Re: [PATCH] mm,migration: Avoid race between shift_arg_pages() andrmap_walk() during migration by not migrating temporary stacks

[Rik van Riel]

On 05/11/2010 04:57 AM, Mel Gorman wrote:
> Hi Andrew,
>
> This patch closes the most important race in relation to exec and
> migration. With it applied, the swapops bug is no longer triggering for
> known problem workloads. If you pick it up, it should go with the other
> mmmigration-* fixes in mm.

> This patch causes pages within the temporary stack during exec to be skipped
> by migration. It does this by marking the VMA covering the temporary stack
> with an otherwise impossible combination of VMA flags. These flags are
> cleared when the temporary stack is moved to its final location.
>
> [kamezawa.hiroyu@xxxxxxxxxxxxxx: Idea for having migration skip temporary stacks]
> Signed-off-by: Mel Gorman<mel@xxxxxxxxx>
> Reviewed-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@xxxxxxxxxxxxxx>

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

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