Messages in this thread Patch in this message | | | Date | Tue, 4 Jan 2005 11:38:20 -0800 (PST) | From | Christoph Lameter <> | Subject | page fault scalability patch V14 [5/7]: x86_64 atomic pte operations |
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Changelog * Provide atomic pte operations for x86_64
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Index: linux-2.6.10/include/asm-x86_64/pgalloc.h =================================================================== --- linux-2.6.10.orig/include/asm-x86_64/pgalloc.h 2005-01-03 10:31:31.000000000 -0800 +++ linux-2.6.10/include/asm-x86_64/pgalloc.h 2005-01-03 12:21:28.000000000 -0800 @@ -7,6 +7,10 @@ #include <linux/threads.h> #include <linux/mm.h>
+#define PMD_NONE 0 +#define PUD_NONE 0 +#define PGD_NONE 0 + #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) + + 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; +} + extern __inline__ pmd_t *get_pmd(void) { return (pmd_t *)get_zeroed_page(GFP_KERNEL); Index: linux-2.6.10/include/asm-x86_64/pgtable.h =================================================================== --- linux-2.6.10.orig/include/asm-x86_64/pgtable.h 2005-01-03 10:31:31.000000000 -0800 +++ linux-2.6.10/include/asm-x86_64/pgtable.h 2005-01-03 12:13:17.000000000 -0800 @@ -413,6 +413,10 @@ #define kc_offset_to_vaddr(o) \ (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
+ +#define ptep_cmpxchg(__vma,__addr,__xp,__oldval,__newval) (cmpxchg(&(__xp)->pte, pte_val(__oldval), pte_val(__newval)) == pte_val(__oldval)) +#define __HAVE_ARCH_ATOMIC_TABLE_OPS + #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY #define __HAVE_ARCH_PTEP_GET_AND_CLEAR - 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/
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