// SPDX-License-Identifier: GPL-2.0-only #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <stdbool.h> #include <string.h> #include <fcntl.h> #include <poll.h> #include <linux/perf_event.h> #include <linux/bpf.h> #include <errno.h> #include <assert.h> #include <sys/syscall.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <time.h> #include <signal.h> #include <bpf/libbpf.h> #include "bpf_load.h" #include "perf-sys.h" static __u64 time_get_ns(void) { struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); return ts.tv_sec * 1000000000ull + ts.tv_nsec; } static __u64 start_time; static __u64 cnt; #define MAX_CNT 100000ll static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size) { struct { __u64 pid; __u64 cookie; } *e = data; if (e->cookie != 0x12345678) { printf("BUG pid %llx cookie %llx sized %d\n", e->pid, e->cookie, size); return; } cnt++; if (cnt == MAX_CNT) { printf("recv %lld events per sec\n", MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); return; } } int main(int argc, char **argv) { struct perf_buffer_opts pb_opts = {}; struct perf_buffer *pb; char filename[256]; FILE *f; int ret; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } pb_opts.sample_cb = print_bpf_output; pb = perf_buffer__new(map_fd[0], 8, &pb_opts); ret = libbpf_get_error(pb); if (ret) { printf("failed to setup perf_buffer: %d\n", ret); return 1; } f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r"); (void) f; start_time = time_get_ns(); while ((ret = perf_buffer__poll(pb, 1000)) >= 0 && cnt < MAX_CNT) { } kill(0, SIGINT); return ret; }