perf: Do the big rename: Performance Counters -> Performance Events
[linux-2.6.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         "ppc64_runlatch_off",
786         "pseries_dedicated_idle_sleep",
787         NULL
788 };
789
790 static int symbol_filter(struct dso *self, struct symbol *sym)
791 {
792         struct sym_entry *syme;
793         const char *name = sym->name;
794         int i;
795
796         /*
797          * ppc64 uses function descriptors and appends a '.' to the
798          * start of every instruction address. Remove it.
799          */
800         if (name[0] == '.')
801                 name++;
802
803         if (!strcmp(name, "_text") ||
804             !strcmp(name, "_etext") ||
805             !strcmp(name, "_sinittext") ||
806             !strncmp("init_module", name, 11) ||
807             !strncmp("cleanup_module", name, 14) ||
808             strstr(name, "_text_start") ||
809             strstr(name, "_text_end"))
810                 return 1;
811
812         syme = dso__sym_priv(self, sym);
813         pthread_mutex_init(&syme->source_lock, NULL);
814         if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
815                 sym_filter_entry = syme;
816
817         for (i = 0; skip_symbols[i]; i++) {
818                 if (!strcmp(skip_symbols[i], name)) {
819                         syme->skip = 1;
820                         break;
821                 }
822         }
823
824         return 0;
825 }
826
827 static int parse_symbols(void)
828 {
829         struct rb_node *node;
830         struct symbol  *sym;
831         int use_modules = vmlinux_name ? 1 : 0;
832
833         kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
834         if (kernel_dso == NULL)
835                 return -1;
836
837         if (dso__load_kernel(kernel_dso, vmlinux_name, symbol_filter, verbose, use_modules) <= 0)
838                 goto out_delete_dso;
839
840         node = rb_first(&kernel_dso->syms);
841         sym = rb_entry(node, struct symbol, rb_node);
842         min_ip = sym->start;
843
844         node = rb_last(&kernel_dso->syms);
845         sym = rb_entry(node, struct symbol, rb_node);
846         max_ip = sym->end;
847
848         if (dump_symtab)
849                 dso__fprintf(kernel_dso, stderr);
850
851         return 0;
852
853 out_delete_dso:
854         dso__delete(kernel_dso);
855         kernel_dso = NULL;
856         return -1;
857 }
858
859 /*
860  * Binary search in the histogram table and record the hit:
861  */
862 static void record_ip(u64 ip, int counter)
863 {
864         struct symbol *sym = dso__find_symbol(kernel_dso, ip);
865
866         if (sym != NULL) {
867                 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
868
869                 if (!syme->skip) {
870                         syme->count[counter]++;
871                         record_precise_ip(syme, counter, ip);
872                         pthread_mutex_lock(&active_symbols_lock);
873                         if (list_empty(&syme->node) || !syme->node.next)
874                                 __list_insert_active_sym(syme);
875                         pthread_mutex_unlock(&active_symbols_lock);
876                         return;
877                 }
878         }
879
880         samples--;
881 }
882
883 static void process_event(u64 ip, int counter, int user)
884 {
885         samples++;
886
887         if (user) {
888                 userspace_samples++;
889                 return;
890         }
891
892         record_ip(ip, counter);
893 }
894
895 struct mmap_data {
896         int                     counter;
897         void                    *base;
898         int                     mask;
899         unsigned int            prev;
900 };
901
902 static unsigned int mmap_read_head(struct mmap_data *md)
903 {
904         struct perf_event_mmap_page *pc = md->base;
905         int head;
906
907         head = pc->data_head;
908         rmb();
909
910         return head;
911 }
912
913 struct timeval last_read, this_read;
914
915 static void mmap_read_counter(struct mmap_data *md)
916 {
917         unsigned int head = mmap_read_head(md);
918         unsigned int old = md->prev;
919         unsigned char *data = md->base + page_size;
920         int diff;
921
922         gettimeofday(&this_read, NULL);
923
924         /*
925          * If we're further behind than half the buffer, there's a chance
926          * the writer will bite our tail and mess up the samples under us.
927          *
928          * If we somehow ended up ahead of the head, we got messed up.
929          *
930          * In either case, truncate and restart at head.
