4 * Builtin top command: Display a continuously updated profile of
5 * any workload, CPU or specific PID.
7 * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
9 * Improvements and fixes by:
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>
17 * Released under the GPL v2. (and only v2, not any later version)
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"
30 #include "util/debug.h"
44 #include <sys/syscall.h>
45 #include <sys/ioctl.h>
47 #include <sys/prctl.h>
52 #include <linux/unistd.h>
53 #include <linux/types.h>
55 static int fd[MAX_NR_CPUS][MAX_COUNTERS];
57 static int system_wide = 0;
59 static int default_interval = 100000;
61 static int count_filter = 5;
62 static int print_entries = 15;
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;
70 static unsigned int page_size;
71 static unsigned int mmap_pages = 16;
74 static int delay_secs = 2;
76 static int dump_symtab;
84 unsigned long count[MAX_COUNTERS];
86 struct source_line *next;
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;
100 static u64 max_ip = -1ll;
103 struct rb_node rb_node;
104 struct list_head node;
105 unsigned long count[MAX_COUNTERS];
106 unsigned long snap_count;
109 struct source_line *source;
110 struct source_line *lines;
111 struct source_line **lines_tail;
112 pthread_mutex_t source_lock;
119 static void parse_source(struct sym_entry *syme)
122 struct module *module;
123 struct section *section = NULL;
125 char command[PATH_MAX*2];
126 const char *path = vmlinux_name;
133 pthread_mutex_lock(&syme->source_lock);
137 sym = (struct symbol *)(syme + 1);
138 module = sym->module;
145 start = sym->obj_start;
150 section = module->sections->find_section(module->sections, ".text");
152 start -= section->vma;
155 end = start + sym->end - sym->start + 1;
156 len = sym->end - sym->start;
158 sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", start, end, path);
160 file = popen(command, "r");
164 pthread_mutex_lock(&syme->source_lock);
165 syme->lines_tail = &syme->lines;
166 while (!feof(file)) {
167 struct source_line *src;
171 src = malloc(sizeof(struct source_line));
173 memset(src, 0, sizeof(struct source_line));
175 if (getline(&src->line, &dummy, file) < 0)
180 c = strchr(src->line, '\n');
185 *syme->lines_tail = src;
186 syme->lines_tail = &src->next;
188 if (strlen(src->line)>8 && src->line[8] == ':') {
189 src->eip = strtoull(src->line, NULL, 16);
191 src->eip += section->vma;
193 if (strlen(src->line)>8 && src->line[16] == ':') {
194 src->eip = strtoull(src->line, NULL, 16);
196 src->eip += section->vma;
201 sym_filter_entry = syme;
202 pthread_mutex_unlock(&syme->source_lock);
205 static void __zero_source_counters(struct sym_entry *syme)
208 struct source_line *line;
212 for (i = 0; i < nr_counters; i++)
218 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
220 struct source_line *line;
222 if (syme != sym_filter_entry)
225 if (pthread_mutex_trylock(&syme->source_lock))
231 for (line = syme->lines; line; line = line->next) {
232 if (line->eip == ip) {
233 line->count[counter]++;
240 pthread_mutex_unlock(&syme->source_lock);
243 static void lookup_sym_source(struct sym_entry *syme)
245 struct symbol *symbol = (struct symbol *)(syme + 1);
246 struct source_line *line;
247 char pattern[PATH_MAX];
250 sprintf(pattern, "<%s>:", symbol->name);
252 if (symbol->module) {
253 idx = strstr(pattern, "\t");
258 pthread_mutex_lock(&syme->source_lock);
259 for (line = syme->lines; line; line = line->next) {
260 if (strstr(line->line, pattern)) {
265 pthread_mutex_unlock(&syme->source_lock);
268 static void show_lines(struct source_line *queue, int count, int total)
271 struct source_line *line;
274 for (i = 0; i < count; i++) {
275 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
277 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
282 #define TRACE_COUNT 3
284 static void show_details(struct sym_entry *syme)
286 struct symbol *symbol;
287 struct source_line *line;
288 struct source_line *line_queue = NULL;
290 int line_queue_count = 0, total = 0, more = 0;
296 lookup_sym_source(syme);
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);
305 pthread_mutex_lock(&syme->source_lock);
308 total += line->count[sym_counter];
316 if (!line_queue_count)
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);
326 displayed += line_queue_count;
327 line_queue_count = 0;
