Messages in this thread |  | | | Date | Tue, 11 Apr 2006 22:53:09 +0200 | | From | Carsten Otte <> | | Subject | Re: [patch] do_no_pfn handler |
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Linus Torvalds wrote: > Now, the kernel page table accessor macros are certainly generic enough > that you could have your own "COW bits" macro, and make this all an > architecture-specific feature (and simply not allow it on architectures > that don't have a sw-usable COW bit) > > It so happens that S390 seems to be one of the very few architectures that > doesn't have room for that bit in its regular page table layout, and > that's arguably a design problem for S390. But you _could_ just allocate > extra memory for page tables, and put the COW bit there. The VM wouldn't > care - at that point it would fit in the "larger picture" of just having > the COW information directly in the page tables (even if the "page tables" > would be partly just sw-defined). Interresting idea. Sounds more feasible then splitting vmas, I am going to think about it. Thanks! --
Carsten Otte IBM Linux technology center ARCH=s390 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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