xref: /openbmc/linux/tools/perf/builtin-top.c (revision 82003e04)
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  *		 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
9  *
10  * Improvements and fixes by:
11  *
12  *   Arjan van de Ven <arjan@linux.intel.com>
13  *   Yanmin Zhang <yanmin.zhang@intel.com>
14  *   Wu Fengguang <fengguang.wu@intel.com>
15  *   Mike Galbraith <efault@gmx.de>
16  *   Paul Mackerras <paulus@samba.org>
17  *
18  * Released under the GPL v2. (and only v2, not any later version)
19  */
20 #include "builtin.h"
21 
22 #include "perf.h"
23 
24 #include "util/annotate.h"
25 #include "util/config.h"
26 #include "util/color.h"
27 #include "util/drv_configs.h"
28 #include "util/evlist.h"
29 #include "util/evsel.h"
30 #include "util/machine.h"
31 #include "util/session.h"
32 #include "util/symbol.h"
33 #include "util/thread.h"
34 #include "util/thread_map.h"
35 #include "util/top.h"
36 #include "util/util.h"
37 #include <linux/rbtree.h>
38 #include <subcmd/parse-options.h>
39 #include "util/parse-events.h"
40 #include "util/cpumap.h"
41 #include "util/xyarray.h"
42 #include "util/sort.h"
43 #include "util/intlist.h"
44 #include "util/parse-branch-options.h"
45 #include "arch/common.h"
46 
47 #include "util/debug.h"
48 
49 #include <assert.h>
50 #include <elf.h>
51 #include <fcntl.h>
52 
53 #include <stdio.h>
54 #include <termios.h>
55 #include <unistd.h>
56 #include <inttypes.h>
57 
58 #include <errno.h>
59 #include <time.h>
60 #include <sched.h>
61 
62 #include <sys/syscall.h>
63 #include <sys/ioctl.h>
64 #include <poll.h>
65 #include <sys/prctl.h>
66 #include <sys/wait.h>
67 #include <sys/uio.h>
68 #include <sys/utsname.h>
69 #include <sys/mman.h>
70 
71 #include <linux/stringify.h>
72 #include <linux/time64.h>
73 #include <linux/types.h>
74 
75 static volatile int done;
76 
77 #define HEADER_LINE_NR  5
78 
79 static void perf_top__update_print_entries(struct perf_top *top)
80 {
81 	top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
82 }
83 
84 static void perf_top__sig_winch(int sig __maybe_unused,
85 				siginfo_t *info __maybe_unused, void *arg)
86 {
87 	struct perf_top *top = arg;
88 
89 	get_term_dimensions(&top->winsize);
90 	perf_top__update_print_entries(top);
91 }
92 
93 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
94 {
95 	struct symbol *sym;
96 	struct annotation *notes;
97 	struct map *map;
98 	int err = -1;
99 
100 	if (!he || !he->ms.sym)
101 		return -1;
102 
103 	sym = he->ms.sym;
104 	map = he->ms.map;
105 
106 	/*
107 	 * We can't annotate with just /proc/kallsyms
108 	 */
109 	if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
110 	    !dso__is_kcore(map->dso)) {
111 		pr_err("Can't annotate %s: No vmlinux file was found in the "
112 		       "path\n", sym->name);
113 		sleep(1);
114 		return -1;
115 	}
116 
117 	notes = symbol__annotation(sym);
118 	if (notes->src != NULL) {
119 		pthread_mutex_lock(&notes->lock);
120 		goto out_assign;
121 	}
122 
123 	pthread_mutex_lock(&notes->lock);
124 
125 	if (symbol__alloc_hist(sym) < 0) {
126 		pthread_mutex_unlock(&notes->lock);
127 		pr_err("Not enough memory for annotating '%s' symbol!\n",
128 		       sym->name);
129 		sleep(1);
130 		return err;
131 	}
132 
133 	err = symbol__disassemble(sym, map, 0);
134 	if (err == 0) {
135 out_assign:
136 		top->sym_filter_entry = he;
137 	} else {
138 		char msg[BUFSIZ];
139 		symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
140 		pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
141 	}
142 
143 	pthread_mutex_unlock(&notes->lock);
144 	return err;
145 }
146 
147 static void __zero_source_counters(struct hist_entry *he)
148 {
149 	struct symbol *sym = he->ms.sym;
150 	symbol__annotate_zero_histograms(sym);
151 }
152 
153 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
154 {
155 	struct utsname uts;
156 	int err = uname(&uts);
157 
158 	ui__warning("Out of bounds address found:\n\n"
159 		    "Addr:   %" PRIx64 "\n"
160 		    "DSO:    %s %c\n"
161 		    "Map:    %" PRIx64 "-%" PRIx64 "\n"
162 		    "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
163 		    "Arch:   %s\n"
164 		    "Kernel: %s\n"
165 		    "Tools:  %s\n\n"
166 		    "Not all samples will be on the annotation output.\n\n"
167 		    "Please report to linux-kernel@vger.kernel.org\n",
168 		    ip, map->dso->long_name, dso__symtab_origin(map->dso),
169 		    map->start, map->end, sym->start, sym->end,
170 		    sym->binding == STB_GLOBAL ? 'g' :
171 		    sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
172 		    err ? "[unknown]" : uts.machine,
173 		    err ? "[unknown]" : uts.release, perf_version_string);
174 	if (use_browser <= 0)
175 		sleep(5);
176 
177 	map->erange_warned = true;
178 }
179 
180 static void perf_top__record_precise_ip(struct perf_top *top,
181 					struct hist_entry *he,
182 					int counter, u64 ip)
183 {
184 	struct annotation *notes;
185 	struct symbol *sym = he->ms.sym;
186 	int err = 0;
187 
188 	if (sym == NULL || (use_browser == 0 &&
189 			    (top->sym_filter_entry == NULL ||
190 			     top->sym_filter_entry->ms.sym != sym)))
191 		return;
192 
193 	notes = symbol__annotation(sym);
194 
195 	if (pthread_mutex_trylock(&notes->lock))
196 		return;
197 
198 	err = hist_entry__inc_addr_samples(he, counter, ip);
199 
200 	pthread_mutex_unlock(&notes->lock);
201 
202 	if (unlikely(err)) {
203 		/*
204 		 * This function is now called with he->hists->lock held.
