354 lines
8.5 KiB
C
354 lines
8.5 KiB
C
/*
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* builtin-stat.c
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*
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* Builtin stat command: Give a precise performance counters summary
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* overview about any workload, CPU or specific PID.
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*
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* Sample output:
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$ perf stat ~/hackbench 10
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Time: 0.104
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Performance counter stats for '/home/mingo/hackbench':
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1255.538611 task clock ticks # 10.143 CPU utilization factor
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54011 context switches # 0.043 M/sec
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385 CPU migrations # 0.000 M/sec
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17755 pagefaults # 0.014 M/sec
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3808323185 CPU cycles # 3033.219 M/sec
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1575111190 instructions # 1254.530 M/sec
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17367895 cache references # 13.833 M/sec
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7674421 cache misses # 6.112 M/sec
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Wall-clock time elapsed: 123.786620 msecs
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*
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* Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
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*
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* Improvements and fixes by:
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*
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* Arjan van de Ven <arjan@linux.intel.com>
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* Yanmin Zhang <yanmin.zhang@intel.com>
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* Wu Fengguang <fengguang.wu@intel.com>
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* Mike Galbraith <efault@gmx.de>
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* Paul Mackerras <paulus@samba.org>
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include "perf.h"
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#include "builtin.h"
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#include "util/util.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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#include <sys/prctl.h>
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static struct perf_counter_attr default_attrs[MAX_COUNTERS] = {
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{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_TASK_CLOCK },
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{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_CONTEXT_SWITCHES },
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{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_CPU_MIGRATIONS },
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{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_PAGE_FAULTS },
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{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_CPU_CYCLES },
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{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_INSTRUCTIONS },
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{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_CACHE_REFERENCES },
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{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_CACHE_MISSES },
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};
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static int system_wide = 0;
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static int inherit = 1;
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static int verbose = 0;
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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static int target_pid = -1;
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static int nr_cpus = 0;
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static unsigned int page_size;
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static int scale = 1;
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static const unsigned int default_count[] = {
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1000000,
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1000000,
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10000,
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10000,
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1000000,
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10000,
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};
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static __u64 event_res[MAX_COUNTERS][3];
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static __u64 event_scaled[MAX_COUNTERS];
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static __u64 runtime_nsecs;
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static __u64 walltime_nsecs;
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static __u64 runtime_cycles;
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static void create_perf_stat_counter(int counter)
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{
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struct perf_counter_attr *attr = attrs + counter;
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if (scale)
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attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
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PERF_FORMAT_TOTAL_TIME_RUNNING;
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if (system_wide) {
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int cpu;
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for (cpu = 0; cpu < nr_cpus; cpu ++) {
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fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
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if (fd[cpu][counter] < 0 && verbose) {
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printf("Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n", counter, fd[cpu][counter], strerror(errno));
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}
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}
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} else {
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attr->inherit = inherit;
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attr->disabled = 1;
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fd[0][counter] = sys_perf_counter_open(attr, 0, -1, -1, 0);
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if (fd[0][counter] < 0 && verbose) {
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printf("Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n", counter, fd[0][counter], strerror(errno));
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}
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}
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}
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/*
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* Does the counter have nsecs as a unit?
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*/
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static inline int nsec_counter(int counter)
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{
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if (attrs[counter].type != PERF_TYPE_SOFTWARE)
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return 0;
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if (attrs[counter].config == PERF_COUNT_CPU_CLOCK)
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return 1;
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if (attrs[counter].config == PERF_COUNT_TASK_CLOCK)
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return 1;
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return 0;
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}
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/*
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* Read out the results of a single counter:
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*/
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static void read_counter(int counter)
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{
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__u64 *count, single_count[3];
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ssize_t res;
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int cpu, nv;
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int scaled;
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count = event_res[counter];
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count[0] = count[1] = count[2] = 0;
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nv = scale ? 3 : 1;
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for (cpu = 0; cpu < nr_cpus; cpu ++) {
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if (fd[cpu][counter] < 0)
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continue;
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res = read(fd[cpu][counter], single_count, nv * sizeof(__u64));
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assert(res == nv * sizeof(__u64));
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count[0] += single_count[0];
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if (scale) {
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count[1] += single_count[1];
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count[2] += single_count[2];
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}
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}
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scaled = 0;
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if (scale) {
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if (count[2] == 0) {
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event_scaled[counter] = -1;
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count[0] = 0;
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return;
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}
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if (count[2] < count[1]) {
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event_scaled[counter] = 1;
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count[0] = (unsigned long long)
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((double)count[0] * count[1] / count[2] + 0.5);
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}
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}
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/*
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* Save the full runtime - to allow normalization during printout:
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*/