931          */
932         diff = head - old;
933         if (diff > md->mask / 2 || diff < 0) {
934                 struct timeval iv;
935                 unsigned long msecs;
936
937                 timersub(&this_read, &last_read, &iv);
938                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
939
940                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
941                                 "  Last read %lu msecs ago.\n", msecs);
942
943                 /*
944                  * head points to a known good entry, start there.
945                  */
946                 old = head;
947         }
948
949         last_read = this_read;
950
951         for (; old != head;) {
952                 event_t *event = (event_t *)&data[old & md->mask];
953
954                 event_t event_copy;
955
956                 size_t size = event->header.size;
957
958                 /*
959                  * Event straddles the mmap boundary -- header should always
960                  * be inside due to u64 alignment of output.
961                  */
962                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
963                         unsigned int offset = old;
964                         unsigned int len = min(sizeof(*event), size), cpy;
965                         void *dst = &event_copy;
966
967                         do {
968                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
969                                 memcpy(dst, &data[offset & md->mask], cpy);
970                                 offset += cpy;
971                                 dst += cpy;
972                                 len -= cpy;
973                         } while (len);
974
975                         event = &event_copy;
976                 }
977
978                 old += size;
979
980                 if (event->header.type == PERF_RECORD_SAMPLE) {
981                         int user =
982         (event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
983                         process_event(event->ip.ip, md->counter, user);
984                 }
985         }
986
987         md->prev = old;
988 }
989
990 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
991 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
992
993 static void mmap_read(void)
994 {
995         int i, counter;
996
997         for (i = 0; i < nr_cpus; i++) {
998                 for (counter = 0; counter < nr_counters; counter++)
999                         mmap_read_counter(&mmap_array[i][counter]);
1000         }
1001 }
1002
1003 int nr_poll;
1004 int group_fd;
1005
1006 static void start_counter(int i, int counter)
1007 {
1008         struct perf_event_attr *attr;
1009         int cpu;
1010
1011         cpu = profile_cpu;
1012         if (target_pid == -1 && profile_cpu == -1)
1013                 cpu = i;
1014
1015         attr = attrs + counter;
1016
1017         attr->sample_type       = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1018         attr->freq              = freq;
1019         attr->inherit           = (cpu < 0) && inherit;
1020
1021 try_again:
1022         fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
1023
1024         if (fd[i][counter] < 0) {
1025                 int err = errno;
1026
1027                 if (err == EPERM)
1028                         die("No permission - are you root?\n");
1029                 /*
1030                  * If it's cycles then fall back to hrtimer
1031                  * based cpu-clock-tick sw counter, which
1032                  * is always available even if no PMU support:
1033                  */
1034                 if (attr->type == PERF_TYPE_HARDWARE
1035                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1036
1037                         if (verbose)
1038                                 warning(" ... trying to fall back to cpu-clock-ticks\n");
1039
1040                         attr->type = PERF_TYPE_SOFTWARE;
1041                         attr->config = PERF_COUNT_SW_CPU_CLOCK;
1042                         goto try_again;
1043                 }
1044                 printf("\n");
1045                 error("perfcounter syscall returned with %d (%s)\n",
1046                         fd[i][counter], strerror(err));
1047                 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1048                 exit(-1);
1049         }
1050         assert(fd[i][counter] >= 0);
1051         fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1052
1053         /*
1054          * First counter acts as the group leader:
1055          */
1056         if (group && group_fd == -1)
1057                 group_fd = fd[i][counter];
1058
1059         event_array[nr_poll].fd = fd[i][counter];
1060         event_array[nr_poll].events = POLLIN;
1061         nr_poll++;
1062
1063         mmap_array[i][counter].counter = counter;
1064         mmap_array[i][counter].prev = 0;
1065         mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1066         mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1067                         PROT_READ, MAP_SHARED, fd[i][counter], 0);
1068         if (mmap_array[i][counter].base == MAP_FAILED)
1069                 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1070 }
1071
1072 static int __cmd_top(void)
1073 {
