tools/testing/selftests/bpf/progs/bpf_loop_bench.c

   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 }