[deliverable/linux.git] / tools / perf / builtin-stat.c

/*
 * 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;

		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();
	prctl(PR_TASK_PERF_COUNTERS_ENABLE);

	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;
}
Commit	Line	Data
ddcacfa0	1	/*
bf9e1876 IM	2	* builtin-stat.c
	3	*
	4	* Builtin stat command: Give a precise performance counters summary
	5	* overview about any workload, CPU or specific PID.
	6	*
	7	* Sample output:
ddcacfa0	8
bf9e1876 IM	9	$ perf stat ~/hackbench 10
bf9e1876 IM	10	Time: 0.104
ddcacfa0	11
bf9e1876	12	Performance counter stats for '/home/mingo/hackbench':
ddcacfa0	13
bf9e1876 IM	14	1255.538611 task clock ticks # 10.143 CPU utilization factor
	15	54011 context switches # 0.043 M/sec
	16	385 CPU migrations # 0.000 M/sec
	17	17755 pagefaults # 0.014 M/sec
	18	3808323185 CPU cycles # 3033.219 M/sec
	19	1575111190 instructions # 1254.530 M/sec
	20	17367895 cache references # 13.833 M/sec
	21	7674421 cache misses # 6.112 M/sec
ddcacfa0	22
bf9e1876	23	Wall-clock time elapsed: 123.786620 msecs
ddcacfa0	24
5242519b IM	25	*
	26	* Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
	27	*
	28	* Improvements and fixes by:
	29	*
	30	* Arjan van de Ven <arjan@linux.intel.com>
	31	* Yanmin Zhang <yanmin.zhang@intel.com>
	32	* Wu Fengguang <fengguang.wu@intel.com>
	33	* Mike Galbraith <efault@gmx.de>
	34	* Paul Mackerras <paulus@samba.org>
6e750a8f	35	* Jaswinder Singh Rajput <jaswinder@kernel.org>
5242519b IM	36	*
5242519b IM	37	* Released under the GPL v2. (and only v2, not any later version)
ddcacfa0 IM	38	*/
ddcacfa0 IM	39
1a482f38	40	#include "perf.h"
16f762a2	41	#include "builtin.h"
148be2c1	42	#include "util/util.h"
5242519b IM	43	#include "util/parse-options.h"
5242519b IM	44	#include "util/parse-events.h"
ddcacfa0	45
ddcacfa0	46	#include <sys/prctl.h>
42202dd5	47	#include <math.h>
16c8a109	48
c3043569	49	static struct perf_counter_attr default_attrs[] = {
ddcacfa0	50
f4dbfa8f PZ	51	{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
	52	{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES},
	53	{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
	54	{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
	55
	56	{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
	57	{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
	58	{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
	59	{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
	60
ddcacfa0	61	};
5242519b	62
3d632595 JSR	63	#define MAX_RUN 100
3d632595 JSR	64
a21ca2ca	65	static int system_wide = 0;
743ee1f8	66	static int verbose = 0;
ddcacfa0	67	static int nr_cpus = 0;
3d632595	68	static int run_idx = 0;
ddcacfa0	69
3d632595 JSR	70	static int run_count = 1;
3d632595 JSR	71	static int inherit = 1;
66cf7829	72	static int scale = 1;
3d632595	73	static int target_pid = -1;
0cfb7a13	74	static int null_run = 0;
ddcacfa0	75
3d632595	76	static int fd[MAX_NR_CPUS][MAX_COUNTERS];
42202dd5	77
9cffa8d5 PM	78	static u64 runtime_nsecs[MAX_RUN];
