xref: /openbmc/linux/tools/perf/builtin-top.c (revision 80e06e54)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * builtin-top.c
4  *
5  * Builtin top command: Display a continuously updated profile of
6  * any workload, CPU or specific PID.
7  *
8  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
9  *		 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
10  *
11  * Improvements and fixes by:
12  *
13  *   Arjan van de Ven <arjan@linux.intel.com>
14  *   Yanmin Zhang <yanmin.zhang@intel.com>
15  *   Wu Fengguang <fengguang.wu@intel.com>
16  *   Mike Galbraith <efault@gmx.de>
17  *   Paul Mackerras <paulus@samba.org>
18  */
19 #include "builtin.h"
20 
21 #include "perf.h"
22 
23 #include "util/annotate.h"
24 #include "util/bpf-event.h"
25 #include "util/cgroup.h"
26 #include "util/config.h"
27 #include "util/color.h"
28 #include "util/dso.h"
29 #include "util/evlist.h"
30 #include "util/evsel.h"
31 #include "util/evsel_config.h"
32 #include "util/event.h"
33 #include "util/machine.h"
34 #include "util/map.h"
35 #include "util/mmap.h"
36 #include "util/session.h"
37 #include "util/thread.h"
38 #include "util/symbol.h"
39 #include "util/synthetic-events.h"
40 #include "util/top.h"
41 #include "util/util.h"
42 #include <linux/rbtree.h>
43 #include <subcmd/parse-options.h>
44 #include "util/parse-events.h"
45 #include "util/callchain.h"
46 #include "util/cpumap.h"
47 #include "util/sort.h"
48 #include "util/string2.h"
49 #include "util/term.h"
50 #include "util/intlist.h"
51 #include "util/parse-branch-options.h"
52 #include "arch/common.h"
53 #include "ui/ui.h"
54 
55 #include "util/debug.h"
56 #include "util/ordered-events.h"
57 #include "util/pfm.h"
58 
59 #include <assert.h>
60 #include <elf.h>
61 #include <fcntl.h>
62 
63 #include <stdio.h>
64 #include <termios.h>
65 #include <unistd.h>
66 #include <inttypes.h>
67 
68 #include <errno.h>
69 #include <time.h>
70 #include <sched.h>
71 #include <signal.h>
72 
73 #include <sys/syscall.h>
74 #include <sys/ioctl.h>
75 #include <poll.h>
76 #include <sys/prctl.h>
77 #include <sys/wait.h>
78 #include <sys/uio.h>
79 #include <sys/utsname.h>
80 #include <sys/mman.h>
81 
82 #include <linux/stringify.h>
83 #include <linux/time64.h>
84 #include <linux/types.h>
85 #include <linux/err.h>
86 
87 #include <linux/ctype.h>
88 #include <perf/mmap.h>
89 
90 static volatile sig_atomic_t done;
91 static volatile sig_atomic_t resize;
92 
93 #define HEADER_LINE_NR  5
94 
95 static void perf_top__update_print_entries(struct perf_top *top)
96 {
97 	top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
98 }
99 
100 static void winch_sig(int sig __maybe_unused)
101 {
102 	resize = 1;
103 }
104 
105 static void perf_top__resize(struct perf_top *top)
106 {
107 	get_term_dimensions(&top->winsize);
108 	perf_top__update_print_entries(top);
109 }
110 
111 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
112 {
113 	struct evsel *evsel;
114 	struct symbol *sym;
115 	struct annotation *notes;
116 	struct map *map;
117 	struct dso *dso;
118 	int err = -1;
119 
120 	if (!he || !he->ms.sym)
121 		return -1;
122 
123 	evsel = hists_to_evsel(he->hists);
124 
125 	sym = he->ms.sym;
126 	map = he->ms.map;
127 	dso = map__dso(map);
128 
129 	/*
130 	 * We can't annotate with just /proc/kallsyms
131 	 */
132 	if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS && !dso__is_kcore(dso)) {
133 		pr_err("Can't annotate %s: No vmlinux file was found in the "
134 		       "path\n", sym->name);
135 		sleep(1);
136 		return -1;
137 	}
138 
139 	notes = symbol__annotation(sym);
140 	annotation__lock(notes);
141 
142 	if (!symbol__hists(sym, top->evlist->core.nr_entries)) {
143 		annotation__unlock(notes);
144 		pr_err("Not enough memory for annotating '%s' symbol!\n",
145 		       sym->name);
146 		sleep(1);
147 		return err;
148 	}
149 
150 	err = symbol__annotate(&he->ms, evsel, NULL);
151 	if (err == 0) {
152 		top->sym_filter_entry = he;
153 	} else {
154 		char msg[BUFSIZ];
155 		symbol__strerror_disassemble(&he->ms, err, msg, sizeof(msg));
156 		pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
157 	}
158 
159 	annotation__unlock(notes);
160 	return err;
161 }
162 
163 static void __zero_source_counters(struct hist_entry *he)
164 {
165 	struct symbol *sym = he->ms.sym;
166 	symbol__annotate_zero_histograms(sym);
167 }
168 
169 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
170 {
171 	struct utsname uts;
172 	int err = uname(&uts);
173 	struct dso *dso = map__dso(map);
174 
175 	ui__warning("Out of bounds address found:\n\n"
176 		    "Addr:   %" PRIx64 "\n"
177 		    "DSO:    %s %c\n"
178 		    "Map:    %" PRIx64 "-%" PRIx64 "\n"
179 		    "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
180 		    "Arch:   %s\n"
181 		    "Kernel: %s\n"
182 		    "Tools:  %s\n\n"
183 		    "Not all samples will be on the annotation output.\n\n"
184 		    "Please report to linux-kernel@vger.kernel.org\n",
185 		    ip, dso->long_name, dso__symtab_origin(dso),
186 		    map__start(map), map__end(map), sym->start, sym->end,
187 		    sym->binding == STB_GLOBAL ? 'g' :
188 		    sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
189 		    err ? "[unknown]" : uts.machine,
190 		    err ? "[unknown]" : uts.release, perf_version_string);
191 	if (use_browser <= 0)
192 		sleep(5);
193 
194 	map__set_erange_warned(map, true);
195 }
196 
197 static void perf_top__record_precise_ip(struct perf_top *top,
198 					struct hist_entry *he,
199 					struct perf_sample *sample,
200 					struct evsel *evsel, u64 ip)
201 	EXCLUSIVE_LOCKS_REQUIRED(he->hists->lock)
202 {
203 	struct annotation *notes;
204 	struct symbol *sym = he->ms.sym;
205 	int err = 0;
206 
207 	if (sym == NULL || (use_browser == 0 &&
208 			    (top->sym_filter_entry == NULL ||
209 			     top->sym_filter_entry->ms.sym != sym)))
210 		return;
211 
212 	notes = symbol__annotation(sym);
213 
214 	if (!annotation__trylock(notes))
215 		return;
216 
217 	err = hist_entry__inc_addr_samples(he, sample, evsel, ip);
218 
219 	annotation__unlock(notes);
220 
221 	if (unlikely(err)) {
222 		/*
223 		 * This function is now called with he->hists->lock held.
224 		 * Release it before going to sleep.
