[rdiff-backup-users] Does rdiff implement kernel specific optimizations?

[Greg Freemyer]

Devels,

I just came across tee() and splice().  They were introduced in
2.6.17, so relatively new, but not that new.

http://linux.die.net/man/2/tee
http://linux.die.net/man/2/splice

They allow data to be copied from one file descriptor to another
without the data coming into userspace.

If I was still an active developer, I think about modifying
rdiff-backup to use them if there available.

I doubt it would really impact the speed of rdiff-backup, but it seems
like a fun project and I always liked learning new system calls.

Greg
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