#define PROTECTION (PROT_READ | PROT_WRITE)
#define LENGTH (4*1024)
 
#ifndef MAP_HUGETLB
#define MAP_HUGETLB 0x40000
#endif
 
#define ADDR (void *) (0x0UL)
#define FLAGS (MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB)
 
int main (int argc,char *argv[]){
...
  // allocate a buffer with the same size as the LLC using huge pages
  buf = mmap(ADDR,LENGTH,PROTECTION,FLAGS,0);
  if (buf == MAP_Failed) {
    perror("mmap");
    exit(1);
  }
...}

硬件：我有8G内存.处理器是ivybridge

Uname输出：

Linux mymachine 3.13.0-43-generic #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

编辑1：perror的输出

mmap: Cannot allocate memory

还添加了一行来打印errno

printf("something is wrong: %d\n",errno);

但输出是：

something is wrong: 12

编辑2：来自/ proc / meminfo的巨大的tlb相关信息

HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB