// Finish sweep before we start concurrent scan.
	systemstack(func() {
		finishsweep_m()
	})

	// clearpools before we start the GC. If we wait the memory will not be
	// reclaimed until the next GC cycle.
	clearpools()

	work.cycles.Add(1)

	// Assists and workers can start the moment we start
	// the world.
	gcController.startCycle(now, int(gomaxprocs), trigger)