205 		 * Release it before going to sleep.
206 		 */
207 		pthread_mutex_unlock(&he->hists->lock);
208 
209 		if (err == -ERANGE && !he->ms.map->erange_warned)
210 			ui__warn_map_erange(he->ms.map, sym, ip);
211 		else if (err == -ENOMEM) {
212 			pr_err("Not enough memory for annotating '%s' symbol!\n",
213 			       sym->name);
214 			sleep(1);
215 		}
216 
217 		pthread_mutex_lock(&he->hists->lock);
218 	}
219 }
220 
221 static void perf_top__show_details(struct perf_top *top)
222 {
223 	struct hist_entry *he = top->sym_filter_entry;
224 	struct annotation *notes;
225 	struct symbol *symbol;
226 	int more;
227 
228 	if (!he)
229 		return;
230 
231 	symbol = he->ms.sym;
232 	notes = symbol__annotation(symbol);
233 
234 	pthread_mutex_lock(&notes->lock);
235 
236 	if (notes->src == NULL)
237 		goto out_unlock;
238 
239 	printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
240 	printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
241 
242 	more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
243 				       0, top->sym_pcnt_filter, top->print_entries, 4);
244 
245 	if (top->evlist->enabled) {
246 		if (top->zero)
247 			symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
248 		else
249 			symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
250 	}
251 	if (more != 0)
252 		printf("%d lines not displayed, maybe increase display entries [e]\n", more);
253 out_unlock:
254 	pthread_mutex_unlock(&notes->lock);
255 }
256 
257 static void perf_top__print_sym_table(struct perf_top *top)
258 {
259 	char bf[160];
260 	int printed = 0;
261 	const int win_width = top->winsize.ws_col - 1;
262 	struct perf_evsel *evsel = top->sym_evsel;
263 	struct hists *hists = evsel__hists(evsel);
264 
265 	puts(CONSOLE_CLEAR);
266 
267 	perf_top__header_snprintf(top, bf, sizeof(bf));
268 	printf("%s\n", bf);
269 
270 	perf_top__reset_sample_counters(top);
271 
272 	printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
273 
274 	if (hists->stats.nr_lost_warned !=
275 	    hists->stats.nr_events[PERF_RECORD_LOST]) {
276 		hists->stats.nr_lost_warned =
277 			      hists->stats.nr_events[PERF_RECORD_LOST];
278 		color_fprintf(stdout, PERF_COLOR_RED,
279 			      "WARNING: LOST %d chunks, Check IO/CPU overload",
280 			      hists->stats.nr_lost_warned);
281 		++printed;
282 	}
283 
284 	if (top->sym_filter_entry) {
285 		perf_top__show_details(top);
286 		return;
287 	}
288 
289 	if (top->evlist->enabled) {
290 		if (top->zero) {
291 			hists__delete_entries(hists);
292 		} else {
293 			hists__decay_entries(hists, top->hide_user_symbols,
294 					     top->hide_kernel_symbols);
295 		}
296 	}
297 
298 	hists__collapse_resort(hists, NULL);
299 	perf_evsel__output_resort(evsel, NULL);
300 
301 	hists__output_recalc_col_len(hists, top->print_entries - printed);
302 	putchar('\n');
303 	hists__fprintf(hists, false, top->print_entries - printed, win_width,
304 		       top->min_percent, stdout, symbol_conf.use_callchain);
305 }
306 
307 static void prompt_integer(int *target, const char *msg)
308 {
309 	char *buf = malloc(0), *p;
310 	size_t dummy = 0;
311 	int tmp;
312 
313 	fprintf(stdout, "\n%s: ", msg);
314 	if (getline(&buf, &dummy, stdin) < 0)
315 		return;
316 
317 	p = strchr(buf, '\n');
318 	if (p)
319 		*p = 0;
320 
321 	p = buf;
322 	while(*p) {
323 		if (!isdigit(*p))
324 			goto out_free;
325 		p++;
326 	}
327 	tmp = strtoul(buf, NULL, 10);
328 	*target = tmp;
329 out_free:
330 	free(buf);
331 }
332 
333 static void prompt_percent(int *target, const char *msg)
334 {
335 	int tmp = 0;
336 
337 	prompt_integer(&tmp, msg);
338 	if (tmp >= 0 && tmp <= 100)
339 		*target = tmp;
340 }
341 
342 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
343 {
344 	char *buf = malloc(0), *p;
345 	struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
346 	struct hists *hists = evsel__hists(top->sym_evsel);
347 	struct rb_node *next;
348 	size_t dummy = 0;
349 
350 	/* zero counters of active symbol */
351 	if (syme) {
352 		__zero_source_counters(syme);
353 		top->sym_filter_entry = NULL;
354 	}
355 
356 	fprintf(stdout, "\n%s: ", msg);
357 	if (getline(&buf, &dummy, stdin) < 0)
358 		goto out_free;
359 
360 	p = strchr(buf, '\n');
361 	if (p)
362 		*p = 0;
363 
364 	next = rb_first(&hists->entries);
365 	while (next) {
366 		n = rb_entry(next, struct hist_entry, rb_node);
367 		if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
368 			found = n;
369 			break;
370 		}
371 		next = rb_next(&n->rb_node);
372 	}
373 
374 	if (!found) {
375 		fprintf(stderr, "Sorry, %s is not active.\n", buf);
376 		sleep(1);
377 	} else
378 		perf_top__parse_source(top, found);
379 
380 out_free:
381 	free(buf);
382 }
383 
384 static void perf_top__print_mapped_keys(struct perf_top *top)
385 {
386 	char *name = NULL;
387 
388 	if (top->sym_filter_entry) {
389 		struct symbol *sym = top->sym_filter_entry->ms.sym;
