}(); done {
		return
	}

	// We trigger the change of <currentUnix>.
	s.lock.Lock()
	defer s.lock.Unlock()
	if s.currentUnix == unixTime {
		s.currentCount.Add(1)
		return
	}

	s.updateHistory(s.currentUnix, s.currentCount.Load())
	s.currentUnix = unixTime
	s.currentCount.Store(1)

	// We only consider updating retryAfter when bumping the current second.

	for _, ds := range daemonSets {
		dsc.enqueueDaemonSet(ds)
	}
}

// updateHistory figures out what DaemonSet(s) manage a ControllerRevision when the ControllerRevision
// is updated and wake them up. If anything of the ControllerRevision has changed, we need to  awaken
// both the old and new DaemonSets.
func (dsc *DaemonSetsController) updateHistory(logger klog.Logger, old, cur interface{}) {
	curHistory := cur.(*apps.ControllerRevision)