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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | // SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2016 Facebook */ #define _GNU_SOURCE #include <sched.h> #include <errno.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 <bpf/bpf.h> #include <bpf/libbpf.h> #define MAX_CNT 1000000 static struct bpf_link *links[2]; static struct bpf_object *obj; static int cnt; 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++) { if (write(fd, buf, sizeof(buf)) < 0) { printf("task rename failed: %s\n", strerror(errno)); close(fd); return; } } 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++) { if (read(fd, buf, sizeof(buf)) < 0) { printf("failed to read from /dev/urandom: %s\n", strerror(errno)); close(fd); return; } } 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 int load_progs(char *filename) { struct bpf_program *prog; int err = 0; obj = bpf_object__open_file(filename, NULL); err = libbpf_get_error(obj); if (err < 0) { fprintf(stderr, "ERROR: opening BPF object file failed\n"); return err; } /* load BPF program */ err = bpf_object__load(obj); if (err < 0) { fprintf(stderr, "ERROR: loading BPF object file failed\n"); return err; } bpf_object__for_each_program(prog, obj) { links[cnt] = bpf_program__attach(prog); err = libbpf_get_error(links[cnt]); if (err < 0) { fprintf(stderr, "ERROR: bpf_program__attach failed\n"); links[cnt] = NULL; return err; } cnt++; } return err; } static void unload_progs(void) { while (cnt) bpf_link__destroy(links[--cnt]); bpf_object__close(obj); } int main(int argc, char **argv) { int num_cpu = sysconf(_SC_NPROCESSORS_ONLN); int test_flags = ~0; char filename[256]; int err = 0; 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]); printf("w/KPROBE\n"); err = load_progs(filename); if (!err) run_perf_test(num_cpu, test_flags >> 2); unload_progs(); } if (test_flags & 0x30) { snprintf(filename, sizeof(filename), "%s_tp_kern.o", argv[0]); printf("w/TRACEPOINT\n"); err = load_progs(filename); if (!err) run_perf_test(num_cpu, test_flags >> 4); unload_progs(); } if (test_flags & 0xC0) { snprintf(filename, sizeof(filename), "%s_raw_tp_kern.o", argv[0]); printf("w/RAW_TRACEPOINT\n"); err = load_progs(filename); if (!err) run_perf_test(num_cpu, test_flags >> 6); unload_progs(); } return err; } |