cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf_loop_bench.c (484B)

      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
      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
     18SEC("fentry/" SYS_PREFIX "sys_getpgid")
     19int 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}