projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 72874418 BG |
1 | /* Copyright 2016 Netflix, Inc. |
| 2 | * | |
| 3 | * This program is free software; you can redistribute it and/or | |
| 4 | * modify it under the terms of version 2 of the GNU General Public | |
| 5 | * License as published by the Free Software Foundation. | |
| 6 | */ | |
| 7 | #include <linux/version.h> | |
| 8 | #include <linux/ptrace.h> | |
| 9 | #include <uapi/linux/bpf.h> | |
| 10 | #include <uapi/linux/bpf_perf_event.h> | |
| 7cf245a3 THJ |
11 | #include <bpf/bpf_helpers.h> |
| 12 | #include <bpf/bpf_tracing.h> | |
| 72874418 BG |
13 | |
| 14 | #define MAX_IPS 8192 | |
| 15 | ||
| 59929cd1 DL |
16 | struct { |
| 17 | __uint(type, BPF_MAP_TYPE_HASH); | |
| 18 | __type(key, u64); | |
| 19 | __type(value, u32); | |
| 20 | __uint(max_entries, MAX_IPS); | |
| 21 | } ip_map SEC(".maps"); | |
| 72874418 BG |
22 | |
| 23 | SEC("perf_event") | |
| 24 | int do_sample(struct bpf_perf_event_data *ctx) | |
| 25 | { | |
| 26 | u64 ip; | |
| 27 | u32 *value, init_val = 1; | |
| 28 | ||
| 2dbb4c05 | 29 | ip = PT_REGS_IP(&ctx->regs); |
| 72874418 BG |
30 | value = bpf_map_lookup_elem(&ip_map, &ip); |
| 31 | if (value) | |
| 32 | *value += 1; | |
| 33 | else | |
| 34 | /* E2BIG not tested for this example only */ | |
| 35 | bpf_map_update_elem(&ip_map, &ip, &init_val, BPF_NOEXIST); | |
| 36 | ||
| 37 | return 0; | |
| 38 | } | |
| 39 | char _license[] SEC("license") = "GPL"; |