strictatime is the "heavy", relatime is "lighter", etc.
If unsure, say 'N'
+
+config UBIFS_FS_ENCRYPTION
+ bool "UBIFS Encryption"
+ depends on UBIFS_FS
+ select FS_ENCRYPTION
+ default n
+ help
+ Enable encryption of UBIFS files and directories. This
+ feature is similar to ecryptfs, but it is more memory
+ efficient since it avoids caching the encrypted and
+ decrypted pages in the page cache.