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kernel-fxtec-pro1x/tools/perf/builtin-top.c
Arnaldo Carvalho de Melo f9e3d4b1a9 perf top: Fix live annotation in the --stdio interface 
In the old --stdio interface the annotation is done just after one
selects a symbol, while in --tui, now the default when the required libs
are installed, we annotate all symbols with samples so that when
annotation is asked we see what happened recently on that symbol.

To achieve that the --stdio variant checks if the hist_entry being
processed is the one selected by the user via the 's' hotkey. What
happens now that we share the hist_entry abstractions with 'perf report'
is that for minimizing locking contention multiple rb_trees are used,
one for collecting the samples and other to browse/show them after
resorting it by number of samples and decay them, which is done
periodically.

So the simple test in record_precise_ip doesn't work as we move
hist_entries between those rb_trees. To fix it just check that the
underlying struct symbol associated with those hist_entries is the same.

Reported-by: Mike Galbraith <efault@gmx.de>
Tested-by: Mike Galbraith <efault@gmx.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-bcfnraqkux88fox9ba9767ds@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-11-03 11:31:26 -02:00

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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 <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/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/debug.h"
#include <assert.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/mman.h>
#include <linux/unistd.h>
#include <linux/types.h>
static struct perf_top top = {
.count_filter = 5,
.delay_secs = 2,
.target_pid = -1,
.target_tid = -1,
.freq = 1000, /* 1 KHz */
};
static bool system_wide = false;
static bool use_tui, use_stdio;
static bool sort_has_symbols;
static bool dont_use_callchains;
static char callchain_default_opt[] = "fractal,0.5,callee";
static int default_interval = 0;
static bool kptr_restrict_warned;
static bool vmlinux_warned;
static bool inherit = false;
static int realtime_prio = 0;
static bool group = false;
static bool sample_id_all_avail = true;
static unsigned int mmap_pages = 128;
static bool dump_symtab = false;
static struct winsize winsize;
static const char *sym_filter = NULL;
static int sym_pcnt_filter = 5;
/*
* Source functions
*/
void get_term_dimensions(struct winsize *ws)
{
char *s = getenv("LINES");
if (s != NULL) {
ws->ws_row = atoi(s);
s = getenv("COLUMNS");
if (s != NULL) {
ws->ws_col = atoi(s);
if (ws->ws_row && ws->ws_col)
return;
}
}
#ifdef TIOCGWINSZ
if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
ws->ws_row && ws->ws_col)
return;
#endif
ws->ws_row = 25;
ws->ws_col = 80;
}
static void update_print_entries(struct winsize *ws)
{
top.print_entries = ws->ws_row;
if (top.print_entries > 9)
top.print_entries -= 9;
}
static void sig_winch_handler(int sig __used)
{
get_term_dimensions(&winsize);
update_print_entries(&winsize);
}
static int parse_source(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 == SYMTAB__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(&notes->lock);
goto out_assign;
}
pthread_mutex_lock(&notes->lock);
if (symbol__alloc_hist(sym, top.evlist->nr_entries) < 0) {
pthread_mutex_unlock(&notes->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(&notes->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 record_precise_ip(struct hist_entry *he, int counter, u64 ip)
{
struct annotation *notes;
struct symbol *sym;
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(&notes->lock))
return;
if (notes->src == NULL &&
symbol__alloc_hist(sym, top.evlist->nr_entries) < 0) {
pthread_mutex_unlock(&notes->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);
symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
pthread_mutex_unlock(&notes->lock);
}
static void show_details(struct hist_entry *he)
{
struct annotation *notes;
struct symbol *symbol;
int more;
if (!he)
return;
symbol = he->ms.sym;
notes = symbol__annotation(symbol);
pthread_mutex_lock(&notes->lock);
if (notes->src == NULL)
goto out_unlock;
printf("Showing %s for %s\n", event_name(top.sym_evsel), symbol->name);
printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
more = symbol__annotate_printf(symbol, he->ms.map, top.sym_evsel->idx,
0, 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(&notes->lock);
}
static const char CONSOLE_CLEAR[] = "";
static struct hist_entry *
perf_session__add_hist_entry(struct perf_session *session,
struct addr_location *al,
struct perf_sample *sample,
struct perf_evsel *evsel)
{
struct hist_entry *he;
he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
if (he == NULL)
return NULL;
session->hists.stats.total_period += sample->period;
hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