390 		name = sym->name;
391 	}
392 
393 	fprintf(stdout, "\nMapped keys:\n");
394 	fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
395 	fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
396 
397 	if (top->evlist->nr_entries > 1)
398 		fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
399 
400 	fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
401 
402 	fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
403 	fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
404 	fprintf(stdout, "\t[S]     stop annotation.\n");
405 
406 	fprintf(stdout,
407 		"\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
408 		top->hide_kernel_symbols ? "yes" : "no");
409 	fprintf(stdout,
410 		"\t[U]     hide user symbols.               \t(%s)\n",
411 		top->hide_user_symbols ? "yes" : "no");
412 	fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
413 	fprintf(stdout, "\t[qQ]    quit.\n");
414 }
415 
416 static int perf_top__key_mapped(struct perf_top *top, int c)
417 {
418 	switch (c) {
419 		case 'd':
420 		case 'e':
421 		case 'f':
422 		case 'z':
423 		case 'q':
424 		case 'Q':
425 		case 'K':
426 		case 'U':
427 		case 'F':
428 		case 's':
429 		case 'S':
430 			return 1;
431 		case 'E':
432 			return top->evlist->nr_entries > 1 ? 1 : 0;
433 		default:
434 			break;
435 	}
436 
437 	return 0;
438 }
439 
440 static bool perf_top__handle_keypress(struct perf_top *top, int c)
441 {
442 	bool ret = true;
443 
444 	if (!perf_top__key_mapped(top, c)) {
445 		struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
446 		struct termios save;
447 
448 		perf_top__print_mapped_keys(top);
449 		fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
450 		fflush(stdout);
451 
452 		set_term_quiet_input(&save);
453 
454 		poll(&stdin_poll, 1, -1);
455 		c = getc(stdin);
456 
457 		tcsetattr(0, TCSAFLUSH, &save);
458 		if (!perf_top__key_mapped(top, c))
459 			return ret;
460 	}
461 
462 	switch (c) {
463 		case 'd':
464 			prompt_integer(&top->delay_secs, "Enter display delay");
465 			if (top->delay_secs < 1)
466 				top->delay_secs = 1;
467 			break;
468 		case 'e':
469 			prompt_integer(&top->print_entries, "Enter display entries (lines)");
470 			if (top->print_entries == 0) {
471 				struct sigaction act = {
472 					.sa_sigaction = perf_top__sig_winch,
473 					.sa_flags     = SA_SIGINFO,
474 				};
475 				perf_top__sig_winch(SIGWINCH, NULL, top);
476 				sigaction(SIGWINCH, &act, NULL);
477 			} else {
478 				signal(SIGWINCH, SIG_DFL);
479 			}
480 			break;
481 		case 'E':
482 			if (top->evlist->nr_entries > 1) {
483 				/* Select 0 as the default event: */
484 				int counter = 0;
485 
486 				fprintf(stderr, "\nAvailable events:");
487 
488 				evlist__for_each_entry(top->evlist, top->sym_evsel)
489 					fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
490 
491 				prompt_integer(&counter, "Enter details event counter");
492 
493 				if (counter >= top->evlist->nr_entries) {
494 					top->sym_evsel = perf_evlist__first(top->evlist);
495 					fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
496 					sleep(1);
497 					break;
498 				}
499 				evlist__for_each_entry(top->evlist, top->sym_evsel)
500 					if (top->sym_evsel->idx == counter)
501 						break;
502 			} else
503 				top->sym_evsel = perf_evlist__first(top->evlist);
504 			break;
505 		case 'f':
506 			prompt_integer(&top->count_filter, "Enter display event count filter");
507 			break;
508 		case 'F':
509 			prompt_percent(&top->sym_pcnt_filter,
510 				       "Enter details display event filter (percent)");
511 			break;
512 		case 'K':
513 			top->hide_kernel_symbols = !top->hide_kernel_symbols;
514 			break;
515 		case 'q':
516 		case 'Q':
517 			printf("exiting.\n");
518 			if (top->dump_symtab)
519 				perf_session__fprintf_dsos(top->session, stderr);
520 			ret = false;
521 			break;
522 		case 's':
523 			perf_top__prompt_symbol(top, "Enter details symbol");
524 			break;
525 		case 'S':
526 			if (!top->sym_filter_entry)
527 				break;
528 			else {
529 				struct hist_entry *syme = top->sym_filter_entry;
530 
531 				top->sym_filter_entry = NULL;
532 				__zero_source_counters(syme);
533 			}
534 			break;
535 		case 'U':
536 			top->hide_user_symbols = !top->hide_user_symbols;
537 			break;
538 		case 'z':
539 			top->zero = !top->zero;
540 			break;
541 		default:
542 			break;
543 	}
544 
545 	return ret;
546 }
547 
548 static void perf_top__sort_new_samples(void *arg)
549 {
550 	struct perf_top *t = arg;
551 	struct perf_evsel *evsel = t->sym_evsel;
552 	struct hists *hists;
553 
554 	perf_top__reset_sample_counters(t);
555 
556 	if (t->evlist->selected != NULL)
557 		t->sym_evsel = t->evlist->selected;
558 
559 	hists = evsel__hists(evsel);
560 
561 	if (t->evlist->enabled) {
562 		if (t->zero) {
563 			hists__delete_entries(hists);
564 		} else {
565 			hists__decay_entries(hists, t->hide_user_symbols,
