Re: Rusty's module talk at the Kernel Summit

[Cort Dougan <cort@fsmlabs.com>]

I checked out the sparc64 PTE structure.  It's not a bozo-design which I
thought it was (like some PPC's).  If you can select powers of 2 sizes my
concern is meaningless there since you can pick the appropriate
granularity.

A genuine Bershad-esque superpages design would be perfect there.

} Large PTE's aren't free either, though.  Cheap enough to implement but
} there's some fragmentation that isn't easy to deal with in some
} pathological cases.  The virtual space is pretty tight on some archs
} already.
} 
} A lot of stock distributions load most drivers as modules so a machine well
} stocked with devices may run into trouble.
} 
} } Modules can be mapped using a large PTE mapping.
} } I've been meaning to do this on sparc64 for a long
} } time.
} } 
} } So this TLB argument alone is not sufficient :-)
} } I do concur on the "ipv4 as module is difficult to
} } get correct" argument however.
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