1 #include <linux/ptrace.h>
2 #include <linux/version.h>
3 #include <uapi/linux/bpf.h>
4 #include <bpf/bpf_helpers.h>
5
6 struct {
7 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
8 __uint(key_size, sizeof(int));
9 __uint(value_size, sizeof(u32));
10 __uint(max_entries, 64);
11 } counters SEC(".maps");
12
13 struct {
14 __uint(type, BPF_MAP_TYPE_HASH);
15 __type(key, int);
16 __type(value, u64);
17 __uint(max_entries, 64);
18 } values SEC(".maps");
19
20 struct {
21 __uint(type, BPF_MAP_TYPE_HASH);
22 __type(key, int);
23 __type(value, struct bpf_perf_event_value);
24 __uint(max_entries, 64);
25 } values2 SEC(".maps");
26
27 SEC("kprobe/htab_map_get_next_key")
bpf_prog1(struct pt_regs * ctx)28 int bpf_prog1(struct pt_regs *ctx)
29 {
30 u32 key = bpf_get_smp_processor_id();
31 u64 count, *val;
32 s64 error;
33
34 count = bpf_perf_event_read(&counters, key);
35 error = (s64)count;
36 if (error <= -2 && error >= -22)
37 return 0;
38
39 val = bpf_map_lookup_elem(&values, &key);
40 if (val)
41 *val = count;
42 else
43 bpf_map_update_elem(&values, &key, &count, BPF_NOEXIST);
44
45 return 0;
46 }
47
48 SEC("kprobe/htab_map_lookup_elem")
bpf_prog2(struct pt_regs * ctx)49 int bpf_prog2(struct pt_regs *ctx)
50 {
51 u32 key = bpf_get_smp_processor_id();
52 struct bpf_perf_event_value *val, buf;
53 int error;
54
55 error = bpf_perf_event_read_value(&counters, key, &buf, sizeof(buf));
56 if (error)
57 return 0;
58
59 val = bpf_map_lookup_elem(&values2, &key);
60 if (val)
61 *val = buf;
62 else
63 bpf_map_update_elem(&values2, &key, &buf, BPF_NOEXIST);
64
65 return 0;
66 }
67
68 char _license[] SEC("license") = "GPL";
69 u32 _version SEC("version") = LINUX_VERSION_CODE;
70