9 #include <linux/perf_event.h>
10 #include <linux/bpf.h>
15 #define SAMPLE_PERIOD 0x7fffffffffffffffULL
17 static void test_bpf_perf_event(void)
19 int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
20 int *pmu_fd = malloc(nr_cpus * sizeof(int));
23 struct perf_event_attr attr_insn_pmu = {
25 .sample_period = SAMPLE_PERIOD,
27 .type = PERF_TYPE_HARDWARE,
30 .config = 0,/* PMU: cycles */
33 for (i = 0; i < nr_cpus; i++) {
34 pmu_fd[i] = sys_perf_event_open(&attr_insn_pmu, -1/*pid*/, i/*cpu*/, -1/*group_fd*/, 0);
36 printf("event syscall failed\n");
40 bpf_map_update_elem(map_fd[0], &i, &pmu_fd[i], BPF_ANY);
41 ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0);
44 status = system("ls > /dev/null");
47 status = system("sleep 2");
52 for (i = 0; i < nr_cpus; i++)
58 int main(int argc, char **argv)
62 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
64 if (load_bpf_file(filename)) {
65 printf("%s", bpf_log_buf);
69 test_bpf_perf_event();