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linux/tools/perf/builtin-top.c
Arnaldo Carvalho de Melo aece948f5d perf evlist: Fix per thread mmap setup 
The PERF_EVENT_IOC_SET_OUTPUT ioctl was returning -EINVAL when using
--pid when monitoring multithreaded apps, as we can only share a ring
buffer for events on the same thread if not doing per cpu.

Fix it by using per thread ring buffers.

Tested with:

[root@felicio ~]# tuna -t 26131 -CP | nl
  1                      thread       ctxt_switches
  2    pid SCHED_ rtpri affinity voluntary nonvoluntary             cmd
  3 26131   OTHER     0      0,1  10814276      2397830 chromium-browse
  4  642    OTHER     0      0,1     14688            0 chromium-browse
  5  26148  OTHER     0      0,1    713602       115479 chromium-browse
  6  26149  OTHER     0      0,1    801958         2262 chromium-browse
  7  26150  OTHER     0      0,1   1271128          248 chromium-browse
  8  26151  OTHER     0      0,1         3            0 chromium-browse
  9  27049  OTHER     0      0,1     36796            9 chromium-browse
 10  618    OTHER     0      0,1     14711            0 chromium-browse
 11  661    OTHER     0      0,1     14593            0 chromium-browse
 12  29048  OTHER     0      0,1     28125            0 chromium-browse
 13  26143  OTHER     0      0,1   2202789          781 chromium-browse
[root@felicio ~]#

So 11 threads under pid 26131, then:

[root@felicio ~]# perf record -F 50000 --pid 26131

[root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
  1 7fa4a2538000-7fa4a25b9000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  2 7fa4a25b9000-7fa4a263a000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  3 7fa4a263a000-7fa4a26bb000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  4 7fa4a26bb000-7fa4a273c000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  5 7fa4a273c000-7fa4a27bd000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  6 7fa4a27bd000-7fa4a283e000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  7 7fa4a283e000-7fa4a28bf000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  8 7fa4a28bf000-7fa4a2940000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
  9 7fa4a2940000-7fa4a29c1000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
 10 7fa4a29c1000-7fa4a2a42000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
 11 7fa4a2a42000-7fa4a2ac3000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
[root@felicio ~]#

11 mmaps, one per thread since we didn't specify any CPU list, so we need one
mmap per thread and:

[root@felicio ~]# perf record -F 50000 --pid 26131
^M
^C[ perf record: Woken up 79 times to write data ]
[ perf record: Captured and wrote 20.614 MB perf.data (~900639 samples) ]

[root@felicio ~]# perf report -D | grep PERF_RECORD_SAMPLE | cut -d/ -f2 | cut -d: -f1 | sort -n | uniq -c | sort -nr | nl
     1	 371310 26131
     2	  96516 26148
     3	  95694 26149
     4	  95203 26150
     5	   7291 26143
     6	     87 27049
     7	     76 661
     8	     60 29048
     9	     47 618
    10	     43 642
[root@felicio ~]#

Ok, one of the threads, 26151 was quiescent, so no samples there, but all the
others are there.

Then, if I specify one CPU:

[root@felicio ~]# perf record -F 50000 --pid 26131 --cpu 1
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.680 MB perf.data (~29730 samples) ]

[root@felicio ~]# perf report -D | grep PERF_RECORD_SAMPLE | cut -d/ -f2 | cut -d: -f1 | sort -n | uniq -c | sort -nr | nl
     1	   8444 26131
     2	   2584 26149
     3	   2518 26148
     4	   2324 26150
     5	    123 26143
     6	      9 661
     7	      9 29048
[root@felicio ~]#

This machine has two cores, so fewer threads appeared on the radar, and:

[root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
 1 7f484b922000-7f484b9a3000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
[root@felicio ~]#

Just one mmap, as now we can use just one per-cpu buffer instead of the
per-thread needed in the previous case.

