1
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 <bpf/libbpf.h>
19#include "bpf_load.h"
20#include "perf-sys.h"
21
22static __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
30static __u64 start_time;
31static __u64 cnt;
32
33#define MAX_CNT 100000ll
34
35static 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
57int 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
