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 <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
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