566 					     t->hide_kernel_symbols);
567 		}
568 	}
569 
570 	hists__collapse_resort(hists, NULL);
571 	perf_evsel__output_resort(evsel, NULL);
572 }
573 
574 static void *display_thread_tui(void *arg)
575 {
576 	struct perf_evsel *pos;
577 	struct perf_top *top = arg;
578 	const char *help = "For a higher level overview, try: perf top --sort comm,dso";
579 	struct hist_browser_timer hbt = {
580 		.timer		= perf_top__sort_new_samples,
581 		.arg		= top,
582 		.refresh	= top->delay_secs,
583 	};
584 
585 	perf_top__sort_new_samples(top);
586 
587 	/*
588 	 * Initialize the uid_filter_str, in the future the TUI will allow
589 	 * Zooming in/out UIDs. For now juse use whatever the user passed
590 	 * via --uid.
591 	 */
592 	evlist__for_each_entry(top->evlist, pos) {
593 		struct hists *hists = evsel__hists(pos);
594 		hists->uid_filter_str = top->record_opts.target.uid_str;
595 	}
596 
597 	perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
598 				      top->min_percent,
599 				      &top->session->header.env);
600 
601 	done = 1;
602 	return NULL;
603 }
604 
605 static void display_sig(int sig __maybe_unused)
606 {
607 	done = 1;
608 }
609 
610 static void display_setup_sig(void)
611 {
612 	signal(SIGSEGV, sighandler_dump_stack);
613 	signal(SIGFPE, sighandler_dump_stack);
614 	signal(SIGINT,  display_sig);
615 	signal(SIGQUIT, display_sig);
616 	signal(SIGTERM, display_sig);
617 }
618 
619 static void *display_thread(void *arg)
620 {
621 	struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
622 	struct termios save;
623 	struct perf_top *top = arg;
624 	int delay_msecs, c;
625 
626 	display_setup_sig();
627 	pthread__unblock_sigwinch();
628 repeat:
629 	delay_msecs = top->delay_secs * MSEC_PER_SEC;
630 	set_term_quiet_input(&save);
631 	/* trash return*/
632 	getc(stdin);
633 
634 	while (!done) {
635 		perf_top__print_sym_table(top);
636 		/*
637 		 * Either timeout expired or we got an EINTR due to SIGWINCH,
638 		 * refresh screen in both cases.
639 		 */
640 		switch (poll(&stdin_poll, 1, delay_msecs)) {
641 		case 0:
642 			continue;
643 		case -1:
644 			if (errno == EINTR)
645 				continue;
646 			/* Fall trhu */
647 		default:
648 			c = getc(stdin);
649 			tcsetattr(0, TCSAFLUSH, &save);
650 
651 			if (perf_top__handle_keypress(top, c))
652 				goto repeat;
653 			done = 1;
654 		}
655 	}
656 
657 	tcsetattr(0, TCSAFLUSH, &save);
658 	return NULL;
659 }
660 
661 static int hist_iter__top_callback(struct hist_entry_iter *iter,
662 				   struct addr_location *al, bool single,
663 				   void *arg)
664 {
665 	struct perf_top *top = arg;
666 	struct hist_entry *he = iter->he;
667 	struct perf_evsel *evsel = iter->evsel;
668 
669 	if (perf_hpp_list.sym && single)
670 		perf_top__record_precise_ip(top, he, evsel->idx, al->addr);
671 
672 	hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
673 		     !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
674 	return 0;
675 }
676 
677 static void perf_event__process_sample(struct perf_tool *tool,
678 				       const union perf_event *event,
679 				       struct perf_evsel *evsel,
680 				       struct perf_sample *sample,
681 				       struct machine *machine)
682 {
683 	struct perf_top *top = container_of(tool, struct perf_top, tool);
684 	struct addr_location al;
685 	int err;
686 
687 	if (!machine && perf_guest) {
688 		static struct intlist *seen;
689 
690 		if (!seen)
691 			seen = intlist__new(NULL);
692 
693 		if (!intlist__has_entry(seen, sample->pid)) {
694 			pr_err("Can't find guest [%d]'s kernel information\n",
695 				sample->pid);
696 			intlist__add(seen, sample->pid);
697 		}
698 		return;
699 	}
700 
701 	if (!machine) {
702 		pr_err("%u unprocessable samples recorded.\r",
703 		       top->session->evlist->stats.nr_unprocessable_samples++);
704 		return;
705 	}
706 
707 	if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
708 		top->exact_samples++;
709 
710 	if (machine__resolve(machine, &al, sample) < 0)
711 		return;
712 
713 	if (!machine->kptr_restrict_warned &&
714 	    symbol_conf.kptr_restrict &&
715 	    al.cpumode == PERF_RECORD_MISC_KERNEL) {
716 		ui__warning(
717 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
718 "Check /proc/sys/kernel/kptr_restrict.\n\n"
719 "Kernel%s samples will not be resolved.\n",
720 			  al.map && !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
721 			  " modules" : "");
722 		if (use_browser <= 0)
723 			sleep(5);
724 		machine->kptr_restrict_warned = true;
725 	}
726 
727 	if (al.sym == NULL) {
728 		const char *msg = "Kernel samples will not be resolved.\n";
729 		/*
730 		 * As we do lazy loading of symtabs we only will know if the
731 		 * specified vmlinux file is invalid when we actually have a
732 		 * hit in kernel space and then try to load it. So if we get
733 		 * here and there are _no_ symbols in the DSO backing the
734 		 * kernel map, bail out.
