theres a kernel file cache for cached mounts (see the -C option), tho its broken in labs plan9.
pages of executables are cached. the disk fileservers implement a buffer cache to avoid going to disk and do lazy writing out dirty filesystem blocks. plan9 is a distributed system. the disk fileservers are really network fileservers. and the local kernel isnt the only mutator so it cant invalidate the cache without going to the fileserver. -- cinap
