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2.2.4.5 _PERF_INSTANCE_HEADER

The _PERF_INSTANCE_HEADER structure is used at the beginning of an instance block that is returned when enumerating counterset instances or when returning performance counter data from multiple instances.

typedef struct _PERF_INSTANCE_HEADER {
  unsigned long Size;
  unsigned long InstanceId;
} PERF_INSTANCE_HEADER, 
 *PPERF_INSTANCE_HEADER;

Size: The total size, in bytes, of the structure and the instance name.

InstanceId: The counterset instance identifier. Each active instance of a counterset can be identified by the combination of its instance name and instance identifier. Two active instances of a counterset SHOULD NOT have the same combination of instance name and instance identifier. <3>

 
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