大页面申请及使用

#include <tchar.h>
#include <windows.h>
#include <time.h>

void Privilege(TCHAR* pszPrivilege, BOOL bEnable)
{
    HANDLE              hToken = NULL;
    TOKEN_PRIVILEGES    tp = {};
    OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES  TOKEN_QUERY, &hToken);
    LookupPrivilegeValue(NULL, pszPrivilege, &tp.Privileges[0].Luid);
    tp.PrivilegeCount = 1;
    tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
    AdjustTokenPrivileges(hToken, FALSE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, 0);
    CloseHandle(hToken);
}

int _tmain(int argc, _TCHAR* argv[])
{
    // 设置随机数种子
    srand((unsigned int)time(NULL));
    // 提权
    Privilege(TEXT("SeLockMemoryPrivilege"), TRUE);
    // 获取大页面大小
    SIZE_T szLargePage = GetLargePageMinimum();
    // 保留空间 64 * szLargePage
    PVOID pBuffer = VirtualAlloc(0, 64 * szLargePage, MEM_RESERVE, PAGE_READWRITE);
    // 使用 MEM_LARGE_PAGES 标志提交内存
    VirtualAlloc(pBuffer, 2 * szLargePage, MEM_COMMIT  MEM_LARGE_PAGES, PAGE_READWRITE);
    // 测试内存数据
    double* pdbArray = (double*)pBuffer;
    for (int i = 0; i < (int)(2 * szLargePage / sizeof(double)); i++)
    {
        pdbArray[i] = 1.0f * rand();
    }
    // 释放内存
    VirtualFree(pBuffer, 0, MEM_RELEASE);
    return 0;
}