225 		 */
226 		mutex_unlock(&he->hists->lock);
227 
228 		if (err == -ERANGE && !map__erange_warned(he->ms.map))
229 			ui__warn_map_erange(he->ms.map, sym, ip);
230 		else if (err == -ENOMEM) {
231 			pr_err("Not enough memory for annotating '%s' symbol!\n",
232 			       sym->name);
233 			sleep(1);
234 		}
235 
236 		mutex_lock(&he->hists->lock);
237 	}
238 }
239 
240 static void perf_top__show_details(struct perf_top *top)
241 {
242 	struct hist_entry *he = top->sym_filter_entry;
243 	struct evsel *evsel;
244 	struct annotation *notes;
245 	struct symbol *symbol;
246 	int more;
247 
248 	if (!he)
249 		return;
250 
251 	evsel = hists_to_evsel(he->hists);
252 
253 	symbol = he->ms.sym;
254 	notes = symbol__annotation(symbol);
255 
256 	annotation__lock(notes);
257 
258 	symbol__calc_percent(symbol, evsel);
259 
260 	if (notes->src == NULL)
261 		goto out_unlock;
262 
263 	printf("Showing %s for %s\n", evsel__name(top->sym_evsel), symbol->name);
264 	printf("  Events  Pcnt (>=%d%%)\n", annotate_opts.min_pcnt);
265 
266 	more = symbol__annotate_printf(&he->ms, top->sym_evsel);
267 
268 	if (top->evlist->enabled) {
269 		if (top->zero)
270 			symbol__annotate_zero_histogram(symbol, top->sym_evsel->core.idx);
271 		else
272 			symbol__annotate_decay_histogram(symbol, top->sym_evsel->core.idx);
273 	}
274 	if (more != 0)
275 		printf("%d lines not displayed, maybe increase display entries [e]\n", more);
276 out_unlock:
277 	annotation__unlock(notes);
278 }
279 
280 static void perf_top__resort_hists(struct perf_top *t)
281 {
282 	struct evlist *evlist = t->evlist;
283 	struct evsel *pos;
284 
285 	evlist__for_each_entry(evlist, pos) {
286 		struct hists *hists = evsel__hists(pos);
287 
288 		/*
289 		 * unlink existing entries so that they can be linked
290 		 * in a correct order in hists__match() below.
291 		 */
292 		hists__unlink(hists);
293 
294 		if (evlist->enabled) {
295 			if (t->zero) {
296 				hists__delete_entries(hists);
297 			} else {
298 				hists__decay_entries(hists, t->hide_user_symbols,
299 						     t->hide_kernel_symbols);
300 			}
301 		}
302 
303 		hists__collapse_resort(hists, NULL);
304 
305 		/* Non-group events are considered as leader */
306 		if (symbol_conf.event_group && !evsel__is_group_leader(pos)) {
307 			struct hists *leader_hists = evsel__hists(evsel__leader(pos));
308 
309 			hists__match(leader_hists, hists);
310 			hists__link(leader_hists, hists);
311 		}
312 	}
313 
314 	evlist__for_each_entry(evlist, pos) {
315 		evsel__output_resort(pos, NULL);
316 	}
317 }
318 
319 static void perf_top__print_sym_table(struct perf_top *top)
320 {
321 	char bf[160];
322 	int printed = 0;
323 	const int win_width = top->winsize.ws_col - 1;
324 	struct evsel *evsel = top->sym_evsel;
325 	struct hists *hists = evsel__hists(evsel);
326 
327 	puts(CONSOLE_CLEAR);
328 
329 	perf_top__header_snprintf(top, bf, sizeof(bf));
330 	printf("%s\n", bf);
331 
332 	printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
333 
334 	if (!top->record_opts.overwrite &&
335 	    (top->evlist->stats.nr_lost_warned !=
336 	     top->evlist->stats.nr_events[PERF_RECORD_LOST])) {
337 		top->evlist->stats.nr_lost_warned =
338 			      top->evlist->stats.nr_events[PERF_RECORD_LOST];
339 		color_fprintf(stdout, PERF_COLOR_RED,
340 			      "WARNING: LOST %d chunks, Check IO/CPU overload",
341 			      top->evlist->stats.nr_lost_warned);
342 		++printed;
343 	}
344 
345 	if (top->sym_filter_entry) {
346 		perf_top__show_details(top);
347 		return;
348 	}
349 
350 	perf_top__resort_hists(top);
351 
352 	hists__output_recalc_col_len(hists, top->print_entries - printed);
353 	putchar('\n');
354 	hists__fprintf(hists, false, top->print_entries - printed, win_width,
355 		       top->min_percent, stdout, !symbol_conf.use_callchain);
356 }
357 
358 static void prompt_integer(int *target, const char *msg)
359 {
360 	char *buf = malloc(0), *p;
361 	size_t dummy = 0;
362 	int tmp;
363 
364 	fprintf(stdout, "\n%s: ", msg);
365 	if (getline(&buf, &dummy, stdin) < 0)
366 		return;
367 
368 	p = strchr(buf, '\n');
369 	if (p)
370 		*p = 0;
371 
372 	p = buf;
373 	while(*p) {
374 		if (!isdigit(*p))
375 			goto out_free;
376 		p++;
377 	}
378 	tmp = strtoul(buf, NULL, 10);
379 	*target = tmp;
380 out_free:
381 	free(buf);
382 }
383 
384 static void prompt_percent(int *target, const char *msg)
385 {
386 	int tmp = 0;
387 
388 	prompt_integer(&tmp, msg);
389 	if (tmp >= 0 && tmp <= 100)
390 		*target = tmp;
391 }
392 
393 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
394 {
395 	char *buf = NULL, *p;
396 	struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
397 	struct hists *hists = evsel__hists(top->sym_evsel);
398 	struct rb_node *next;
399 	size_t dummy = 0;
400 
401 	/* zero counters of active symbol */
402 	if (syme) {
403 		__zero_source_counters(syme);
404 		top->sym_filter_entry = NULL;
405 	}
406 
407 	fprintf(stdout, "\n%s: ", msg);
408 	if (getline(&buf, &dummy, stdin) < 0)
409 		goto out_free;
410 
411 	p = strchr(buf, '\n');
412 	if (p)
413 		*p = 0;
414 
415 	next = rb_first_cached(&hists->entries);
416 	while (next) {
417 		n = rb_entry(next, struct hist_entry, rb_node);
418 		if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
419 			found = n;
420 			break;
421 		}
422 		next = rb_next(&n->rb_node);
423 	}
424 
425 	if (!found) {
426 		fprintf(stderr, "Sorry, %s is not active.\n", buf);
427 		sleep(1);
428 	} else
429 		perf_top__parse_source(top, found);
430 
431 out_free:
432 	free(buf);
433 }
434 
435 static void perf_top__print_mapped_keys(struct perf_top *top)
436 {
437 	char *name = NULL;
438 
439 	if (top->sym_filter_entry) {
440 		struct symbol *sym = top->sym_filter_entry->ms.sym;
441 		name = sym->name;
442 	}
443 
444 	fprintf(stdout, "\nMapped keys:\n");
445 	fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
446 	fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
447 
448 	if (top->evlist->core.nr_entries > 1)
449 		fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", evsel__name(top->sym_evsel));
450 
451 	fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
452 
453 	fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", annotate_opts.min_pcnt);
454 	fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
455 	fprintf(stdout, "\t[S]     stop annotation.\n");
456 
457 	fprintf(stdout,
458 		"\t[K]     hide kernel symbols.             \t(%s)\n",
459 		top->hide_kernel_symbols ? "yes" : "no");
460 	fprintf(stdout,
461 		"\t[U]     hide user symbols.               \t(%s)\n",
462 		top->hide_user_symbols ? "yes" : "no");
463 	fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
464 	fprintf(stdout, "\t[qQ]    quit.\n");
465 }
466 
467 static int perf_top__key_mapped(struct perf_top *top, int c)
468 {
469 	switch (c) {
470 		case 'd':
471 		case 'e':
472 		case 'f':
473 		case 'z':
474 		case 'q':
475 		case 'Q':
476 		case 'K':
477 		case 'U':
478 		case 'F':
479 		case 's':
480 		case 'S':
481 			return 1;
482 		case 'E':
483 			return top->evlist->core.nr_entries > 1 ? 1 : 0;
484 		default:
485 			break;
486 	}
487 
488 	return 0;
489 }
490 
491 static bool perf_top__handle_keypress(struct perf_top *top, int c)
492 {
493 	bool ret = true;
494 
495 	if (!perf_top__key_mapped(top, c)) {
496 		struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
497 		struct termios save;
498 
499 		perf_top__print_mapped_keys(top);
500 		fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
501 		fflush(stdout);
502 
503 		set_term_quiet_input(&save);
504 
505 		poll(&stdin_poll, 1, -1);
506 		c = getc(stdin);
507 
508 		tcsetattr(0, TCSAFLUSH, &save);
509 		if (!perf_top__key_mapped(top, c))
510 			return ret;
511 	}
512 
513 	switch (c) {
514 		case 'd':
515 			prompt_integer(&top->delay_secs, "Enter display delay");
516 			if (top->delay_secs < 1)
517 				top->delay_secs = 1;
518 			break;
519 		case 'e':
