NUMA memory block size

[Benjamin Herrenschmidt]

> That reminds me.  Are the htab sizes user-adjustable at all, or are they
> completely fixed in size by what the hardware wants?  It would be really
> nice to be able to disable relocation as early as possible and avoid any
> of the klimit or lmb-style memory allocations and leave them all up to
> the arch-independent bootmem allocator.  That's effectively what x86
> does by having a few pagetable structures actually defined in the kernel
> image.

There are a few things that, unfortunately, have to be "allocated"
early, that is when the OF client interface is still up. RTAS is one,
I think TCE tables too, the hash table is a bit nasty as we need it
up & running way before we get to setting up the bootmem.

Ben.


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