Re: [PATCH v2] mm: thp: Set the accessed flag for old pages onaccess fault.

From: Andrew Morton
Date: Thu Oct 18 2012 - 18:04:57 EST

On Wed, 17 Oct 2012 16:54:02 +0100
Will Deacon <will.deacon@xxxxxxx> wrote:

> On x86 memory accesses to pages without the ACCESSED flag set result in the
> ACCESSED flag being set automatically. With the ARM architecture a page access
> fault is raised instead (and it will continue to be raised until the ACCESSED
> flag is set for the appropriate PTE/PMD).
> For normal memory pages, handle_pte_fault will call pte_mkyoung (effectively
> setting the ACCESSED flag). For transparent huge pages, pmd_mkyoung will only
> be called for a write fault.
> This patch ensures that faults on transparent hugepages which do not result
> in a CoW update the access flags for the faulting pmd.

Confused. Where is the arm implementation of update_mmu_cache_pmd()?
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