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NS:perflib._PERF_DATA_HEADER |
PERF_DATA_HEADER (perflib.h) |
Provides information about the PERF_DATA_HEADER block that contains the structure. |
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perf\perf_data_header.htm |
perf |
0B30B30A-2B2D-43D8-B6DD-58C70D54EB58 |
12/05/2018 |
*PPERF_DATA_HEADER, PERF_DATA_HEADER, PERF_DATA_HEADER structure [Perf], PPERF_DATA_HEADER, PPERF_DATA_HEADER structure pointer [Perf], perf.perf_data_header, perflib/PERF_DATA_HEADER, perflib/PPERF_DATA_HEADER |
perflib.h |
Windows |
Windows 10, version 1607 [desktop apps only] |
Windows Server 2016 [desktop apps only] |
Windows |
PERF_DATA_HEADER, *PPERF_DATA_HEADER |
19H1 |
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Provides information about the PERF_DATA_HEADER block that contains the structure. A PERF_DATA_HEADER block corresponds to one query specification in a query, and consists of a PERF_DATA_HEADER structure followed by a sequence of PERF_COUNTER_HEADER blocks.
The sum of the size of the PERF_DATA_HEADER structure and the sizes of all of the PERF_COUNTER_HEADER blocks in the PERF_DATA_HEADER block.
The number of PERF_COUNTER_HEADER blocks that the PERF_DATA_HEADER block contains.
The timestamp from a high-resolution clock.
The number of 100 nanosecond intervals since January 1, 1601, in Coordinated Universal Time (UTC).
The frequency of a high-resolution clock.
The time at which data is collected by the provider.
The ordering of the PERF_COUNTER_HEADER blocks is based on the Index member of the PERF_COUNTER_IDENTIFIER blocks that the PerfQueryCounterInfo function gets. Each PERF_COUNTER_HEADER block is 8-byte aligned, so the value of the dwTotalSize is a multiple of 8 bytes.
The timestamp information in the PERF_DATA_HEADER structure is required when you compute the display values of certain performance counters.