From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by kanga.kvack.org (Postfix) with ESMTP id 7FF45828DF for ; Fri, 11 Mar 2016 17:59:51 -0500 (EST) Received: by mail-pa0-f45.google.com with SMTP id tt10so110440091pab.3 for ; Fri, 11 Mar 2016 14:59:51 -0800 (PST) Received: from mga04.intel.com (mga04.intel.com. [192.55.52.120]) by mx.google.com with ESMTP id w13si6174544pas.67.2016.03.11.14.59.32 for ; Fri, 11 Mar 2016 14:59:32 -0800 (PST) From: "Kirill A. Shutemov" Subject: [PATCHv4 09/25] thp: handle file pages in split_huge_pmd() Date: Sat, 12 Mar 2016 01:59:01 +0300 Message-Id: <1457737157-38573-10-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1457737157-38573-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1457737157-38573-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Dickins , Andrea Arcangeli , Andrew Morton Cc: Dave Hansen , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Jerome Marchand , Yang Shi , Sasha Levin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, "Kirill A. Shutemov" Splitting THP PMD is simple: just unmap it as in DAX case. Unlike DAX, we also remove the page from rmap and drop reference. Signed-off-by: Kirill A. Shutemov --- mm/huge_memory.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index c22144e3fe11..51c54d5a945b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2930,10 +2930,16 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, count_vm_event(THP_SPLIT_PMD); - if (vma_is_dax(vma)) { - pmd_t _pmd = pmdp_huge_clear_flush_notify(vma, haddr, pmd); + if (!vma_is_anonymous(vma)) { + _pmd = pmdp_huge_clear_flush_notify(vma, haddr, pmd); if (is_huge_zero_pmd(_pmd)) put_huge_zero_page(); + if (vma_is_dax(vma)) + return; + page = pmd_page(_pmd); + page_remove_rmap(page, true); + put_page(page); + add_mm_counter(mm, MM_FILEPAGES, -HPAGE_PMD_NR); return; } else if (is_huge_zero_pmd(*pmd)) { return __split_huge_zero_page_pmd(vma, haddr, pmd); -- 2.7.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org