Here is an interesting post from Thomas Saviors blog aka ( My Oracle Life ). It shows some complicated things going on flushing the database buffer cache from various CON_IDs within a CDB.
12c buffer cache flushing
Obviously only the people doing design work at Oracle for 12c ( 12.1 and 12.2 heck maybe 13 ) know what the overall plan is for next set of features/changes for a container database. To me it seems very dangerous to know have a way of isolating one PDBs impact on other PDBs for the memory areas in the SGA ( shared pool / buffer cache etc ). Maybe this will be changing soon?
There are some interesting CDB presentations going to occur at Hotsos 2014 ( best practices etc ) that I will be attending that may give me a better idea of what other people are worrying about and planning on using in this new CDB/PDB universe.
Thanks to Thomas for pointing out his post!