520 			prompt_integer(&top->print_entries, "Enter display entries (lines)");
521 			if (top->print_entries == 0) {
522 				perf_top__resize(top);
523 				signal(SIGWINCH, winch_sig);
524 			} else {
525 				signal(SIGWINCH, SIG_DFL);
526 			}
527 			break;
528 		case 'E':
529 			if (top->evlist->core.nr_entries > 1) {
530 				/* Select 0 as the default event: */
531 				int counter = 0;
532 
533 				fprintf(stderr, "\nAvailable events:");
534 
535 				evlist__for_each_entry(top->evlist, top->sym_evsel)
536 					fprintf(stderr, "\n\t%d %s", top->sym_evsel->core.idx, evsel__name(top->sym_evsel));
537 
538 				prompt_integer(&counter, "Enter details event counter");
539 
540 				if (counter >= top->evlist->core.nr_entries) {
541 					top->sym_evsel = evlist__first(top->evlist);
542 					fprintf(stderr, "Sorry, no such event, using %s.\n", evsel__name(top->sym_evsel));
543 					sleep(1);
544 					break;
545 				}
546 				evlist__for_each_entry(top->evlist, top->sym_evsel)
547 					if (top->sym_evsel->core.idx == counter)
548 						break;
549 			} else
550 				top->sym_evsel = evlist__first(top->evlist);
551 			break;
552 		case 'f':
553 			prompt_integer(&top->count_filter, "Enter display event count filter");
554 			break;
555 		case 'F':
556 			prompt_percent(&annotate_opts.min_pcnt,
557 				       "Enter details display event filter (percent)");
558 			break;
559 		case 'K':
560 			top->hide_kernel_symbols = !top->hide_kernel_symbols;
561 			break;
562 		case 'q':
563 		case 'Q':
564 			printf("exiting.\n");
565 			if (top->dump_symtab)
566 				perf_session__fprintf_dsos(top->session, stderr);
567 			ret = false;
568 			break;
569 		case 's':
570 			perf_top__prompt_symbol(top, "Enter details symbol");
571 			break;
572 		case 'S':
573 			if (!top->sym_filter_entry)
574 				break;
575 			else {
576 				struct hist_entry *syme = top->sym_filter_entry;
577 
578 				top->sym_filter_entry = NULL;
579 				__zero_source_counters(syme);
580 			}
581 			break;
582 		case 'U':
583 			top->hide_user_symbols = !top->hide_user_symbols;
584 			break;
585 		case 'z':
586 			top->zero = !top->zero;
587 			break;
588 		default:
589 			break;
590 	}
591 
592 	return ret;
593 }
594 
595 static void perf_top__sort_new_samples(void *arg)
596 {
597 	struct perf_top *t = arg;
598 
599 	if (t->evlist->selected != NULL)
600 		t->sym_evsel = t->evlist->selected;
601 
602 	perf_top__resort_hists(t);
603 
604 	if (t->lost || t->drop)
605 		pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n");
606 }
607 
608 static void stop_top(void)
609 {
610 	session_done = 1;
611 	done = 1;
612 }
613 
614 static void *display_thread_tui(void *arg)
615 {
616 	struct evsel *pos;
617 	struct perf_top *top = arg;
618 	const char *help = "For a higher level overview, try: perf top --sort comm,dso";
619 	struct hist_browser_timer hbt = {
620 		.timer		= perf_top__sort_new_samples,
621 		.arg		= top,
622 		.refresh	= top->delay_secs,
623 	};
624 	int ret;
625 
626 	/* In order to read symbols from other namespaces perf to  needs to call
627 	 * setns(2).  This isn't permitted if the struct_fs has multiple users.
628 	 * unshare(2) the fs so that we may continue to setns into namespaces
629 	 * that we're observing.
630 	 */
631 	unshare(CLONE_FS);
632 
633 	prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
634 
635 repeat:
636 	perf_top__sort_new_samples(top);
637 
638 	/*
639 	 * Initialize the uid_filter_str, in the future the TUI will allow
640 	 * Zooming in/out UIDs. For now just use whatever the user passed
641 	 * via --uid.
642 	 */
643 	evlist__for_each_entry(top->evlist, pos) {
644 		struct hists *hists = evsel__hists(pos);
645 		hists->uid_filter_str = top->record_opts.target.uid_str;
646 	}
647 
648 	ret = evlist__tui_browse_hists(top->evlist, help, &hbt, top->min_percent,
649 				       &top->session->header.env, !top->record_opts.overwrite,
650 				       &annotate_opts);
651 	if (ret == K_RELOAD) {
652 		top->zero = true;
653 		goto repeat;
654 	} else
655 		stop_top();
656 
657 	return NULL;
658 }
659 
660 static void display_sig(int sig __maybe_unused)
661 {
662 	stop_top();
663 }
664 
665 static void display_setup_sig(void)
666 {
667 	signal(SIGSEGV, sighandler_dump_stack);
668 	signal(SIGFPE, sighandler_dump_stack);
669 	signal(SIGINT,  display_sig);
670 	signal(SIGQUIT, display_sig);
671 	signal(SIGTERM, display_sig);
672 }
673 
674 static void *display_thread(void *arg)
675 {
676 	struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
677 	struct termios save;
678 	struct perf_top *top = arg;
679 	int delay_msecs, c;
680 
681 	/* In order to read symbols from other namespaces perf to  needs to call
682 	 * setns(2).  This isn't permitted if the struct_fs has multiple users.
683 	 * unshare(2) the fs so that we may continue to setns into namespaces
684 	 * that we're observing.
685 	 */
686 	unshare(CLONE_FS);
687 
688 	prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
689 
690 	display_setup_sig();
691 	pthread__unblock_sigwinch();
692 repeat:
693 	delay_msecs = top->delay_secs * MSEC_PER_SEC;
694 	set_term_quiet_input(&save);
695 	/* trash return*/
696 	clearerr(stdin);
697 	if (poll(&stdin_poll, 1, 0) > 0)
698 		getc(stdin);
699 
700 	while (!done) {
701 		perf_top__print_sym_table(top);
702 		/*
703 		 * Either timeout expired or we got an EINTR due to SIGWINCH,
704 		 * refresh screen in both cases.
705 		 */
706 		switch (poll(&stdin_poll, 1, delay_msecs)) {
707 		case 0:
708 			continue;
709 		case -1:
710 			if (errno == EINTR)
711 				continue;
712 			fallthrough;
713 		default:
714 			c = getc(stdin);
715 			tcsetattr(0, TCSAFLUSH, &save);
716 
717 			if (perf_top__handle_keypress(top, c))
718 				goto repeat;
719 			stop_top();
720 		}
721 	}
722 
723 	tcsetattr(0, TCSAFLUSH, &save);
724 	return NULL;
725 }
726 
727 static int hist_iter__top_callback(struct hist_entry_iter *iter,
728 				   struct addr_location *al, bool single,
729 				   void *arg)
730 	EXCLUSIVE_LOCKS_REQUIRED(iter->he->hists->lock)
731 {
732 	struct perf_top *top = arg;
733 	struct evsel *evsel = iter->evsel;
734 
735 	if (perf_hpp_list.sym && single)
736 		perf_top__record_precise_ip(top, iter->he, iter->sample, evsel, al->addr);
737 
738 	hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
739 		     !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY),
740 		     NULL);
741 	return 0;
742 }
743 
744 static void perf_event__process_sample(struct perf_tool *tool,
745 				       const union perf_event *event,
746 				       struct evsel *evsel,
747 				       struct perf_sample *sample,
748 				       struct machine *machine)
749 {
750 	struct perf_top *top = container_of(tool, struct perf_top, tool);
751 	struct addr_location al;
752 
753 	if (!machine && perf_guest) {
754 		static struct intlist *seen;
755 
756 		if (!seen)
757 			seen = intlist__new(NULL);
758 
759 		if (!intlist__has_entry(seen, sample->pid)) {
760 			pr_err("Can't find guest [%d]'s kernel information\n",
761 				sample->pid);
762 			intlist__add(seen, sample->pid);
763 		}
764 		return;
765 	}
766 
767 	if (!machine) {
768 		pr_err("%u unprocessable samples recorded.\r",
769 		       top->session->evlist->stats.nr_unprocessable_samples++);
770 		return;
771 	}
772 
773 	if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
774 		top->exact_samples++;
775 
776 	addr_location__init(&al);
777 	if (machine__resolve(machine, &al, sample) < 0)
778 		goto out;
779 
780 	if (top->stitch_lbr)
781 		thread__set_lbr_stitch_enable(al.thread, true);
782 
783 	if (!machine->kptr_restrict_warned &&
784 	    symbol_conf.kptr_restrict &&
785 	    al.cpumode == PERF_RECORD_MISC_KERNEL) {
786 		if (!evlist__exclude_kernel(top->session->evlist)) {
787 			ui__warning(
788 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
789 "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
790 "Kernel%s samples will not be resolved.\n",
791 			  al.map && map__has_symbols(al.map) ?
