_table(void)
406 {
407 int printed = 0, j;
408 int counter, snap = !display_weighted ? sym_counter : 0;
409 float samples_per_sec = samples/delay_secs;
410 float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
411 float sum_ksamples = 0.0;
412 struct sym_entry *syme, *n;
413 struct rb_root tmp = RB_ROOT;
414 struct rb_node *nd;
415
416 samples = userspace_samples = 0;
417
418 /* Sort the active symbols */
419 pthread_mutex_lock(&active_symbols_lock);
420 syme = list_entry(active_symbols.next, struct sym_entry, node);
421 pthread_mutex_unlock(&active_symbols_lock);
422
423 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
424 syme->snap_count = syme->count[snap];
425 if (syme->snap_count != 0) {
426 syme->weight = sym_weight(syme);
427 rb_insert_active_sym(&tmp, syme);
428 sum_ksamples += syme->snap_count;
429
430 for (j = 0; j < nr_counters; j++)
431 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
432 } else
433 list_remove_active_sym(syme);
434 }
435
436 puts(CONSOLE_CLEAR);
437
438 printf(
439 "------------------------------------------------------------------------------\n");
440 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
441 samples_per_sec,
442 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
443
444 if (nr_counters == 1 || !display_weighted) {
445 printf("%Ld", (u64)attrs[0].sample_period);
446 if (freq)
447 printf("Hz ");
448 else
449 printf(" ");
450 }
451
452 if (!display_weighted)
453 printf("%s", event_name(sym_counter));
454 else for (counter = 0; counter < nr_counters; counter++) {
455 if (counter)
456 printf("/");
457
458 printf("%s", event_name(counter));
459 }
460
461 printf( "], ");
462
463 if (target_pid != -1)
464 printf(" (target_pid: %d", target_pid);
465 else
466 printf(" (all");
467
468 if (profile_cpu != -1)
469 printf(", cpu: %d)\n", profile_cpu);
470 else {
471 if (target_pid != -1)
472 printf(")\n");
473 else
474 printf(", %d CPUs)\n", nr_cpus);
475 }
476
477 printf("------------------------------------------------------------------------------\n\n");
478
479 if (sym_filter_entry) {
480 show_details(sym_filter_entry);
481 return;
482 }
483
484 if (nr_counters == 1)
485 printf(" samples pcnt");
486 else
487 printf(" weight samples pcnt");
488
489 printf(" RIP kernel function\n"
490 " ______ _______ _____ ________________ _______________\n\n"
491 );
492
493 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
494 struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
495 struct symbol *sym = (struct symbol *)(syme + 1);
496 double pcnt;
497
498 if (++printed > print_entries || (int)syme->snap_count < count_filter)
499 continue;
500
501 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
502 sum_ksamples));
503
504 if (nr_counters == 1 || !display_weighted)
505 printf("%20.2f - ", syme->weight);
506 else
507 printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
508
509 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
510 printf(" - %016llx : %s", sym->start, sym->name);
511 if (sym->module)
512 printf("\t[%s]", sym->module->name);
513 printf("\n");
514 }
515 }
516
517 static void prompt_integer(int *target, const char *msg)
518 {
519 char *buf = malloc(0), *p;
520 size_t dummy = 0;
521 int tmp;
522
523 fprintf(stdout, "\n%s: ", msg);
524 if (getline(&buf, &dummy, stdin) < 0)
525 return;
526
527 p = strchr(buf, '\n');
528 if (p)
529 *p = 0;
530
531 p = buf;
532 while(*p) {
533 if (!isdigit(*p))
534 goto out_free;
535 p++;
536 }
537 tmp = strtoul(buf, NULL, 10);
538 *target = tmp;
539 out_free:
540 free(buf);
541 }
542
543 static void prompt_percent(int *target, const char *msg)
544 {
545 int tmp = 0;
546
547 prompt_integer(&tmp, msg);
548 if (tmp >= 0 && tmp <= 100)
549 *target = tmp;
550 }
551
552 static void prompt_symbol(struct sym_entry **target, const char *msg)
553 {
554 char *buf = malloc(0), *p;
555 struct sym_entry *syme = *target, *n, *found = NULL;
556 size_t dummy = 0;
557
558 /* zero counters of active symbol */
559 if (syme) {
560 pthread_mutex_lock(&syme->source_lock);
561 __zero_source_counters(syme);
562 *target = NULL;
563 pthread_mutex_unlock(&syme->source_lock);
564 }
565
566 fprintf(stdout, "\n%s: ", msg);
567 if (getline(&buf, &dummy, stdin) < 0)
568 goto out_free;
569
570 p = strchr(buf, '\n');
571 if (p)
572 *p = 0;
573
574 pthread_mutex_lock(&active_symbols_lock);
575 syme = list_entry(active_symbols.next, struct sym_entry, node);
576 pthread_mutex_unlock(&active_symbols_lock);
577
578 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
579 struct symbol *sym = (struct symbol *)(syme + 1);
580
581 if (!strcmp(buf, sym->name)) {