735 		 *
736 		 * We may never get here, for instance, if we use -K/
737 		 * --hide-kernel-symbols, even if the user specifies an
738 		 * invalid --vmlinux ;-)
739 		 */
740 		if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
741 		    al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
742 		    RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
743 			if (symbol_conf.vmlinux_name) {
744 				char serr[256];
745 				dso__strerror_load(al.map->dso, serr, sizeof(serr));
746 				ui__warning("The %s file can't be used: %s\n%s",
747 					    symbol_conf.vmlinux_name, serr, msg);
748 			} else {
749 				ui__warning("A vmlinux file was not found.\n%s",
750 					    msg);
751 			}
752 
753 			if (use_browser <= 0)
754 				sleep(5);
755 			top->vmlinux_warned = true;
756 		}
757 	}
758 
759 	if (al.sym == NULL || !al.sym->idle) {
760 		struct hists *hists = evsel__hists(evsel);
761 		struct hist_entry_iter iter = {
762 			.evsel		= evsel,
763 			.sample 	= sample,
764 			.add_entry_cb 	= hist_iter__top_callback,
765 		};
766 
767 		if (symbol_conf.cumulate_callchain)
768 			iter.ops = &hist_iter_cumulative;
769 		else
770 			iter.ops = &hist_iter_normal;
771 
772 		pthread_mutex_lock(&hists->lock);
773 
774 		err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
775 		if (err < 0)
776 			pr_err("Problem incrementing symbol period, skipping event\n");
777 
778 		pthread_mutex_unlock(&hists->lock);
779 	}
780 
781 	addr_location__put(&al);
782 }
783 
784 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
785 {
786 	struct perf_sample sample;
787 	struct perf_evsel *evsel;
788 	struct perf_session *session = top->session;
789 	union perf_event *event;
790 	struct machine *machine;
791 	int ret;
792 
793 	while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
794 		ret = perf_evlist__parse_sample(top->evlist, event, &sample);
795 		if (ret) {
796 			pr_err("Can't parse sample, err = %d\n", ret);
797 			goto next_event;
798 		}
799 
800 		evsel = perf_evlist__id2evsel(session->evlist, sample.id);
801 		assert(evsel != NULL);
802 
803 		if (event->header.type == PERF_RECORD_SAMPLE)
804 			++top->samples;
805 
806 		switch (sample.cpumode) {
807 		case PERF_RECORD_MISC_USER:
808 			++top->us_samples;
809 			if (top->hide_user_symbols)
810 				goto next_event;
811 			machine = &session->machines.host;
812 			break;
813 		case PERF_RECORD_MISC_KERNEL:
814 			++top->kernel_samples;
815 			if (top->hide_kernel_symbols)
816 				goto next_event;
817 			machine = &session->machines.host;
818 			break;
819 		case PERF_RECORD_MISC_GUEST_KERNEL:
820 			++top->guest_kernel_samples;
821 			machine = perf_session__find_machine(session,
822 							     sample.pid);
823 			break;
824 		case PERF_RECORD_MISC_GUEST_USER:
825 			++top->guest_us_samples;
826 			/*
827 			 * TODO: we don't process guest user from host side
828 			 * except simple counting.
