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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | /* Copyright (c) 2016 Facebook * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #define _GNU_SOURCE #include <sched.h> #include <stdio.h> #include <sys/types.h> #include <asm/unistd.h> #include <fcntl.h> #include <unistd.h> #include <assert.h> #include <sys/wait.h> #include <stdlib.h> #include <signal.h> #include <linux/bpf.h> #include <string.h> #include <time.h> #include <sys/resource.h> #include "libbpf.h" #include "bpf_load.h" #define MAX_CNT 1000000 static __u64 time_get_ns(void) { struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); return ts.tv_sec * 1000000000ull + ts.tv_nsec; } static void test_task_rename(int cpu) { __u64 start_time; char buf[] = "test\n"; int i, fd; fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); if (fd < 0) { printf("couldn't open /proc\n"); exit(1); } start_time = time_get_ns(); for (i = 0; i < MAX_CNT; i++) write(fd, buf, sizeof(buf)); printf("task_rename:%d: %lld events per sec\n", cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); close(fd); } static void test_urandom_read(int cpu) { __u64 start_time; char buf[4]; int i, fd; fd = open("/dev/urandom", O_RDONLY); if (fd < 0) { printf("couldn't open /dev/urandom\n"); exit(1); } start_time = time_get_ns(); for (i = 0; i < MAX_CNT; i++) read(fd, buf, sizeof(buf)); printf("urandom_read:%d: %lld events per sec\n", cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); close(fd); } static void loop(int cpu, int flags) { cpu_set_t cpuset; CPU_ZERO(&cpuset); CPU_SET(cpu, &cpuset); sched_setaffinity(0, sizeof(cpuset), &cpuset); if (flags & 1) test_task_rename(cpu); if (flags & 2) test_urandom_read(cpu); } static void run_perf_test(int tasks, int flags) { pid_t pid[tasks]; int i; for (i = 0; i < tasks; i++) { pid[i] = fork(); if (pid[i] == 0) { loop(i, flags); exit(0); } else if (pid[i] == -1) { printf("couldn't spawn #%d process\n", i); exit(1); } } for (i = 0; i < tasks; i++) { int status; assert(waitpid(pid[i], &status, 0) == pid[i]); assert(status == 0); } } static void unload_progs(void) { close(prog_fd[0]); close(prog_fd[1]); close(event_fd[0]); close(event_fd[1]); } int main(int argc, char **argv) { struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; char filename[256]; int num_cpu = 8; int test_flags = ~0; setrlimit(RLIMIT_MEMLOCK, &r); if (argc > 1) test_flags = atoi(argv[1]) ? : test_flags; if (argc > 2) num_cpu = atoi(argv[2]) ? : num_cpu; if (test_flags & 0x3) { printf("BASE\n"); run_perf_test(num_cpu, test_flags); } if (test_flags & 0xC) { snprintf(filename, sizeof(filename), "%s_kprobe_kern.o", argv[0]); if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } printf("w/KPROBE\n"); run_perf_test(num_cpu, test_flags >> 2); unload_progs(); } if (test_flags & 0x30) { snprintf(filename, sizeof(filename), "%s_tp_kern.o", argv[0]); if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } printf("w/TRACEPOINT\n"); run_perf_test(num_cpu, test_flags >> 4); unload_progs(); } return 0; } |