Messages in this thread | | | Subject | Re: [PATCH] ppc64: 64K pages support | From | Benjamin Herrenschmidt <> | Date | Sat, 05 Nov 2005 11:44:47 +1100 |
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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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