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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2021 Facebook */3 4#include "vmlinux.h"5#include <bpf/bpf_helpers.h>6#include "bpf_misc.h"7 8char _license[] SEC("license") = "GPL";9 10u32 nr_loops;11long hits;12 13static int empty_callback(__u32 index, void *data)14{15 return 0;16}17 18static int outer_loop(__u32 index, void *data)19{20 bpf_loop(nr_loops, empty_callback, NULL, 0);21 __sync_add_and_fetch(&hits, nr_loops);22 return 0;23}24 25SEC("fentry/" SYS_PREFIX "sys_getpgid")26int benchmark(void *ctx)27{28 bpf_loop(1000, outer_loop, NULL, 0);29 return 0;30}31