// SPDX-License-Identifier: GPL-2.0-only
/*
* builtin-top.c
*
* Builtin top command: Display a continuously updated profile of
* any workload, CPU or specific PID.
*
* Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
* 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
*
* Improvements and fixes by:
*
* Arjan van de Ven <arjan@linux.intel.com>
* Yanmin Zhang <yanmin.zhang@intel.com>
* Wu Fengguang <fengguang.wu@intel.com>
* Mike Galbraith <efault@gmx.de>
* Paul Mackerras <paulus@samba.org>
*/
#include "builtin.h"
#include "perf.h"
#include "util/annotate.h"
#include "util/bpf-event.h"
#include "util/config.h"
#include "util/color.h"
#include "util/dso.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/evsel_config.h"
#include "util/event.h"
#include "util/machine.h"
#include "util/map.h"
#include "util/mmap.h"
#include "util/session.h"
#include "util/symbol.h"
#include "util/synthetic-events.h"
#include "util/top.h"
#include "util/util.h"
#include <linux/rbtree.h>
#include <subcmd/parse-options.h>
#include "util/parse-events.h"
#include "util/callchain.h"
#include "util/cpumap.h"
#include "util/sort.h"
#include "util/string2.h"
#include "util/term.h"
#include "util/intlist.h"
#include "util/parse-branch-options.h"
#include "arch/common.h"
#include "ui/ui.h"
#include "util/debug.h"
#include "util/ordered-events.h"
#include <assert.h>
#include <elf.h>
#include <fcntl.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <inttypes.h>
#include <errno.h>
#include <time.h>
#include <sched.h>
#include <signal.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <poll.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <linux/stringify.h>
#include <linux/time64.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/ctype.h>
static volatile int done;
static volatile int resize;
#define HEADER_LINE_NR 5
static void perf_top__update_print_entries(struct perf_top *top)
{
top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
}
static void winch_sig(int sig __maybe_unused)
{
resize = 1;
}
static void perf_top__resize(struct perf_top *top)
{
get_term_dimensions(&top->winsize);
perf_top__update_print_entries(top);
}
static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
{
struct evsel *evsel;
struct symbol *sym;
struct annotation *notes;
struct map *map;
int err = -1;
if (!he || !he->ms.sym)
return -1;
evsel = hists_to_evsel(he->hists);
sym = he->ms.sym;
map = he->ms.map;
/*
* We can't annotate with just /proc/kallsyms
*/
if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
!dso__is_kcore(map->dso)) {
pr_err("Can't annotate %s: No vmlinux file was found in the "
"path\n", sym->name);
sleep(1);
return -1;
}
notes = symbol__annotation(sym);
pthread_mutex_lock(¬es->lock);
if (!symbol__hists(sym, top->evlist->core.nr_entries)) {
pthread_mutex_unlock(¬es->lock);
pr_err("Not enough memory for annotating '%s' symbol!\n",
sym->name);
sleep(1);
return err;
}
err = symbol__annotate(sym, map, evsel, 0, &top->annotation_opts, NULL);
if (err == 0) {
top->sym_filter_entry = he;
} else {
char msg[BUFSIZ];
symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
}
pthread_mutex_unlock(¬es->lock);
return err;
}
static void __zero_source_counters(struct hist_entry *he)
{
struct symbol *sym = he->ms.sym;
symbol__annotate_zero_histograms(sym);
}
static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
{
struct utsname uts;
int err = uname(&uts);
ui__warning("Out of bounds address found:\n\n"
"Addr: %" PRIx64 "\n"
"DSO: %s %c\n"
"Map: %" PRIx64 "-%" PRIx64 "\n"
"Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
"Arch: %s\n"
"Kernel: %s\n"
"Tools: %s\n\n"
"Not all samples will be on the annotation output.\n\n"
"Please report to linux-kernel@vger.kernel.org\n",
ip, map->dso->long_name, dso__symtab_origin(map->dso),
map->start, map->end, sym->start, sym->end,
sym->binding == STB_GLOBAL ? 'g' :
sym->binding == STB_LOCAL ? 'l' : 'w', sym->name,
err ? "[unknown]" : uts.machine,
err ? "[unknown]" : uts.release, perf_version_string);
if (use_browser <= 0)
sleep(5);
map->erange_warned = true;
}
static void perf_top__record_precise_ip(struct perf_top *top,
struct hist_entry *he,
struct perf_sample *sample,
struct evsel *evsel, u64 ip)
{
struct annotation *notes;
struct symbol *sym = he->ms.sym;
int err = 0;
if (sym == NULL || (use_browser == 0 &&
(top->sym_filter_entry == NULL ||
top->sym_filter_entry->ms.sym != sym)))
return;
notes = symbol__annotation(sym);
if (pthread_mutex_trylock(¬es->lock))
return;
err = hist_entry__inc_addr_samples(he, sample, evsel, ip);
pthread_mutex_unlock(¬es->lock);
if (unlikely(err)) {
/*
* This function is now called with he->hists->lock held.
* Release it before going to sleep.
