lkml.org 
[lkml]   [2005]   [Jan]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: page fault scalability patch V14 [5/7]: x86_64 atomic pte operations
From
Date
Christoph Lameter <clameter@sgi.com> writes:

I bet this has been never tested.

> #define pmd_populate_kernel(mm, pmd, pte) \
> set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
> #define pud_populate(mm, pud, pmd) \
> @@ -14,11 +18,24 @@
> #define pgd_populate(mm, pgd, pud) \
> set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
>
> +#define pmd_test_and_populate(mm, pmd, pte) \
> + (cmpxchg((int *)pmd, PMD_NONE, _PAGE_TABLE | __pa(pte)) == PMD_NONE)
> +#define pud_test_and_populate(mm, pud, pmd) \
> + (cmpxchg((int *)pgd, PUD_NONE, _PAGE_TABLE | __pa(pmd)) == PUD_NONE)
> +#define pgd_test_and_populate(mm, pgd, pud) \
> + (cmpxchg((int *)pgd, PGD_NONE, _PAGE_TABLE | __pa(pud)) == PGD_NONE)
> +

Shouldn't this all be (long *)pmd ? page table entries on x86-64 are 64bit.
Also why do you cast at all? i think the macro should handle an arbitary
pointer.

> +
> static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
> {
> set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
> }
>
> +static inline int pmd_test_and_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
> +{
> + return cmpxchg((int *)pmd, PMD_NONE, _PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)) == PMD_NONE;

Same.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:09    [W:0.069 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site