metricsLock()
	initMetrics()

	systemstack(func() {
		// Donate the racectx to g0. readMetricsLocked calls into the race detector
		// via map access.
		getg().racectx = getg().m.curg.racectx

		// Read the metrics once before in case it allocates and skews the metrics.
		// readMetricsLocked is designed to only allocate the first time it is called