*/
pthread_mutex_unlock(&he->hists->lock);
if (err == -ERANGE && !he->ms.map->erange_warned)
ui__warn_map_erange(he->ms.map, sym, ip);
else if (err == -ENOMEM) {
pr_err("Not enough memory for annotating '%s' symbol!\n",
sym->name);
sleep(1);
}
pthread_mutex_lock(&he->hists->lock);
}
}
static void perf_top__show_details(struct perf_top *top)
{
struct hist_entry *he = top->sym_filter_entry;
struct evsel *evsel;
struct annotation *notes;
struct symbol *symbol;
int more;
if (!he)
return;
evsel = hists_to_evsel(he->hists);
symbol = he->ms.sym;
notes = symbol__annotation(symbol);
pthread_mutex_lock(¬es->lock);
symbol__calc_percent(symbol, evsel);
if (notes->src == NULL)
goto out_unlock;
printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
printf(" Events Pcnt (>=%d%%)\n", top->annotation_opts.min_pcnt);
more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel, &top->annotation_opts);
if (top->evlist->enabled) {
if (top->zero)
symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
else
symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
}
if (more != 0)
printf("%d lines not displayed, maybe increase display entries [e]\n", more);
out_unlock:
pthread_mutex_unlock(¬es->lock);
}
static void perf_top__resort_hists(struct perf_top *t)
{
struct evlist *evlist = t->evlist;
struct evsel *pos;
evlist__for_each_entry(evlist, pos) {
struct hists *hists = evsel__hists(pos);
/*
* unlink existing entries so that they can be linked
* in a correct order in hists__match() below.
*/
hists__unlink(hists);
if (evlist->enabled) {
if (t->zero) {
hists__delete_entries(hists);
} else {
hists__decay_entries(hists, t->hide_user_symbols,
t->hide_kernel_symbols);
}
}
hists__collapse_resort(hists, NULL);
/* Non-group events are considered as leader */
if (symbol_conf.event_group &&
!perf_evsel__is_group_leader(pos)) {
struct hists *leader_hists = evsel__hists(pos->leader);
hists__match(leader_hists, hists);
hists__link(leader_hists, hists);
}
}
evlist__for_each_entry(evlist, pos) {
perf_evsel__output_resort(pos, NULL);
}
}
static void perf_top__print_sym_table(struct perf_top *top)
{
char bf[160];
int printed = 0;
const int win_width = top->winsize.ws_col - 1;
struct evsel *evsel = top->sym_evsel;
struct hists *hists = evsel__hists(evsel);
puts(CONSOLE_CLEAR);
perf_top__header_snprintf(top, bf, sizeof(bf));
printf("%s\n", bf);
printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
if (!top->record_opts.overwrite &&
(hists->stats.nr_lost_warned !=
hists->stats.nr_events[PERF_RECORD_LOST])) {
hists->stats.nr_lost_warned =
hists->stats.nr_events[PERF_RECORD_LOST];
color_fprintf(stdout, PERF_COLOR_RED,
"WARNING: LOST %d chunks, Check IO/CPU overload",
hists->stats.nr_lost_warned);
++printed;
}
if (top->sym_filter_entry) {
perf_top__show_details(top);
return;
}
perf_top__resort_hists(top);
hists__output_recalc_col_len(hists, top->print_entries - printed);
putchar('\n');
hists__fprintf(hists, false, top->print_entries - printed, win_width,
top->min_percent, stdout, !symbol_conf.use_callchain);
}
static void prompt_integer(int *target, const char *msg)
{
char *buf = malloc(0), *p;
size_t dummy = 0;
int tmp;
fprintf(stdout, "\n%s: ", msg);
if (getline(&buf, &dummy, stdin) < 0)
return;
p = strchr(buf, '\n');
if (p)
*p = 0;
p = buf;
while(*p) {
if (!isdigit(*p))
goto out_free;
p++;
}
tmp = strtoul(buf, NULL, 10);
*target = tmp;
out_free:
free(buf);
}
static void prompt_percent(int *target, const char *msg)
{
int tmp = 0;
prompt_integer(&tmp, msg);
if (tmp >= 0 && tmp <= 100)
*target = tmp;
}
static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
{
char *buf = malloc(0), *p;
struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
struct hists *hists = evsel__hists(top->sym_evsel);
struct rb_node *next;
size_t dummy = 0;
/* zero counters of active symbol */
if (syme) {
__zero_source_counters(syme);
top->sym_filter_entry = NULL;
}
fprintf(stdout, "\n%s: ", msg);
if (getline(&buf, &dummy, stdin) < 0)
goto out_free;
p = strchr(buf, '\n');
if (p)
*p = 0;
next = rb_first_cached(&hists->entries);
while (next) {
n = rb_entry(next, struct hist_entry, rb_node);
if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
found = n;
break;
}
next = rb_next(&n->rb_node);
}
if (!found) {
fprintf(stderr, "Sorry, %s is not active.\n", buf);
sleep(1);
} else
perf_top__parse_source(top, found);
out_free:
free(buf);
}
static void perf_top__print_mapped_keys(struct perf_top *top)
{
char *name = NULL;
if (top->sym_filter_entry) {
struct symbol *sym = top->sym_filter_entry->ms.sym;
name = sym->name;
}
fprintf(stdout, "\nMapped keys:\n");
fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", top->delay_secs);
fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", top->print_entries);
if (top->evlist->core.nr_entries > 1)
fprintf(stdout, "\t[E] active event counter. \t(%s)\n", perf_evsel__name(top->sym_evsel));
fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", top->count_filter);
fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", top->annotation_opts.min_pcnt);
fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
fprintf(stdout, "\t[S] stop annotation.\n");
fprintf(stdout,
"\t[K] hide kernel symbols. \t(%s)\n",
top->hide_kernel_symbols ? "yes" : "no");
fprintf(stdout,
"\t[U] hide user symbols. \t(%s)\n",
top->hide_user_symbols ? "yes" : "no");
fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", top->zero ? 1 : 0);
fprintf(stdout, "\t[qQ] quit.\n");
}
static int perf_top__key_mapped(struct perf_top *top, int c)
{
switch (c) {
case 'd':
case 'e':
case 'f':
case 'z':
case 'q':
case 'Q':
case 'K':
case 'U':
case 'F':
case 's':
case 'S':
return 1;
case 'E':
return top->evlist->core.nr_entries > 1 ? 1 : 0;
default:
break;
}
return 0;
}
static bool perf_top__handle_keypress(struct perf_top *top, int c)
{
bool ret = true;
if (!perf_top__key_mapped(top, c)) {
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
struct termios save;
perf_top__print_mapped_keys(top);
fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
fflush(stdout);
set_term_quiet_input(&save);
poll(&stdin_poll, 1, -1);
c = getc(stdin);
tcsetattr(0, TCSAFLUSH, &save);
if (!perf_top__key_mapped(top, c))
return ret;
}
switch (c) {
case 'd':
prompt_integer(&top->delay_secs, "Enter display delay");
if (top->delay_secs < 1)
top->delay_secs = 1;
break;
case 'e':
prompt_integer(&top->print_entries, "Enter display entries (lines)");
if (top->print_entries == 0) {
perf_top__resize(top);
signal(SIGWINCH, winch_sig);
} else {
signal(SIGWINCH, SIG_DFL);
}
break;
case 'E':
if (top->evlist->core.nr_entries > 1) {
/* Select 0 as the default event: */
int counter = 0;
fprintf(stderr, "\nAvailable events:");
evlist__for_each_entry(top->evlist, top->sym_evsel)
fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
prompt_integer(&counter, "Enter details event counter");
if (counter >= top->evlist->core.nr_entries) {
top->sym_evsel = evlist__first(top->evlist);
fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
sleep(1);
break;
}
evlist__for_each_entry(top->evlist, top->sym_evsel)
if (top->sym_evsel->idx == counter)
break;
} else
top->sym_evsel = evlist__first(top->evlist);
break;
case 'f':
prompt_integer(&top->count_filter, "Enter display event count filter");
break;
case 'F':
prompt_percent(&top->annotation_opts.min_pcnt,
"Enter details display event filter (percent)");
break;
case 'K':
top->hide_kernel_symbols = !top->hide_kernel_symbols;
break;
case 'q':
case 'Q':
printf("exiting.\n");
if (top->dump_symtab)
perf_session__fprintf_dsos(top->session, stderr);
ret = false;
break;
case 's':
perf_top__prompt_symbol(top, "Enter details symbol");
break;
case 'S':
if (!top->sym_filter_entry)
break;
else {
struct hist_entry *syme = top->sym_filter_entry;
top->sym_filter_entry = NULL;
__zero_source_counters(syme);
}
break;
case 'U':
top->hide_user_symbols = !top->hide_user_symbols;
break;
case 'z':
top->zero = !top->zero;
break;
default:
break;
}
return ret;
}
static void perf_top__sort_new_samples(void *arg)
{
struct perf_top *t = arg;
if (t->evlist->selected != NULL)
t->sym_evsel = t->evlist->selected;
perf_top__resort_hists(t);
if (t->lost || t->drop)
pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n");
}
static void stop_top(void)
{
session_done = 1;
done = 1;
}
static void *display_thread_tui(void *arg)
{
struct evsel *pos;
struct perf_top *top = arg;
const char *help = "For a higher level overview, try: perf top --sort comm,dso";
struct hist_browser_timer hbt = {
.timer = perf_top__sort_new_samples,
.arg = top,
.refresh = top->delay_secs,
};
/* In order to read symbols from other namespaces perf to needs to call
* setns(2). This isn't permitted if the struct_fs has multiple users.
* unshare(2) the fs so that we may continue to setns into namespaces
* that we're observing.
*/
unshare(CLONE_FS);
prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
perf_top__sort_new_samples(top);
/*
* Initialize the uid_filter_str, in the future the TUI will allow
* Zooming in/out UIDs. For now just use whatever the user passed
* via --uid.
*/
evlist__for_each_entry(top->evlist, pos) {
struct hists *hists = evsel__hists(pos);
hists->uid_filter_str = top->record_opts.target.uid_str;
}
perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
top->min_percent,
&top->session->header.env,
!top->record_opts.overwrite,
&top->annotation_opts);
stop_top();
return NULL;
}
static void display_sig(int sig __maybe_unused)
{
stop_top();
}
static void display_setup_sig(void)
{
signal(SIGSEGV, sighandler_dump_stack);
signal(SIGFPE, sighandler_dump_stack);
signal(SIGINT, display_sig);
signal(SIGQUIT, display_sig);
signal(SIGTERM, display_sig);
}
static void *display_thread(void *arg)
{
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
struct termios save;
struct perf_top *top = arg;
int delay_msecs, c;
/* In order to read symbols from other namespaces perf to needs to call
* setns(2). This isn't permitted if the struct_fs has multiple users.