582 found = syme;
583 break;
584 }
585 }
586
587 if (!found) {
588 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
589 sleep(1);
590 return;
591 } else
592 parse_source(found);
593
594 out_free:
595 free(buf);
596 }
597
598 static void print_mapped_keys(void)
599 {
600 char *name = NULL;
601
602 if (sym_filter_entry) {
603 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
604 name = sym->name;
605 }
606
607 fprintf(stdout, "\nMapped keys:\n");
608 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs);
609 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries);
610
611 if (nr_counters > 1)
612 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
613
614 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
615
616 if (vmlinux) {
617 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
618 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
619 fprintf(stdout, "\t[S] stop annotation.\n");
620 }
621
622 if (nr_counters > 1)
623 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
624
625 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
626 fprintf(stdout, "\t[qQ] quit.\n");
627 }
628
629 static int key_mapped(int c)
630 {
631 switch (c) {
632 case 'd':
633 case 'e':
634 case 'f':
635 case 'z':
636 case 'q':
637 case 'Q':
638 return 1;
639 case 'E':
640 case 'w':
641 return nr_counters > 1 ? 1 : 0;
642 case 'F':
643 case 's':
644 case 'S':
645 return vmlinux ? 1 : 0;
646 }
647
648 return 0;
649 }
650
651 static void handle_keypress(int c)
652 {
653 if (!key_mapped(c)) {
654 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
655 struct termios tc, save;
656
657 print_mapped_keys();
658 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
659 fflush(stdout);
660
661 tcgetattr(0, &save);
662 tc = save;
663 tc.c_lflag &= ~(ICANON | ECHO);
664 tc.c_cc[VMIN] = 0;
665 tc.c_cc[VTIME] = 0;
666 tcsetattr(0, TCSANOW, &tc);
667
668 poll(&stdin_poll, 1, -1);
669 c = getc(stdin);
670
671 tcsetattr(0, TCSAFLUSH, &save);
672 if (!key_mapped(c))
673 return;
674 }
675
676 switch (c) {
677 case 'd':
678 prompt_integer(&delay_secs, "Enter display delay");
679 break;
680 case 'e':
681 prompt_integer(&print_entries, "Enter display entries (lines)");
682 break;
683 case 'E':
684 if (nr_counters > 1) {
685 int i;
686
687 fprintf(stderr, "\nAvailable events:");
688 for (i = 0; i < nr_counters; i++)
689 fprintf(stderr, "\n\t%d %s", i, event_name(i));
690
691 prompt_integer(&sym_counter, "Enter details event counter");
692
693 if (sym_counter >= nr_counters) {
694 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
695 sym_counter = 0;
696 sleep(1);
697 }
698 } else sym_counter = 0;
699 break;
700 case 'f':
701 prompt_integer(&count_filter, "Enter display event count filter");
702 break;
703 case 'F':
704 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
705 break;
706 case 'q':
707 case 'Q':
708 printf("exiting.\n");
709 exit(0);
710 case 's':
711 prompt_symbol(&sym_filter_entry, "Enter details symbol");
712 break;
713 case 'S':
714 if (!sym_filter_entry)
715 break;
716 else {
717 struct sym_entry *syme = sym_filter_entry;
718
719 pthread_mutex_lock(&syme->source_lock);
720 sym_filter_entry = NULL;
721 __zero_source_counters(syme);
722 pthread_mutex_unlock(&syme->source_lock);
723 }
724 break;
725 case 'w':
726 display_weighted = ~display_weighted;
727 break;
728 case 'z':
729 zero = ~zero;
730 break;
731 }
732 }
733
734 static void *display_thread(void *arg __used)
735 {
736 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
737 struct termios tc, save;
738 int delay_msecs, c;
739
740 tcgetattr(0, &save);
741 tc = save;
742 tc.c_lflag &= ~(ICANON | ECHO);
743 tc.c_cc[VMIN] = 0;
744 tc.c_cc[VTIME] = 0;
745
746 repeat:
747 delay_msecs = delay_secs * 1000;
748 tcsetattr(0, TCSANOW, &tc);
749 /* trash return*/
750 getc(stdin);
751
752 do {
753 print_sym_table();
754 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
755
756 c = getc(stdin);
757 tcsetattr(0, TCSAFLUSH, &save);
758
759 handle_keypress(c);
760 goto repeat;
761
762 return NULL;
763 }
764
765 /* Tag samples to be skipped. */
766 static const char *skip_symbols[] = {
767 "default_idle",
768 "cpu_idle",
769 "enter_idle",
770 "exit_idle",
771 "mwait_idle",
772 "mwait_idle_with_hints",
773 "ppc64_runlatch_off",
774 "pseries_dedicated_idle_sleep",
775 NULL
776 };
777
778 static int symbol_filter(struct dso *self, struct symbol *sym)
779 {
780 struct sym_entry *syme;
781 const char *name = sym->name;
782 int i;
783
784 /*
785 * ppc64 uses function descriptors and appends a '.' to the
786 * start of every instruction address. Remove it.
