PERF_MULTI_INSTANCES structure (perflib.h)
Provides information about the PERF_MULTI_INSTANCES block that contains the structure. A PERF_MULTI_INSTANCES block indicates the number of instances for which results are provided as part of the PERF_COUNTER_HEADER block in multiple-instance query. The PERF_MULTI_INSTANCES block consists of the following items in order:
- A PERF_MULTI_INSTANCES structure
- A number of instance data blocks. The number of instance data blocks that the PERF_MULTI_INSTANCES block contains is indicated ny the dwInstances member of the PERF_MULTI_INSTANCES structure. Each instance data block
consists of the following items in order:
- A PERF_INSTANCE_HEADER block
- A number of
PERF_COUNTER_DATA blocks. The number of PERF_COUNTER_DATA blocks depends on
the context:
- If the PERF_MULTI_INSTANCES block is part of a PERF_COUNTER_HEADER block with type PERF_MULTIPLE_INSTANCES, the instance data block contains one PERF_COUNTER_DATA block.
- If the PERF_MULTI_INSTANCES block is part of a PERF_COUNTER_HEADER block with type PERF_COUNTERSET, the number of PERF_COUNTER_DATA blocks is indicated by the PERF_MULTI_COUNTERS block.
Syntax
typedef struct _PERF_MULTI_INSTANCES {
ULONG dwTotalSize;
ULONG dwInstances;
} PERF_MULTI_INSTANCES, *PPERF_MULTI_INSTANCES;
Members
dwTotalSize
The total size of the PERF_MULTI_INSTANCES block, in bytes. This total size is the sum of the sizes of the PERF_MULTI_INSTANCES structure and the instance data blocks.
dwInstances
The number of instance data blocks in the PERF_MULTI_INSTANCES block.
Remarks
The PerfQueryCounterData function gets a PERF_DATA_HEADER block that may contain PERF_MULTI_INSTANCES blocks within the PERF_COUNTER_HEADER block.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 10, version 1607 [desktop apps only] |
| Minimum supported server | Windows Server 2016 [desktop apps only] |
| Header | perflib.h |