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builtin-top.c
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/*
* 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 <[email protected]>
* 2011, Red Hat Inc, Arnaldo Carvalho de Melo <[email protected]>
*
* Improvements and fixes by:
*
* Arjan van de Ven <[email protected]>
* Yanmin Zhang <[email protected]>
* Wu Fengguang <[email protected]>
* Mike Galbraith <[email protected]>
* Paul Mackerras <[email protected]>
*
* Released under the GPL v2. (and only v2, not any later version)
*/
#include "builtin.h"
#include "perf.h"
#include "util/annotate.h"
#include "util/config.h"
#include "util/color.h"
#include "util/drv_configs.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/event.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 <linux/rbtree.h>
#include <subcmd/parse-options.h>
#include "util/parse-events.h"
#include "util/cpumap.h"
#include "util/xyarray.h"
#include "util/sort.h"
#include "util/term.h"
#include "util/intlist.h"
#include "util/parse-branch-options.h"
#include "arch/common.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 "sane_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 perf_evsel *evsel = hists_to_evsel(he->hists);
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 &&
!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->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 [email protected]\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 perf_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 perf_evsel *evsel = hists_to_evsel(he->hists);
struct annotation *notes;
struct symbol *symbol;
int more;
if (!he)
return;
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__print_sym_table(struct perf_top *top)
{
char bf[160];
int printed = 0;
const int win_width = top->winsize.ws_col - 1;
struct perf_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;
}
if (top->evlist->enabled) {
if (top->zero) {
hists__delete_entries(hists);
} else {
hists__decay_entries(hists, top->hide_user_symbols,
top->hide_kernel_symbols);
}
}
hists__collapse_resort(hists, NULL);
perf_evsel__output_resort(evsel, NULL);
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(&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->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->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->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->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;
}
evlist__for_each_entry(top->evlist, top->sym_evsel)
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->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;
struct perf_evsel *evsel = t->sym_evsel;
struct hists *hists;
if (t->evlist->selected != NULL)
t->sym_evsel = t->evlist->selected;
hists = evsel__hists(evsel);
if (t->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);
perf_evsel__output_resort(evsel, NULL);
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 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,
};
/* 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);
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);
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 perf_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 perf_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.\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 perf_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 perf_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 perf_evlist *evlist = top->evlist;
struct perf_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 perf_evlist *evlist = top->evlist;
int i;
if (overwrite)
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
for (i = 0; i < top->evlist->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 perf_evlist *evlist = top->evlist;
struct perf_evsel_config_term *term;
struct list_head *config_terms;
struct perf_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 == perf_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 perf_evsel *evsel)
{
struct record_opts *opts = &top->record_opts;
struct perf_evlist *evlist = top->evlist;
struct perf_evsel *counter;
if (!opts->overwrite)
return 0;
/* only fall back when first event fails */
if (evsel != perf_evlist__first(evlist))
return 0;
evlist__for_each_entry(evlist, counter)
counter->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 perf_evsel *counter;
struct perf_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 (perf_evsel__open(counter, top->evlist->cpus,
top->evlist->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 &&