Re: [PATCH 06/19] mm: numa: teach gup_fast about pmd_numa

[Mel Gorman]

On Tue, Nov 13, 2012 at 11:07:36AM +0100, Ingo Molnar wrote:
> 
> * Mel Gorman <mgorman@xxxxxxx> wrote:
> 
> > From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> > 
> > When scanning pmds, the pmd may be of numa type (_PAGE_PRESENT not set),
> > however the pte might be present. Therefore, gup_pmd_range() must return
> > 0 in this case to avoid losing a NUMA hinting page fault during gup_fast.
> > 
> > Note: gup_fast will skip over non present ptes (like numa 
> > types), so no explicit check is needed for the pte_numa case. 
> > [...]
> 
> So, why not fix all architectures that choose to expose 
> pte_numa() and pmd_numa() methods - via the patch below?
> 

I'll pick it up. Thanks.

-- 
Mel Gorman
SUSE Labs
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