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perf_counter: add sample user-space to Documentation/perf_counter/
[linux-2.6/verdex.git] / Documentation / perf_counter / kerneltop.c
blobcf0e30bab5d56e663658ff43bf53d4f75b2d0226
1 /*
2 * kerneltop.c: show top kernel functions - performance counters showcase
3
4 Build with:
5
6 cc -O6 -Wall `pkg-config --cflags --libs glib-2.0` -o kerneltop kerneltop.c
7
8 Sample output:
9
10 ------------------------------------------------------------------------------
11 KernelTop: 2669 irqs/sec [NMI, cache-misses/cache-refs], (all, cpu: 2)
12 ------------------------------------------------------------------------------
13
14 weight RIP kernel function
15 ______ ________________ _______________
16
17 35.20 - ffffffff804ce74b : skb_copy_and_csum_dev
18 33.00 - ffffffff804cb740 : sock_alloc_send_skb
19 31.26 - ffffffff804ce808 : skb_push
20 22.43 - ffffffff80510004 : tcp_established_options
21 19.00 - ffffffff8027d250 : find_get_page
22 15.76 - ffffffff804e4fc9 : eth_type_trans
23 15.20 - ffffffff804d8baa : dst_release
24 14.86 - ffffffff804cf5d8 : skb_release_head_state
25 14.00 - ffffffff802217d5 : read_hpet
26 12.00 - ffffffff804ffb7f : __ip_local_out
27 11.97 - ffffffff804fc0c8 : ip_local_deliver_finish
28 8.54 - ffffffff805001a3 : ip_queue_xmit
29
30 Started by Ingo Molnar <mingo@redhat.com>
31
32 Improvements and fixes by:
33
34 Arjan van de Ven <arjan@linux.intel.com>
35 Yanmin Zhang <yanmin.zhang@intel.com>
36 Mike Galbraith <efault@gmx.de>
37
38 Released under the GPL v2. (and only v2, not any later version)
39
40 */
41 #define _GNU_SOURCE
42 #include <sys/types.h>
43 #include <sys/stat.h>
44 #include <sys/time.h>
45 #include <unistd.h>
46 #include <stdint.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <getopt.h>
50 #include <assert.h>
51 #include <fcntl.h>
52 #include <stdio.h>
53 #include <errno.h>
54 #include <ctype.h>
55 #include <time.h>
56
57 #include <glib.h>
58
59 #include <sys/syscall.h>
60 #include <sys/ioctl.h>
61 #include <sys/poll.h>
62 #include <sys/prctl.h>
63 #include <sys/wait.h>
64 #include <sys/uio.h>
65
66 #include <linux/unistd.h>
67
68 #ifdef __x86_64__
69 # define __NR_perf_counter_open 295
70 #endif
71
72 #ifdef __i386__
73 # define __NR_perf_counter_open 333
74 #endif
75
76 /*
77 * Pick up some kernel type conventions:
78 */
79 #define __user
80 #define asmlinkage
81
82 typedef unsigned int __u32;
83 typedef unsigned long long __u64;
84 typedef long long __s64;
85
86 /*
87 * User-space ABI bits:
88 */
89
90 /*
91 * Generalized performance counter event types, used by the hw_event.type
92 * parameter of the sys_perf_counter_open() syscall:
93 */
94 enum hw_event_types {
95 /*
96 * Common hardware events, generalized by the kernel:
97 */
98 PERF_COUNT_CPU_CYCLES = 0,
99 PERF_COUNT_INSTRUCTIONS = 1,
100 PERF_COUNT_CACHE_REFERENCES = 2,
101 PERF_COUNT_CACHE_MISSES = 3,
102 PERF_COUNT_BRANCH_INSTRUCTIONS = 4,
103 PERF_COUNT_BRANCH_MISSES = 5,
104 PERF_COUNT_BUS_CYCLES = 6,
105
106 PERF_HW_EVENTS_MAX = 7,
107
108 /*
109 * Special "software" counters provided by the kernel, even if
110 * the hardware does not support performance counters. These
111 * counters measure various physical and sw events of the
112 * kernel (and allow the profiling of them as well):
113 */
114 PERF_COUNT_CPU_CLOCK = -1,
115 PERF_COUNT_TASK_CLOCK = -2,
116 PERF_COUNT_PAGE_FAULTS = -3,
117 PERF_COUNT_CONTEXT_SWITCHES = -4,
