SYSTEM_PROCESSOR_IDLE_INFORMATION

The SYSTEM_PROCESSOR_IDLE_INFORMATION structure is produced in the output buffer by a successful call to the following functions:

• ZwQuerySystemInformation or NtQuerySystemInformation;
• ZwQuerySystemInformationEx or NtQuerySystemInformationEx;

when given the information class SystemProcessorIdleInformation (0x2A).

Documentation Status

The SYSTEM_PROCESSOR_IDLE_INFORMATION structure is not documented.

Microsoft does publish the practical equivalent of a C-language definition as type information in public symbol files, though not for the kernel, where the structure is prepared, nor even for low-level user-mode DLLs that interpret the structure, but for various higher-level user-mode DLLs such as URLMON.DLL and only then starting with version 6.2.

Layout

The SYSTEM_PROCESSOR_IDLE_INFORMATION is 0x30 bytes in both 32-bit and 64-bit Windows.

ULONGLONG IdleTime;

ULONGLONG C1Time;

ULONGLONG C2Time;

ULONGLONG C3Time;

ULONG C1Transitions;

ULONG C2Transitions;

ULONG C3Transitions;

ULONG Padding;