/*
* 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>
*
* Released under the GPL v2. (and only v2, not any later version)
*/
#include "builtin.h"
#include "perf.h"
#include "util/annotate.h"
#include "util/cache.h"
#include "util/color.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/machine.h"
#include "util/session.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/thread_map.h"
#include "util/top.h"
#include "util/util.h"
#include <linux/rbtree.h>
#include "util/parse-options.h"
#include "util/parse-events.h"
#include "util/cpumap.h"
#include "util/xyarray.h"
#include "util/sort.h"
#include "util/intlist.h"
#include "util/debug.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 <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <linux/unistd.h>
#include <linux/types.h>
static volatile int done;
static void perf_top__update_print_entries(struct perf_top *top)
{
if (top->print_entries > 9)
top->print_entries -= 9;
}
static void perf_top__sig_winch(int sig __maybe_unused,
siginfo_t *info __maybe_unused, void *arg)
{
struct perf_top *top = arg;
get_term_dimensions(&top->winsize);
if (!top->print_entries
|| (top->print_entries+4) > top->winsize.ws_row) {
top->print_entries = top->winsize.ws_row;
} else {
top->print_entries += 4;
top->winsize.ws_row = top->print_entries;
}
perf_top__update_print_entries(top);
}
static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
{
struct symbol *sym;
struct annotation *notes;
struct map *map;
int err = -1;
if (!he || !he->ms.sym)
return -1;
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) {
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);
if (notes->src != NULL) {
pthread_mutex_lock(¬es->lock);
goto out_assign;
}
pthread_mutex_lock(¬es->lock);
if (symbol__alloc_hist(sym) < 0) {
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, 0);
if (err == 0) {
out_assign:
top->sym_filter_entry = he;
}
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,
int counter, u64 ip)
{
struct annotation *notes;
struct symbol *sym;
int err;
if (he == NULL || he->ms.sym == NULL ||
((top->sym_filter_entry == NULL ||
top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
return;
sym = he->ms.sym;
notes = symbol__annotation(sym);
if (pthread_mutex_trylock(¬es->lock))
return;
if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
pthread_mutex_unlock(¬es->lock);
pr_err("Not enough memory for annotating '%s' symbol!\n",
sym->name);
sleep(1);
return;
}
ip = he->ms.map->map_ip(he->ms.map, ip);
err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
pthread_mutex_unlock(¬es->lock);
if (err == -ERANGE && !he->ms.map->erange_warned)
ui__warn_map_erange(he->ms.map, sym, ip);
}
static void perf_top__show_details(struct perf_top *top)
{
struct hist_entry *he = top->sym_filter_entry;
struct annotation *notes;
struct symbol *symbol;
int more;
if (!he)
return;
symbol = he->ms.sym;
notes = symbol__annotation(symbol);
pthread_mutex_lock(¬es->lock);
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->sym_pcnt_filter);
more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
0, top->sym_pcnt_filter, top->print_entries, 4);
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 const char CONSOLE_CLEAR[] = "[H[2J";
static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
struct addr_location *al,
struct perf_sample *sample)
{
struct hist_entry *he;
he = __hists__add_entry(&evsel->hists, al, NULL, sample->period,
sample->weight);
if (he == NULL)
return NULL;
hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
return he;
}
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;
puts(CONSOLE_CLEAR);
perf_top__header_snprintf(top, bf, sizeof(bf));
printf("%s\n", bf);
perf_top__reset_sample_counters(top);
printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
if (top->sym_evsel->hists.stats.nr_lost_warned !=
top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
top->sym_evsel->hists.stats.nr_lost_warned =
top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
color_fprintf(stdout, PERF_COLOR_RED,
"WARNING: LOST %d chunks, Check IO/CPU overload",
top->sym_evsel->hists.stats.nr_lost_warned);
++printed;
}
