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perf_events: Fix some typo in the perf events config description
[linux-2.6-block.git] / tools / perf / builtin-top.c
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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
55static int fd[MAX_NR_CPUS][MAX_COUNTERS];
56
57static int system_wide = 0;
58
59static int default_interval = 100000;
60
61static int count_filter = 5;
62static int print_entries = 15;
63
64static int target_pid = -1;
65static int inherit = 0;
66static int profile_cpu = -1;
67static int nr_cpus = 0;
68static unsigned int realtime_prio = 0;
69static int group = 0;
70static unsigned int page_size;
71static unsigned int mmap_pages = 16;
72static int freq = 0;
73
74static int delay_secs = 2;
75static int zero;
76static int dump_symtab;
77
78/*
79 * Source
80 */
81
82struct source_line {
83 u64 eip;
84 unsigned long count[MAX_COUNTERS];
85 char *line;
86 struct source_line *next;
87};
88
89static char *sym_filter = NULL;
90struct sym_entry *sym_filter_entry = NULL;
91static int sym_pcnt_filter = 5;
92static int sym_counter = 0;
93static int display_weighted = -1;
94
95/*
96 * Symbols
97 */
98
99static u64 min_ip;
100static u64 max_ip = -1ll;
101
102struct 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
119static 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);
200out_assign:
201 sym_filter_entry = syme;
202 pthread_mutex_unlock(&syme->source_lock);
203}
204
205static 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
218static 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 }
239out_unlock:
240 pthread_mutex_unlock(&syme->source_lock);
241}
242
243static 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
268static 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
284static 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 */
346static LIST_HEAD(active_symbols);
347static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
348
349/*
350 * Ordering weight: count-1 * count-2 * ... / count-n
351 */
352static 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
368static long samples;
369static long userspace_samples;
370static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
371
372static void __list_insert_active_sym(struct sym_entry *syme)
373{
374 list_add(&syme->node, &active_symbols);
375}
376
377static 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
384static 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
404static 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
525static 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;
547out_free:
548 free(buf);
549}
550
551static 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
560static 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
602out_free:
603 free(buf);
604}
605
606static 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
637static 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
661static 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 if (delay_secs < 1)
690 delay_secs = 1;
691 break;
692 case 'e':
693 prompt_integer(&print_entries, "Enter display entries (lines)");
694 break;
695 case 'E':
696 if (nr_counters > 1) {
697 int i;
698
699 fprintf(stderr, "\nAvailable events:");
700 for (i = 0; i < nr_counters; i++)
701 fprintf(stderr, "\n\t%d %s", i, event_name(i));
702
703 prompt_integer(&sym_counter, "Enter details event counter");
704
705 if (sym_counter >= nr_counters) {
706 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
707 sym_counter = 0;
708 sleep(1);
709 }
710 } else sym_counter = 0;
711 break;
712 case 'f':
713 prompt_integer(&count_filter, "Enter display event count filter");
714 break;
715 case 'F':
716 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
717 break;
718 case 'q':
719 case 'Q':
720 printf("exiting.\n");
721 exit(0);
722 case 's':
723 prompt_symbol(&sym_filter_entry, "Enter details symbol");
724 break;
725 case 'S':
726 if (!sym_filter_entry)
727 break;
728 else {
729 struct sym_entry *syme = sym_filter_entry;
730
731 pthread_mutex_lock(&syme->source_lock);
732 sym_filter_entry = NULL;
733 __zero_source_counters(syme);
734 pthread_mutex_unlock(&syme->source_lock);
735 }
736 break;
737 case 'w':
738 display_weighted = ~display_weighted;
739 break;
740 case 'z':
741 zero = ~zero;
742 break;
743 default:
744 break;
745 }
746}
747
748static void *display_thread(void *arg __used)
749{
750 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
751 struct termios tc, save;
752 int delay_msecs, c;
753
754 tcgetattr(0, &save);
755 tc = save;
756 tc.c_lflag &= ~(ICANON | ECHO);
757 tc.c_cc[VMIN] = 0;
758 tc.c_cc[VTIME] = 0;
759
760repeat:
761 delay_msecs = delay_secs * 1000;
762 tcsetattr(0, TCSANOW, &tc);
763 /* trash return*/
764 getc(stdin);
765
766 do {
767 print_sym_table();
768 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
769
770 c = getc(stdin);
771 tcsetattr(0, TCSAFLUSH, &save);
772
773 handle_keypress(c);
774 goto repeat;
775
776 return NULL;
777}
778
779/* Tag samples to be skipped. */
780static const char *skip_symbols[] = {
781 "default_idle",
782 "cpu_idle",
783 "enter_idle",
784 "exit_idle",
785 "mwait_idle",
786 "mwait_idle_with_hints",
787 "poll_idle",
788 "ppc64_runlatch_off",
789 "pseries_dedicated_idle_sleep",
790 NULL
791};
792
793static int symbol_filter(struct dso *self, struct symbol *sym)
794{
795 struct sym_entry *syme;
796 const char *name = sym->name;
797 int i;
798
799 /*
800 * ppc64 uses function descriptors and appends a '.' to the
801 * start of every instruction address. Remove it.