829 			 */
830 			goto next_event;
831 		default:
832 			if (event->header.type == PERF_RECORD_SAMPLE)
833 				goto next_event;
834 			machine = &session->machines.host;
835 			break;
836 		}
837 
838 
839 		if (event->header.type == PERF_RECORD_SAMPLE) {
840 			perf_event__process_sample(&top->tool, event, evsel,
841 						   &sample, machine);
842 		} else if (event->header.type < PERF_RECORD_MAX) {
843 			hists__inc_nr_events(evsel__hists(evsel), event->header.type);
844 			machine__process_event(machine, event, &sample);
845 		} else
846 			++session->evlist->stats.nr_unknown_events;
847 next_event:
848 		perf_evlist__mmap_consume(top->evlist, idx);
849 	}
850 }
851 
852 static void perf_top__mmap_read(struct perf_top *top)
853 {
854 	int i;
855 
856 	for (i = 0; i < top->evlist->nr_mmaps; i++)
857 		perf_top__mmap_read_idx(top, i);
858 }
859 
860 static int perf_top__start_counters(struct perf_top *top)
861 {
862 	char msg[512];
863 	struct perf_evsel *counter;
864 	struct perf_evlist *evlist = top->evlist;
865 	struct record_opts *opts = &top->record_opts;
866 
867 	perf_evlist__config(evlist, opts, &callchain_param);
868 
869 	evlist__for_each_entry(evlist, counter) {
870 try_again:
871 		if (perf_evsel__open(counter, top->evlist->cpus,
872 				     top->evlist->threads) < 0) {
873 			if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
874 				if (verbose)
875 					ui__warning("%s\n", msg);
876 				goto try_again;
877 			}
878 
879 			perf_evsel__open_strerror(counter, &opts->target,
880 						  errno, msg, sizeof(msg));
881 			ui__error("%s\n", msg);
882 			goto out_err;
883 		}
884 	}
885 
886 	if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
887 		ui__error("Failed to mmap with %d (%s)\n",
888 			    errno, str_error_r(errno, msg, sizeof(msg)));
889 		goto out_err;
890 	}
891 
892 	return 0;
893 
894 out_err:
895 	return -1;
896 }
897 
898 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
899 {
900 	if (!perf_hpp_list.sym) {
901 		if (callchain->enabled) {
902 			ui__error("Selected -g but \"sym\" not present in --sort/-s.");
903 			return -EINVAL;
904 		}
905 	} else if (callchain->mode != CHAIN_NONE) {
906 		if (callchain_register_param(callchain) < 0) {
907 			ui__error("Can't register callchain params.\n");
908 			return -EINVAL;
909 		}
910 	}
911 
912 	return 0;
913 }
914 
915 static int __cmd_top(struct perf_top *top)
916 {
917 	char msg[512];
918 	struct perf_evsel *pos;
919 	struct perf_evsel_config_term *err_term;
920 	struct perf_evlist *evlist = top->evlist;
921 	struct record_opts *opts = &top->record_opts;
922 	pthread_t thread;
923 	int ret;
924 
925 	top->session = perf_session__new(NULL, false, NULL);
926 	if (top->session == NULL)
927 		return -1;
928 
929 	if (!objdump_path) {
930 		ret = perf_env__lookup_objdump(&top->session->header.env);
931 		if (ret)
932 			goto out_delete;
933 	}
934 
935 	ret = callchain_param__setup_sample_type(&callchain_param);
936 	if (ret)
937 		goto out_delete;
938 
939 	if (perf_session__register_idle_thread(top->session) < 0)
940 		goto out_delete;
941 
942 	machine__synthesize_threads(&top->session->machines.host, &opts->target,
943 				    top->evlist->threads, false, opts->proc_map_timeout);
944 
945 	if (perf_hpp_list.socket) {
946 		ret = perf_env__read_cpu_topology_map(&perf_env);
947 		if (ret < 0)
948 			goto out_err_cpu_topo;
949 	}
950 
951 	ret = perf_top__start_counters(top);
952 	if (ret)
953 		goto out_delete;
954 
955 	ret = perf_evlist__apply_drv_configs(evlist, &pos, &err_term);
956 	if (ret) {
957 		error("failed to set config \"%s\" on event %s with %d (%s)\n",
958 			err_term->val.drv_cfg, perf_evsel__name(pos), errno,
959 			str_error_r(errno, msg, sizeof(msg)));
960 		goto out_delete;
961 	}
962 
963 	top->session->evlist = top->evlist;
964 	perf_session__set_id_hdr_size(top->session);
965 
966 	/*
967 	 * When perf is starting the traced process, all the events (apart from
968 	 * group members) have enable_on_exec=1 set, so don't spoil it by
969 	 * prematurely enabling them.
970 	 *
971 	 * XXX 'top' still doesn't start workloads like record, trace, but should,
972 	 * so leave the check here.
973 	 */
974         if (!target__none(&opts->target))
975                 perf_evlist__enable(top->evlist);
976 
977 	/* Wait for a minimal set of events before starting the snapshot */
978 	perf_evlist__poll(top->evlist, 100);
979 
980 	perf_top__mmap_read(top);
981 
982 	ret = -1;
983 	if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
984 							    display_thread), top)) {
985 		ui__error("Could not create display thread.\n");
986 		goto out_delete;
987 	}
988 
989 	if (top->realtime_prio) {
990 		struct sched_param param;
991 
992 		param.sched_priority = top->realtime_prio;
993 		if (sched_setscheduler(0, SCHED_FIFO, &param)) {
994 			ui__error("Could not set realtime priority.\n");
995 			goto out_join;
996 		}
997 	}
998 
999 	while (!done) {
1000 		u64 hits = top->samples;
1001 
1002 		perf_top__mmap_read(top);
1003 
1004 		if (hits == top->samples)
1005 			ret = perf_evlist__poll(top->evlist, 100);
1006 	}
1007 
1008 	ret = 0;
1009 out_join:
1010 	pthread_join(thread, NULL);
1011 out_delete:
1012 	perf_session__delete(top->session);
1013 	top->session = NULL;
1014 
1015 	return ret;
1016 
1017 out_err_cpu_topo: {
1018 	char errbuf[BUFSIZ];
1019 	const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1020 
1021 	ui__error("Could not read the CPU topology map: %s\n", err);
1022 	goto out_delete;
1023 }
1024 }
1025 
1026 static int
1027 callchain_opt(const struct option *opt, const char *arg, int unset)
1028 {
1029 	symbol_conf.use_callchain = true;
1030 	return record_callchain_opt(opt, arg, unset);
