Hillf Danton wrote:
> 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?
Because it has at least once VMA suitable for huge pages.
Yes, we can't collapse pages in file-backed VMAs yet, but It's better to
be consistent to avoid issues when collapsing will be implemented.
--
Kirill A. Shutemov
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