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builtin-stat.c
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builtin-stat.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* builtin-stat.c
*
* Builtin stat command: Give a precise performance counters summary
* overview about any workload, CPU or specific PID.
*
* Sample output:
$ perf stat ./hackbench 10
Time: 0.118
Performance counter stats for './hackbench 10':
1708.761321 task-clock # 11.037 CPUs utilized
41,190 context-switches # 0.024 M/sec
6,735 CPU-migrations # 0.004 M/sec
17,318 page-faults # 0.010 M/sec
5,205,202,243 cycles # 3.046 GHz
3,856,436,920 stalled-cycles-frontend # 74.09% frontend cycles idle
1,600,790,871 stalled-cycles-backend # 30.75% backend cycles idle
2,603,501,247 instructions # 0.50 insns per cycle
# 1.48 stalled cycles per insn
484,357,498 branches # 283.455 M/sec
6,388,934 branch-misses # 1.32% of all branches
0.154822978 seconds time elapsed
*
* Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <[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]>
* Jaswinder Singh Rajput <[email protected]>
*/
#include "builtin.h"
#include "perf.h"
#include "util/cgroup.h"
#include <subcmd/parse-options.h>
#include "util/parse-events.h"
#include "util/pmu.h"
#include "util/event.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/debug.h"
#include "util/color.h"
#include "util/stat.h"
#include "util/header.h"
#include "util/cpumap.h"
#include "util/thread_map.h"
#include "util/counts.h"
#include "util/group.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/string2.h"
#include "util/metricgroup.h"
#include "util/synthetic-events.h"
#include "util/target.h"
#include "util/time-utils.h"
#include "util/top.h"
#include "util/affinity.h"
#include "util/pfm.h"
#include "asm/bug.h"
#include <linux/time64.h>
#include <linux/zalloc.h>
#include <api/fs/fs.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <inttypes.h>
#include <locale.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <perf/evlist.h>
#define DEFAULT_SEPARATOR " "
#define FREEZE_ON_SMI_PATH "devices/cpu/freeze_on_smi"
static void print_counters(struct timespec *ts, int argc, const char **argv);
/* Default events used for perf stat -T */
static const char *transaction_attrs = {
"task-clock,"
"{"
"instructions,"
"cycles,"
"cpu/cycles-t/,"
"cpu/tx-start/,"
"cpu/el-start/,"
"cpu/cycles-ct/"
"}"
};
/* More limited version when the CPU does not have all events. */
static const char * transaction_limited_attrs = {
"task-clock,"
"{"
"instructions,"
"cycles,"
"cpu/cycles-t/,"
"cpu/tx-start/"
"}"
};
static const char * topdown_attrs[] = {
"topdown-total-slots",
"topdown-slots-retired",
"topdown-recovery-bubbles",
"topdown-fetch-bubbles",
"topdown-slots-issued",
NULL,
};
static const char *smi_cost_attrs = {
"{"
"msr/aperf/,"
"msr/smi/,"
"cycles"
"}"
};
static struct evlist *evsel_list;
static struct target target = {
.uid = UINT_MAX,
};
#define METRIC_ONLY_LEN 20
static volatile pid_t child_pid = -1;
static int detailed_run = 0;
static bool transaction_run;
static bool topdown_run = false;
static bool smi_cost = false;
static bool smi_reset = false;
static int big_num_opt = -1;
static bool group = false;
static const char *pre_cmd = NULL;
static const char *post_cmd = NULL;
static bool sync_run = false;
static bool forever = false;
static bool force_metric_only = false;
static struct timespec ref_time;
static bool append_file;
static bool interval_count;
static const char *output_name;
static int output_fd;
struct perf_stat {
bool record;
struct perf_data data;
struct perf_session *session;
u64 bytes_written;
struct perf_tool tool;
bool maps_allocated;
struct perf_cpu_map *cpus;
struct perf_thread_map *threads;
enum aggr_mode aggr_mode;
};
static struct perf_stat perf_stat;
#define STAT_RECORD perf_stat.record
static volatile int done = 0;
