1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 Facebook
3 #include <linux/bpf.h>
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_tracing.h>
6
7 struct {
8 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
9 __uint(max_entries, 1);
10 __type(key, int);
11 __type(value, int);
12 } array_1 SEC(".maps");
13
14 struct {
15 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
16 __uint(max_entries, 1);
17 __type(key, int);
18 __type(value, int);
19 __uint(map_flags, BPF_F_PRESERVE_ELEMS);
20 } array_2 SEC(".maps");
21
22 SEC("raw_tp/sched_switch")
23 int BPF_PROG(read_array_1)
24 {
25 struct bpf_perf_event_value val;
26
27 return bpf_perf_event_read_value(&array_1, 0, &val, sizeof(val));
28 }
29
30 SEC("raw_tp/task_rename")
31 int BPF_PROG(read_array_2)
32 {
33 struct bpf_perf_event_value val;
34
35 return bpf_perf_event_read_value(&array_2, 0, &val, sizeof(val));
36 }
37
38 char LICENSE[] SEC("license") = "GPL";
39
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