Revamp profile and process handling

Also, introduce the Internal flag to Profiles

process/database.go

@@ -106,32 +106,33 @@ func CleanProcessStorage(activePIDs map[int]struct{}) {
 
 	// clean primary processes
 	for _, p := range processesCopy {
-		p.Lock()
+		// The PID of a process does not change.
 
-		_, active := activePIDs[p.Pid]
-		switch {
-		case p.Pid == UnidentifiedProcessID:
-			// internal
-		case p.Pid == SystemProcessID:
-			// internal
-		case active:
-			// process in system process table or recently seen on the network
-		default:
-			// delete now or soon
-			switch {
-			case p.LastSeen == 0:
-				// add last
-				p.LastSeen = time.Now().Unix()
-			case p.LastSeen > threshold:
-				// within keep period
-			default:
-				// delete now
-				log.Tracef("process.clean: deleted %s", p.DatabaseKey())
-				go p.Delete()
-			}
+		// Check if this is a special process.
+		if p.Pid == UnidentifiedProcessID || p.Pid == SystemProcessID {
+			p.profile.MarkStillActive()
+			continue
 		}
 
-		p.Unlock()
+		// Check if process is active.
+		_, active := activePIDs[p.Pid]
+		if active {
+			p.profile.MarkStillActive()
+			continue
+		}
+
+		// Process is inactive, start deletion process
+		switch {
+		case p.LastSeen == 0:
+			// add last
+			p.LastSeen = time.Now().Unix()
+		case p.LastSeen > threshold:
+			// within keep period
+		default:
+			// delete now
+			p.Delete()
+			log.Tracef("process: cleaned %s", p.DatabaseKey())
+		}
 	}
 }