mm: mm_event: add special kernel allocation stat
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / samples / bpf / test_overhead_kprobe_kern.c
1 /* Copyright (c) 2016 Facebook
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 "bpf_helpers.h"
11
12 #define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
13
14 SEC("kprobe/__set_task_comm")
15 int prog(struct pt_regs *ctx)
16 {
17 struct signal_struct *signal;
18 struct task_struct *tsk;
19 char oldcomm[16] = {};
20 char newcomm[16] = {};
21 u16 oom_score_adj;
22 u32 pid;
23
24 tsk = (void *)PT_REGS_PARM1(ctx);
25
26 pid = _(tsk->pid);
27 bpf_probe_read(oldcomm, sizeof(oldcomm), &tsk->comm);
28 bpf_probe_read(newcomm, sizeof(newcomm), (void *)PT_REGS_PARM2(ctx));
29 signal = _(tsk->signal);
30 oom_score_adj = _(signal->oom_score_adj);
31 return 0;
32 }
33
34 SEC("kprobe/urandom_read")
35 int prog2(struct pt_regs *ctx)
36 {
37 return 0;
38 }
39
40 char _license[] SEC("license") = "GPL";
41 u32 _version SEC("version") = LINUX_VERSION_CODE;