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-rw-r--r--tools/perf/builtin-stat.c521
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diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
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+/*
+ * 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>
+ *
+ * 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[MAX_COUNTERS] = {
+
+ { .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 },
+
+};
+
+static int system_wide = 0;
+static int inherit = 1;
+static int verbose = 0;
+
+static int fd[MAX_NR_CPUS][MAX_COUNTERS];
+
+static int target_pid = -1;
+static int nr_cpus = 0;
+static unsigned int page_size;
+
+static int scale = 1;
+
+static const unsigned int default_count[] = {
+ 1000000,
+ 1000000,
+ 10000,
+ 10000,
+ 1000000,
+ 10000,
+};
+
+#define MAX_RUN 100
+
+static int run_count = 1;
+static int run_idx = 0;
+
+static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
+static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
+
+//static u64 event_hist[MAX_RUN][MAX_COUNTERS][3];
+
+
+static u64 runtime_nsecs[MAX_RUN];
+static u64 walltime_nsecs[MAX_RUN];
+static u64 runtime_cycles[MAX_RUN];
+
+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;
+
+static void create_perf_stat_counter(int counter)
+{
+ 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) {
+ printf("Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n", counter, fd[cpu][counter], strerror(errno));
+ }
+ }
+ } else {
+ attr->inherit = inherit;
+ attr->disabled = 1;
+
+ fd[0][counter] = sys_perf_counter_open(attr, 0, -1, -1, 0);
+ if (fd[0][counter] < 0 && verbose) {
+ printf("Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n", 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;
+
+ if (!system_wide)
+ nr_cpus = 1;
+
+ for (counter = 0; counter < nr_counters; counter++)
+ create_perf_stat_counter(counter);
+
+ /*
+ * Enable counters and exec the command:
+ */
+ t0 = rdclock();
+ prctl(PR_TASK_PERF_COUNTERS_ENABLE);
+
+ if ((pid = fork()) < 0)
+ perror("failed to fork");
+
+ if (!pid) {
+ if (execvp(argv[0], (char **)argv)) {
+ perror(argv[0]);
+ exit(-1);
+ }
+ }
+
+ wait(&status);
+
+ prctl(PR_TASK_PERF_COUNTERS_DISABLE);
+ 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 %-20s", 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 %-20s", 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 %-20s\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);
+ update_avg("scaled", j,
+ event_scaled_avg + j, event_scaled[i]+j);
+ }
+ }
+ 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.\n",
+ (double)walltime_nsecs_avg/1e9);
+ fprintf(stderr, "\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_END()
+};
+
+int cmd_stat(int argc, const char **argv, const char *prefix)
+{
+ int status;
+
+ page_size = sysconf(_SC_PAGE_SIZE);
+
+ memcpy(attrs, default_attrs, sizeof(attrs));
+
+ 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);
+
+ if (!nr_counters)
+ nr_counters = 8;
+
+ 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;
+}
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