clflush通过C函数使缓存行无效

Question

我试图用来clflush手动逐出缓存行，以确定缓存和行大小。我没有找到有关如何使用该指令的任何指南。我所看到的是一些为此目的使用更高级别功能的代码。有一个内核函数void clflush_cache_range(void *vaddr, unsigned int size)，但是我仍然不知道代码中包括什么以及如何使用它。我不知道size该功能是什么。不仅如此，我如何确保将行逐出以验证代码的正确性？更新：这是我要尝试执行的初始代码。#include <immintrin.h>#include <stdint.h>#include <x86intrin.h>#include <stdio.h>int main(){  int array[ 100 ];  /* will bring array in the cache */  for ( int i = 0; i < 100; i++ )    array[ i ] = i;  /* FLUSH A LINE */  /* each element is 4 bytes */  /* assuming that cache line size is 64 bytes */  /* array[0] till array[15] is flushed */  /* even if line size is less than 64 bytes */  /* we are sure that array[0] has been flushed */  _mm_clflush( &array[ 0 ] );  int tm = 0;  register uint64_t time1, time2, time3;  time1 = __rdtscp( &tm ); /* set timer */  time2 = __rdtscp( &array[ 0 ] ) - time1; /* array[0] is a cache miss */  printf( "miss latency = %lu \n", time2 );  time3 = __rdtscp( &array[ 0 ] ) - time2; /* array[0] is a cache hit */  printf( "hit latency = %lu \n", time3 );  return 0;}在运行代码之前，我想手动验证它是否正确。我走的路正确吗？我使用_mm_clflush正确吗？