> > You tweaked my curiosity, so I de-inlined copy_to/from_user and did
> > some comparisons. Bottom line is that on my machine it doesn't seem
> > to care either way.. performance stayed the same. I did Bonnie and
> > some network throughput tests in four configs. I'm only posting the
> > Bonnie runs in the interest of brevity.
>
> ext2 file system code uses memcpy_fromfs to copy blocks, not
> copy_to/from_user.
2.1.x doesn't have a memcpy_fromfs() so it's rather unlikely ;)
2.0 memcpy_fromfs has been renamed to copy_from_user() in early 2.1.
So ext2 uses cfu like everyone else.
-A.