802 */
803 if (name[0] == '.')
804 name++;
805
806 if (!strcmp(name, "_text") ||
807 !strcmp(name, "_etext") ||
808 !strcmp(name, "_sinittext") ||
809 !strncmp("init_module", name, 11) ||
810 !strncmp("cleanup_module", name, 14) ||
811 strstr(name, "_text_start") ||
812 strstr(name, "_text_end"))
813 return 1;
814
815 syme = dso__sym_priv(self, sym);
816 pthread_mutex_init(&syme->source_lock, NULL);
817 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
818 sym_filter_entry = syme;
819
820 for (i = 0; skip_symbols[i]; i++) {
821 if (!strcmp(skip_symbols[i], name)) {
822 syme->skip = 1;
823 break;
824 }
825 }
826
827 return 0;
828}
829
830static int parse_symbols(void)
831{
832 struct rb_node *node;
833 struct symbol *sym;
834 int use_modules = vmlinux_name ? 1 : 0;
835
836 kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
837 if (kernel_dso == NULL)
838 return -1;
839
840 if (dso__load_kernel(kernel_dso, vmlinux_name, symbol_filter, verbose, use_modules) <= 0)
841 goto out_delete_dso;
842
843 node = rb_first(&kernel_dso->syms);
844 sym = rb_entry(node, struct symbol, rb_node);
845 min_ip = sym->start;
846
847 node = rb_last(&kernel_dso->syms);
848 sym = rb_entry(node, struct symbol, rb_node);
849 max_ip = sym->end;
850
851 if (dump_symtab)
852 dso__fprintf(kernel_dso, stderr);
853
854 return 0;
855
856out_delete_dso:
857 dso__delete(kernel_dso);
858 kernel_dso = NULL;
859 return -1;
860}
861
862/*
863 * Binary search in the histogram table and record the hit:
864 */
865static void record_ip(u64 ip, int counter)
866{
867 struct symbol *sym = dso__find_symbol(kernel_dso, ip);
868
869 if (sym != NULL) {
870 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
871
872 if (!syme->skip) {
873 syme->count[counter]++;
874 record_precise_ip(syme, counter, ip);
875 pthread_mutex_lock(&active_symbols_lock);
876 if (list_empty(&syme->node) || !syme->node.next)
877 __list_insert_active_sym(syme);
878 pthread_mutex_unlock(&active_symbols_lock);
879 return;
880 }
881 }
882
883 samples--;
884}
885
886static void process_event(u64 ip, int counter, int user)
887{
888 samples++;
889
890 if (user) {
891 userspace_samples++;
892 return;
893 }
894
895 record_ip(ip, counter);
896}
897
898struct mmap_data {
899 int counter;
900 void *base;
901 int mask;
902 unsigned int prev;
903};
904
905static unsigned int mmap_read_head(struct mmap_data *md)
906{
907 struct perf_event_mmap_page *pc = md->base;
908 int head;
909
910 head = pc->data_head;
911 rmb();
912
913 return head;
914}
915
916struct timeval last_read, this_read;
917
918static void mmap_read_counter(struct mmap_data *md)
919{
920 unsigned int head = mmap_read_head(md);
921 unsigned int old = md->prev;
922 unsigned char *data = md->base + page_size;
923 int diff;
924
925 gettimeofday(&this_read, NULL);
926
927 /*
928 * If we're further behind than half the buffer, there's a chance
929 * the writer will bite our tail and mess up the samples under us.
