loop1.c

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