For global profiling:

[root@felicio ~]# perf record -F 50000 -a
^C[ perf record: Woken up 26 times to write data ]
[ perf record: Captured and wrote 7.128 MB perf.data (~311412 samples) ]

[root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
     1	7fb49b435000-7fb49b4b6000 rwxs 00000000 00:09 4064                       anon_inode:[perf_event]
     2	7fb49b4b6000-7fb49b537000 rwxs 00000000 00:09 4064                       anon_inode:[perf_event]
[root@felicio ~]#

It uses per-cpu buffers.

For just one thread:

[root@felicio ~]# perf record -F 50000 --tid 26148
^C[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.330 MB perf.data (~14426 samples) ]

[root@felicio ~]# perf report -D | grep PERF_RECORD_SAMPLE | cut -d/ -f2 | cut -d: -f1 | sort -n | uniq -c | sort -nr | nl
     1	   9969 26148
[root@felicio ~]#

[root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
     1	7f286a51b000-7f286a59c000 rwxs 00000000 00:09 4064                       anon_inode:[perf_event]
[root@felicio ~]#

Tested-by: David Ahern <dsahern@gmail.com>
Tested-by: Lin Ming <ming.m.lin@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Link: http://lkml.kernel.org/r/20110426204401.GB1746@ghostprotocols.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-05-15 10:02:14 -03:00