static struct perf_stat_config stat_config = {
.aggr_mode = AGGR_GLOBAL,
.scale = true,
.unit_width = 4, /* strlen("unit") */
.run_count = 1,
.metric_only_len = METRIC_ONLY_LEN,
.walltime_nsecs_stats = &walltime_nsecs_stats,
.big_num = true,
.ctl_fd = -1,
.ctl_fd_ack = -1
};
static bool cpus_map_matched(struct evsel *a, struct evsel *b)
{
if (!a->core.cpus && !b->core.cpus)
return true;
if (!a->core.cpus || !b->core.cpus)
return false;
if (a->core.cpus->nr != b->core.cpus->nr)
return false;
for (int i = 0; i < a->core.cpus->nr; i++) {
if (a->core.cpus->map[i] != b->core.cpus->map[i])
return false;
}
return true;
}
static void evlist__check_cpu_maps(struct evlist *evlist)
{
struct evsel *evsel, *pos, *leader;
char buf[1024];
evlist__for_each_entry(evlist, evsel) {
leader = evsel->leader;
/* Check that leader matches cpus with each member. */
if (leader == evsel)
continue;
if (cpus_map_matched(leader, evsel))
continue;
/* If there's mismatch disable the group and warn user. */
WARN_ONCE(1, "WARNING: grouped events cpus do not match, disabling group:\n");
evsel__group_desc(leader, buf, sizeof(buf));
pr_warning(" %s\n", buf);
if (verbose) {
cpu_map__snprint(leader->core.cpus, buf, sizeof(buf));
pr_warning(" %s: %s\n", leader->name, buf);
cpu_map__snprint(evsel->core.cpus, buf, sizeof(buf));
pr_warning(" %s: %s\n", evsel->name, buf);
}
for_each_group_evsel(pos, leader) {
pos->leader = pos;
pos->core.nr_members = 0;
}
evsel->leader->core.nr_members = 0;
}
}
static inline void diff_timespec(struct timespec *r, struct timespec *a,
struct timespec *b)
{
r->tv_sec = a->tv_sec - b->tv_sec;
if (a->tv_nsec < b->tv_nsec) {
r->tv_nsec = a->tv_nsec + NSEC_PER_SEC - b->tv_nsec;
r->tv_sec--;
} else {
r->tv_nsec = a->tv_nsec - b->tv_nsec ;
}
}
static void perf_stat__reset_stats(void)
{
int i;
perf_evlist__reset_stats(evsel_list);
perf_stat__reset_shadow_stats();
for (i = 0; i < stat_config.stats_num; i++)
perf_stat__reset_shadow_per_stat(&stat_config.stats[i]);
}
static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
if (perf_data__write(&perf_stat.data, event, event->header.size) < 0) {
pr_err("failed to write perf data, error: %m\n");
return -1;
}
perf_stat.bytes_written += event->header.size;
return 0;
}
static int write_stat_round_event(u64 tm, u64 type)
{
return perf_event__synthesize_stat_round(NULL, tm, type,
process_synthesized_event,
NULL);
}
#define WRITE_STAT_ROUND_EVENT(time, interval) \
write_stat_round_event(time, PERF_STAT_ROUND_TYPE__ ## interval)
#define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
static int evsel__write_stat_event(struct evsel *counter, u32 cpu, u32 thread,
struct perf_counts_values *count)
{
struct perf_sample_id *sid = SID(counter, cpu, thread);
return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
process_synthesized_event, NULL);
}
static int read_single_counter(struct evsel *counter, int cpu,
int thread, struct timespec *rs)
{
if (counter->tool_event == PERF_TOOL_DURATION_TIME) {
u64 val = rs->tv_nsec + rs->tv_sec*1000000000ULL;
struct perf_counts_values *count =
perf_counts(counter->counts, cpu, thread);
count->ena = count->run = val;
count->val = val;
return 0;
}
return evsel__read_counter(counter, cpu, thread);
}
/*
* Read out the results of a single counter:
* do not aggregate counts across CPUs in system-wide mode
*/
static int read_counter_cpu(struct evsel *counter, struct timespec *rs, int cpu)
{
int nthreads = perf_thread_map__nr(evsel_list->core.threads);
int thread;
if (!counter->supported)
return -ENOENT;
if (counter->core.system_wide)
nthreads = 1;
for (thread = 0; thread < nthreads; thread++) {
struct perf_counts_values *count;
count = perf_counts(counter->counts, cpu, thread);
/*
* The leader's group read loads data into its group members
* (via evsel__read_counter()) and sets their count->loaded.
