Package perfctr: Information

This package adds support for using the Performance-Monitoring
Counters (PMCs) found in many modern processors.

PMCs are "event counters" capable of recording any of a large
number of performance-related events during execution.
These events typically include instructions executed, cache
misses, TLB misses, stalls, and other events specific to
the microarchitecture of the processor being used.

PMCs are primarily used to identify low-level performance problems,
and to validate code changes intended to improve performance.

Package perfctr: Information

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