tools/testing/selftests/bpf/progs/test_pe_preserve_elems.c

   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";