118 PERF_COUNT_CPU_MIGRATIONS = -5,
119
120 PERF_SW_EVENTS_MIN = -6,
121 };
122
123 /*
124 * IRQ-notification data record type:
125 */
126 enum perf_counter_record_type {
127 PERF_RECORD_SIMPLE = 0,
128 PERF_RECORD_IRQ = 1,
129 PERF_RECORD_GROUP = 2,
130 };
131
132 /*
133 * Hardware event to monitor via a performance monitoring counter:
134 */
135 struct perf_counter_hw_event {
136 __s64 type;
137
138 __u64 irq_period;
139 __u64 record_type;
140 __u64 read_format;
141
142 __u64 disabled : 1, /* off by default */
143 nmi : 1, /* NMI sampling */
144 raw : 1, /* raw event type */
145 inherit : 1, /* children inherit it */
146 pinned : 1, /* must always be on PMU */
147 exclusive : 1, /* only group on PMU */
148 exclude_user : 1, /* don't count user */
149 exclude_kernel : 1, /* ditto kernel */
150 exclude_hv : 1, /* ditto hypervisor */
151 exclude_idle : 1, /* don't count when idle */
152
153 __reserved_1 : 54;
154
155 __u32 extra_config_len;
156 __u32 __reserved_4;
157
158 __u64 __reserved_2;
159 __u64 __reserved_3;
160 };
161
162 /*
163 * Ioctls that can be done on a perf counter fd:
164 */
165 #define PERF_COUNTER_IOC_ENABLE _IO('$', 0)
166 #define PERF_COUNTER_IOC_DISABLE _IO('$', 1)
167
168 asmlinkage int sys_perf_counter_open(
169
170 struct perf_counter_hw_event *hw_event_uptr __user,
171 pid_t pid,
172 int cpu,
173 int group_fd,
174 unsigned long flags)
175 {
176 int ret;
177
178 ret = syscall(
179 __NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags);
180 #if defined(__x86_64__) || defined(__i386__)
181 if (ret < 0 && ret > -4096) {
182 errno = -ret;
183 ret = -1;
184 }
185 #endif
186 return ret;
187 }
188
189 const char *event_types [] = {
190 "CPU cycles",
191 "instructions",
192 "cache-refs",
193 "cache-misses",
194 "branches",
195 "branch-misses",
196 "bus cycles"
197 };
198
199 const unsigned int default_count[] = {
200 1000000,
201 1000000,
202 10000,
203 10000,
204 1000000,
205 10000,
206 };
207
208 /*
209 * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
210 * counters in the current task.
211 */
212 #define PR_TASK_PERF_COUNTERS_DISABLE 31
213 #define PR_TASK_PERF_COUNTERS_ENABLE 32
214
215 #define MAX_COUNTERS 8
216
217 static int nr_counters = -1;
218
219 static __u64 count_filter = 100;
220
221 #define MAX_NR_CPUS 256
222
223 static int event_count[MAX_COUNTERS];
224 static unsigned long event_id[MAX_COUNTERS];
225 static int event_raw[MAX_COUNTERS];
226
227 static int tid = -1;
228 static int profile_cpu = -1;
229 static int nr_cpus = 0;
230 static int nmi = 1;
231 static int group = 0;
232
233 static char *vmlinux;
234
235 static char *sym_filter;
236 static unsigned long filter_start;
237 static unsigned long filter_end;
238
239 static int delay_secs = 2;
240 static int zero;
241 static int dump_symtab;
242
243 struct source_line {
244 uint64_t EIP;
245 unsigned long count;
246 char *line;
247 };
248
249 static GList *lines;
250
251 static void display_help(void)
252 {
253 printf(
254 "Usage: kerneltop [<options>]\n\n"
255 "KernelTop Options (up to %d event types can be specified at once):\n\n",
256 MAX_COUNTERS);
257 printf(
258 " -e EID --event_id=EID # event type ID [default: 0]\n"
259 " 0: CPU cycles\n"
260 " 1: instructions\n"
261 " 2: cache accesses\n"
262 " 3: cache misses\n"
263 " 4: branch instructions\n"
264 " 5: branch prediction misses\n"
265 " 6: bus cycles\n\n"
266 " rNNN: raw PMU events (eventsel+umask)\n\n"
267 " -c CNT --count=CNT # event period to sample\n\n"