*/
if (!perf_counts__is_loaded(counter->counts, cpu, thread) &&
read_single_counter(counter, cpu, thread, rs)) {
counter->counts->scaled = -1;
perf_counts(counter->counts, cpu, thread)->ena = 0;
perf_counts(counter->counts, cpu, thread)->run = 0;
return -1;
}
perf_counts__set_loaded(counter->counts, cpu, thread, false);
if (STAT_RECORD) {
if (evsel__write_stat_event(counter, cpu, thread, count)) {
pr_err("failed to write stat event\n");
return -1;
}
}
if (verbose > 1) {
fprintf(stat_config.output,
"%s: %d: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
evsel__name(counter),
cpu,
count->val, count->ena, count->run);
}
}
return 0;
}
static int read_affinity_counters(struct timespec *rs)
{
struct evsel *counter;
struct affinity affinity;
int i, ncpus, cpu;
if (affinity__setup(&affinity) < 0)
return -1;
ncpus = perf_cpu_map__nr(evsel_list->core.all_cpus);
if (!target__has_cpu(&target) || target__has_per_thread(&target))
ncpus = 1;
evlist__for_each_cpu(evsel_list, i, cpu) {
if (i >= ncpus)
break;
affinity__set(&affinity, cpu);
evlist__for_each_entry(evsel_list, counter) {
if (evsel__cpu_iter_skip(counter, cpu))
continue;
if (!counter->err) {
counter->err = read_counter_cpu(counter, rs,
counter->cpu_iter - 1);
}
}
}
affinity__cleanup(&affinity);
return 0;
}
static void read_counters(struct timespec *rs)
{
struct evsel *counter;
if (!stat_config.summary && (read_affinity_counters(rs) < 0))
return;
evlist__for_each_entry(evsel_list, counter) {
if (counter->err)
pr_debug("failed to read counter %s\n", counter->name);
if (counter->err == 0 && perf_stat_process_counter(&stat_config, counter))
pr_warning("failed to process counter %s\n", counter->name);
counter->err = 0;
}
}
static int runtime_stat_new(struct perf_stat_config *config, int nthreads)
{
int i;
config->stats = calloc(nthreads, sizeof(struct runtime_stat));
if (!config->stats)
return -1;
config->stats_num = nthreads;
for (i = 0; i < nthreads; i++)
runtime_stat__init(&config->stats[i]);
return 0;
}
static void runtime_stat_delete(struct perf_stat_config *config)
{
int i;
if (!config->stats)
return;
for (i = 0; i < config->stats_num; i++)
runtime_stat__exit(&config->stats[i]);
zfree(&config->stats);
}
static void runtime_stat_reset(struct perf_stat_config *config)
{
int i;
if (!config->stats)
return;
for (i = 0; i < config->stats_num; i++)
perf_stat__reset_shadow_per_stat(&config->stats[i]);
}
static void process_interval(void)
{
struct timespec ts, rs;
clock_gettime(CLOCK_MONOTONIC, &ts);
diff_timespec(&rs, &ts, &ref_time);
perf_stat__reset_shadow_per_stat(&rt_stat);
runtime_stat_reset(&stat_config);
read_counters(&rs);
if (STAT_RECORD) {
if (WRITE_STAT_ROUND_EVENT(rs.tv_sec * NSEC_PER_SEC + rs.tv_nsec, INTERVAL))
pr_err("failed to write stat round event\n");
}
init_stats(&walltime_nsecs_stats);
update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000ULL);
print_counters(&rs, 0, NULL);
}
static bool handle_interval(unsigned int interval, int *times)
{
if (interval) {
process_interval();
if (interval_count && !(--(*times)))
return true;
}
return false;
}
static void enable_counters(void)
{
if (stat_config.initial_delay < 0) {
pr_info(EVLIST_DISABLED_MSG);
return;
}
if (stat_config.initial_delay > 0) {
pr_info(EVLIST_DISABLED_MSG);
usleep(stat_config.initial_delay * USEC_PER_MSEC);
}
/*
* We need to enable counters only if:
* - we don't have tracee (attaching to task or cpu)
* - we have initial delay configured
*/
if (!target__none(&target) || stat_config.initial_delay) {
evlist__enable(evsel_list);
if (stat_config.initial_delay > 0)
pr_info(EVLIST_ENABLED_MSG);
}
}
static void disable_counters(void)
{
/*
* If we don't have tracee (attaching to task or cpu), counters may
* still be running. To get accurate group ratios, we must stop groups
* from counting before reading their constituent counters.
