DPC class

Article
01/07/2021

This class is the event type class for device deferred procedure call (DPC) events.

The following syntax is simplified from MOF code.

Syntax

[EventType{66, 68, 69}, EventTypeName{"ThreadDPC", "DPC", "TimerDPC"}]
class DPC : PerfInfo
{
  object InitialTime;
  uint32 Routine;
};

Members

The DPC class has these types of members:

Properties

Properties

The DPC class has these properties.

InitialTime

Data type: object
Access type: Read-only
Qualifiers: WmiDataId(1), Extension("WmiTime")

DPC entry time.

Routine

Data type: uint32
Access type: Read-only
Qualifiers: WmiDataId(2), Pointer

Address of DPC routine. Use the address with the Image events to find which image started.

Remarks

These events are logged when a DPC is entered. You use these events to monitor and verify the behavior of drivers and kernel-mode components. For example, you can use DPC, ISR, and Image events to determine those components that spend too much time at high interrupt levels. DPC and ISR events have an entry time stamp which is used to compute the duration of the routines. The image events are read to construct the memory regions that map to certain modules. You can use the mapping to locate the module that contains the interrupt routine.

The TimerDPC event records when a DPC fires as a result of a timer expiration and the ThreadDPC event records when a threaded DPC executes.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]

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