* unshare(2) the fs so that we may continue to setns into namespaces
* that we're observing.
*/
unshare(CLONE_FS);
prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
display_setup_sig();
pthread__unblock_sigwinch();
repeat:
delay_msecs = top->delay_secs * MSEC_PER_SEC;
set_term_quiet_input(&save);
/* trash return*/
getc(stdin);
while (!done) {
perf_top__print_sym_table(top);
/*
* Either timeout expired or we got an EINTR due to SIGWINCH,
* refresh screen in both cases.
*/
switch (poll(&stdin_poll, 1, delay_msecs)) {
case 0:
continue;
case -1:
if (errno == EINTR)
continue;
__fallthrough;
default:
c = getc(stdin);
tcsetattr(0, TCSAFLUSH, &save);
if (perf_top__handle_keypress(top, c))
goto repeat;
stop_top();
}
}
tcsetattr(0, TCSAFLUSH, &save);
return NULL;
}
static int hist_iter__top_callback(struct hist_entry_iter *iter,
struct addr_location *al, bool single,
void *arg)
{
struct perf_top *top = arg;
struct hist_entry *he = iter->he;
struct evsel *evsel = iter->evsel;
if (perf_hpp_list.sym && single)
perf_top__record_precise_ip(top, he, iter->sample, evsel, al->addr);
hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
!(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
return 0;
}
static void perf_event__process_sample(struct perf_tool *tool,
const union perf_event *event,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_top *top = container_of(tool, struct perf_top, tool);
struct addr_location al;
int err;
if (!machine && perf_guest) {
static struct intlist *seen;
if (!seen)
seen = intlist__new(NULL);
if (!intlist__has_entry(seen, sample->pid)) {
pr_err("Can't find guest [%d]'s kernel information\n",
sample->pid);
intlist__add(seen, sample->pid);
}
return;
}
if (!machine) {
pr_err("%u unprocessable samples recorded.\r",
top->session->evlist->stats.nr_unprocessable_samples++);
return;
}
if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
top->exact_samples++;
if (machine__resolve(machine, &al, sample) < 0)
return;
if (!machine->kptr_restrict_warned &&
symbol_conf.kptr_restrict &&
al.cpumode == PERF_RECORD_MISC_KERNEL) {
if (!perf_evlist__exclude_kernel(top->session->evlist)) {
ui__warning(
"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
"Kernel%s samples will not be resolved.\n",
al.map && map__has_symbols(al.map) ?
" modules" : "");
if (use_browser <= 0)
sleep(5);
}
machine->kptr_restrict_warned = true;
}
if (al.sym == NULL && al.map != NULL) {
const char *msg = "Kernel samples will not be resolved.\n";
/*
* As we do lazy loading of symtabs we only will know if the
* specified vmlinux file is invalid when we actually have a
* hit in kernel space and then try to load it. So if we get
* here and there are _no_ symbols in the DSO backing the
* kernel map, bail out.
*
* We may never get here, for instance, if we use -K/
* --hide-kernel-symbols, even if the user specifies an
* invalid --vmlinux ;-)
*/
if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
__map__is_kernel(al.map) && map__has_symbols(al.map)) {
if (symbol_conf.vmlinux_name) {
char serr[256];
dso__strerror_load(al.map->dso, serr, sizeof(serr));
ui__warning("The %s file can't be used: %s\n%s",
symbol_conf.vmlinux_name, serr, msg);
} else {
ui__warning("A vmlinux file was not found.\n%s",
msg);
}
if (use_browser <= 0)
sleep(5);
top->vmlinux_warned = true;
}
}
if (al.sym == NULL || !al.sym->idle) {
struct hists *hists = evsel__hists(evsel);
struct hist_entry_iter iter = {
.evsel = evsel,
.sample = sample,
.add_entry_cb = hist_iter__top_callback,
};
if (symbol_conf.cumulate_callchain)
iter.ops = &hist_iter_cumulative;
else
iter.ops = &hist_iter_normal;
pthread_mutex_lock(&hists->lock);
err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
if (err < 0)
pr_err("Problem incrementing symbol period, skipping event\n");
pthread_mutex_unlock(&hists->lock);
}
addr_location__put(&al);
}
static void
perf_top__process_lost(struct perf_top *top, union perf_event *event,
struct evsel *evsel)
{
struct hists *hists = evsel__hists(evsel);
top->lost += event->lost.lost;
top->lost_total += event->lost.lost;
hists->stats.total_lost += event->lost.lost;
}
static void
perf_top__process_lost_samples(struct perf_top *top,
union perf_event *event,
struct evsel *evsel)
{
struct hists *hists = evsel__hists(evsel);
top->lost += event->lost_samples.lost;
top->lost_total += event->lost_samples.lost;
hists->stats.total_lost_samples += event->lost_samples.lost;
}
static u64 last_timestamp;
static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
{
struct record_opts *opts = &top->record_opts;
struct evlist *evlist = top->evlist;
struct mmap *md;
union perf_event *event;
md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
if (perf_mmap__read_init(md) < 0)
return;
while ((event = perf_mmap__read_event(md)) != NULL) {
int ret;
ret = perf_evlist__parse_sample_timestamp(evlist, event, &last_timestamp);
if (ret && ret != -1)
break;
ret = ordered_events__queue(top->qe.in, event, last_timestamp, 0);
if (ret)
break;
perf_mmap__consume(md);
if (top->qe.rotate) {
pthread_mutex_lock(&top->qe.mutex);
top->qe.rotate = false;
pthread_cond_signal(&top->qe.cond);
pthread_mutex_unlock(&top->qe.mutex);
}
}
perf_mmap__read_done(md);
}
static void perf_top__mmap_read(struct perf_top *top)
{
bool overwrite = top->record_opts.overwrite;
struct evlist *evlist = top->evlist;
int i;
if (overwrite)
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
for (i = 0; i < top->evlist->core.nr_mmaps; i++)
perf_top__mmap_read_idx(top, i);
if (overwrite) {
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
}
}
/*
* Check per-event overwrite term.