	79	static u64 walltime_nsecs[MAX_RUN];
	80	static u64 runtime_cycles[MAX_RUN];
42202dd5	81
3d632595 JSR	82	static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
	83	static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
	84
9cffa8d5 PM	85	static u64 event_res_avg[MAX_COUNTERS][3];
9cffa8d5 PM	86	static u64 event_res_noise[MAX_COUNTERS][3];
42202dd5	87
9cffa8d5	88	static u64 event_scaled_avg[MAX_COUNTERS];
42202dd5	89
9cffa8d5 PM	90	static u64 runtime_nsecs_avg;
9cffa8d5 PM	91	static u64 runtime_nsecs_noise;
42202dd5	92
9cffa8d5 PM	93	static u64 walltime_nsecs_avg;
9cffa8d5 PM	94	static u64 walltime_nsecs_noise;
42202dd5	95
9cffa8d5 PM	96	static u64 runtime_cycles_avg;
9cffa8d5 PM	97	static u64 runtime_cycles_noise;
be1ac0d8	98
cca03c0a JSR	99	#define ERR_PERF_OPEN \
	100	"Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n"
	101
051ae7f7	102	static void create_perf_stat_counter(int counter, int pid)
ddcacfa0	103	{
a21ca2ca	104	struct perf_counter_attr *attr = attrs + counter;
16c8a109	105
ddcacfa0	106	if (scale)
a21ca2ca IM	107	attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED \|
a21ca2ca IM	108	PERF_FORMAT_TOTAL_TIME_RUNNING;
ddcacfa0 IM	109
	110	if (system_wide) {
	111	int cpu;
cca03c0a	112	for (cpu = 0; cpu < nr_cpus; cpu++) {
a21ca2ca	113	fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
cca03c0a JSR	114	if (fd[cpu][counter] < 0 && verbose)
	115	fprintf(stderr, ERR_PERF_OPEN, counter,
	116	fd[cpu][counter], strerror(errno));
ddcacfa0 IM	117	}
ddcacfa0 IM	118	} else {
a21ca2ca IM	119	attr->inherit = inherit;
a21ca2ca IM	120	attr->disabled = 1;
ddcacfa0	121
051ae7f7	122	fd[0][counter] = sys_perf_counter_open(attr, pid, -1, -1, 0);
cca03c0a JSR	123	if (fd[0][counter] < 0 && verbose)
	124	fprintf(stderr, ERR_PERF_OPEN, counter,
	125	fd[0][counter], strerror(errno));
ddcacfa0 IM	126	}
	127	}
	128
c04f5e5d IM	129	/*
	130	* Does the counter have nsecs as a unit?
	131	*/
	132	static inline int nsec_counter(int counter)
	133	{
a21ca2ca IM	134	if (attrs[counter].type != PERF_TYPE_SOFTWARE)
	135	return 0;
	136
f4dbfa8f	137	if (attrs[counter].config == PERF_COUNT_SW_CPU_CLOCK)
c04f5e5d	138	return 1;
a21ca2ca	139
f4dbfa8f	140	if (attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK)
c04f5e5d IM	141	return 1;
	142
	143	return 0;
	144	}
	145
	146	/*
2996f5dd	147	* Read out the results of a single counter:
c04f5e5d	148	*/
2996f5dd	149	static void read_counter(int counter)
c04f5e5d	150	{
9cffa8d5	151	u64 *count, single_count[3];
c04f5e5d IM	152	ssize_t res;
	153	int cpu, nv;
	154	int scaled;
	155
42202dd5	156	count = event_res[run_idx][counter];
2996f5dd	157
c04f5e5d	158	count[0] = count[1] = count[2] = 0;
2996f5dd	159
c04f5e5d	160	nv = scale ? 3 : 1;
cca03c0a	161	for (cpu = 0; cpu < nr_cpus; cpu++) {
743ee1f8 IM	162	if (fd[cpu][counter] < 0)
	163	continue;
	164
9cffa8d5 PM	165	res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
9cffa8d5 PM	166	assert(res == nv * sizeof(u64));
42202dd5 IM	167	close(fd[cpu][counter]);
42202dd5 IM	168	fd[cpu][counter] = -1;