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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>
*
* 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/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>
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
static struct perf_top top = {
.count_filter = 5,
.delay_secs = 2,
.display_weighted = -1,
.target_pid = -1,
.target_tid = -1,
.active_symbols = LIST_HEAD_INIT(top.active_symbols),
.active_symbols_lock = PTHREAD_MUTEX_INITIALIZER,
.active_symbols_cond = PTHREAD_COND_INITIALIZER,
.freq = 1000, /* 1 KHz */
};
static bool system_wide = false;
static bool use_tui, use_stdio;
static int default_interval = 0;
static bool inherit = false;
static int realtime_prio = 0;
static bool group = false;
static unsigned int page_size;
static unsigned int mmap_pages = 128;
static bool dump_symtab = false;
static struct winsize winsize;
static const char *sym_filter = NULL;
struct sym_entry *sym_filter_entry_sched = 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 sym_entry *syme)
{
struct symbol *sym;
struct annotation *notes;
struct map *map;
int err = -1;
if (!syme)
return -1;
sym = sym_entry__symbol(syme);
map = syme->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, syme->map, 0);
if (err == 0) {
out_assign:
top.sym_filter_entry = syme;
}
pthread_mutex_unlock(&notes->lock);
return err;
}
static void __zero_source_counters(struct sym_entry *syme)
{
struct symbol *sym = sym_entry__symbol(syme);
symbol__annotate_zero_histograms(sym);
}
static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
{
struct annotation *notes;
struct symbol *sym;
if (syme != top.sym_filter_entry)
return;
sym = sym_entry__symbol(syme);
notes = symbol__annotation(sym);
if (pthread_mutex_trylock(&notes->lock))
return;
ip = syme->map->map_ip(syme->map, ip);
symbol__inc_addr_samples(sym, syme->map, counter, ip);
pthread_mutex_unlock(&notes->lock);
}
static void show_details(struct sym_entry *syme)
{
struct annotation *notes;
struct symbol *symbol;
int more;
if (!syme)
return;
symbol = sym_entry__symbol(syme);
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, syme->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 void __list_insert_active_sym(struct sym_entry *syme)
{
list_add(&syme->node, &top.active_symbols);
}
static void print_sym_table(struct perf_session *session)
{
char bf[160];
int printed = 0;
struct rb_node *nd;
struct sym_entry *syme;
struct rb_root tmp = RB_ROOT;
const int win_width = winsize.ws_col - 1;
int sym_width, dso_width, dso_short_width;
float sum_ksamples = perf_top__decay_samples(&top, &tmp);
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 (session->hists.stats.total_lost != 0) {
color_fprintf(stdout, PERF_COLOR_RED, "WARNING:");
printf(" LOST %" PRIu64 " events, Check IO/CPU overload\n",
session->hists.stats.total_lost);
}
if (top.sym_filter_entry) {
show_details(top.sym_filter_entry);
return;
}
perf_top__find_widths(&top, &tmp, &dso_width, &dso_short_width,
&sym_width);
if (sym_width + dso_width > winsize.ws_col - 29) {
dso_width = dso_short_width;
if (sym_width + dso_width > winsize.ws_col - 29)
sym_width = winsize.ws_col - dso_width - 29;
}
putchar('\n');
if (top.evlist->nr_entries == 1)
printf(" samples pcnt");
else
printf(" weight samples pcnt");
if (verbose)
printf(" RIP ");
printf(" %-*.*s DSO\n", sym_width, sym_width, "function");
printf(" %s _______ _____",
top.evlist->nr_entries == 1 ? " " : "______");
if (verbose)
printf(" ________________");
printf(" %-*.*s", sym_width, sym_width, graph_line);
printf(" %-*.*s", dso_width, dso_width, graph_line);
puts("\n");
for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
struct symbol *sym;
double pcnt;
syme = rb_entry(nd, struct sym_entry, rb_node);
sym = sym_entry__symbol(syme);
if (++printed > top.print_entries ||
(int)syme->snap_count < top.count_filter)
continue;
pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
sum_ksamples));
if (top.evlist->nr_entries == 1 || !top.display_weighted)
printf("%20.2f ", syme->weight);
else
printf("%9.1f %10ld ", syme->weight, syme->snap_count);
percent_color_fprintf(stdout, "%4.1f%%", pcnt);
if (verbose)
printf(" %016" PRIx64, sym->start);
printf(" %-*.*s", sym_width, sym_width, sym->name);
printf(" %-*.*s\n", dso_width, dso_width,
dso_width >= syme->map->dso->long_name_len ?
syme->map->dso->long_name :
syme->map->dso->short_name);
}
}
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 sym_entry **target, const char *msg)
{
char *buf = malloc(0), *p;
struct sym_entry *syme = *target, *n, *found = NULL;
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;
pthread_mutex_lock(&top.active_symbols_lock);
syme = list_entry(top.active_symbols.next, struct sym_entry, node);
pthread_mutex_unlock(&top.active_symbols_lock);
list_for_each_entry_safe_from(syme, n, &top.active_symbols, node) {
struct symbol *sym = sym_entry__symbol(syme);
if (!strcmp(buf, sym->name)) {
found = syme;
break;
}
}
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 = sym_entry__symbol(top.sym_filter_entry);
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");
if (top.evlist->nr_entries > 1)
fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", top.display_weighted ? 1 : 0);
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':
case 'w':
return top.evlist->nr_entries > 1 ? 1 : 0;
default:
break;
}
return 0;
}
static void handle_keypress(struct perf_session *session, 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(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 sym_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 'w':
