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SubjectRe: [PATCH] mm: migration: pair unlock_page and lock_page when migrating huge pages
Hi Hillf,

On Fri, Nov 25, 2011 at 08:20:31PM +0800, Hillf Danton wrote:
> Skip unlocking page if fail to lock, then lock and unlock are paired.
>
> Signed-off-by: Hillf Danton <dhillf@gmail.com>
> ---
>
> --- a/mm/migrate.c Fri Nov 25 20:11:14 2011
> +++ b/mm/migrate.c Fri Nov 25 20:21:26 2011
> @@ -869,9 +869,9 @@ static int unmap_and_move_huge_page(new_
>
> if (anon_vma)
> put_anon_vma(anon_vma);
> -out:
> unlock_page(hpage);
>
> +out:
> if (rc != -EAGAIN) {
> list_del(&hpage->lru);
> put_page(hpage);

Looks good, I guess that path wasn't exercised frequently because
there's no blocking I/O involvement with hugetlbfs.

Thanks,
Andrea


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