On Sat, 2005-11-05 at 01:38 +0100, Christoph Hellwig wrote:
> So how does the 64k on 4k hardware emulation work? When Hugh did
> bigger softpagesize for x86 based on 2.4.x he had to fix drivers all
> over to deal with that.
What was the problem with drivers ? On ppc64, it's all hidden in the
arch code. All the kernel sees is a 64k page size. I extended the PTE to
contain tracking informations for the 16 sub pages (HPTE bits & hash
slot index). Sub pages are faulted on demand and flushed all at once,
but it's all transparent to the generic code.
Ben.
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