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if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
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attrs[counter].config == PERF_COUNT_TASK_CLOCK)
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runtime_nsecs = count[0];
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if (attrs[counter].type == PERF_TYPE_HARDWARE &&
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attrs[counter].config == PERF_COUNT_CPU_CYCLES)
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runtime_cycles = count[0];
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}
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/*
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* Print out the results of a single counter:
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*/
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static void print_counter(int counter)
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{
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__u64 *count;
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int scaled;
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count = event_res[counter];
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scaled = event_scaled[counter];
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if (scaled == -1) {
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fprintf(stderr, " %14s %-20s\n",
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"<not counted>", event_name(counter));
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return;
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}
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if (nsec_counter(counter)) {
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double msecs = (double)count[0] / 1000000;
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fprintf(stderr, " %14.6f %-20s",
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msecs, event_name(counter));
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if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
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attrs[counter].config == PERF_COUNT_TASK_CLOCK) {
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if (walltime_nsecs)
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fprintf(stderr, " # %11.3f CPU utilization factor",
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(double)count[0] / (double)walltime_nsecs);
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}
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} else {
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fprintf(stderr, " %14Ld %-20s",
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count[0], event_name(counter));
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if (runtime_nsecs)
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fprintf(stderr, " # %11.3f M/sec",
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(double)count[0]/runtime_nsecs*1000.0);
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if (runtime_cycles &&
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attrs[counter].type == PERF_TYPE_HARDWARE &&
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attrs[counter].config == PERF_COUNT_INSTRUCTIONS) {
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fprintf(stderr, " # %1.3f per cycle",
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(double)count[0] / (double)runtime_cycles);
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}
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}
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if (scaled)
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fprintf(stderr, " (scaled from %.2f%%)",
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(double) count[2] / count[1] * 100);
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fprintf(stderr, "\n");
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}
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static int do_perf_stat(int argc, const char **argv)
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{
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unsigned long long t0, t1;
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int counter;
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int status;
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int pid;
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int i;
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if (!system_wide)
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nr_cpus = 1;
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for (counter = 0; counter < nr_counters; counter++)
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create_perf_stat_counter(counter);
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/*
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* Enable counters and exec the command:
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*/
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t0 = rdclock();
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prctl(PR_TASK_PERF_COUNTERS_ENABLE);
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if ((pid = fork()) < 0)
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perror("failed to fork");
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if (!pid) {
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if (execvp(argv[0], (char **)argv)) {
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perror(argv[0]);
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exit(-1);
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}
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}
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while (wait(&status) >= 0)
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;
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prctl(PR_TASK_PERF_COUNTERS_DISABLE);
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t1 = rdclock();
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walltime_nsecs = t1 - t0;
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fflush(stdout);
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fprintf(stderr, "\n");
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fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
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for (i = 1; i < argc; i++)
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fprintf(stderr, " %s", argv[i]);
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fprintf(stderr, "\':\n");
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fprintf(stderr, "\n");
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for (counter = 0; counter < nr_counters; counter++)
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read_counter(counter);
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for (counter = 0; counter < nr_counters; counter++)
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print_counter(counter);
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fprintf(stderr, "\n");
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fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
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(double)(t1-t0)/1e6);
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fprintf(stderr, "\n");
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return 0;
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}
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static void skip_signal(int signo)
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{
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}
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static const char * const stat_usage[] = {
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"perf stat [<options>] <command>",
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NULL
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};
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static const struct option options[] = {
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OPT_CALLBACK('e', "event", NULL, "event",
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"event selector. use 'perf list' to list available events",
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parse_events),
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OPT_BOOLEAN('i', "inherit", &inherit,
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"child tasks inherit counters"),
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OPT_INTEGER('p', "pid", &target_pid,
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"stat events on existing pid"),
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OPT_BOOLEAN('a', "all-cpus", &system_wide,
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"system-wide collection from all CPUs"),
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OPT_BOOLEAN('S', "scale", &scale,
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"scale/normalize counters"),
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show counter open errors, etc)"),
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OPT_END()
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};
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int cmd_stat(int argc, const char **argv, const char *prefix)
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{
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page_size = sysconf(_SC_PAGE_SIZE);
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memcpy(attrs, default_attrs, sizeof(attrs));
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argc = parse_options(argc, argv, options, stat_usage, 0);
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if (!argc)
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usage_with_options(stat_usage, options);
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if (!nr_counters)
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nr_counters = 8;
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nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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assert(nr_cpus <= MAX_NR_CPUS);
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assert(nr_cpus >= 0);
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/*
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* We dont want to block the signals - that would cause
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* child tasks to inherit that and Ctrl-C would not work.
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* What we want is for Ctrl-C to work in the exec()-ed
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* task, but being ignored by perf stat itself:
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*/
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signal(SIGINT, skip_signal);
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signal(SIGALRM, skip_signal);
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signal(SIGABRT, skip_signal);
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return do_perf_stat(argc, argv);
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}
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