Re: [PATCH 17/31] mm: numa: Avoid double faulting after migratingmisplaced page

[Rik van Riel]

On 11/13/2012 06:12 AM, Mel Gorman wrote:
> The pte_same check after a misplaced page is successfully migrated will
> never succeed and force a double fault to fix it up as pointed out by Rik
> van Riel. This was the "safe" option but it's expensive.
>
> This patch uses the migration allocation callback to record the location
> of the newly migrated page. If the page is the same when the PTE lock is
> reacquired it is assumed that it is safe to complete the pte_numa fault
> without incurring a double fault.
>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

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