930 *
931 * If we somehow ended up ahead of the head, we got messed up.
932 *
933 * In either case, truncate and restart at head.
934 */
935 diff = head - old;
936 if (diff > md->mask / 2 || diff < 0) {
937 struct timeval iv;
938 unsigned long msecs;
939
940 timersub(&this_read, &last_read, &iv);
941 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
942
943 fprintf(stderr, "WARNING: failed to keep up with mmap data."
944 " Last read %lu msecs ago.\n", msecs);
945
946 /*
947 * head points to a known good entry, start there.
948 */
949 old = head;
950 }
951
952 last_read = this_read;
953
954 for (; old != head;) {
955 event_t *event = (event_t *)&data[old & md->mask];
956
957 event_t event_copy;
958
959 size_t size = event->header.size;
960
961 /*
962 * Event straddles the mmap boundary -- header should always
963 * be inside due to u64 alignment of output.
964 */
965 if ((old & md->mask) + size != ((old + size) & md->mask)) {
966 unsigned int offset = old;
967 unsigned int len = min(sizeof(*event), size), cpy;
968 void *dst = &event_copy;
969
970 do {
971 cpy = min(md->mask + 1 - (offset & md->mask), len);
972 memcpy(dst, &data[offset & md->mask], cpy);
973 offset += cpy;
974 dst += cpy;
975 len -= cpy;
976 } while (len);
977
978 event = &event_copy;
979 }
980
981 old += size;
982
983 if (event->header.type == PERF_RECORD_SAMPLE) {
984 int user =
985 (event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
986 process_event(event->ip.ip, md->counter, user);
987 }
988 }
989
990 md->prev = old;
991}
992
993static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
994static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
995
996static void mmap_read(void)
997{
998 int i, counter;
999
1000 for (i = 0; i < nr_cpus; i++) {
1001 for (counter = 0; counter < nr_counters; counter++)
1002 mmap_read_counter(&mmap_array[i][counter]);
1003 }
1004}
1005
1006int nr_poll;
1007int group_fd;
1008
1009static void start_counter(int i, int counter)
1010{
1011 struct perf_event_attr *attr;
1012 int cpu;
1013
1014 cpu = profile_cpu;
1015 if (target_pid == -1 && profile_cpu == -1)
1016 cpu = i;
1017
1018 attr = attrs + counter;
1019
1020 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1021 attr->freq = freq;
1022 attr->inherit = (cpu < 0) && inherit;
1023
1024try_again:
1025 fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
1026
1027 if (fd[i][counter] < 0) {
1028 int err = errno;
1029
1030 if (err == EPERM)
1031 die("No permission - are you root?\n");
1032 /*
1033 * If it's cycles then fall back to hrtimer
1034 * based cpu-clock-tick sw counter, which
1035 * is always available even if no PMU support:
1036 */
1037 if (attr->type == PERF_TYPE_HARDWARE
1038 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1039
1040 if (verbose)
1041 warning(" ... trying to fall back to cpu-clock-ticks\n");
1042
1043 attr->type = PERF_TYPE_SOFTWARE;
1044 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1045 goto try_again;
1046 }
1047 printf("\n");
1048 error("perfcounter syscall returned with %d (%s)\n",
1049 fd[i][counter], strerror(err));
1050 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1051 exit(-1);
1052 }
1053 assert(fd[i][counter] >= 0);
1054 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1055
1056 /*
1057 * First counter acts as the group leader:
1058 */
1059 if (group && group_fd == -1)
1060 group_fd = fd[i][counter];
1061
1062 event_array[nr_poll].fd = fd[i][counter];
1063 event_array[nr_poll].events = POLLIN;
1064 nr_poll++;
1065
1066 mmap_array[i][counter].counter = counter;
1067 mmap_array[i][counter].prev = 0;
1068 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1069 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1070 PROT_READ, MAP_SHARED, fd[i][counter], 0);
1071 if (mmap_array[i][counter].base == MAP_FAILED)
1072 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1073}
1074
1075static int __cmd_top(void)
1076{
1077 pthread_t thread;
1078 int i, counter;
