1// SPDX-License-Identifier: GPL-2.0
 2// Copyright (c) 2019 Facebook
 3
 4#include <linux/ptrace.h>
 5#include <linux/bpf.h>
 6#include "bpf_helpers.h"
 7
 8struct {
 9	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
10	__uint(key_size, sizeof(int));
11	__uint(value_size, sizeof(int));
12} perf_buf_map SEC(".maps");
13
14SEC("kprobe/sys_nanosleep")
15int handle_sys_nanosleep_entry(struct pt_regs *ctx)
16{
17	int cpu = bpf_get_smp_processor_id();
18
19	bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU,
20			      &cpu, sizeof(cpu));
21	return 0;
22}
23
24char _license[] SEC("license") = "GPL";
25__u32 _version SEC("version") = 1;