testing.B.previousDuration (field)

4 uses

	testing (current package)
		benchmark.go#L100: 	previousDuration time.Duration // total duration of the previous run
		benchmark.go#L222: 	b.previousDuration = b.duration
		benchmark.go#L938: 	if b.previousN > 0 && b.previousDuration > 0 {
		benchmark.go#L939: 		grain = 1e5 * uint64(b.previousN) / uint64(b.previousDuration)