268 " -C CPU --cpu=CPU # CPU (-1 for all) [default: -1]\n"
269 " -p PID --pid=PID # PID of sampled task (-1 for all) [default: -1]\n\n"
270 " -d delay --delay=<seconds> # sampling/display delay [default: 2]\n"
271 " -f CNT --filter=CNT # min-event-count filter [default: 100]\n\n"
272 " -s symbol --symbol=<symbol> # function to be showed annotated one-shot\n"
273 " -x path --vmlinux=<path> # the vmlinux binary, required for -s use:\n"
274 " -z --zero # zero counts after display\n"
275 " -D --dump_symtab # dump symbol table to stderr on startup\n"
276 "\n");
277
278 exit(0);
279 }
280
281 static void process_options(int argc, char *argv[])
282 {
283 int error = 0, counter;
284
285 for (;;) {
286 int option_index = 0;
287 /** Options for getopt */
288 static struct option long_options[] = {
289 {"count", required_argument, NULL, 'c'},
290 {"cpu", required_argument, NULL, 'C'},
291 {"delay", required_argument, NULL, 'd'},
292 {"dump_symtab", no_argument, NULL, 'D'},
293 {"event_id", required_argument, NULL, 'e'},
294 {"filter", required_argument, NULL, 'f'},
295 {"group", required_argument, NULL, 'g'},
296 {"help", no_argument, NULL, 'h'},
297 {"nmi", required_argument, NULL, 'n'},
298 {"pid", required_argument, NULL, 'p'},
299 {"vmlinux", required_argument, NULL, 'x'},
300 {"symbol", required_argument, NULL, 's'},
301 {"zero", no_argument, NULL, 'z'},
302 {NULL, 0, NULL, 0 }
303 };
304 int c = getopt_long(argc, argv, "c:C:d:De:f:g:hn:p:s:x:z",
305 long_options, &option_index);
306 if (c == -1)
307 break;
308
309 switch (c) {
310 case 'c':
311 if (nr_counters == -1)
312 nr_counters = 0;
313 event_count[nr_counters] = atoi(optarg); break;
314 case 'C':
315 /* CPU and PID are mutually exclusive */
316 if (tid != -1) {
317 printf("WARNING: CPU switch overriding PID\n");
318 sleep(1);
319 tid = -1;
320 }
321 profile_cpu = atoi(optarg); break;
322 case 'd': delay_secs = atoi(optarg); break;
323 case 'D': dump_symtab = 1; break;
324
325 case 'e':
326 nr_counters++;
327 if (nr_counters == MAX_COUNTERS) {
328 error = 1;
329 break;
330 }
331 if (*optarg == 'r') {
332 event_raw[nr_counters] = 1;
333 ++optarg;
334 }
335 event_id[nr_counters] = strtol(optarg, NULL, 16);
336 break;
337
338 case 'f': count_filter = atoi(optarg); break;
339 case 'g': group = atoi(optarg); break;
340 case 'h': display_help(); break;
341 case 'n': nmi = atoi(optarg); break;
342 case 'p':
343 /* CPU and PID are mutually exclusive */
344 if (profile_cpu != -1) {
345 printf("WARNING: PID switch overriding CPU\n");
346 sleep(1);
347 profile_cpu = -1;
348 }
349 tid = atoi(optarg); break;
350 case 's': sym_filter = strdup(optarg); break;
351 case 'x': vmlinux = strdup(optarg); break;
352 case 'z': zero = 1; break;
353 default: error = 1; break;
354 }
355 }
356 if (error)
357 display_help();
358
359 nr_counters++;
360 if (nr_counters < 1)
361 nr_counters = 1;
362
363 for (counter = 0; counter < nr_counters; counter++) {
364 if (event_count[counter])
365 continue;
366
367 if (event_id[counter] < PERF_HW_EVENTS_MAX)
368 event_count[counter] = default_count[event_id[counter]];
369 else
370 event_count[counter] = 100000;
371 }
372 }
373
374 static uint64_t min_ip;
375 static uint64_t max_ip = -1ll;
376
377 struct sym_entry {
378 unsigned long long addr;
379 char *sym;
380 unsigned long count[MAX_COUNTERS];
381 int skip;
382 GList *source;
383 };
384
385 #define MAX_SYMS 100000
386
387 static int sym_table_count;
