Names is a helper that produces a mapping of event names to event types.

NoExperiment is the reserved ID 0 indicating no experiment.

ArgTypes is a list of valid argument types for use in Args.

UserGoReqs is a common requirement among events that are running or are close to running user code.

SchedReqs is a set of constraints on what the scheduling context must look like.

Spec is a specification for a trace event.

Constraint represents a various presence requirements.

Experiment is an experiment ID that events may be associated with.

Type indicates an event's type from which its arguments and semantics can be derived.