if (top->sym_filter_entry) {
perf_top__show_details(top);
return;
}
hists__collapse_resort_threaded(&top->sym_evsel->hists);
hists__output_resort_threaded(&top->sym_evsel->hists);
hists__decay_entries_threaded(&top->sym_evsel->hists,
top->hide_user_symbols,
top->hide_kernel_symbols);
hists__output_recalc_col_len(&top->sym_evsel->hists,
top->winsize.ws_row - 3);
putchar('\n');
hists__fprintf(&top->sym_evsel->hists, false,
top->winsize.ws_row - 4 - printed, win_width, stdout);
}
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 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(&top->sym_evsel->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->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->sym_pcnt_filter);
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 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->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 tc, save;
perf_top__print_mapped_keys(top);
fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
fflush(stdout);
tcgetattr(0, &save);
tc = save;
tc.c_lflag &= ~(ICANON | ECHO);
tc.c_cc[VMIN] = 0;
tc.c_cc[VTIME] = 0;
tcsetattr(0, TCSANOW, &tc);
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) {
struct sigaction act = {
.sa_sigaction = perf_top__sig_winch,
.sa_flags = SA_SIGINFO,
};
perf_top__sig_winch(SIGWINCH, NULL, top);
sigaction(SIGWINCH, &act, NULL);
} else {
perf_top__sig_winch(SIGWINCH, NULL, top);
signal(SIGWINCH, SIG_DFL);
}
break;
case 'E':
if (top->evlist->nr_entries > 1) {
/* Select 0 as the default event: */
int counter = 0;
fprintf(stderr, "\nAvailable events:");
list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
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->nr_entries) {
top->sym_evsel = perf_evlist__first(top->evlist);
fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
sleep(1);
break;
}
list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
if (top->sym_evsel->idx == counter)
break;
} else
top->sym_evsel = perf_evlist__first(top->evlist);
break;
case 'f':
prompt_integer(&top->count_filter, "Enter display event count filter");
break;
case 'F':
prompt_percent(&top->sym_pcnt_filter,
"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;
perf_top__reset_sample_counters(t);
if (t->evlist->selected != NULL)
t->sym_evsel = t->evlist->selected;
hists__collapse_resort_threaded(&t->sym_evsel->hists);
hists__output_resort_threaded(&t->sym_evsel->hists);
hists__decay_entries_threaded(&t->sym_evsel->hists,
t->hide_user_symbols,
t->hide_kernel_symbols);
}
static void *display_thread_tui(void *arg)
{
struct perf_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,
};
perf_top__sort_new_samples(top);
/*
* Initialize the uid_filter_str, in the future the TUI will allow
* Zooming in/out UIDs. For now juse use whatever the user passed
* via --uid.
*/
list_for_each_entry(pos, &top->evlist->entries, node)
pos->hists.uid_filter_str = top->record_opts.target.uid_str;
perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
&top->session->header.env);
done = 1;
return NULL;
}
static void *display_thread(void *arg)
{
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
struct termios tc, save;
struct perf_top *top = arg;
int delay_msecs, c;
tcgetattr(0, &save);
tc = save;
tc.c_lflag &= ~(ICANON | ECHO);
tc.c_cc[VMIN] = 0;
tc.c_cc[VTIME] = 0;
pthread__unblock_sigwinch();
repeat:
delay_msecs = top->delay_secs * 1000;
tcsetattr(0, TCSANOW, &tc);
/* 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;
/* Fall trhu */
default:
c = getc(stdin);
tcsetattr(0, TCSAFLUSH, &save);
if (perf_top__handle_keypress(top, c))
goto repeat;
done = 1;
}
}
return NULL;
}
/* Tag samples to be skipped. */
static const char *skip_symbols[] = {
"intel_idle",
"default_idle",
"native_safe_halt",
"cpu_idle",
"enter_idle",
"exit_idle",
"mwait_idle",
"mwait_idle_with_hints",
"poll_idle",
"ppc64_runlatch_off",
"pseries_dedicated_idle_sleep",
NULL
};
static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
{
const char *name = sym->name;
int i;
/*
* ppc64 uses function descriptors and appends a '.' to the
* start of every instruction address. Remove it.
*/
if (name[0] == '.')