c04f5e5d IM	169
	170	count[0] += single_count[0];
	171	if (scale) {
	172	count[1] += single_count[1];
	173	count[2] += single_count[2];
	174	}
	175	}
	176
	177	scaled = 0;
	178	if (scale) {
	179	if (count[2] == 0) {
42202dd5	180	event_scaled[run_idx][counter] = -1;
2996f5dd	181	count[0] = 0;
c04f5e5d IM	182	return;
c04f5e5d IM	183	}
2996f5dd	184
c04f5e5d	185	if (count[2] < count[1]) {
42202dd5	186	event_scaled[run_idx][counter] = 1;
c04f5e5d IM	187	count[0] = (unsigned long long)
	188	((double)count[0] * count[1] / count[2] + 0.5);
	189	}
	190	}
be1ac0d8 IM	191	/*
	192	* Save the full runtime - to allow normalization during printout:
	193	*/
a21ca2ca	194	if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
f4dbfa8f	195	attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK)
42202dd5	196	runtime_nsecs[run_idx] = count[0];
e779898a	197	if (attrs[counter].type == PERF_TYPE_HARDWARE &&
f4dbfa8f	198	attrs[counter].config == PERF_COUNT_HW_CPU_CYCLES)
42202dd5	199	runtime_cycles[run_idx] = count[0];
2996f5dd IM	200	}
2996f5dd IM	201
42202dd5 IM	202	static int run_perf_stat(int argc, const char **argv)
	203	{
	204	unsigned long long t0, t1;
	205	int status = 0;
	206	int counter;
	207	int pid;
051ae7f7 PM	208	int child_ready_pipe[2], go_pipe[2];
051ae7f7 PM	209	char buf;
42202dd5 IM	210
	211	if (!system_wide)
	212	nr_cpus = 1;
	213
051ae7f7 PM	214	if (pipe(child_ready_pipe) < 0 \|\| pipe(go_pipe) < 0) {
	215	perror("failed to create pipes");
	216	exit(1);
	217	}
	218
	219	if ((pid = fork()) < 0)
	220	perror("failed to fork");
	221
	222	if (!pid) {
	223	close(child_ready_pipe[0]);
	224	close(go_pipe[1]);
	225	fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
	226
	227	/*
	228	* Do a dummy execvp to get the PLT entry resolved,
	229	* so we avoid the resolver overhead on the real
	230	* execvp call.
	231	*/
	232	execvp("", (char **)argv);
	233
	234	/*
	235	* Tell the parent we're ready to go
	236	*/
	237	close(child_ready_pipe[1]);
	238
	239	/*
	240	* Wait until the parent tells us to go.
	241	*/
	242	read(go_pipe[0], &buf, 1);
	243
	244	execvp(argv[0], (char **)argv);
	245
	246	perror(argv[0]);
	247	exit(-1);
	248	}
	249
	250	/*
	251	* Wait for the child to be ready to exec.
	252	*/
	253	close(child_ready_pipe[1]);
	254	close(go_pipe[0]);
	255	read(child_ready_pipe[0], &buf, 1);
	256	close(child_ready_pipe[0]);
	257
42202dd5	258	for (counter = 0; counter < nr_counters; counter++)
051ae7f7	259	create_perf_stat_counter(counter, pid);
42202dd5 IM	260
	261	/*
	262	* Enable counters and exec the command:
	263	*/
	264	t0 = rdclock();
	265	prctl(PR_TASK_PERF_COUNTERS_ENABLE);
	266
051ae7f7	267	close(go_pipe[1]);
42202dd5 IM	268	wait(&status);
42202dd5 IM	269
42202dd5 IM	270	t1 = rdclock();
	271
	272	walltime_nsecs[run_idx] = t1 - t0;
	273
	274	for (counter = 0; counter < nr_counters; counter++)
	275	read_counter(counter);
	276
	277	return WEXITSTATUS(status);
	278	}
	279
9cffa8d5	280	static void print_noise(u64 count, u64 noise)
42202dd5 IM	281	{
	282	if (run_count > 1)
