1 /* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
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.
7 #include <linux/ptrace.h>
8 #include <linux/version.h>
9 #include <uapi/linux/bpf.h>
10 #include "bpf_helpers.h"
11 #include "bpf_tracing.h"
18 struct bpf_map_def SEC("maps") my_map = {
19 .type = BPF_MAP_TYPE_HASH,
20 .key_size = sizeof(long),
21 .value_size = sizeof(struct pair),
22 .max_entries = 1000000,
25 /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
26 * example will no longer be meaningful
28 SEC("kprobe/kmem_cache_free")
29 int bpf_prog1(struct pt_regs *ctx)
31 long ptr = PT_REGS_PARM2(ctx);
33 bpf_map_delete_elem(&my_map, &ptr);
37 SEC("kretprobe/kmem_cache_alloc_node")
38 int bpf_prog2(struct pt_regs *ctx)
40 long ptr = PT_REGS_RC(ctx);
43 /* get ip address of kmem_cache_alloc_node() caller */
44 BPF_KRETPROBE_READ_RET_IP(ip, ctx);
47 .val = bpf_ktime_get_ns(),
51 bpf_map_update_elem(&my_map, &ptr, &v, BPF_ANY);
54 char _license[] SEC("license") = "GPL";
55 u32 _version SEC("version") = LINUX_VERSION_CODE;