792 			  " modules" : "");
793 			if (use_browser <= 0)
794 				sleep(5);
795 		}
796 		machine->kptr_restrict_warned = true;
797 	}
798 
799 	if (al.sym == NULL && al.map != NULL) {
800 		const char *msg = "Kernel samples will not be resolved.\n";
801 		/*
802 		 * As we do lazy loading of symtabs we only will know if the
803 		 * specified vmlinux file is invalid when we actually have a
804 		 * hit in kernel space and then try to load it. So if we get
805 		 * here and there are _no_ symbols in the DSO backing the
806 		 * kernel map, bail out.
807 		 *
808 		 * We may never get here, for instance, if we use -K/
809 		 * --hide-kernel-symbols, even if the user specifies an
810 		 * invalid --vmlinux ;-)
811 		 */
812 		if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
813 		    __map__is_kernel(al.map) && map__has_symbols(al.map)) {
814 			if (symbol_conf.vmlinux_name) {
815 				char serr[256];
816 
817 				dso__strerror_load(map__dso(al.map), serr, sizeof(serr));
818 				ui__warning("The %s file can't be used: %s\n%s",
819 					    symbol_conf.vmlinux_name, serr, msg);
820 			} else {
821 				ui__warning("A vmlinux file was not found.\n%s",
822 					    msg);
823 			}
824 
825 			if (use_browser <= 0)
826 				sleep(5);
827 			top->vmlinux_warned = true;
828 		}
829 	}
830 
831 	if (al.sym == NULL || !al.sym->idle) {
832 		struct hists *hists = evsel__hists(evsel);
833 		struct hist_entry_iter iter = {
834 			.evsel		= evsel,
835 			.sample 	= sample,
836 			.add_entry_cb 	= hist_iter__top_callback,
837 		};
838 
839 		if (symbol_conf.cumulate_callchain)
840 			iter.ops = &hist_iter_cumulative;
841 		else
842 			iter.ops = &hist_iter_normal;
843 
844 		mutex_lock(&hists->lock);
845 
846 		if (hist_entry_iter__add(&iter, &al, top->max_stack, top) < 0)
847 			pr_err("Problem incrementing symbol period, skipping event\n");
848 
849 		mutex_unlock(&hists->lock);
850 	}
851 
852 out:
853 	addr_location__exit(&al);
854 }
855 
856 static void
857 perf_top__process_lost(struct perf_top *top, union perf_event *event,
858 		       struct evsel *evsel)
859 {
860 	top->lost += event->lost.lost;
861 	top->lost_total += event->lost.lost;
862 	evsel->evlist->stats.total_lost += event->lost.lost;
863 }
864 
865 static void
866 perf_top__process_lost_samples(struct perf_top *top,
867 			       union perf_event *event,
868 			       struct evsel *evsel)
869 {
870 	top->lost += event->lost_samples.lost;
871 	top->lost_total += event->lost_samples.lost;
872 	evsel->evlist->stats.total_lost_samples += event->lost_samples.lost;
873 }
874 
875 static u64 last_timestamp;
876 
877 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
878 {
879 	struct record_opts *opts = &top->record_opts;
880 	struct evlist *evlist = top->evlist;
881 	struct mmap *md;
882 	union perf_event *event;
883 
884 	md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
885 	if (perf_mmap__read_init(&md->core) < 0)
886 		return;
887 
888 	while ((event = perf_mmap__read_event(&md->core)) != NULL) {
889 		int ret;
890 
891 		ret = evlist__parse_sample_timestamp(evlist, event, &last_timestamp);
892 		if (ret && ret != -1)
893 			break;
894 
895 		ret = ordered_events__queue(top->qe.in, event, last_timestamp, 0, NULL);
896 		if (ret)
897 			break;
898 
899 		perf_mmap__consume(&md->core);
900 
901 		if (top->qe.rotate) {
902 			mutex_lock(&top->qe.mutex);
903 			top->qe.rotate = false;
904 			cond_signal(&top->qe.cond);
905 			mutex_unlock(&top->qe.mutex);
906 		}
907 	}
908 
909 	perf_mmap__read_done(&md->core);
910 }
911 
912 static void perf_top__mmap_read(struct perf_top *top)
913 {
914 	bool overwrite = top->record_opts.overwrite;
915 	struct evlist *evlist = top->evlist;
916 	int i;
917 
918 	if (overwrite)
919 		evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
920 
921 	for (i = 0; i < top->evlist->core.nr_mmaps; i++)
922 		perf_top__mmap_read_idx(top, i);
923 
924 	if (overwrite) {
925 		evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
926 		evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
927 	}
928 }
929 
930 /*
931  * Check per-event overwrite term.
932  * perf top should support consistent term for all events.
933  * - All events don't have per-event term
934  *   E.g. "cpu/cpu-cycles/,cpu/instructions/"
935  *   Nothing change, return 0.
936  * - All events have same per-event term
937  *   E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
938  *   Using the per-event setting to replace the opts->overwrite if
939  *   they are different, then return 0.
940  * - Events have different per-event term
941  *   E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
942  *   Return -1
943  * - Some of the event set per-event term, but some not.