	283	fprintf(stderr, " ( +- %7.3f%% )",
	284	(double)noise[0]/(count[0]+1)*100.0);
	285	}
	286
9cffa8d5	287	static void nsec_printout(int counter, u64 count, u64 noise)
44175b6f IM	288	{
	289	double msecs = (double)count[0] / 1000000;
	290
6e750a8f	291	fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
44175b6f IM	292
	293	if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
	294	attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK) {
	295
42202dd5 IM	296	if (walltime_nsecs_avg)
	297	fprintf(stderr, " # %10.3f CPUs ",
	298	(double)count[0] / (double)walltime_nsecs_avg);
44175b6f	299	}
42202dd5	300	print_noise(count, noise);
44175b6f IM	301	}
44175b6f IM	302
9cffa8d5	303	static void abs_printout(int counter, u64 count, u64 noise)
44175b6f	304	{
6e750a8f	305	fprintf(stderr, " %14Ld %-24s", count[0], event_name(counter));
44175b6f	306
42202dd5	307	if (runtime_cycles_avg &&
44175b6f IM	308	attrs[counter].type == PERF_TYPE_HARDWARE &&
	309	attrs[counter].config == PERF_COUNT_HW_INSTRUCTIONS) {
	310
42202dd5 IM	311	fprintf(stderr, " # %10.3f IPC ",
	312	(double)count[0] / (double)runtime_cycles_avg);
	313	} else {
	314	if (runtime_nsecs_avg) {
	315	fprintf(stderr, " # %10.3f M/sec",
	316	(double)count[0]/runtime_nsecs_avg*1000.0);
	317	}
44175b6f	318	}
42202dd5	319	print_noise(count, noise);
44175b6f IM	320	}
44175b6f IM	321
2996f5dd IM	322	/*
	323	* Print out the results of a single counter:
	324	*/
	325	static void print_counter(int counter)
	326	{
9cffa8d5	327	u64 count, noise;
2996f5dd IM	328	int scaled;
2996f5dd IM	329
42202dd5 IM	330	count = event_res_avg[counter];
	331	noise = event_res_noise[counter];
	332	scaled = event_scaled_avg[counter];
2996f5dd IM	333
2996f5dd IM	334	if (scaled == -1) {
6e750a8f	335	fprintf(stderr, " %14s %-24s\n",
2996f5dd IM	336	"<not counted>", event_name(counter));
	337	return;
	338	}
c04f5e5d	339
44175b6f	340	if (nsec_counter(counter))
42202dd5	341	nsec_printout(counter, count, noise);
44175b6f	342	else
42202dd5	343	abs_printout(counter, count, noise);
d7c29318	344
c04f5e5d	345	if (scaled)
210ad39f IM	346	fprintf(stderr, " (scaled from %.2f%%)",
210ad39f IM	347	(double) count[2] / count[1] * 100);
44175b6f	348
c04f5e5d IM	349	fprintf(stderr, "\n");
	350	}
	351
42202dd5	352	/*
ef281a19	353	* normalize_noise noise values down to stddev:
42202dd5	354	*/
9cffa8d5	355	static void normalize_noise(u64 *val)
ddcacfa0	356	{
42202dd5	357	double res;
ddcacfa0	358
42202dd5	359	res = (double)val / (run_count sqrt((double)run_count));
ddcacfa0	360
9cffa8d5	361	*val = (u64)res;
42202dd5	362	}
ddcacfa0	363
9cffa8d5	364	static void update_avg(const char name, int idx, u64 avg, u64 *val)
ef281a19 IM	365	{
	366	avg += val;
	367
	368	if (verbose > 1)
	369	fprintf(stderr, "debug: %20s[%d]: %Ld\n", name, idx, *val);
	370	}
42202dd5 IM	371	/*
	372	* Calculate the averages and noises:
	373	*/
	374	static void calc_avg(void)
	375	{
	376	int i, j;
	377
ef281a19 IM	378	if (verbose > 1)
	379	fprintf(stderr, "\n");
	380
42202dd5	381	for (i = 0; i < run_count; i++) {