return he;
}
static void print_sym_table(void)
{
char bf[160];
int printed = 0;
const int win_width = 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) {
show_details(top.sym_filter_entry);
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, winsize.ws_row - 3);
putchar('\n');
hists__fprintf(&top.sym_evsel->hists, NULL, false, false,
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 prompt_symbol(struct hist_entry **target, const char *msg)
{
char *buf = malloc(0), *p;
struct hist_entry *syme = *target, *n, *found = NULL;
struct rb_node *next;
size_t dummy = 0;
/* zero counters of active symbol */
if (syme) {
__zero_source_counters(syme);
*target = 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);
return;
} else
parse_source(found);
out_free:
free(buf);
}
static void print_mapped_keys(void)
{
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", event_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", 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 key_mapped(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 void handle_keypress(int c)
{
if (!key_mapped(c)) {
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
struct termios tc, save;
print_mapped_keys();
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 (!key_mapped(c))
return;
}
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) {
sig_winch_handler(SIGWINCH);
signal(SIGWINCH, sig_winch_handler);
} 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:");
list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
fprintf(stderr, "\n\t%d %s", top.sym_evsel->idx, event_name(top.sym_evsel));
prompt_integer(&counter, "Enter details event counter");
if (counter >= top.evlist->nr_entries) {
top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
fprintf(stderr, "Sorry, no such event, using %s.\n", event_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 = list_entry(top.evlist->entries.next, struct perf_evsel, node);
break;
case 'f':
prompt_integer(&top.count_filter, "Enter display event count filter");
break;
case 'F':
prompt_percent(&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 (dump_symtab)
perf_session__fprintf_dsos(top.session, stderr);
exit(0);
case 's':
prompt_symbol(&top.sym_filter_entry, "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;
}
}
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,
top.hide_user_symbols,
top.hide_kernel_symbols);
}
static void *display_thread_tui(void *arg __used)
{
const char *help = "For a higher level overview, try: perf top --sort comm,dso";
perf_top__sort_new_samples(&top);
perf_evlist__tui_browse_hists(top.evlist, help,
perf_top__sort_new_samples,
&top, top.delay_secs);
exit_browser(0);
exit(0);
return NULL;
}
static void *display_thread(void *arg __used)
{
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
struct termios tc, save;
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 (1) {
print_sym_table();
/*
* 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:
goto process_hotkey;
}
}
process_hotkey:
c = getc(stdin);
tcsetattr(0, TCSAFLUSH, &save);
handle_keypress(c);
goto repeat;
return NULL;
}
/* Tag samples to be skipped. */
static const char *skip_symbols[] = {
"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 __used, 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(const union perf_event *event,
struct perf_evsel *evsel,
struct perf_sample *sample,
struct perf_session *session)
{
struct symbol *parent = NULL;
u64 ip = event->ip.ip;
struct addr_location al;
struct machine *machine;
int err;
u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
++top.samples;
switch (origin) {
case PERF_RECORD_MISC_USER:
++top.us_samples;
if (top.hide_user_symbols)
return;
machine = perf_session__find_host_machine(session);
break;
case PERF_RECORD_MISC_KERNEL:
++top.kernel_samples;
if (top.hide_kernel_symbols)
return;
machine = perf_session__find_host_machine(session);
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.
*/
return;
default:
return;
}
if (!machine && perf_guest) {
pr_err("Can't find guest [%d]'s kernel information\n",
event->ip.pid);
return;
}
if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
top.exact_samples++;
if (perf_event__preprocess_sample(event, session, &al, sample,
symbol_filter) < 0 ||
al.filtered)
return;
if (!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);
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 (!kptr_restrict_warned && !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);
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 = perf_session__resolve_callchain(session, al.thread,
sample->callchain, &parent);
if (err)
return;
}
he = perf_session__add_hist_entry(session, &al, sample, evsel);
if (he == NULL) {
pr_err("Problem incrementing symbol period, skipping event\n");
return;
}
if (symbol_conf.use_callchain) {
