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/bpf_helpers.h> 10 #include <bpf/bpf_tracing.h> 11 12 char _license[] SEC("license") = "GPL"; 13 14 SEC("raw_tracepoint/kfree_skb") nested_loops(volatile struct pt_regs * ctx)15int nested_loops(volatile struct pt_regs* ctx) 16 { 17 int i, j, sum = 0, m; 18 19 for (j = 0; j < 300; j++) 20 for (i = 0; i < j; i++) { 21 if (j & 1) 22 m = PT_REGS_RC(ctx); 23 else 24 m = j; 25 sum += i * m; 26 } 27 28 return sum; 29 } 30