1031 }
1032 
1033 static int
1034 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1035 {
1036 	struct callchain_param *callchain = opt->value;
1037 
1038 	callchain->enabled = !unset;
1039 	callchain->record_mode = CALLCHAIN_FP;
1040 
1041 	/*
1042 	 * --no-call-graph
1043 	 */
1044 	if (unset) {
1045 		symbol_conf.use_callchain = false;
1046 		callchain->record_mode = CALLCHAIN_NONE;
1047 		return 0;
1048 	}
1049 
1050 	return parse_callchain_top_opt(arg);
1051 }
1052 
1053 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1054 {
1055 	if (!strcmp(var, "top.call-graph"))
1056 		var = "call-graph.record-mode"; /* fall-through */
1057 	if (!strcmp(var, "top.children")) {
1058 		symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1059 		return 0;
1060 	}
1061 
1062 	return 0;
1063 }
1064 
1065 static int
1066 parse_percent_limit(const struct option *opt, const char *arg,
1067 		    int unset __maybe_unused)
1068 {
1069 	struct perf_top *top = opt->value;
1070 
1071 	top->min_percent = strtof(arg, NULL);
1072 	return 0;
1073 }
1074 
1075 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1076 	"\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1077 
1078 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1079 {
1080 	char errbuf[BUFSIZ];
1081 	struct perf_top top = {
1082 		.count_filter	     = 5,
1083 		.delay_secs	     = 2,
1084 		.record_opts = {
1085 			.mmap_pages	= UINT_MAX,
1086 			.user_freq	= UINT_MAX,
1087 			.user_interval	= ULLONG_MAX,
1088 			.freq		= 4000, /* 4 KHz */
1089 			.target		= {
1090 				.uses_mmap   = true,
1091 			},
1092 			.proc_map_timeout    = 500,
1093 		},
1094 		.max_stack	     = sysctl_perf_event_max_stack,
1095 		.sym_pcnt_filter     = 5,
1096 	};
1097 	struct record_opts *opts = &top.record_opts;
1098 	struct target *target = &opts->target;
1099 	const struct option options[] = {
1100 	OPT_CALLBACK('e', "event", &top.evlist, "event",
1101 		     "event selector. use 'perf list' to list available events",
1102 		     parse_events_option),
1103 	OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1104 	OPT_STRING('p', "pid", &target->pid, "pid",
1105 		    "profile events on existing process id"),
1106 	OPT_STRING('t', "tid", &target->tid, "tid",
1107 		    "profile events on existing thread id"),
1108 	OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1109 			    "system-wide collection from all CPUs"),
1110 	OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1111 		    "list of cpus to monitor"),
1112 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1113 		   "file", "vmlinux pathname"),
1114 	OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1115 		    "don't load vmlinux even if found"),
1116 	OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1117 		    "hide kernel symbols"),
1118 	OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1119 		     "number of mmap data pages",
1120 		     perf_evlist__parse_mmap_pages),
1121 	OPT_INTEGER('r', "realtime", &top.realtime_prio,
1122 		    "collect data with this RT SCHED_FIFO priority"),
1123 	OPT_INTEGER('d', "delay", &top.delay_secs,
1124 		    "number of seconds to delay between refreshes"),
1125 	OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1126 			    "dump the symbol table used for profiling"),
1127 	OPT_INTEGER('f', "count-filter", &top.count_filter,
1128 		    "only display functions with more events than this"),
1129 	OPT_BOOLEAN(0, "group", &opts->group,
1130 			    "put the counters into a counter group"),
1131 	OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1132 		    "child tasks do not inherit counters"),
1133 	OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1134 		    "symbol to annotate"),
1135 	OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1136 	OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1137 	OPT_INTEGER('E', "entries", &top.print_entries,
1138 		    "display this many functions"),
1139 	OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1140 		    "hide user symbols"),
1141 	OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1142 	OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1143 	OPT_INCR('v', "verbose", &verbose,
1144 		    "be more verbose (show counter open errors, etc)"),
1145 	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1146 		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1147 		   " Please refer the man page for the complete list."),
1148 	OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1149 		   "output field(s): overhead, period, sample plus all of sort keys"),
1150 	OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1151 		    "Show a column with the number of samples"),
1152 	OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1153 			   NULL, "enables call-graph recording and display",
1154 			   &callchain_opt),
1155 	OPT_CALLBACK(0, "call-graph", &callchain_param,
1156 		     "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1157 		     top_callchain_help, &parse_callchain_opt),
1158 	OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1159 		    "Accumulate callchains of children and show total overhead as well"),
1160 	OPT_INTEGER(0, "max-stack", &top.max_stack,
1161 		    "Set the maximum stack depth when parsing the callchain. "
1162 		    "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1163 	OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1164 		   "ignore callees of these functions in call graphs",
1165 		   report_parse_ignore_callees_opt),
1166 	OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1167 		    "Show a column with the sum of periods"),
1168 	OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1169 		   "only consider symbols in these dsos"),