top.display_weighted = ~top.display_weighted;
break;
case 'z':
top.zero = !top.zero;
break;
default:
break;
}
}
static void *display_thread_tui(void *arg __used)
{
int err = 0;
pthread_mutex_lock(&top.active_symbols_lock);
while (list_empty(&top.active_symbols)) {
err = pthread_cond_wait(&top.active_symbols_cond,
&top.active_symbols_lock);
if (err)
break;
}
pthread_mutex_unlock(&top.active_symbols_lock);
if (!err)
perf_top__tui_browser(&top);
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;
struct perf_session *session = (struct perf_session *) arg;
tcgetattr(0, &save);
tc = save;
tc.c_lflag &= ~(ICANON | ECHO);
tc.c_cc[VMIN] = 0;
tc.c_cc[VTIME] = 0;
repeat:
delay_msecs = top.delay_secs * 1000;
tcsetattr(0, TCSANOW, &tc);
/* trash return*/
getc(stdin);
do {
print_sym_table(session);
} while (!poll(&stdin_poll, 1, delay_msecs) == 1);
c = getc(stdin);
tcsetattr(0, TCSAFLUSH, &save);
handle_keypress(session, 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, struct symbol *sym)
{
struct sym_entry *syme;
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;
syme = symbol__priv(sym);
syme->map = map;
symbol__annotate_init(map, sym);
if (!top.sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
/* schedule initial sym_filter_entry setup */
sym_filter_entry_sched = syme;
sym_filter = NULL;
}
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_sample *sample,
struct perf_session *session)
{
u64 ip = event->ip.ip;
struct sym_entry *syme;
struct addr_location al;
struct machine *machine;
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 (al.sym == NULL) {
/*
* 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 (al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
ui__warning("The %s file can't be used\n",
symbol_conf.vmlinux_name);
exit_browser(0);
exit(1);
}
return;
}
/* let's see, whether we need to install initial sym_filter_entry */
if (sym_filter_entry_sched) {
top.sym_filter_entry = sym_filter_entry_sched;
sym_filter_entry_sched = NULL;
if (parse_source(top.sym_filter_entry) < 0) {
struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
pr_err("Can't annotate %s", sym->name);
if (top.sym_filter_entry->map->dso->symtab_type == SYMTAB__KALLSYMS) {
pr_err(": No vmlinux file was found in the path:\n");
machine__fprintf_vmlinux_path(machine, stderr);
} else
pr_err(".\n");
exit(1);
}
}
syme = symbol__priv(al.sym);
if (!al.sym->ignore) {
struct perf_evsel *evsel;
evsel = perf_evlist__id2evsel(top.evlist, sample->id);
assert(evsel != NULL);
syme->count[evsel->idx]++;
record_precise_ip(syme, evsel->idx, ip);
pthread_mutex_lock(&top.active_symbols_lock);
if (list_empty(&syme->node) || !syme->node.next) {
static bool first = true;
__list_insert_active_sym(syme);
if (first) {
pthread_cond_broadcast(&top.active_symbols_cond);
first = false;
}
}
pthread_mutex_unlock(&top.active_symbols_lock);
}
}
static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
{
struct perf_sample sample;
union perf_event *event;
while ((event = perf_evlist__mmap_read(top.evlist, idx)) != NULL) {
perf_session__parse_sample(self, event, &sample);
if (event->header.type == PERF_RECORD_SAMPLE)
perf_event__process_sample(event, &sample, self);
else
perf_event__process(event, &sample, self);
}
}
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;
list_for_each_entry(counter, &evlist->entries, node) {
struct perf_event_attr *attr = &counter->attr;
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;
}
attr->mmap = 1;
attr->inherit = inherit;
try_again:
if (perf_evsel__open(counter, top.evlist->cpus,
top.evlist->threads, group) < 0) {
int err = errno;
if (err == EPERM || err == EACCES) {
ui__warning_paranoid();
goto out_err;
}
/*
* 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 __cmd_top(void)
{
pthread_t thread;
int ret __used;
/*
* 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.
*/
struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
if (session == NULL)
return -ENOMEM;
if (top.target_tid != -1)
perf_event__synthesize_thread_map(top.evlist->threads,
perf_event__process, session);
else
perf_event__synthesize_threads(perf_event__process, session);
start_counters(top.evlist);
session->evlist = top.evlist;
perf_session__update_sample_type(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(session);
if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
display_thread), session)) {
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(session);
if (hits == top.samples)
ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
}
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),
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('s', "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_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;
page_size = sysconf(_SC_PAGE_SIZE);
argc = parse_options(argc, argv, options, top_usage, 0);
if (argc)
usage_with_options(top_usage, options);
/*
* XXX For now start disabled, only using TUI if explicitely asked for.
* Change that when handle_keys equivalent gets written, live annotation
* done, etc.
*/
use_browser = 0;
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 sym_entry) + sizeof(struct annotation) +
(top.evlist->nr_entries + 1) * sizeof(unsigned long));
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
if (symbol__init() < 0)
return -1;
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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