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
	}

// makeBenchString makes a benchmark string consumable by Go's benchmarking tools.
func makeBenchString(name string) string {
	needCap := true
	ret := []rune("Benchmark")
	for _, r := range name {
		if unicode.IsSpace(r) {
			needCap = true
			continue
		}
		if needCap {
			r = unicode.ToUpper(r)
			needCap = false
		}
		ret = append(ret, r)
	}
	return string(ret)
}