.

wcfs/wcfs.go

@@ -959,6 +959,9 @@ retry:
 	// cover history for at least 1 minute, but including all watches.
 	// No need to lock anything because we are holding zheadMu and
 	// setupWatch too runs with zheadMu locked.
+	//
+	// TODO shrink δFtail only once in a while - there is no need to compute
+	// revCut and cut δFtail on every transaction.
 	revCut := zodb.TidFromTime(zhead.At().Time().Add(-1*time.Minute))
 	for wlink := range head.wlinkTab {
 		for _, w := range wlink.byfile {