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 | |