/*
* 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: 0.104
Performance counter stats for '/home/mingo/hackbench':
1255.538611 task clock ticks # 10.143 CPU utilization factor
54011 context switches # 0.043 M/sec
385 CPU migrations # 0.000 M/sec
17755 pagefaults # 0.014 M/sec
3808323185 CPU cycles # 3033.219 M/sec
1575111190 instructions # 1254.530 M/sec
17367895 cache references # 13.833 M/sec
7674421 cache misses # 6.112 M/sec
Wall-clock time elapsed: 123.786620 msecs
*
* 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>
* Jaswinder Singh Rajput <jaswinder@kernel.org>
*
* Released under the GPL v2. (and only v2, not any later version)
*/
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
#include <sys/prctl.h>
#include <math.h>
static struct perf_counter_attr default_attrs[] = {
{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES},
{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
};
#define MAX_RUN 100
static int system_wide = 0;
static int verbose = 0;
static int nr_cpus = 0;
static int run_idx = 0;
static int run_count = 1;
static int inherit = 1;
static int scale = 1;
static int target_pid = -1;
static int null_run = 0;
static int fd[MAX_NR_CPUS][MAX_COUNTERS];
static u64 runtime_nsecs[MAX_RUN];
static u64 walltime_nsecs[MAX_RUN];
static u64 runtime_cycles[MAX_RUN];
static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
static u64 event_res_avg[MAX_COUNTERS][3];
static u64 event_res_noise[MAX_COUNTERS][3];
static u64 event_scaled_avg[MAX_COUNTERS];
static u64 runtime_nsecs_avg;
static u64 runtime_nsecs_noise;
static u64 walltime_nsecs_avg;
static u64 walltime_nsecs_noise;
static u64 runtime_cycles_avg;
static u64 runtime_cycles_noise;
#define ERR_PERF_OPEN \
"Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n"
static void create_perf_stat_counter(int counter, int pid)
{
struct perf_counter_attr *attr = attrs + counter;
if (scale)
attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
PERF_FORMAT_TOTAL_TIME_RUNNING;
if (system_wide) {
int cpu;
for (cpu = 0; cpu < nr_cpus; cpu++) {
fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
if (fd[cpu][counter] < 0 && verbose)
fprintf(stderr, ERR_PERF_OPEN, counter,
fd[cpu][counter], strerror(errno));
}
} else {
attr->inherit = inherit;
attr->disabled = 1;
attr->enable_on_exec = 1;
fd[0][counter] = sys_perf_counter_open(attr, pid, -1, -1, 0);
if (fd[0][counter] < 0 && verbose)
fprintf(stderr, ERR_PERF_OPEN, counter,
fd[0][counter], strerror(errno));
}
}
/*
* Does the counter have nsecs as a unit?
*/
static inline int nsec_counter(int counter)
{
if (attrs[counter].type != PERF_TYPE_SOFTWARE)
return 0;
if (attrs[counter].config == PERF_COUNT_SW_CPU_CLOCK)
return 1;
if (attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK)
return 1;
return 0;
}
/*
* Read out the results of a single counter:
*/
static void read_counter(int counter)
{
u64 *count, single_count[3];
ssize_t res;
int cpu, nv;
int scaled;
count = event_res[run_idx][counter];
count[0] = count[1] = count[2] = 0;
nv = scale ? 3 : 1;
for (cpu = 0; cpu < nr_cpus; cpu++) {
if (fd[cpu][counter] < 0)
continue;
res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
assert(res == nv * sizeof(u64));
close(fd[cpu][counter]);
fd[cpu][counter] = -1;
count[0] += single_count[0];
if (scale) {
count[1] += single_count[1];
count[2] += single_count[2];
}
}
scaled = 0;
if (scale) {
if (count[2] == 0) {
event_scaled[run_idx][counter] = -1;
count[0] = 0;
return;
}
if (count[2] < count[1]) {
event_scaled[run_idx][counter] = 1;
count[0] = (unsigned long long)
((double)count[0] * count[1] / count[2] + 0.5);
}
}
/*
* Save the full runtime - to allow normalization during printout:
*/
if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK)
runtime_nsecs[run_idx] = count[0];
if (attrs[counter].type == PERF_TYPE_HARDWARE &&
attrs[counter].config == PERF_COUNT_HW_CPU_CYCLES)
runtime_cycles[run_idx] = count[0];
}
static int run_perf_stat(int argc, const char **argv)
{
unsigned long long t0, t1;
int status = 0;
int counter;
int pid;
int child_ready_pipe[2], go_pipe[2];
char buf;
if (!system_wide)
nr_cpus = 1;
if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
perror("failed to create pipes");
exit(1);
}
if ((pid = fork()) < 0)
perror("failed to fork");
if (!pid) {
close(child_ready_pipe[0]);
close(go_pipe[1]);
fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
/*
* Do a dummy execvp to get the PLT entry resolved,
* so we avoid the resolver overhead on the real
* execvp call.