388
389 struct sym_entry *sym_filter_entry;
390
391 static struct sym_entry sym_table[MAX_SYMS];
392
393 static void show_details(struct sym_entry *sym);
394
395 /*
396 * Ordering weight: count-1 * count-1 * ... / count-n
397 */
398 static double sym_weight(const struct sym_entry *sym)
399 {
400 double weight;
401 int counter;
402
403 weight = sym->count[0];
404
405 for (counter = 1; counter < nr_counters-1; counter++)
406 weight *= sym->count[counter];
407
408 weight /= (sym->count[counter] + 1);
409
410 return weight;
411 }
412
413 static int compare(const void *__sym1, const void *__sym2)
414 {
415 const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
416
417 return sym_weight(sym1) < sym_weight(sym2);
418 }
419
420 static time_t last_refresh;
421 static long events;
422 static long userspace_events;
423 static const char CONSOLE_CLEAR[] = "\e[H\e[2J";
424
425 static struct sym_entry tmp[MAX_SYMS];
426
427 static void print_sym_table(void)
428 {
429 int i, printed;
430 int counter;
431 float events_per_sec = events/delay_secs;
432 float kevents_per_sec = (events-userspace_events)/delay_secs;
433
434 memcpy(tmp, sym_table, sizeof(sym_table[0])*sym_table_count);
435 qsort(tmp, sym_table_count, sizeof(tmp[0]), compare);
436
437 write(1, CONSOLE_CLEAR, strlen(CONSOLE_CLEAR));
438
439 printf(
440 "------------------------------------------------------------------------------\n");
441 printf( " KernelTop:%8.0f irqs/sec kernel:%3.1f%% [%s, ",
442 events_per_sec,
443 100.0 - (100.0*((events_per_sec-kevents_per_sec)/events_per_sec)),
444 nmi ? "NMI" : "IRQ");
445
446 if (nr_counters == 1)
447 printf("%d ", event_count[0]);
448
449 for (counter = 0; counter < nr_counters; counter++) {
450 if (counter)
451 printf("/");
452
453 if (event_id[counter] < PERF_HW_EVENTS_MAX)
454 printf( "%s", event_types[event_id[counter]]);
455 else
456 printf( "raw:%04lx", event_id[counter]);
457 }
458
459 printf( "], ");
460
461 if (tid != -1)
462 printf(" (tid: %d", tid);
463 else
464 printf(" (all");
465
466 if (profile_cpu != -1)
467 printf(", cpu: %d)\n", profile_cpu);
468 else {
469 if (tid != -1)
470 printf(")\n");
471 else
472 printf(", %d CPUs)\n", nr_cpus);
473 }
474
475 printf("------------------------------------------------------------------------------\n\n");
476
477 if (nr_counters == 1)
478 printf(" events");
479 else
480 printf(" weight events");
481
482 printf(" RIP kernel function\n"
483 " ______ ______ ________________ _______________\n\n"
484 );
485
486 printed = 0;
487 for (i = 0; i < sym_table_count; i++) {
488 int count;
489
490 if (nr_counters == 1) {
491 if (printed <= 18 &&
492 tmp[i].count[0] >= count_filter) {
493 printf("%19.2f - %016llx : %s\n",
494 sym_weight(tmp + i), tmp[i].addr, tmp[i].sym);
495 printed++;
496 }
497 } else {
498 if (printed <= 18 &&
499 tmp[i].count[0] >= count_filter) {
500 printf("%8.1f %10ld - %016llx : %s\n",
501 sym_weight(tmp + i),
502 tmp[i].count[0],
503 tmp[i].addr, tmp[i].sym);
504 printed++;
505 }
506 }
507 /*
508 * Add decay to the counts:
509 */
510 for (count = 0; count < nr_counters; count++)
511 sym_table[i].count[count] = zero ? 0 : sym_table[i].count[count] * 7 / 8;
512 }
513
514 if (sym_filter_entry)
515 show_details(sym_filter_entry);
516
517 last_refresh = time(NULL);
518
519 {
520 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
521
522 if (poll(&stdin_poll, 1, 0) == 1) {
523 printf("key pressed - exiting.\n");
524 exit(0);
