haveMin := s.min.Load()
	haveMax := s.max.Load()
	needMin := alignDown(uintptr(chunkIndex(base)), physPageSize/scSize)
	needMax := alignUp(uintptr(chunkIndex(limit)), physPageSize/scSize)

	// We need a contiguous range, so extend the range if there's no overlap.
	if needMax < haveMin {
		needMax = haveMin
	}
	if haveMax != 0 && needMin > haveMax {
		needMin = haveMax
	}