787 */
788 if (name[0] == '.')
789 name++;
790
791 if (!strcmp(name, "_text") ||
792 !strcmp(name, "_etext") ||
793 !strcmp(name, "_sinittext") ||
794 !strncmp("init_module", name, 11) ||
795 !strncmp("cleanup_module", name, 14) ||
796 strstr(name, "_text_start") ||
797 strstr(name, "_text_end"))
798 return 1;
799
800 syme = dso__sym_priv(self, sym);
801 pthread_mutex_init(&syme->source_lock, NULL);
802 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
803 sym_filter_entry = syme;
804
805 for (i = 0; skip_symbols[i]; i++) {
806 if (!strcmp(skip_symbols[i], name)) {
807 syme->skip = 1;
808 break;
809 }
810 }
811
812 return 0;
813 }
814
815 static int parse_symbols(void)
816 {
817 struct rb_node *node;
818 struct symbol *sym;
819 int modules = vmlinux ? 1 : 0;
820
821 kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
822 if (kernel_dso == NULL)
823 return -1;
824
825 if (dso__load_kernel(kernel_dso, vmlinux, symbol_filter, verbose, modules) <= 0)
826 goto out_delete_dso;
827
828 node = rb_first(&kernel_dso->syms);
829 sym = rb_entry(node, struct symbol, rb_node);
830 min_ip = sym->start;
831
832 node = rb_last(&kernel_dso->syms);
833 sym = rb_entry(node, struct symbol, rb_node);
834 max_ip = sym->end;
835
836 if (dump_symtab)
837 dso__fprintf(kernel_dso, stderr);
838
839 return 0;
840
841 out_delete_dso:
842 dso__delete(kernel_dso);
843 kernel_dso = NULL;
844 return -1;
845 }
846
847 /*
848 * Binary search in the histogram table and record the hit:
849 */
850 static void record_ip(u64 ip, int counter)
851 {
852 struct symbol *sym = dso__find_symbol(kernel_dso, ip);
853
854 if (sym != NULL) {
855 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
856
857 if (!syme->skip) {
858 syme->count[counter]++;
859 record_precise_ip(syme, counter, ip);
860 pthread_mutex_lock(&active_symbols_lock);
861 if (list_empty(&syme->node) || !syme->node.next)
862 __list_insert_active_sym(syme);
863 pthread_mutex_unlock(&active_symbols_lock);
864 return;
865 }
866 }
867
868 samples--;
869 }
870
871 static void process_event(u64 ip, int counter, int user)
872 {
873 samples++;
874
875 if (user) {
876 userspace_samples++;
877 return;
878 }
879
880 record_ip(ip, counter);
881 }
882
883 struct mmap_data {
884 int counter;
885 void *base;
886 int mask;
887 unsigned int prev;
888 };
889
890 static unsigned int mmap_read_head(struct mmap_data *md)
891 {
892 struct perf_counter_mmap_page *pc = md->base;
893 int head;
894
895 head = pc->data_head;
896 rmb();
897
898 return head;
899 }
900
901 struct timeval last_read, this_read;
902
903 static void mmap_read_counter(struct mmap_data *md)
904 {
905 unsigned int head = mmap_read_head(md);
906 unsigned int old = md->prev;
907 unsigned char *data = md->base + page_size;
908 int diff;
909
910 gettimeofday(&this_read, NULL);
911
912 /*
913 * If we're further behind than half the buffer, there's a chance
914 * the writer will bite our tail and mess up the samples under us.
915 *
916 * If we somehow ended up ahead of the head, we got messed up.
917 *
918 * In either case, truncate and restart at head.
