[PATCH 3/3] mm: Use ptep/pmdp_set_numa for updating _PAGE_NUMA bit

[Mel Gorman]

On Tue, Feb 11, 2014 at 04:04:55PM +0530, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
> 
> Archs like ppc64 doesn't do tlb flush in set_pte/pmd functions. ppc64 also doesn't implement
> flush_tlb_range. ppc64 require the tlb flushing to be batched within ptl locks. The reason
> to do that is to ensure that the hash page table is in sync with linux page table.
> We track the hpte index in linux pte and if we clear them without flushing hash and drop the
> ptl lock, we can have another cpu update the pte and can end up with double hash. We also want
> to keep set_pte_at simpler by not requiring them to do hash flush for performance reason.
> Hence cannot use them while updating _PAGE_NUMA bit. Add new functions for marking pte/pmd numa
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

Acked-by: Mel Gorman <mgorman at suse.de>

-- 
Mel Gorman
SUSE Labs