944  *   E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
945  *   Return -1
946  */
947 static int perf_top__overwrite_check(struct perf_top *top)
948 {
949 	struct record_opts *opts = &top->record_opts;
950 	struct evlist *evlist = top->evlist;
951 	struct evsel_config_term *term;
952 	struct list_head *config_terms;
953 	struct evsel *evsel;
954 	int set, overwrite = -1;
955 
956 	evlist__for_each_entry(evlist, evsel) {
957 		set = -1;
958 		config_terms = &evsel->config_terms;
959 		list_for_each_entry(term, config_terms, list) {
960 			if (term->type == EVSEL__CONFIG_TERM_OVERWRITE)
961 				set = term->val.overwrite ? 1 : 0;
962 		}
963 
964 		/* no term for current and previous event (likely) */
965 		if ((overwrite < 0) && (set < 0))
966 			continue;
967 
968 		/* has term for both current and previous event, compare */
969 		if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
970 			return -1;
971 
972 		/* no term for current event but has term for previous one */
973 		if ((overwrite >= 0) && (set < 0))
974 			return -1;
975 
976 		/* has term for current event */
977 		if ((overwrite < 0) && (set >= 0)) {
978 			/* if it's first event, set overwrite */
979 			if (evsel == evlist__first(evlist))
980 				overwrite = set;
981 			else
982 				return -1;
983 		}
984 	}
985 
986 	if ((overwrite >= 0) && (opts->overwrite != overwrite))
987 		opts->overwrite = overwrite;
988 
989 	return 0;
990 }
991 
992 static int perf_top_overwrite_fallback(struct perf_top *top,
993 				       struct evsel *evsel)
994 {
995 	struct record_opts *opts = &top->record_opts;
996 	struct evlist *evlist = top->evlist;
997 	struct evsel *counter;
998 
999 	if (!opts->overwrite)
1000 		return 0;
1001 
1002 	/* only fall back when first event fails */
1003 	if (evsel != evlist__first(evlist))
1004 		return 0;
1005 
1006 	evlist__for_each_entry(evlist, counter)
1007 		counter->core.attr.write_backward = false;
1008 	opts->overwrite = false;
1009 	pr_debug2("fall back to non-overwrite mode\n");
1010 	return 1;
1011 }
1012 
1013 static int perf_top__start_counters(struct perf_top *top)
1014 {
1015 	char msg[BUFSIZ];
1016 	struct evsel *counter;
1017 	struct evlist *evlist = top->evlist;
1018 	struct record_opts *opts = &top->record_opts;
1019 
1020 	if (perf_top__overwrite_check(top)) {
1021 		ui__error("perf top only support consistent per-event "
1022 			  "overwrite setting for all events\n");
1023 		goto out_err;
1024 	}
1025 
1026 	evlist__config(evlist, opts, &callchain_param);
1027 
1028 	evlist__for_each_entry(evlist, counter) {
1029 try_again:
1030 		if (evsel__open(counter, counter->core.cpus,
1031 				counter->core.threads) < 0) {
1032 
1033 			/*
1034 			 * Specially handle overwrite fall back.
1035 			 * Because perf top is the only tool which has
1036 			 * overwrite mode by default, support
1037 			 * both overwrite and non-overwrite mode, and
1038 			 * require consistent mode for all events.
1039 			 *
1040 			 * May move it to generic code with more tools
1041 			 * have similar attribute.
1042 			 */
1043 			if (perf_missing_features.write_backward &&
1044 			    perf_top_overwrite_fallback(top, counter))
1045 				goto try_again;
1046 
1047 			if (evsel__fallback(counter, errno, msg, sizeof(msg))) {
1048 				if (verbose > 0)
1049 					ui__warning("%s\n", msg);
1050 				goto try_again;
1051 			}
1052 
1053 			evsel__open_strerror(counter, &opts->target, errno, msg, sizeof(msg));
1054 			ui__error("%s\n", msg);
1055 			goto out_err;
1056 		}
1057 	}
1058 
1059 	if (evlist__mmap(evlist, opts->mmap_pages) < 0) {
1060 		ui__error("Failed to mmap with %d (%s)\n",
1061 			    errno, str_error_r(errno, msg, sizeof(msg)));
1062 		goto out_err;
1063 	}
1064 
1065 	return 0;
1066 
1067 out_err:
1068 	return -1;
1069 }
1070 
1071 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
1072 {
1073 	if (callchain->mode != CHAIN_NONE) {
1074 		if (callchain_register_param(callchain) < 0) {
1075 			ui__error("Can't register callchain params.\n");
1076 			return -EINVAL;
1077 		}
1078 	}
1079 
1080 	return 0;
1081 }
1082 
1083 static struct ordered_events *rotate_queues(struct perf_top *top)
1084 {
1085 	struct ordered_events *in = top->qe.in;
1086 
1087 	if (top->qe.in == &top->qe.data[1])
1088 		top->qe.in = &top->qe.data[0];
1089 	else
1090 		top->qe.in = &top->qe.data[1];
1091 
1092 	return in;
1093 }
1094 
1095 static void *process_thread(void *arg)
1096 {
1097 	struct perf_top *top = arg;
1098 
1099 	while (!done) {
1100 		struct ordered_events *out, *in = top->qe.in;
1101 
1102 		if (!in->nr_events) {
1103 			usleep(100);
1104 			continue;
1105 		}
1106 
1107 		out = rotate_queues(top);
1108 
1109 		mutex_lock(&top->qe.mutex);
1110 		top->qe.rotate = true;
1111 		cond_wait(&top->qe.cond, &top->qe.mutex);
1112 		mutex_unlock(&top->qe.mutex);
1113 
1114 		if (ordered_events__flush(out, OE_FLUSH__TOP))
1115 			pr_err("failed to process events\n");
1116 	}
1117 
1118 	return NULL;
1119 }
1120 
1121 /*
1122  * Allow only 'top->delay_secs' seconds behind samples.
1123  */
1124 static int should_drop(struct ordered_event *qevent, struct perf_top *top)
1125 {
1126 	union perf_event *event = qevent->event;
1127 	u64 delay_timestamp;
1128 
1129 	if (event->header.type != PERF_RECORD_SAMPLE)
1130 		return false;
1131 
1132 	delay_timestamp = qevent->timestamp + top->delay_secs * NSEC_PER_SEC;
1133 	return delay_timestamp < last_timestamp;
1134 }
1135 
1136 static int deliver_event(struct ordered_events *qe,
1137 			 struct ordered_event *qevent)
1138 {
1139 	struct perf_top *top = qe->data;
1140 	struct evlist *evlist = top->evlist;
1141 	struct perf_session *session = top->session;
1142 	union perf_event *event = qevent->event;
1143 	struct perf_sample sample;
1144 	struct evsel *evsel;
1145 	struct machine *machine;
1146 	int ret = -1;
1147 
1148 	if (should_drop(qevent, top)) {
1149 		top->drop++;
1150 		top->drop_total++;
1151 		return 0;
1152 	}
1153 
1154 	ret = evlist__parse_sample(evlist, event, &sample);
1155 	if (ret) {
1156 		pr_err("Can't parse sample, err = %d\n", ret);
1157 		goto next_event;
1158 	}
1159 
1160 	evsel = evlist__id2evsel(session->evlist, sample.id);
1161 	assert(evsel != NULL);
1162 
1163 	if (event->header.type == PERF_RECORD_SAMPLE) {
1164 		if (evswitch__discard(&top->evswitch, evsel))
1165 			return 0;
1166 		++top->samples;
1167 	}
1168 
1169 	switch (sample.cpumode) {
1170 	case PERF_RECORD_MISC_USER:
1171 		++top->us_samples;
1172 		if (top->hide_user_symbols)
1173 			goto next_event;
1174 		machine = &session->machines.host;
1175 		break;
1176 	case PERF_RECORD_MISC_KERNEL:
1177 		++top->kernel_samples;
1178 		if (top->hide_kernel_symbols)
1179 			goto next_event;
1180 		machine = &session->machines.host;
1181 		break;
1182 	case PERF_RECORD_MISC_GUEST_KERNEL:
1183 		++top->guest_kernel_samples;
1184 		machine = perf_session__find_machine(session,
1185 						     sample.pid);
1186 		break;
1187 	case PERF_RECORD_MISC_GUEST_USER:
1188 		++top->guest_us_samples;
1189 		/*
1190 		 * TODO: we don't process guest user from host side
1191 		 * except simple counting.
