1 /* Copyright (c) 2016 Facebook 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of version 2 of the GNU General Public 5 * License as published by the Free Software Foundation. 6 */ 7 #define _GNU_SOURCE 8 #include <sched.h> 9 #include <errno.h> 10 #include <stdio.h> 11 #include <sys/types.h> 12 #include <asm/unistd.h> 13 #include <fcntl.h> 14 #include <unistd.h> 15 #include <assert.h> 16 #include <sys/wait.h> 17 #include <stdlib.h> 18 #include <signal.h> 19 #include <linux/bpf.h> 20 #include <string.h> 21 #include <time.h> 22 #include <sys/resource.h> 23 #include <bpf/bpf.h> 24 #include "bpf_load.h" 25 26 #define MAX_CNT 1000000 27 28 static __u64 time_get_ns(void) 29 { 30 struct timespec ts; 31 32 clock_gettime(CLOCK_MONOTONIC, &ts); 33 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 34 } 35 36 static void test_task_rename(int cpu) 37 { 38 __u64 start_time; 39 char buf[] = "test\n"; 40 int i, fd; 41 42 fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); 43 if (fd < 0) { 44 printf("couldn't open /proc\n"); 45 exit(1); 46 } 47 start_time = time_get_ns(); 48 for (i = 0; i < MAX_CNT; i++) { 49 if (write(fd, buf, sizeof(buf)) < 0) { 50 printf("task rename failed: %s\n", strerror(errno)); 51 close(fd); 52 return; 53 } 54 } 55 printf("task_rename:%d: %lld events per sec\n", 56 cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); 57 close(fd); 58 } 59 60 static void test_urandom_read(int cpu) 61 { 62 __u64 start_time; 63 char buf[4]; 64 int i, fd; 65 66 fd = open("/dev/urandom", O_RDONLY); 67 if (fd < 0) { 68 printf("couldn't open /dev/urandom\n"); 69 exit(1); 70 } 71 start_time = time_get_ns(); 72 for (i = 0; i < MAX_CNT; i++) { 73 if (read(fd, buf, sizeof(buf)) < 0) { 74 printf("failed to read from /dev/urandom: %s\n", strerror(errno)); 75 close(fd); 76 return; 77 } 78 } 79 printf("urandom_read:%d: %lld events per sec\n", 80 cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); 81 close(fd); 82 } 83 84 static void loop(int cpu, int flags) 85 { 86 cpu_set_t cpuset; 87 88 CPU_ZERO(&cpuset); 89 CPU_SET(cpu, &cpuset); 90 sched_setaffinity(0, sizeof(cpuset), &cpuset); 91 92 if (flags & 1) 93 test_task_rename(cpu); 94 if (flags & 2) 95 test_urandom_read(cpu); 96 } 97 98 static void run_perf_test(int tasks, int flags) 99 { 100 pid_t pid[tasks]; 101 int i; 102 103 for (i = 0; i < tasks; i++) { 104 pid[i] = fork(); 105 if (pid[i] == 0) { 106 loop(i, flags); 107 exit(0); 108 } else if (pid[i] == -1) { 109 printf("couldn't spawn #%d process\n", i); 110 exit(1); 111 } 112 } 113 for (i = 0; i < tasks; i++) { 114 int status; 115 116 assert(waitpid(pid[i], &status, 0) == pid[i]); 117 assert(status == 0); 118 } 119 } 120 121 static void unload_progs(void) 122 { 123 close(prog_fd[0]); 124 close(prog_fd[1]); 125 close(event_fd[0]); 126 close(event_fd[1]); 127 } 128 129 int main(int argc, char **argv) 130 { 131 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 132 char filename[256]; 133 int num_cpu = 8; 134 int test_flags = ~0; 135 136 setrlimit(RLIMIT_MEMLOCK, &r); 137 138 if (argc > 1) 139 test_flags = atoi(argv[1]) ? : test_flags; 140 if (argc > 2) 141 num_cpu = atoi(argv[2]) ? : num_cpu; 142 143 if (test_flags & 0x3) { 144 printf("BASE\n"); 145 run_perf_test(num_cpu, test_flags); 146 } 147 148 if (test_flags & 0xC) { 149 snprintf(filename, sizeof(filename), 150 "%s_kprobe_kern.o", argv[0]); 151 if (load_bpf_file(filename)) { 152 printf("%s", bpf_log_buf); 153 return 1; 154 } 155 printf("w/KPROBE\n"); 156 run_perf_test(num_cpu, test_flags >> 2); 157 unload_progs(); 158 } 159 160 if (test_flags & 0x30) { 161 snprintf(filename, sizeof(filename), 162 "%s_tp_kern.o", argv[0]); 163 if (load_bpf_file(filename)) { 164 printf("%s", bpf_log_buf); 165 return 1; 166 } 167 printf("w/TRACEPOINT\n"); 168 run_perf_test(num_cpu, test_flags >> 4); 169 unload_progs(); 170 } 171 172 if (test_flags & 0xC0) { 173 snprintf(filename, sizeof(filename), 174 "%s_raw_tp_kern.o", argv[0]); 175 if (load_bpf_file(filename)) { 176 printf("%s", bpf_log_buf); 177 return 1; 178 } 179 printf("w/RAW_TRACEPOINT\n"); 180 run_perf_test(num_cpu, test_flags >> 6); 181 unload_progs(); 182 } 183 184 return 0; 185 } 186