1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <stdio.h> 3 #include <unistd.h> 4 #include <stdlib.h> 5 #include <stdbool.h> 6 #include <string.h> 7 #include <fcntl.h> 8 #include <poll.h> 9 #include <linux/perf_event.h> 10 #include <linux/bpf.h> 11 #include <errno.h> 12 #include <assert.h> 13 #include <sys/syscall.h> 14 #include <sys/ioctl.h> 15 #include <sys/mman.h> 16 #include <time.h> 17 #include <signal.h> 18 #include <libbpf.h> 19 #include "bpf_load.h" 20 #include "perf-sys.h" 21 22 static __u64 time_get_ns(void) 23 { 24 struct timespec ts; 25 26 clock_gettime(CLOCK_MONOTONIC, &ts); 27 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 28 } 29 30 static __u64 start_time; 31 static __u64 cnt; 32 33 #define MAX_CNT 100000ll 34 35 static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size) 36 { 37 struct { 38 __u64 pid; 39 __u64 cookie; 40 } *e = data; 41 42 if (e->cookie != 0x12345678) { 43 printf("BUG pid %llx cookie %llx sized %d\n", 44 e->pid, e->cookie, size); 45 return; 46 } 47 48 cnt++; 49 50 if (cnt == MAX_CNT) { 51 printf("recv %lld events per sec\n", 52 MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); 53 return; 54 } 55 } 56 57 int main(int argc, char **argv) 58 { 59 struct perf_buffer_opts pb_opts = {}; 60 struct perf_buffer *pb; 61 char filename[256]; 62 FILE *f; 63 int ret; 64 65 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 66 67 if (load_bpf_file(filename)) { 68 printf("%s", bpf_log_buf); 69 return 1; 70 } 71 72 pb_opts.sample_cb = print_bpf_output; 73 pb = perf_buffer__new(map_fd[0], 8, &pb_opts); 74 ret = libbpf_get_error(pb); 75 if (ret) { 76 printf("failed to setup perf_buffer: %d\n", ret); 77 return 1; 78 } 79 80 f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r"); 81 (void) f; 82 83 start_time = time_get_ns(); 84 while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) { 85 } 86 kill(0, SIGINT); 87 return ret; 88 } 89