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
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