| Date | Thu, 23 May 2013 19:57:24 +0800 | Subject | Re: [PATCHv4 37/39] thp: handle write-protect exception to file-backed huge pages | From | Hillf Danton <> |
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On Sun, May 12, 2013 at 9:23 AM, Kirill A. Shutemov <kirill.shutemov@linux.intel.com> 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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