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 static 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 25 SEC("fentry/" SYS_PREFIX "sys_getpgid") 26 int benchmark(void *ctx) 27 { 28 bpf_loop(1000, outer_loop, NULL, 0); 29 return 0; 30 } 31