1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2021 Facebook */ 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_helpers.h> 6 #include "bpf_misc.h" 7 8 char _license[] SEC("license") = "GPL"; 9 10 u32 nr_loops; 11 long hits; 12 13 static int empty_callback(__u32 index, void *data) 14 { 15 return 0; 16 } 17 18 SEC("fentry/" SYS_PREFIX "sys_getpgid") 19 int benchmark(void *ctx) 20 { 21 for (int i = 0; i < 1000; i++) { 22 bpf_loop(nr_loops, empty_callback, NULL, 0); 23 24 __sync_add_and_fetch(&hits, nr_loops); 25 } 26 return 0; 27 } 28