name++;
if (!strcmp(name, "_text") ||
!strcmp(name, "_etext") ||
!strcmp(name, "_sinittext") ||
!strncmp("init_module", name, 11) ||
!strncmp("cleanup_module", name, 14) ||
strstr(name, "_text_start") ||
strstr(name, "_text_end"))
return 1;
for (i = 0; skip_symbols[i]; i++) {
if (!strcmp(skip_symbols[i], name)) {
sym->ignore = true;
break;
}
}
return 0;
}
static void perf_event__process_sample(struct perf_tool *tool,
const union perf_event *event,
struct perf_evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_top *top = container_of(tool, struct perf_top, tool);
struct symbol *parent = NULL;
u64 ip = event->ip.ip;
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, event->ip.pid)) {
pr_err("Can't find guest [%d]'s kernel information\n",
event->ip.pid);
intlist__add(seen, event->ip.pid);
}
return;
}
if (!machine) {
pr_err("%u unprocessable samples recorded.\r",
top->session->stats.nr_unprocessable_samples++);
return;
}
if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
top->exact_samples++;
if (perf_event__preprocess_sample(event, machine, &al, sample,
symbol_filter) < 0 ||
al.filtered)
return;
if (!top->kptr_restrict_warned &&
symbol_conf.kptr_restrict &&
al.cpumode == PERF_RECORD_MISC_KERNEL) {
ui__warning(
"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n"
"Kernel%s samples will not be resolved.\n",
!RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
" modules" : "");
if (use_browser <= 0)
sleep(5);
top->kptr_restrict_warned = true;
}
if (al.sym == 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 (!top->kptr_restrict_warned && !top->vmlinux_warned &&
al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
if (symbol_conf.vmlinux_name) {
ui__warning("The %s file can't be used.\n%s",
symbol_conf.vmlinux_name, 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->ignore) {
struct hist_entry *he;
if ((sort__has_parent || symbol_conf.use_callchain) &&
sample->callchain) {
err = machine__resolve_callchain(machine, evsel,
al.thread, sample,
&parent);
if (err)
return;
}
he = perf_evsel__add_hist_entry(evsel, &al, sample);
if (he == NULL) {
pr_err("Problem incrementing symbol period, skipping event\n");
return;
}
if (symbol_conf.use_callchain) {
err = callchain_append(he->callchain, &callchain_cursor,
sample->period);
if (err)
return;
}
if (top->sort_has_symbols)
perf_top__record_precise_ip(top, he, evsel->idx, ip);
}
return;
}
static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
{
struct perf_sample sample;
struct perf_evsel *evsel;
struct perf_session *session = top->session;
union perf_event *event;
struct machine *machine;
u8 origin;
int ret;
while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
ret = perf_evlist__parse_sample(top->evlist, event, &sample);
if (ret) {
pr_err("Can't parse sample, err = %d\n", ret);
continue;
}
evsel = perf_evlist__id2evsel(session->evlist, sample.id);
assert(evsel != NULL);
origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
if (event->header.type == PERF_RECORD_SAMPLE)
++top->samples;
switch (origin) {
case PERF_RECORD_MISC_USER:
++top->us_samples;
if (top->hide_user_symbols)
continue;
machine = &session->machines.host;
break;
case PERF_RECORD_MISC_KERNEL:
++top->kernel_samples;
if (top->hide_kernel_symbols)
continue;
machine = &session->machines.host;
break;
case PERF_RECORD_MISC_GUEST_KERNEL:
++top->guest_kernel_samples;
machine = perf_session__find_machine(session, event->ip.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.
*/
/* Fall thru */
default:
continue;
}
if (event->header.type == PERF_RECORD_SAMPLE) {
perf_event__process_sample(&top->tool, event, evsel,
&sample, machine);
} else if (event->header.type < PERF_RECORD_MAX) {
hists__inc_nr_events(&evsel->hists, event->header.type);
machine__process_event(machine, event);
} else
++session->stats.nr_unknown_events;
}
}
static void perf_top__mmap_read(struct perf_top *top)
{
int i;
for (i = 0; i < top->evlist->nr_mmaps; i++)
perf_top__mmap_read_idx(top, i);
}
static int perf_top__start_counters(struct perf_top *top)
{
char msg[512];
struct perf_evsel *counter;
struct perf_evlist *evlist = top->evlist;
struct perf_record_opts *opts = &top->record_opts;
perf_evlist__config(evlist, opts);
list_for_each_entry(counter, &evlist->entries, node) {
try_again:
if (perf_evsel__open(counter, top->evlist->cpus,
top->evlist->threads) < 0) {
if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
if (verbose)
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 (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
ui__error("Failed to mmap with %d (%s)\n",
errno, strerror(errno));
goto out_err;
}
return 0;
out_err:
return -1;
}
static int perf_top__setup_sample_type(struct perf_top *top)
{
if (!top->sort_has_symbols) {
if (symbol_conf.use_callchain) {
ui__error("Selected -g but \"sym\" not present in --sort/-s.");
return -EINVAL;
}
} else if (callchain_param.mode != CHAIN_NONE) {
if (callchain_register_param(&callchain_param) < 0) {
ui__error("Can't register callchain params.\n");
return -EINVAL;
}
}
return 0;
}
static int __cmd_top(struct perf_top *top)
{
struct perf_record_opts *opts = &top->record_opts;
pthread_t thread;
int ret;
/*
* FIXME: perf_session__new should allow passing a O_MMAP, so that all this
* mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
*/
top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
if (top->session == NULL)
return -ENOMEM;
ret = perf_top__setup_sample_type(top);
if (ret)
goto out_delete;
if (perf_target__has_task(&opts->target))
perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
perf_event__process,
&top->session->machines.host);
else
perf_event__synthesize_threads(&top->tool, perf_event__process,
&top->session->machines.host);
ret = perf_top__start_counters(top);
if (ret)
goto out_delete;
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 (!perf_target__none(&opts->target))
perf_evlist__enable(top->evlist);
/* Wait for a minimal set of events before starting the snapshot */
poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
perf_top__mmap_read(top);
ret = -1;
if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
display_thread), top)) {
ui__error("Could not create display thread.\n");
goto out_delete;
}
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_delete;
}
}
while (!done) {
u64 hits = top->samples;
perf_top__mmap_read(top);
if (hits == top->samples)
ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
}
ret = 0;
out_delete:
perf_session__delete(top->session);
top->session = NULL;
return ret;
}
static int
parse_callchain_opt(const struct option *opt, const char *arg, int unset)
{
/*
* --no-call-graph
*/
if (unset)
return 0;
symbol_conf.use_callchain = true;
return record_parse_callchain_opt(opt, arg, unset);
}
int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
{
int status;
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,
},
},
.sym_pcnt_filter = 5,
};
struct perf_record_opts *opts = &top.record_opts;
struct perf_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('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
"hide kernel symbols"),
OPT_UINTEGER('m', "mmap-pages", &opts->mmap_pages,
"number of mmap data 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('g', "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_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
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, weight, local_weight"),
OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
"Show a column with the number of samples"),
OPT_CALLBACK_DEFAULT('G', "call-graph", &top.record_opts,
"mode[,dump_size]", record_callchain_help,
&parse_callchain_opt, "fp"),
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", &symbol_conf.annotate_src,
"Interleave source code with assembly code (default)"),
OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
"Display raw encoding of assembly instructions (default)"),
OPT_STRING('M', "disassembler-style", &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_END()
};
const char * const top_usage[] = {
"perf top [<options>]",
NULL
};
top.evlist = perf_evlist__new();
if (top.evlist == NULL)
return -ENOMEM;
symbol_conf.exclude_other = false;
argc = parse_options(argc, argv, options, top_usage, 0);
if (argc)
usage_with_options(top_usage, options);
if (sort_order == default_sort_order)
sort_order = "dso,symbol";
if (setup_sorting() < 0)
usage_with_options(top_usage, options);
if (top.use_stdio)
use_browser = 0;
else if (top.use_tui)
use_browser = 1;
setup_browser(false);
status = perf_target__validate(target);
if (status) {
perf_target__strerror(target, status, errbuf, BUFSIZ);
ui__warning("%s", errbuf);
}
status = perf_target__parse_uid(target);
if (status) {
int saved_errno = errno;
perf_target__strerror(target, status, errbuf, BUFSIZ);
ui__error("%s", errbuf);
status = -saved_errno;
goto out_delete_evlist;
}
if (perf_target__none(target))
target->system_wide = true;
if (perf_evlist__create_maps(top.evlist, target) < 0)
usage_with_options(top_usage, options);
if (!top.evlist->nr_entries &&
perf_evlist__add_default(top.evlist) < 0) {
ui__error("Not enough memory for event selector list\n");
goto out_delete_maps;
}
symbol_conf.nr_events = top.evlist->nr_entries;
if (top.delay_secs < 1)
top.delay_secs = 1;
if (opts->user_interval != ULLONG_MAX)
opts->default_interval = opts->user_interval;
if (opts->user_freq != UINT_MAX)
opts->freq = opts->user_freq;
/*
* User specified count overrides default frequency.
*/
if (opts->default_interval)
opts->freq = 0;
else if (opts->freq) {
opts->default_interval = opts->freq;
} else {
ui__error("frequency and count are zero, aborting\n");
status = -EINVAL;
goto out_delete_maps;
}
top.sym_evsel = perf_evlist__first(top.evlist);
symbol_conf.priv_size = sizeof(struct annotation);
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
if (symbol__init() < 0)
return -1;
sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
/*
* Avoid annotation data structures overhead when symbols aren't on the
* sort list.
*/
top.sort_has_symbols = sort_sym.list.next != NULL;
get_term_dimensions(&top.winsize);
if (top.print_entries == 0) {
struct sigaction act = {
.sa_sigaction = perf_top__sig_winch,
.sa_flags = SA_SIGINFO,
};
perf_top__update_print_entries(&top);
sigaction(SIGWINCH, &act, NULL);
}
status = __cmd_top(&top);
out_delete_maps:
perf_evlist__delete_maps(top.evlist);
out_delete_evlist:
perf_evlist__delete(top.evlist);
return status;
}