diff options
| author | Andrew Morton <akpm@digeo.com> | 2003-02-05 16:57:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@home.transmeta.com> | 2003-02-05 16:57:23 -0800 |
| commit | 1f1921fc15dc2408ab3900d036cffcf0d732801f (patch) | |
| tree | 8e17e9927b68558eab699161701642838b51cc43 /include | |
| parent | f93fcfa9e8a17bb8ef6a631ace1a14b02091e08f (diff) | |
[PATCH] Optimise follow_page() for page-table-based hugepages
ia32 and others can determine a page's hugeness by inspecting the pmd's value
directly. No need to perform a VMA lookup against the user's virtual
address.
This patch ifdef's away the VMA-based implementation of
hugepage-aware-follow_page for ia32 and replaces it with a pmd-based
implementation.
The intent is that architectures will implement one or the other. So the architecture either:
1: Implements hugepage_vma()/follow_huge_addr(), and stubs out
pmd_huge()/follow_huge_pmd() or
2: Implements pmd_huge()/follow_huge_pmd(), and stubs out
hugepage_vma()/follow_huge_addr()
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hugetlb.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 6b2f606c08f7..b51d51d05190 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -24,6 +24,10 @@ struct page *follow_huge_addr(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, int write); struct vm_area_struct *hugepage_vma(struct mm_struct *mm, unsigned long address); +struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, + pmd_t *pmd, int write); +int pmd_huge(pmd_t pmd); + extern int htlbpage_max; static inline void @@ -51,6 +55,8 @@ static inline int is_vm_hugetlb_page(struct vm_area_struct *vma) #define hugetlb_report_meminfo(buf) 0 #define hugepage_vma(mm, addr) 0 #define mark_mm_hugetlb(mm, vma) do { } while (0) +#define follow_huge_pmd(mm, addr, pmd, write) 0 +#define pmd_huge(x) 0 #endif /* !CONFIG_HUGETLB_PAGE */ |