1074         pthread_t thread;
1075         int i, counter;
1076         int ret;
1077
1078         for (i = 0; i < nr_cpus; i++) {
1079                 group_fd = -1;
1080                 for (counter = 0; counter < nr_counters; counter++)
1081                         start_counter(i, counter);
1082         }
1083
1084         /* Wait for a minimal set of events before starting the snapshot */
1085         poll(event_array, nr_poll, 100);
1086
1087         mmap_read();
1088
1089         if (pthread_create(&thread, NULL, display_thread, NULL)) {
1090                 printf("Could not create display thread.\n");
1091                 exit(-1);
1092         }
1093
1094         if (realtime_prio) {
1095                 struct sched_param param;
1096
1097                 param.sched_priority = realtime_prio;
1098                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1099                         printf("Could not set realtime priority.\n");
1100                         exit(-1);
1101                 }
1102         }
1103
1104         while (1) {
1105                 int hits = samples;
1106
1107                 mmap_read();
1108
1109                 if (hits == samples)
1110                         ret = poll(event_array, nr_poll, 100);
1111         }
1112
1113         return 0;
1114 }
1115
1116 static const char * const top_usage[] = {
1117         "perf top [<options>]",
1118         NULL
1119 };
1120
1121 static const struct option options[] = {
1122         OPT_CALLBACK('e', "event", NULL, "event",
1123                      "event selector. use 'perf list' to list available events",
1124                      parse_events),
1125         OPT_INTEGER('c', "count", &default_interval,
1126                     "event period to sample"),
1127         OPT_INTEGER('p', "pid", &target_pid,
1128                     "profile events on existing pid"),
1129         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1130                             "system-wide collection from all CPUs"),
1131         OPT_INTEGER('C', "CPU", &profile_cpu,
1132                     "CPU to profile on"),
1133         OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
1134         OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1135                     "number of mmap data pages"),
1136         OPT_INTEGER('r', "realtime", &realtime_prio,
1137                     "collect data with this RT SCHED_FIFO priority"),
1138         OPT_INTEGER('d', "delay", &delay_secs,
1139                     "number of seconds to delay between refreshes"),
1140         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1141                             "dump the symbol table used for profiling"),
1142         OPT_INTEGER('f', "count-filter", &count_filter,
1143                     "only display functions with more events than this"),
1144         OPT_BOOLEAN('g', "group", &group,
1145                             "put the counters into a counter group"),
1146         OPT_BOOLEAN('i', "inherit", &inherit,
1147                     "child tasks inherit counters"),
1148         OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1149                     "symbol to annotate - requires -k option"),
1150         OPT_BOOLEAN('z', "zero", &zero,
1151                     "zero history across updates"),
1152         OPT_INTEGER('F', "freq", &freq,
1153                     "profile at this frequency"),
1154         OPT_INTEGER('E', "entries", &print_entries,
1155                     "display this many functions"),
1156         OPT_BOOLEAN('v', "verbose", &verbose,
1157                     "be more verbose (show counter open errors, etc)"),
1158         OPT_END()
1159 };
1160
1161 int cmd_top(int argc, const char **argv, const char *prefix __used)
1162 {
1163         int counter;
1164
1165         symbol__init();
1166
1167         page_size = sysconf(_SC_PAGE_SIZE);
1168
1169         argc = parse_options(argc, argv, options, top_usage, 0);
1170         if (argc)
1171                 usage_with_options(top_usage, options);
1172
1173         if (freq) {
1174                 default_interval = freq;
1175                 freq = 1;
1176         }
1177
1178         /* CPU and PID are mutually exclusive */
1179         if (target_pid != -1 && profile_cpu != -1) {
1180                 printf("WARNING: PID switch overriding CPU\n");
1181                 sleep(1);
1182                 profile_cpu = -1;
1183         }
1184
1185         if (!nr_counters)
1186                 nr_counters = 1;
1187
1188         if (delay_secs < 1)
1189                 delay_secs = 1;
1190
1191         parse_symbols();
1192         parse_source(sym_filter_entry);
1193
1194         /*
1195          * Fill in the ones not specifically initialized via -c:
1196          */
1197         for (counter = 0; counter < nr_counters; counter++) {
1198                 if (attrs[counter].sample_period)
1199                         continue;
1200
1201                 attrs[counter].sample_period = default_interval;
1202         }
1203
1204         nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1205         assert(nr_cpus <= MAX_NR_CPUS);
1206         assert(nr_cpus >= 0);
1207
1208         if (target_pid != -1 || profile_cpu != -1)
1209                 nr_cpus = 1;
1210
1211         return __cmd_top();
1212 }