for d = sched.deferpool; d != nil; d = dlink {
		dlink = d.link
		d.link = nil
	}
	sched.deferpool = nil
	unlock(&sched.deferlock)
}

// Timing

// itoaDiv formats val/(10**dec) into buf.
func itoaDiv(buf []byte, val uint64, dec int) []byte {
	i := len(buf) - 1
	idec := i - dec
	for val >= 10 || i >= idec {
		buf[i] = byte(val%10 + '0')
		i--
		if i == idec {
			buf[i] = '.'