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 __uint(key_size, sizeof(int)); 11 __uint(value_size, sizeof(int)); 12 } array_1 SEC(".maps"); 13 14 struct { 15 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); 16 __uint(max_entries, 1); 17 __uint(key_size, sizeof(int)); 18 __uint(value_size, sizeof(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