*/
if (!target__none(&target))
evlist__disable(evsel_list);
}
static volatile int workload_exec_errno;
/*
* perf_evlist__prepare_workload will send a SIGUSR1
* if the fork fails, since we asked by setting its
* want_signal to true.
*/
static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
void *ucontext __maybe_unused)
{
workload_exec_errno = info->si_value.sival_int;
}
static bool evsel__should_store_id(struct evsel *counter)
{
return STAT_RECORD || counter->core.attr.read_format & PERF_FORMAT_ID;
}
static bool is_target_alive(struct target *_target,
struct perf_thread_map *threads)
{
struct stat st;
int i;
if (!target__has_task(_target))
return true;
for (i = 0; i < threads->nr; i++) {
char path[PATH_MAX];
scnprintf(path, PATH_MAX, "%s/%d", procfs__mountpoint(),
threads->map[i].pid);
if (!stat(path, &st))
return true;
}
return false;
}
static void process_evlist(struct evlist *evlist, unsigned int interval)
{
enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
if (evlist__ctlfd_process(evlist, &cmd) > 0) {
switch (cmd) {
case EVLIST_CTL_CMD_ENABLE:
pr_info(EVLIST_ENABLED_MSG);
if (interval)
process_interval();
break;
case EVLIST_CTL_CMD_DISABLE:
if (interval)
process_interval();
pr_info(EVLIST_DISABLED_MSG);
break;
case EVLIST_CTL_CMD_ACK:
case EVLIST_CTL_CMD_UNSUPPORTED:
default:
break;
}
}
}
static void compute_tts(struct timespec *time_start, struct timespec *time_stop,
int *time_to_sleep)
{
int tts = *time_to_sleep;
struct timespec time_diff;
diff_timespec(&time_diff, time_stop, time_start);
tts -= time_diff.tv_sec * MSEC_PER_SEC +
time_diff.tv_nsec / NSEC_PER_MSEC;
if (tts < 0)
tts = 0;
*time_to_sleep = tts;
}
static int dispatch_events(bool forks, int timeout, int interval, int *times)
{
int child_exited = 0, status = 0;
int time_to_sleep, sleep_time;
struct timespec time_start, time_stop;
if (interval)
sleep_time = interval;
else if (timeout)
sleep_time = timeout;
else
sleep_time = 1000;
time_to_sleep = sleep_time;
while (!done) {
if (forks)
child_exited = waitpid(child_pid, &status, WNOHANG);
else
child_exited = !is_target_alive(&target, evsel_list->core.threads) ? 1 : 0;
if (child_exited)
break;
clock_gettime(CLOCK_MONOTONIC, &time_start);
if (!(evlist__poll(evsel_list, time_to_sleep) > 0)) { /* poll timeout or EINTR */
if (timeout || handle_interval(interval, times))
break;
time_to_sleep = sleep_time;
} else { /* fd revent */
process_evlist(evsel_list, interval);
clock_gettime(CLOCK_MONOTONIC, &time_stop);
compute_tts(&time_start, &time_stop, &time_to_sleep);
}
}
return status;
}
enum counter_recovery {
COUNTER_SKIP,
COUNTER_RETRY,
COUNTER_FATAL,
};
static enum counter_recovery stat_handle_error(struct evsel *counter)
{
char msg[BUFSIZ];
/*
* PPC returns ENXIO for HW counters until 2.6.37
* (behavior changed with commit b0a873e).
*/
if (errno == EINVAL || errno == ENOSYS ||
errno == ENOENT || errno == EOPNOTSUPP ||
errno == ENXIO) {
if (verbose > 0)
ui__warning("%s event is not supported by the kernel.\n",
evsel__name(counter));
counter->supported = false;
/*
* errored is a sticky flag that means one of the counter's
* cpu event had a problem and needs to be reexamined.
