kmem change related trouble

[Lars Heidieker <lars%heidieker.de@localhost>]

Hi,

I've just posted a patch ( http://www.netbsd.org/~para/fix.patch )
- It moves uareas and buffer cache back to the kernel_map restoring
the previous behavior. Sizing the kmem_arena is changed accordingly
(Something I stepped on while checking evbmips on gxemul).
- Code to drain pools if the kmem_arena runs out of space.

kind regards,
Lars