1192 		 */
1193 		goto next_event;
1194 	default:
1195 		if (event->header.type == PERF_RECORD_SAMPLE)
1196 			goto next_event;
1197 		machine = &session->machines.host;
1198 		break;
1199 	}
1200 
1201 	if (event->header.type == PERF_RECORD_SAMPLE) {
1202 		perf_event__process_sample(&top->tool, event, evsel,
1203 					   &sample, machine);
1204 	} else if (event->header.type == PERF_RECORD_LOST) {
1205 		perf_top__process_lost(top, event, evsel);
1206 	} else if (event->header.type == PERF_RECORD_LOST_SAMPLES) {
1207 		perf_top__process_lost_samples(top, event, evsel);
1208 	} else if (event->header.type < PERF_RECORD_MAX) {
1209 		events_stats__inc(&session->evlist->stats, event->header.type);
1210 		machine__process_event(machine, event, &sample);
1211 	} else
1212 		++session->evlist->stats.nr_unknown_events;
1213 
1214 	ret = 0;
1215 next_event:
1216 	return ret;
1217 }
1218 
1219 static void init_process_thread(struct perf_top *top)
1220 {
1221 	ordered_events__init(&top->qe.data[0], deliver_event, top);
1222 	ordered_events__init(&top->qe.data[1], deliver_event, top);
1223 	ordered_events__set_copy_on_queue(&top->qe.data[0], true);
1224 	ordered_events__set_copy_on_queue(&top->qe.data[1], true);
1225 	top->qe.in = &top->qe.data[0];
1226 	mutex_init(&top->qe.mutex);
1227 	cond_init(&top->qe.cond);
1228 }
1229 
1230 static void exit_process_thread(struct perf_top *top)
1231 {
1232 	ordered_events__free(&top->qe.data[0]);
1233 	ordered_events__free(&top->qe.data[1]);
1234 	mutex_destroy(&top->qe.mutex);
1235 	cond_destroy(&top->qe.cond);
1236 }
1237 
1238 static int __cmd_top(struct perf_top *top)
1239 {
1240 	struct record_opts *opts = &top->record_opts;
1241 	pthread_t thread, thread_process;
1242 	int ret;
1243 
1244 	if (!annotate_opts.objdump_path) {
1245 		ret = perf_env__lookup_objdump(&top->session->header.env,
1246 					       &annotate_opts.objdump_path);
1247 		if (ret)
1248 			return ret;
1249 	}
1250 
1251 	ret = callchain_param__setup_sample_type(&callchain_param);
1252 	if (ret)
1253 		return ret;
1254 
1255 	if (perf_session__register_idle_thread(top->session) < 0)
1256 		return ret;
1257 
1258 	if (top->nr_threads_synthesize > 1)
1259 		perf_set_multithreaded();
1260 
1261 	init_process_thread(top);
1262 
1263 	if (opts->record_namespaces)
1264 		top->tool.namespace_events = true;
1265 	if (opts->record_cgroup) {
1266 #ifdef HAVE_FILE_HANDLE
1267 		top->tool.cgroup_events = true;
1268 #else
1269 		pr_err("cgroup tracking is not supported.\n");
1270 		return -1;
1271 #endif
1272 	}
1273 
1274 	ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
1275 						&top->session->machines.host,
1276 						&top->record_opts);
1277 	if (ret < 0)
1278 		pr_debug("Couldn't synthesize BPF events: Pre-existing BPF programs won't have symbols resolved.\n");
1279 
1280 	ret = perf_event__synthesize_cgroups(&top->tool, perf_event__process,
1281 					     &top->session->machines.host);
1282 	if (ret < 0)
1283 		pr_debug("Couldn't synthesize cgroup events.\n");
1284 
1285 	machine__synthesize_threads(&top->session->machines.host, &opts->target,
1286 				    top->evlist->core.threads, true, false,
1287 				    top->nr_threads_synthesize);
1288 
1289 	perf_set_multithreaded();
1290 
1291 	if (perf_hpp_list.socket) {
1292 		ret = perf_env__read_cpu_topology_map(&perf_env);
1293 		if (ret < 0) {
1294 			char errbuf[BUFSIZ];
1295 			const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1296 
1297 			ui__error("Could not read the CPU topology map: %s\n", err);
1298 			return ret;
1299 		}
1300 	}
1301 
1302 	evlist__uniquify_name(top->evlist);
1303 	ret = perf_top__start_counters(top);
1304 	if (ret)
1305 		return ret;
1306 
1307 	top->session->evlist = top->evlist;
1308 	perf_session__set_id_hdr_size(top->session);
1309 
1310 	/*
1311 	 * When perf is starting the traced process, all the events (apart from
1312 	 * group members) have enable_on_exec=1 set, so don't spoil it by
1313 	 * prematurely enabling them.
1314 	 *
1315 	 * XXX 'top' still doesn't start workloads like record, trace, but should,
1316 	 * so leave the check here.
1317 	 */
1318         if (!target__none(&opts->target))
1319 		evlist__enable(top->evlist);
1320 
1321 	ret = -1;
1322 	if (pthread_create(&thread_process, NULL, process_thread, top)) {
1323 		ui__error("Could not create process thread.\n");
1324 		return ret;
1325 	}
1326 
1327 	if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1328 							    display_thread), top)) {
1329 		ui__error("Could not create display thread.\n");
1330 		goto out_join_thread;
1331 	}
1332 
1333 	if (top->realtime_prio) {
1334 		struct sched_param param;
1335 
1336 		param.sched_priority = top->realtime_prio;
1337 		if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1338 			ui__error("Could not set realtime priority.\n");
1339 			goto out_join;
1340 		}
1341 	}
1342 
1343 	/* Wait for a minimal set of events before starting the snapshot */
1344 	evlist__poll(top->evlist, 100);
1345 
1346 	perf_top__mmap_read(top);
1347 
1348 	while (!done) {
1349 		u64 hits = top->samples;
1350 
1351 		perf_top__mmap_read(top);
1352 
1353 		if (opts->overwrite || (hits == top->samples))
1354 			ret = evlist__poll(top->evlist, 100);
1355 
1356 		if (resize) {
1357 			perf_top__resize(top);
1358 			resize = 0;
1359 		}
1360 	}
1361 
1362 	ret = 0;
1363 out_join:
1364 	pthread_join(thread, NULL);
1365 out_join_thread:
1366 	cond_signal(&top->qe.cond);
1367 	pthread_join(thread_process, NULL);
1368 	perf_set_singlethreaded();
1369 	exit_process_thread(top);
1370 	return ret;
1371 }
1372 
1373 static int
1374 callchain_opt(const struct option *opt, const char *arg, int unset)
1375 {
1376 	symbol_conf.use_callchain = true;
1377 	return record_callchain_opt(opt, arg, unset);
1378 }
1379 
1380 static int
1381 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1382 {
1383 	struct callchain_param *callchain = opt->value;
1384 
1385 	callchain->enabled = !unset;
1386 	callchain->record_mode = CALLCHAIN_FP;
1387 
1388 	/*
1389 	 * --no-call-graph
1390 	 */
1391 	if (unset) {
1392 		symbol_conf.use_callchain = false;
1393 		callchain->record_mode = CALLCHAIN_NONE;
1394 		return 0;
1395 	}
1396 
1397 	return parse_callchain_top_opt(arg);
1398 }
1399 
1400 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1401 {
1402 	if (!strcmp(var, "top.call-graph")) {
1403 		var = "call-graph.record-mode";
1404 		return perf_default_config(var, value, cb);
1405 	}
1406 	if (!strcmp(var, "top.children")) {
1407 		symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1408 		return 0;
1409 	}
1410 
1411 	return 0;
1412 }
1413 
1414 static int
1415 parse_percent_limit(const struct option *opt, const char *arg,
1416 		    int unset __maybe_unused)
1417 {
1418 	struct perf_top *top = opt->value;
1419 
1420 	top->min_percent = strtof(arg, NULL);
1421 	return 0;
1422 }
1423 
1424 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1425 	"\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1426 
1427 int cmd_top(int argc, const char **argv)
1428 {
1429 	char errbuf[BUFSIZ];
1430 	struct perf_top top = {
1431 		.count_filter	     = 5,
1432 		.delay_secs	     = 2,
1433 		.record_opts = {
1434 			.mmap_pages	= UINT_MAX,
1435 			.user_freq	= UINT_MAX,
1436 			.user_interval	= ULLONG_MAX,
1437 			.freq		= 4000, /* 4 KHz */
1438 			.target		= {
1439 				.uses_mmap   = true,
1440 			},
1441 			/*
1442 			 * FIXME: This will lose PERF_RECORD_MMAP and other metadata
1443 			 * when we pause, fix that and reenable. Probably using a
1444 			 * separate evlist with a dummy event, i.e. a non-overwrite
1445 			 * ring buffer just for metadata events, while PERF_RECORD_SAMPLE
1446 			 * stays in overwrite mode. -acme
1447 			 * */
1448 			.overwrite	= 0,
1449 			.sample_time	= true,
1450 			.sample_time_set = true,
1451 		},
1452 		.max_stack	     = sysctl__max_stack(),
1453 		.nr_threads_synthesize = UINT_MAX,
1454 	};
1455 	struct parse_events_option_args parse_events_option_args = {
1456 		.evlistp = &top.evlist,
1457 	};
1458 	bool branch_call_mode = false;
1459 	struct record_opts *opts = &top.record_opts;
1460 	struct target *target = &opts->target;
1461 	const char *disassembler_style = NULL, *objdump_path = NULL, *addr2line_path = NULL;
1462 	const struct option options[] = {
1463 	OPT_CALLBACK('e', "event", &parse_events_option_args, "event",
