cpuBuf      [2]*traceBuf

	reader atomic.Pointer[g] // goroutine that called ReadTrace, or nil

	// Fast mappings from enumerations to string IDs that are prepopulated
	// in the trace.
	markWorkerLabels [2][len(gcMarkWorkerModeStrings)]traceArg
	goStopReasons    [2][len(traceGoStopReasonStrings)]traceArg
	goBlockReasons   [2][len(traceBlockReasonStrings)]traceArg

	// enabled indicates whether tracing is enabled, but it is only an optimization,

	// should run until it is preempted and account its time
	// against gcController.idleMarkTime.
	gcMarkWorkerIdleMode
)

// gcMarkWorkerModeStrings are the strings labels of gcMarkWorkerModes
// to use in execution traces.
var gcMarkWorkerModeStrings = [...]string{
	"Not worker",
	"GC (dedicated)",
	"GC (fractional)",
	"GC (idle)",
}