From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pb0-f42.google.com (mail-pb0-f42.google.com [209.85.160.42]) by kanga.kvack.org (Postfix) with ESMTP id B17EB6B004D for ; Mon, 23 Sep 2013 08:06:18 -0400 (EDT) Received: by mail-pb0-f42.google.com with SMTP id un15so3147727pbc.29 for ; Mon, 23 Sep 2013 05:06:18 -0700 (PDT) From: "Kirill A. Shutemov" Subject: [PATCHv6 21/22] thp, mm: split huge page on mmap file page Date: Mon, 23 Sep 2013 15:05:49 +0300 Message-Id: <1379937950-8411-22-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1379937950-8411-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1379937950-8411-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrea Arcangeli , Andrew Morton Cc: Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , Dave Hansen , Ning Qu , Alexander Shishkin , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" We are not ready to mmap file-backed tranparent huge pages. Let's split them on fault attempt. Later we'll implement mmap() properly and this code path be used for fallback cases. Signed-off-by: Kirill A. Shutemov --- mm/filemap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 9bbc024e4c..01a8f9945a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1736,6 +1736,8 @@ retry_find: goto no_cached_page; } + if (PageTransCompound(page)) + split_huge_page(compound_trans_head(page)); if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) { page_cache_release(page); return ret | VM_FAULT_RETRY; -- 1.8.4.rc3 -- 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