err = callchain_append(he->callchain, &session->callchain_cursor,
sample->period);
if (err)
return;
}
if (sort_has_symbols)
record_precise_ip(he, evsel->idx, ip);
}
return;
}
static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
{
struct perf_sample sample;
struct perf_evsel *evsel;
union perf_event *event;
int ret;
while ((event = perf_evlist__mmap_read(top.evlist, idx)) != NULL) {
ret = perf_session__parse_sample(self, event, &sample);
if (ret) {
pr_err("Can't parse sample, err = %d\n", ret);
continue;
}
evsel = perf_evlist__id2evsel(self->evlist, sample.id);
assert(evsel != NULL);
if (event->header.type == PERF_RECORD_SAMPLE)
perf_event__process_sample(event, evsel, &sample, self);
else if (event->header.type < PERF_RECORD_MAX) {
hists__inc_nr_events(&evsel->hists, event->header.type);
perf_event__process(event, &sample, self);
} else
++self->hists.stats.nr_unknown_events;
}
}
static void perf_session__mmap_read(struct perf_session *self)
{
int i;
for (i = 0; i < top.evlist->nr_mmaps; i++)
perf_session__mmap_read_idx(self, i);
}
static void start_counters(struct perf_evlist *evlist)
{
struct perf_evsel *counter, *first;
first = list_entry(evlist->entries.next, struct perf_evsel, node);
list_for_each_entry(counter, &evlist->entries, node) {
struct perf_event_attr *attr = &counter->attr;
struct xyarray *group_fd = NULL;
if (group && counter != first)
group_fd = first->fd;
attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
if (top.freq) {
attr->sample_type |= PERF_SAMPLE_PERIOD;
attr->freq = 1;
attr->sample_freq = top.freq;
}
if (evlist->nr_entries > 1) {
attr->sample_type |= PERF_SAMPLE_ID;
attr->read_format |= PERF_FORMAT_ID;
}
if (symbol_conf.use_callchain)
attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
attr->mmap = 1;
attr->comm = 1;
attr->inherit = inherit;
retry_sample_id:
attr->sample_id_all = sample_id_all_avail ? 1 : 0;
try_again:
if (perf_evsel__open(counter, top.evlist->cpus,
top.evlist->threads, group,
group_fd) < 0) {
int err = errno;
if (err == EPERM || err == EACCES) {
ui__error_paranoid();
goto out_err;
} else if (err == EINVAL && sample_id_all_avail) {
/*
* Old kernel, no attr->sample_id_type_all field
*/
sample_id_all_avail = false;
goto retry_sample_id;
}
/*
* If it's cycles then fall back to hrtimer
* based cpu-clock-tick sw counter, which
* is always available even if no PMU support:
*/
if (attr->type == PERF_TYPE_HARDWARE &&
attr->config == PERF_COUNT_HW_CPU_CYCLES) {
if (verbose)
ui__warning("Cycles event not supported,\n"
"trying to fall back to cpu-clock-ticks\n");
attr->type = PERF_TYPE_SOFTWARE;
attr->config = PERF_COUNT_SW_CPU_CLOCK;
goto try_again;
}
if (err == ENOENT) {
ui__warning("The %s event is not supported.\n",
event_name(counter));
goto out_err;
}
ui__warning("The sys_perf_event_open() syscall "
"returned with %d (%s). /bin/dmesg "
"may provide additional information.\n"
"No CONFIG_PERF_EVENTS=y kernel support "
"configured?\n", err, strerror(err));
goto out_err;
}
}
if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) {
ui__warning("Failed to mmap with %d (%s)\n",
errno, strerror(errno));
goto out_err;
}
return;
out_err:
exit_browser(0);
exit(0);
}
static int setup_sample_type(void)
{
if (!sort_has_symbols) {
if (symbol_conf.use_callchain) {
ui__warning("Selected -g but \"sym\" not present in --sort/-s.");
return -EINVAL;
}
} else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
if (callchain_register_param(&callchain_param) < 0) {
ui__warning("Can't register callchain params.\n");
return -EINVAL;
}
}
return 0;
}
static int __cmd_top(void)
{
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 = setup_sample_type();
if (ret)
goto out_delete;
if (top.target_tid != -1)
perf_event__synthesize_thread_map(top.evlist->threads,
perf_event__process, top.session);
else
perf_event__synthesize_threads(perf_event__process, top.session);
start_counters(top.evlist);
top.session->evlist = top.evlist;
perf_session__update_sample_type(top.session);
/* Wait for a minimal set of events before starting the snapshot */
poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
perf_session__mmap_read(top.session);
if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
display_thread), NULL)) {
printf("Could not create display thread.\n");
exit(-1);
}
if (realtime_prio) {
struct sched_param param;
param.sched_priority = realtime_prio;
if (sched_setscheduler(0, SCHED_FIFO, &param)) {
printf("Could not set realtime priority.\n");
exit(-1);
}
}
while (1) {
u64 hits = top.samples;
perf_session__mmap_read(top.session);
if (hits == top.samples)
ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
}
out_delete:
perf_session__delete(top.session);
top.session = NULL;
return 0;
}
static int
parse_callchain_opt(const struct option *opt __used, const char *arg,
int unset)
{
char *tok, *tok2;
char *endptr;
/*
* --no-call-graph
*/
