lkml.org 
[lkml]   [2004]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subjectpage fault scalability patch V9: [6/7] atomic pte operations for x86_64
    Changelog
    * Provide atomic pte operations for x86_64

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

    Index: linus/include/asm-x86_64/pgalloc.h
    ===================================================================
    --- linus.orig/include/asm-x86_64/pgalloc.h 2004-09-18 14:25:23.000000000 -0700
    +++ linus/include/asm-x86_64/pgalloc.h 2004-09-18 14:25:23.000000000 -0700
    @@ -7,16 +7,26 @@
    #include <linux/threads.h>
    #include <linux/mm.h>

    +#define PMD_NONE 0
    +#define PGD_NONE 0
    +
    #define pmd_populate_kernel(mm, pmd, pte) \
    set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
    #define pgd_populate(mm, pgd, pmd) \
    set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pmd)))
    +#define pgd_test_and_populate(mm, pgd, pmd) \
    + (cmpxchg(pgd, PGD_NONE, _PAGE_TABLE | __pa(pmd)) == 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(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: linus/include/asm-x86_64/pgtable.h
    ===================================================================
    --- linus.orig/include/asm-x86_64/pgtable.h 2004-09-18 14:25:23.000000000 -0700
    +++ linus/include/asm-x86_64/pgtable.h 2004-09-18 14:25:23.000000000 -0700
    @@ -436,6 +436,11 @@
    #define kc_offset_to_vaddr(o) \
    (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))

    +
    +#define ptep_xchg(mm,addr,xp,newval) __pte(xchg(&(xp)->pte, pte_val(newval))
    +#define ptep_cmpxchg(mm,addr,xp,newval,oldval) (cmpxchg(&(xp)->pte, pte_val(newval), pte_val(oldval) == 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/

    \
     
     \ /
      Last update: 2005-03-22 14:06    [W:0.043 / U:148.744 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site