1#include <stdio.h>
 2#include <unistd.h>
 3#include <stdlib.h>
 4#include <stdbool.h>
 5#include <string.h>
 6#include <fcntl.h>
 7#include <poll.h>
 8#include <sys/ioctl.h>
 9#include <linux/perf_event.h>
10#include <linux/bpf.h>
11#include "libbpf.h"
12#include "bpf_load.h"
13
14#define SAMPLE_PERIOD  0x7fffffffffffffffULL
15
16static void test_bpf_perf_event(void)
17{
18	int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
19	int *pmu_fd = malloc(nr_cpus * sizeof(int));
20	int status, i;
21
22	struct perf_event_attr attr_insn_pmu = {
23		.freq = 0,
24		.sample_period = SAMPLE_PERIOD,
25		.inherit = 0,
26		.type = PERF_TYPE_HARDWARE,
27		.read_format = 0,
28		.sample_type = 0,
29		.config = 0,/* PMU: cycles */
30	};
31
32	for (i = 0; i < nr_cpus; i++) {
33		pmu_fd[i] = perf_event_open(&attr_insn_pmu, -1/*pid*/, i/*cpu*/, -1/*group_fd*/, 0);
34		if (pmu_fd[i] < 0) {
35			printf("event syscall failed\n");
36			goto exit;
37		}
38
39		bpf_update_elem(map_fd[0], &i, &pmu_fd[i], BPF_ANY);
40		ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0);
41	}
42
43	status = system("ls > /dev/null");
44	if (status)
45		goto exit;
46	status = system("sleep 2");
47	if (status)
48		goto exit;
49
50exit:
51	for (i = 0; i < nr_cpus; i++)
52		close(pmu_fd[i]);
53	close(map_fd[0]);
54	free(pmu_fd);
55}
56
57int main(int argc, char **argv)
58{
59	char filename[256];
60
61	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
62
63	if (load_bpf_file(filename)) {
64		printf("%s", bpf_log_buf);
65		return 1;
66	}
67
68	test_bpf_perf_event();
69	read_trace_pipe();
70
71	return 0;
72}