/* * 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 * * Improvements and fixes by: * * Arjan van de Ven * Yanmin Zhang * Wu Fengguang * Mike Galbraith * Paul Mackerras * * 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 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, }; static __u64 event_res[MAX_COUNTERS][3]; static __u64 event_scaled[MAX_COUNTERS]; static __u64 runtime_nsecs; static __u64 walltime_nsecs; static __u64 runtime_cycles; 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[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)); 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[counter] = -1; count[0] = 0; return; } if (count[2] < count[1]) { event_scaled[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 = count[0]; if (attrs[counter].type == PERF_TYPE_HARDWARE && attrs[counter].config == PERF_COUNT_HW_CPU_CYCLES) runtime_cycles = count[0]; } /* * Print out the results of a single counter: */ static void print_counter(int counter) { __u64 *count; int scaled; count = event_res[counter]; scaled = event_scaled[counter]; if (scaled == -1) { fprintf(stderr, " %14s %-20s\n", "", event_name(counter)); return; } if (nsec_counter(counter)) { 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) fprintf(stderr, " # %11.3f CPU utilization factor", (double)count[0] / (double)walltime_nsecs); } } else { fprintf(stderr, " %14Ld %-20s", count[0], event_name(counter)); if (runtime_nsecs) fprintf(stderr, " # %11.3f M/sec", (double)count[0]/runtime_nsecs*1000.0); if (runtime_cycles && attrs[counter].type == PERF_TYPE_HARDWARE && attrs[counter].config == PERF_COUNT_HW_INSTRUCTIONS) { fprintf(stderr, " # %1.3f per cycle", (double)count[0] / (double)runtime_cycles); } } if (scaled) fprintf(stderr, " (scaled from %.2f%%)", (double) count[2] / count[1] * 100); fprintf(stderr, "\n"); } static int do_perf_stat(int argc, const char **argv) { unsigned long long t0, t1; int counter; int status; int pid; int i; 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); } } while (wait(&status) >= 0) ; prctl(PR_TASK_PERF_COUNTERS_DISABLE); t1 = rdclock(); walltime_nsecs = t1 - t0; 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, "\':\n"); fprintf(stderr, "\n"); for (counter = 0; counter < nr_counters; counter++) read_counter(counter); for (counter = 0; counter < nr_counters; counter++) print_counter(counter); fprintf(stderr, "\n"); fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n", (double)(t1-t0)/1e6); fprintf(stderr, "\n"); return 0; } 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 [] ", 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_END() }; int cmd_stat(int argc, const char **argv, const char *prefix) { 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 (!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); return do_perf_stat(argc, argv); }