329 } else if (line_queue_count > TRACE_COUNT) {
330 line_queue = line_queue->next;
334 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
337 pthread_mutex_unlock(&syme->source_lock);
339 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
343 * Symbols will be added here in record_ip and will get out
346 static LIST_HEAD(active_symbols);
347 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
350 * Ordering weight: count-1 * count-2 * ... / count-n
352 static double sym_weight(const struct sym_entry *sym)
354 double weight = sym->snap_count;
357 if (!display_weighted)
360 for (counter = 1; counter < nr_counters-1; counter++)
361 weight *= sym->count[counter];
363 weight /= (sym->count[counter] + 1);
369 static long userspace_samples;
370 static const char CONSOLE_CLEAR[] = "
\e[H
\e[2J";
372 static void __list_insert_active_sym(struct sym_entry *syme)
374 list_add(&syme->node, &active_symbols);
377 static void list_remove_active_sym(struct sym_entry *syme)
379 pthread_mutex_lock(&active_symbols_lock);
380 list_del_init(&syme->node);
381 pthread_mutex_unlock(&active_symbols_lock);
384 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
386 struct rb_node **p = &tree->rb_node;
387 struct rb_node *parent = NULL;
388 struct sym_entry *iter;
392 iter = rb_entry(parent, struct sym_entry, rb_node);
394 if (se->weight > iter->weight)
400 rb_link_node(&se->rb_node, parent, p);
401 rb_insert_color(&se->rb_node, tree);
404 static void print_sym_table(void)
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;
415 samples = userspace_samples = 0;
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);
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;
429 for (j = 0; j < nr_counters; j++)
430 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
432 list_remove_active_sym(syme);
438 "------------------------------------------------------------------------------\n");
439 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
441 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
443 if (nr_counters == 1 || !display_weighted) {
444 printf("%Ld", (u64)attrs[0].sample_period);
451 if (!display_weighted)
452 printf("%s", event_name(sym_counter));
453 else for (counter = 0; counter < nr_counters; counter++) {
457 printf("%s", event_name(counter));
462 if (target_pid != -1)
463 printf(" (target_pid: %d", target_pid);
467 if (profile_cpu != -1)
468 printf(", cpu: %d)\n", profile_cpu);
470 if (target_pid != -1)
473 printf(", %d CPUs)\n", nr_cpus);
476 printf("------------------------------------------------------------------------------\n\n");
478 if (sym_filter_entry) {
479 show_details(sym_filter_entry);
483 if (nr_counters == 1)
484 printf(" samples pcnt");
486 printf(" weight samples pcnt");
490 printf(" kernel function\n");
491 printf(" %s _______ _____",
492 nr_counters == 1 ? " " : "______");
494 printf(" ________________");
495 printf(" _______________\n\n");
497 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
501 syme = rb_entry(nd, struct sym_entry, rb_node);
502 sym = (struct symbol *)(syme + 1);
504 if (++printed > print_entries || (int)syme->snap_count < count_filter)
507 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
510 if (nr_counters == 1 || !display_weighted)
511 printf("%20.2f - ", syme->weight);
513 printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
515 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
517 printf(" - %016llx", sym->start);
518 printf(" : %s", sym->name);
520 printf("\t[%s]", sym->module->name);
525 static void prompt_integer(int *target, const char *msg)
527 char *buf = malloc(0), *p;
531 fprintf(stdout, "\n%s: ", msg);
532 if (getline(&buf, &dummy, stdin) < 0)
535 p = strchr(buf, '\n');
545 tmp = strtoul(buf, NULL, 10);
551 static void prompt_percent(int *target, const char *msg)
555 prompt_integer(&tmp, msg);
556 if (tmp >= 0 && tmp <= 100)
560 static void prompt_symbol(struct sym_entry **target, const char *msg)
562 char *buf = malloc(0), *p;
563 struct sym_entry *syme = *target, *n, *found = NULL;
566 /* zero counters of active symbol */
568 pthread_mutex_lock(&syme->source_lock);
569 __zero_source_counters(syme);
571 pthread_mutex_unlock(&syme->source_lock);
574 fprintf(stdout, "\n%s: ", msg);
575 if (getline(&buf, &dummy, stdin) < 0)
578 p = strchr(buf, '\n');
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);
586 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
