On Sun, May 12, 2013 at 9:23 AM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> @@ -3301,12 +3335,23 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
> {
> pte_t *page_table;
> spinlock_t *ptl;
> + pgtable_t pgtable = NULL;
> struct page *page, *cow_page, *dirty_page = NULL;
> - pte_t entry;
> bool anon = false, page_mkwrite = false;
> bool write = flags & FAULT_FLAG_WRITE;
> + bool thp = flags & FAULT_FLAG_TRANSHUGE;
> + unsigned long addr_aligned;
> struct vm_fault vmf;
> - int ret;
> + int nr, ret;
> +
> + if (thp) {
> + if (!transhuge_vma_suitable(vma, address))
> + return VM_FAULT_FALLBACK;
> + if (unlikely(khugepaged_enter(vma)))
vma->vm_mm now is under the care of khugepaged, why?
> + return VM_FAULT_OOM;
> + addr_aligned = address & HPAGE_PMD_MASK;
> + } else
> + addr_aligned = address & PAGE_MASK;
>
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