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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futex_bench.c (850B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
      4 */
      5
      6#define _GNU_SOURCE
      7
      8#include <stdio.h>
      9#include <sys/syscall.h>
     10#include <time.h>
     11#include <unistd.h>
     12#include <linux/futex.h>
     13
     14#include "utils.h"
     15
     16#define ITERATIONS 100000000
     17
     18#define futex(A, B, C, D, E, F)	 syscall(__NR_futex, A, B, C, D, E, F)
     19
     20int test_futex(void)
     21{
     22	struct timespec ts_start, ts_end;
     23	unsigned long i = ITERATIONS;
     24
     25	clock_gettime(CLOCK_MONOTONIC, &ts_start);
     26
     27	while (i--) {
     28		unsigned int addr = 0;
     29		futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
     30	}
     31
     32	clock_gettime(CLOCK_MONOTONIC, &ts_end);
     33
     34	printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
     35
     36	return 0;
     37}
     38
     39int main(void)
     40{
     41	test_harness_set_timeout(300);
     42	return test_harness(test_futex, "futex_bench");
     43}