1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019 Facebook
3 #include <linux/sched.h>
4 #include <linux/ptrace.h>
5 #include <stdint.h>
6 #include <stddef.h>
7 #include <stdbool.h>
8 #include <linux/bpf.h>
9 #include "bpf_helpers.h"
10 
11 char _license[] SEC("license") = "GPL";
12 
13 SEC("raw_tracepoint/kfree_skb")
14 int nested_loops(volatile struct pt_regs* ctx)
15 {
16 	int i, j, sum = 0, m;
17 
18 	for (j = 0; j < 300; j++)
19 		for (i = 0; i < j; i++) {
20 			if (j & 1)
21 				m = PT_REGS_RC(ctx);
22 			else
23 				m = j;
24 			sum += i * m;
25 		}
26 
27 	return sum;
28 }
29