*/
counter->errored = true;
if ((counter->leader != counter) ||
!(counter->leader->core.nr_members > 1))
return COUNTER_SKIP;
} else if (evsel__fallback(counter, errno, msg, sizeof(msg))) {
if (verbose > 0)
ui__warning("%s\n", msg);
return COUNTER_RETRY;
} else if (target__has_per_thread(&target) &&
evsel_list->core.threads &&
evsel_list->core.threads->err_thread != -1) {
/*
* For global --per-thread case, skip current
* error thread.
*/
if (!thread_map__remove(evsel_list->core.threads,
evsel_list->core.threads->err_thread)) {
evsel_list->core.threads->err_thread = -1;
return COUNTER_RETRY;
}
}
evsel__open_strerror(counter, &target, errno, msg, sizeof(msg));
ui__error("%s\n", msg);
if (child_pid != -1)
kill(child_pid, SIGTERM);
return COUNTER_FATAL;
}
static int __run_perf_stat(int argc, const char **argv, int run_idx)
{
int interval = stat_config.interval;
int times = stat_config.times;
int timeout = stat_config.timeout;
char msg[BUFSIZ];
unsigned long long t0, t1;
struct evsel *counter;
size_t l;
int status = 0;
const bool forks = (argc > 0);
bool is_pipe = STAT_RECORD ? perf_stat.data.is_pipe : false;
struct affinity affinity;
int i, cpu;
bool second_pass = false;
if (forks) {
if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
workload_exec_failed_signal) < 0) {
perror("failed to prepare workload");
return -1;
}
child_pid = evsel_list->workload.pid;
}
if (group)
perf_evlist__set_leader(evsel_list);
if (affinity__setup(&affinity) < 0)
return -1;
evlist__for_each_cpu (evsel_list, i, cpu) {
affinity__set(&affinity, cpu);
evlist__for_each_entry(evsel_list, counter) {
if (evsel__cpu_iter_skip(counter, cpu))
continue;
if (counter->reset_group || counter->errored)
continue;
try_again:
if (create_perf_stat_counter(counter, &stat_config, &target,
counter->cpu_iter - 1) < 0) {
/*
* Weak group failed. We cannot just undo this here
* because earlier CPUs might be in group mode, and the kernel
* doesn't support mixing group and non group reads. Defer
* it to later.
* Don't close here because we're in the wrong affinity.
*/
if ((errno == EINVAL || errno == EBADF) &&
counter->leader != counter &&
counter->weak_group) {
perf_evlist__reset_weak_group(evsel_list, counter, false);
assert(counter->reset_group);
second_pass = true;
continue;
}
switch (stat_handle_error(counter)) {
case COUNTER_FATAL:
return -1;
case COUNTER_RETRY:
goto try_again;
case COUNTER_SKIP:
continue;
default:
break;
}
}
counter->supported = true;
}
}
if (second_pass) {
/*
* Now redo all the weak group after closing them,
* and also close errored counters.
*/
evlist__for_each_cpu(evsel_list, i, cpu) {
affinity__set(&affinity, cpu);
/* First close errored or weak retry */
evlist__for_each_entry(evsel_list, counter) {
if (!counter->reset_group && !counter->errored)
continue;
if (evsel__cpu_iter_skip_no_inc(counter, cpu))
continue;
perf_evsel__close_cpu(&counter->core, counter->cpu_iter);
}
/* Now reopen weak */
evlist__for_each_entry(evsel_list, counter) {
if (!counter->reset_group && !counter->errored)
continue;
if (evsel__cpu_iter_skip(counter, cpu))
continue;
if (!counter->reset_group)
continue;
try_again_reset:
pr_debug2("reopening weak %s\n", evsel__name(counter));
if (create_perf_stat_counter(counter, &stat_config, &target,
counter->cpu_iter - 1) < 0) {
switch (stat_handle_error(counter)) {
case COUNTER_FATAL:
return -1;
case COUNTER_RETRY:
goto try_again_reset;
case COUNTER_SKIP:
continue;
default:
break;
}
}
counter->supported = true;
}
}
}
affinity__cleanup(&affinity);
evlist__for_each_entry(evsel_list, counter) {
if (!counter->supported) {
perf_evsel__free_fd(&counter->core);
continue;
}
l = strlen(counter->unit);