*/
execvp("", (char **)argv);
/*
* Tell the parent we're ready to go
*/
close(child_ready_pipe[1]);
/*
* Wait until the parent tells us to go.
*/
read(go_pipe[0], &buf, 1);
execvp(argv[0], (char **)argv);
perror(argv[0]);
exit(-1);
}
/*
* Wait for the child to be ready to exec.
*/
close(child_ready_pipe[1]);
close(go_pipe[0]);
read(child_ready_pipe[0], &buf, 1);
close(child_ready_pipe[0]);
for (counter = 0; counter < nr_counters; counter++)
create_perf_stat_counter(counter, pid);
/*
* Enable counters and exec the command:
*/
t0 = rdclock();
close(go_pipe[1]);
wait(&status);
t1 = rdclock();
walltime_nsecs[run_idx] = t1 - t0;
for (counter = 0; counter < nr_counters; counter++)
read_counter(counter);
return WEXITSTATUS(status);
}
static void print_noise(u64 *count, u64 *noise)
{
if (run_count > 1)
fprintf(stderr, " ( +- %7.3f%% )",
(double)noise[0]/(count[0]+1)*100.0);
}
static void nsec_printout(int counter, u64 *count, u64 *noise)
{
double msecs = (double)count[0] / 1000000;
fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK) {
if (walltime_nsecs_avg)
fprintf(stderr, " # %10.3f CPUs ",
(double)count[0] / (double)walltime_nsecs_avg);
}
print_noise(count, noise);
}
static void abs_printout(int counter, u64 *count, u64 *noise)
{
fprintf(stderr, " %14Ld %-24s", count[0], event_name(counter));
if (runtime_cycles_avg &&
attrs[counter].type == PERF_TYPE_HARDWARE &&
attrs[counter].config == PERF_COUNT_HW_INSTRUCTIONS) {
fprintf(stderr, " # %10.3f IPC ",
(double)count[0] / (double)runtime_cycles_avg);
} else {
if (runtime_nsecs_avg) {
fprintf(stderr, " # %10.3f M/sec",
(double)count[0]/runtime_nsecs_avg*1000.0);
}
}
print_noise(count, noise);
}
/*
* Print out the results of a single counter:
*/
static void print_counter(int counter)
{
u64 *count, *noise;
int scaled;
count = event_res_avg[counter];
noise = event_res_noise[counter];
scaled = event_scaled_avg[counter];
if (scaled == -1) {
fprintf(stderr, " %14s %-24s\n",
"<not counted>", event_name(counter));
return;
}
if (nsec_counter(counter))
nsec_printout(counter, count, noise);
else
abs_printout(counter, count, noise);
if (scaled)
fprintf(stderr, " (scaled from %.2f%%)",
(double) count[2] / count[1] * 100);
fprintf(stderr, "\n");
}
/*
* normalize_noise noise values down to stddev:
*/
static void normalize_noise(u64 *val)
{
double res;
res = (double)*val / (run_count * sqrt((double)run_count));
*val = (u64)res;
}
static void update_avg(const char *name, int idx, u64 *avg, u64 *val)
{
*avg += *val;
if (verbose > 1)
fprintf(stderr, "debug: %20s[%d]: %Ld\n", name, idx, *val);
}
/*
* Calculate the averages and noises:
*/
static void calc_avg(void)
{
int i, j;
if (verbose > 1)
fprintf(stderr, "\n");
for (i = 0; i < run_count; i++) {
update_avg("runtime", 0, &runtime_nsecs_avg, runtime_nsecs + i);
update_avg("walltime", 0, &walltime_nsecs_avg, walltime_nsecs + i);
update_avg("runtime_cycles", 0, &runtime_cycles_avg, runtime_cycles + i);
for (j = 0; j < nr_counters; j++) {
update_avg("counter/0", j,
event_res_avg[j]+0, event_res[i][j]+0);
update_avg("counter/1", j,
event_res_avg[j]+1, event_res[i][j]+1);
update_avg("counter/2", j,
event_res_avg[j]+2, event_res[i][j]+2);
if (event_scaled[i][j] != -1)
update_avg("scaled", j,
event_scaled_avg + j, event_scaled[i]+j);
else
event_scaled_avg[j] = -1;
}
}
runtime_nsecs_avg /= run_count;
walltime_nsecs_avg /= run_count;
runtime_cycles_avg /= run_count;
for (j = 0; j < nr_counters; j++) {
event_res_avg[j][0] /= run_count;
event_res_avg[j][1] /= run_count;
event_res_avg[j][2] /= run_count;
}