ef281a19 IM	382	update_avg("runtime", 0, &runtime_nsecs_avg, runtime_nsecs + i);
	383	update_avg("walltime", 0, &walltime_nsecs_avg, walltime_nsecs + i);
	384	update_avg("runtime_cycles", 0, &runtime_cycles_avg, runtime_cycles + i);
42202dd5 IM	385
42202dd5 IM	386	for (j = 0; j < nr_counters; j++) {
ef281a19 IM	387	update_avg("counter/0", j,
	388	event_res_avg[j]+0, event_res[i][j]+0);
	389	update_avg("counter/1", j,
	390	event_res_avg[j]+1, event_res[i][j]+1);
	391	update_avg("counter/2", j,
	392	event_res_avg[j]+2, event_res[i][j]+2);
566747e6 IM	393	if (event_scaled[i][j] != -1)
	394	update_avg("scaled", j,
	395	event_scaled_avg + j, event_scaled[i]+j);
	396	else
	397	event_scaled_avg[j] = -1;
42202dd5 IM	398	}
	399	}
	400	runtime_nsecs_avg /= run_count;
	401	walltime_nsecs_avg /= run_count;
	402	runtime_cycles_avg /= run_count;
	403
	404	for (j = 0; j < nr_counters; j++) {
	405	event_res_avg[j][0] /= run_count;
	406	event_res_avg[j][1] /= run_count;
	407	event_res_avg[j][2] /= run_count;
	408	}
44db76c8	409
42202dd5 IM	410	for (i = 0; i < run_count; i++) {
42202dd5 IM	411	runtime_nsecs_noise +=
9cffa8d5	412	abs((s64)(runtime_nsecs[i] - runtime_nsecs_avg));
42202dd5	413	walltime_nsecs_noise +=
9cffa8d5	414	abs((s64)(walltime_nsecs[i] - walltime_nsecs_avg));
42202dd5	415	runtime_cycles_noise +=
9cffa8d5	416	abs((s64)(runtime_cycles[i] - runtime_cycles_avg));
42202dd5 IM	417
	418	for (j = 0; j < nr_counters; j++) {
	419	event_res_noise[j][0] +=
9cffa8d5	420	abs((s64)(event_res[i][j][0] - event_res_avg[j][0]));
42202dd5	421	event_res_noise[j][1] +=
9cffa8d5	422	abs((s64)(event_res[i][j][1] - event_res_avg[j][1]));
42202dd5	423	event_res_noise[j][2] +=
9cffa8d5	424	abs((s64)(event_res[i][j][2] - event_res_avg[j][2]));
ddcacfa0 IM	425	}
ddcacfa0 IM	426	}
44db76c8	427
ef281a19 IM	428	normalize_noise(&runtime_nsecs_noise);
	429	normalize_noise(&walltime_nsecs_noise);
	430	normalize_noise(&runtime_cycles_noise);
44db76c8	431
42202dd5	432	for (j = 0; j < nr_counters; j++) {
ef281a19 IM	433	normalize_noise(&event_res_noise[j][0]);
	434	normalize_noise(&event_res_noise[j][1]);
	435	normalize_noise(&event_res_noise[j][2]);
42202dd5 IM	436	}
	437	}
	438
	439	static void print_stat(int argc, const char **argv)
	440	{
	441	int i, counter;
	442
	443	calc_avg();
ddcacfa0 IM	444
	445	fflush(stdout);
	446
	447	fprintf(stderr, "\n");
44db76c8 IM	448	fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
	449
	450	for (i = 1; i < argc; i++)
	451	fprintf(stderr, " %s", argv[i]);
	452
42202dd5 IM	453	fprintf(stderr, "\'");
	454	if (run_count > 1)
	455	fprintf(stderr, " (%d runs)", run_count);
	456	fprintf(stderr, ":\n\n");
2996f5dd	457
c04f5e5d IM	458	for (counter = 0; counter < nr_counters; counter++)
c04f5e5d IM	459	print_counter(counter);
ddcacfa0	460
ddcacfa0	461	fprintf(stderr, "\n");
566747e6	462	fprintf(stderr, " %14.9f seconds time elapsed",
42202dd5	463	(double)walltime_nsecs_avg/1e9);
566747e6 IM	464	if (run_count > 1) {
	465	fprintf(stderr, " ( +- %7.3f%% )",