525 }
526 }
527 }
528
529 static int read_symbol(FILE *in, struct sym_entry *s)
530 {
531 static int filter_match = 0;
532 char *sym, stype;
533 char str[500];
534 int rc, pos;
535
536 rc = fscanf(in, "%llx %c %499s", &s->addr, &stype, str);
537 if (rc == EOF)
538 return -1;
539
540 assert(rc == 3);
541
542 /* skip until end of line: */
543 pos = strlen(str);
544 do {
545 rc = fgetc(in);
546 if (rc == '\n' || rc == EOF || pos >= 499)
547 break;
548 str[pos] = rc;
549 pos++;
550 } while (1);
551 str[pos] = 0;
552
553 sym = str;
554
555 /* Filter out known duplicates and non-text symbols. */
556 if (!strcmp(sym, "_text"))
557 return 1;
558 if (!min_ip && !strcmp(sym, "_stext"))
559 return 1;
560 if (!strcmp(sym, "_etext") || !strcmp(sym, "_sinittext"))
561 return 1;
562 if (stype != 'T' && stype != 't')
563 return 1;
564 if (!strncmp("init_module", sym, 11) || !strncmp("cleanup_module", sym, 14))
565 return 1;
566 if (strstr(sym, "_text_start") || strstr(sym, "_text_end"))
567 return 1;
568
569 s->sym = malloc(strlen(str));
570 assert(s->sym);
571
572 strcpy((char *)s->sym, str);
573 s->skip = 0;
574
575 /* Tag events to be skipped. */
576 if (!strcmp("default_idle", s->sym) || !strcmp("cpu_idle", s->sym))
577 s->skip = 1;
578 if (!strcmp("enter_idle", s->sym) || !strcmp("exit_idle", s->sym))
579 s->skip = 1;
580
581 if (filter_match == 1) {
582 filter_end = s->addr;
583 filter_match = -1;
584 if (filter_end - filter_start > 10000) {
585 printf("hm, too large filter symbol <%s> - skipping.\n",
586 sym_filter);
587 printf("symbol filter start: %016lx\n", filter_start);
588 printf(" end: %016lx\n", filter_end);
589 filter_end = filter_start = 0;
590 sym_filter = NULL;
591 sleep(1);
592 }
593 }
594 if (filter_match == 0 && sym_filter && !strcmp(s->sym, sym_filter)) {
595 filter_match = 1;
596 filter_start = s->addr;
597 }
598
599 return 0;
600 }
601
602 int compare_addr(const void *__sym1, const void *__sym2)
603 {
604 const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
605
606 return sym1->addr > sym2->addr;
607 }
608
609 static void sort_symbol_table(void)
610 {
611 int i, dups;
612
613 do {
614 qsort(sym_table, sym_table_count, sizeof(sym_table[0]), compare_addr);
615 for (i = 0, dups = 0; i < sym_table_count; i++) {
616 if (sym_table[i].addr == sym_table[i+1].addr) {
617 sym_table[i+1].addr = -1ll;
618 dups++;
619 }
620 }
621 sym_table_count -= dups;
622 } while(dups);
623 }
624
625 static void parse_symbols(void)
626 {
627 struct sym_entry *last;
628
629 FILE *kallsyms = fopen("/proc/kallsyms", "r");
630
631 if (!kallsyms) {
632 printf("Could not open /proc/kallsyms - no CONFIG_KALLSYMS_ALL=y?\n");
633 exit(-1);
634 }
635
636 while (!feof(kallsyms)) {
637 if (read_symbol(kallsyms, &sym_table[sym_table_count]) == 0) {
638 sym_table_count++;
639 assert(sym_table_count <= MAX_SYMS);
640 }
641 }
642
643 sort_symbol_table();
644 min_ip = sym_table[0].addr;
645 max_ip = sym_table[sym_table_count-1].addr;
646 last = sym_table + sym_table_count++;
647
648 last->addr = -1ll;
649 last->sym = "<end>";
650
651 if (filter_end) {
652 int count;
653 for (count=0; count < sym_table_count; count ++) {
654 if (!strcmp(sym_table[count].sym, sym_filter)) {
655 sym_filter_entry = &sym_table[count];
656 break;
657 }
658 }
659 }
660 if (dump_symtab) {
661 int i;
662
663 for (i = 0; i < sym_table_count; i++)
664 fprintf(stderr, "%llx %s\n",
665 sym_table[i].addr, sym_table[i].sym);
666 }
667 }
