+SReclaimable: Part of Slab, that might be reclaimed, such as caches
+ SUnreclaim: Part of Slab, that cannot be reclaimed on memory pressure
+ PageTables: amount of memory dedicated to the lowest level of page
+ tables.
+NFS_Unstable: NFS pages sent to the server, but not yet committed to stable
+ storage
+ Bounce: Memory used for block device "bounce buffers"
+WritebackTmp: Memory used by FUSE for temporary writeback buffers