Re: 2.6.38 page_test regression
From: Mel Gorman
Date: Thu Apr 14 2011 - 17:54:03 EST
On Thu, Apr 14, 2011 at 11:07:23PM +0300, raz ben yehuda wrote:
> bah. Mel is correct. I did mean page_test ( in my defense it is in the
> msg ).
> Here some more information:
> 1. I manage to lower the regression to 2 sha1's:
> 32dba98e085f8b2b4345887df9abf5e0e93bfc12 to
> though I had to remark wait_split_huge_page for the sake of
> compilation. up to 32dba98e085f8b2b4345887df9abf5e0e93bfc12 there is no
> 2. I booted 2.6.37-rc5 you gave me. same regression is there.
Extremely long shot - try this patch.
diff --git a/mm/memory.c b/mm/memory.c
index c50a195..a39baaf 100644
@@ -3317,7 +3317,7 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* run pte_offset_map on the pmd, if an huge pmd could
* materialize from under us from a different thread.
- if (unlikely(__pte_alloc(mm, vma, pmd, address)))
+ if (unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, vma, pmd, address))
/* if an huge pmd materialized from under us just retry later */
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/