RH backed it out after the second or third beta due to bugginess..
> This first patch creates a generic interface for registering caches with
> the VM subsystem so that they can react appropriately to memory
> pressure.
I'd suggest Ed Tomlinson's much saner interface that adds a third callbackj
to kmem_cache_t (similar to the Solaris implementation) instead.
Doing this outside slab is not a good idea (and XFS currently does
it too - in it's own code which should be replaced with Ed's one)
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