* perf top should support consistent term for all events.
* - All events don't have per-event term
* E.g. "cpu/cpu-cycles/,cpu/instructions/"
* Nothing change, return 0.
* - All events have same per-event term
* E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
* Using the per-event setting to replace the opts->overwrite if
* they are different, then return 0.
* - Events have different per-event term
* E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
* Return -1
* - Some of the event set per-event term, but some not.
* E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
* Return -1
*/
static int perf_top__overwrite_check(struct perf_top *top)
{
struct record_opts *opts = &top->record_opts;
struct evlist *evlist = top->evlist;
struct perf_evsel_config_term *term;
struct list_head *config_terms;
struct evsel *evsel;
int set, overwrite = -1;
evlist__for_each_entry(evlist, evsel) {
set = -1;
config_terms = &evsel->config_terms;
list_for_each_entry(term, config_terms, list) {
if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
set = term->val.overwrite ? 1 : 0;
}
/* no term for current and previous event (likely) */
if ((overwrite < 0) && (set < 0))
continue;
/* has term for both current and previous event, compare */
if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
return -1;
/* no term for current event but has term for previous one */
if ((overwrite >= 0) && (set < 0))
return -1;
/* has term for current event */
if ((overwrite < 0) && (set >= 0)) {
/* if it's first event, set overwrite */
if (evsel == evlist__first(evlist))
overwrite = set;
else
return -1;
}
}
if ((overwrite >= 0) && (opts->overwrite != overwrite))
opts->overwrite = overwrite;
return 0;
}
static int perf_top_overwrite_fallback(struct perf_top *top,
struct evsel *evsel)
{
struct record_opts *opts = &top->record_opts;
struct evlist *evlist = top->evlist;
struct evsel *counter;
if (!opts->overwrite)
return 0;
/* only fall back when first event fails */
if (evsel != evlist__first(evlist))
return 0;
evlist__for_each_entry(evlist, counter)
counter->core.attr.write_backward = false;
opts->overwrite = false;
pr_debug2("fall back to non-overwrite mode\n");
return 1;
}
static int perf_top__start_counters(struct perf_top *top)
{
char msg[BUFSIZ];
struct evsel *counter;
struct evlist *evlist = top->evlist;
struct record_opts *opts = &top->record_opts;
if (perf_top__overwrite_check(top)) {
ui__error("perf top only support consistent per-event "
"overwrite setting for all events\n");
goto out_err;
}
perf_evlist__config(evlist, opts, &callchain_param);
evlist__for_each_entry(evlist, counter) {
try_again:
if (evsel__open(counter, top->evlist->core.cpus,
top->evlist->core.threads) < 0) {
/*
* Specially handle overwrite fall back.
* Because perf top is the only tool which has
* overwrite mode by default, support
* both overwrite and non-overwrite mode, and
* require consistent mode for all events.
*
* May move it to generic code with more tools
* have similar attribute.
*/
if (perf_missing_features.write_backward &&
perf_top_overwrite_fallback(top, counter))
goto try_again;
if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
if (verbose > 0)
ui__warning("%s\n", msg);
goto try_again;
}
perf_evsel__open_strerror(counter, &opts->target,
errno, msg, sizeof(msg));
ui__error("%s\n", msg);
goto out_err;
}
}
if (evlist__mmap(evlist, opts->mmap_pages) < 0) {
ui__error("Failed to mmap with %d (%s)\n",
errno, str_error_r(errno, msg, sizeof(msg)));
goto out_err;
}
return 0;
out_err:
return -1;
}
static int callchain_param__setup_sample_type(struct callchain_param *callchain)
{
if (callchain->mode != CHAIN_NONE) {
if (callchain_register_param(callchain) < 0) {
ui__error("Can't register callchain params.\n");
return -EINVAL;
}
}
return 0;
}
static struct ordered_events *rotate_queues(struct perf_top *top)
{
struct ordered_events *in = top->qe.in;
if (top->qe.in == &top->qe.data[1])
top->qe.in = &top->qe.data[0];
else
top->qe.in = &top->qe.data[1];
return in;
}
static void *process_thread(void *arg)
{
struct perf_top *top = arg;
while (!done) {
struct ordered_events *out, *in = top->qe.in;
if (!in->nr_events) {
usleep(100);
continue;
}
out = rotate_queues(top);
pthread_mutex_lock(&top->qe.mutex);
top->qe.rotate = true;
pthread_cond_wait(&top->qe.cond, &top->qe.mutex);
pthread_mutex_unlock(&top->qe.mutex);
if (ordered_events__flush(out, OE_FLUSH__TOP))
pr_err("failed to process events\n");
}
return NULL;
}
/*
* Allow only 'top->delay_secs' seconds behind samples.
