diff options
Diffstat (limited to 'samples/bpf/test_overhead_kprobe.bpf.c')
| -rw-r--r-- | samples/bpf/test_overhead_kprobe.bpf.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/samples/bpf/test_overhead_kprobe.bpf.c b/samples/bpf/test_overhead_kprobe.bpf.c new file mode 100644 index 000000000..668cf5259 --- /dev/null +++ b/samples/bpf/test_overhead_kprobe.bpf.c @@ -0,0 +1,41 @@ +/* Copyright (c) 2016 Facebook + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + */ +#include "vmlinux.h" +#include <linux/version.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> +#include <bpf/bpf_core_read.h> + +SEC("kprobe/__set_task_comm") +int prog(struct pt_regs *ctx) +{ + struct signal_struct *signal; + struct task_struct *tsk; + char oldcomm[TASK_COMM_LEN] = {}; + char newcomm[TASK_COMM_LEN] = {}; + u16 oom_score_adj; + u32 pid; + + tsk = (void *)PT_REGS_PARM1_CORE(ctx); + + pid = BPF_CORE_READ(tsk, pid); + bpf_core_read_str(oldcomm, sizeof(oldcomm), &tsk->comm); + bpf_core_read_str(newcomm, sizeof(newcomm), + (void *)PT_REGS_PARM2(ctx)); + signal = BPF_CORE_READ(tsk, signal); + oom_score_adj = BPF_CORE_READ(signal, oom_score_adj); + return 0; +} + +SEC("kprobe/fib_table_lookup") +int prog2(struct pt_regs *ctx) +{ + return 0; +} + +char _license[] SEC("license") = "GPL"; +u32 _version SEC("version") = LINUX_VERSION_CODE; |