> > > One dutifully wonders whether all this functionality could be
> > > provided via FUSE...
> >
> > My main concern with FUSE has to do with shared memory mappings.
>
> OK. But I'm sure Miklos would appreciate help with that ;)
You bet.
> > My next concern is with regard to performance impact of constant
> > context switching during page reads and writes.
>
> Maybe. One could estimate the cost of that by benchmarking an existing
> (efficient) FUSE fs and then add fiddle factors. If the number of copies
> is the same for in-kernel versus FUSE then one would expect the performance
> to be similar. Especially if the encrypt/decryption cost perponderates.
The main overhead of FUSE is not in copies, but in context switching.
For I/O that can be mitigated by doing it in big chunks, otherwise the
only solution is adding more processors.
Miklos
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