587 struct symbol *sym = (struct symbol *)(syme + 1);
589 if (!strcmp(buf, sym->name)) {
596 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
606 static void print_mapped_keys(void)
610 if (sym_filter_entry) {
611 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
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);
620 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
622 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
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");
631 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
633 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
634 fprintf(stdout, "\t[qQ] quit.\n");
637 static int key_mapped(int c)
649 return nr_counters > 1 ? 1 : 0;
653 return vmlinux_name ? 1 : 0;
661 static void handle_keypress(int c)
663 if (!key_mapped(c)) {
664 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
665 struct termios tc, save;
668 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
673 tc.c_lflag &= ~(ICANON | ECHO);
676 tcsetattr(0, TCSANOW, &tc);
678 poll(&stdin_poll, 1, -1);
681 tcsetattr(0, TCSAFLUSH, &save);
688 prompt_integer(&delay_secs, "Enter display delay");
691 prompt_integer(&print_entries, "Enter display entries (lines)");
694 if (nr_counters > 1) {
697 fprintf(stderr, "\nAvailable events:");
698 for (i = 0; i < nr_counters; i++)
699 fprintf(stderr, "\n\t%d %s", i, event_name(i));
701 prompt_integer(&sym_counter, "Enter details event counter");
703 if (sym_counter >= nr_counters) {
704 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
708 } else sym_counter = 0;
711 prompt_integer(&count_filter, "Enter display event count filter");
714 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
718 printf("exiting.\n");
721 prompt_symbol(&sym_filter_entry, "Enter details symbol");
724 if (!sym_filter_entry)
727 struct sym_entry *syme = sym_filter_entry;
729 pthread_mutex_lock(&syme->source_lock);
730 sym_filter_entry = NULL;
731 __zero_source_counters(syme);
732 pthread_mutex_unlock(&syme->source_lock);
736 display_weighted = ~display_weighted;
746 static void *display_thread(void *arg __used)
748 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
749 struct termios tc, save;
754 tc.c_lflag &= ~(ICANON | ECHO);
759 delay_msecs = delay_secs * 1000;
760 tcsetattr(0, TCSANOW, &tc);
766 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
769 tcsetattr(0, TCSAFLUSH, &save);
777 /* Tag samples to be skipped. */
778 static const char *skip_symbols[] = {
784 "mwait_idle_with_hints",
785 "ppc64_runlatch_off",
786 "pseries_dedicated_idle_sleep",
790 static int symbol_filter(struct dso *self, struct symbol *sym)
792 struct sym_entry *syme;
793 const char *name = sym->name;
797 * ppc64 uses function descriptors and appends a '.' to the
798 * start of every instruction address. Remove it.
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"))
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;
817 for (i = 0; skip_symbols[i]; i++) {
818 if (!strcmp(skip_symbols[i], name)) {
827 static int parse_symbols(void)
829 struct rb_node *node;
831 int use_modules = vmlinux_name ? 1 : 0;
833 kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
834 if (kernel_dso == NULL)
837 if (dso__load_kernel(kernel_dso, vmlinux_name, symbol_filter, verbose, use_modules) <= 0)
840 node = rb_first(&kernel_dso->syms);
841 sym = rb_entry(node, struct symbol, rb_node);
844 node = rb_last(&kernel_dso->syms);
845 sym = rb_entry(node, struct symbol, rb_node);
849 dso__fprintf(kernel_dso, stderr);
854 dso__delete(kernel_dso);
860 * Binary search in the histogram table and record the hit:
862 static void record_ip(u64 ip, int counter)
864 struct symbol *sym = dso__find_symbol(kernel_dso, ip);
867 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
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);
883 static void process_event(u64 ip, int counter, int user)
892 record_ip(ip, counter);
902 static unsigned int mmap_read_head(struct mmap_data *md)
904 struct perf_counter_mmap_page *pc = md->base;
907 head = pc->data_head;
913 struct timeval last_read, this_read;
915 static void mmap_read_counter(struct mmap_data *md)
917 unsigned int head = mmap_read_head(md);
918 unsigned int old = md->prev;
919 unsigned char *data = md->base + page_size;
922 gettimeofday(&this_read, NULL);
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.
