| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <linux/bpf.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <bpf_helpers.h> |
| |
| struct bpf_map_def SEC("maps") cpu_pid = { |
| .type = BPF_MAP_TYPE_ARRAY, |
| .key_size = sizeof(int), |
| .value_size = sizeof(uint32_t), |
| /* Assume max of 1024 CPUs */ |
| .max_entries = 1024, |
| }; |
| |
| struct switch_args { |
| unsigned long long ignore; |
| char prev_comm[16]; |
| int prev_pid; |
| int prev_prio; |
| long long prev_state; |
| char next_comm[16]; |
| int next_pid; |
| int next_prio; |
| }; |
| |
| SEC("tracepoint/sched/sched_switch") |
| int tp_sched_switch(struct switch_args* args) { |
| int key; |
| uint32_t val; |
| |
| key = bpf_get_smp_processor_id(); |
| val = args->next_pid; |
| |
| bpf_map_update_elem(&cpu_pid, &key, &val, BPF_ANY); |
| return 0; |
| } |
| |
| char _license[] SEC("license") = "GPL"; |