668
669
670 static void parse_vmlinux(char *filename)
671 {
672 FILE *file;
673 char command[PATH_MAX*2];
674 if (!filename)
675 return;
676
677 sprintf(command, "objdump --start-address=0x%016lx --stop-address=0x%016lx -dS %s", filter_start, filter_end, filename);
678
679 file = popen(command, "r");
680 if (!file)
681 return;
682
683 while (!feof(file)) {
684 struct source_line *src;
685 size_t dummy = 0;
686 char *c;
687
688 src = malloc(sizeof(struct source_line));
689 assert(src != NULL);
690 memset(src, 0, sizeof(struct source_line));
691
692 if (getline(&src->line, &dummy, file) < 0)
693 break;
694 if (!src->line)
695 break;
696
697 c = strchr(src->line, '\n');
698 if (c)
699 *c = 0;
700
701 lines = g_list_prepend(lines, src);
702
703 if (strlen(src->line)>8 && src->line[8] == ':')
704 src->EIP = strtoull(src->line, NULL, 16);
705 if (strlen(src->line)>8 && src->line[16] == ':')
706 src->EIP = strtoull(src->line, NULL, 16);
707 }
708 pclose(file);
709 lines = g_list_reverse(lines);
710 }
711
712 static void record_precise_ip(uint64_t ip)
713 {
714 struct source_line *line;
715 GList *item;
716
717 item = g_list_first(lines);
718 while (item) {
719 line = item->data;
720 if (line->EIP == ip)
721 line->count++;
722 if (line->EIP > ip)
723 break;
724 item = g_list_next(item);
725 }
726 }
727
728 static void lookup_sym_in_vmlinux(struct sym_entry *sym)
729 {
730 struct source_line *line;
731 GList *item;
732 char pattern[PATH_MAX];
733 sprintf(pattern, "<%s>:", sym->sym);
734
735 item = g_list_first(lines);
736 while (item) {
737 line = item->data;
738 if (strstr(line->line, pattern)) {
739 sym->source = item;
740 break;
741 }
742 item = g_list_next(item);
743 }
744 }
745
746 void show_lines(GList *item_queue, int item_queue_count)
747 {
748 int i;
749 struct source_line *line;
750
751 for (i = 0; i < item_queue_count; i++) {
752 line = item_queue->data;
753 printf("%8li\t%s\n", line->count, line->line);
754 item_queue = g_list_next(item_queue);
755 }
756 }
757
758 #define TRACE_COUNT 3
759
760 static void show_details(struct sym_entry *sym)
761 {
762 struct source_line *line;
763 GList *item;
764 int displayed = 0;
765 GList *item_queue = NULL;
766 int item_queue_count = 0;
767
768 if (!sym->source)
769 lookup_sym_in_vmlinux(sym);
770 if (!sym->source)
771 return;
772
773 printf("Showing details for %s\n", sym->sym);
774
775 item = sym->source;
776 while (item) {
777 line = item->data;
778 if (displayed && strstr(line->line, ">:"))
779 break;
780
781 if (!item_queue_count)
782 item_queue = item;
783 item_queue_count ++;
784
785 if (line->count >= count_filter) {
786 show_lines(item_queue, item_queue_count);
787 item_queue_count = 0;
788 item_queue = NULL;
789 } else if (item_queue_count > TRACE_COUNT) {
790 item_queue = g_list_next(item_queue);
791 item_queue_count --;
792 }
793
794 line->count = 0;
795 displayed++;
796 if (displayed > 300)
797 break;
798 item = g_list_next(item);
799 }
800 }
801
802 /*
803 * Binary search in the histogram table and record the hit:
804 */
805 static void record_ip(uint64_t ip, int counter)
806 {
807 int left_idx, middle_idx, right_idx, idx;
808 unsigned long left, middle, right;
809
810 record_precise_ip(ip);
811
812 left_idx = 0;
813 right_idx = sym_table_count-1;
814 assert(ip <= max_ip && ip >= min_ip);
815
816 while (left_idx + 1 < right_idx) {
817 middle_idx = (left_idx + right_idx) / 2;
818
819 left = sym_table[ left_idx].addr;