1079 int ret;
1080
1081 for (i = 0; i < nr_cpus; i++) {
1082 group_fd = -1;
1083 for (counter = 0; counter < nr_counters; counter++)
1084 start_counter(i, counter);
1085 }
1086
1087 /* Wait for a minimal set of events before starting the snapshot */
1088 poll(event_array, nr_poll, 100);
1089
1090 mmap_read();
1091
1092 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1093 printf("Could not create display thread.\n");
1094 exit(-1);
1095 }
1096
1097 if (realtime_prio) {
1098 struct sched_param param;
1099
1100 param.sched_priority = realtime_prio;
1101 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1102 printf("Could not set realtime priority.\n");
1103 exit(-1);
1104 }
1105 }
1106
1107 while (1) {
1108 int hits = samples;
1109
1110 mmap_read();
1111
1112 if (hits == samples)
1113 ret = poll(event_array, nr_poll, 100);
1114 }
1115
1116 return 0;
1117}
1118
1119static const char * const top_usage[] = {
1120 "perf top [<options>]",
1121 NULL
1122};
1123
1124static const struct option options[] = {
1125 OPT_CALLBACK('e', "event", NULL, "event",
1126 "event selector. use 'perf list' to list available events",
1127 parse_events),
1128 OPT_INTEGER('c', "count", &default_interval,
1129 "event period to sample"),
1130 OPT_INTEGER('p', "pid", &target_pid,
1131 "profile events on existing pid"),
1132 OPT_BOOLEAN('a', "all-cpus", &system_wide,
1133 "system-wide collection from all CPUs"),
1134 OPT_INTEGER('C', "CPU", &profile_cpu,
1135 "CPU to profile on"),
1136 OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
1137 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1138 "number of mmap data pages"),
1139 OPT_INTEGER('r', "realtime", &realtime_prio,
1140 "collect data with this RT SCHED_FIFO priority"),
1141 OPT_INTEGER('d', "delay", &delay_secs,
1142 "number of seconds to delay between refreshes"),
1143 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1144 "dump the symbol table used for profiling"),
1145 OPT_INTEGER('f', "count-filter", &count_filter,
1146 "only display functions with more events than this"),
1147 OPT_BOOLEAN('g', "group", &group,
1148 "put the counters into a counter group"),
1149 OPT_BOOLEAN('i', "inherit", &inherit,
1150 "child tasks inherit counters"),
1151 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1152 "symbol to annotate - requires -k option"),
1153 OPT_BOOLEAN('z', "zero", &zero,
1154 "zero history across updates"),
1155 OPT_INTEGER('F', "freq", &freq,
1156 "profile at this frequency"),
1157 OPT_INTEGER('E', "entries", &print_entries,
1158 "display this many functions"),
1159 OPT_BOOLEAN('v', "verbose", &verbose,
1160 "be more verbose (show counter open errors, etc)"),
1161 OPT_END()
1162};
1163
1164int cmd_top(int argc, const char **argv, const char *prefix __used)
1165{
1166 int counter;
1167
1168 symbol__init();
1169
1170 page_size = sysconf(_SC_PAGE_SIZE);
1171
1172 argc = parse_options(argc, argv, options, top_usage, 0);
1173 if (argc)
1174 usage_with_options(top_usage, options);
1175
1176 if (freq) {
1177 default_interval = freq;
1178 freq = 1;
1179 }
1180
1181 /* CPU and PID are mutually exclusive */
1182 if (target_pid != -1 && profile_cpu != -1) {
1183 printf("WARNING: PID switch overriding CPU\n");
1184 sleep(1);
1185 profile_cpu = -1;
1186 }
1187
1188 if (!nr_counters)
1189 nr_counters = 1;
1190
1191 if (delay_secs < 1)
1192 delay_secs = 1;
1193
1194 parse_symbols();
1195 parse_source(sym_filter_entry);
1196
1197 /*
1198 * Fill in the ones not specifically initialized via -c:
1199 */
1200 for (counter = 0; counter < nr_counters; counter++) {
1201 if (attrs[counter].sample_period)
1202 continue;
1203
1204 attrs[counter].sample_period = default_interval;
1205 }
1206
1207 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1208 assert(nr_cpus <= MAX_NR_CPUS);
1209 assert(nr_cpus >= 0);
1210
1211 if (target_pid != -1 || profile_cpu != -1)
1212 nr_cpus = 1;
1213
1214 return __cmd_top();
1215}
Linux 6.x block layer and io_uring tree(s)