if (l > stat_config.unit_width)
stat_config.unit_width = l;
if (evsel__should_store_id(counter) &&
evsel__store_ids(counter, evsel_list))
return -1;
}
if (perf_evlist__apply_filters(evsel_list, &counter)) {
pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
counter->filter, evsel__name(counter), errno,
str_error_r(errno, msg, sizeof(msg)));
return -1;
}
if (STAT_RECORD) {
int err, fd = perf_data__fd(&perf_stat.data);
if (is_pipe) {
err = perf_header__write_pipe(perf_data__fd(&perf_stat.data));
} else {
err = perf_session__write_header(perf_stat.session, evsel_list,
fd, false);
}
if (err < 0)
return err;
err = perf_event__synthesize_stat_events(&stat_config, NULL, evsel_list,
process_synthesized_event, is_pipe);
if (err < 0)
return err;
}
/*
* Enable counters and exec the command:
*/
t0 = rdclock();
clock_gettime(CLOCK_MONOTONIC, &ref_time);
if (forks) {
perf_evlist__start_workload(evsel_list);
enable_counters();
if (interval || timeout || evlist__ctlfd_initialized(evsel_list))
status = dispatch_events(forks, timeout, interval, ×);
if (child_pid != -1) {
if (timeout)
kill(child_pid, SIGTERM);
wait4(child_pid, &status, 0, &stat_config.ru_data);
}
if (workload_exec_errno) {
const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
pr_err("Workload failed: %s\n", emsg);
return -1;
}
if (WIFSIGNALED(status))
psignal(WTERMSIG(status), argv[0]);
} else {
enable_counters();
status = dispatch_events(forks, timeout, interval, ×);
}
disable_counters();
t1 = rdclock();
if (stat_config.walltime_run_table)
stat_config.walltime_run[run_idx] = t1 - t0;
if (interval) {
stat_config.interval = 0;
stat_config.summary = true;
init_stats(&walltime_nsecs_stats);
update_stats(&walltime_nsecs_stats, t1 - t0);
if (stat_config.aggr_mode == AGGR_GLOBAL)
perf_evlist__save_aggr_prev_raw_counts(evsel_list);
perf_evlist__copy_prev_raw_counts(evsel_list);
perf_evlist__reset_prev_raw_counts(evsel_list);
runtime_stat_reset(&stat_config);
perf_stat__reset_shadow_per_stat(&rt_stat);
} else
update_stats(&walltime_nsecs_stats, t1 - t0);
/*
* Closing a group leader splits the group, and as we only disable
* group leaders, results in remaining events becoming enabled. To
* avoid arbitrary skew, we must read all counters before closing any
* group leaders.
*/
read_counters(&(struct timespec) { .tv_nsec = t1-t0 });
/*
* We need to keep evsel_list alive, because it's processed
* later the evsel_list will be closed after.
*/
if (!STAT_RECORD)
evlist__close(evsel_list);
return WEXITSTATUS(status);
}
static int run_perf_stat(int argc, const char **argv, int run_idx)
{
int ret;
if (pre_cmd) {
ret = system(pre_cmd);
if (ret)
return ret;
}
if (sync_run)
sync();
ret = __run_perf_stat(argc, argv, run_idx);
if (ret)
return ret;
if (post_cmd) {
ret = system(post_cmd);
if (ret)
return ret;
}
return ret;
}
static void print_counters(struct timespec *ts, int argc, const char **argv)
{
/* Do not print anything if we record to the pipe. */
if (STAT_RECORD && perf_stat.data.is_pipe)
return;
perf_evlist__print_counters(evsel_list, &stat_config, &target,
ts, argc, argv);
}
static volatile int signr = -1;
static void skip_signal(int signo)
{
if ((child_pid == -1) || stat_config.interval)
done = 1;
signr = signo;
/*
* render child_pid harmless
* won't send SIGTERM to a random
* process in case of race condition
* and fast PID recycling
*/
child_pid = -1;
}
static void sig_atexit(void)
{
sigset_t set, oset;
/*
* avoid race condition with SIGCHLD handler
* in skip_signal() which is modifying child_pid
* goal is to avoid send SIGTERM to a random
* process
*/
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigprocmask(SIG_BLOCK, &set, &oset);