820 middle = sym_table[middle_idx].addr;
821 right = sym_table[ right_idx].addr;
822
823 if (!(left <= middle && middle <= right)) {
824 printf("%016lx...\n%016lx...\n%016lx\n", left, middle, right);
825 printf("%d %d %d\n", left_idx, middle_idx, right_idx);
826 }
827 assert(left <= middle && middle <= right);
828 if (!(left <= ip && ip <= right)) {
829 printf(" left: %016lx\n", left);
830 printf(" ip: %016lx\n", ip);
831 printf("right: %016lx\n", right);
832 }
833 assert(left <= ip && ip <= right);
834 /*
835 * [ left .... target .... middle .... right ]
836 * => right := middle
837 */
838 if (ip < middle) {
839 right_idx = middle_idx;
840 continue;
841 }
842 /*
843 * [ left .... middle ... target ... right ]
844 * => left := middle
845 */
846 left_idx = middle_idx;
847 }
848
849 idx = left_idx;
850
851 if (!sym_table[idx].skip)
852 sym_table[idx].count[counter]++;
853 else events--;
854 }
855
856 static void process_event(uint64_t ip, int counter)
857 {
858 events++;
859
860 if (ip < min_ip || ip > max_ip) {
861 userspace_events++;
862 return;
863 }
864
865 record_ip(ip, counter);
866 }
867
868 int main(int argc, char *argv[])
869 {
870 struct pollfd event_array[MAX_NR_CPUS][MAX_COUNTERS];
871 struct perf_counter_hw_event hw_event;
872 int fd[MAX_NR_CPUS][MAX_COUNTERS];
873 int i, counter, group_fd;
874 unsigned int cpu;
875 uint64_t ip;
876 ssize_t res;
877 int ret;
878
879 process_options(argc, argv);
880
881 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
882 if (tid != -1 || profile_cpu != -1)
883 nr_cpus = 1;
884
885 assert(nr_cpus <= MAX_NR_CPUS);
886
887 for (i = 0; i < nr_cpus; i++) {
888 group_fd = -1;
889 for (counter = 0; counter < nr_counters; counter++) {
890
891 cpu = profile_cpu;
892 if (tid == -1 && profile_cpu == -1)
893 cpu = i;
894
895 memset(&hw_event, 0, sizeof(hw_event));
896 hw_event.type = event_id[counter];
897 hw_event.raw = event_raw[counter];
898 hw_event.irq_period = event_count[counter];
899 hw_event.record_type = PERF_RECORD_IRQ;
900 hw_event.nmi = nmi;
901
902 fd[i][counter] = sys_perf_counter_open(&hw_event, tid, cpu, group_fd, 0);
903 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
904 if (fd[i][counter] < 0) {
905 printf("kerneltop error: syscall returned with %d (%s)\n",
906 fd[i][counter], strerror(-fd[i][counter]));
907 if (fd[i][counter] == -1)
908 printf("Are you root?\n");
909 exit(-1);
910 }
911 assert(fd[i][counter] >= 0);
912
913 /*
914 * First counter acts as the group leader:
915 */
916 if (group && group_fd == -1)
917 group_fd = fd[i][counter];
918
919 event_array[i][counter].fd = fd[i][counter];
920 event_array[i][counter].events = POLLIN;
921 }
922 }
923
924 parse_symbols();
925 if (vmlinux && sym_filter_entry)
926 parse_vmlinux(vmlinux);
927
928 printf("KernelTop refresh period: %d seconds\n", delay_secs);
929 last_refresh = time(NULL);
930
931 while (1) {
932 int hits = events;
933
934 for (i = 0; i < nr_cpus; i++) {
935 for (counter = 0; counter < nr_counters; counter++) {
936 res = read(fd[i][counter], (char *) &ip, sizeof(ip));
937 if (res > 0) {
938 assert(res == sizeof(ip));
939
940 process_event(ip, counter);
941 }
942 }
943 }
944
945 if (time(NULL) >= last_refresh + delay_secs) {
946 print_sym_table();
947 events = userspace_events = 0;
948 }
949
950 if (hits == events)
951 ret = poll(event_array[0], nr_cpus, 1000);
952 hits = events;
953 }
954
955 return 0;
956 }
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