1464 		     "event selector. use 'perf list' to list available events",
1465 		     parse_events_option),
1466 	OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1467 	OPT_STRING('p', "pid", &target->pid, "pid",
1468 		    "profile events on existing process id"),
1469 	OPT_STRING('t', "tid", &target->tid, "tid",
1470 		    "profile events on existing thread id"),
1471 	OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1472 			    "system-wide collection from all CPUs"),
1473 	OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1474 		    "list of cpus to monitor"),
1475 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1476 		   "file", "vmlinux pathname"),
1477 	OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1478 		    "don't load vmlinux even if found"),
1479 	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1480 		   "file", "kallsyms pathname"),
1481 	OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1482 		    "hide kernel symbols"),
1483 	OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1484 		     "number of mmap data pages", evlist__parse_mmap_pages),
1485 	OPT_INTEGER('r', "realtime", &top.realtime_prio,
1486 		    "collect data with this RT SCHED_FIFO priority"),
1487 	OPT_INTEGER('d', "delay", &top.delay_secs,
1488 		    "number of seconds to delay between refreshes"),
1489 	OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1490 			    "dump the symbol table used for profiling"),
1491 	OPT_INTEGER('f', "count-filter", &top.count_filter,
1492 		    "only display functions with more events than this"),
1493 	OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1494 		    "child tasks do not inherit counters"),
1495 	OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1496 		    "symbol to annotate"),
1497 	OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1498 	OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
1499 		     "profile at this frequency",
1500 		      record__parse_freq),
1501 	OPT_INTEGER('E', "entries", &top.print_entries,
1502 		    "display this many functions"),
1503 	OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1504 		    "hide user symbols"),
1505 #ifdef HAVE_SLANG_SUPPORT
1506 	OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1507 #endif
1508 	OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1509 	OPT_INCR('v', "verbose", &verbose,
1510 		    "be more verbose (show counter open errors, etc)"),
1511 	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1512 		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1513 		   " Please refer the man page for the complete list."),
1514 	OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1515 		   "output field(s): overhead, period, sample plus all of sort keys"),
1516 	OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1517 		    "Show a column with the number of samples"),
1518 	OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1519 			   NULL, "enables call-graph recording and display",
1520 			   &callchain_opt),
1521 	OPT_CALLBACK(0, "call-graph", &callchain_param,
1522 		     "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1523 		     top_callchain_help, &parse_callchain_opt),
1524 	OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1525 		    "Accumulate callchains of children and show total overhead as well"),
1526 	OPT_INTEGER(0, "max-stack", &top.max_stack,
1527 		    "Set the maximum stack depth when parsing the callchain. "
1528 		    "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1529 	OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1530 		   "ignore callees of these functions in call graphs",
1531 		   report_parse_ignore_callees_opt),
1532 	OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1533 		    "Show a column with the sum of periods"),
1534 	OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1535 		   "only consider symbols in these dsos"),
1536 	OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1537 		   "only consider symbols in these comms"),
1538 	OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1539 		   "only consider these symbols"),
1540 	OPT_BOOLEAN(0, "source", &annotate_opts.annotate_src,
1541 		    "Interleave source code with assembly code (default)"),
1542 	OPT_BOOLEAN(0, "asm-raw", &annotate_opts.show_asm_raw,
1543 		    "Display raw encoding of assembly instructions (default)"),
1544 	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1545 		    "Enable kernel symbol demangling"),
1546 	OPT_BOOLEAN(0, "no-bpf-event", &top.record_opts.no_bpf_event, "do not record bpf events"),
1547 	OPT_STRING(0, "objdump", &objdump_path, "path",
1548 		    "objdump binary to use for disassembly and annotations"),
1549 	OPT_STRING(0, "addr2line", &addr2line_path, "path",
1550 		   "addr2line binary to use for line numbers"),
1551 	OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1552 		   "Specify disassembler style (e.g. -M intel for intel syntax)"),
1553 	OPT_STRING(0, "prefix", &annotate_opts.prefix, "prefix",
1554 		    "Add prefix to source file path names in programs (with --prefix-strip)"),
1555 	OPT_STRING(0, "prefix-strip", &annotate_opts.prefix_strip, "N",
1556 		    "Strip first N entries of source file path name in programs (with --prefix)"),
1557 	OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1558 	OPT_CALLBACK(0, "percent-limit", &top, "percent",
1559 		     "Don't show entries under that percent", parse_percent_limit),
1560 	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1561 		     "How to display percentage of filtered entries", parse_filter_percentage),
1562 	OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1563 		   "width[,width...]",
1564 		   "don't try to adjust column width, use these fixed values"),
1565 	OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1566 			"per thread proc mmap processing timeout in ms"),
1567 	OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1568 		     "branch any", "sample any taken branches",
1569 		     parse_branch_stack),
1570 	OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1571 		     "branch filter mask", "branch stack filter modes",
1572 		     parse_branch_stack),
1573 	OPT_BOOLEAN(0, "branch-history", &branch_call_mode,
1574 		    "add last branch records to call history"),
1575 	OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1576 		    "Show raw trace event output (do not use print fmt or plugins)"),
1577 	OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1578 		    "Show entries in a hierarchy"),
1579 	OPT_BOOLEAN(0, "overwrite", &top.record_opts.overwrite,
1580 		    "Use a backward ring buffer, default: no"),
1581 	OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
1582 	OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
1583 			"number of thread to run event synthesize"),
1584 	OPT_CALLBACK('G', "cgroup", &top.evlist, "name",
1585 		     "monitor event in cgroup name only", parse_cgroups),
1586 	OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces,
1587 		    "Record namespaces events"),
1588 	OPT_BOOLEAN(0, "all-cgroups", &opts->record_cgroup,
1589 		    "Record cgroup events"),
1590 	OPT_INTEGER(0, "group-sort-idx", &symbol_conf.group_sort_idx,
1591 		    "Sort the output by the event at the index n in group. "
1592 		    "If n is invalid, sort by the first event. "
1593 		    "WARNING: should be used on grouped events."),
1594 	OPT_BOOLEAN(0, "stitch-lbr", &top.stitch_lbr,
1595 		    "Enable LBR callgraph stitching approach"),
1596 #ifdef HAVE_LIBPFM
1597 	OPT_CALLBACK(0, "pfm-events", &top.evlist, "event",
1598 		"libpfm4 event selector. use 'perf list' to list available events",
1599 		parse_libpfm_events_option),
1600 #endif
1601 	OPTS_EVSWITCH(&top.evswitch),
1602 	OPT_END()
1603 	};
1604 	const char * const top_usage[] = {
1605 		"perf top [<options>]",
1606 		NULL
1607 	};
1608 	int status = hists__init();
1609 
1610 	if (status < 0)
1611 		return status;
1612 
1613 	annotation_options__init(&annotate_opts);
1614 
1615 	annotate_opts.min_pcnt = 5;
1616 	annotate_opts.context  = 4;
1617 
1618 	top.evlist = evlist__new();
1619 	if (top.evlist == NULL)
1620 		return -ENOMEM;
1621 
1622 	status = perf_config(perf_top_config, &top);
1623 	if (status)
1624 		return status;
1625 	/*
1626 	 * Since the per arch annotation init routine may need the cpuid, read
1627 	 * it here, since we are not getting this from the perf.data header.
