https://msdn.microsoft.com/en-us/library/windows/desktop/ms683219(v=vs.85).aspx
例子：
https://msdn.microsoft.com/en-us/library/windows/desktop/ms682050(v=vs.85).aspx
http://blog.csdn.net/calculatorw/article/details/8192305
http://blog.csdn.net/caimouse/article/details/1947575
还有 GetProcessWorkingSetSize
http://blog.csdn.net/calculatorw/article/details/8192191