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SubjectRe: Hugepages demand paging V1 [2/4]: set_huge_pte() arch updates
On Thu, Oct 21, 2004 at 09:57:23PM -0700, Christoph Lameter wrote:
> Changelog
> * Update set_huge_pte throughout all arches
> * set_huge_pte has an additional address argument
> * set_huge_pte must also do what update_mmu_cache typically does
> for PAGESIZE ptes.
> Signed-off-by: Christoph Lameter <clameter@sgi.com>

What's described above is not what the patch implements. The patch is
calling update_mmu_cache() in a loop on all the virtual base pages of a
virtual hugepage, which won't help at all, as it doesn't understand how
to find the hugepages regardless of virtual address. AFAICT code to
actually do the equivalent of update_mmu_cache() on hugepages most
likely involves privileged instructions and perhaps digging around some
cpu-specific data structures (e.g. the natively architected pagetables
bearing no resemblance to Linux') for almost every non-x86 architecture.


-- wli
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