1628 	 */
1629 	status = perf_env__read_cpuid(&perf_env);
1630 	if (status) {
1631 		/*
1632 		 * Some arches do not provide a get_cpuid(), so just use pr_debug, otherwise
1633 		 * warn the user explicitly.
1634 		 */
1635 		eprintf(status == ENOSYS ? 1 : 0, verbose,
1636 			"Couldn't read the cpuid for this machine: %s\n",
1637 			str_error_r(errno, errbuf, sizeof(errbuf)));
1638 	}
1639 	top.evlist->env = &perf_env;
1640 
1641 	argc = parse_options(argc, argv, options, top_usage, 0);
1642 	if (argc)
1643 		usage_with_options(top_usage, options);
1644 
1645 	if (disassembler_style) {
1646 		annotate_opts.disassembler_style = strdup(disassembler_style);
1647 		if (!annotate_opts.disassembler_style)
1648 			return -ENOMEM;
1649 	}
1650 	if (objdump_path) {
1651 		annotate_opts.objdump_path = strdup(objdump_path);
1652 		if (!annotate_opts.objdump_path)
1653 			return -ENOMEM;
1654 	}
1655 	if (addr2line_path) {
1656 		symbol_conf.addr2line_path = strdup(addr2line_path);
1657 		if (!symbol_conf.addr2line_path)
1658 			return -ENOMEM;
1659 	}
1660 
1661 	status = symbol__validate_sym_arguments();
1662 	if (status)
1663 		goto out_delete_evlist;
1664 
1665 	if (annotate_check_args(&annotate_opts) < 0)
1666 		goto out_delete_evlist;
1667 
1668 	if (!top.evlist->core.nr_entries) {
1669 		bool can_profile_kernel = perf_event_paranoid_check(1);
1670 		int err = parse_event(top.evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
1671 
1672 		if (err)
1673 			goto out_delete_evlist;
1674 	}
1675 
1676 	status = evswitch__init(&top.evswitch, top.evlist, stderr);
1677 	if (status)
1678 		goto out_delete_evlist;
1679 
1680 	if (symbol_conf.report_hierarchy) {
1681 		/* disable incompatible options */
1682 		symbol_conf.event_group = false;
1683 		symbol_conf.cumulate_callchain = false;
1684 
1685 		if (field_order) {
1686 			pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1687 			parse_options_usage(top_usage, options, "fields", 0);
1688 			parse_options_usage(NULL, options, "hierarchy", 0);
1689 			goto out_delete_evlist;
1690 		}
1691 	}
1692 
1693 	if (top.stitch_lbr && !(callchain_param.record_mode == CALLCHAIN_LBR)) {
1694 		pr_err("Error: --stitch-lbr must be used with --call-graph lbr\n");
1695 		goto out_delete_evlist;
1696 	}
1697 
1698 	if (nr_cgroups > 0 && opts->record_cgroup) {
1699 		pr_err("--cgroup and --all-cgroups cannot be used together\n");
1700 		goto out_delete_evlist;
1701 	}
1702 
1703 	if (branch_call_mode) {
1704 		if (!opts->branch_stack)
1705 			opts->branch_stack = PERF_SAMPLE_BRANCH_ANY;
1706 		symbol_conf.use_callchain = true;
1707 		callchain_param.key = CCKEY_ADDRESS;
1708 		callchain_param.branch_callstack = true;
1709 		callchain_param.enabled = true;
1710 		if (callchain_param.record_mode == CALLCHAIN_NONE)
1711 			callchain_param.record_mode = CALLCHAIN_FP;
1712 		callchain_register_param(&callchain_param);
1713 		if (!sort_order)
1714 			sort_order = "srcline,symbol,dso";
1715 	}
1716 
1717 	if (opts->branch_stack && callchain_param.enabled)
1718 		symbol_conf.show_branchflag_count = true;
1719 
1720 	sort__mode = SORT_MODE__TOP;
1721 	/* display thread wants entries to be collapsed in a different tree */
1722 	perf_hpp_list.need_collapse = 1;
1723 
1724 	if (top.use_stdio)
1725 		use_browser = 0;
1726 #ifdef HAVE_SLANG_SUPPORT
1727 	else if (top.use_tui)
1728 		use_browser = 1;
1729 #endif
1730 
1731 	setup_browser(false);
1732 
1733 	if (setup_sorting(top.evlist) < 0) {
1734 		if (sort_order)
1735 			parse_options_usage(top_usage, options, "s", 1);
1736 		if (field_order)
1737 			parse_options_usage(sort_order ? NULL : top_usage,
1738 					    options, "fields", 0);
1739 		goto out_delete_evlist;
1740 	}
1741 
1742 	status = target__validate(target);
1743 	if (status) {
1744 		target__strerror(target, status, errbuf, BUFSIZ);
1745 		ui__warning("%s\n", errbuf);
1746 	}
1747 
1748 	status = target__parse_uid(target);
1749 	if (status) {
1750 		int saved_errno = errno;
1751 
1752 		target__strerror(target, status, errbuf, BUFSIZ);
1753 		ui__error("%s\n", errbuf);
1754 
1755 		status = -saved_errno;
1756 		goto out_delete_evlist;
1757 	}
1758 
1759 	if (target__none(target))
1760 		target->system_wide = true;
1761 
1762 	if (evlist__create_maps(top.evlist, target) < 0) {
1763 		ui__error("Couldn't create thread/CPU maps: %s\n",
1764 			  errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1765 		status = -errno;
1766 		goto out_delete_evlist;
1767 	}
1768 
1769 	if (top.delay_secs < 1)
1770 		top.delay_secs = 1;
1771 
1772 	if (record_opts__config(opts)) {
1773 		status = -EINVAL;
1774 		goto out_delete_evlist;
1775 	}
1776 
1777 	top.sym_evsel = evlist__first(top.evlist);
1778 
1779 	if (!callchain_param.enabled) {
1780 		symbol_conf.cumulate_callchain = false;
1781 		perf_hpp__cancel_cumulate();
1782 	}
1783 
1784 	if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1785 		callchain_param.order = ORDER_CALLER;
1786 
1787 	status = symbol__annotation_init();
1788 	if (status < 0)
1789 		goto out_delete_evlist;
1790 
1791 	annotation_config__init(&annotate_opts);
1792 
1793 	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1794 	status = symbol__init(NULL);
1795 	if (status < 0)
1796 		goto out_delete_evlist;
1797 
1798 	sort__setup_elide(stdout);
1799 
1800 	get_term_dimensions(&top.winsize);
1801 	if (top.print_entries == 0) {
1802 		perf_top__update_print_entries(&top);
1803 		signal(SIGWINCH, winch_sig);
1804 	}
1805 
1806 	top.session = perf_session__new(NULL, NULL);
1807 	if (IS_ERR(top.session)) {
1808 		status = PTR_ERR(top.session);
1809 		top.session = NULL;
1810 		goto out_delete_evlist;
1811 	}
1812 
1813 #ifdef HAVE_LIBBPF_SUPPORT
1814 	if (!top.record_opts.no_bpf_event) {
1815 		top.sb_evlist = evlist__new();
1816 
1817 		if (top.sb_evlist == NULL) {
1818 			pr_err("Couldn't create side band evlist.\n.");
1819 			status = -EINVAL;
1820 			goto out_delete_evlist;
1821 		}
1822 
1823 		if (evlist__add_bpf_sb_event(top.sb_evlist, &perf_env)) {
1824 			pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1825 			status = -EINVAL;
1826 			goto out_delete_evlist;
1827 		}
1828 	}
1829 #endif
1830 
1831 	if (evlist__start_sb_thread(top.sb_evlist, target)) {
1832 		pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1833 		opts->no_bpf_event = true;
1834 	}
1835 
1836 	status = __cmd_top(&top);
1837 
1838 	if (!opts->no_bpf_event)
1839 		evlist__stop_sb_thread(top.sb_evlist);
1840 
1841 out_delete_evlist:
1842 	evlist__delete(top.evlist);
1843 	perf_session__delete(top.session);
1844 	annotation_options__exit(&annotate_opts);
1845 
1846 	return status;
1847 }
1848