919 */
920 diff = head - old;
921 if (diff > md->mask / 2 || diff < 0) {
922 struct timeval iv;
923 unsigned long msecs;
924
925 timersub(&this_read, &last_read, &iv);
926 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
927
928 fprintf(stderr, "WARNING: failed to keep up with mmap data."
929 " Last read %lu msecs ago.\n", msecs);
930
931 /*
932 * head points to a known good entry, start there.
933 */
934 old = head;
935 }
936
937 last_read = this_read;
938
939 for (; old != head;) {
940 struct ip_event {
941 struct perf_event_header header;
942 u64 ip;
943 u32 pid, target_pid;
944 };
945 struct mmap_event {
946 struct perf_event_header header;
947 u32 pid, target_pid;
948 u64 start;
949 u64 len;
950 u64 pgoff;
951 char filename[PATH_MAX];
952 };
953
954 typedef union event_union {
955 struct perf_event_header header;
956 struct ip_event ip;
957 struct mmap_event mmap;
958 } event_t;
959
960 event_t *event = (event_t *)&data[old & md->mask];
961
962 event_t event_copy;
963
964 size_t size = event->header.size;
965
966 /*
967 * Event straddles the mmap boundary -- header should always
968 * be inside due to u64 alignment of output.
969 */
970 if ((old & md->mask) + size != ((old + size) & md->mask)) {
971 unsigned int offset = old;
972 unsigned int len = min(sizeof(*event), size), cpy;
973 void *dst = &event_copy;
974
975 do {
976 cpy = min(md->mask + 1 - (offset & md->mask), len);
977 memcpy(dst, &data[offset & md->mask], cpy);
978 offset += cpy;
979 dst += cpy;
980 len -= cpy;
981 } while (len);
982
983 event = &event_copy;
984 }
985
986 old += size;
987
988 if (event->header.type == PERF_EVENT_SAMPLE) {
989 int user =
990 (event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK) == PERF_EVENT_MISC_USER;
991 process_event(event->ip.ip, md->counter, user);
992 }
993 }
994
995 md->prev = old;
996 }
997
998 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
999 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
1000
1001 static void mmap_read(void)
1002 {
1003 int i, counter;
1004
1005 for (i = 0; i < nr_cpus; i++) {
1006 for (counter = 0; counter < nr_counters; counter++)
1007 mmap_read_counter(&mmap_array[i][counter]);
1008 }
1009 }
1010
1011 int nr_poll;
1012 int group_fd;
1013
1014 static void start_counter(int i, int counter)
1015 {
1016 struct perf_counter_attr *attr;
1017 int cpu;
1018
1019 cpu = profile_cpu;
1020 if (target_pid == -1 && profile_cpu == -1)
1021 cpu = i;
1022
1023 attr = attrs + counter;
1024
1025 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1026 attr->freq = freq;
1027 attr->inherit = (cpu < 0) && inherit;
1028
1029 try_again:
1030 fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
1031
1032 if (fd[i][counter] < 0) {
1033 int err = errno;
1034
1035 if (err == EPERM)
1036 die("No permission - are you root?\n");
1037 /*
1038 * If it's cycles then fall back to hrtimer
1039 * based cpu-clock-tick sw counter, which
1040 * is always available even if no PMU support:
1041 */
1042 if (attr->type == PERF_TYPE_HARDWARE
1043 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1044
1045 if (verbose)
1046 warning(" ... trying to fall back to cpu-clock-ticks\n");
1047
1048 attr->type = PERF_TYPE_SOFTWARE;
1049 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1050 goto try_again;
1051 }
1052 printf("\n");
1053 error("perfcounter syscall returned with %d (%s)\n",
1054 fd[i][counter], strerror(err));
1055 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
1056 exit(-1);
1057 }
1058 assert(fd[i][counter] >= 0);
1059 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1060
1061 /*
1062 * First counter acts as the group leader:
1063 */
1064 if (group && group_fd == -1)
1065 group_fd = fd[i][counter];
1066
1067 event_array[nr_poll].fd = fd[i][counter];
1068 event_array[nr_poll].events = POLLIN;
1069 nr_poll++;
1070
1071 mmap_array[i][counter].counter = counter;
1072 mmap_array[i][counter].prev = 0;
1073 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1074 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1075 PROT_READ, MAP_SHARED, fd[i][counter], 0);
1076 if (mmap_array[i][counter].base == MAP_FAILED)
