MSDN的帮助虽然不错，但还是有些地方有问题，如：ms-help://MS.MSDNQTR.2003FEB.2052/sysinfo/base/ntquery

When the SystemInformationClass parameter is SystemProcessorPerformanceInformation, the buffer pointed to by the SystemInformation parameter should be large enough to hold an array containing as many SYSTEM_PROCESS_INFORMATION structures
//注，上面的结构是进程信息

as there are processors (CPUs) installed in the system. Each structure has the following layout:

typedef struct
_SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION {
    LARGE_INTEGER IdleTime;
    LARGE_INTEGER KernelTime;
    LARGE_INTEGER UserTime;
    LARGE_INTEGER Reserved1[2];
    ULONG Reserved2;
} SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION;

The IdleTime element contains the amount of time that the system has been idle, in 1/100ths of a nanosecond.

The KernelTime element contains the amount of time that the system has spent executing in Kernel mode (including all threads in all processes, on all processors), in 1/100ths of a nanosecond.

The UserTime element contains the amount of time that the system has spent executing in User mode (including all threads in all processes, on all processors), in 1/100ths of a nanosecond.

Use instead to retrieve this information.

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