*/
static int should_drop(struct ordered_event *qevent, struct perf_top *top)
{
union perf_event *event = qevent->event;
u64 delay_timestamp;
if (event->header.type != PERF_RECORD_SAMPLE)
return false;
delay_timestamp = qevent->timestamp + top->delay_secs * NSEC_PER_SEC;
return delay_timestamp < last_timestamp;
}
static int deliver_event(struct ordered_events *qe,
struct ordered_event *qevent)
{
struct perf_top *top = qe->data;
struct evlist *evlist = top->evlist;
struct perf_session *session = top->session;
union perf_event *event = qevent->event;
struct perf_sample sample;
struct evsel *evsel;
struct machine *machine;
int ret = -1;
if (should_drop(qevent, top)) {
top->drop++;
top->drop_total++;
return 0;
}
ret = perf_evlist__parse_sample(evlist, event, &sample);
if (ret) {
pr_err("Can't parse sample, err = %d\n", ret);
goto next_event;
}
evsel = perf_evlist__id2evsel(session->evlist, sample.id);
assert(evsel != NULL);
if (event->header.type == PERF_RECORD_SAMPLE) {
if (evswitch__discard(&top->evswitch, evsel))
return 0;
++top->samples;
}
switch (sample.cpumode) {
case PERF_RECORD_MISC_USER:
++top->us_samples;
if (top->hide_user_symbols)
goto next_event;
machine = &session->machines.host;
break;
case PERF_RECORD_MISC_KERNEL:
++top->kernel_samples;
if (top->hide_kernel_symbols)
goto next_event;
machine = &session->machines.host;
break;
case PERF_RECORD_MISC_GUEST_KERNEL:
++top->guest_kernel_samples;
machine = perf_session__find_machine(session,
sample.pid);
break;
case PERF_RECORD_MISC_GUEST_USER:
++top->guest_us_samples;
/*
* TODO: we don't process guest user from host side
* except simple counting.
*/
goto next_event;
default:
if (event->header.type == PERF_RECORD_SAMPLE)
goto next_event;
machine = &session->machines.host;
break;
}
if (event->header.type == PERF_RECORD_SAMPLE) {
perf_event__process_sample(&top->tool, event, evsel,
&sample, machine);
} else if (event->header.type == PERF_RECORD_LOST) {
perf_top__process_lost(top, event, evsel);
} else if (event->header.type == PERF_RECORD_LOST_SAMPLES) {
perf_top__process_lost_samples(top, event, evsel);
} else if (event->header.type < PERF_RECORD_MAX) {
hists__inc_nr_events(evsel__hists(evsel), event->header.type);
machine__process_event(machine, event, &sample);
} else
++session->evlist->stats.nr_unknown_events;
ret = 0;
next_event:
return ret;
}
static void init_process_thread(struct perf_top *top)
{
ordered_events__init(&top->qe.data[0], deliver_event, top);
ordered_events__init(&top->qe.data[1], deliver_event, top);
ordered_events__set_copy_on_queue(&top->qe.data[0], true);
ordered_events__set_copy_on_queue(&top->qe.data[1], true);
top->qe.in = &top->qe.data[0];
pthread_mutex_init(&top->qe.mutex, NULL);
pthread_cond_init(&top->qe.cond, NULL);
}
static int __cmd_top(struct perf_top *top)
{
struct record_opts *opts = &top->record_opts;
pthread_t thread, thread_process;
int ret;
if (!top->annotation_opts.objdump_path) {
ret = perf_env__lookup_objdump(&top->session->header.env,
&top->annotation_opts.objdump_path);
if (ret)
return ret;
}
ret = callchain_param__setup_sample_type(&callchain_param);
if (ret)
return ret;
if (perf_session__register_idle_thread(top->session) < 0)
return ret;
if (top->nr_threads_synthesize > 1)
perf_set_multithreaded();
init_process_thread(top);
if (opts->record_namespaces)
top->tool.namespace_events = true;
ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
&top->session->machines.host,
&top->record_opts);
if (ret < 0)
pr_debug("Couldn't synthesize BPF events: Pre-existing BPF programs won't have symbols resolved.\n");
machine__synthesize_threads(&top->session->machines.host, &opts->target,
top->evlist->core.threads, false,
top->nr_threads_synthesize);
if (top->nr_threads_synthesize > 1)
perf_set_singlethreaded();
if (perf_hpp_list.socket) {
ret = perf_env__read_cpu_topology_map(&perf_env);
if (ret < 0) {
char errbuf[BUFSIZ];
const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
ui__error("Could not read the CPU topology map: %s\n", err);
return ret;
}
}
ret = perf_top__start_counters(top);
if (ret)
return ret;
top->session->evlist = top->evlist;
perf_session__set_id_hdr_size(top->session);
/*
* When perf is starting the traced process, all the events (apart from
* group members) have enable_on_exec=1 set, so don't spoil it by
* prematurely enabling them.
*
* XXX 'top' still doesn't start workloads like record, trace, but should,
* so leave the check here.
