1 #include <linux/ptrace.h>
2 #include <linux/version.h>
3 #include <uapi/linux/bpf.h>
4 #include "bpf_helpers.h"
5
6 struct bpf_map_def SEC("maps") counters = {
7 .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
8 .key_size = sizeof(int),
9 .value_size = sizeof(u32),
10 .max_entries = 64,
11 };
12 struct bpf_map_def SEC("maps") values = {
13 .type = BPF_MAP_TYPE_HASH,
14 .key_size = sizeof(int),
15 .value_size = sizeof(u64),
16 .max_entries = 64,
17 };
18
19 SEC("kprobe/htab_map_get_next_key")
bpf_prog1(struct pt_regs * ctx)20 int bpf_prog1(struct pt_regs *ctx)
21 {
22 u32 key = bpf_get_smp_processor_id();
23 u64 count, *val;
24 s64 error;
25
26 count = bpf_perf_event_read(&counters, key);
27 error = (s64)count;
28 if (error <= -2 && error >= -22)
29 return 0;
30
31 val = bpf_map_lookup_elem(&values, &key);
32 if (val)
33 *val = count;
34 else
35 bpf_map_update_elem(&values, &key, &count, BPF_NOEXIST);
36
37 return 0;
38 }
39
40 char _license[] SEC("license") = "GPL";
41 u32 _version SEC("version") = LINUX_VERSION_CODE;
42