928 * If we somehow ended up ahead of the head, we got messed up.
930 * In either case, truncate and restart at head.
933 if (diff > md->mask / 2 || diff < 0) {
937 timersub(&this_read, &last_read, &iv);
938 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
940 fprintf(stderr, "WARNING: failed to keep up with mmap data."
941 " Last read %lu msecs ago.\n", msecs);
944 * head points to a known good entry, start there.
949 last_read = this_read;
951 for (; old != head;) {
952 event_t *event = (event_t *)&data[old & md->mask];
956 size_t size = event->header.size;
959 * Event straddles the mmap boundary -- header should always
960 * be inside due to u64 alignment of output.
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;
968 cpy = min(md->mask + 1 - (offset & md->mask), len);
969 memcpy(dst, &data[offset & md->mask], cpy);
980 if (event->header.type == PERF_EVENT_SAMPLE) {
982 (event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK) == PERF_EVENT_MISC_USER;
983 process_event(event->ip.ip, md->counter, user);
990 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
991 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
993 static void mmap_read(void)
997 for (i = 0; i < nr_cpus; i++) {
998 for (counter = 0; counter < nr_counters; counter++)
999 mmap_read_counter(&mmap_array[i][counter]);
1006 static void start_counter(int i, int counter)
1008 struct perf_counter_attr *attr;
1012 if (target_pid == -1 && profile_cpu == -1)
1015 attr = attrs + counter;
1017 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1019 attr->inherit = (cpu < 0) && inherit;
1022 fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
1024 if (fd[i][counter] < 0) {
1028 die("No permission - are you root?\n");
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:
1034 if (attr->type == PERF_TYPE_HARDWARE
1035 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1038 warning(" ... trying to fall back to cpu-clock-ticks\n");
1040 attr->type = PERF_TYPE_SOFTWARE;
1041 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1045 error("perfcounter syscall returned with %d (%s)\n",
1046 fd[i][counter], strerror(err));
1047 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
1050 assert(fd[i][counter] >= 0);
1051 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1054 * First counter acts as the group leader:
1056 if (group && group_fd == -1)
1057 group_fd = fd[i][counter];
1059 event_array[nr_poll].fd = fd[i][counter];
1060 event_array[nr_poll].events = POLLIN;
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));
1072 static int __cmd_top(void)
1078 for (i = 0; i < nr_cpus; i++) {
1080 for (counter = 0; counter < nr_counters; counter++)
1081 start_counter(i, counter);
1084 /* Wait for a minimal set of events before starting the snapshot */
1085 poll(event_array, nr_poll, 100);
1089 if (pthread_create(&thread, NULL, display_thread, NULL)) {
1090 printf("Could not create display thread.\n");
1094 if (realtime_prio) {
1095 struct sched_param param;
1097 param.sched_priority = realtime_prio;
1098 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
1099 printf("Could not set realtime priority.\n");
1109 if (hits == samples)
1110 ret = poll(event_array, nr_poll, 100);
1116 static const char * const top_usage[] = {
1117 "perf top [<options>]",
1121 static const struct option options[] = {
1122 OPT_CALLBACK('e', "event", NULL, "event",
1123 "event selector. use 'perf list' to list available 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)"),
1161 int cmd_top(int argc, const char **argv, const char *prefix __used)
1167 page_size = sysconf(_SC_PAGE_SIZE);
1169 argc = parse_options(argc, argv, options, top_usage, 0);
1171 usage_with_options(top_usage, options);
1174 default_interval = freq;
1178 /* CPU and PID are mutually exclusive */
1179 if (target_pid != -1 && profile_cpu != -1) {
1180 printf("WARNING: PID switch overriding CPU\n");
1192 parse_source(sym_filter_entry);
1195 * Fill in the ones not specifically initialized via -c:
1197 for (counter = 0; counter < nr_counters; counter++) {
1198 if (attrs[counter].sample_period)
1201 attrs[counter].sample_period = default_interval;
1204 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1205 assert(nr_cpus <= MAX_NR_CPUS);
1206 assert(nr_cpus >= 0);
1208 if (target_pid != -1 || profile_cpu != -1)