inotify.7: Mention cache rebuilding to handle overflow events

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/inotify.7

@@ -622,6 +622,13 @@ Note that the event queue can overflow.
 In this case, events are lost.
 Robust applications should handle the possibility of
 lost events gracefully.
+For example, it may be necessary to rebuild part or all of
+the application cache.
+(One simple, but possibly expensive,
+approach is to close the inotify file descriptor, empty the cache,
+create a new inotify file descriuptor,
+and then re-create watches and cache entries
+for the objects to be monitored.)
 
 The inotify API identifies affected files by filename.
 However, by the time an application processes an inotify event,