	466	100.0*(double)walltime_nsecs_noise/(double)walltime_nsecs_avg);
	467	}
	468	fprintf(stderr, "\n\n");
ddcacfa0 IM	469	}
ddcacfa0 IM	470
f7b7c26e PZ	471	static volatile int signr = -1;
f7b7c26e PZ	472
5242519b	473	static void skip_signal(int signo)
ddcacfa0	474	{
f7b7c26e PZ	475	signr = signo;
	476	}
	477
	478	static void sig_atexit(void)
	479	{
	480	if (signr == -1)
	481	return;
	482
	483	signal(signr, SIG_DFL);
	484	kill(getpid(), signr);
5242519b IM	485	}
	486
	487	static const char * const stat_usage[] = {
	488	"perf stat [<options>] <command>",
	489	NULL
	490	};
	491
5242519b IM	492	static const struct option options[] = {
5242519b IM	493	OPT_CALLBACK('e', "event", NULL, "event",
86847b62 TG	494	"event selector. use 'perf list' to list available events",
86847b62 TG	495	parse_events),
5242519b IM	496	OPT_BOOLEAN('i', "inherit", &inherit,
	497	"child tasks inherit counters"),
	498	OPT_INTEGER('p', "pid", &target_pid,
	499	"stat events on existing pid"),
	500	OPT_BOOLEAN('a', "all-cpus", &system_wide,
3d632595	501	"system-wide collection from all CPUs"),
86847b62	502	OPT_BOOLEAN('S', "scale", &scale,
3d632595	503	"scale/normalize counters"),
743ee1f8 IM	504	OPT_BOOLEAN('v', "verbose", &verbose,
743ee1f8 IM	505	"be more verbose (show counter open errors, etc)"),
42202dd5 IM	506	OPT_INTEGER('r', "repeat", &run_count,
42202dd5 IM	507	"repeat command and print average + stddev (max: 100)"),
0cfb7a13 IM	508	OPT_BOOLEAN('n', "null", &null_run,
0cfb7a13 IM	509	"null run - dont start any counters"),
5242519b IM	510	OPT_END()
	511	};
	512
	513	int cmd_stat(int argc, const char *argv, const char prefix)
	514	{
42202dd5 IM	515	int status;
42202dd5 IM	516
5242519b IM	517	argc = parse_options(argc, argv, options, stat_usage, 0);
	518	if (!argc)
	519	usage_with_options(stat_usage, options);
42202dd5 IM	520	if (run_count <= 0 \|\| run_count > MAX_RUN)
42202dd5 IM	521	usage_with_options(stat_usage, options);
ddcacfa0	522
c3043569 JSR	523	/* Set attrs and nr_counters if no event is selected and !null_run */
	524	if (!null_run && !nr_counters) {
	525	memcpy(attrs, default_attrs, sizeof(default_attrs));
	526	nr_counters = ARRAY_SIZE(default_attrs);
	527	}
ddcacfa0	528
ddcacfa0 IM	529	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
	530	assert(nr_cpus <= MAX_NR_CPUS);
	531	assert(nr_cpus >= 0);
	532
58d7e993 IM	533	/*
	534	* We dont want to block the signals - that would cause
	535	* child tasks to inherit that and Ctrl-C would not work.
	536	* What we want is for Ctrl-C to work in the exec()-ed
	537	* task, but being ignored by perf stat itself:
	538	*/
f7b7c26e	539	atexit(sig_atexit);
58d7e993 IM	540	signal(SIGINT, skip_signal);
	541	signal(SIGALRM, skip_signal);
	542	signal(SIGABRT, skip_signal);
	543
42202dd5 IM	544	status = 0;
	545	for (run_idx = 0; run_idx < run_count; run_idx++) {
	546	if (run_count != 1 && verbose)
3d632595	547	fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
42202dd5 IM	548	status = run_perf_stat(argc, argv);
	549	}
	550
	551	print_stat(argc, argv);
	552
	553	return status;
ddcacfa0	554	}