*/
if (!target__none(&opts->target))
evlist__enable(top->evlist);
ret = -1;
if (pthread_create(&thread_process, NULL, process_thread, top)) {
ui__error("Could not create process thread.\n");
return ret;
}
if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
display_thread), top)) {
ui__error("Could not create display thread.\n");
goto out_join_thread;
}
if (top->realtime_prio) {
struct sched_param param;
param.sched_priority = top->realtime_prio;
if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
ui__error("Could not set realtime priority.\n");
goto out_join;
}
}
/* Wait for a minimal set of events before starting the snapshot */
evlist__poll(top->evlist, 100);
perf_top__mmap_read(top);
while (!done) {
u64 hits = top->samples;
perf_top__mmap_read(top);
if (opts->overwrite || (hits == top->samples))
ret = evlist__poll(top->evlist, 100);
if (resize) {
perf_top__resize(top);
resize = 0;
}
}
ret = 0;
out_join:
pthread_join(thread, NULL);
out_join_thread:
pthread_cond_signal(&top->qe.cond);
pthread_join(thread_process, NULL);
return ret;
}
static int
callchain_opt(const struct option *opt, const char *arg, int unset)
{
symbol_conf.use_callchain = true;
return record_callchain_opt(opt, arg, unset);
}
static int
parse_callchain_opt(const struct option *opt, const char *arg, int unset)
{
struct callchain_param *callchain = opt->value;
callchain->enabled = !unset;
callchain->record_mode = CALLCHAIN_FP;
/*
* --no-call-graph
*/
if (unset) {
symbol_conf.use_callchain = false;
callchain->record_mode = CALLCHAIN_NONE;
return 0;
}
return parse_callchain_top_opt(arg);
}
static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
{
if (!strcmp(var, "top.call-graph")) {
var = "call-graph.record-mode";
return perf_default_config(var, value, cb);
}
if (!strcmp(var, "top.children")) {
symbol_conf.cumulate_callchain = perf_config_bool(var, value);
return 0;
}
return 0;
}
static int
parse_percent_limit(const struct option *opt, const char *arg,
int unset __maybe_unused)
{
struct perf_top *top = opt->value;
top->min_percent = strtof(arg, NULL);
return 0;
}
const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
"\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
int cmd_top(int argc, const char **argv)
{
char errbuf[BUFSIZ];
struct perf_top top = {
.count_filter = 5,
.delay_secs = 2,
.record_opts = {
.mmap_pages = UINT_MAX,
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
.freq = 4000, /* 4 KHz */
.target = {
.uses_mmap = true,
},
/*
* FIXME: This will lose PERF_RECORD_MMAP and other metadata
* when we pause, fix that and reenable. Probably using a
* separate evlist with a dummy event, i.e. a non-overwrite
* ring buffer just for metadata events, while PERF_RECORD_SAMPLE
* stays in overwrite mode. -acme
* */
.overwrite = 0,
.sample_time = true,
.sample_time_set = true,
},
.max_stack = sysctl__max_stack(),
.annotation_opts = annotation__default_options,
.nr_threads_synthesize = UINT_MAX,
};
struct record_opts *opts = &top.record_opts;
struct target *target = &opts->target;
const struct option options[] = {
OPT_CALLBACK('e', "event", &top.evlist, "event",
"event selector. use 'perf list' to list available events",
parse_events_option),
OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
OPT_STRING('p', "pid", &target->pid, "pid",
"profile events on existing process id"),
OPT_STRING('t', "tid", &target->tid, "tid",
"profile events on existing thread id"),
OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
"system-wide collection from all CPUs"),
OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
"list of cpus to monitor"),
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
"don't load vmlinux even if found"),
OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
"file", "kallsyms pathname"),
OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
"hide kernel symbols"),
OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
"number of mmap data pages",
perf_evlist__parse_mmap_pages),
OPT_INTEGER('r', "realtime", &top.realtime_prio,
"collect data with this RT SCHED_FIFO priority"),
OPT_INTEGER('d', "delay", &top.delay_secs,
"number of seconds to delay between refreshes"),
OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
"dump the symbol table used for profiling"),
OPT_INTEGER('f', "count-filter", &top.count_filter,
"only display functions with more events than this"),
OPT_BOOLEAN(0, "group", &opts->group,
"put the counters into a counter group"),
OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
"child tasks do not inherit counters"),
OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
"symbol to annotate"),
OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
"profile at this frequency",
record__parse_freq),
OPT_INTEGER('E', "entries", &top.print_entries,
"display this many functions"),
OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
"hide user symbols"),
OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
"sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
" Please refer the man page for the complete list."),
OPT_STRING(0, "fields", &field_order, "key[,keys...]",
"output field(s): overhead, period, sample plus all of sort keys"),
OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
"Show a column with the number of samples"),
OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
NULL, "enables call-graph recording and display",
&callchain_opt),
OPT_CALLBACK(0, "call-graph", &callchain_param,
"record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
top_callchain_help, &parse_callchain_opt),
OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
"Accumulate callchains of children and show total overhead as well"),
OPT_INTEGER(0, "max-stack", &top.max_stack,
"Set the maximum stack depth when parsing the callchain. "
"Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
"ignore callees of these functions in call graphs",
