Collapse the table of content
Expand the table of content

DPC class

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

The following syntax is simplified from MOF code.


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


The DPC class has these types of members:


The DPC class has these properties.

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

DPC entry time.

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.


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.


Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]



© 2016 Microsoft