for (i = 0; i < run_count; i++) {
runtime_nsecs_noise +=
abs((s64)(runtime_nsecs[i] - runtime_nsecs_avg));
walltime_nsecs_noise +=
abs((s64)(walltime_nsecs[i] - walltime_nsecs_avg));
runtime_cycles_noise +=
abs((s64)(runtime_cycles[i] - runtime_cycles_avg));
for (j = 0; j < nr_counters; j++) {
event_res_noise[j][0] +=
abs((s64)(event_res[i][j][0] - event_res_avg[j][0]));
event_res_noise[j][1] +=
abs((s64)(event_res[i][j][1] - event_res_avg[j][1]));
event_res_noise[j][2] +=
abs((s64)(event_res[i][j][2] - event_res_avg[j][2]));
}
}
normalize_noise(&runtime_nsecs_noise);
normalize_noise(&walltime_nsecs_noise);
normalize_noise(&runtime_cycles_noise);
for (j = 0; j < nr_counters; j++) {
normalize_noise(&event_res_noise[j][0]);
normalize_noise(&event_res_noise[j][1]);
normalize_noise(&event_res_noise[j][2]);
}
}
static void print_stat(int argc, const char **argv)
{
int i, counter;
calc_avg();
fflush(stdout);
fprintf(stderr, "\n");
fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
for (i = 1; i < argc; i++)
fprintf(stderr, " %s", argv[i]);
fprintf(stderr, "\'");
if (run_count > 1)
fprintf(stderr, " (%d runs)", run_count);
fprintf(stderr, ":\n\n");
for (counter = 0; counter < nr_counters; counter++)
print_counter(counter);
fprintf(stderr, "\n");
fprintf(stderr, " %14.9f seconds time elapsed",
(double)walltime_nsecs_avg/1e9);
if (run_count > 1) {
fprintf(stderr, " ( +- %7.3f%% )",
100.0*(double)walltime_nsecs_noise/(double)walltime_nsecs_avg);
}
fprintf(stderr, "\n\n");
}
static volatile int signr = -1;
static void skip_signal(int signo)
{
signr = signo;
}
static void sig_atexit(void)
{
if (signr == -1)
return;
signal(signr, SIG_DFL);
kill(getpid(), signr);
}
static const char * const stat_usage[] = {
"perf stat [<options>] <command>",
NULL
};
static const struct option options[] = {
OPT_CALLBACK('e', "event", NULL, "event",
"event selector. use 'perf list' to list available events",
parse_events),
OPT_BOOLEAN('i', "inherit", &inherit,
"child tasks inherit counters"),
OPT_INTEGER('p', "pid", &target_pid,
"stat events on existing pid"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
OPT_BOOLEAN('S', "scale", &scale,
"scale/normalize counters"),
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_INTEGER('r', "repeat", &run_count,
"repeat command and print average + stddev (max: 100)"),
OPT_BOOLEAN('n', "null", &null_run,
"null run - dont start any counters"),
OPT_END()
};
int cmd_stat(int argc, const char **argv, const char *prefix)
{
int status;
argc = parse_options(argc, argv, options, stat_usage, 0);
if (!argc)
usage_with_options(stat_usage, options);
if (run_count <= 0 || run_count > MAX_RUN)
usage_with_options(stat_usage, options);
/* Set attrs and nr_counters if no event is selected and !null_run */
if (!null_run && !nr_counters) {
memcpy(attrs, default_attrs, sizeof(default_attrs));
nr_counters = ARRAY_SIZE(default_attrs);
}
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
assert(nr_cpus <= MAX_NR_CPUS);
assert(nr_cpus >= 0);
/*
* We dont want to block the signals - that would cause
* child tasks to inherit that and Ctrl-C would not work.
* What we want is for Ctrl-C to work in the exec()-ed
* task, but being ignored by perf stat itself:
*/
atexit(sig_atexit);
signal(SIGINT, skip_signal);
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);
status = 0;
for (run_idx = 0; run_idx < run_count; run_idx++) {
if (run_count != 1 && verbose)
fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
status = run_perf_stat(argc, argv);
}
print_stat(argc, argv);
return status;
}
