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#include "perf-sys.h"
14
15#define SAMPLE_PERIOD  0x7fffffffffffffffULL
16
17static void test_bpf_perf_event(void)
18{
19	int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
20	int *pmu_fd = malloc(nr_cpus * sizeof(int));
21	int status, i;
22
23	struct perf_event_attr attr_insn_pmu = {
24		.freq = 0,
25		.sample_period = SAMPLE_PERIOD,
26		.inherit = 0,
27		.type = PERF_TYPE_HARDWARE,
28		.read_format = 0,
29		.sample_type = 0,
30		.config = 0,/* PMU: cycles */
31	};
32
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);
35		if (pmu_fd[i] < 0) {
36			printf("event syscall failed\n");
37			goto exit;
38		}
39
40		bpf_map_update_elem(map_fd[0], &i, &pmu_fd[i], BPF_ANY);
41		ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0);
42	}
43
44	status = system("ls > /dev/null");
45	if (status)
46		goto exit;
47	status = system("sleep 2");
48	if (status)
49		goto exit;
50
51exit:
52	for (i = 0; i < nr_cpus; i++)
53		close(pmu_fd[i]);
54	close(map_fd[0]);
55	free(pmu_fd);
56}
57
58int main(int argc, char **argv)
59{
60	char filename[256];
61
62	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
63
64	if (load_bpf_file(filename)) {
65		printf("%s", bpf_log_buf);
66		return 1;
67	}
68
69	test_bpf_perf_event();
70	read_trace_pipe();
71
72	return 0;
73}