1077 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1078 }
1079
1080 static int __cmd_top(void)
1081 {
1082 pthread_t thread;
1083 int i, counter;
1084 int ret;
1085
1086 for (i = 0; i < nr_cpus; i++) {
1087 group_fd = -1;
1088 for (counter = 0; counter < nr_counters; counter++)
1089 start_counter(i, counter);
1090 }
1091
1092 /* Wait for a minimal set of events before starting the snapshot */
1093 poll(event_array, nr_poll, 100);
1094
1095 mmap_read();
1096
1097 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1098 printf("Could not create display thread.\n");
1099 exit(-1);
1100 }
1101
1102 if (realtime_prio) {
1103 struct sched_param param;
1104
1105 param.sched_priority = realtime_prio;
1106 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1107 printf("Could not set realtime priority.\n");
1108 exit(-1);
1109 }
1110 }
1111
1112 while (1) {
1113 int hits = samples;
1114
1115 mmap_read();
1116
1117 if (hits == samples)
1118 ret = poll(event_array, nr_poll, 100);
1119 }
1120
1121 return 0;
1122 }
1123
1124 static const char * const top_usage[] = {
1125 "perf top [<options>]",
1126 NULL
1127 };
1128
1129 static const struct option options[] = {
1130 OPT_CALLBACK('e', "event", NULL, "event",
1131 "event selector. use 'perf list' to list available events",
1132 parse_events),
1133 OPT_INTEGER('c', "count", &default_interval,
1134 "event period to sample"),
1135 OPT_INTEGER('p', "pid", &target_pid,
1136 "profile events on existing pid"),
1137 OPT_BOOLEAN('a', "all-cpus", &system_wide,
1138 "system-wide collection from all CPUs"),
1139 OPT_INTEGER('C', "CPU", &profile_cpu,
1140 "CPU to profile on"),
1141 OPT_STRING('k', "vmlinux", &vmlinux, "file", "vmlinux pathname"),
1142 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1143 "number of mmap data pages"),
1144 OPT_INTEGER('r', "realtime", &realtime_prio,
1145 "collect data with this RT SCHED_FIFO priority"),
1146 OPT_INTEGER('d', "delay", &delay_secs,
1147 "number of seconds to delay between refreshes"),
1148 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1149 "dump the symbol table used for profiling"),
1150 OPT_INTEGER('f', "count-filter", &count_filter,
1151 "only display functions with more events than this"),
1152 OPT_BOOLEAN('g', "group", &group,
1153 "put the counters into a counter group"),
1154 OPT_BOOLEAN('i', "inherit", &inherit,
1155 "child tasks inherit counters"),
1156 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1157 "symbol to annotate - requires -k option"),
1158 OPT_BOOLEAN('z', "zero", &zero,
1159 "zero history across updates"),
1160 OPT_INTEGER('F', "freq", &freq,
1161 "profile at this frequency"),
1162 OPT_INTEGER('E', "entries", &print_entries,
1163 "display this many functions"),
1164 OPT_BOOLEAN('v', "verbose", &verbose,
1165 "be more verbose (show counter open errors, etc)"),
1166 OPT_END()
1167 };
1168
1169 int cmd_top(int argc, const char **argv, const char *prefix __used)
1170 {
1171 int counter;
1172
1173 symbol__init();
1174
1175 page_size = sysconf(_SC_PAGE_SIZE);
1176
1177 argc = parse_options(argc, argv, options, top_usage, 0);
1178 if (argc)
1179 usage_with_options(top_usage, options);
1180
1181 if (freq) {
1182 default_interval = freq;
1183 freq = 1;
1184 }
1185
1186 /* CPU and PID are mutually exclusive */
1187 if (target_pid != -1 && profile_cpu != -1) {
1188 printf("WARNING: PID switch overriding CPU\n");
1189 sleep(1);
1190 profile_cpu = -1;
1191 }
1192
1193 if (!nr_counters)
1194 nr_counters = 1;
1195
1196 if (delay_secs < 1)
1197 delay_secs = 1;
1198
1199 parse_symbols();
1200 parse_source(sym_filter_entry);
1201
1202 /*
1203 * Fill in the ones not specifically initialized via -c:
1204 */
1205 for (counter = 0; counter < nr_counters; counter++) {
1206 if (attrs[counter].sample_period)
1207 continue;
1208
1209 attrs[counter].sample_period = default_interval;
1210 }
1211
1212 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1213 assert(nr_cpus <= MAX_NR_CPUS);
1214 assert(nr_cpus >= 0);
1215
1216 if (target_pid != -1 || profile_cpu != -1)
1217 nr_cpus = 1;
1218
1219 return __cmd_top();
1220 }
Verdex Pro support