On Sun, May 12, 2013 at 9:23 AM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> @@ -1120,7 +1119,7 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
>
> page = pmd_page(orig_pmd);
> VM_BUG_ON(!PageCompound(page) || !PageHead(page));
> - if (page_mapcount(page) == 1) {
> + if (PageAnon(page) && page_mapcount(page) == 1) {
Could we avoid copying huge page if
no-one else is using it, no matter anon?
> pmd_t entry;
> entry = pmd_mkyoung(orig_pmd);
> entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
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