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  • Performance counter pools contain byte ranges of buffers. Whenever a performance counter dump is triggered, the driver removes a range from the pool, writes the performance counter values from the hardware into it, then signals the client using OnPerformanceCounterReadCompleted. Pool IDs are arbitrary uint64 values that are allocated by the client.
  • Describes a set of performance counters. The exact meaning depends on the specific driver, but often is a bitvector representing whether each performance counter is enabled or disabled.