report_parse_ignore_callees_opt),
OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
"Show a column with the sum of periods"),
OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
"only consider symbols in these dsos"),
OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
"only consider symbols in these comms"),
OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
"only consider these symbols"),
OPT_BOOLEAN(0, "source", &top.annotation_opts.annotate_src,
"Interleave source code with assembly code (default)"),
OPT_BOOLEAN(0, "asm-raw", &top.annotation_opts.show_asm_raw,
"Display raw encoding of assembly instructions (default)"),
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
"Enable kernel symbol demangling"),
OPT_BOOLEAN(0, "no-bpf-event", &top.record_opts.no_bpf_event, "do not record bpf events"),
OPT_STRING(0, "objdump", &top.annotation_opts.objdump_path, "path",
"objdump binary to use for disassembly and annotations"),
OPT_STRING('M', "disassembler-style", &top.annotation_opts.disassembler_style, "disassembler style",
"Specify disassembler style (e.g. -M intel for intel syntax)"),
OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
OPT_CALLBACK(0, "percent-limit", &top, "percent",
"Don't show entries under that percent", parse_percent_limit),
OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
"How to display percentage of filtered entries", parse_filter_percentage),
OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
"width[,width...]",
"don't try to adjust column width, use these fixed values"),
OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
"branch any", "sample any taken branches",
parse_branch_stack),
OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
"branch filter mask", "branch stack filter modes",
parse_branch_stack),
OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
"Show raw trace event output (do not use print fmt or plugins)"),
OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
"Show entries in a hierarchy"),
OPT_BOOLEAN(0, "overwrite", &top.record_opts.overwrite,
"Use a backward ring buffer, default: no"),
OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
"number of thread to run event synthesize"),
OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces,
"Record namespaces events"),
OPTS_EVSWITCH(&top.evswitch),
OPT_END()
};
struct evlist *sb_evlist = NULL;
const char * const top_usage[] = {
"perf top [<options>]",
NULL
};
int status = hists__init();
if (status < 0)
return status;
top.annotation_opts.min_pcnt = 5;
top.annotation_opts.context = 4;
top.evlist = evlist__new();
if (top.evlist == NULL)
return -ENOMEM;
status = perf_config(perf_top_config, &top);
if (status)
return status;
argc = parse_options(argc, argv, options, top_usage, 0);
if (argc)
usage_with_options(top_usage, options);
if (!top.evlist->core.nr_entries &&
perf_evlist__add_default(top.evlist) < 0) {
pr_err("Not enough memory for event selector list\n");
goto out_delete_evlist;
}
status = evswitch__init(&top.evswitch, top.evlist, stderr);
if (status)
goto out_delete_evlist;
if (symbol_conf.report_hierarchy) {
/* disable incompatible options */
symbol_conf.event_group = false;
symbol_conf.cumulate_callchain = false;
if (field_order) {
pr_err("Error: --hierarchy and --fields options cannot be used together\n");
parse_options_usage(top_usage, options, "fields", 0);
parse_options_usage(NULL, options, "hierarchy", 0);
goto out_delete_evlist;
}
}
if (opts->branch_stack && callchain_param.enabled)
symbol_conf.show_branchflag_count = true;
sort__mode = SORT_MODE__TOP;
/* display thread wants entries to be collapsed in a different tree */
perf_hpp_list.need_collapse = 1;
if (top.use_stdio)
use_browser = 0;
else if (top.use_tui)
use_browser = 1;
setup_browser(false);
if (setup_sorting(top.evlist) < 0) {
if (sort_order)
parse_options_usage(top_usage, options, "s", 1);
if (field_order)
parse_options_usage(sort_order ? NULL : top_usage,
options, "fields", 0);
goto out_delete_evlist;
}
status = target__validate(target);
if (status) {
target__strerror(target, status, errbuf, BUFSIZ);
ui__warning("%s\n", errbuf);
}
status = target__parse_uid(target);
if (status) {
int saved_errno = errno;
target__strerror(target, status, errbuf, BUFSIZ);
ui__error("%s\n", errbuf);
status = -saved_errno;
goto out_delete_evlist;
}
if (target__none(target))
target->system_wide = true;
if (perf_evlist__create_maps(top.evlist, target) < 0) {
ui__error("Couldn't create thread/CPU maps: %s\n",
errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
goto out_delete_evlist;
}
if (top.delay_secs < 1)
top.delay_secs = 1;
if (record_opts__config(opts)) {
status = -EINVAL;
goto out_delete_evlist;
}
top.sym_evsel = evlist__first(top.evlist);
if (!callchain_param.enabled) {
symbol_conf.cumulate_callchain = false;
perf_hpp__cancel_cumulate();
}
if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
callchain_param.order = ORDER_CALLER;
status = symbol__annotation_init();
if (status < 0)
goto out_delete_evlist;
annotation_config__init();
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
status = symbol__init(NULL);
if (status < 0)
goto out_delete_evlist;
sort__setup_elide(stdout);
get_term_dimensions(&top.winsize);
if (top.print_entries == 0) {
perf_top__update_print_entries(&top);
signal(SIGWINCH, winch_sig);
}
top.session = perf_session__new(NULL, false, NULL);
if (IS_ERR(top.session)) {
status = PTR_ERR(top.session);
goto out_delete_evlist;
}
if (!top.record_opts.no_bpf_event)
bpf_event__add_sb_event(&sb_evlist, &perf_env);
if (perf_evlist__start_sb_thread(sb_evlist, target)) {
pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
opts->no_bpf_event = true;
}
status = __cmd_top(&top);
if (!opts->no_bpf_event)
perf_evlist__stop_sb_thread(sb_evlist);
out_delete_evlist:
evlist__delete(top.evlist);
perf_session__delete(top.session);
return status;
}