* [PATCH] mm: migration: pair unlock_page and lock_page when migrating huge pages
@ 2011-11-25 12:20 Hillf Danton
2011-11-26 17:33 ` Andrea Arcangeli
0 siblings, 1 reply; 2+ messages in thread
From: Hillf Danton @ 2011-11-25 12:20 UTC (permalink / raw)
To: Naoya Horiguchi; +Cc: Andrea Arcangeli, Andrew Morton, LKML, linux-mm
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);
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] mm: migration: pair unlock_page and lock_page when migrating huge pages
2011-11-25 12:20 [PATCH] mm: migration: pair unlock_page and lock_page when migrating huge pages Hillf Danton
@ 2011-11-26 17:33 ` Andrea Arcangeli
0 siblings, 0 replies; 2+ messages in thread
From: Andrea Arcangeli @ 2011-11-26 17:33 UTC (permalink / raw)
To: Hillf Danton; +Cc: Naoya Horiguchi, Andrew Morton, LKML, linux-mm
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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^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-11-25 12:20 [PATCH] mm: migration: pair unlock_page and lock_page when migrating huge pages Hillf Danton
2011-11-26 17:33 ` Andrea Arcangeli
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