if (unset) {
dont_use_callchains = true;
return 0;
}
symbol_conf.use_callchain = true;
if (!arg)
return 0;
tok = strtok((char *)arg, ",");
if (!tok)
return -1;
/* get the output mode */
if (!strncmp(tok, "graph", strlen(arg)))
callchain_param.mode = CHAIN_GRAPH_ABS;
else if (!strncmp(tok, "flat", strlen(arg)))
callchain_param.mode = CHAIN_FLAT;
else if (!strncmp(tok, "fractal", strlen(arg)))
callchain_param.mode = CHAIN_GRAPH_REL;
else if (!strncmp(tok, "none", strlen(arg))) {
callchain_param.mode = CHAIN_NONE;
symbol_conf.use_callchain = false;
return 0;
}
else
return -1;
/* get the min percentage */
tok = strtok(NULL, ",");
if (!tok)
goto setup;
callchain_param.min_percent = strtod(tok, &endptr);
if (tok == endptr)
return -1;
/* get the print limit */
tok2 = strtok(NULL, ",");
if (!tok2)
goto setup;
if (tok2[0] != 'c') {
callchain_param.print_limit = strtod(tok2, &endptr);
tok2 = strtok(NULL, ",");
if (!tok2)
goto setup;
}
/* get the call chain order */
if (!strcmp(tok2, "caller"))
callchain_param.order = ORDER_CALLER;
else if (!strcmp(tok2, "callee"))
callchain_param.order = ORDER_CALLEE;
else
return -1;
setup:
if (callchain_register_param(&callchain_param) < 0) {
fprintf(stderr, "Can't register callchain params\n");
return -1;
}
return 0;
}
static const char * const top_usage[] = {
"perf top [<options>]",
NULL
};
static const struct option options[] = {
OPT_CALLBACK('e', "event", &top.evlist, "event",
"event selector. use 'perf list' to list available events",
parse_events_option),
OPT_INTEGER('c', "count", &default_interval,
"event period to sample"),
OPT_INTEGER('p', "pid", &top.target_pid,
"profile events on existing process id"),
OPT_INTEGER('t', "tid", &top.target_tid,
"profile events on existing thread id"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
OPT_STRING('C', "cpu", &top.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", &mmap_pages, "number of mmap data pages"),
OPT_INTEGER('r', "realtime", &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", &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", &group,
"put the counters into a counter group"),
OPT_BOOLEAN('i', "inherit", &inherit,
"child tasks inherit counters"),
OPT_STRING(0, "sym-annotate", &sym_filter, "symbol name",
"symbol to annotate"),
OPT_BOOLEAN('z', "zero", &top.zero,
"zero history across updates"),
OPT_INTEGER('F', "freq", &top.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", &use_tui, "Use the TUI interface"),
OPT_BOOLEAN(0, "stdio", &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"),
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", NULL, "output_type,min_percent, call_order",
"Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
"Default: fractal,0.5,callee", &parse_callchain_opt,
callchain_default_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", &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_END()
};
int cmd_top(int argc, const char **argv, const char *prefix __used)
{
struct perf_evsel *pos;
int status = -ENOMEM;
top.evlist = perf_evlist__new(NULL, NULL);
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";
setup_sorting(top_usage, options);
if (use_stdio)
use_browser = 0;
else if (use_tui)
use_browser = 1;
setup_browser(false);
/* CPU and PID are mutually exclusive */
if (top.target_tid > 0 && top.cpu_list) {
printf("WARNING: PID switch overriding CPU\n");
sleep(1);
top.cpu_list = NULL;
}
if (top.target_pid != -1)
top.target_tid = top.target_pid;
if (perf_evlist__create_maps(top.evlist, top.target_pid,
top.target_tid, top.cpu_list) < 0)
usage_with_options(top_usage, options);
if (!top.evlist->nr_entries &&
perf_evlist__add_default(top.evlist) < 0) {
pr_err("Not enough memory for event selector list\n");
return -ENOMEM;
}
if (top.delay_secs < 1)
top.delay_secs = 1;
/*
* User specified count overrides default frequency.
*/
if (default_interval)
top.freq = 0;
else if (top.freq) {
default_interval = top.freq;
} else {
fprintf(stderr, "frequency and count are zero, aborting\n");
exit(EXIT_FAILURE);
}
list_for_each_entry(pos, &top.evlist->entries, node) {
if (perf_evsel__alloc_fd(pos, top.evlist->cpus->nr,
top.evlist->threads->nr) < 0)
goto out_free_fd;
/*
* Fill in the ones not specifically initialized via -c:
*/
if (pos->attr.sample_period)
continue;
pos->attr.sample_period = default_interval;
}
if (perf_evlist__alloc_pollfd(top.evlist) < 0 ||
perf_evlist__alloc_mmap(top.evlist) < 0)
goto out_free_fd;
top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
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.
*/
sort_has_symbols = sort_sym.list.next != NULL;
get_term_dimensions(&winsize);
if (top.print_entries == 0) {
update_print_entries(&winsize);
signal(SIGWINCH, sig_winch_handler);
}
status = __cmd_top();
out_free_fd:
perf_evlist__delete(top.evlist);
return status;
}
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