Re: [PATCH 06/63] mm: Prevent parallel splits during THP migration

[Rik van Riel]

On 10/07/2013 06:28 AM, Mel Gorman wrote:
> THP migrations are serialised by the page lock but on its own that does
> not prevent THP splits. If the page is split during THP migration then
> the pmd_same checks will prevent page table corruption but the unlock page
> and other fix-ups potentially will cause corruption. This patch takes the
> anon_vma lock to prevent parallel splits during migration.
> 
> Cc: stable <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

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

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