1170 	OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1171 		   "only consider symbols in these comms"),
1172 	OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1173 		   "only consider these symbols"),
1174 	OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1175 		    "Interleave source code with assembly code (default)"),
1176 	OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1177 		    "Display raw encoding of assembly instructions (default)"),
1178 	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1179 		    "Enable kernel symbol demangling"),
1180 	OPT_STRING(0, "objdump", &objdump_path, "path",
1181 		    "objdump binary to use for disassembly and annotations"),
1182 	OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1183 		   "Specify disassembler style (e.g. -M intel for intel syntax)"),
1184 	OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1185 	OPT_CALLBACK(0, "percent-limit", &top, "percent",
1186 		     "Don't show entries under that percent", parse_percent_limit),
1187 	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1188 		     "How to display percentage of filtered entries", parse_filter_percentage),
1189 	OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1190 		   "width[,width...]",
1191 		   "don't try to adjust column width, use these fixed values"),
1192 	OPT_UINTEGER(0, "proc-map-timeout", &opts->proc_map_timeout,
1193 			"per thread proc mmap processing timeout in ms"),
1194 	OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1195 		     "branch any", "sample any taken branches",
1196 		     parse_branch_stack),
1197 	OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1198 		     "branch filter mask", "branch stack filter modes",
1199 		     parse_branch_stack),
1200 	OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1201 		    "Show raw trace event output (do not use print fmt or plugins)"),
1202 	OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1203 		    "Show entries in a hierarchy"),
1204 	OPT_END()
1205 	};
1206 	const char * const top_usage[] = {
1207 		"perf top [<options>]",
1208 		NULL
1209 	};
1210 	int status = hists__init();
1211 
1212 	if (status < 0)
1213 		return status;
1214 
1215 	top.evlist = perf_evlist__new();
1216 	if (top.evlist == NULL)
1217 		return -ENOMEM;
1218 
1219 	perf_config(perf_top_config, &top);
1220 
1221 	argc = parse_options(argc, argv, options, top_usage, 0);
1222 	if (argc)
1223 		usage_with_options(top_usage, options);
1224 
1225 	if (!top.evlist->nr_entries &&
1226 	    perf_evlist__add_default(top.evlist) < 0) {
1227 		pr_err("Not enough memory for event selector list\n");
1228 		goto out_delete_evlist;
1229 	}
1230 
1231 	if (symbol_conf.report_hierarchy) {
1232 		/* disable incompatible options */
1233 		symbol_conf.event_group = false;
1234 		symbol_conf.cumulate_callchain = false;
1235 
1236 		if (field_order) {
1237 			pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1238 			parse_options_usage(top_usage, options, "fields", 0);
1239 			parse_options_usage(NULL, options, "hierarchy", 0);
1240 			goto out_delete_evlist;
1241 		}
1242 	}
1243 
1244 	sort__mode = SORT_MODE__TOP;
1245 	/* display thread wants entries to be collapsed in a different tree */
1246 	perf_hpp_list.need_collapse = 1;
1247 
1248 	if (top.use_stdio)
1249 		use_browser = 0;
1250 	else if (top.use_tui)
1251 		use_browser = 1;
1252 
1253 	setup_browser(false);
1254 
1255 	if (setup_sorting(top.evlist) < 0) {
1256 		if (sort_order)
1257 			parse_options_usage(top_usage, options, "s", 1);
1258 		if (field_order)
1259 			parse_options_usage(sort_order ? NULL : top_usage,
1260 					    options, "fields", 0);
1261 		goto out_delete_evlist;
1262 	}
1263 
1264 	status = target__validate(target);
1265 	if (status) {
1266 		target__strerror(target, status, errbuf, BUFSIZ);
1267 		ui__warning("%s\n", errbuf);
1268 	}
1269 
1270 	status = target__parse_uid(target);
1271 	if (status) {
1272 		int saved_errno = errno;
1273 
1274 		target__strerror(target, status, errbuf, BUFSIZ);
1275 		ui__error("%s\n", errbuf);
1276 
1277 		status = -saved_errno;
1278 		goto out_delete_evlist;
1279 	}
1280 
1281 	if (target__none(target))
1282 		target->system_wide = true;
1283 
1284 	if (perf_evlist__create_maps(top.evlist, target) < 0) {
1285 		ui__error("Couldn't create thread/CPU maps: %s\n",
1286 			  errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1287 		goto out_delete_evlist;
1288 	}
1289 
1290 	symbol_conf.nr_events = top.evlist->nr_entries;
1291 
1292 	if (top.delay_secs < 1)
1293 		top.delay_secs = 1;
1294 
1295 	if (record_opts__config(opts)) {
1296 		status = -EINVAL;
1297 		goto out_delete_evlist;
1298 	}
1299 
1300 	top.sym_evsel = perf_evlist__first(top.evlist);
1301 
1302 	if (!callchain_param.enabled) {
1303 		symbol_conf.cumulate_callchain = false;
1304 		perf_hpp__cancel_cumulate();
1305 	}
1306 
1307 	if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1308 		callchain_param.order = ORDER_CALLER;
1309 
1310 	status = symbol__annotation_init();
1311 	if (status < 0)
1312 		goto out_delete_evlist;
1313 
1314 	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1315 	if (symbol__init(NULL) < 0)
1316 		return -1;
1317 
1318 	sort__setup_elide(stdout);
1319 
1320 	get_term_dimensions(&top.winsize);
1321 	if (top.print_entries == 0) {
1322 		struct sigaction act = {
1323 			.sa_sigaction = perf_top__sig_winch,
1324 			.sa_flags     = SA_SIGINFO,
1325 		};
1326 		perf_top__update_print_entries(&top);
1327 		sigaction(SIGWINCH, &act, NULL);
1328 	}
1329 
1330 	status = __cmd_top(&top);
1331 
1332 out_delete_evlist:
1333 	perf_evlist__delete(top.evlist);
1334 
1335 	return status;
1336 }
1337